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Re: [PATCH] S390: Rename source files to *-linux-*.


On Wed, Oct 23 2013, Sergio Durigan Junior wrote:

> On Wednesday, October 23 2013, Andreas Arnez wrote:
>
> [...]
>> diff --git a/gdb/configure.host b/gdb/configure.host
>> index f522376..79c28d2 100644
>> --- a/gdb/configure.host
>> +++ b/gdb/configure.host
>> @@ -149,7 +149,7 @@ powerpc64*-*-linux*)	gdb_host=ppc64-linux
>>  			;;
>>  powerpc*-*-linux*)	gdb_host=linux ;;
>>  
>> -s390*-*-*)		gdb_host=s390 ;;
>> +s390*-*-*)		gdb_host=linux ;;
>
> Pedantically, maybe you should explicitly match "linux*", as powerpc
> does?

Done.

>
>>  
>>  sh*-*-netbsdelf* | sh*-*-knetbsd*-gnu)
>>  			gdb_host=nbsd ;;
>> diff --git a/gdb/configure.tgt b/gdb/configure.tgt
>> index ea0faf1..1329edb 100644
>> --- a/gdb/configure.tgt
>> +++ b/gdb/configure.tgt
>> @@ -466,7 +466,7 @@ powerpc*-*-*)
>>  
>>  s390*-*-*)
>
> Same here.

Done.

>
>>  	# Target: S390 running Linux
>> -	gdb_target_obs="s390-tdep.o solib-svr4.o linux-tdep.o"
>> +	gdb_target_obs="s390-linux-tdep.o solib-svr4.o linux-tdep.o"
>>  	build_gdbserver=yes
>>  	;;
>
> The rest is OK.
>
> Thanks,

Thanks for your review!


2013-10-24  Andreas Arnez  <arnez@linux.vnet.ibm.com>

	* s390-tdep.h: Rename to...
	* s390-linux-tdep.h: ...here.
	* s390-tdep.c: Rename to...
	* s390-linux-tdep.c: ...here.  Adjust #include.
	* s390-nat.c: Rename to...
	* s390-linux-nat.c: ...here.  Adjust #include.
	* config/s390/s390.mh: Rename to...
	* config/s390/linux.mh: ...here.  Reflect rename s390-nat.o ->
	s390-linux-nat.o.
	* configure.host: Reflect host rename "s390" -> "linux".
	* configure.tgt: Reflect rename s390-tdep.o -> s390-linux-tdep.o.
	* Makefile.in (ALL_TARGET_OBS): Likewise.
	(HFILES_NO_SRCDIR): Reflect rename s390-tdep.h ->
	s390-linux-tdep.h.
	(ALLDEPFILES): Reflect rename of .c files.
---
 gdb/Makefile.in          |    6 +-
 gdb/config/s390/linux.mh |    8 +
 gdb/config/s390/s390.mh  |    8 -
 gdb/configure.host       |    2 +-
 gdb/configure.tgt        |    4 +-
 gdb/s390-linux-nat.c     |  695 ++++++++++
 gdb/s390-linux-tdep.c    | 3390 ++++++++++++++++++++++++++++++++++++++++++++++
 gdb/s390-linux-tdep.h    |  178 +++
 gdb/s390-nat.c           |  695 ----------
 gdb/s390-tdep.c          | 3390 ----------------------------------------------
 gdb/s390-tdep.h          |  178 ---
 11 files changed, 4277 insertions(+), 4277 deletions(-)
 create mode 100644 gdb/config/s390/linux.mh
 delete mode 100644 gdb/config/s390/s390.mh
 create mode 100644 gdb/s390-linux-nat.c
 create mode 100644 gdb/s390-linux-tdep.c
 create mode 100644 gdb/s390-linux-tdep.h
 delete mode 100644 gdb/s390-nat.c
 delete mode 100644 gdb/s390-tdep.c
 delete mode 100644 gdb/s390-tdep.h

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index fc2a3af..a9b3c64 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -586,7 +586,7 @@ ALL_TARGET_OBS = \
 	rs6000-aix-tdep.o rs6000-tdep.o solib-aix.o ppc-ravenscar-thread.o \
 	rs6000-lynx178-tdep.o \
 	rx-tdep.o \
-	s390-tdep.o \
+	s390-linux-tdep.o \
 	score-tdep.o \
 	sh64-tdep.o sh-linux-tdep.o shnbsd-tdep.o sh-tdep.o \
 	sparc-linux-tdep.o sparcnbsd-tdep.o sparcobsd-tdep.o \
@@ -802,7 +802,7 @@ cli/cli-script.h macrotab.h symtab.h common/version.h \
 gnulib/import/string.in.h gnulib/import/str-two-way.h \
 gnulib/import/stdint.in.h remote.h remote-notif.h gdb.h sparc-nat.h \
 gdbthread.h dwarf2-frame.h dwarf2-frame-tailcall.h nbsd-nat.h dcache.h \
-amd64-nat.h s390-tdep.h arm-linux-tdep.h exceptions.h macroscope.h \
+amd64-nat.h s390-linux-tdep.h arm-linux-tdep.h exceptions.h macroscope.h \
 gdbarch.h bsd-uthread.h common/gdb_stat.h memory-map.h	memrange.h \
 mdebugread.h m88k-tdep.h stabsread.h hppa-linux-offsets.h linux-fork.h \
 ser-unix.h inf-ptrace.h terminal.h ui-out.h frame-base.h \
@@ -1551,7 +1551,7 @@ ALLDEPFILES = \
 	rs6000-nat.c rs6000-tdep.c solib-aix.c ppc-ravenscar-thread.c \
 	rs6000-lynx178-tdep.c \
 	rx-tdep.c \
-	s390-tdep.c s390-nat.c \
+	s390-linux-tdep.c s390-linux-nat.c \
 	score-tdep.c \
 	ser-go32.c ser-pipe.c ser-tcp.c ser-mingw.c \
 	sh-tdep.c sh64-tdep.c shnbsd-tdep.c shnbsd-nat.c \
diff --git a/gdb/config/s390/linux.mh b/gdb/config/s390/linux.mh
new file mode 100644
index 0000000..59bab83
--- /dev/null
+++ b/gdb/config/s390/linux.mh
@@ -0,0 +1,8 @@
+# Host: S390, running Linux
+NAT_FILE= config/nm-linux.h
+NATDEPFILES= inf-ptrace.o fork-child.o s390-linux-nat.o \
+	linux-thread-db.o proc-service.o \
+	linux-nat.o linux-osdata.o linux-fork.o linux-procfs.o linux-ptrace.o \
+	linux-waitpid.o
+NAT_CDEPS = $(srcdir)/proc-service.list
+LOADLIBES = -ldl $(RDYNAMIC)
diff --git a/gdb/config/s390/s390.mh b/gdb/config/s390/s390.mh
deleted file mode 100644
index 76d82e5..0000000
--- a/gdb/config/s390/s390.mh
+++ /dev/null
@@ -1,8 +0,0 @@
-# Host: S390, running Linux
-NAT_FILE= config/nm-linux.h
-NATDEPFILES= inf-ptrace.o fork-child.o s390-nat.o \
-	linux-thread-db.o proc-service.o \
-	linux-nat.o linux-osdata.o linux-fork.o linux-procfs.o linux-ptrace.o \
-	linux-waitpid.o
-NAT_CDEPS = $(srcdir)/proc-service.list
-LOADLIBES = -ldl $(RDYNAMIC)
diff --git a/gdb/configure.host b/gdb/configure.host
index f522376..634213f 100644
--- a/gdb/configure.host
+++ b/gdb/configure.host
@@ -149,7 +149,7 @@ powerpc64*-*-linux*)	gdb_host=ppc64-linux
 			;;
 powerpc*-*-linux*)	gdb_host=linux ;;
 
-s390*-*-*)		gdb_host=s390 ;;
+s390*-*-linux*)		gdb_host=linux ;;
 
 sh*-*-netbsdelf* | sh*-*-knetbsd*-gnu)
 			gdb_host=nbsd ;;
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index ea0faf1..47e98d9 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -464,9 +464,9 @@ powerpc*-*-*)
 	fi
 	;;
 
-s390*-*-*)
+s390*-*-linux*)
 	# Target: S390 running Linux
-	gdb_target_obs="s390-tdep.o solib-svr4.o linux-tdep.o"
+	gdb_target_obs="s390-linux-tdep.o solib-svr4.o linux-tdep.o"
 	build_gdbserver=yes
 	;;
 
diff --git a/gdb/s390-linux-nat.c b/gdb/s390-linux-nat.c
new file mode 100644
index 0000000..45602c0
--- /dev/null
+++ b/gdb/s390-linux-nat.c
@@ -0,0 +1,695 @@
+/* S390 native-dependent code for GDB, the GNU debugger.
+   Copyright (C) 2001-2013 Free Software Foundation, Inc.
+
+   Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+   for IBM Deutschland Entwicklung GmbH, IBM Corporation.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "regcache.h"
+#include "inferior.h"
+#include "target.h"
+#include "linux-nat.h"
+#include "auxv.h"
+#include "gregset.h"
+
+#include "s390-linux-tdep.h"
+#include "elf/common.h"
+
+#include <asm/ptrace.h>
+#include <sys/ptrace.h>
+#include <asm/types.h>
+#include <sys/procfs.h>
+#include <sys/ucontext.h>
+#include <elf.h>
+
+#ifndef PTRACE_GETREGSET
+#define PTRACE_GETREGSET 0x4204
+#endif
+
+#ifndef PTRACE_SETREGSET
+#define PTRACE_SETREGSET 0x4205
+#endif
+
+static int have_regset_last_break = 0;
+static int have_regset_system_call = 0;
+static int have_regset_tdb = 0;
+
+/* Map registers to gregset/ptrace offsets.
+   These arrays are defined in s390-tdep.c.  */
+
+#ifdef __s390x__
+#define regmap_gregset s390x_regmap_gregset
+#else
+#define regmap_gregset s390_regmap_gregset
+#endif
+
+#define regmap_fpregset s390_regmap_fpregset
+
+/* Fill the regset described by MAP into REGCACHE, using the values
+   from REGP.  The MAP array represents each register as a pair
+   (offset, regno) of short integers and is terminated with -1. */
+
+static void
+s390_native_supply (struct regcache *regcache, const short *map,
+		    const gdb_byte *regp)
+{
+  for (; map[0] >= 0; map += 2)
+    regcache_raw_supply (regcache, map[1], regp ? regp + map[0] : NULL);
+}
+
+/* Collect the register REGNO out of the regset described by MAP from
+   REGCACHE into REGP.  If REGNO == -1, do this for all registers in
+   this regset. */
+
+static void
+s390_native_collect (const struct regcache *regcache, const short *map,
+		     int regno, gdb_byte *regp)
+{
+  for (; map[0] >= 0; map += 2)
+    if (regno == -1 || regno == map[1])
+      regcache_raw_collect (regcache, map[1], regp + map[0]);
+}
+
+/* Fill GDB's register array with the general-purpose register values
+   in *REGP.
+
+   When debugging a 32-bit executable running under a 64-bit kernel,
+   we have to fix up the 64-bit registers we get from the kernel to
+   make them look like 32-bit registers.  */
+
+void
+supply_gregset (struct regcache *regcache, const gregset_t *regp)
+{
+#ifdef __s390x__
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  if (gdbarch_ptr_bit (gdbarch) == 32)
+    {
+      enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+      ULONGEST pswm = 0, pswa = 0;
+      gdb_byte buf[4];
+      const short *map;
+
+      for (map = regmap_gregset; map[0] >= 0; map += 2)
+	{
+	  const gdb_byte *p = (const gdb_byte *) regp + map[0];
+	  int regno = map[1];
+
+	  if (regno == S390_PSWM_REGNUM)
+	    pswm = extract_unsigned_integer (p, 8, byte_order);
+	  else if (regno == S390_PSWA_REGNUM)
+	    pswa = extract_unsigned_integer (p, 8, byte_order);
+	  else
+	    {
+	      if ((regno >= S390_R0_REGNUM && regno <= S390_R15_REGNUM)
+		  || regno == S390_ORIG_R2_REGNUM)
+		p += 4;
+	      regcache_raw_supply (regcache, regno, p);
+	    }
+	}
+
+      store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000);
+      regcache_raw_supply (regcache, S390_PSWM_REGNUM, buf);
+      store_unsigned_integer (buf, 4, byte_order,
+			      (pswa & 0x7fffffff) | (pswm & 0x80000000));
+      regcache_raw_supply (regcache, S390_PSWA_REGNUM, buf);
+      return;
+    }
+#endif
+
+  s390_native_supply (regcache, regmap_gregset, (const gdb_byte *) regp);
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+   *REGP with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+
+void
+fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
+{
+#ifdef __s390x__
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  if (gdbarch_ptr_bit (gdbarch) == 32)
+    {
+      gdb_byte *psw_p[2];
+      const short *map;
+
+      for (map = regmap_gregset; map[0] >= 0; map += 2)
+	{
+	  gdb_byte *p = (gdb_byte *) regp + map[0];
+	  int reg = map[1];
+
+	  if (reg >= S390_PSWM_REGNUM && reg <= S390_PSWA_REGNUM)
+	    psw_p[reg - S390_PSWM_REGNUM] = p;
+
+	  else if (regno == -1 || regno == reg)
+	    {
+	      if ((reg >= S390_R0_REGNUM && reg <= S390_R15_REGNUM)
+		  || reg == S390_ORIG_R2_REGNUM)
+		{
+		  memset (p, 0, 4);
+		  p += 4;
+		}
+	      regcache_raw_collect (regcache, reg, p + 4);
+	    }
+	}
+
+      if (regno == -1
+	  || regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM)
+	{
+	  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+	  ULONGEST pswa, pswm;
+	  gdb_byte buf[4];
+
+	  regcache_raw_collect (regcache, S390_PSWM_REGNUM, buf);
+	  pswm = extract_unsigned_integer (buf, 4, byte_order);
+	  regcache_raw_collect (regcache, S390_PSWA_REGNUM, buf);
+	  pswa = extract_unsigned_integer (buf, 4, byte_order);
+
+	  if (regno == -1 || regno == S390_PSWM_REGNUM)
+	    store_unsigned_integer (psw_p[0], 8, byte_order,
+				    ((pswm & 0xfff7ffff) << 32) |
+				    (pswa & 0x80000000));
+	  if (regno == -1 || regno == S390_PSWA_REGNUM)
+	    store_unsigned_integer (psw_p[1], 8, byte_order,
+				    pswa & 0x7fffffff);
+	}
+      return;
+    }
+#endif
+
+  s390_native_collect (regcache, regmap_gregset, regno, (gdb_byte *) regp);
+}
+
+/* Fill GDB's register array with the floating-point register values
+   in *REGP.  */
+void
+supply_fpregset (struct regcache *regcache, const fpregset_t *regp)
+{
+  s390_native_supply (regcache, regmap_fpregset, (const gdb_byte *) regp);
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+   *REGP with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+void
+fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno)
+{
+  s390_native_collect (regcache, regmap_fpregset, regno, (gdb_byte *) regp);
+}
+
+/* Find the TID for the current inferior thread to use with ptrace.  */
+static int
+s390_inferior_tid (void)
+{
+  /* GNU/Linux LWP ID's are process ID's.  */
+  int tid = ptid_get_lwp (inferior_ptid);
+  if (tid == 0)
+    tid = ptid_get_pid (inferior_ptid); /* Not a threaded program.  */
+
+  return tid;
+}
+
+/* Fetch all general-purpose registers from process/thread TID and
+   store their values in GDB's register cache.  */
+static void
+fetch_regs (struct regcache *regcache, int tid)
+{
+  gregset_t regs;
+  ptrace_area parea;
+
+  parea.len = sizeof (regs);
+  parea.process_addr = (addr_t) &regs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, psw);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name (_("Couldn't get registers"));
+
+  supply_gregset (regcache, (const gregset_t *) &regs);
+}
+
+/* Store all valid general-purpose registers in GDB's register cache
+   into the process/thread specified by TID.  */
+static void
+store_regs (const struct regcache *regcache, int tid, int regnum)
+{
+  gregset_t regs;
+  ptrace_area parea;
+
+  parea.len = sizeof (regs);
+  parea.process_addr = (addr_t) &regs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, psw);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name (_("Couldn't get registers"));
+
+  fill_gregset (regcache, &regs, regnum);
+
+  if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name (_("Couldn't write registers"));
+}
+
+/* Fetch all floating-point registers from process/thread TID and store
+   their values in GDB's register cache.  */
+static void
+fetch_fpregs (struct regcache *regcache, int tid)
+{
+  fpregset_t fpregs;
+  ptrace_area parea;
+
+  parea.len = sizeof (fpregs);
+  parea.process_addr = (addr_t) &fpregs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name (_("Couldn't get floating point status"));
+
+  supply_fpregset (regcache, (const fpregset_t *) &fpregs);
+}
+
+/* Store all valid floating-point registers in GDB's register cache
+   into the process/thread specified by TID.  */
+static void
+store_fpregs (const struct regcache *regcache, int tid, int regnum)
+{
+  fpregset_t fpregs;
+  ptrace_area parea;
+
+  parea.len = sizeof (fpregs);
+  parea.process_addr = (addr_t) &fpregs;
+  parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name (_("Couldn't get floating point status"));
+
+  fill_fpregset (regcache, &fpregs, regnum);
+
+  if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
+    perror_with_name (_("Couldn't write floating point status"));
+}
+
+/* Fetch all registers in the kernel's register set whose number is REGSET,
+   whose size is REGSIZE, and whose layout is described by REGMAP, from
+   process/thread TID and store their values in GDB's register cache.  */
+static void
+fetch_regset (struct regcache *regcache, int tid,
+	      int regset, int regsize, const short *regmap)
+{
+  gdb_byte *buf = alloca (regsize);
+  struct iovec iov;
+
+  iov.iov_base = buf;
+  iov.iov_len = regsize;
+
+  if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) < 0)
+    {
+      if (errno == ENODATA)
+	s390_native_supply (regcache, regmap, NULL);
+      else
+	perror_with_name (_("Couldn't get register set"));
+    }
+  else
+    s390_native_supply (regcache, regmap, buf);
+}
+
+/* Store all registers in the kernel's register set whose number is REGSET,
+   whose size is REGSIZE, and whose layout is described by REGMAP, from
+   GDB's register cache back to process/thread TID.  */
+static void
+store_regset (struct regcache *regcache, int tid,
+	      int regset, int regsize, const short *regmap)
+{
+  gdb_byte *buf = alloca (regsize);
+  struct iovec iov;
+
+  iov.iov_base = buf;
+  iov.iov_len = regsize;
+
+  if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) < 0)
+    perror_with_name (_("Couldn't get register set"));
+
+  s390_native_collect (regcache, regmap, -1, buf);
+
+  if (ptrace (PTRACE_SETREGSET, tid, (long) regset, (long) &iov) < 0)
+    perror_with_name (_("Couldn't set register set"));
+}
+
+/* Check whether the kernel provides a register set with number REGSET
+   of size REGSIZE for process/thread TID.  */
+static int
+check_regset (int tid, int regset, int regsize)
+{
+  gdb_byte *buf = alloca (regsize);
+  struct iovec iov;
+
+  iov.iov_base = buf;
+  iov.iov_len = regsize;
+
+  if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0
+      || errno == ENODATA)
+    return 1;
+  return 0;
+}
+
+/* Fetch register REGNUM from the child process.  If REGNUM is -1, do
+   this for all registers.  */
+static void
+s390_linux_fetch_inferior_registers (struct target_ops *ops,
+				     struct regcache *regcache, int regnum)
+{
+  int tid = s390_inferior_tid ();
+
+  if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
+    fetch_regs (regcache, tid);
+
+  if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
+    fetch_fpregs (regcache, tid);
+
+  if (have_regset_last_break)
+    if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM)
+      fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8,
+		    (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32
+		     ? s390_regmap_last_break : s390x_regmap_last_break));
+
+  if (have_regset_system_call)
+    if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
+      fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
+		    s390_regmap_system_call);
+
+  if (have_regset_tdb)
+    if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum))
+      fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset,
+		    s390_regmap_tdb);
+}
+
+/* Store register REGNUM back into the child process.  If REGNUM is
+   -1, do this for all registers.  */
+static void
+s390_linux_store_inferior_registers (struct target_ops *ops,
+				     struct regcache *regcache, int regnum)
+{
+  int tid = s390_inferior_tid ();
+
+  if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
+    store_regs (regcache, tid, regnum);
+
+  if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
+    store_fpregs (regcache, tid, regnum);
+
+  /* S390_LAST_BREAK_REGNUM is read-only.  */
+
+  if (have_regset_system_call)
+    if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
+      store_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
+		    s390_regmap_system_call);
+}
+
+
+/* Hardware-assisted watchpoint handling.  */
+
+/* We maintain a list of all currently active watchpoints in order
+   to properly handle watchpoint removal.
+
+   The only thing we actually need is the total address space area
+   spanned by the watchpoints.  */
+
+struct watch_area
+{
+  struct watch_area *next;
+  CORE_ADDR lo_addr;
+  CORE_ADDR hi_addr;
+};
+
+static struct watch_area *watch_base = NULL;
+
+static int
+s390_stopped_by_watchpoint (void)
+{
+  per_lowcore_bits per_lowcore;
+  ptrace_area parea;
+  int result;
+
+  /* Speed up common case.  */
+  if (!watch_base)
+    return 0;
+
+  parea.len = sizeof (per_lowcore);
+  parea.process_addr = (addr_t) & per_lowcore;
+  parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
+  if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0)
+    perror_with_name (_("Couldn't retrieve watchpoint status"));
+
+  result = (per_lowcore.perc_storage_alteration == 1
+	    && per_lowcore.perc_store_real_address == 0);
+
+  if (result)
+    {
+      /* Do not report this watchpoint again.  */
+      memset (&per_lowcore, 0, sizeof (per_lowcore));
+      if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0)
+	perror_with_name (_("Couldn't clear watchpoint status"));
+    }
+
+  return result;
+}
+
+static void
+s390_fix_watch_points (struct lwp_info *lp)
+{
+  int tid;
+
+  per_struct per_info;
+  ptrace_area parea;
+
+  CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0;
+  struct watch_area *area;
+
+  tid = ptid_get_lwp (lp->ptid);
+  if (tid == 0)
+    tid = ptid_get_pid (lp->ptid);
+
+  for (area = watch_base; area; area = area->next)
+    {
+      watch_lo_addr = min (watch_lo_addr, area->lo_addr);
+      watch_hi_addr = max (watch_hi_addr, area->hi_addr);
+    }
+
+  parea.len = sizeof (per_info);
+  parea.process_addr = (addr_t) & per_info;
+  parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
+  if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0)
+    perror_with_name (_("Couldn't retrieve watchpoint status"));
+
+  if (watch_base)
+    {
+      per_info.control_regs.bits.em_storage_alteration = 1;
+      per_info.control_regs.bits.storage_alt_space_ctl = 1;
+    }
+  else
+    {
+      per_info.control_regs.bits.em_storage_alteration = 0;
+      per_info.control_regs.bits.storage_alt_space_ctl = 0;
+    }
+  per_info.starting_addr = watch_lo_addr;
+  per_info.ending_addr = watch_hi_addr;
+
+  if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0)
+    perror_with_name (_("Couldn't modify watchpoint status"));
+}
+
+static int
+s390_insert_watchpoint (CORE_ADDR addr, int len, int type,
+			struct expression *cond)
+{
+  struct lwp_info *lp;
+  struct watch_area *area = xmalloc (sizeof (struct watch_area));
+
+  if (!area)
+    return -1; 
+
+  area->lo_addr = addr;
+  area->hi_addr = addr + len - 1;
+ 
+  area->next = watch_base;
+  watch_base = area;
+
+  ALL_LWPS (lp)
+    s390_fix_watch_points (lp);
+  return 0;
+}
+
+static int
+s390_remove_watchpoint (CORE_ADDR addr, int len, int type,
+			struct expression *cond)
+{
+  struct lwp_info *lp;
+  struct watch_area *area, **parea;
+
+  for (parea = &watch_base; *parea; parea = &(*parea)->next)
+    if ((*parea)->lo_addr == addr
+	&& (*parea)->hi_addr == addr + len - 1)
+      break;
+
+  if (!*parea)
+    {
+      fprintf_unfiltered (gdb_stderr,
+			  "Attempt to remove nonexistent watchpoint.\n");
+      return -1;
+    }
+
+  area = *parea;
+  *parea = area->next;
+  xfree (area);
+
+  ALL_LWPS (lp)
+    s390_fix_watch_points (lp);
+  return 0;
+}
+
+static int
+s390_can_use_hw_breakpoint (int type, int cnt, int othertype)
+{
+  return type == bp_hardware_watchpoint;
+}
+
+static int
+s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
+{
+  return 1;
+}
+
+static int
+s390_target_wordsize (void)
+{
+  int wordsize = 4;
+
+  /* Check for 64-bit inferior process.  This is the case when the host is
+     64-bit, and in addition bit 32 of the PSW mask is set.  */
+#ifdef __s390x__
+  long pswm;
+
+  errno = 0;
+  pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0);
+  if (errno == 0 && (pswm & 0x100000000ul) != 0)
+    wordsize = 8;
+#endif
+
+  return wordsize;
+}
+
+static int
+s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
+		 gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
+{
+  int sizeof_auxv_field = s390_target_wordsize ();
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
+  gdb_byte *ptr = *readptr;
+
+  if (endptr == ptr)
+    return 0;
+
+  if (endptr - ptr < sizeof_auxv_field * 2)
+    return -1;
+
+  *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
+  ptr += sizeof_auxv_field;
+  *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
+  ptr += sizeof_auxv_field;
+
+  *readptr = ptr;
+  return 1;
+}
+
+#ifdef __s390x__
+static unsigned long
+s390_get_hwcap (void)
+{
+  CORE_ADDR field;
+
+  if (target_auxv_search (&current_target, AT_HWCAP, &field))
+    return (unsigned long) field;
+
+  return 0;
+}
+#endif
+
+static const struct target_desc *
+s390_read_description (struct target_ops *ops)
+{
+  int tid = s390_inferior_tid ();
+
+  have_regset_last_break
+    = check_regset (tid, NT_S390_LAST_BREAK, 8);
+  have_regset_system_call
+    = check_regset (tid, NT_S390_SYSTEM_CALL, 4);
+  have_regset_tdb
+    = check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset);
+
+#ifdef __s390x__
+  /* If GDB itself is compiled as 64-bit, we are running on a machine in
+     z/Architecture mode.  If the target is running in 64-bit addressing
+     mode, report s390x architecture.  If the target is running in 31-bit
+     addressing mode, but the kernel supports using 64-bit registers in
+     that mode, report s390 architecture with 64-bit GPRs.  */
+
+  if (s390_target_wordsize () == 8)
+    return (have_regset_tdb ? tdesc_s390x_te_linux64 :
+	    have_regset_system_call? tdesc_s390x_linux64v2 :
+	    have_regset_last_break? tdesc_s390x_linux64v1 :
+	    tdesc_s390x_linux64);
+
+  if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
+    return (have_regset_tdb ? tdesc_s390_te_linux64 :
+	    have_regset_system_call? tdesc_s390_linux64v2 :
+	    have_regset_last_break? tdesc_s390_linux64v1 :
+	    tdesc_s390_linux64);
+#endif
+
+  /* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior
+     on a 64-bit kernel that does not support using 64-bit registers in 31-bit
+     mode, report s390 architecture with 32-bit GPRs.  */
+  return (have_regset_system_call? tdesc_s390_linux32v2 :
+	  have_regset_last_break? tdesc_s390_linux32v1 :
+	  tdesc_s390_linux32);
+}
+
+void _initialize_s390_nat (void);
+
+void
+_initialize_s390_nat (void)
+{
+  struct target_ops *t;
+
+  /* Fill in the generic GNU/Linux methods.  */
+  t = linux_target ();
+
+  /* Add our register access methods.  */
+  t->to_fetch_registers = s390_linux_fetch_inferior_registers;
+  t->to_store_registers = s390_linux_store_inferior_registers;
+
+  /* Add our watchpoint methods.  */
+  t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint;
+  t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint;
+  t->to_have_continuable_watchpoint = 1;
+  t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint;
+  t->to_insert_watchpoint = s390_insert_watchpoint;
+  t->to_remove_watchpoint = s390_remove_watchpoint;
+
+  /* Detect target architecture.  */
+  t->to_read_description = s390_read_description;
+  t->to_auxv_parse = s390_auxv_parse;
+
+  /* Register the target.  */
+  linux_nat_add_target (t);
+  linux_nat_set_new_thread (t, s390_fix_watch_points);
+}
diff --git a/gdb/s390-linux-tdep.c b/gdb/s390-linux-tdep.c
new file mode 100644
index 0000000..c3b711e
--- /dev/null
+++ b/gdb/s390-linux-tdep.c
@@ -0,0 +1,3390 @@
+/* Target-dependent code for GDB, the GNU debugger.
+
+   Copyright (C) 2001-2013 Free Software Foundation, Inc.
+
+   Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+   for IBM Deutschland Entwicklung GmbH, IBM Corporation.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "arch-utils.h"
+#include "frame.h"
+#include "inferior.h"
+#include "symtab.h"
+#include "target.h"
+#include "gdbcore.h"
+#include "gdbcmd.h"
+#include "objfiles.h"
+#include "floatformat.h"
+#include "regcache.h"
+#include "trad-frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "dwarf2-frame.h"
+#include "reggroups.h"
+#include "regset.h"
+#include "value.h"
+#include "gdb_assert.h"
+#include "dis-asm.h"
+#include "solib-svr4.h"
+#include "prologue-value.h"
+#include "linux-tdep.h"
+#include "s390-linux-tdep.h"
+#include "auxv.h"
+
+#include "stap-probe.h"
+#include "ax.h"
+#include "ax-gdb.h"
+#include "user-regs.h"
+#include "cli/cli-utils.h"
+#include <ctype.h>
+#include "elf/common.h"
+
+#include "features/s390-linux32.c"
+#include "features/s390-linux32v1.c"
+#include "features/s390-linux32v2.c"
+#include "features/s390-linux64.c"
+#include "features/s390-linux64v1.c"
+#include "features/s390-linux64v2.c"
+#include "features/s390-te-linux64.c"
+#include "features/s390x-linux64.c"
+#include "features/s390x-linux64v1.c"
+#include "features/s390x-linux64v2.c"
+#include "features/s390x-te-linux64.c"
+
+/* The tdep structure.  */
+
+struct gdbarch_tdep
+{
+  /* ABI version.  */
+  enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
+
+  /* Pseudo register numbers.  */
+  int gpr_full_regnum;
+  int pc_regnum;
+  int cc_regnum;
+
+  /* Core file register sets.  */
+  const struct regset *gregset;
+  int sizeof_gregset;
+
+  const struct regset *fpregset;
+  int sizeof_fpregset;
+};
+
+
+/* ABI call-saved register information.  */
+
+static int
+s390_register_call_saved (struct gdbarch *gdbarch, int regnum)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  switch (tdep->abi)
+    {
+    case ABI_LINUX_S390:
+      if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+	  || regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM
+	  || regnum == S390_A0_REGNUM)
+	return 1;
+
+      break;
+
+    case ABI_LINUX_ZSERIES:
+      if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+	  || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)
+	  || (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))
+	return 1;
+
+      break;
+    }
+
+  return 0;
+}
+
+static int
+s390_cannot_store_register (struct gdbarch *gdbarch, int regnum)
+{
+  /* The last-break address is read-only.  */
+  return regnum == S390_LAST_BREAK_REGNUM;
+}
+
+static void
+s390_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
+
+  /* Set special SYSTEM_CALL register to 0 to prevent the kernel from
+     messing with the PC we just installed, if we happen to be within
+     an interrupted system call that the kernel wants to restart.
+
+     Note that after we return from the dummy call, the SYSTEM_CALL and
+     ORIG_R2 registers will be automatically restored, and the kernel
+     continues to restart the system call at this point.  */
+  if (register_size (gdbarch, S390_SYSTEM_CALL_REGNUM) > 0)
+    regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);
+}
+
+
+/* DWARF Register Mapping.  */
+
+static const short s390_dwarf_regmap[] =
+{
+  /* General Purpose Registers.  */
+  S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+  S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+  S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+  S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
+
+  /* Floating Point Registers.  */
+  S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
+  S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
+  S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
+  S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
+
+  /* Control Registers (not mapped).  */
+  -1, -1, -1, -1, -1, -1, -1, -1, 
+  -1, -1, -1, -1, -1, -1, -1, -1, 
+
+  /* Access Registers.  */
+  S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
+  S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
+  S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
+  S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
+
+  /* Program Status Word.  */
+  S390_PSWM_REGNUM,
+  S390_PSWA_REGNUM,
+
+  /* GPR Lower Half Access.  */
+  S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+  S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+  S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+  S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
+
+  /* GNU/Linux-specific registers (not mapped).  */
+  -1, -1, -1,
+};
+
+/* Convert DWARF register number REG to the appropriate register
+   number used by GDB.  */
+static int
+s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* In a 32-on-64 debug scenario, debug info refers to the full 64-bit
+     GPRs.  Note that call frame information still refers to the 32-bit
+     lower halves, because s390_adjust_frame_regnum uses register numbers
+     66 .. 81 to access GPRs.  */
+  if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
+    return tdep->gpr_full_regnum + reg;
+
+  if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
+    return s390_dwarf_regmap[reg];
+
+  warning (_("Unmapped DWARF Register #%d encountered."), reg);
+  return -1;
+}
+
+/* Translate a .eh_frame register to DWARF register, or adjust a
+   .debug_frame register.  */
+static int
+s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
+{
+  /* See s390_dwarf_reg_to_regnum for comments.  */
+  return (num >= 0 && num < 16)? num + 66 : num;
+}
+
+
+/* Pseudo registers.  */
+
+static int
+regnum_is_gpr_full (struct gdbarch_tdep *tdep, int regnum)
+{
+  return (tdep->gpr_full_regnum != -1
+	  && regnum >= tdep->gpr_full_regnum
+	  && regnum <= tdep->gpr_full_regnum + 15);
+}
+
+static const char *
+s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (regnum == tdep->pc_regnum)
+    return "pc";
+
+  if (regnum == tdep->cc_regnum)
+    return "cc";
+
+  if (regnum_is_gpr_full (tdep, regnum))
+    {
+      static const char *full_name[] = {
+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
+      };
+      return full_name[regnum - tdep->gpr_full_regnum];
+    }
+
+  internal_error (__FILE__, __LINE__, _("invalid regnum"));
+}
+
+static struct type *
+s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (regnum == tdep->pc_regnum)
+    return builtin_type (gdbarch)->builtin_func_ptr;
+
+  if (regnum == tdep->cc_regnum)
+    return builtin_type (gdbarch)->builtin_int;
+
+  if (regnum_is_gpr_full (tdep, regnum))
+    return builtin_type (gdbarch)->builtin_uint64;
+
+  internal_error (__FILE__, __LINE__, _("invalid regnum"));
+}
+
+static enum register_status
+s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+			   int regnum, gdb_byte *buf)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  int regsize = register_size (gdbarch, regnum);
+  ULONGEST val;
+
+  if (regnum == tdep->pc_regnum)
+    {
+      enum register_status status;
+
+      status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+      if (status == REG_VALID)
+	{
+	  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+	    val &= 0x7fffffff;
+	  store_unsigned_integer (buf, regsize, byte_order, val);
+	}
+      return status;
+    }
+
+  if (regnum == tdep->cc_regnum)
+    {
+      enum register_status status;
+
+      status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+      if (status == REG_VALID)
+	{
+	  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+	    val = (val >> 12) & 3;
+	  else
+	    val = (val >> 44) & 3;
+	  store_unsigned_integer (buf, regsize, byte_order, val);
+	}
+      return status;
+    }
+
+  if (regnum_is_gpr_full (tdep, regnum))
+    {
+      enum register_status status;
+      ULONGEST val_upper;
+
+      regnum -= tdep->gpr_full_regnum;
+
+      status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
+      if (status == REG_VALID)
+	status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
+					     &val_upper);
+      if (status == REG_VALID)
+	{
+	  val |= val_upper << 32;
+	  store_unsigned_integer (buf, regsize, byte_order, val);
+	}
+      return status;
+    }
+
+  internal_error (__FILE__, __LINE__, _("invalid regnum"));
+}
+
+static void
+s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+			    int regnum, const gdb_byte *buf)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  int regsize = register_size (gdbarch, regnum);
+  ULONGEST val, psw;
+
+  if (regnum == tdep->pc_regnum)
+    {
+      val = extract_unsigned_integer (buf, regsize, byte_order);
+      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+	{
+	  regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
+	  val = (psw & 0x80000000) | (val & 0x7fffffff);
+	}
+      regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);
+      return;
+    }
+
+  if (regnum == tdep->cc_regnum)
+    {
+      val = extract_unsigned_integer (buf, regsize, byte_order);
+      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+	val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
+      else
+	val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
+      regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);
+      return;
+    }
+
+  if (regnum_is_gpr_full (tdep, regnum))
+    {
+      regnum -= tdep->gpr_full_regnum;
+      val = extract_unsigned_integer (buf, regsize, byte_order);
+      regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,
+				   val & 0xffffffff);
+      regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
+				   val >> 32);
+      return;
+    }
+
+  internal_error (__FILE__, __LINE__, _("invalid regnum"));
+}
+
+/* 'float' values are stored in the upper half of floating-point
+   registers, even though we are otherwise a big-endian platform.  */
+
+static struct value *
+s390_value_from_register (struct type *type, int regnum,
+			  struct frame_info *frame)
+{
+  struct value *value = default_value_from_register (type, regnum, frame);
+
+  check_typedef (type);
+
+  if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
+      && TYPE_LENGTH (type) < 8)
+    set_value_offset (value, 0);
+
+  return value;
+}
+
+/* Register groups.  */
+
+static int
+s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+				 struct reggroup *group)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* We usually save/restore the whole PSW, which includes PC and CC.
+     However, some older gdbservers may not support saving/restoring
+     the whole PSW yet, and will return an XML register description
+     excluding those from the save/restore register groups.  In those
+     cases, we still need to explicitly save/restore PC and CC in order
+     to push or pop frames.  Since this doesn't hurt anything if we
+     already save/restore the whole PSW (it's just redundant), we add
+     PC and CC at this point unconditionally.  */
+  if (group == save_reggroup || group == restore_reggroup)
+    return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;
+
+  return default_register_reggroup_p (gdbarch, regnum, group);
+}
+
+
+/* Maps for register sets.  */
+
+const short s390_regmap_gregset[] =
+  {
+    0x00, S390_PSWM_REGNUM,
+    0x04, S390_PSWA_REGNUM,
+    0x08, S390_R0_REGNUM,
+    0x0c, S390_R1_REGNUM,
+    0x10, S390_R2_REGNUM,
+    0x14, S390_R3_REGNUM,
+    0x18, S390_R4_REGNUM,
+    0x1c, S390_R5_REGNUM,
+    0x20, S390_R6_REGNUM,
+    0x24, S390_R7_REGNUM,
+    0x28, S390_R8_REGNUM,
+    0x2c, S390_R9_REGNUM,
+    0x30, S390_R10_REGNUM,
+    0x34, S390_R11_REGNUM,
+    0x38, S390_R12_REGNUM,
+    0x3c, S390_R13_REGNUM,
+    0x40, S390_R14_REGNUM,
+    0x44, S390_R15_REGNUM,
+    0x48, S390_A0_REGNUM,
+    0x4c, S390_A1_REGNUM,
+    0x50, S390_A2_REGNUM,
+    0x54, S390_A3_REGNUM,
+    0x58, S390_A4_REGNUM,
+    0x5c, S390_A5_REGNUM,
+    0x60, S390_A6_REGNUM,
+    0x64, S390_A7_REGNUM,
+    0x68, S390_A8_REGNUM,
+    0x6c, S390_A9_REGNUM,
+    0x70, S390_A10_REGNUM,
+    0x74, S390_A11_REGNUM,
+    0x78, S390_A12_REGNUM,
+    0x7c, S390_A13_REGNUM,
+    0x80, S390_A14_REGNUM,
+    0x84, S390_A15_REGNUM,
+    0x88, S390_ORIG_R2_REGNUM,
+    -1, -1
+  };
+
+const short s390x_regmap_gregset[] =
+  {
+    0x00, S390_PSWM_REGNUM,
+    0x08, S390_PSWA_REGNUM,
+    0x10, S390_R0_REGNUM,
+    0x18, S390_R1_REGNUM,
+    0x20, S390_R2_REGNUM,
+    0x28, S390_R3_REGNUM,
+    0x30, S390_R4_REGNUM,
+    0x38, S390_R5_REGNUM,
+    0x40, S390_R6_REGNUM,
+    0x48, S390_R7_REGNUM,
+    0x50, S390_R8_REGNUM,
+    0x58, S390_R9_REGNUM,
+    0x60, S390_R10_REGNUM,
+    0x68, S390_R11_REGNUM,
+    0x70, S390_R12_REGNUM,
+    0x78, S390_R13_REGNUM,
+    0x80, S390_R14_REGNUM,
+    0x88, S390_R15_REGNUM,
+    0x90, S390_A0_REGNUM,
+    0x94, S390_A1_REGNUM,
+    0x98, S390_A2_REGNUM,
+    0x9c, S390_A3_REGNUM,
+    0xa0, S390_A4_REGNUM,
+    0xa4, S390_A5_REGNUM,
+    0xa8, S390_A6_REGNUM,
+    0xac, S390_A7_REGNUM,
+    0xb0, S390_A8_REGNUM,
+    0xb4, S390_A9_REGNUM,
+    0xb8, S390_A10_REGNUM,
+    0xbc, S390_A11_REGNUM,
+    0xc0, S390_A12_REGNUM,
+    0xc4, S390_A13_REGNUM,
+    0xc8, S390_A14_REGNUM,
+    0xcc, S390_A15_REGNUM,
+    0x10, S390_R0_UPPER_REGNUM,
+    0x18, S390_R1_UPPER_REGNUM,
+    0x20, S390_R2_UPPER_REGNUM,
+    0x28, S390_R3_UPPER_REGNUM,
+    0x30, S390_R4_UPPER_REGNUM,
+    0x38, S390_R5_UPPER_REGNUM,
+    0x40, S390_R6_UPPER_REGNUM,
+    0x48, S390_R7_UPPER_REGNUM,
+    0x50, S390_R8_UPPER_REGNUM,
+    0x58, S390_R9_UPPER_REGNUM,
+    0x60, S390_R10_UPPER_REGNUM,
+    0x68, S390_R11_UPPER_REGNUM,
+    0x70, S390_R12_UPPER_REGNUM,
+    0x78, S390_R13_UPPER_REGNUM,
+    0x80, S390_R14_UPPER_REGNUM,
+    0x88, S390_R15_UPPER_REGNUM,
+    0xd0, S390_ORIG_R2_REGNUM,
+    -1, -1
+  };
+
+const short s390_regmap_fpregset[] =
+  {
+    0x00, S390_FPC_REGNUM,
+    0x08, S390_F0_REGNUM,
+    0x10, S390_F1_REGNUM,
+    0x18, S390_F2_REGNUM,
+    0x20, S390_F3_REGNUM,
+    0x28, S390_F4_REGNUM,
+    0x30, S390_F5_REGNUM,
+    0x38, S390_F6_REGNUM,
+    0x40, S390_F7_REGNUM,
+    0x48, S390_F8_REGNUM,
+    0x50, S390_F9_REGNUM,
+    0x58, S390_F10_REGNUM,
+    0x60, S390_F11_REGNUM,
+    0x68, S390_F12_REGNUM,
+    0x70, S390_F13_REGNUM,
+    0x78, S390_F14_REGNUM,
+    0x80, S390_F15_REGNUM,
+    -1, -1
+  };
+
+const short s390_regmap_upper[] =
+  {
+    0x00, S390_R0_UPPER_REGNUM,
+    0x04, S390_R1_UPPER_REGNUM,
+    0x08, S390_R2_UPPER_REGNUM,
+    0x0c, S390_R3_UPPER_REGNUM,
+    0x10, S390_R4_UPPER_REGNUM,
+    0x14, S390_R5_UPPER_REGNUM,
+    0x18, S390_R6_UPPER_REGNUM,
+    0x1c, S390_R7_UPPER_REGNUM,
+    0x20, S390_R8_UPPER_REGNUM,
+    0x24, S390_R9_UPPER_REGNUM,
+    0x28, S390_R10_UPPER_REGNUM,
+    0x2c, S390_R11_UPPER_REGNUM,
+    0x30, S390_R12_UPPER_REGNUM,
+    0x34, S390_R13_UPPER_REGNUM,
+    0x38, S390_R14_UPPER_REGNUM,
+    0x3c, S390_R15_UPPER_REGNUM,
+    -1, -1
+  };
+
+const short s390_regmap_last_break[] =
+  {
+    0x04, S390_LAST_BREAK_REGNUM,
+    -1, -1
+  };
+
+const short s390x_regmap_last_break[] =
+  {
+    0x00, S390_LAST_BREAK_REGNUM,
+    -1, -1
+  };
+
+const short s390_regmap_system_call[] =
+  {
+    0x00, S390_SYSTEM_CALL_REGNUM,
+    -1, -1
+  };
+
+const short s390_regmap_tdb[] =
+  {
+    0x00, S390_TDB_DWORD0_REGNUM,
+    0x08, S390_TDB_ABORT_CODE_REGNUM,
+    0x10, S390_TDB_CONFLICT_TOKEN_REGNUM,
+    0x18, S390_TDB_ATIA_REGNUM,
+    0x80, S390_TDB_R0_REGNUM,
+    0x88, S390_TDB_R1_REGNUM,
+    0x90, S390_TDB_R2_REGNUM,
+    0x98, S390_TDB_R3_REGNUM,
+    0xa0, S390_TDB_R4_REGNUM,
+    0xa8, S390_TDB_R5_REGNUM,
+    0xb0, S390_TDB_R6_REGNUM,
+    0xb8, S390_TDB_R7_REGNUM,
+    0xc0, S390_TDB_R8_REGNUM,
+    0xc8, S390_TDB_R9_REGNUM,
+    0xd0, S390_TDB_R10_REGNUM,
+    0xd8, S390_TDB_R11_REGNUM,
+    0xe0, S390_TDB_R12_REGNUM,
+    0xe8, S390_TDB_R13_REGNUM,
+    0xf0, S390_TDB_R14_REGNUM,
+    0xf8, S390_TDB_R15_REGNUM,
+    -1, -1
+  };
+
+
+/* Supply register REGNUM from the register set REGSET to register cache 
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+static void
+s390_supply_regset (const struct regset *regset, struct regcache *regcache,
+		    int regnum, const void *regs, size_t len)
+{
+  const short *map;
+  for (map = regset->descr; map[0] >= 0; map += 2)
+    if (regnum == -1 || regnum == map[1])
+      regcache_raw_supply (regcache, map[1],
+			   regs ? (const char *)regs + map[0] : NULL);
+}
+
+/* Supply the TDB regset.  Like s390_supply_regset, but invalidate the
+   TDB registers unless the TDB format field is valid.  */
+
+static void
+s390_supply_tdb_regset (const struct regset *regset, struct regcache *regcache,
+		    int regnum, const void *regs, size_t len)
+{
+  ULONGEST tdw;
+  enum register_status ret;
+  int i;
+
+  s390_supply_regset (regset, regcache, regnum, regs, len);
+  ret = regcache_cooked_read_unsigned (regcache, S390_TDB_DWORD0_REGNUM, &tdw);
+  if (ret != REG_VALID || (tdw >> 56) != 1)
+    s390_supply_regset (regset, regcache, regnum, NULL, len);
+}
+
+/* Collect register REGNUM from the register cache REGCACHE and store
+   it in the buffer specified by REGS and LEN as described by the
+   general-purpose register set REGSET.  If REGNUM is -1, do this for
+   all registers in REGSET.  */
+static void
+s390_collect_regset (const struct regset *regset,
+		     const struct regcache *regcache,
+		     int regnum, void *regs, size_t len)
+{
+  const short *map;
+  for (map = regset->descr; map[0] >= 0; map += 2)
+    if (regnum == -1 || regnum == map[1])
+      regcache_raw_collect (regcache, map[1], (char *)regs + map[0]);
+}
+
+static const struct regset s390_gregset = {
+  s390_regmap_gregset, 
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390x_gregset = {
+  s390x_regmap_gregset, 
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390_fpregset = {
+  s390_regmap_fpregset, 
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390_upper_regset = {
+  s390_regmap_upper, 
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390_last_break_regset = {
+  s390_regmap_last_break,
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390x_last_break_regset = {
+  s390x_regmap_last_break,
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390_system_call_regset = {
+  s390_regmap_system_call,
+  s390_supply_regset,
+  s390_collect_regset
+};
+
+static const struct regset s390_tdb_regset = {
+  s390_regmap_tdb,
+  s390_supply_tdb_regset,
+  s390_collect_regset
+};
+
+static struct core_regset_section s390_linux32_regset_sections[] =
+{
+  { ".reg", s390_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390_linux32v1_regset_sections[] =
+{
+  { ".reg", s390_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-last-break", 8, "s390 last-break address" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390_linux32v2_regset_sections[] =
+{
+  { ".reg", s390_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-last-break", 8, "s390 last-break address" },
+  { ".reg-s390-system-call", 4, "s390 system-call" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390_linux64_regset_sections[] =
+{
+  { ".reg", s390_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390_linux64v1_regset_sections[] =
+{
+  { ".reg", s390_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
+  { ".reg-s390-last-break", 8, "s930 last-break address" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390_linux64v2_regset_sections[] =
+{
+  { ".reg", s390_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
+  { ".reg-s390-last-break", 8, "s930 last-break address" },
+  { ".reg-s390-system-call", 4, "s390 system-call" },
+  { ".reg-s390-tdb", s390_sizeof_tdbregset, "s390 TDB" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390x_linux64_regset_sections[] =
+{
+  { ".reg", s390x_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390x_linux64v1_regset_sections[] =
+{
+  { ".reg", s390x_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-last-break", 8, "s930 last-break address" },
+  { NULL, 0}
+};
+
+static struct core_regset_section s390x_linux64v2_regset_sections[] =
+{
+  { ".reg", s390x_sizeof_gregset, "general-purpose" },
+  { ".reg2", s390_sizeof_fpregset, "floating-point" },
+  { ".reg-s390-last-break", 8, "s930 last-break address" },
+  { ".reg-s390-system-call", 4, "s390 system-call" },
+  { ".reg-s390-tdb", s390_sizeof_tdbregset, "s390 TDB" },
+  { NULL, 0}
+};
+
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+static const struct regset *
+s390_regset_from_core_section (struct gdbarch *gdbarch,
+			       const char *sect_name, size_t sect_size)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)
+    return tdep->gregset;
+
+  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)
+    return tdep->fpregset;
+
+  if (strcmp (sect_name, ".reg-s390-high-gprs") == 0 && sect_size >= 16*4)
+    return &s390_upper_regset;
+
+  if (strcmp (sect_name, ".reg-s390-last-break") == 0 && sect_size >= 8)
+    return (gdbarch_ptr_bit (gdbarch) == 32
+	    ?  &s390_last_break_regset : &s390x_last_break_regset);
+
+  if (strcmp (sect_name, ".reg-s390-system-call") == 0 && sect_size >= 4)
+    return &s390_system_call_regset;
+
+  if (strcmp (sect_name, ".reg-s390-tdb") == 0 && sect_size >= 256)
+    return &s390_tdb_regset;
+
+  return NULL;
+}
+
+static const struct target_desc *
+s390_core_read_description (struct gdbarch *gdbarch,
+			    struct target_ops *target, bfd *abfd)
+{
+  asection *high_gprs = bfd_get_section_by_name (abfd, ".reg-s390-high-gprs");
+  asection *v1 = bfd_get_section_by_name (abfd, ".reg-s390-last-break");
+  asection *v2 = bfd_get_section_by_name (abfd, ".reg-s390-system-call");
+  asection *section = bfd_get_section_by_name (abfd, ".reg");
+  CORE_ADDR hwcap = 0;
+
+  target_auxv_search (target, AT_HWCAP, &hwcap);
+  if (!section)
+    return NULL;
+
+  switch (bfd_section_size (abfd, section))
+    {
+    case s390_sizeof_gregset:
+      if (high_gprs)
+	return ((hwcap & HWCAP_S390_TE) ? tdesc_s390_te_linux64 :
+		v2? tdesc_s390_linux64v2 :
+		v1? tdesc_s390_linux64v1 : tdesc_s390_linux64);
+      else
+	return (v2? tdesc_s390_linux32v2 :
+		v1? tdesc_s390_linux32v1 : tdesc_s390_linux32);
+
+    case s390x_sizeof_gregset:
+      return ((hwcap & HWCAP_S390_TE) ? tdesc_s390x_te_linux64 :
+	      v2? tdesc_s390x_linux64v2 :
+	      v1? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);
+
+    default:
+      return NULL;
+    }
+}
+
+
+/* Decoding S/390 instructions.  */
+
+/* Named opcode values for the S/390 instructions we recognize.  Some
+   instructions have their opcode split across two fields; those are the
+   op1_* and op2_* enums.  */
+enum
+  {
+    op1_lhi  = 0xa7,   op2_lhi  = 0x08,
+    op1_lghi = 0xa7,   op2_lghi = 0x09,
+    op1_lgfi = 0xc0,   op2_lgfi = 0x01,
+    op_lr    = 0x18,
+    op_lgr   = 0xb904,
+    op_l     = 0x58,
+    op1_ly   = 0xe3,   op2_ly   = 0x58,
+    op1_lg   = 0xe3,   op2_lg   = 0x04,
+    op_lm    = 0x98,
+    op1_lmy  = 0xeb,   op2_lmy  = 0x98,
+    op1_lmg  = 0xeb,   op2_lmg  = 0x04,
+    op_st    = 0x50,
+    op1_sty  = 0xe3,   op2_sty  = 0x50,
+    op1_stg  = 0xe3,   op2_stg  = 0x24,
+    op_std   = 0x60,
+    op_stm   = 0x90,
+    op1_stmy = 0xeb,   op2_stmy = 0x90,
+    op1_stmg = 0xeb,   op2_stmg = 0x24,
+    op1_aghi = 0xa7,   op2_aghi = 0x0b,
+    op1_ahi  = 0xa7,   op2_ahi  = 0x0a,
+    op1_agfi = 0xc2,   op2_agfi = 0x08,
+    op1_afi  = 0xc2,   op2_afi  = 0x09,
+    op1_algfi= 0xc2,   op2_algfi= 0x0a,
+    op1_alfi = 0xc2,   op2_alfi = 0x0b,
+    op_ar    = 0x1a,
+    op_agr   = 0xb908,
+    op_a     = 0x5a,
+    op1_ay   = 0xe3,   op2_ay   = 0x5a,
+    op1_ag   = 0xe3,   op2_ag   = 0x08,
+    op1_slgfi= 0xc2,   op2_slgfi= 0x04,
+    op1_slfi = 0xc2,   op2_slfi = 0x05,
+    op_sr    = 0x1b,
+    op_sgr   = 0xb909,
+    op_s     = 0x5b,
+    op1_sy   = 0xe3,   op2_sy   = 0x5b,
+    op1_sg   = 0xe3,   op2_sg   = 0x09,
+    op_nr    = 0x14,
+    op_ngr   = 0xb980,
+    op_la    = 0x41,
+    op1_lay  = 0xe3,   op2_lay  = 0x71,
+    op1_larl = 0xc0,   op2_larl = 0x00,
+    op_basr  = 0x0d,
+    op_bas   = 0x4d,
+    op_bcr   = 0x07,
+    op_bc    = 0x0d,
+    op_bctr  = 0x06,
+    op_bctgr = 0xb946,
+    op_bct   = 0x46,
+    op1_bctg = 0xe3,   op2_bctg = 0x46,
+    op_bxh   = 0x86,
+    op1_bxhg = 0xeb,   op2_bxhg = 0x44,
+    op_bxle  = 0x87,
+    op1_bxleg= 0xeb,   op2_bxleg= 0x45,
+    op1_bras = 0xa7,   op2_bras = 0x05,
+    op1_brasl= 0xc0,   op2_brasl= 0x05,
+    op1_brc  = 0xa7,   op2_brc  = 0x04,
+    op1_brcl = 0xc0,   op2_brcl = 0x04,
+    op1_brct = 0xa7,   op2_brct = 0x06,
+    op1_brctg= 0xa7,   op2_brctg= 0x07,
+    op_brxh  = 0x84,
+    op1_brxhg= 0xec,   op2_brxhg= 0x44,
+    op_brxle = 0x85,
+    op1_brxlg= 0xec,   op2_brxlg= 0x45,
+  };
+
+
+/* Read a single instruction from address AT.  */
+
+#define S390_MAX_INSTR_SIZE 6
+static int
+s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
+{
+  static int s390_instrlen[] = { 2, 4, 4, 6 };
+  int instrlen;
+
+  if (target_read_memory (at, &instr[0], 2))
+    return -1;
+  instrlen = s390_instrlen[instr[0] >> 6];
+  if (instrlen > 2)
+    {
+      if (target_read_memory (at + 2, &instr[2], instrlen - 2))
+        return -1;
+    }
+  return instrlen;
+}
+
+
+/* The functions below are for recognizing and decoding S/390
+   instructions of various formats.  Each of them checks whether INSN
+   is an instruction of the given format, with the specified opcodes.
+   If it is, it sets the remaining arguments to the values of the
+   instruction's fields, and returns a non-zero value; otherwise, it
+   returns zero.
+
+   These functions' arguments appear in the order they appear in the
+   instruction, not in the machine-language form.  So, opcodes always
+   come first, even though they're sometimes scattered around the
+   instructions.  And displacements appear before base and extension
+   registers, as they do in the assembly syntax, not at the end, as
+   they do in the machine language.  */
+static int
+is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
+{
+  if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      /* i2 is a 16-bit signed quantity.  */
+      *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_ril (bfd_byte *insn, int op1, int op2,
+        unsigned int *r1, int *i2)
+{
+  if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      /* i2 is a signed quantity.  If the host 'int' is 32 bits long,
+         no sign extension is necessary, but we don't want to assume
+         that.  */
+      *i2 = (((insn[2] << 24)
+              | (insn[3] << 16)
+              | (insn[4] << 8)
+              | (insn[5])) ^ 0x80000000) - 0x80000000;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+  if (insn[0] == op)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *r2 = insn[1] & 0xf;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+  if (((insn[0] << 8) | insn[1]) == op)
+    {
+      /* Yes, insn[3].  insn[2] is unused in RRE format.  */
+      *r1 = (insn[3] >> 4) & 0xf;
+      *r2 = insn[3] & 0xf;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rs (bfd_byte *insn, int op,
+       unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
+{
+  if (insn[0] == op)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *r3 = insn[1] & 0xf;
+      *b2 = (insn[2] >> 4) & 0xf;
+      *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rsy (bfd_byte *insn, int op1, int op2,
+        unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
+{
+  if (insn[0] == op1
+      && insn[5] == op2)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *r3 = insn[1] & 0xf;
+      *b2 = (insn[2] >> 4) & 0xf;
+      /* The 'long displacement' is a 20-bit signed integer.  */
+      *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12)) 
+		^ 0x80000) - 0x80000;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rsi (bfd_byte *insn, int op,
+        unsigned int *r1, unsigned int *r3, int *i2)
+{
+  if (insn[0] == op)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *r3 = insn[1] & 0xf;
+      /* i2 is a 16-bit signed quantity.  */
+      *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rie (bfd_byte *insn, int op1, int op2,
+        unsigned int *r1, unsigned int *r3, int *i2)
+{
+  if (insn[0] == op1
+      && insn[5] == op2)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *r3 = insn[1] & 0xf;
+      /* i2 is a 16-bit signed quantity.  */
+      *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rx (bfd_byte *insn, int op,
+       unsigned int *r1, int *d2, unsigned int *x2, unsigned int *b2)
+{
+  if (insn[0] == op)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *x2 = insn[1] & 0xf;
+      *b2 = (insn[2] >> 4) & 0xf;
+      *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+static int
+is_rxy (bfd_byte *insn, int op1, int op2,
+        unsigned int *r1, int *d2, unsigned int *x2, unsigned int *b2)
+{
+  if (insn[0] == op1
+      && insn[5] == op2)
+    {
+      *r1 = (insn[1] >> 4) & 0xf;
+      *x2 = insn[1] & 0xf;
+      *b2 = (insn[2] >> 4) & 0xf;
+      /* The 'long displacement' is a 20-bit signed integer.  */
+      *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12)) 
+		^ 0x80000) - 0x80000;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+
+/* Prologue analysis.  */
+
+#define S390_NUM_GPRS 16
+#define S390_NUM_FPRS 16
+
+struct s390_prologue_data {
+
+  /* The stack.  */
+  struct pv_area *stack;
+
+  /* The size and byte-order of a GPR or FPR.  */
+  int gpr_size;
+  int fpr_size;
+  enum bfd_endian byte_order;
+
+  /* The general-purpose registers.  */
+  pv_t gpr[S390_NUM_GPRS];
+
+  /* The floating-point registers.  */
+  pv_t fpr[S390_NUM_FPRS];
+
+  /* The offset relative to the CFA where the incoming GPR N was saved
+     by the function prologue.  0 if not saved or unknown.  */
+  int gpr_slot[S390_NUM_GPRS];
+
+  /* Likewise for FPRs.  */
+  int fpr_slot[S390_NUM_FPRS];
+
+  /* Nonzero if the backchain was saved.  This is assumed to be the
+     case when the incoming SP is saved at the current SP location.  */
+  int back_chain_saved_p;
+};
+
+/* Return the effective address for an X-style instruction, like:
+
+        L R1, D2(X2, B2)
+
+   Here, X2 and B2 are registers, and D2 is a signed 20-bit
+   constant; the effective address is the sum of all three.  If either
+   X2 or B2 are zero, then it doesn't contribute to the sum --- this
+   means that r0 can't be used as either X2 or B2.  */
+static pv_t
+s390_addr (struct s390_prologue_data *data,
+	   int d2, unsigned int x2, unsigned int b2)
+{
+  pv_t result;
+
+  result = pv_constant (d2);
+  if (x2)
+    result = pv_add (result, data->gpr[x2]);
+  if (b2)
+    result = pv_add (result, data->gpr[b2]);
+
+  return result;
+}
+
+/* Do a SIZE-byte store of VALUE to D2(X2,B2).  */
+static void
+s390_store (struct s390_prologue_data *data,
+	    int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
+	    pv_t value)
+{
+  pv_t addr = s390_addr (data, d2, x2, b2);
+  pv_t offset;
+
+  /* Check whether we are storing the backchain.  */
+  offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
+
+  if (pv_is_constant (offset) && offset.k == 0)
+    if (size == data->gpr_size
+	&& pv_is_register_k (value, S390_SP_REGNUM, 0))
+      {
+	data->back_chain_saved_p = 1;
+	return;
+      }
+
+
+  /* Check whether we are storing a register into the stack.  */
+  if (!pv_area_store_would_trash (data->stack, addr))
+    pv_area_store (data->stack, addr, size, value);
+
+
+  /* Note: If this is some store we cannot identify, you might think we
+     should forget our cached values, as any of those might have been hit.
+
+     However, we make the assumption that the register save areas are only
+     ever stored to once in any given function, and we do recognize these
+     stores.  Thus every store we cannot recognize does not hit our data.  */
+}
+
+/* Do a SIZE-byte load from D2(X2,B2).  */
+static pv_t
+s390_load (struct s390_prologue_data *data,
+	   int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
+	   
+{
+  pv_t addr = s390_addr (data, d2, x2, b2);
+
+  /* If it's a load from an in-line constant pool, then we can
+     simulate that, under the assumption that the code isn't
+     going to change between the time the processor actually
+     executed it creating the current frame, and the time when
+     we're analyzing the code to unwind past that frame.  */
+  if (pv_is_constant (addr))
+    {
+      struct target_section *secp;
+      secp = target_section_by_addr (&current_target, addr.k);
+      if (secp != NULL
+          && (bfd_get_section_flags (secp->the_bfd_section->owner,
+				     secp->the_bfd_section)
+              & SEC_READONLY))
+        return pv_constant (read_memory_integer (addr.k, size,
+						 data->byte_order));
+    }
+
+  /* Check whether we are accessing one of our save slots.  */
+  return pv_area_fetch (data->stack, addr, size);
+}
+
+/* Function for finding saved registers in a 'struct pv_area'; we pass
+   this to pv_area_scan.
+
+   If VALUE is a saved register, ADDR says it was saved at a constant
+   offset from the frame base, and SIZE indicates that the whole
+   register was saved, record its offset in the reg_offset table in
+   PROLOGUE_UNTYPED.  */
+static void
+s390_check_for_saved (void *data_untyped, pv_t addr,
+		      CORE_ADDR size, pv_t value)
+{
+  struct s390_prologue_data *data = data_untyped;
+  int i, offset;
+
+  if (!pv_is_register (addr, S390_SP_REGNUM))
+    return;
+
+  offset = 16 * data->gpr_size + 32 - addr.k;
+
+  /* If we are storing the original value of a register, we want to
+     record the CFA offset.  If the same register is stored multiple
+     times, the stack slot with the highest address counts.  */
+ 
+  for (i = 0; i < S390_NUM_GPRS; i++)
+    if (size == data->gpr_size
+	&& pv_is_register_k (value, S390_R0_REGNUM + i, 0))
+      if (data->gpr_slot[i] == 0
+	  || data->gpr_slot[i] > offset)
+	{
+	  data->gpr_slot[i] = offset;
+	  return;
+	}
+
+  for (i = 0; i < S390_NUM_FPRS; i++)
+    if (size == data->fpr_size
+	&& pv_is_register_k (value, S390_F0_REGNUM + i, 0))
+      if (data->fpr_slot[i] == 0
+	  || data->fpr_slot[i] > offset)
+	{
+	  data->fpr_slot[i] = offset;
+	  return;
+	}
+}
+
+/* Analyze the prologue of the function starting at START_PC,
+   continuing at most until CURRENT_PC.  Initialize DATA to
+   hold all information we find out about the state of the registers
+   and stack slots.  Return the address of the instruction after
+   the last one that changed the SP, FP, or back chain; or zero
+   on error.  */
+static CORE_ADDR
+s390_analyze_prologue (struct gdbarch *gdbarch,
+		       CORE_ADDR start_pc,
+		       CORE_ADDR current_pc,
+		       struct s390_prologue_data *data)
+{
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+  /* Our return value:
+     The address of the instruction after the last one that changed
+     the SP, FP, or back chain;  zero if we got an error trying to 
+     read memory.  */
+  CORE_ADDR result = start_pc;
+
+  /* The current PC for our abstract interpretation.  */
+  CORE_ADDR pc;
+
+  /* The address of the next instruction after that.  */
+  CORE_ADDR next_pc;
+  
+  /* Set up everything's initial value.  */
+  {
+    int i;
+
+    data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
+
+    /* For the purpose of prologue tracking, we consider the GPR size to
+       be equal to the ABI word size, even if it is actually larger
+       (i.e. when running a 32-bit binary under a 64-bit kernel).  */
+    data->gpr_size = word_size;
+    data->fpr_size = 8;
+    data->byte_order = gdbarch_byte_order (gdbarch);
+
+    for (i = 0; i < S390_NUM_GPRS; i++)
+      data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
+
+    for (i = 0; i < S390_NUM_FPRS; i++)
+      data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
+
+    for (i = 0; i < S390_NUM_GPRS; i++)
+      data->gpr_slot[i]  = 0;
+
+    for (i = 0; i < S390_NUM_FPRS; i++)
+      data->fpr_slot[i]  = 0;
+
+    data->back_chain_saved_p = 0;
+  }
+
+  /* Start interpreting instructions, until we hit the frame's
+     current PC or the first branch instruction.  */
+  for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
+    {
+      bfd_byte insn[S390_MAX_INSTR_SIZE];
+      int insn_len = s390_readinstruction (insn, pc);
+
+      bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
+      bfd_byte *insn32 = word_size == 4 ? insn : dummy;
+      bfd_byte *insn64 = word_size == 8 ? insn : dummy;
+
+      /* Fields for various kinds of instructions.  */
+      unsigned int b2, r1, r2, x2, r3;
+      int i2, d2;
+
+      /* The values of SP and FP before this instruction,
+         for detecting instructions that change them.  */
+      pv_t pre_insn_sp, pre_insn_fp;
+      /* Likewise for the flag whether the back chain was saved.  */
+      int pre_insn_back_chain_saved_p;
+
+      /* If we got an error trying to read the instruction, report it.  */
+      if (insn_len < 0)
+        {
+          result = 0;
+          break;
+        }
+
+      next_pc = pc + insn_len;
+
+      pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+      pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+      pre_insn_back_chain_saved_p = data->back_chain_saved_p;
+
+
+      /* LHI r1, i2 --- load halfword immediate.  */
+      /* LGHI r1, i2 --- load halfword immediate (64-bit version).  */
+      /* LGFI r1, i2 --- load fullword immediate.  */
+      if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
+          || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
+          || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
+	data->gpr[r1] = pv_constant (i2);
+
+      /* LR r1, r2 --- load from register.  */
+      /* LGR r1, r2 --- load from register (64-bit version).  */
+      else if (is_rr (insn32, op_lr, &r1, &r2)
+	       || is_rre (insn64, op_lgr, &r1, &r2))
+	data->gpr[r1] = data->gpr[r2];
+
+      /* L r1, d2(x2, b2) --- load.  */
+      /* LY r1, d2(x2, b2) --- load (long-displacement version).  */
+      /* LG r1, d2(x2, b2) --- load (64-bit version).  */
+      else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
+	data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
+
+      /* ST r1, d2(x2, b2) --- store.  */
+      /* STY r1, d2(x2, b2) --- store (long-displacement version).  */
+      /* STG r1, d2(x2, b2) --- store (64-bit version).  */
+      else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
+	s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
+
+      /* STD r1, d2(x2,b2) --- store floating-point register.  */
+      else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
+	s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
+
+      /* STM r1, r3, d2(b2) --- store multiple.  */
+      /* STMY r1, r3, d2(b2) --- store multiple (long-displacement
+	 version).  */
+      /* STMG r1, r3, d2(b2) --- store multiple (64-bit version).  */
+      else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
+	       || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
+	       || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
+        {
+          for (; r1 <= r3; r1++, d2 += data->gpr_size)
+	    s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
+        }
+
+      /* AHI r1, i2 --- add halfword immediate.  */
+      /* AGHI r1, i2 --- add halfword immediate (64-bit version).  */
+      /* AFI r1, i2 --- add fullword immediate.  */
+      /* AGFI r1, i2 --- add fullword immediate (64-bit version).  */
+      else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
+	       || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
+	       || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
+	       || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
+	data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
+
+      /* ALFI r1, i2 --- add logical immediate.  */
+      /* ALGFI r1, i2 --- add logical immediate (64-bit version).  */
+      else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
+	       || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
+	data->gpr[r1] = pv_add_constant (data->gpr[r1],
+					 (CORE_ADDR)i2 & 0xffffffff);
+
+      /* AR r1, r2 -- add register.  */
+      /* AGR r1, r2 -- add register (64-bit version).  */
+      else if (is_rr (insn32, op_ar, &r1, &r2)
+	       || is_rre (insn64, op_agr, &r1, &r2))
+	data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
+
+      /* A r1, d2(x2, b2) -- add.  */
+      /* AY r1, d2(x2, b2) -- add (long-displacement version).  */
+      /* AG r1, d2(x2, b2) -- add (64-bit version).  */
+      else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
+	data->gpr[r1] = pv_add (data->gpr[r1],
+				s390_load (data, d2, x2, b2, data->gpr_size));
+
+      /* SLFI r1, i2 --- subtract logical immediate.  */
+      /* SLGFI r1, i2 --- subtract logical immediate (64-bit version).  */
+      else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
+	       || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
+	data->gpr[r1] = pv_add_constant (data->gpr[r1],
+					 -((CORE_ADDR)i2 & 0xffffffff));
+
+      /* SR r1, r2 -- subtract register.  */
+      /* SGR r1, r2 -- subtract register (64-bit version).  */
+      else if (is_rr (insn32, op_sr, &r1, &r2)
+	       || is_rre (insn64, op_sgr, &r1, &r2))
+	data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
+
+      /* S r1, d2(x2, b2) -- subtract.  */
+      /* SY r1, d2(x2, b2) -- subtract (long-displacement version).  */
+      /* SG r1, d2(x2, b2) -- subtract (64-bit version).  */
+      else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
+	       || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
+	data->gpr[r1] = pv_subtract (data->gpr[r1],
+				s390_load (data, d2, x2, b2, data->gpr_size));
+
+      /* LA r1, d2(x2, b2) --- load address.  */
+      /* LAY r1, d2(x2, b2) --- load address (long-displacement version).  */
+      else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
+               || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
+	data->gpr[r1] = s390_addr (data, d2, x2, b2);
+
+      /* LARL r1, i2 --- load address relative long.  */
+      else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+	data->gpr[r1] = pv_constant (pc + i2 * 2);
+
+      /* BASR r1, 0 --- branch and save.
+         Since r2 is zero, this saves the PC in r1, but doesn't branch.  */
+      else if (is_rr (insn, op_basr, &r1, &r2)
+               && r2 == 0)
+	data->gpr[r1] = pv_constant (next_pc);
+
+      /* BRAS r1, i2 --- branch relative and save.  */
+      else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
+        {
+          data->gpr[r1] = pv_constant (next_pc);
+          next_pc = pc + i2 * 2;
+
+          /* We'd better not interpret any backward branches.  We'll
+             never terminate.  */
+          if (next_pc <= pc)
+            break;
+        }
+
+      /* Terminate search when hitting any other branch instruction.  */
+      else if (is_rr (insn, op_basr, &r1, &r2)
+	       || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
+	       || is_rr (insn, op_bcr, &r1, &r2)
+	       || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
+	       || is_ri (insn, op1_brc, op2_brc, &r1, &i2)
+	       || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
+	       || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
+	break;
+
+      else
+	{
+	  /* An instruction we don't know how to simulate.  The only
+	     safe thing to do would be to set every value we're tracking
+	     to 'unknown'.  Instead, we'll be optimistic: we assume that
+	     we *can* interpret every instruction that the compiler uses
+	     to manipulate any of the data we're interested in here --
+	     then we can just ignore anything else.  */
+	}
+
+      /* Record the address after the last instruction that changed
+         the FP, SP, or backlink.  Ignore instructions that changed
+         them back to their original values --- those are probably
+         restore instructions.  (The back chain is never restored,
+         just popped.)  */
+      {
+        pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+        pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+        
+        if ((! pv_is_identical (pre_insn_sp, sp)
+             && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
+	     && sp.kind != pvk_unknown)
+            || (! pv_is_identical (pre_insn_fp, fp)
+                && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
+		&& fp.kind != pvk_unknown)
+            || pre_insn_back_chain_saved_p != data->back_chain_saved_p)
+          result = next_pc;
+      }
+    }
+
+  /* Record where all the registers were saved.  */
+  pv_area_scan (data->stack, s390_check_for_saved, data);
+
+  free_pv_area (data->stack);
+  data->stack = NULL;
+
+  return result;
+}
+
+/* Advance PC across any function entry prologue instructions to reach 
+   some "real" code.  */
+static CORE_ADDR
+s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  struct s390_prologue_data data;
+  CORE_ADDR skip_pc;
+  skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
+  return skip_pc ? skip_pc : pc;
+}
+
+/* Return true if we are in the functin's epilogue, i.e. after the
+   instruction that destroyed the function's stack frame.  */
+static int
+s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+  /* In frameless functions, there's not frame to destroy and thus
+     we don't care about the epilogue.
+
+     In functions with frame, the epilogue sequence is a pair of
+     a LM-type instruction that restores (amongst others) the
+     return register %r14 and the stack pointer %r15, followed
+     by a branch 'br %r14' --or equivalent-- that effects the
+     actual return.
+
+     In that situation, this function needs to return 'true' in
+     exactly one case: when pc points to that branch instruction.
+
+     Thus we try to disassemble the one instructions immediately
+     preceding pc and check whether it is an LM-type instruction
+     modifying the stack pointer.
+
+     Note that disassembling backwards is not reliable, so there
+     is a slight chance of false positives here ...  */
+
+  bfd_byte insn[6];
+  unsigned int r1, r3, b2;
+  int d2;
+
+  if (word_size == 4
+      && !target_read_memory (pc - 4, insn, 4)
+      && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
+      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+    return 1;
+
+  if (word_size == 4
+      && !target_read_memory (pc - 6, insn, 6)
+      && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
+      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+    return 1;
+
+  if (word_size == 8
+      && !target_read_memory (pc - 6, insn, 6)
+      && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
+      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+    return 1;
+
+  return 0;
+}
+
+/* Displaced stepping.  */
+
+/* Fix up the state of registers and memory after having single-stepped
+   a displaced instruction.  */
+static void
+s390_displaced_step_fixup (struct gdbarch *gdbarch,
+			   struct displaced_step_closure *closure,
+			   CORE_ADDR from, CORE_ADDR to,
+			   struct regcache *regs)
+{
+  /* Since we use simple_displaced_step_copy_insn, our closure is a
+     copy of the instruction.  */
+  gdb_byte *insn = (gdb_byte *) closure;
+  static int s390_instrlen[] = { 2, 4, 4, 6 };
+  int insnlen = s390_instrlen[insn[0] >> 6];
+
+  /* Fields for various kinds of instructions.  */
+  unsigned int b2, r1, r2, x2, r3;
+  int i2, d2;
+
+  /* Get current PC and addressing mode bit.  */
+  CORE_ADDR pc = regcache_read_pc (regs);
+  ULONGEST amode = 0;
+
+  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+    {
+      regcache_cooked_read_unsigned (regs, S390_PSWA_REGNUM, &amode);
+      amode &= 0x80000000;
+    }
+
+  if (debug_displaced)
+    fprintf_unfiltered (gdb_stdlog,
+			"displaced: (s390) fixup (%s, %s) pc %s len %d amode 0x%x\n",
+			paddress (gdbarch, from), paddress (gdbarch, to),
+			paddress (gdbarch, pc), insnlen, (int) amode);
+
+  /* Handle absolute branch and save instructions.  */
+  if (is_rr (insn, op_basr, &r1, &r2)
+      || is_rx (insn, op_bas, &r1, &d2, &x2, &b2))
+    {
+      /* Recompute saved return address in R1.  */
+      regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
+				      amode | (from + insnlen));
+    }
+
+  /* Handle absolute branch instructions.  */
+  else if (is_rr (insn, op_bcr, &r1, &r2)
+	   || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
+	   || is_rr (insn, op_bctr, &r1, &r2)
+	   || is_rre (insn, op_bctgr, &r1, &r2)
+	   || is_rx (insn, op_bct, &r1, &d2, &x2, &b2)
+	   || is_rxy (insn, op1_bctg, op2_brctg, &r1, &d2, &x2, &b2)
+	   || is_rs (insn, op_bxh, &r1, &r3, &d2, &b2)
+	   || is_rsy (insn, op1_bxhg, op2_bxhg, &r1, &r3, &d2, &b2)
+	   || is_rs (insn, op_bxle, &r1, &r3, &d2, &b2)
+	   || is_rsy (insn, op1_bxleg, op2_bxleg, &r1, &r3, &d2, &b2))
+    {
+      /* Update PC iff branch was *not* taken.  */
+      if (pc == to + insnlen)
+	regcache_write_pc (regs, from + insnlen);
+    }
+
+  /* Handle PC-relative branch and save instructions.  */
+  else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)
+           || is_ril (insn, op1_brasl, op2_brasl, &r1, &i2))
+    {
+      /* Update PC.  */
+      regcache_write_pc (regs, pc - to + from);
+      /* Recompute saved return address in R1.  */
+      regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
+				      amode | (from + insnlen));
+    }
+
+  /* Handle PC-relative branch instructions.  */
+  else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2)
+	   || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
+	   || is_ri (insn, op1_brct, op2_brct, &r1, &i2)
+	   || is_ri (insn, op1_brctg, op2_brctg, &r1, &i2)
+	   || is_rsi (insn, op_brxh, &r1, &r3, &i2)
+	   || is_rie (insn, op1_brxhg, op2_brxhg, &r1, &r3, &i2)
+	   || is_rsi (insn, op_brxle, &r1, &r3, &i2)
+	   || is_rie (insn, op1_brxlg, op2_brxlg, &r1, &r3, &i2))
+    {
+      /* Update PC.  */
+      regcache_write_pc (regs, pc - to + from);
+    }
+
+  /* Handle LOAD ADDRESS RELATIVE LONG.  */
+  else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+    {
+      /* Update PC.  */
+      regcache_write_pc (regs, from + insnlen);
+      /* Recompute output address in R1.  */ 
+      regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
+				      amode | (from + i2 * 2));
+    }
+
+  /* If we executed a breakpoint instruction, point PC right back at it.  */
+  else if (insn[0] == 0x0 && insn[1] == 0x1)
+    regcache_write_pc (regs, from);
+
+  /* For any other insn, PC points right after the original instruction.  */
+  else
+    regcache_write_pc (regs, from + insnlen);
+
+  if (debug_displaced)
+    fprintf_unfiltered (gdb_stdlog,
+			"displaced: (s390) pc is now %s\n",
+			paddress (gdbarch, regcache_read_pc (regs)));
+}
+
+
+/* Helper routine to unwind pseudo registers.  */
+
+static struct value *
+s390_unwind_pseudo_register (struct frame_info *this_frame, int regnum)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  struct type *type = register_type (gdbarch, regnum);
+
+  /* Unwind PC via PSW address.  */
+  if (regnum == tdep->pc_regnum)
+    {
+      struct value *val;
+
+      val = frame_unwind_register_value (this_frame, S390_PSWA_REGNUM);
+      if (!value_optimized_out (val))
+	{
+	  LONGEST pswa = value_as_long (val);
+
+	  if (TYPE_LENGTH (type) == 4)
+	    return value_from_pointer (type, pswa & 0x7fffffff);
+	  else
+	    return value_from_pointer (type, pswa);
+	}
+    }
+
+  /* Unwind CC via PSW mask.  */
+  if (regnum == tdep->cc_regnum)
+    {
+      struct value *val;
+
+      val = frame_unwind_register_value (this_frame, S390_PSWM_REGNUM);
+      if (!value_optimized_out (val))
+	{
+	  LONGEST pswm = value_as_long (val);
+
+	  if (TYPE_LENGTH (type) == 4)
+	    return value_from_longest (type, (pswm >> 12) & 3);
+	  else
+	    return value_from_longest (type, (pswm >> 44) & 3);
+	}
+    }
+
+  /* Unwind full GPRs to show at least the lower halves (as the
+     upper halves are undefined).  */
+  if (regnum_is_gpr_full (tdep, regnum))
+    {
+      int reg = regnum - tdep->gpr_full_regnum;
+      struct value *val;
+
+      val = frame_unwind_register_value (this_frame, S390_R0_REGNUM + reg);
+      if (!value_optimized_out (val))
+	return value_cast (type, val);
+    }
+
+  return allocate_optimized_out_value (type);
+}
+
+static struct value *
+s390_trad_frame_prev_register (struct frame_info *this_frame,
+			       struct trad_frame_saved_reg saved_regs[],
+			       int regnum)
+{
+  if (regnum < S390_NUM_REGS)
+    return trad_frame_get_prev_register (this_frame, saved_regs, regnum);
+  else
+    return s390_unwind_pseudo_register (this_frame, regnum);
+}
+
+
+/* Normal stack frames.  */
+
+struct s390_unwind_cache {
+
+  CORE_ADDR func;
+  CORE_ADDR frame_base;
+  CORE_ADDR local_base;
+
+  struct trad_frame_saved_reg *saved_regs;
+};
+
+static int
+s390_prologue_frame_unwind_cache (struct frame_info *this_frame,
+				  struct s390_unwind_cache *info)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  struct s390_prologue_data data;
+  pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+  pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+  int i;
+  CORE_ADDR cfa;
+  CORE_ADDR func;
+  CORE_ADDR result;
+  ULONGEST reg;
+  CORE_ADDR prev_sp;
+  int frame_pointer;
+  int size;
+  struct frame_info *next_frame;
+
+  /* Try to find the function start address.  If we can't find it, we don't
+     bother searching for it -- with modern compilers this would be mostly
+     pointless anyway.  Trust that we'll either have valid DWARF-2 CFI data
+     or else a valid backchain ...  */
+  func = get_frame_func (this_frame);
+  if (!func)
+    return 0;
+
+  /* Try to analyze the prologue.  */
+  result = s390_analyze_prologue (gdbarch, func,
+				  get_frame_pc (this_frame), &data);
+  if (!result)
+    return 0;
+
+  /* If this was successful, we should have found the instruction that
+     sets the stack pointer register to the previous value of the stack 
+     pointer minus the frame size.  */
+  if (!pv_is_register (*sp, S390_SP_REGNUM))
+    return 0;
+
+  /* A frame size of zero at this point can mean either a real 
+     frameless function, or else a failure to find the prologue.
+     Perform some sanity checks to verify we really have a 
+     frameless function.  */
+  if (sp->k == 0)
+    {
+      /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame 
+	 size zero.  This is only possible if the next frame is a sentinel 
+	 frame, a dummy frame, or a signal trampoline frame.  */
+      /* FIXME: cagney/2004-05-01: This sanity check shouldn't be
+	 needed, instead the code should simpliy rely on its
+	 analysis.  */
+      next_frame = get_next_frame (this_frame);
+      while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
+	next_frame = get_next_frame (next_frame);
+      if (next_frame
+	  && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
+	return 0;
+
+      /* If we really have a frameless function, %r14 must be valid
+	 -- in particular, it must point to a different function.  */
+      reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);
+      reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
+      if (get_pc_function_start (reg) == func)
+	{
+	  /* However, there is one case where it *is* valid for %r14
+	     to point to the same function -- if this is a recursive
+	     call, and we have stopped in the prologue *before* the
+	     stack frame was allocated.
+
+	     Recognize this case by looking ahead a bit ...  */
+
+	  struct s390_prologue_data data2;
+	  pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+
+	  if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
+	        && pv_is_register (*sp, S390_SP_REGNUM)
+	        && sp->k != 0))
+	    return 0;
+	}
+    }
+
+
+  /* OK, we've found valid prologue data.  */
+  size = -sp->k;
+
+  /* If the frame pointer originally also holds the same value
+     as the stack pointer, we're probably using it.  If it holds
+     some other value -- even a constant offset -- it is most
+     likely used as temp register.  */
+  if (pv_is_identical (*sp, *fp))
+    frame_pointer = S390_FRAME_REGNUM;
+  else
+    frame_pointer = S390_SP_REGNUM;
+
+  /* If we've detected a function with stack frame, we'll still have to 
+     treat it as frameless if we're currently within the function epilog 
+     code at a point where the frame pointer has already been restored.
+     This can only happen in an innermost frame.  */
+  /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
+     instead the code should simpliy rely on its analysis.  */
+  next_frame = get_next_frame (this_frame);
+  while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
+    next_frame = get_next_frame (next_frame);
+  if (size > 0
+      && (next_frame == NULL
+	  || get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))
+    {
+      /* See the comment in s390_in_function_epilogue_p on why this is
+	 not completely reliable ...  */
+      if (s390_in_function_epilogue_p (gdbarch, get_frame_pc (this_frame)))
+	{
+	  memset (&data, 0, sizeof (data));
+	  size = 0;
+	  frame_pointer = S390_SP_REGNUM;
+	}
+    }
+
+  /* Once we know the frame register and the frame size, we can unwind
+     the current value of the frame register from the next frame, and
+     add back the frame size to arrive that the previous frame's 
+     stack pointer value.  */
+  prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;
+  cfa = prev_sp + 16*word_size + 32;
+
+  /* Set up ABI call-saved/call-clobbered registers.  */
+  for (i = 0; i < S390_NUM_REGS; i++)
+    if (!s390_register_call_saved (gdbarch, i))
+      trad_frame_set_unknown (info->saved_regs, i);
+
+  /* CC is always call-clobbered.  */
+  trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
+
+  /* Record the addresses of all register spill slots the prologue parser
+     has recognized.  Consider only registers defined as call-saved by the
+     ABI; for call-clobbered registers the parser may have recognized
+     spurious stores.  */
+
+  for (i = 0; i < 16; i++)
+    if (s390_register_call_saved (gdbarch, S390_R0_REGNUM + i)
+	&& data.gpr_slot[i] != 0)
+      info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
+
+  for (i = 0; i < 16; i++)
+    if (s390_register_call_saved (gdbarch, S390_F0_REGNUM + i)
+	&& data.fpr_slot[i] != 0)
+      info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
+
+  /* Function return will set PC to %r14.  */
+  info->saved_regs[S390_PSWA_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
+
+  /* In frameless functions, we unwind simply by moving the return
+     address to the PC.  However, if we actually stored to the
+     save area, use that -- we might only think the function frameless
+     because we're in the middle of the prologue ...  */
+  if (size == 0
+      && !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
+    {
+      info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
+    }
+
+  /* Another sanity check: unless this is a frameless function,
+     we should have found spill slots for SP and PC.
+     If not, we cannot unwind further -- this happens e.g. in
+     libc's thread_start routine.  */
+  if (size > 0)
+    {
+      if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
+	  || !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
+	prev_sp = -1;
+    }
+
+  /* We use the current value of the frame register as local_base,
+     and the top of the register save area as frame_base.  */
+  if (prev_sp != -1)
+    {
+      info->frame_base = prev_sp + 16*word_size + 32;
+      info->local_base = prev_sp - size;
+    }
+
+  info->func = func;
+  return 1;
+}
+
+static void
+s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
+				   struct s390_unwind_cache *info)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  CORE_ADDR backchain;
+  ULONGEST reg;
+  LONGEST sp;
+  int i;
+
+  /* Set up ABI call-saved/call-clobbered registers.  */
+  for (i = 0; i < S390_NUM_REGS; i++)
+    if (!s390_register_call_saved (gdbarch, i))
+      trad_frame_set_unknown (info->saved_regs, i);
+
+  /* CC is always call-clobbered.  */
+  trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
+
+  /* Get the backchain.  */
+  reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+  backchain = read_memory_unsigned_integer (reg, word_size, byte_order);
+
+  /* A zero backchain terminates the frame chain.  As additional
+     sanity check, let's verify that the spill slot for SP in the
+     save area pointed to by the backchain in fact links back to
+     the save area.  */
+  if (backchain != 0
+      && safe_read_memory_integer (backchain + 15*word_size,
+				   word_size, byte_order, &sp)
+      && (CORE_ADDR)sp == backchain)
+    {
+      /* We don't know which registers were saved, but it will have
+         to be at least %r14 and %r15.  This will allow us to continue
+         unwinding, but other prev-frame registers may be incorrect ...  */
+      info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
+      info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
+
+      /* Function return will set PC to %r14.  */
+      info->saved_regs[S390_PSWA_REGNUM]
+	= info->saved_regs[S390_RETADDR_REGNUM];
+
+      /* We use the current value of the frame register as local_base,
+         and the top of the register save area as frame_base.  */
+      info->frame_base = backchain + 16*word_size + 32;
+      info->local_base = reg;
+    }
+
+  info->func = get_frame_pc (this_frame);
+}
+
+static struct s390_unwind_cache *
+s390_frame_unwind_cache (struct frame_info *this_frame,
+			 void **this_prologue_cache)
+{
+  struct s390_unwind_cache *info;
+  if (*this_prologue_cache)
+    return *this_prologue_cache;
+
+  info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
+  *this_prologue_cache = info;
+  info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+  info->func = -1;
+  info->frame_base = -1;
+  info->local_base = -1;
+
+  /* Try to use prologue analysis to fill the unwind cache.
+     If this fails, fall back to reading the stack backchain.  */
+  if (!s390_prologue_frame_unwind_cache (this_frame, info))
+    s390_backchain_frame_unwind_cache (this_frame, info);
+
+  return info;
+}
+
+static void
+s390_frame_this_id (struct frame_info *this_frame,
+		    void **this_prologue_cache,
+		    struct frame_id *this_id)
+{
+  struct s390_unwind_cache *info
+    = s390_frame_unwind_cache (this_frame, this_prologue_cache);
+
+  if (info->frame_base == -1)
+    return;
+
+  *this_id = frame_id_build (info->frame_base, info->func);
+}
+
+static struct value *
+s390_frame_prev_register (struct frame_info *this_frame,
+			  void **this_prologue_cache, int regnum)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  struct s390_unwind_cache *info
+    = s390_frame_unwind_cache (this_frame, this_prologue_cache);
+
+  return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static const struct frame_unwind s390_frame_unwind = {
+  NORMAL_FRAME,
+  default_frame_unwind_stop_reason,
+  s390_frame_this_id,
+  s390_frame_prev_register,
+  NULL,
+  default_frame_sniffer
+};
+
+
+/* Code stubs and their stack frames.  For things like PLTs and NULL
+   function calls (where there is no true frame and the return address
+   is in the RETADDR register).  */
+
+struct s390_stub_unwind_cache
+{
+  CORE_ADDR frame_base;
+  struct trad_frame_saved_reg *saved_regs;
+};
+
+static struct s390_stub_unwind_cache *
+s390_stub_frame_unwind_cache (struct frame_info *this_frame,
+			      void **this_prologue_cache)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  struct s390_stub_unwind_cache *info;
+  ULONGEST reg;
+
+  if (*this_prologue_cache)
+    return *this_prologue_cache;
+
+  info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
+  *this_prologue_cache = info;
+  info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+  /* The return address is in register %r14.  */
+  info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
+
+  /* Retrieve stack pointer and determine our frame base.  */
+  reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+  info->frame_base = reg + 16*word_size + 32;
+
+  return info;
+}
+
+static void
+s390_stub_frame_this_id (struct frame_info *this_frame,
+			 void **this_prologue_cache,
+			 struct frame_id *this_id)
+{
+  struct s390_stub_unwind_cache *info
+    = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
+  *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
+}
+
+static struct value *
+s390_stub_frame_prev_register (struct frame_info *this_frame,
+			       void **this_prologue_cache, int regnum)
+{
+  struct s390_stub_unwind_cache *info
+    = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
+  return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static int
+s390_stub_frame_sniffer (const struct frame_unwind *self,
+			 struct frame_info *this_frame,
+			 void **this_prologue_cache)
+{
+  CORE_ADDR addr_in_block;
+  bfd_byte insn[S390_MAX_INSTR_SIZE];
+
+  /* If the current PC points to non-readable memory, we assume we
+     have trapped due to an invalid function pointer call.  We handle
+     the non-existing current function like a PLT stub.  */
+  addr_in_block = get_frame_address_in_block (this_frame);
+  if (in_plt_section (addr_in_block)
+      || s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)
+    return 1;
+  return 0;
+}
+
+static const struct frame_unwind s390_stub_frame_unwind = {
+  NORMAL_FRAME,
+  default_frame_unwind_stop_reason,
+  s390_stub_frame_this_id,
+  s390_stub_frame_prev_register,
+  NULL,
+  s390_stub_frame_sniffer
+};
+
+
+/* Signal trampoline stack frames.  */
+
+struct s390_sigtramp_unwind_cache {
+  CORE_ADDR frame_base;
+  struct trad_frame_saved_reg *saved_regs;
+};
+
+static struct s390_sigtramp_unwind_cache *
+s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
+				  void **this_prologue_cache)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  struct s390_sigtramp_unwind_cache *info;
+  ULONGEST this_sp, prev_sp;
+  CORE_ADDR next_ra, next_cfa, sigreg_ptr, sigreg_high_off;
+  int i;
+
+  if (*this_prologue_cache)
+    return *this_prologue_cache;
+
+  info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
+  *this_prologue_cache = info;
+  info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+  this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+  next_ra = get_frame_pc (this_frame);
+  next_cfa = this_sp + 16*word_size + 32;
+
+  /* New-style RT frame:
+	retcode + alignment (8 bytes)
+	siginfo (128 bytes)
+	ucontext (contains sigregs at offset 5 words).  */
+  if (next_ra == next_cfa)
+    {
+      sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
+      /* sigregs are followed by uc_sigmask (8 bytes), then by the
+	 upper GPR halves if present.  */
+      sigreg_high_off = 8;
+    }
+
+  /* Old-style RT frame and all non-RT frames:
+	old signal mask (8 bytes)
+	pointer to sigregs.  */
+  else
+    {
+      sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8,
+						 word_size, byte_order);
+      /* sigregs are followed by signo (4 bytes), then by the
+	 upper GPR halves if present.  */
+      sigreg_high_off = 4;
+    }
+
+  /* The sigregs structure looks like this:
+            long   psw_mask;
+            long   psw_addr;
+            long   gprs[16];
+            int    acrs[16];
+            int    fpc;
+            int    __pad;
+            double fprs[16];  */
+
+  /* PSW mask and address.  */
+  info->saved_regs[S390_PSWM_REGNUM].addr = sigreg_ptr;
+  sigreg_ptr += word_size;
+  info->saved_regs[S390_PSWA_REGNUM].addr = sigreg_ptr;
+  sigreg_ptr += word_size;
+
+  /* Then the GPRs.  */
+  for (i = 0; i < 16; i++)
+    {
+      info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
+      sigreg_ptr += word_size;
+    }
+
+  /* Then the ACRs.  */
+  for (i = 0; i < 16; i++)
+    {
+      info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
+      sigreg_ptr += 4;
+    }
+
+  /* The floating-point control word.  */
+  info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
+  sigreg_ptr += 8;
+
+  /* And finally the FPRs.  */
+  for (i = 0; i < 16; i++)
+    {
+      info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
+      sigreg_ptr += 8;
+    }
+
+  /* If we have them, the GPR upper halves are appended at the end.  */
+  sigreg_ptr += sigreg_high_off;
+  if (tdep->gpr_full_regnum != -1)
+    for (i = 0; i < 16; i++)
+      {
+        info->saved_regs[S390_R0_UPPER_REGNUM + i].addr = sigreg_ptr;
+	sigreg_ptr += 4;
+      }
+
+  /* Restore the previous frame's SP.  */
+  prev_sp = read_memory_unsigned_integer (
+			info->saved_regs[S390_SP_REGNUM].addr,
+			word_size, byte_order);
+
+  /* Determine our frame base.  */
+  info->frame_base = prev_sp + 16*word_size + 32;
+
+  return info;
+}
+
+static void
+s390_sigtramp_frame_this_id (struct frame_info *this_frame,
+			     void **this_prologue_cache,
+			     struct frame_id *this_id)
+{
+  struct s390_sigtramp_unwind_cache *info
+    = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+  *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
+}
+
+static struct value *
+s390_sigtramp_frame_prev_register (struct frame_info *this_frame,
+				   void **this_prologue_cache, int regnum)
+{
+  struct s390_sigtramp_unwind_cache *info
+    = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
+  return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static int
+s390_sigtramp_frame_sniffer (const struct frame_unwind *self,
+			     struct frame_info *this_frame,
+			     void **this_prologue_cache)
+{
+  CORE_ADDR pc = get_frame_pc (this_frame);
+  bfd_byte sigreturn[2];
+
+  if (target_read_memory (pc, sigreturn, 2))
+    return 0;
+
+  if (sigreturn[0] != 0x0a /* svc */)
+    return 0;
+
+  if (sigreturn[1] != 119 /* sigreturn */
+      && sigreturn[1] != 173 /* rt_sigreturn */)
+    return 0;
+  
+  return 1;
+}
+
+static const struct frame_unwind s390_sigtramp_frame_unwind = {
+  SIGTRAMP_FRAME,
+  default_frame_unwind_stop_reason,
+  s390_sigtramp_frame_this_id,
+  s390_sigtramp_frame_prev_register,
+  NULL,
+  s390_sigtramp_frame_sniffer
+};
+
+
+/* Frame base handling.  */
+
+static CORE_ADDR
+s390_frame_base_address (struct frame_info *this_frame, void **this_cache)
+{
+  struct s390_unwind_cache *info
+    = s390_frame_unwind_cache (this_frame, this_cache);
+  return info->frame_base;
+}
+
+static CORE_ADDR
+s390_local_base_address (struct frame_info *this_frame, void **this_cache)
+{
+  struct s390_unwind_cache *info
+    = s390_frame_unwind_cache (this_frame, this_cache);
+  return info->local_base;
+}
+
+static const struct frame_base s390_frame_base = {
+  &s390_frame_unwind,
+  s390_frame_base_address,
+  s390_local_base_address,
+  s390_local_base_address
+};
+
+static CORE_ADDR
+s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  ULONGEST pc;
+  pc = frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);
+  return gdbarch_addr_bits_remove (gdbarch, pc);
+}
+
+static CORE_ADDR
+s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+  ULONGEST sp;
+  sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+  return gdbarch_addr_bits_remove (gdbarch, sp);
+}
+
+
+/* DWARF-2 frame support.  */
+
+static struct value *
+s390_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
+			   int regnum)
+{
+  return s390_unwind_pseudo_register (this_frame, regnum);
+}
+
+static void
+s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+                            struct dwarf2_frame_state_reg *reg,
+			    struct frame_info *this_frame)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* The condition code (and thus PSW mask) is call-clobbered.  */
+  if (regnum == S390_PSWM_REGNUM)
+    reg->how = DWARF2_FRAME_REG_UNDEFINED;
+
+  /* The PSW address unwinds to the return address.  */
+  else if (regnum == S390_PSWA_REGNUM)
+    reg->how = DWARF2_FRAME_REG_RA;
+
+  /* Fixed registers are call-saved or call-clobbered
+     depending on the ABI in use.  */
+  else if (regnum < S390_NUM_REGS)
+    {
+      if (s390_register_call_saved (gdbarch, regnum))
+	reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+      else
+	reg->how = DWARF2_FRAME_REG_UNDEFINED;
+    }
+
+  /* We install a special function to unwind pseudos.  */
+  else
+    {
+      reg->how = DWARF2_FRAME_REG_FN;
+      reg->loc.fn = s390_dwarf2_prev_register;
+    }
+}
+
+
+/* Dummy function calls.  */
+
+/* Return non-zero if TYPE is an integer-like type, zero otherwise.
+   "Integer-like" types are those that should be passed the way
+   integers are: integers, enums, ranges, characters, and booleans.  */
+static int
+is_integer_like (struct type *type)
+{
+  enum type_code code = TYPE_CODE (type);
+
+  return (code == TYPE_CODE_INT
+          || code == TYPE_CODE_ENUM
+          || code == TYPE_CODE_RANGE
+          || code == TYPE_CODE_CHAR
+          || code == TYPE_CODE_BOOL);
+}
+
+/* Return non-zero if TYPE is a pointer-like type, zero otherwise.
+   "Pointer-like" types are those that should be passed the way
+   pointers are: pointers and references.  */
+static int
+is_pointer_like (struct type *type)
+{
+  enum type_code code = TYPE_CODE (type);
+
+  return (code == TYPE_CODE_PTR
+          || code == TYPE_CODE_REF);
+}
+
+
+/* Return non-zero if TYPE is a `float singleton' or `double
+   singleton', zero otherwise.
+
+   A `T singleton' is a struct type with one member, whose type is
+   either T or a `T singleton'.  So, the following are all float
+   singletons:
+
+   struct { float x };
+   struct { struct { float x; } x; };
+   struct { struct { struct { float x; } x; } x; };
+
+   ... and so on.
+
+   All such structures are passed as if they were floats or doubles,
+   as the (revised) ABI says.  */
+static int
+is_float_singleton (struct type *type)
+{
+  if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
+    {
+      struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
+      CHECK_TYPEDEF (singleton_type);
+
+      return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
+	      || TYPE_CODE (singleton_type) == TYPE_CODE_DECFLOAT
+	      || is_float_singleton (singleton_type));
+    }
+
+  return 0;
+}
+
+
+/* Return non-zero if TYPE is a struct-like type, zero otherwise.
+   "Struct-like" types are those that should be passed as structs are:
+   structs and unions.
+
+   As an odd quirk, not mentioned in the ABI, GCC passes float and
+   double singletons as if they were a plain float, double, etc.  (The
+   corresponding union types are handled normally.)  So we exclude
+   those types here.  *shrug* */
+static int
+is_struct_like (struct type *type)
+{
+  enum type_code code = TYPE_CODE (type);
+
+  return (code == TYPE_CODE_UNION
+          || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type)));
+}
+
+
+/* Return non-zero if TYPE is a float-like type, zero otherwise.
+   "Float-like" types are those that should be passed as
+   floating-point values are.
+
+   You'd think this would just be floats, doubles, long doubles, etc.
+   But as an odd quirk, not mentioned in the ABI, GCC passes float and
+   double singletons as if they were a plain float, double, etc.  (The
+   corresponding union types are handled normally.)  So we include
+   those types here.  *shrug* */
+static int
+is_float_like (struct type *type)
+{
+  return (TYPE_CODE (type) == TYPE_CODE_FLT
+	  || TYPE_CODE (type) == TYPE_CODE_DECFLOAT
+          || is_float_singleton (type));
+}
+
+
+static int
+is_power_of_two (unsigned int n)
+{
+  return ((n & (n - 1)) == 0);
+}
+
+/* Return non-zero if TYPE should be passed as a pointer to a copy,
+   zero otherwise.  */
+static int
+s390_function_arg_pass_by_reference (struct type *type)
+{
+  if (TYPE_LENGTH (type) > 8)
+    return 1;
+
+  return (is_struct_like (type) && !is_power_of_two (TYPE_LENGTH (type)))
+	  || TYPE_CODE (type) == TYPE_CODE_COMPLEX
+	  || (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type));
+}
+
+/* Return non-zero if TYPE should be passed in a float register
+   if possible.  */
+static int
+s390_function_arg_float (struct type *type)
+{
+  if (TYPE_LENGTH (type) > 8)
+    return 0;
+
+  return is_float_like (type);
+}
+
+/* Return non-zero if TYPE should be passed in an integer register
+   (or a pair of integer registers) if possible.  */
+static int
+s390_function_arg_integer (struct type *type)
+{
+  if (TYPE_LENGTH (type) > 8)
+    return 0;
+
+   return is_integer_like (type)
+	  || is_pointer_like (type)
+	  || (is_struct_like (type) && is_power_of_two (TYPE_LENGTH (type)));
+}
+
+/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
+   word as required for the ABI.  */
+static LONGEST
+extend_simple_arg (struct gdbarch *gdbarch, struct value *arg)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  struct type *type = check_typedef (value_type (arg));
+
+  /* Even structs get passed in the least significant bits of the
+     register / memory word.  It's not really right to extract them as
+     an integer, but it does take care of the extension.  */
+  if (TYPE_UNSIGNED (type))
+    return extract_unsigned_integer (value_contents (arg),
+                                     TYPE_LENGTH (type), byte_order);
+  else
+    return extract_signed_integer (value_contents (arg),
+                                   TYPE_LENGTH (type), byte_order);
+}
+
+
+/* Return the alignment required by TYPE.  */
+static int
+alignment_of (struct type *type)
+{
+  int alignment;
+
+  if (is_integer_like (type)
+      || is_pointer_like (type)
+      || TYPE_CODE (type) == TYPE_CODE_FLT
+      || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+    alignment = TYPE_LENGTH (type);
+  else if (TYPE_CODE (type) == TYPE_CODE_STRUCT
+           || TYPE_CODE (type) == TYPE_CODE_UNION)
+    {
+      int i;
+
+      alignment = 1;
+      for (i = 0; i < TYPE_NFIELDS (type); i++)
+        {
+          int field_alignment
+	    = alignment_of (check_typedef (TYPE_FIELD_TYPE (type, i)));
+
+          if (field_alignment > alignment)
+            alignment = field_alignment;
+        }
+    }
+  else
+    alignment = 1;
+
+  /* Check that everything we ever return is a power of two.  Lots of
+     code doesn't want to deal with aligning things to arbitrary
+     boundaries.  */
+  gdb_assert ((alignment & (alignment - 1)) == 0);
+
+  return alignment;
+}
+
+
+/* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
+   place to be passed to a function, as specified by the "GNU/Linux
+   for S/390 ELF Application Binary Interface Supplement".
+
+   SP is the current stack pointer.  We must put arguments, links,
+   padding, etc. whereever they belong, and return the new stack
+   pointer value.
+   
+   If STRUCT_RETURN is non-zero, then the function we're calling is
+   going to return a structure by value; STRUCT_ADDR is the address of
+   a block we've allocated for it on the stack.
+
+   Our caller has taken care of any type promotions needed to satisfy
+   prototypes or the old K&R argument-passing rules.  */
+static CORE_ADDR
+s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+		      struct regcache *regcache, CORE_ADDR bp_addr,
+		      int nargs, struct value **args, CORE_ADDR sp,
+		      int struct_return, CORE_ADDR struct_addr)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  int i;
+
+  /* If the i'th argument is passed as a reference to a copy, then
+     copy_addr[i] is the address of the copy we made.  */
+  CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
+
+  /* Reserve space for the reference-to-copy area.  */
+  for (i = 0; i < nargs; i++)
+    {
+      struct value *arg = args[i];
+      struct type *type = check_typedef (value_type (arg));
+
+      if (s390_function_arg_pass_by_reference (type))
+        {
+          sp -= TYPE_LENGTH (type);
+          sp = align_down (sp, alignment_of (type));
+          copy_addr[i] = sp;
+        }
+    }
+
+  /* Reserve space for the parameter area.  As a conservative
+     simplification, we assume that everything will be passed on the
+     stack.  Since every argument larger than 8 bytes will be 
+     passed by reference, we use this simple upper bound.  */
+  sp -= nargs * 8;
+
+  /* After all that, make sure it's still aligned on an eight-byte
+     boundary.  */
+  sp = align_down (sp, 8);
+
+  /* Allocate the standard frame areas: the register save area, the
+     word reserved for the compiler (which seems kind of meaningless),
+     and the back chain pointer.  */
+  sp -= 16*word_size + 32;
+
+  /* Now we have the final SP value.  Make sure we didn't underflow;
+     on 31-bit, this would result in addresses with the high bit set,
+     which causes confusion elsewhere.  Note that if we error out
+     here, stack and registers remain untouched.  */
+  if (gdbarch_addr_bits_remove (gdbarch, sp) != sp)
+    error (_("Stack overflow"));
+
+
+  /* Finally, place the actual parameters, working from SP towards
+     higher addresses.  The code above is supposed to reserve enough
+     space for this.  */
+  {
+    int fr = 0;
+    int gr = 2;
+    CORE_ADDR starg = sp + 16*word_size + 32;
+
+    /* A struct is returned using general register 2.  */
+    if (struct_return)
+      {
+	regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+				        struct_addr);
+	gr++;
+      }
+
+    for (i = 0; i < nargs; i++)
+      {
+        struct value *arg = args[i];
+        struct type *type = check_typedef (value_type (arg));
+        unsigned length = TYPE_LENGTH (type);
+
+	if (s390_function_arg_pass_by_reference (type))
+	  {
+	    /* Actually copy the argument contents to the stack slot
+	       that was reserved above.  */
+	    write_memory (copy_addr[i], value_contents (arg), length);
+
+	    if (gr <= 6)
+	      {
+		regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+					        copy_addr[i]);
+		gr++;
+	      }
+	    else
+	      {
+		write_memory_unsigned_integer (starg, word_size, byte_order,
+					       copy_addr[i]);
+		starg += word_size;
+	      }
+	  }
+	else if (s390_function_arg_float (type))
+	  {
+	    /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
+	       the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6.  */
+	    if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
+	      {
+		/* When we store a single-precision value in an FP register,
+		   it occupies the leftmost bits.  */
+		regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
+					    0, length, value_contents (arg));
+		fr += 2;
+	      }
+	    else
+	      {
+		/* When we store a single-precision value in a stack slot,
+		   it occupies the rightmost bits.  */
+		starg = align_up (starg + length, word_size);
+                write_memory (starg - length, value_contents (arg), length);
+	      }
+	  }
+	else if (s390_function_arg_integer (type) && length <= word_size)
+	  {
+	    if (gr <= 6)
+	      {
+		/* Integer arguments are always extended to word size.  */
+		regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
+					      extend_simple_arg (gdbarch,
+								 arg));
+		gr++;
+	      }
+	    else
+	      {
+		/* Integer arguments are always extended to word size.  */
+		write_memory_signed_integer (starg, word_size, byte_order,
+                                             extend_simple_arg (gdbarch, arg));
+                starg += word_size;
+	      }
+	  }
+	else if (s390_function_arg_integer (type) && length == 2*word_size)
+	  {
+	    if (gr <= 5)
+	      {
+		regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
+				       value_contents (arg));
+		regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
+				       value_contents (arg) + word_size);
+		gr += 2;
+	      }
+	    else
+	      {
+		/* If we skipped r6 because we couldn't fit a DOUBLE_ARG
+		   in it, then don't go back and use it again later.  */
+		gr = 7;
+
+		write_memory (starg, value_contents (arg), length);
+		starg += length;
+	      }
+	  }
+	else
+	  internal_error (__FILE__, __LINE__, _("unknown argument type"));
+      }
+  }
+
+  /* Store return PSWA.  In 31-bit mode, keep addressing mode bit.  */
+  if (word_size == 4)
+    {
+      ULONGEST pswa;
+      regcache_cooked_read_unsigned (regcache, S390_PSWA_REGNUM, &pswa);
+      bp_addr = (bp_addr & 0x7fffffff) | (pswa & 0x80000000);
+    }
+  regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
+
+  /* Store updated stack pointer.  */
+  regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
+
+  /* We need to return the 'stack part' of the frame ID,
+     which is actually the top of the register save area.  */
+  return sp + 16*word_size + 32;
+}
+
+/* Assuming THIS_FRAME is a dummy, return the frame ID of that
+   dummy frame.  The frame ID's base needs to match the TOS value
+   returned by push_dummy_call, and the PC match the dummy frame's
+   breakpoint.  */
+static struct frame_id
+s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
+  sp = gdbarch_addr_bits_remove (gdbarch, sp);
+
+  return frame_id_build (sp + 16*word_size + 32,
+                         get_frame_pc (this_frame));
+}
+
+static CORE_ADDR
+s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+  /* Both the 32- and 64-bit ABI's say that the stack pointer should
+     always be aligned on an eight-byte boundary.  */
+  return (addr & -8);
+}
+
+
+/* Function return value access.  */
+
+static enum return_value_convention
+s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
+{
+  if (TYPE_LENGTH (type) > 8)
+    return RETURN_VALUE_STRUCT_CONVENTION;
+
+  switch (TYPE_CODE (type))
+    {
+    case TYPE_CODE_STRUCT:
+    case TYPE_CODE_UNION:
+    case TYPE_CODE_ARRAY:
+    case TYPE_CODE_COMPLEX:
+      return RETURN_VALUE_STRUCT_CONVENTION;
+
+    default:
+      return RETURN_VALUE_REGISTER_CONVENTION;
+    }
+}
+
+static enum return_value_convention
+s390_return_value (struct gdbarch *gdbarch, struct value *function,
+		   struct type *type, struct regcache *regcache,
+		   gdb_byte *out, const gdb_byte *in)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+  enum return_value_convention rvc;
+  int length;
+
+  type = check_typedef (type);
+  rvc = s390_return_value_convention (gdbarch, type);
+  length = TYPE_LENGTH (type);
+
+  if (in)
+    {
+      switch (rvc)
+	{
+	case RETURN_VALUE_REGISTER_CONVENTION:
+	  if (TYPE_CODE (type) == TYPE_CODE_FLT
+	      || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+	    {
+	      /* When we store a single-precision value in an FP register,
+		 it occupies the leftmost bits.  */
+	      regcache_cooked_write_part (regcache, S390_F0_REGNUM, 
+					  0, length, in);
+	    }
+	  else if (length <= word_size)
+	    {
+	      /* Integer arguments are always extended to word size.  */
+	      if (TYPE_UNSIGNED (type))
+		regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
+			extract_unsigned_integer (in, length, byte_order));
+	      else
+		regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
+			extract_signed_integer (in, length, byte_order));
+	    }
+	  else if (length == 2*word_size)
+	    {
+	      regcache_cooked_write (regcache, S390_R2_REGNUM, in);
+	      regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);
+	    }
+	  else
+	    internal_error (__FILE__, __LINE__, _("invalid return type"));
+	  break;
+
+	case RETURN_VALUE_STRUCT_CONVENTION:
+	  error (_("Cannot set function return value."));
+	  break;
+	}
+    }
+  else if (out)
+    {
+      switch (rvc)
+	{
+	case RETURN_VALUE_REGISTER_CONVENTION:
+	  if (TYPE_CODE (type) == TYPE_CODE_FLT
+	      || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+	    {
+	      /* When we store a single-precision value in an FP register,
+		 it occupies the leftmost bits.  */
+	      regcache_cooked_read_part (regcache, S390_F0_REGNUM, 
+					 0, length, out);
+	    }
+	  else if (length <= word_size)
+	    {
+	      /* Integer arguments occupy the rightmost bits.  */
+	      regcache_cooked_read_part (regcache, S390_R2_REGNUM, 
+					 word_size - length, length, out);
+	    }
+	  else if (length == 2*word_size)
+	    {
+	      regcache_cooked_read (regcache, S390_R2_REGNUM, out);
+	      regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);
+	    }
+	  else
+	    internal_error (__FILE__, __LINE__, _("invalid return type"));
+	  break;
+
+	case RETURN_VALUE_STRUCT_CONVENTION:
+	  error (_("Function return value unknown."));
+	  break;
+	}
+    }
+
+  return rvc;
+}
+
+
+/* Breakpoints.  */
+
+static const gdb_byte *
+s390_breakpoint_from_pc (struct gdbarch *gdbarch,
+			 CORE_ADDR *pcptr, int *lenptr)
+{
+  static const gdb_byte breakpoint[] = { 0x0, 0x1 };
+
+  *lenptr = sizeof (breakpoint);
+  return breakpoint;
+}
+
+
+/* Address handling.  */
+
+static CORE_ADDR
+s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
+{
+  return addr & 0x7fffffff;
+}
+
+static int
+s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
+{
+  if (byte_size == 4)
+    return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
+  else
+    return 0;
+}
+
+static const char *
+s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
+{
+  if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
+    return "mode32";
+  else
+    return NULL;
+}
+
+static int
+s390_address_class_name_to_type_flags (struct gdbarch *gdbarch,
+				       const char *name,
+				       int *type_flags_ptr)
+{
+  if (strcmp (name, "mode32") == 0)
+    {
+      *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
+      return 1;
+    }
+  else
+    return 0;
+}
+
+/* Implementation of `gdbarch_stap_is_single_operand', as defined in
+   gdbarch.h.  */
+
+static int
+s390_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
+{
+  return ((isdigit (*s) && s[1] == '(' && s[2] == '%') /* Displacement
+							  or indirection.  */
+	  || *s == '%' /* Register access.  */
+	  || isdigit (*s)); /* Literal number.  */
+}
+
+/* Set up gdbarch struct.  */
+
+static struct gdbarch *
+s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+  const struct target_desc *tdesc = info.target_desc;
+  struct tdesc_arch_data *tdesc_data = NULL;
+  struct gdbarch *gdbarch;
+  struct gdbarch_tdep *tdep;
+  int tdep_abi;
+  int have_upper = 0;
+  int have_linux_v1 = 0;
+  int have_linux_v2 = 0;
+  int first_pseudo_reg, last_pseudo_reg;
+
+  /* Default ABI and register size.  */
+  switch (info.bfd_arch_info->mach)
+    {
+    case bfd_mach_s390_31:
+      tdep_abi = ABI_LINUX_S390;
+      break;
+
+    case bfd_mach_s390_64:
+      tdep_abi = ABI_LINUX_ZSERIES;
+      break;
+
+    default:
+      return NULL;
+    }
+
+  /* Use default target description if none provided by the target.  */
+  if (!tdesc_has_registers (tdesc))
+    {
+      if (tdep_abi == ABI_LINUX_S390)
+	tdesc = tdesc_s390_linux32;
+      else
+	tdesc = tdesc_s390x_linux64;
+    }
+
+  /* Check any target description for validity.  */
+  if (tdesc_has_registers (tdesc))
+    {
+      static const char *const gprs[] = {
+	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
+      };
+      static const char *const fprs[] = {
+	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+	"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
+      };
+      static const char *const acrs[] = {
+	"acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
+	"acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15"
+      };
+      static const char *const gprs_lower[] = {
+	"r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l",
+	"r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
+      };
+      static const char *const gprs_upper[] = {
+	"r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
+	"r8h", "r9h", "r10h", "r11h", "r12h", "r13h", "r14h", "r15h"
+      };
+      static const char *const tdb_regs[] = {
+	"tdb0", "tac", "tct", "atia",
+	"tr0", "tr1", "tr2", "tr3", "tr4", "tr5", "tr6", "tr7",
+	"tr8", "tr9", "tr10", "tr11", "tr12", "tr13", "tr14", "tr15"
+      };
+      const struct tdesc_feature *feature;
+      int i, valid_p = 1;
+
+      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.core");
+      if (feature == NULL)
+	return NULL;
+
+      tdesc_data = tdesc_data_alloc ();
+
+      valid_p &= tdesc_numbered_register (feature, tdesc_data,
+					  S390_PSWM_REGNUM, "pswm");
+      valid_p &= tdesc_numbered_register (feature, tdesc_data,
+					  S390_PSWA_REGNUM, "pswa");
+
+      if (tdesc_unnumbered_register (feature, "r0"))
+	{
+	  for (i = 0; i < 16; i++)
+	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
+						S390_R0_REGNUM + i, gprs[i]);
+	}
+      else
+	{
+	  have_upper = 1;
+
+	  for (i = 0; i < 16; i++)
+	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
+						S390_R0_REGNUM + i,
+						gprs_lower[i]);
+	  for (i = 0; i < 16; i++)
+	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
+						S390_R0_UPPER_REGNUM + i,
+						gprs_upper[i]);
+	}
+
+      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.fpr");
+      if (feature == NULL)
+	{
+	  tdesc_data_cleanup (tdesc_data);
+	  return NULL;
+	}
+
+      valid_p &= tdesc_numbered_register (feature, tdesc_data,
+					  S390_FPC_REGNUM, "fpc");
+      for (i = 0; i < 16; i++)
+	valid_p &= tdesc_numbered_register (feature, tdesc_data,
+					    S390_F0_REGNUM + i, fprs[i]);
+
+      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.acr");
+      if (feature == NULL)
+	{
+	  tdesc_data_cleanup (tdesc_data);
+	  return NULL;
+	}
+
+      for (i = 0; i < 16; i++)
+	valid_p &= tdesc_numbered_register (feature, tdesc_data,
+					    S390_A0_REGNUM + i, acrs[i]);
+
+      /* Optional GNU/Linux-specific "registers".  */
+      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.linux");
+      if (feature)
+	{
+	  tdesc_numbered_register (feature, tdesc_data,
+				   S390_ORIG_R2_REGNUM, "orig_r2");
+
+	  if (tdesc_numbered_register (feature, tdesc_data,
+				       S390_LAST_BREAK_REGNUM, "last_break"))
+	    have_linux_v1 = 1;
+
+	  if (tdesc_numbered_register (feature, tdesc_data,
+				       S390_SYSTEM_CALL_REGNUM, "system_call"))
+	    have_linux_v2 = 1;
+
+	  if (have_linux_v2 > have_linux_v1)
+	    valid_p = 0;
+	}
+
+      /* Transaction diagnostic block.  */
+      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.tdb");
+      if (feature)
+	{
+	  for (i = 0; i < ARRAY_SIZE (tdb_regs); i++)
+	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
+						S390_TDB_DWORD0_REGNUM + i,
+						tdb_regs[i]);
+	}
+
+      if (!valid_p)
+	{
+	  tdesc_data_cleanup (tdesc_data);
+	  return NULL;
+	}
+    }
+
+  /* Find a candidate among extant architectures.  */
+  for (arches = gdbarch_list_lookup_by_info (arches, &info);
+       arches != NULL;
+       arches = gdbarch_list_lookup_by_info (arches->next, &info))
+    {
+      tdep = gdbarch_tdep (arches->gdbarch);
+      if (!tdep)
+	continue;
+      if (tdep->abi != tdep_abi)
+	continue;
+      if ((tdep->gpr_full_regnum != -1) != have_upper)
+	continue;
+      if (tdesc_data != NULL)
+	tdesc_data_cleanup (tdesc_data);
+      return arches->gdbarch;
+    }
+
+  /* Otherwise create a new gdbarch for the specified machine type.  */
+  tdep = XCALLOC (1, struct gdbarch_tdep);
+  tdep->abi = tdep_abi;
+  gdbarch = gdbarch_alloc (&info, tdep);
+
+  set_gdbarch_believe_pcc_promotion (gdbarch, 0);
+  set_gdbarch_char_signed (gdbarch, 0);
+
+  /* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
+     We can safely let them default to 128-bit, since the debug info
+     will give the size of type actually used in each case.  */
+  set_gdbarch_long_double_bit (gdbarch, 128);
+  set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
+
+  /* Amount PC must be decremented by after a breakpoint.  This is
+     often the number of bytes returned by gdbarch_breakpoint_from_pc but not
+     always.  */
+  set_gdbarch_decr_pc_after_break (gdbarch, 2);
+  /* Stack grows downward.  */
+  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+  set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
+  set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
+  set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
+
+  set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
+  set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
+  set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
+  set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+  set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
+  set_gdbarch_regset_from_core_section (gdbarch,
+                                        s390_regset_from_core_section);
+  set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
+  set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);
+  set_gdbarch_write_pc (gdbarch, s390_write_pc);
+  set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
+  set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
+  set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
+  set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
+  set_tdesc_pseudo_register_reggroup_p (gdbarch,
+                                        s390_pseudo_register_reggroup_p);
+  tdesc_use_registers (gdbarch, tdesc, tdesc_data);
+
+  /* Assign pseudo register numbers.  */
+  first_pseudo_reg = gdbarch_num_regs (gdbarch);
+  last_pseudo_reg = first_pseudo_reg;
+  tdep->gpr_full_regnum = -1;
+  if (have_upper)
+    {
+      tdep->gpr_full_regnum = last_pseudo_reg;
+      last_pseudo_reg += 16;
+    }
+  tdep->pc_regnum = last_pseudo_reg++;
+  tdep->cc_regnum = last_pseudo_reg++;
+  set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);
+  set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);
+
+  /* Inferior function calls.  */
+  set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
+  set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
+  set_gdbarch_frame_align (gdbarch, s390_frame_align);
+  set_gdbarch_return_value (gdbarch, s390_return_value);
+
+  /* Frame handling.  */
+  dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
+  dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
+  dwarf2_append_unwinders (gdbarch);
+  frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
+  frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
+  frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
+  frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
+  frame_base_set_default (gdbarch, &s390_frame_base);
+  set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
+  set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
+
+  /* Displaced stepping.  */
+  set_gdbarch_displaced_step_copy_insn (gdbarch,
+                                        simple_displaced_step_copy_insn);
+  set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
+  set_gdbarch_displaced_step_free_closure (gdbarch,
+                                           simple_displaced_step_free_closure);
+  set_gdbarch_displaced_step_location (gdbarch,
+                                       displaced_step_at_entry_point);
+  set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
+
+  /* Note that GNU/Linux is the only OS supported on this
+     platform.  */
+  linux_init_abi (info, gdbarch);
+
+  switch (tdep->abi)
+    {
+    case ABI_LINUX_S390:
+      tdep->gregset = &s390_gregset;
+      tdep->sizeof_gregset = s390_sizeof_gregset;
+      tdep->fpregset = &s390_fpregset;
+      tdep->sizeof_fpregset = s390_sizeof_fpregset;
+
+      set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
+      set_solib_svr4_fetch_link_map_offsets
+	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
+
+      if (have_upper)
+	{
+	  if (have_linux_v2)
+	    set_gdbarch_core_regset_sections (gdbarch,
+					      s390_linux64v2_regset_sections);
+	  else if (have_linux_v1)
+	    set_gdbarch_core_regset_sections (gdbarch,
+					      s390_linux64v1_regset_sections);
+	  else
+	    set_gdbarch_core_regset_sections (gdbarch,
+					      s390_linux64_regset_sections);
+	}
+      else
+	{
+	  if (have_linux_v2)
+	    set_gdbarch_core_regset_sections (gdbarch,
+					      s390_linux32v2_regset_sections);
+	  else if (have_linux_v1)
+	    set_gdbarch_core_regset_sections (gdbarch,
+					      s390_linux32v1_regset_sections);
+	  else
+	    set_gdbarch_core_regset_sections (gdbarch,
+					      s390_linux32_regset_sections);
+	}
+      break;
+
+    case ABI_LINUX_ZSERIES:
+      tdep->gregset = &s390x_gregset;
+      tdep->sizeof_gregset = s390x_sizeof_gregset;
+      tdep->fpregset = &s390_fpregset;
+      tdep->sizeof_fpregset = s390_sizeof_fpregset;
+
+      set_gdbarch_long_bit (gdbarch, 64);
+      set_gdbarch_long_long_bit (gdbarch, 64);
+      set_gdbarch_ptr_bit (gdbarch, 64);
+      set_solib_svr4_fetch_link_map_offsets
+	(gdbarch, svr4_lp64_fetch_link_map_offsets);
+      set_gdbarch_address_class_type_flags (gdbarch,
+                                            s390_address_class_type_flags);
+      set_gdbarch_address_class_type_flags_to_name (gdbarch,
+                                                    s390_address_class_type_flags_to_name);
+      set_gdbarch_address_class_name_to_type_flags (gdbarch,
+                                                    s390_address_class_name_to_type_flags);
+
+      if (have_linux_v2)
+	set_gdbarch_core_regset_sections (gdbarch,
+					  s390x_linux64v2_regset_sections);
+      else if (have_linux_v1)
+	set_gdbarch_core_regset_sections (gdbarch,
+					  s390x_linux64v1_regset_sections);
+      else
+	set_gdbarch_core_regset_sections (gdbarch,
+					  s390x_linux64_regset_sections);
+      break;
+    }
+
+  set_gdbarch_print_insn (gdbarch, print_insn_s390);
+
+  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+  /* Enable TLS support.  */
+  set_gdbarch_fetch_tls_load_module_address (gdbarch,
+                                             svr4_fetch_objfile_link_map);
+
+  set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
+
+  /* SystemTap functions.  */
+  set_gdbarch_stap_register_prefix (gdbarch, "%");
+  set_gdbarch_stap_register_indirection_prefix (gdbarch, "(");
+  set_gdbarch_stap_register_indirection_suffix (gdbarch, ")");
+  set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);
+
+  return gdbarch;
+}
+
+
+extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
+
+void
+_initialize_s390_tdep (void)
+{
+  /* Hook us into the gdbarch mechanism.  */
+  register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
+
+  /* Initialize the GNU/Linux target descriptions.  */
+  initialize_tdesc_s390_linux32 ();
+  initialize_tdesc_s390_linux32v1 ();
+  initialize_tdesc_s390_linux32v2 ();
+  initialize_tdesc_s390_linux64 ();
+  initialize_tdesc_s390_linux64v1 ();
+  initialize_tdesc_s390_linux64v2 ();
+  initialize_tdesc_s390_te_linux64 ();
+  initialize_tdesc_s390x_linux64 ();
+  initialize_tdesc_s390x_linux64v1 ();
+  initialize_tdesc_s390x_linux64v2 ();
+  initialize_tdesc_s390x_te_linux64 ();
+}
diff --git a/gdb/s390-linux-tdep.h b/gdb/s390-linux-tdep.h
new file mode 100644
index 0000000..69055e1
--- /dev/null
+++ b/gdb/s390-linux-tdep.h
@@ -0,0 +1,178 @@
+/* Target-dependent code for GDB, the GNU debugger.
+   Copyright (C) 2003-2013 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef S390_TDEP_H
+#define S390_TDEP_H
+
+/* Hardware capabilities. */
+
+#ifndef HWCAP_S390_HIGH_GPRS
+#define HWCAP_S390_HIGH_GPRS 512
+#endif
+
+#ifndef HWCAP_S390_TE
+#define HWCAP_S390_TE 1024
+#endif
+
+/* Register information.  */
+
+/* Program Status Word.  */
+#define S390_PSWM_REGNUM 0
+#define S390_PSWA_REGNUM 1
+/* General Purpose Registers.  */
+#define S390_R0_REGNUM 2
+#define S390_R1_REGNUM 3
+#define S390_R2_REGNUM 4
+#define S390_R3_REGNUM 5
+#define S390_R4_REGNUM 6
+#define S390_R5_REGNUM 7
+#define S390_R6_REGNUM 8
+#define S390_R7_REGNUM 9
+#define S390_R8_REGNUM 10
+#define S390_R9_REGNUM 11
+#define S390_R10_REGNUM 12
+#define S390_R11_REGNUM 13
+#define S390_R12_REGNUM 14
+#define S390_R13_REGNUM 15
+#define S390_R14_REGNUM 16
+#define S390_R15_REGNUM 17
+/* Access Registers.  */
+#define S390_A0_REGNUM 18
+#define S390_A1_REGNUM 19
+#define S390_A2_REGNUM 20
+#define S390_A3_REGNUM 21
+#define S390_A4_REGNUM 22
+#define S390_A5_REGNUM 23
+#define S390_A6_REGNUM 24
+#define S390_A7_REGNUM 25
+#define S390_A8_REGNUM 26
+#define S390_A9_REGNUM 27
+#define S390_A10_REGNUM 28
+#define S390_A11_REGNUM 29
+#define S390_A12_REGNUM 30
+#define S390_A13_REGNUM 31
+#define S390_A14_REGNUM 32
+#define S390_A15_REGNUM 33
+/* Floating Point Control Word.  */
+#define S390_FPC_REGNUM 34
+/* Floating Point Registers.  */
+#define S390_F0_REGNUM 35
+#define S390_F1_REGNUM 36
+#define S390_F2_REGNUM 37
+#define S390_F3_REGNUM 38
+#define S390_F4_REGNUM 39
+#define S390_F5_REGNUM 40
+#define S390_F6_REGNUM 41
+#define S390_F7_REGNUM 42
+#define S390_F8_REGNUM 43
+#define S390_F9_REGNUM 44
+#define S390_F10_REGNUM 45
+#define S390_F11_REGNUM 46
+#define S390_F12_REGNUM 47
+#define S390_F13_REGNUM 48
+#define S390_F14_REGNUM 49
+#define S390_F15_REGNUM 50
+/* General Purpose Register Upper Halves.  */
+#define S390_R0_UPPER_REGNUM 51
+#define S390_R1_UPPER_REGNUM 52
+#define S390_R2_UPPER_REGNUM 53
+#define S390_R3_UPPER_REGNUM 54
+#define S390_R4_UPPER_REGNUM 55
+#define S390_R5_UPPER_REGNUM 56
+#define S390_R6_UPPER_REGNUM 57
+#define S390_R7_UPPER_REGNUM 58
+#define S390_R8_UPPER_REGNUM 59
+#define S390_R9_UPPER_REGNUM 60
+#define S390_R10_UPPER_REGNUM 61
+#define S390_R11_UPPER_REGNUM 62
+#define S390_R12_UPPER_REGNUM 63
+#define S390_R13_UPPER_REGNUM 64
+#define S390_R14_UPPER_REGNUM 65
+#define S390_R15_UPPER_REGNUM 66
+/* GNU/Linux-specific optional registers.  */
+#define S390_ORIG_R2_REGNUM 67
+#define S390_LAST_BREAK_REGNUM 68
+#define S390_SYSTEM_CALL_REGNUM 69
+/* Transaction diagnostic block.  */
+#define S390_TDB_DWORD0_REGNUM 70
+#define S390_TDB_ABORT_CODE_REGNUM 71
+#define S390_TDB_CONFLICT_TOKEN_REGNUM 72
+#define S390_TDB_ATIA_REGNUM 73
+#define S390_TDB_R0_REGNUM 74
+#define S390_TDB_R1_REGNUM 75
+#define S390_TDB_R2_REGNUM 76
+#define S390_TDB_R3_REGNUM 77
+#define S390_TDB_R4_REGNUM 78
+#define S390_TDB_R5_REGNUM 79
+#define S390_TDB_R6_REGNUM 80
+#define S390_TDB_R7_REGNUM 81
+#define S390_TDB_R8_REGNUM 82
+#define S390_TDB_R9_REGNUM 83
+#define S390_TDB_R10_REGNUM 84
+#define S390_TDB_R11_REGNUM 85
+#define S390_TDB_R12_REGNUM 86
+#define S390_TDB_R13_REGNUM 87
+#define S390_TDB_R14_REGNUM 88
+#define S390_TDB_R15_REGNUM 89
+/* Total.  */
+#define S390_NUM_REGS 90
+
+/* Special register usage.  */
+#define S390_SP_REGNUM S390_R15_REGNUM
+#define S390_RETADDR_REGNUM S390_R14_REGNUM
+#define S390_FRAME_REGNUM S390_R11_REGNUM
+
+#define S390_IS_GREGSET_REGNUM(i)					\
+  (((i) >= S390_PSWM_REGNUM && (i) <= S390_A15_REGNUM)			\
+   || ((i) >= S390_R0_UPPER_REGNUM && (i) <= S390_R15_UPPER_REGNUM)	\
+   || (i) == S390_ORIG_R2_REGNUM)
+
+#define S390_IS_FPREGSET_REGNUM(i)			\
+  ((i) >= S390_FPC_REGNUM && (i) <= S390_F15_REGNUM)
+
+#define S390_IS_TDBREGSET_REGNUM(i)				\
+  ((i) >= S390_TDB_DWORD0_REGNUM && (i) <= S390_TDB_R15_REGNUM)
+
+/* Core file register sets, defined in s390-tdep.c.  */
+#define s390_sizeof_gregset 0x90
+extern const short s390_regmap_gregset[];
+#define s390x_sizeof_gregset 0xd8
+extern const short s390x_regmap_gregset[];
+#define s390_sizeof_fpregset 0x88
+extern const short s390_regmap_fpregset[];
+extern const short s390_regmap_last_break[];
+extern const short s390x_regmap_last_break[];
+extern const short s390_regmap_system_call[];
+extern const short s390_regmap_tdb[];
+#define s390_sizeof_tdbregset 0x100
+
+/* GNU/Linux target descriptions.  */
+extern struct target_desc *tdesc_s390_linux32;
+extern struct target_desc *tdesc_s390_linux32v1;
+extern struct target_desc *tdesc_s390_linux32v2;
+extern struct target_desc *tdesc_s390_linux64;
+extern struct target_desc *tdesc_s390_linux64v1;
+extern struct target_desc *tdesc_s390_linux64v2;
+extern struct target_desc *tdesc_s390_te_linux64;
+extern struct target_desc *tdesc_s390x_linux64;
+extern struct target_desc *tdesc_s390x_linux64v1;
+extern struct target_desc *tdesc_s390x_linux64v2;
+extern struct target_desc *tdesc_s390x_te_linux64;
+
+#endif
+
diff --git a/gdb/s390-nat.c b/gdb/s390-nat.c
deleted file mode 100644
index 19bc607..0000000
--- a/gdb/s390-nat.c
+++ /dev/null
@@ -1,695 +0,0 @@
-/* S390 native-dependent code for GDB, the GNU debugger.
-   Copyright (C) 2001-2013 Free Software Foundation, Inc.
-
-   Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
-   for IBM Deutschland Entwicklung GmbH, IBM Corporation.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include "defs.h"
-#include "regcache.h"
-#include "inferior.h"
-#include "target.h"
-#include "linux-nat.h"
-#include "auxv.h"
-#include "gregset.h"
-
-#include "s390-tdep.h"
-#include "elf/common.h"
-
-#include <asm/ptrace.h>
-#include <sys/ptrace.h>
-#include <asm/types.h>
-#include <sys/procfs.h>
-#include <sys/ucontext.h>
-#include <elf.h>
-
-#ifndef PTRACE_GETREGSET
-#define PTRACE_GETREGSET 0x4204
-#endif
-
-#ifndef PTRACE_SETREGSET
-#define PTRACE_SETREGSET 0x4205
-#endif
-
-static int have_regset_last_break = 0;
-static int have_regset_system_call = 0;
-static int have_regset_tdb = 0;
-
-/* Map registers to gregset/ptrace offsets.
-   These arrays are defined in s390-tdep.c.  */
-
-#ifdef __s390x__
-#define regmap_gregset s390x_regmap_gregset
-#else
-#define regmap_gregset s390_regmap_gregset
-#endif
-
-#define regmap_fpregset s390_regmap_fpregset
-
-/* Fill the regset described by MAP into REGCACHE, using the values
-   from REGP.  The MAP array represents each register as a pair
-   (offset, regno) of short integers and is terminated with -1. */
-
-static void
-s390_native_supply (struct regcache *regcache, const short *map,
-		    const gdb_byte *regp)
-{
-  for (; map[0] >= 0; map += 2)
-    regcache_raw_supply (regcache, map[1], regp ? regp + map[0] : NULL);
-}
-
-/* Collect the register REGNO out of the regset described by MAP from
-   REGCACHE into REGP.  If REGNO == -1, do this for all registers in
-   this regset. */
-
-static void
-s390_native_collect (const struct regcache *regcache, const short *map,
-		     int regno, gdb_byte *regp)
-{
-  for (; map[0] >= 0; map += 2)
-    if (regno == -1 || regno == map[1])
-      regcache_raw_collect (regcache, map[1], regp + map[0]);
-}
-
-/* Fill GDB's register array with the general-purpose register values
-   in *REGP.
-
-   When debugging a 32-bit executable running under a 64-bit kernel,
-   we have to fix up the 64-bit registers we get from the kernel to
-   make them look like 32-bit registers.  */
-
-void
-supply_gregset (struct regcache *regcache, const gregset_t *regp)
-{
-#ifdef __s390x__
-  struct gdbarch *gdbarch = get_regcache_arch (regcache);
-  if (gdbarch_ptr_bit (gdbarch) == 32)
-    {
-      enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-      ULONGEST pswm = 0, pswa = 0;
-      gdb_byte buf[4];
-      const short *map;
-
-      for (map = regmap_gregset; map[0] >= 0; map += 2)
-	{
-	  const gdb_byte *p = (const gdb_byte *) regp + map[0];
-	  int regno = map[1];
-
-	  if (regno == S390_PSWM_REGNUM)
-	    pswm = extract_unsigned_integer (p, 8, byte_order);
-	  else if (regno == S390_PSWA_REGNUM)
-	    pswa = extract_unsigned_integer (p, 8, byte_order);
-	  else
-	    {
-	      if ((regno >= S390_R0_REGNUM && regno <= S390_R15_REGNUM)
-		  || regno == S390_ORIG_R2_REGNUM)
-		p += 4;
-	      regcache_raw_supply (regcache, regno, p);
-	    }
-	}
-
-      store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000);
-      regcache_raw_supply (regcache, S390_PSWM_REGNUM, buf);
-      store_unsigned_integer (buf, 4, byte_order,
-			      (pswa & 0x7fffffff) | (pswm & 0x80000000));
-      regcache_raw_supply (regcache, S390_PSWA_REGNUM, buf);
-      return;
-    }
-#endif
-
-  s390_native_supply (regcache, regmap_gregset, (const gdb_byte *) regp);
-}
-
-/* Fill register REGNO (if it is a general-purpose register) in
-   *REGP with the value in GDB's register array.  If REGNO is -1,
-   do this for all registers.  */
-
-void
-fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
-{
-#ifdef __s390x__
-  struct gdbarch *gdbarch = get_regcache_arch (regcache);
-  if (gdbarch_ptr_bit (gdbarch) == 32)
-    {
-      gdb_byte *psw_p[2];
-      const short *map;
-
-      for (map = regmap_gregset; map[0] >= 0; map += 2)
-	{
-	  gdb_byte *p = (gdb_byte *) regp + map[0];
-	  int reg = map[1];
-
-	  if (reg >= S390_PSWM_REGNUM && reg <= S390_PSWA_REGNUM)
-	    psw_p[reg - S390_PSWM_REGNUM] = p;
-
-	  else if (regno == -1 || regno == reg)
-	    {
-	      if ((reg >= S390_R0_REGNUM && reg <= S390_R15_REGNUM)
-		  || reg == S390_ORIG_R2_REGNUM)
-		{
-		  memset (p, 0, 4);
-		  p += 4;
-		}
-	      regcache_raw_collect (regcache, reg, p + 4);
-	    }
-	}
-
-      if (regno == -1
-	  || regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM)
-	{
-	  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-	  ULONGEST pswa, pswm;
-	  gdb_byte buf[4];
-
-	  regcache_raw_collect (regcache, S390_PSWM_REGNUM, buf);
-	  pswm = extract_unsigned_integer (buf, 4, byte_order);
-	  regcache_raw_collect (regcache, S390_PSWA_REGNUM, buf);
-	  pswa = extract_unsigned_integer (buf, 4, byte_order);
-
-	  if (regno == -1 || regno == S390_PSWM_REGNUM)
-	    store_unsigned_integer (psw_p[0], 8, byte_order,
-				    ((pswm & 0xfff7ffff) << 32) |
-				    (pswa & 0x80000000));
-	  if (regno == -1 || regno == S390_PSWA_REGNUM)
-	    store_unsigned_integer (psw_p[1], 8, byte_order,
-				    pswa & 0x7fffffff);
-	}
-      return;
-    }
-#endif
-
-  s390_native_collect (regcache, regmap_gregset, regno, (gdb_byte *) regp);
-}
-
-/* Fill GDB's register array with the floating-point register values
-   in *REGP.  */
-void
-supply_fpregset (struct regcache *regcache, const fpregset_t *regp)
-{
-  s390_native_supply (regcache, regmap_fpregset, (const gdb_byte *) regp);
-}
-
-/* Fill register REGNO (if it is a general-purpose register) in
-   *REGP with the value in GDB's register array.  If REGNO is -1,
-   do this for all registers.  */
-void
-fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno)
-{
-  s390_native_collect (regcache, regmap_fpregset, regno, (gdb_byte *) regp);
-}
-
-/* Find the TID for the current inferior thread to use with ptrace.  */
-static int
-s390_inferior_tid (void)
-{
-  /* GNU/Linux LWP ID's are process ID's.  */
-  int tid = ptid_get_lwp (inferior_ptid);
-  if (tid == 0)
-    tid = ptid_get_pid (inferior_ptid); /* Not a threaded program.  */
-
-  return tid;
-}
-
-/* Fetch all general-purpose registers from process/thread TID and
-   store their values in GDB's register cache.  */
-static void
-fetch_regs (struct regcache *regcache, int tid)
-{
-  gregset_t regs;
-  ptrace_area parea;
-
-  parea.len = sizeof (regs);
-  parea.process_addr = (addr_t) &regs;
-  parea.kernel_addr = offsetof (struct user_regs_struct, psw);
-  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
-    perror_with_name (_("Couldn't get registers"));
-
-  supply_gregset (regcache, (const gregset_t *) &regs);
-}
-
-/* Store all valid general-purpose registers in GDB's register cache
-   into the process/thread specified by TID.  */
-static void
-store_regs (const struct regcache *regcache, int tid, int regnum)
-{
-  gregset_t regs;
-  ptrace_area parea;
-
-  parea.len = sizeof (regs);
-  parea.process_addr = (addr_t) &regs;
-  parea.kernel_addr = offsetof (struct user_regs_struct, psw);
-  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
-    perror_with_name (_("Couldn't get registers"));
-
-  fill_gregset (regcache, &regs, regnum);
-
-  if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
-    perror_with_name (_("Couldn't write registers"));
-}
-
-/* Fetch all floating-point registers from process/thread TID and store
-   their values in GDB's register cache.  */
-static void
-fetch_fpregs (struct regcache *regcache, int tid)
-{
-  fpregset_t fpregs;
-  ptrace_area parea;
-
-  parea.len = sizeof (fpregs);
-  parea.process_addr = (addr_t) &fpregs;
-  parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
-  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
-    perror_with_name (_("Couldn't get floating point status"));
-
-  supply_fpregset (regcache, (const fpregset_t *) &fpregs);
-}
-
-/* Store all valid floating-point registers in GDB's register cache
-   into the process/thread specified by TID.  */
-static void
-store_fpregs (const struct regcache *regcache, int tid, int regnum)
-{
-  fpregset_t fpregs;
-  ptrace_area parea;
-
-  parea.len = sizeof (fpregs);
-  parea.process_addr = (addr_t) &fpregs;
-  parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
-  if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea) < 0)
-    perror_with_name (_("Couldn't get floating point status"));
-
-  fill_fpregset (regcache, &fpregs, regnum);
-
-  if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea) < 0)
-    perror_with_name (_("Couldn't write floating point status"));
-}
-
-/* Fetch all registers in the kernel's register set whose number is REGSET,
-   whose size is REGSIZE, and whose layout is described by REGMAP, from
-   process/thread TID and store their values in GDB's register cache.  */
-static void
-fetch_regset (struct regcache *regcache, int tid,
-	      int regset, int regsize, const short *regmap)
-{
-  gdb_byte *buf = alloca (regsize);
-  struct iovec iov;
-
-  iov.iov_base = buf;
-  iov.iov_len = regsize;
-
-  if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) < 0)
-    {
-      if (errno == ENODATA)
-	s390_native_supply (regcache, regmap, NULL);
-      else
-	perror_with_name (_("Couldn't get register set"));
-    }
-  else
-    s390_native_supply (regcache, regmap, buf);
-}
-
-/* Store all registers in the kernel's register set whose number is REGSET,
-   whose size is REGSIZE, and whose layout is described by REGMAP, from
-   GDB's register cache back to process/thread TID.  */
-static void
-store_regset (struct regcache *regcache, int tid,
-	      int regset, int regsize, const short *regmap)
-{
-  gdb_byte *buf = alloca (regsize);
-  struct iovec iov;
-
-  iov.iov_base = buf;
-  iov.iov_len = regsize;
-
-  if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) < 0)
-    perror_with_name (_("Couldn't get register set"));
-
-  s390_native_collect (regcache, regmap, -1, buf);
-
-  if (ptrace (PTRACE_SETREGSET, tid, (long) regset, (long) &iov) < 0)
-    perror_with_name (_("Couldn't set register set"));
-}
-
-/* Check whether the kernel provides a register set with number REGSET
-   of size REGSIZE for process/thread TID.  */
-static int
-check_regset (int tid, int regset, int regsize)
-{
-  gdb_byte *buf = alloca (regsize);
-  struct iovec iov;
-
-  iov.iov_base = buf;
-  iov.iov_len = regsize;
-
-  if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0
-      || errno == ENODATA)
-    return 1;
-  return 0;
-}
-
-/* Fetch register REGNUM from the child process.  If REGNUM is -1, do
-   this for all registers.  */
-static void
-s390_linux_fetch_inferior_registers (struct target_ops *ops,
-				     struct regcache *regcache, int regnum)
-{
-  int tid = s390_inferior_tid ();
-
-  if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
-    fetch_regs (regcache, tid);
-
-  if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
-    fetch_fpregs (regcache, tid);
-
-  if (have_regset_last_break)
-    if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM)
-      fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8,
-		    (gdbarch_ptr_bit (get_regcache_arch (regcache)) == 32
-		     ? s390_regmap_last_break : s390x_regmap_last_break));
-
-  if (have_regset_system_call)
-    if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
-      fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
-		    s390_regmap_system_call);
-
-  if (have_regset_tdb)
-    if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum))
-      fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset,
-		    s390_regmap_tdb);
-}
-
-/* Store register REGNUM back into the child process.  If REGNUM is
-   -1, do this for all registers.  */
-static void
-s390_linux_store_inferior_registers (struct target_ops *ops,
-				     struct regcache *regcache, int regnum)
-{
-  int tid = s390_inferior_tid ();
-
-  if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
-    store_regs (regcache, tid, regnum);
-
-  if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
-    store_fpregs (regcache, tid, regnum);
-
-  /* S390_LAST_BREAK_REGNUM is read-only.  */
-
-  if (have_regset_system_call)
-    if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
-      store_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
-		    s390_regmap_system_call);
-}
-
-
-/* Hardware-assisted watchpoint handling.  */
-
-/* We maintain a list of all currently active watchpoints in order
-   to properly handle watchpoint removal.
-
-   The only thing we actually need is the total address space area
-   spanned by the watchpoints.  */
-
-struct watch_area
-{
-  struct watch_area *next;
-  CORE_ADDR lo_addr;
-  CORE_ADDR hi_addr;
-};
-
-static struct watch_area *watch_base = NULL;
-
-static int
-s390_stopped_by_watchpoint (void)
-{
-  per_lowcore_bits per_lowcore;
-  ptrace_area parea;
-  int result;
-
-  /* Speed up common case.  */
-  if (!watch_base)
-    return 0;
-
-  parea.len = sizeof (per_lowcore);
-  parea.process_addr = (addr_t) & per_lowcore;
-  parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
-  if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea) < 0)
-    perror_with_name (_("Couldn't retrieve watchpoint status"));
-
-  result = (per_lowcore.perc_storage_alteration == 1
-	    && per_lowcore.perc_store_real_address == 0);
-
-  if (result)
-    {
-      /* Do not report this watchpoint again.  */
-      memset (&per_lowcore, 0, sizeof (per_lowcore));
-      if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea) < 0)
-	perror_with_name (_("Couldn't clear watchpoint status"));
-    }
-
-  return result;
-}
-
-static void
-s390_fix_watch_points (struct lwp_info *lp)
-{
-  int tid;
-
-  per_struct per_info;
-  ptrace_area parea;
-
-  CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0;
-  struct watch_area *area;
-
-  tid = ptid_get_lwp (lp->ptid);
-  if (tid == 0)
-    tid = ptid_get_pid (lp->ptid);
-
-  for (area = watch_base; area; area = area->next)
-    {
-      watch_lo_addr = min (watch_lo_addr, area->lo_addr);
-      watch_hi_addr = max (watch_hi_addr, area->hi_addr);
-    }
-
-  parea.len = sizeof (per_info);
-  parea.process_addr = (addr_t) & per_info;
-  parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
-  if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea) < 0)
-    perror_with_name (_("Couldn't retrieve watchpoint status"));
-
-  if (watch_base)
-    {
-      per_info.control_regs.bits.em_storage_alteration = 1;
-      per_info.control_regs.bits.storage_alt_space_ctl = 1;
-    }
-  else
-    {
-      per_info.control_regs.bits.em_storage_alteration = 0;
-      per_info.control_regs.bits.storage_alt_space_ctl = 0;
-    }
-  per_info.starting_addr = watch_lo_addr;
-  per_info.ending_addr = watch_hi_addr;
-
-  if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea) < 0)
-    perror_with_name (_("Couldn't modify watchpoint status"));
-}
-
-static int
-s390_insert_watchpoint (CORE_ADDR addr, int len, int type,
-			struct expression *cond)
-{
-  struct lwp_info *lp;
-  struct watch_area *area = xmalloc (sizeof (struct watch_area));
-
-  if (!area)
-    return -1; 
-
-  area->lo_addr = addr;
-  area->hi_addr = addr + len - 1;
- 
-  area->next = watch_base;
-  watch_base = area;
-
-  ALL_LWPS (lp)
-    s390_fix_watch_points (lp);
-  return 0;
-}
-
-static int
-s390_remove_watchpoint (CORE_ADDR addr, int len, int type,
-			struct expression *cond)
-{
-  struct lwp_info *lp;
-  struct watch_area *area, **parea;
-
-  for (parea = &watch_base; *parea; parea = &(*parea)->next)
-    if ((*parea)->lo_addr == addr
-	&& (*parea)->hi_addr == addr + len - 1)
-      break;
-
-  if (!*parea)
-    {
-      fprintf_unfiltered (gdb_stderr,
-			  "Attempt to remove nonexistent watchpoint.\n");
-      return -1;
-    }
-
-  area = *parea;
-  *parea = area->next;
-  xfree (area);
-
-  ALL_LWPS (lp)
-    s390_fix_watch_points (lp);
-  return 0;
-}
-
-static int
-s390_can_use_hw_breakpoint (int type, int cnt, int othertype)
-{
-  return type == bp_hardware_watchpoint;
-}
-
-static int
-s390_region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
-{
-  return 1;
-}
-
-static int
-s390_target_wordsize (void)
-{
-  int wordsize = 4;
-
-  /* Check for 64-bit inferior process.  This is the case when the host is
-     64-bit, and in addition bit 32 of the PSW mask is set.  */
-#ifdef __s390x__
-  long pswm;
-
-  errno = 0;
-  pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0);
-  if (errno == 0 && (pswm & 0x100000000ul) != 0)
-    wordsize = 8;
-#endif
-
-  return wordsize;
-}
-
-static int
-s390_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
-		 gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
-{
-  int sizeof_auxv_field = s390_target_wordsize ();
-  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
-  gdb_byte *ptr = *readptr;
-
-  if (endptr == ptr)
-    return 0;
-
-  if (endptr - ptr < sizeof_auxv_field * 2)
-    return -1;
-
-  *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
-  ptr += sizeof_auxv_field;
-  *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
-  ptr += sizeof_auxv_field;
-
-  *readptr = ptr;
-  return 1;
-}
-
-#ifdef __s390x__
-static unsigned long
-s390_get_hwcap (void)
-{
-  CORE_ADDR field;
-
-  if (target_auxv_search (&current_target, AT_HWCAP, &field))
-    return (unsigned long) field;
-
-  return 0;
-}
-#endif
-
-static const struct target_desc *
-s390_read_description (struct target_ops *ops)
-{
-  int tid = s390_inferior_tid ();
-
-  have_regset_last_break
-    = check_regset (tid, NT_S390_LAST_BREAK, 8);
-  have_regset_system_call
-    = check_regset (tid, NT_S390_SYSTEM_CALL, 4);
-  have_regset_tdb
-    = check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset);
-
-#ifdef __s390x__
-  /* If GDB itself is compiled as 64-bit, we are running on a machine in
-     z/Architecture mode.  If the target is running in 64-bit addressing
-     mode, report s390x architecture.  If the target is running in 31-bit
-     addressing mode, but the kernel supports using 64-bit registers in
-     that mode, report s390 architecture with 64-bit GPRs.  */
-
-  if (s390_target_wordsize () == 8)
-    return (have_regset_tdb ? tdesc_s390x_te_linux64 :
-	    have_regset_system_call? tdesc_s390x_linux64v2 :
-	    have_regset_last_break? tdesc_s390x_linux64v1 :
-	    tdesc_s390x_linux64);
-
-  if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
-    return (have_regset_tdb ? tdesc_s390_te_linux64 :
-	    have_regset_system_call? tdesc_s390_linux64v2 :
-	    have_regset_last_break? tdesc_s390_linux64v1 :
-	    tdesc_s390_linux64);
-#endif
-
-  /* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior
-     on a 64-bit kernel that does not support using 64-bit registers in 31-bit
-     mode, report s390 architecture with 32-bit GPRs.  */
-  return (have_regset_system_call? tdesc_s390_linux32v2 :
-	  have_regset_last_break? tdesc_s390_linux32v1 :
-	  tdesc_s390_linux32);
-}
-
-void _initialize_s390_nat (void);
-
-void
-_initialize_s390_nat (void)
-{
-  struct target_ops *t;
-
-  /* Fill in the generic GNU/Linux methods.  */
-  t = linux_target ();
-
-  /* Add our register access methods.  */
-  t->to_fetch_registers = s390_linux_fetch_inferior_registers;
-  t->to_store_registers = s390_linux_store_inferior_registers;
-
-  /* Add our watchpoint methods.  */
-  t->to_can_use_hw_breakpoint = s390_can_use_hw_breakpoint;
-  t->to_region_ok_for_hw_watchpoint = s390_region_ok_for_hw_watchpoint;
-  t->to_have_continuable_watchpoint = 1;
-  t->to_stopped_by_watchpoint = s390_stopped_by_watchpoint;
-  t->to_insert_watchpoint = s390_insert_watchpoint;
-  t->to_remove_watchpoint = s390_remove_watchpoint;
-
-  /* Detect target architecture.  */
-  t->to_read_description = s390_read_description;
-  t->to_auxv_parse = s390_auxv_parse;
-
-  /* Register the target.  */
-  linux_nat_add_target (t);
-  linux_nat_set_new_thread (t, s390_fix_watch_points);
-}
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
deleted file mode 100644
index 091d82a..0000000
--- a/gdb/s390-tdep.c
+++ /dev/null
@@ -1,3390 +0,0 @@
-/* Target-dependent code for GDB, the GNU debugger.
-
-   Copyright (C) 2001-2013 Free Software Foundation, Inc.
-
-   Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
-   for IBM Deutschland Entwicklung GmbH, IBM Corporation.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include "defs.h"
-#include "arch-utils.h"
-#include "frame.h"
-#include "inferior.h"
-#include "symtab.h"
-#include "target.h"
-#include "gdbcore.h"
-#include "gdbcmd.h"
-#include "objfiles.h"
-#include "floatformat.h"
-#include "regcache.h"
-#include "trad-frame.h"
-#include "frame-base.h"
-#include "frame-unwind.h"
-#include "dwarf2-frame.h"
-#include "reggroups.h"
-#include "regset.h"
-#include "value.h"
-#include "gdb_assert.h"
-#include "dis-asm.h"
-#include "solib-svr4.h"
-#include "prologue-value.h"
-#include "linux-tdep.h"
-#include "s390-tdep.h"
-#include "auxv.h"
-
-#include "stap-probe.h"
-#include "ax.h"
-#include "ax-gdb.h"
-#include "user-regs.h"
-#include "cli/cli-utils.h"
-#include <ctype.h>
-#include "elf/common.h"
-
-#include "features/s390-linux32.c"
-#include "features/s390-linux32v1.c"
-#include "features/s390-linux32v2.c"
-#include "features/s390-linux64.c"
-#include "features/s390-linux64v1.c"
-#include "features/s390-linux64v2.c"
-#include "features/s390-te-linux64.c"
-#include "features/s390x-linux64.c"
-#include "features/s390x-linux64v1.c"
-#include "features/s390x-linux64v2.c"
-#include "features/s390x-te-linux64.c"
-
-/* The tdep structure.  */
-
-struct gdbarch_tdep
-{
-  /* ABI version.  */
-  enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
-
-  /* Pseudo register numbers.  */
-  int gpr_full_regnum;
-  int pc_regnum;
-  int cc_regnum;
-
-  /* Core file register sets.  */
-  const struct regset *gregset;
-  int sizeof_gregset;
-
-  const struct regset *fpregset;
-  int sizeof_fpregset;
-};
-
-
-/* ABI call-saved register information.  */
-
-static int
-s390_register_call_saved (struct gdbarch *gdbarch, int regnum)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  switch (tdep->abi)
-    {
-    case ABI_LINUX_S390:
-      if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
-	  || regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM
-	  || regnum == S390_A0_REGNUM)
-	return 1;
-
-      break;
-
-    case ABI_LINUX_ZSERIES:
-      if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
-	  || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)
-	  || (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))
-	return 1;
-
-      break;
-    }
-
-  return 0;
-}
-
-static int
-s390_cannot_store_register (struct gdbarch *gdbarch, int regnum)
-{
-  /* The last-break address is read-only.  */
-  return regnum == S390_LAST_BREAK_REGNUM;
-}
-
-static void
-s390_write_pc (struct regcache *regcache, CORE_ADDR pc)
-{
-  struct gdbarch *gdbarch = get_regcache_arch (regcache);
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
-
-  /* Set special SYSTEM_CALL register to 0 to prevent the kernel from
-     messing with the PC we just installed, if we happen to be within
-     an interrupted system call that the kernel wants to restart.
-
-     Note that after we return from the dummy call, the SYSTEM_CALL and
-     ORIG_R2 registers will be automatically restored, and the kernel
-     continues to restart the system call at this point.  */
-  if (register_size (gdbarch, S390_SYSTEM_CALL_REGNUM) > 0)
-    regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);
-}
-
-
-/* DWARF Register Mapping.  */
-
-static const short s390_dwarf_regmap[] =
-{
-  /* General Purpose Registers.  */
-  S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
-  S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
-  S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
-  S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
-
-  /* Floating Point Registers.  */
-  S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
-  S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
-  S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
-  S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
-
-  /* Control Registers (not mapped).  */
-  -1, -1, -1, -1, -1, -1, -1, -1, 
-  -1, -1, -1, -1, -1, -1, -1, -1, 
-
-  /* Access Registers.  */
-  S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
-  S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
-  S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
-  S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
-
-  /* Program Status Word.  */
-  S390_PSWM_REGNUM,
-  S390_PSWA_REGNUM,
-
-  /* GPR Lower Half Access.  */
-  S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
-  S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
-  S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
-  S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
-
-  /* GNU/Linux-specific registers (not mapped).  */
-  -1, -1, -1,
-};
-
-/* Convert DWARF register number REG to the appropriate register
-   number used by GDB.  */
-static int
-s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  /* In a 32-on-64 debug scenario, debug info refers to the full 64-bit
-     GPRs.  Note that call frame information still refers to the 32-bit
-     lower halves, because s390_adjust_frame_regnum uses register numbers
-     66 .. 81 to access GPRs.  */
-  if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
-    return tdep->gpr_full_regnum + reg;
-
-  if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
-    return s390_dwarf_regmap[reg];
-
-  warning (_("Unmapped DWARF Register #%d encountered."), reg);
-  return -1;
-}
-
-/* Translate a .eh_frame register to DWARF register, or adjust a
-   .debug_frame register.  */
-static int
-s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
-{
-  /* See s390_dwarf_reg_to_regnum for comments.  */
-  return (num >= 0 && num < 16)? num + 66 : num;
-}
-
-
-/* Pseudo registers.  */
-
-static int
-regnum_is_gpr_full (struct gdbarch_tdep *tdep, int regnum)
-{
-  return (tdep->gpr_full_regnum != -1
-	  && regnum >= tdep->gpr_full_regnum
-	  && regnum <= tdep->gpr_full_regnum + 15);
-}
-
-static const char *
-s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  if (regnum == tdep->pc_regnum)
-    return "pc";
-
-  if (regnum == tdep->cc_regnum)
-    return "cc";
-
-  if (regnum_is_gpr_full (tdep, regnum))
-    {
-      static const char *full_name[] = {
-	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
-	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
-      };
-      return full_name[regnum - tdep->gpr_full_regnum];
-    }
-
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
-
-static struct type *
-s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  if (regnum == tdep->pc_regnum)
-    return builtin_type (gdbarch)->builtin_func_ptr;
-
-  if (regnum == tdep->cc_regnum)
-    return builtin_type (gdbarch)->builtin_int;
-
-  if (regnum_is_gpr_full (tdep, regnum))
-    return builtin_type (gdbarch)->builtin_uint64;
-
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
-
-static enum register_status
-s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
-			   int regnum, gdb_byte *buf)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  int regsize = register_size (gdbarch, regnum);
-  ULONGEST val;
-
-  if (regnum == tdep->pc_regnum)
-    {
-      enum register_status status;
-
-      status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
-      if (status == REG_VALID)
-	{
-	  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	    val &= 0x7fffffff;
-	  store_unsigned_integer (buf, regsize, byte_order, val);
-	}
-      return status;
-    }
-
-  if (regnum == tdep->cc_regnum)
-    {
-      enum register_status status;
-
-      status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
-      if (status == REG_VALID)
-	{
-	  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	    val = (val >> 12) & 3;
-	  else
-	    val = (val >> 44) & 3;
-	  store_unsigned_integer (buf, regsize, byte_order, val);
-	}
-      return status;
-    }
-
-  if (regnum_is_gpr_full (tdep, regnum))
-    {
-      enum register_status status;
-      ULONGEST val_upper;
-
-      regnum -= tdep->gpr_full_regnum;
-
-      status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
-      if (status == REG_VALID)
-	status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
-					     &val_upper);
-      if (status == REG_VALID)
-	{
-	  val |= val_upper << 32;
-	  store_unsigned_integer (buf, regsize, byte_order, val);
-	}
-      return status;
-    }
-
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
-
-static void
-s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
-			    int regnum, const gdb_byte *buf)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  int regsize = register_size (gdbarch, regnum);
-  ULONGEST val, psw;
-
-  if (regnum == tdep->pc_regnum)
-    {
-      val = extract_unsigned_integer (buf, regsize, byte_order);
-      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	{
-	  regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
-	  val = (psw & 0x80000000) | (val & 0x7fffffff);
-	}
-      regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);
-      return;
-    }
-
-  if (regnum == tdep->cc_regnum)
-    {
-      val = extract_unsigned_integer (buf, regsize, byte_order);
-      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
-      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
-      else
-	val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
-      regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);
-      return;
-    }
-
-  if (regnum_is_gpr_full (tdep, regnum))
-    {
-      regnum -= tdep->gpr_full_regnum;
-      val = extract_unsigned_integer (buf, regsize, byte_order);
-      regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,
-				   val & 0xffffffff);
-      regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
-				   val >> 32);
-      return;
-    }
-
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
-
-/* 'float' values are stored in the upper half of floating-point
-   registers, even though we are otherwise a big-endian platform.  */
-
-static struct value *
-s390_value_from_register (struct type *type, int regnum,
-			  struct frame_info *frame)
-{
-  struct value *value = default_value_from_register (type, regnum, frame);
-
-  check_typedef (type);
-
-  if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
-      && TYPE_LENGTH (type) < 8)
-    set_value_offset (value, 0);
-
-  return value;
-}
-
-/* Register groups.  */
-
-static int
-s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
-				 struct reggroup *group)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  /* We usually save/restore the whole PSW, which includes PC and CC.
-     However, some older gdbservers may not support saving/restoring
-     the whole PSW yet, and will return an XML register description
-     excluding those from the save/restore register groups.  In those
-     cases, we still need to explicitly save/restore PC and CC in order
-     to push or pop frames.  Since this doesn't hurt anything if we
-     already save/restore the whole PSW (it's just redundant), we add
-     PC and CC at this point unconditionally.  */
-  if (group == save_reggroup || group == restore_reggroup)
-    return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;
-
-  return default_register_reggroup_p (gdbarch, regnum, group);
-}
-
-
-/* Maps for register sets.  */
-
-const short s390_regmap_gregset[] =
-  {
-    0x00, S390_PSWM_REGNUM,
-    0x04, S390_PSWA_REGNUM,
-    0x08, S390_R0_REGNUM,
-    0x0c, S390_R1_REGNUM,
-    0x10, S390_R2_REGNUM,
-    0x14, S390_R3_REGNUM,
-    0x18, S390_R4_REGNUM,
-    0x1c, S390_R5_REGNUM,
-    0x20, S390_R6_REGNUM,
-    0x24, S390_R7_REGNUM,
-    0x28, S390_R8_REGNUM,
-    0x2c, S390_R9_REGNUM,
-    0x30, S390_R10_REGNUM,
-    0x34, S390_R11_REGNUM,
-    0x38, S390_R12_REGNUM,
-    0x3c, S390_R13_REGNUM,
-    0x40, S390_R14_REGNUM,
-    0x44, S390_R15_REGNUM,
-    0x48, S390_A0_REGNUM,
-    0x4c, S390_A1_REGNUM,
-    0x50, S390_A2_REGNUM,
-    0x54, S390_A3_REGNUM,
-    0x58, S390_A4_REGNUM,
-    0x5c, S390_A5_REGNUM,
-    0x60, S390_A6_REGNUM,
-    0x64, S390_A7_REGNUM,
-    0x68, S390_A8_REGNUM,
-    0x6c, S390_A9_REGNUM,
-    0x70, S390_A10_REGNUM,
-    0x74, S390_A11_REGNUM,
-    0x78, S390_A12_REGNUM,
-    0x7c, S390_A13_REGNUM,
-    0x80, S390_A14_REGNUM,
-    0x84, S390_A15_REGNUM,
-    0x88, S390_ORIG_R2_REGNUM,
-    -1, -1
-  };
-
-const short s390x_regmap_gregset[] =
-  {
-    0x00, S390_PSWM_REGNUM,
-    0x08, S390_PSWA_REGNUM,
-    0x10, S390_R0_REGNUM,
-    0x18, S390_R1_REGNUM,
-    0x20, S390_R2_REGNUM,
-    0x28, S390_R3_REGNUM,
-    0x30, S390_R4_REGNUM,
-    0x38, S390_R5_REGNUM,
-    0x40, S390_R6_REGNUM,
-    0x48, S390_R7_REGNUM,
-    0x50, S390_R8_REGNUM,
-    0x58, S390_R9_REGNUM,
-    0x60, S390_R10_REGNUM,
-    0x68, S390_R11_REGNUM,
-    0x70, S390_R12_REGNUM,
-    0x78, S390_R13_REGNUM,
-    0x80, S390_R14_REGNUM,
-    0x88, S390_R15_REGNUM,
-    0x90, S390_A0_REGNUM,
-    0x94, S390_A1_REGNUM,
-    0x98, S390_A2_REGNUM,
-    0x9c, S390_A3_REGNUM,
-    0xa0, S390_A4_REGNUM,
-    0xa4, S390_A5_REGNUM,
-    0xa8, S390_A6_REGNUM,
-    0xac, S390_A7_REGNUM,
-    0xb0, S390_A8_REGNUM,
-    0xb4, S390_A9_REGNUM,
-    0xb8, S390_A10_REGNUM,
-    0xbc, S390_A11_REGNUM,
-    0xc0, S390_A12_REGNUM,
-    0xc4, S390_A13_REGNUM,
-    0xc8, S390_A14_REGNUM,
-    0xcc, S390_A15_REGNUM,
-    0x10, S390_R0_UPPER_REGNUM,
-    0x18, S390_R1_UPPER_REGNUM,
-    0x20, S390_R2_UPPER_REGNUM,
-    0x28, S390_R3_UPPER_REGNUM,
-    0x30, S390_R4_UPPER_REGNUM,
-    0x38, S390_R5_UPPER_REGNUM,
-    0x40, S390_R6_UPPER_REGNUM,
-    0x48, S390_R7_UPPER_REGNUM,
-    0x50, S390_R8_UPPER_REGNUM,
-    0x58, S390_R9_UPPER_REGNUM,
-    0x60, S390_R10_UPPER_REGNUM,
-    0x68, S390_R11_UPPER_REGNUM,
-    0x70, S390_R12_UPPER_REGNUM,
-    0x78, S390_R13_UPPER_REGNUM,
-    0x80, S390_R14_UPPER_REGNUM,
-    0x88, S390_R15_UPPER_REGNUM,
-    0xd0, S390_ORIG_R2_REGNUM,
-    -1, -1
-  };
-
-const short s390_regmap_fpregset[] =
-  {
-    0x00, S390_FPC_REGNUM,
-    0x08, S390_F0_REGNUM,
-    0x10, S390_F1_REGNUM,
-    0x18, S390_F2_REGNUM,
-    0x20, S390_F3_REGNUM,
-    0x28, S390_F4_REGNUM,
-    0x30, S390_F5_REGNUM,
-    0x38, S390_F6_REGNUM,
-    0x40, S390_F7_REGNUM,
-    0x48, S390_F8_REGNUM,
-    0x50, S390_F9_REGNUM,
-    0x58, S390_F10_REGNUM,
-    0x60, S390_F11_REGNUM,
-    0x68, S390_F12_REGNUM,
-    0x70, S390_F13_REGNUM,
-    0x78, S390_F14_REGNUM,
-    0x80, S390_F15_REGNUM,
-    -1, -1
-  };
-
-const short s390_regmap_upper[] =
-  {
-    0x00, S390_R0_UPPER_REGNUM,
-    0x04, S390_R1_UPPER_REGNUM,
-    0x08, S390_R2_UPPER_REGNUM,
-    0x0c, S390_R3_UPPER_REGNUM,
-    0x10, S390_R4_UPPER_REGNUM,
-    0x14, S390_R5_UPPER_REGNUM,
-    0x18, S390_R6_UPPER_REGNUM,
-    0x1c, S390_R7_UPPER_REGNUM,
-    0x20, S390_R8_UPPER_REGNUM,
-    0x24, S390_R9_UPPER_REGNUM,
-    0x28, S390_R10_UPPER_REGNUM,
-    0x2c, S390_R11_UPPER_REGNUM,
-    0x30, S390_R12_UPPER_REGNUM,
-    0x34, S390_R13_UPPER_REGNUM,
-    0x38, S390_R14_UPPER_REGNUM,
-    0x3c, S390_R15_UPPER_REGNUM,
-    -1, -1
-  };
-
-const short s390_regmap_last_break[] =
-  {
-    0x04, S390_LAST_BREAK_REGNUM,
-    -1, -1
-  };
-
-const short s390x_regmap_last_break[] =
-  {
-    0x00, S390_LAST_BREAK_REGNUM,
-    -1, -1
-  };
-
-const short s390_regmap_system_call[] =
-  {
-    0x00, S390_SYSTEM_CALL_REGNUM,
-    -1, -1
-  };
-
-const short s390_regmap_tdb[] =
-  {
-    0x00, S390_TDB_DWORD0_REGNUM,
-    0x08, S390_TDB_ABORT_CODE_REGNUM,
-    0x10, S390_TDB_CONFLICT_TOKEN_REGNUM,
-    0x18, S390_TDB_ATIA_REGNUM,
-    0x80, S390_TDB_R0_REGNUM,
-    0x88, S390_TDB_R1_REGNUM,
-    0x90, S390_TDB_R2_REGNUM,
-    0x98, S390_TDB_R3_REGNUM,
-    0xa0, S390_TDB_R4_REGNUM,
-    0xa8, S390_TDB_R5_REGNUM,
-    0xb0, S390_TDB_R6_REGNUM,
-    0xb8, S390_TDB_R7_REGNUM,
-    0xc0, S390_TDB_R8_REGNUM,
-    0xc8, S390_TDB_R9_REGNUM,
-    0xd0, S390_TDB_R10_REGNUM,
-    0xd8, S390_TDB_R11_REGNUM,
-    0xe0, S390_TDB_R12_REGNUM,
-    0xe8, S390_TDB_R13_REGNUM,
-    0xf0, S390_TDB_R14_REGNUM,
-    0xf8, S390_TDB_R15_REGNUM,
-    -1, -1
-  };
-
-
-/* Supply register REGNUM from the register set REGSET to register cache 
-   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
-static void
-s390_supply_regset (const struct regset *regset, struct regcache *regcache,
-		    int regnum, const void *regs, size_t len)
-{
-  const short *map;
-  for (map = regset->descr; map[0] >= 0; map += 2)
-    if (regnum == -1 || regnum == map[1])
-      regcache_raw_supply (regcache, map[1],
-			   regs ? (const char *)regs + map[0] : NULL);
-}
-
-/* Supply the TDB regset.  Like s390_supply_regset, but invalidate the
-   TDB registers unless the TDB format field is valid.  */
-
-static void
-s390_supply_tdb_regset (const struct regset *regset, struct regcache *regcache,
-		    int regnum, const void *regs, size_t len)
-{
-  ULONGEST tdw;
-  enum register_status ret;
-  int i;
-
-  s390_supply_regset (regset, regcache, regnum, regs, len);
-  ret = regcache_cooked_read_unsigned (regcache, S390_TDB_DWORD0_REGNUM, &tdw);
-  if (ret != REG_VALID || (tdw >> 56) != 1)
-    s390_supply_regset (regset, regcache, regnum, NULL, len);
-}
-
-/* Collect register REGNUM from the register cache REGCACHE and store
-   it in the buffer specified by REGS and LEN as described by the
-   general-purpose register set REGSET.  If REGNUM is -1, do this for
-   all registers in REGSET.  */
-static void
-s390_collect_regset (const struct regset *regset,
-		     const struct regcache *regcache,
-		     int regnum, void *regs, size_t len)
-{
-  const short *map;
-  for (map = regset->descr; map[0] >= 0; map += 2)
-    if (regnum == -1 || regnum == map[1])
-      regcache_raw_collect (regcache, map[1], (char *)regs + map[0]);
-}
-
-static const struct regset s390_gregset = {
-  s390_regmap_gregset, 
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390x_gregset = {
-  s390x_regmap_gregset, 
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390_fpregset = {
-  s390_regmap_fpregset, 
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390_upper_regset = {
-  s390_regmap_upper, 
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390_last_break_regset = {
-  s390_regmap_last_break,
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390x_last_break_regset = {
-  s390x_regmap_last_break,
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390_system_call_regset = {
-  s390_regmap_system_call,
-  s390_supply_regset,
-  s390_collect_regset
-};
-
-static const struct regset s390_tdb_regset = {
-  s390_regmap_tdb,
-  s390_supply_tdb_regset,
-  s390_collect_regset
-};
-
-static struct core_regset_section s390_linux32_regset_sections[] =
-{
-  { ".reg", s390_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390_linux32v1_regset_sections[] =
-{
-  { ".reg", s390_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-last-break", 8, "s390 last-break address" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390_linux32v2_regset_sections[] =
-{
-  { ".reg", s390_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-last-break", 8, "s390 last-break address" },
-  { ".reg-s390-system-call", 4, "s390 system-call" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390_linux64_regset_sections[] =
-{
-  { ".reg", s390_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390_linux64v1_regset_sections[] =
-{
-  { ".reg", s390_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
-  { ".reg-s390-last-break", 8, "s930 last-break address" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390_linux64v2_regset_sections[] =
-{
-  { ".reg", s390_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },
-  { ".reg-s390-last-break", 8, "s930 last-break address" },
-  { ".reg-s390-system-call", 4, "s390 system-call" },
-  { ".reg-s390-tdb", s390_sizeof_tdbregset, "s390 TDB" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390x_linux64_regset_sections[] =
-{
-  { ".reg", s390x_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390x_linux64v1_regset_sections[] =
-{
-  { ".reg", s390x_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-last-break", 8, "s930 last-break address" },
-  { NULL, 0}
-};
-
-static struct core_regset_section s390x_linux64v2_regset_sections[] =
-{
-  { ".reg", s390x_sizeof_gregset, "general-purpose" },
-  { ".reg2", s390_sizeof_fpregset, "floating-point" },
-  { ".reg-s390-last-break", 8, "s930 last-break address" },
-  { ".reg-s390-system-call", 4, "s390 system-call" },
-  { ".reg-s390-tdb", s390_sizeof_tdbregset, "s390 TDB" },
-  { NULL, 0}
-};
-
-
-/* Return the appropriate register set for the core section identified
-   by SECT_NAME and SECT_SIZE.  */
-static const struct regset *
-s390_regset_from_core_section (struct gdbarch *gdbarch,
-			       const char *sect_name, size_t sect_size)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)
-    return tdep->gregset;
-
-  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)
-    return tdep->fpregset;
-
-  if (strcmp (sect_name, ".reg-s390-high-gprs") == 0 && sect_size >= 16*4)
-    return &s390_upper_regset;
-
-  if (strcmp (sect_name, ".reg-s390-last-break") == 0 && sect_size >= 8)
-    return (gdbarch_ptr_bit (gdbarch) == 32
-	    ?  &s390_last_break_regset : &s390x_last_break_regset);
-
-  if (strcmp (sect_name, ".reg-s390-system-call") == 0 && sect_size >= 4)
-    return &s390_system_call_regset;
-
-  if (strcmp (sect_name, ".reg-s390-tdb") == 0 && sect_size >= 256)
-    return &s390_tdb_regset;
-
-  return NULL;
-}
-
-static const struct target_desc *
-s390_core_read_description (struct gdbarch *gdbarch,
-			    struct target_ops *target, bfd *abfd)
-{
-  asection *high_gprs = bfd_get_section_by_name (abfd, ".reg-s390-high-gprs");
-  asection *v1 = bfd_get_section_by_name (abfd, ".reg-s390-last-break");
-  asection *v2 = bfd_get_section_by_name (abfd, ".reg-s390-system-call");
-  asection *section = bfd_get_section_by_name (abfd, ".reg");
-  CORE_ADDR hwcap = 0;
-
-  target_auxv_search (target, AT_HWCAP, &hwcap);
-  if (!section)
-    return NULL;
-
-  switch (bfd_section_size (abfd, section))
-    {
-    case s390_sizeof_gregset:
-      if (high_gprs)
-	return ((hwcap & HWCAP_S390_TE) ? tdesc_s390_te_linux64 :
-		v2? tdesc_s390_linux64v2 :
-		v1? tdesc_s390_linux64v1 : tdesc_s390_linux64);
-      else
-	return (v2? tdesc_s390_linux32v2 :
-		v1? tdesc_s390_linux32v1 : tdesc_s390_linux32);
-
-    case s390x_sizeof_gregset:
-      return ((hwcap & HWCAP_S390_TE) ? tdesc_s390x_te_linux64 :
-	      v2? tdesc_s390x_linux64v2 :
-	      v1? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);
-
-    default:
-      return NULL;
-    }
-}
-
-
-/* Decoding S/390 instructions.  */
-
-/* Named opcode values for the S/390 instructions we recognize.  Some
-   instructions have their opcode split across two fields; those are the
-   op1_* and op2_* enums.  */
-enum
-  {
-    op1_lhi  = 0xa7,   op2_lhi  = 0x08,
-    op1_lghi = 0xa7,   op2_lghi = 0x09,
-    op1_lgfi = 0xc0,   op2_lgfi = 0x01,
-    op_lr    = 0x18,
-    op_lgr   = 0xb904,
-    op_l     = 0x58,
-    op1_ly   = 0xe3,   op2_ly   = 0x58,
-    op1_lg   = 0xe3,   op2_lg   = 0x04,
-    op_lm    = 0x98,
-    op1_lmy  = 0xeb,   op2_lmy  = 0x98,
-    op1_lmg  = 0xeb,   op2_lmg  = 0x04,
-    op_st    = 0x50,
-    op1_sty  = 0xe3,   op2_sty  = 0x50,
-    op1_stg  = 0xe3,   op2_stg  = 0x24,
-    op_std   = 0x60,
-    op_stm   = 0x90,
-    op1_stmy = 0xeb,   op2_stmy = 0x90,
-    op1_stmg = 0xeb,   op2_stmg = 0x24,
-    op1_aghi = 0xa7,   op2_aghi = 0x0b,
-    op1_ahi  = 0xa7,   op2_ahi  = 0x0a,
-    op1_agfi = 0xc2,   op2_agfi = 0x08,
-    op1_afi  = 0xc2,   op2_afi  = 0x09,
-    op1_algfi= 0xc2,   op2_algfi= 0x0a,
-    op1_alfi = 0xc2,   op2_alfi = 0x0b,
-    op_ar    = 0x1a,
-    op_agr   = 0xb908,
-    op_a     = 0x5a,
-    op1_ay   = 0xe3,   op2_ay   = 0x5a,
-    op1_ag   = 0xe3,   op2_ag   = 0x08,
-    op1_slgfi= 0xc2,   op2_slgfi= 0x04,
-    op1_slfi = 0xc2,   op2_slfi = 0x05,
-    op_sr    = 0x1b,
-    op_sgr   = 0xb909,
-    op_s     = 0x5b,
-    op1_sy   = 0xe3,   op2_sy   = 0x5b,
-    op1_sg   = 0xe3,   op2_sg   = 0x09,
-    op_nr    = 0x14,
-    op_ngr   = 0xb980,
-    op_la    = 0x41,
-    op1_lay  = 0xe3,   op2_lay  = 0x71,
-    op1_larl = 0xc0,   op2_larl = 0x00,
-    op_basr  = 0x0d,
-    op_bas   = 0x4d,
-    op_bcr   = 0x07,
-    op_bc    = 0x0d,
-    op_bctr  = 0x06,
-    op_bctgr = 0xb946,
-    op_bct   = 0x46,
-    op1_bctg = 0xe3,   op2_bctg = 0x46,
-    op_bxh   = 0x86,
-    op1_bxhg = 0xeb,   op2_bxhg = 0x44,
-    op_bxle  = 0x87,
-    op1_bxleg= 0xeb,   op2_bxleg= 0x45,
-    op1_bras = 0xa7,   op2_bras = 0x05,
-    op1_brasl= 0xc0,   op2_brasl= 0x05,
-    op1_brc  = 0xa7,   op2_brc  = 0x04,
-    op1_brcl = 0xc0,   op2_brcl = 0x04,
-    op1_brct = 0xa7,   op2_brct = 0x06,
-    op1_brctg= 0xa7,   op2_brctg= 0x07,
-    op_brxh  = 0x84,
-    op1_brxhg= 0xec,   op2_brxhg= 0x44,
-    op_brxle = 0x85,
-    op1_brxlg= 0xec,   op2_brxlg= 0x45,
-  };
-
-
-/* Read a single instruction from address AT.  */
-
-#define S390_MAX_INSTR_SIZE 6
-static int
-s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
-{
-  static int s390_instrlen[] = { 2, 4, 4, 6 };
-  int instrlen;
-
-  if (target_read_memory (at, &instr[0], 2))
-    return -1;
-  instrlen = s390_instrlen[instr[0] >> 6];
-  if (instrlen > 2)
-    {
-      if (target_read_memory (at + 2, &instr[2], instrlen - 2))
-        return -1;
-    }
-  return instrlen;
-}
-
-
-/* The functions below are for recognizing and decoding S/390
-   instructions of various formats.  Each of them checks whether INSN
-   is an instruction of the given format, with the specified opcodes.
-   If it is, it sets the remaining arguments to the values of the
-   instruction's fields, and returns a non-zero value; otherwise, it
-   returns zero.
-
-   These functions' arguments appear in the order they appear in the
-   instruction, not in the machine-language form.  So, opcodes always
-   come first, even though they're sometimes scattered around the
-   instructions.  And displacements appear before base and extension
-   registers, as they do in the assembly syntax, not at the end, as
-   they do in the machine language.  */
-static int
-is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
-{
-  if (insn[0] == op1 && (insn[1] & 0xf) == op2)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      /* i2 is a 16-bit signed quantity.  */
-      *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_ril (bfd_byte *insn, int op1, int op2,
-        unsigned int *r1, int *i2)
-{
-  if (insn[0] == op1 && (insn[1] & 0xf) == op2)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      /* i2 is a signed quantity.  If the host 'int' is 32 bits long,
-         no sign extension is necessary, but we don't want to assume
-         that.  */
-      *i2 = (((insn[2] << 24)
-              | (insn[3] << 16)
-              | (insn[4] << 8)
-              | (insn[5])) ^ 0x80000000) - 0x80000000;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
-{
-  if (insn[0] == op)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *r2 = insn[1] & 0xf;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
-{
-  if (((insn[0] << 8) | insn[1]) == op)
-    {
-      /* Yes, insn[3].  insn[2] is unused in RRE format.  */
-      *r1 = (insn[3] >> 4) & 0xf;
-      *r2 = insn[3] & 0xf;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rs (bfd_byte *insn, int op,
-       unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
-{
-  if (insn[0] == op)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *r3 = insn[1] & 0xf;
-      *b2 = (insn[2] >> 4) & 0xf;
-      *d2 = ((insn[2] & 0xf) << 8) | insn[3];
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rsy (bfd_byte *insn, int op1, int op2,
-        unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
-{
-  if (insn[0] == op1
-      && insn[5] == op2)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *r3 = insn[1] & 0xf;
-      *b2 = (insn[2] >> 4) & 0xf;
-      /* The 'long displacement' is a 20-bit signed integer.  */
-      *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12)) 
-		^ 0x80000) - 0x80000;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rsi (bfd_byte *insn, int op,
-        unsigned int *r1, unsigned int *r3, int *i2)
-{
-  if (insn[0] == op)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *r3 = insn[1] & 0xf;
-      /* i2 is a 16-bit signed quantity.  */
-      *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rie (bfd_byte *insn, int op1, int op2,
-        unsigned int *r1, unsigned int *r3, int *i2)
-{
-  if (insn[0] == op1
-      && insn[5] == op2)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *r3 = insn[1] & 0xf;
-      /* i2 is a 16-bit signed quantity.  */
-      *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rx (bfd_byte *insn, int op,
-       unsigned int *r1, int *d2, unsigned int *x2, unsigned int *b2)
-{
-  if (insn[0] == op)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *x2 = insn[1] & 0xf;
-      *b2 = (insn[2] >> 4) & 0xf;
-      *d2 = ((insn[2] & 0xf) << 8) | insn[3];
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-static int
-is_rxy (bfd_byte *insn, int op1, int op2,
-        unsigned int *r1, int *d2, unsigned int *x2, unsigned int *b2)
-{
-  if (insn[0] == op1
-      && insn[5] == op2)
-    {
-      *r1 = (insn[1] >> 4) & 0xf;
-      *x2 = insn[1] & 0xf;
-      *b2 = (insn[2] >> 4) & 0xf;
-      /* The 'long displacement' is a 20-bit signed integer.  */
-      *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12)) 
-		^ 0x80000) - 0x80000;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-
-/* Prologue analysis.  */
-
-#define S390_NUM_GPRS 16
-#define S390_NUM_FPRS 16
-
-struct s390_prologue_data {
-
-  /* The stack.  */
-  struct pv_area *stack;
-
-  /* The size and byte-order of a GPR or FPR.  */
-  int gpr_size;
-  int fpr_size;
-  enum bfd_endian byte_order;
-
-  /* The general-purpose registers.  */
-  pv_t gpr[S390_NUM_GPRS];
-
-  /* The floating-point registers.  */
-  pv_t fpr[S390_NUM_FPRS];
-
-  /* The offset relative to the CFA where the incoming GPR N was saved
-     by the function prologue.  0 if not saved or unknown.  */
-  int gpr_slot[S390_NUM_GPRS];
-
-  /* Likewise for FPRs.  */
-  int fpr_slot[S390_NUM_FPRS];
-
-  /* Nonzero if the backchain was saved.  This is assumed to be the
-     case when the incoming SP is saved at the current SP location.  */
-  int back_chain_saved_p;
-};
-
-/* Return the effective address for an X-style instruction, like:
-
-        L R1, D2(X2, B2)
-
-   Here, X2 and B2 are registers, and D2 is a signed 20-bit
-   constant; the effective address is the sum of all three.  If either
-   X2 or B2 are zero, then it doesn't contribute to the sum --- this
-   means that r0 can't be used as either X2 or B2.  */
-static pv_t
-s390_addr (struct s390_prologue_data *data,
-	   int d2, unsigned int x2, unsigned int b2)
-{
-  pv_t result;
-
-  result = pv_constant (d2);
-  if (x2)
-    result = pv_add (result, data->gpr[x2]);
-  if (b2)
-    result = pv_add (result, data->gpr[b2]);
-
-  return result;
-}
-
-/* Do a SIZE-byte store of VALUE to D2(X2,B2).  */
-static void
-s390_store (struct s390_prologue_data *data,
-	    int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
-	    pv_t value)
-{
-  pv_t addr = s390_addr (data, d2, x2, b2);
-  pv_t offset;
-
-  /* Check whether we are storing the backchain.  */
-  offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
-
-  if (pv_is_constant (offset) && offset.k == 0)
-    if (size == data->gpr_size
-	&& pv_is_register_k (value, S390_SP_REGNUM, 0))
-      {
-	data->back_chain_saved_p = 1;
-	return;
-      }
-
-
-  /* Check whether we are storing a register into the stack.  */
-  if (!pv_area_store_would_trash (data->stack, addr))
-    pv_area_store (data->stack, addr, size, value);
-
-
-  /* Note: If this is some store we cannot identify, you might think we
-     should forget our cached values, as any of those might have been hit.
-
-     However, we make the assumption that the register save areas are only
-     ever stored to once in any given function, and we do recognize these
-     stores.  Thus every store we cannot recognize does not hit our data.  */
-}
-
-/* Do a SIZE-byte load from D2(X2,B2).  */
-static pv_t
-s390_load (struct s390_prologue_data *data,
-	   int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
-	   
-{
-  pv_t addr = s390_addr (data, d2, x2, b2);
-
-  /* If it's a load from an in-line constant pool, then we can
-     simulate that, under the assumption that the code isn't
-     going to change between the time the processor actually
-     executed it creating the current frame, and the time when
-     we're analyzing the code to unwind past that frame.  */
-  if (pv_is_constant (addr))
-    {
-      struct target_section *secp;
-      secp = target_section_by_addr (&current_target, addr.k);
-      if (secp != NULL
-          && (bfd_get_section_flags (secp->the_bfd_section->owner,
-				     secp->the_bfd_section)
-              & SEC_READONLY))
-        return pv_constant (read_memory_integer (addr.k, size,
-						 data->byte_order));
-    }
-
-  /* Check whether we are accessing one of our save slots.  */
-  return pv_area_fetch (data->stack, addr, size);
-}
-
-/* Function for finding saved registers in a 'struct pv_area'; we pass
-   this to pv_area_scan.
-
-   If VALUE is a saved register, ADDR says it was saved at a constant
-   offset from the frame base, and SIZE indicates that the whole
-   register was saved, record its offset in the reg_offset table in
-   PROLOGUE_UNTYPED.  */
-static void
-s390_check_for_saved (void *data_untyped, pv_t addr,
-		      CORE_ADDR size, pv_t value)
-{
-  struct s390_prologue_data *data = data_untyped;
-  int i, offset;
-
-  if (!pv_is_register (addr, S390_SP_REGNUM))
-    return;
-
-  offset = 16 * data->gpr_size + 32 - addr.k;
-
-  /* If we are storing the original value of a register, we want to
-     record the CFA offset.  If the same register is stored multiple
-     times, the stack slot with the highest address counts.  */
- 
-  for (i = 0; i < S390_NUM_GPRS; i++)
-    if (size == data->gpr_size
-	&& pv_is_register_k (value, S390_R0_REGNUM + i, 0))
-      if (data->gpr_slot[i] == 0
-	  || data->gpr_slot[i] > offset)
-	{
-	  data->gpr_slot[i] = offset;
-	  return;
-	}
-
-  for (i = 0; i < S390_NUM_FPRS; i++)
-    if (size == data->fpr_size
-	&& pv_is_register_k (value, S390_F0_REGNUM + i, 0))
-      if (data->fpr_slot[i] == 0
-	  || data->fpr_slot[i] > offset)
-	{
-	  data->fpr_slot[i] = offset;
-	  return;
-	}
-}
-
-/* Analyze the prologue of the function starting at START_PC,
-   continuing at most until CURRENT_PC.  Initialize DATA to
-   hold all information we find out about the state of the registers
-   and stack slots.  Return the address of the instruction after
-   the last one that changed the SP, FP, or back chain; or zero
-   on error.  */
-static CORE_ADDR
-s390_analyze_prologue (struct gdbarch *gdbarch,
-		       CORE_ADDR start_pc,
-		       CORE_ADDR current_pc,
-		       struct s390_prologue_data *data)
-{
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-
-  /* Our return value:
-     The address of the instruction after the last one that changed
-     the SP, FP, or back chain;  zero if we got an error trying to 
-     read memory.  */
-  CORE_ADDR result = start_pc;
-
-  /* The current PC for our abstract interpretation.  */
-  CORE_ADDR pc;
-
-  /* The address of the next instruction after that.  */
-  CORE_ADDR next_pc;
-  
-  /* Set up everything's initial value.  */
-  {
-    int i;
-
-    data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
-
-    /* For the purpose of prologue tracking, we consider the GPR size to
-       be equal to the ABI word size, even if it is actually larger
-       (i.e. when running a 32-bit binary under a 64-bit kernel).  */
-    data->gpr_size = word_size;
-    data->fpr_size = 8;
-    data->byte_order = gdbarch_byte_order (gdbarch);
-
-    for (i = 0; i < S390_NUM_GPRS; i++)
-      data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
-
-    for (i = 0; i < S390_NUM_FPRS; i++)
-      data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
-
-    for (i = 0; i < S390_NUM_GPRS; i++)
-      data->gpr_slot[i]  = 0;
-
-    for (i = 0; i < S390_NUM_FPRS; i++)
-      data->fpr_slot[i]  = 0;
-
-    data->back_chain_saved_p = 0;
-  }
-
-  /* Start interpreting instructions, until we hit the frame's
-     current PC or the first branch instruction.  */
-  for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
-    {
-      bfd_byte insn[S390_MAX_INSTR_SIZE];
-      int insn_len = s390_readinstruction (insn, pc);
-
-      bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
-      bfd_byte *insn32 = word_size == 4 ? insn : dummy;
-      bfd_byte *insn64 = word_size == 8 ? insn : dummy;
-
-      /* Fields for various kinds of instructions.  */
-      unsigned int b2, r1, r2, x2, r3;
-      int i2, d2;
-
-      /* The values of SP and FP before this instruction,
-         for detecting instructions that change them.  */
-      pv_t pre_insn_sp, pre_insn_fp;
-      /* Likewise for the flag whether the back chain was saved.  */
-      int pre_insn_back_chain_saved_p;
-
-      /* If we got an error trying to read the instruction, report it.  */
-      if (insn_len < 0)
-        {
-          result = 0;
-          break;
-        }
-
-      next_pc = pc + insn_len;
-
-      pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
-      pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
-      pre_insn_back_chain_saved_p = data->back_chain_saved_p;
-
-
-      /* LHI r1, i2 --- load halfword immediate.  */
-      /* LGHI r1, i2 --- load halfword immediate (64-bit version).  */
-      /* LGFI r1, i2 --- load fullword immediate.  */
-      if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
-          || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
-          || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
-	data->gpr[r1] = pv_constant (i2);
-
-      /* LR r1, r2 --- load from register.  */
-      /* LGR r1, r2 --- load from register (64-bit version).  */
-      else if (is_rr (insn32, op_lr, &r1, &r2)
-	       || is_rre (insn64, op_lgr, &r1, &r2))
-	data->gpr[r1] = data->gpr[r2];
-
-      /* L r1, d2(x2, b2) --- load.  */
-      /* LY r1, d2(x2, b2) --- load (long-displacement version).  */
-      /* LG r1, d2(x2, b2) --- load (64-bit version).  */
-      else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
-	data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
-
-      /* ST r1, d2(x2, b2) --- store.  */
-      /* STY r1, d2(x2, b2) --- store (long-displacement version).  */
-      /* STG r1, d2(x2, b2) --- store (64-bit version).  */
-      else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
-	s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
-
-      /* STD r1, d2(x2,b2) --- store floating-point register.  */
-      else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
-	s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
-
-      /* STM r1, r3, d2(b2) --- store multiple.  */
-      /* STMY r1, r3, d2(b2) --- store multiple (long-displacement
-	 version).  */
-      /* STMG r1, r3, d2(b2) --- store multiple (64-bit version).  */
-      else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
-	       || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
-	       || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
-        {
-          for (; r1 <= r3; r1++, d2 += data->gpr_size)
-	    s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
-        }
-
-      /* AHI r1, i2 --- add halfword immediate.  */
-      /* AGHI r1, i2 --- add halfword immediate (64-bit version).  */
-      /* AFI r1, i2 --- add fullword immediate.  */
-      /* AGFI r1, i2 --- add fullword immediate (64-bit version).  */
-      else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
-	       || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
-	       || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
-	       || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
-	data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
-
-      /* ALFI r1, i2 --- add logical immediate.  */
-      /* ALGFI r1, i2 --- add logical immediate (64-bit version).  */
-      else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
-	       || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
-	data->gpr[r1] = pv_add_constant (data->gpr[r1],
-					 (CORE_ADDR)i2 & 0xffffffff);
-
-      /* AR r1, r2 -- add register.  */
-      /* AGR r1, r2 -- add register (64-bit version).  */
-      else if (is_rr (insn32, op_ar, &r1, &r2)
-	       || is_rre (insn64, op_agr, &r1, &r2))
-	data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
-
-      /* A r1, d2(x2, b2) -- add.  */
-      /* AY r1, d2(x2, b2) -- add (long-displacement version).  */
-      /* AG r1, d2(x2, b2) -- add (64-bit version).  */
-      else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
-	data->gpr[r1] = pv_add (data->gpr[r1],
-				s390_load (data, d2, x2, b2, data->gpr_size));
-
-      /* SLFI r1, i2 --- subtract logical immediate.  */
-      /* SLGFI r1, i2 --- subtract logical immediate (64-bit version).  */
-      else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
-	       || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
-	data->gpr[r1] = pv_add_constant (data->gpr[r1],
-					 -((CORE_ADDR)i2 & 0xffffffff));
-
-      /* SR r1, r2 -- subtract register.  */
-      /* SGR r1, r2 -- subtract register (64-bit version).  */
-      else if (is_rr (insn32, op_sr, &r1, &r2)
-	       || is_rre (insn64, op_sgr, &r1, &r2))
-	data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
-
-      /* S r1, d2(x2, b2) -- subtract.  */
-      /* SY r1, d2(x2, b2) -- subtract (long-displacement version).  */
-      /* SG r1, d2(x2, b2) -- subtract (64-bit version).  */
-      else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
-	       || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
-	data->gpr[r1] = pv_subtract (data->gpr[r1],
-				s390_load (data, d2, x2, b2, data->gpr_size));
-
-      /* LA r1, d2(x2, b2) --- load address.  */
-      /* LAY r1, d2(x2, b2) --- load address (long-displacement version).  */
-      else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
-               || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
-	data->gpr[r1] = s390_addr (data, d2, x2, b2);
-
-      /* LARL r1, i2 --- load address relative long.  */
-      else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
-	data->gpr[r1] = pv_constant (pc + i2 * 2);
-
-      /* BASR r1, 0 --- branch and save.
-         Since r2 is zero, this saves the PC in r1, but doesn't branch.  */
-      else if (is_rr (insn, op_basr, &r1, &r2)
-               && r2 == 0)
-	data->gpr[r1] = pv_constant (next_pc);
-
-      /* BRAS r1, i2 --- branch relative and save.  */
-      else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
-        {
-          data->gpr[r1] = pv_constant (next_pc);
-          next_pc = pc + i2 * 2;
-
-          /* We'd better not interpret any backward branches.  We'll
-             never terminate.  */
-          if (next_pc <= pc)
-            break;
-        }
-
-      /* Terminate search when hitting any other branch instruction.  */
-      else if (is_rr (insn, op_basr, &r1, &r2)
-	       || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
-	       || is_rr (insn, op_bcr, &r1, &r2)
-	       || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
-	       || is_ri (insn, op1_brc, op2_brc, &r1, &i2)
-	       || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
-	       || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
-	break;
-
-      else
-	{
-	  /* An instruction we don't know how to simulate.  The only
-	     safe thing to do would be to set every value we're tracking
-	     to 'unknown'.  Instead, we'll be optimistic: we assume that
-	     we *can* interpret every instruction that the compiler uses
-	     to manipulate any of the data we're interested in here --
-	     then we can just ignore anything else.  */
-	}
-
-      /* Record the address after the last instruction that changed
-         the FP, SP, or backlink.  Ignore instructions that changed
-         them back to their original values --- those are probably
-         restore instructions.  (The back chain is never restored,
-         just popped.)  */
-      {
-        pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
-        pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
-        
-        if ((! pv_is_identical (pre_insn_sp, sp)
-             && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
-	     && sp.kind != pvk_unknown)
-            || (! pv_is_identical (pre_insn_fp, fp)
-                && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
-		&& fp.kind != pvk_unknown)
-            || pre_insn_back_chain_saved_p != data->back_chain_saved_p)
-          result = next_pc;
-      }
-    }
-
-  /* Record where all the registers were saved.  */
-  pv_area_scan (data->stack, s390_check_for_saved, data);
-
-  free_pv_area (data->stack);
-  data->stack = NULL;
-
-  return result;
-}
-
-/* Advance PC across any function entry prologue instructions to reach 
-   some "real" code.  */
-static CORE_ADDR
-s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
-{
-  struct s390_prologue_data data;
-  CORE_ADDR skip_pc;
-  skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
-  return skip_pc ? skip_pc : pc;
-}
-
-/* Return true if we are in the functin's epilogue, i.e. after the
-   instruction that destroyed the function's stack frame.  */
-static int
-s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
-{
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-
-  /* In frameless functions, there's not frame to destroy and thus
-     we don't care about the epilogue.
-
-     In functions with frame, the epilogue sequence is a pair of
-     a LM-type instruction that restores (amongst others) the
-     return register %r14 and the stack pointer %r15, followed
-     by a branch 'br %r14' --or equivalent-- that effects the
-     actual return.
-
-     In that situation, this function needs to return 'true' in
-     exactly one case: when pc points to that branch instruction.
-
-     Thus we try to disassemble the one instructions immediately
-     preceding pc and check whether it is an LM-type instruction
-     modifying the stack pointer.
-
-     Note that disassembling backwards is not reliable, so there
-     is a slight chance of false positives here ...  */
-
-  bfd_byte insn[6];
-  unsigned int r1, r3, b2;
-  int d2;
-
-  if (word_size == 4
-      && !target_read_memory (pc - 4, insn, 4)
-      && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
-      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
-    return 1;
-
-  if (word_size == 4
-      && !target_read_memory (pc - 6, insn, 6)
-      && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
-      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
-    return 1;
-
-  if (word_size == 8
-      && !target_read_memory (pc - 6, insn, 6)
-      && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
-      && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
-    return 1;
-
-  return 0;
-}
-
-/* Displaced stepping.  */
-
-/* Fix up the state of registers and memory after having single-stepped
-   a displaced instruction.  */
-static void
-s390_displaced_step_fixup (struct gdbarch *gdbarch,
-			   struct displaced_step_closure *closure,
-			   CORE_ADDR from, CORE_ADDR to,
-			   struct regcache *regs)
-{
-  /* Since we use simple_displaced_step_copy_insn, our closure is a
-     copy of the instruction.  */
-  gdb_byte *insn = (gdb_byte *) closure;
-  static int s390_instrlen[] = { 2, 4, 4, 6 };
-  int insnlen = s390_instrlen[insn[0] >> 6];
-
-  /* Fields for various kinds of instructions.  */
-  unsigned int b2, r1, r2, x2, r3;
-  int i2, d2;
-
-  /* Get current PC and addressing mode bit.  */
-  CORE_ADDR pc = regcache_read_pc (regs);
-  ULONGEST amode = 0;
-
-  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-    {
-      regcache_cooked_read_unsigned (regs, S390_PSWA_REGNUM, &amode);
-      amode &= 0x80000000;
-    }
-
-  if (debug_displaced)
-    fprintf_unfiltered (gdb_stdlog,
-			"displaced: (s390) fixup (%s, %s) pc %s len %d amode 0x%x\n",
-			paddress (gdbarch, from), paddress (gdbarch, to),
-			paddress (gdbarch, pc), insnlen, (int) amode);
-
-  /* Handle absolute branch and save instructions.  */
-  if (is_rr (insn, op_basr, &r1, &r2)
-      || is_rx (insn, op_bas, &r1, &d2, &x2, &b2))
-    {
-      /* Recompute saved return address in R1.  */
-      regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
-				      amode | (from + insnlen));
-    }
-
-  /* Handle absolute branch instructions.  */
-  else if (is_rr (insn, op_bcr, &r1, &r2)
-	   || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
-	   || is_rr (insn, op_bctr, &r1, &r2)
-	   || is_rre (insn, op_bctgr, &r1, &r2)
-	   || is_rx (insn, op_bct, &r1, &d2, &x2, &b2)
-	   || is_rxy (insn, op1_bctg, op2_brctg, &r1, &d2, &x2, &b2)
-	   || is_rs (insn, op_bxh, &r1, &r3, &d2, &b2)
-	   || is_rsy (insn, op1_bxhg, op2_bxhg, &r1, &r3, &d2, &b2)
-	   || is_rs (insn, op_bxle, &r1, &r3, &d2, &b2)
-	   || is_rsy (insn, op1_bxleg, op2_bxleg, &r1, &r3, &d2, &b2))
-    {
-      /* Update PC iff branch was *not* taken.  */
-      if (pc == to + insnlen)
-	regcache_write_pc (regs, from + insnlen);
-    }
-
-  /* Handle PC-relative branch and save instructions.  */
-  else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)
-           || is_ril (insn, op1_brasl, op2_brasl, &r1, &i2))
-    {
-      /* Update PC.  */
-      regcache_write_pc (regs, pc - to + from);
-      /* Recompute saved return address in R1.  */
-      regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
-				      amode | (from + insnlen));
-    }
-
-  /* Handle PC-relative branch instructions.  */
-  else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2)
-	   || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
-	   || is_ri (insn, op1_brct, op2_brct, &r1, &i2)
-	   || is_ri (insn, op1_brctg, op2_brctg, &r1, &i2)
-	   || is_rsi (insn, op_brxh, &r1, &r3, &i2)
-	   || is_rie (insn, op1_brxhg, op2_brxhg, &r1, &r3, &i2)
-	   || is_rsi (insn, op_brxle, &r1, &r3, &i2)
-	   || is_rie (insn, op1_brxlg, op2_brxlg, &r1, &r3, &i2))
-    {
-      /* Update PC.  */
-      regcache_write_pc (regs, pc - to + from);
-    }
-
-  /* Handle LOAD ADDRESS RELATIVE LONG.  */
-  else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
-    {
-      /* Update PC.  */
-      regcache_write_pc (regs, from + insnlen);
-      /* Recompute output address in R1.  */ 
-      regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
-				      amode | (from + i2 * 2));
-    }
-
-  /* If we executed a breakpoint instruction, point PC right back at it.  */
-  else if (insn[0] == 0x0 && insn[1] == 0x1)
-    regcache_write_pc (regs, from);
-
-  /* For any other insn, PC points right after the original instruction.  */
-  else
-    regcache_write_pc (regs, from + insnlen);
-
-  if (debug_displaced)
-    fprintf_unfiltered (gdb_stdlog,
-			"displaced: (s390) pc is now %s\n",
-			paddress (gdbarch, regcache_read_pc (regs)));
-}
-
-
-/* Helper routine to unwind pseudo registers.  */
-
-static struct value *
-s390_unwind_pseudo_register (struct frame_info *this_frame, int regnum)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  struct type *type = register_type (gdbarch, regnum);
-
-  /* Unwind PC via PSW address.  */
-  if (regnum == tdep->pc_regnum)
-    {
-      struct value *val;
-
-      val = frame_unwind_register_value (this_frame, S390_PSWA_REGNUM);
-      if (!value_optimized_out (val))
-	{
-	  LONGEST pswa = value_as_long (val);
-
-	  if (TYPE_LENGTH (type) == 4)
-	    return value_from_pointer (type, pswa & 0x7fffffff);
-	  else
-	    return value_from_pointer (type, pswa);
-	}
-    }
-
-  /* Unwind CC via PSW mask.  */
-  if (regnum == tdep->cc_regnum)
-    {
-      struct value *val;
-
-      val = frame_unwind_register_value (this_frame, S390_PSWM_REGNUM);
-      if (!value_optimized_out (val))
-	{
-	  LONGEST pswm = value_as_long (val);
-
-	  if (TYPE_LENGTH (type) == 4)
-	    return value_from_longest (type, (pswm >> 12) & 3);
-	  else
-	    return value_from_longest (type, (pswm >> 44) & 3);
-	}
-    }
-
-  /* Unwind full GPRs to show at least the lower halves (as the
-     upper halves are undefined).  */
-  if (regnum_is_gpr_full (tdep, regnum))
-    {
-      int reg = regnum - tdep->gpr_full_regnum;
-      struct value *val;
-
-      val = frame_unwind_register_value (this_frame, S390_R0_REGNUM + reg);
-      if (!value_optimized_out (val))
-	return value_cast (type, val);
-    }
-
-  return allocate_optimized_out_value (type);
-}
-
-static struct value *
-s390_trad_frame_prev_register (struct frame_info *this_frame,
-			       struct trad_frame_saved_reg saved_regs[],
-			       int regnum)
-{
-  if (regnum < S390_NUM_REGS)
-    return trad_frame_get_prev_register (this_frame, saved_regs, regnum);
-  else
-    return s390_unwind_pseudo_register (this_frame, regnum);
-}
-
-
-/* Normal stack frames.  */
-
-struct s390_unwind_cache {
-
-  CORE_ADDR func;
-  CORE_ADDR frame_base;
-  CORE_ADDR local_base;
-
-  struct trad_frame_saved_reg *saved_regs;
-};
-
-static int
-s390_prologue_frame_unwind_cache (struct frame_info *this_frame,
-				  struct s390_unwind_cache *info)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  struct s390_prologue_data data;
-  pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
-  pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
-  int i;
-  CORE_ADDR cfa;
-  CORE_ADDR func;
-  CORE_ADDR result;
-  ULONGEST reg;
-  CORE_ADDR prev_sp;
-  int frame_pointer;
-  int size;
-  struct frame_info *next_frame;
-
-  /* Try to find the function start address.  If we can't find it, we don't
-     bother searching for it -- with modern compilers this would be mostly
-     pointless anyway.  Trust that we'll either have valid DWARF-2 CFI data
-     or else a valid backchain ...  */
-  func = get_frame_func (this_frame);
-  if (!func)
-    return 0;
-
-  /* Try to analyze the prologue.  */
-  result = s390_analyze_prologue (gdbarch, func,
-				  get_frame_pc (this_frame), &data);
-  if (!result)
-    return 0;
-
-  /* If this was successful, we should have found the instruction that
-     sets the stack pointer register to the previous value of the stack 
-     pointer minus the frame size.  */
-  if (!pv_is_register (*sp, S390_SP_REGNUM))
-    return 0;
-
-  /* A frame size of zero at this point can mean either a real 
-     frameless function, or else a failure to find the prologue.
-     Perform some sanity checks to verify we really have a 
-     frameless function.  */
-  if (sp->k == 0)
-    {
-      /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame 
-	 size zero.  This is only possible if the next frame is a sentinel 
-	 frame, a dummy frame, or a signal trampoline frame.  */
-      /* FIXME: cagney/2004-05-01: This sanity check shouldn't be
-	 needed, instead the code should simpliy rely on its
-	 analysis.  */
-      next_frame = get_next_frame (this_frame);
-      while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
-	next_frame = get_next_frame (next_frame);
-      if (next_frame
-	  && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
-	return 0;
-
-      /* If we really have a frameless function, %r14 must be valid
-	 -- in particular, it must point to a different function.  */
-      reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);
-      reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
-      if (get_pc_function_start (reg) == func)
-	{
-	  /* However, there is one case where it *is* valid for %r14
-	     to point to the same function -- if this is a recursive
-	     call, and we have stopped in the prologue *before* the
-	     stack frame was allocated.
-
-	     Recognize this case by looking ahead a bit ...  */
-
-	  struct s390_prologue_data data2;
-	  pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
-
-	  if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
-	        && pv_is_register (*sp, S390_SP_REGNUM)
-	        && sp->k != 0))
-	    return 0;
-	}
-    }
-
-
-  /* OK, we've found valid prologue data.  */
-  size = -sp->k;
-
-  /* If the frame pointer originally also holds the same value
-     as the stack pointer, we're probably using it.  If it holds
-     some other value -- even a constant offset -- it is most
-     likely used as temp register.  */
-  if (pv_is_identical (*sp, *fp))
-    frame_pointer = S390_FRAME_REGNUM;
-  else
-    frame_pointer = S390_SP_REGNUM;
-
-  /* If we've detected a function with stack frame, we'll still have to 
-     treat it as frameless if we're currently within the function epilog 
-     code at a point where the frame pointer has already been restored.
-     This can only happen in an innermost frame.  */
-  /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
-     instead the code should simpliy rely on its analysis.  */
-  next_frame = get_next_frame (this_frame);
-  while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
-    next_frame = get_next_frame (next_frame);
-  if (size > 0
-      && (next_frame == NULL
-	  || get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))
-    {
-      /* See the comment in s390_in_function_epilogue_p on why this is
-	 not completely reliable ...  */
-      if (s390_in_function_epilogue_p (gdbarch, get_frame_pc (this_frame)))
-	{
-	  memset (&data, 0, sizeof (data));
-	  size = 0;
-	  frame_pointer = S390_SP_REGNUM;
-	}
-    }
-
-  /* Once we know the frame register and the frame size, we can unwind
-     the current value of the frame register from the next frame, and
-     add back the frame size to arrive that the previous frame's 
-     stack pointer value.  */
-  prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;
-  cfa = prev_sp + 16*word_size + 32;
-
-  /* Set up ABI call-saved/call-clobbered registers.  */
-  for (i = 0; i < S390_NUM_REGS; i++)
-    if (!s390_register_call_saved (gdbarch, i))
-      trad_frame_set_unknown (info->saved_regs, i);
-
-  /* CC is always call-clobbered.  */
-  trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
-
-  /* Record the addresses of all register spill slots the prologue parser
-     has recognized.  Consider only registers defined as call-saved by the
-     ABI; for call-clobbered registers the parser may have recognized
-     spurious stores.  */
-
-  for (i = 0; i < 16; i++)
-    if (s390_register_call_saved (gdbarch, S390_R0_REGNUM + i)
-	&& data.gpr_slot[i] != 0)
-      info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
-
-  for (i = 0; i < 16; i++)
-    if (s390_register_call_saved (gdbarch, S390_F0_REGNUM + i)
-	&& data.fpr_slot[i] != 0)
-      info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
-
-  /* Function return will set PC to %r14.  */
-  info->saved_regs[S390_PSWA_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
-
-  /* In frameless functions, we unwind simply by moving the return
-     address to the PC.  However, if we actually stored to the
-     save area, use that -- we might only think the function frameless
-     because we're in the middle of the prologue ...  */
-  if (size == 0
-      && !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
-    {
-      info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
-    }
-
-  /* Another sanity check: unless this is a frameless function,
-     we should have found spill slots for SP and PC.
-     If not, we cannot unwind further -- this happens e.g. in
-     libc's thread_start routine.  */
-  if (size > 0)
-    {
-      if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
-	  || !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
-	prev_sp = -1;
-    }
-
-  /* We use the current value of the frame register as local_base,
-     and the top of the register save area as frame_base.  */
-  if (prev_sp != -1)
-    {
-      info->frame_base = prev_sp + 16*word_size + 32;
-      info->local_base = prev_sp - size;
-    }
-
-  info->func = func;
-  return 1;
-}
-
-static void
-s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
-				   struct s390_unwind_cache *info)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  CORE_ADDR backchain;
-  ULONGEST reg;
-  LONGEST sp;
-  int i;
-
-  /* Set up ABI call-saved/call-clobbered registers.  */
-  for (i = 0; i < S390_NUM_REGS; i++)
-    if (!s390_register_call_saved (gdbarch, i))
-      trad_frame_set_unknown (info->saved_regs, i);
-
-  /* CC is always call-clobbered.  */
-  trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
-
-  /* Get the backchain.  */
-  reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
-  backchain = read_memory_unsigned_integer (reg, word_size, byte_order);
-
-  /* A zero backchain terminates the frame chain.  As additional
-     sanity check, let's verify that the spill slot for SP in the
-     save area pointed to by the backchain in fact links back to
-     the save area.  */
-  if (backchain != 0
-      && safe_read_memory_integer (backchain + 15*word_size,
-				   word_size, byte_order, &sp)
-      && (CORE_ADDR)sp == backchain)
-    {
-      /* We don't know which registers were saved, but it will have
-         to be at least %r14 and %r15.  This will allow us to continue
-         unwinding, but other prev-frame registers may be incorrect ...  */
-      info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
-      info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
-
-      /* Function return will set PC to %r14.  */
-      info->saved_regs[S390_PSWA_REGNUM]
-	= info->saved_regs[S390_RETADDR_REGNUM];
-
-      /* We use the current value of the frame register as local_base,
-         and the top of the register save area as frame_base.  */
-      info->frame_base = backchain + 16*word_size + 32;
-      info->local_base = reg;
-    }
-
-  info->func = get_frame_pc (this_frame);
-}
-
-static struct s390_unwind_cache *
-s390_frame_unwind_cache (struct frame_info *this_frame,
-			 void **this_prologue_cache)
-{
-  struct s390_unwind_cache *info;
-  if (*this_prologue_cache)
-    return *this_prologue_cache;
-
-  info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
-  *this_prologue_cache = info;
-  info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
-  info->func = -1;
-  info->frame_base = -1;
-  info->local_base = -1;
-
-  /* Try to use prologue analysis to fill the unwind cache.
-     If this fails, fall back to reading the stack backchain.  */
-  if (!s390_prologue_frame_unwind_cache (this_frame, info))
-    s390_backchain_frame_unwind_cache (this_frame, info);
-
-  return info;
-}
-
-static void
-s390_frame_this_id (struct frame_info *this_frame,
-		    void **this_prologue_cache,
-		    struct frame_id *this_id)
-{
-  struct s390_unwind_cache *info
-    = s390_frame_unwind_cache (this_frame, this_prologue_cache);
-
-  if (info->frame_base == -1)
-    return;
-
-  *this_id = frame_id_build (info->frame_base, info->func);
-}
-
-static struct value *
-s390_frame_prev_register (struct frame_info *this_frame,
-			  void **this_prologue_cache, int regnum)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  struct s390_unwind_cache *info
-    = s390_frame_unwind_cache (this_frame, this_prologue_cache);
-
-  return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
-}
-
-static const struct frame_unwind s390_frame_unwind = {
-  NORMAL_FRAME,
-  default_frame_unwind_stop_reason,
-  s390_frame_this_id,
-  s390_frame_prev_register,
-  NULL,
-  default_frame_sniffer
-};
-
-
-/* Code stubs and their stack frames.  For things like PLTs and NULL
-   function calls (where there is no true frame and the return address
-   is in the RETADDR register).  */
-
-struct s390_stub_unwind_cache
-{
-  CORE_ADDR frame_base;
-  struct trad_frame_saved_reg *saved_regs;
-};
-
-static struct s390_stub_unwind_cache *
-s390_stub_frame_unwind_cache (struct frame_info *this_frame,
-			      void **this_prologue_cache)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  struct s390_stub_unwind_cache *info;
-  ULONGEST reg;
-
-  if (*this_prologue_cache)
-    return *this_prologue_cache;
-
-  info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
-  *this_prologue_cache = info;
-  info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
-
-  /* The return address is in register %r14.  */
-  info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
-
-  /* Retrieve stack pointer and determine our frame base.  */
-  reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
-  info->frame_base = reg + 16*word_size + 32;
-
-  return info;
-}
-
-static void
-s390_stub_frame_this_id (struct frame_info *this_frame,
-			 void **this_prologue_cache,
-			 struct frame_id *this_id)
-{
-  struct s390_stub_unwind_cache *info
-    = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
-  *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
-}
-
-static struct value *
-s390_stub_frame_prev_register (struct frame_info *this_frame,
-			       void **this_prologue_cache, int regnum)
-{
-  struct s390_stub_unwind_cache *info
-    = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
-  return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
-}
-
-static int
-s390_stub_frame_sniffer (const struct frame_unwind *self,
-			 struct frame_info *this_frame,
-			 void **this_prologue_cache)
-{
-  CORE_ADDR addr_in_block;
-  bfd_byte insn[S390_MAX_INSTR_SIZE];
-
-  /* If the current PC points to non-readable memory, we assume we
-     have trapped due to an invalid function pointer call.  We handle
-     the non-existing current function like a PLT stub.  */
-  addr_in_block = get_frame_address_in_block (this_frame);
-  if (in_plt_section (addr_in_block)
-      || s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)
-    return 1;
-  return 0;
-}
-
-static const struct frame_unwind s390_stub_frame_unwind = {
-  NORMAL_FRAME,
-  default_frame_unwind_stop_reason,
-  s390_stub_frame_this_id,
-  s390_stub_frame_prev_register,
-  NULL,
-  s390_stub_frame_sniffer
-};
-
-
-/* Signal trampoline stack frames.  */
-
-struct s390_sigtramp_unwind_cache {
-  CORE_ADDR frame_base;
-  struct trad_frame_saved_reg *saved_regs;
-};
-
-static struct s390_sigtramp_unwind_cache *
-s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
-				  void **this_prologue_cache)
-{
-  struct gdbarch *gdbarch = get_frame_arch (this_frame);
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  struct s390_sigtramp_unwind_cache *info;
-  ULONGEST this_sp, prev_sp;
-  CORE_ADDR next_ra, next_cfa, sigreg_ptr, sigreg_high_off;
-  int i;
-
-  if (*this_prologue_cache)
-    return *this_prologue_cache;
-
-  info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
-  *this_prologue_cache = info;
-  info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
-
-  this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
-  next_ra = get_frame_pc (this_frame);
-  next_cfa = this_sp + 16*word_size + 32;
-
-  /* New-style RT frame:
-	retcode + alignment (8 bytes)
-	siginfo (128 bytes)
-	ucontext (contains sigregs at offset 5 words).  */
-  if (next_ra == next_cfa)
-    {
-      sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
-      /* sigregs are followed by uc_sigmask (8 bytes), then by the
-	 upper GPR halves if present.  */
-      sigreg_high_off = 8;
-    }
-
-  /* Old-style RT frame and all non-RT frames:
-	old signal mask (8 bytes)
-	pointer to sigregs.  */
-  else
-    {
-      sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8,
-						 word_size, byte_order);
-      /* sigregs are followed by signo (4 bytes), then by the
-	 upper GPR halves if present.  */
-      sigreg_high_off = 4;
-    }
-
-  /* The sigregs structure looks like this:
-            long   psw_mask;
-            long   psw_addr;
-            long   gprs[16];
-            int    acrs[16];
-            int    fpc;
-            int    __pad;
-            double fprs[16];  */
-
-  /* PSW mask and address.  */
-  info->saved_regs[S390_PSWM_REGNUM].addr = sigreg_ptr;
-  sigreg_ptr += word_size;
-  info->saved_regs[S390_PSWA_REGNUM].addr = sigreg_ptr;
-  sigreg_ptr += word_size;
-
-  /* Then the GPRs.  */
-  for (i = 0; i < 16; i++)
-    {
-      info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
-      sigreg_ptr += word_size;
-    }
-
-  /* Then the ACRs.  */
-  for (i = 0; i < 16; i++)
-    {
-      info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
-      sigreg_ptr += 4;
-    }
-
-  /* The floating-point control word.  */
-  info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
-  sigreg_ptr += 8;
-
-  /* And finally the FPRs.  */
-  for (i = 0; i < 16; i++)
-    {
-      info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
-      sigreg_ptr += 8;
-    }
-
-  /* If we have them, the GPR upper halves are appended at the end.  */
-  sigreg_ptr += sigreg_high_off;
-  if (tdep->gpr_full_regnum != -1)
-    for (i = 0; i < 16; i++)
-      {
-        info->saved_regs[S390_R0_UPPER_REGNUM + i].addr = sigreg_ptr;
-	sigreg_ptr += 4;
-      }
-
-  /* Restore the previous frame's SP.  */
-  prev_sp = read_memory_unsigned_integer (
-			info->saved_regs[S390_SP_REGNUM].addr,
-			word_size, byte_order);
-
-  /* Determine our frame base.  */
-  info->frame_base = prev_sp + 16*word_size + 32;
-
-  return info;
-}
-
-static void
-s390_sigtramp_frame_this_id (struct frame_info *this_frame,
-			     void **this_prologue_cache,
-			     struct frame_id *this_id)
-{
-  struct s390_sigtramp_unwind_cache *info
-    = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
-  *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
-}
-
-static struct value *
-s390_sigtramp_frame_prev_register (struct frame_info *this_frame,
-				   void **this_prologue_cache, int regnum)
-{
-  struct s390_sigtramp_unwind_cache *info
-    = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
-  return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
-}
-
-static int
-s390_sigtramp_frame_sniffer (const struct frame_unwind *self,
-			     struct frame_info *this_frame,
-			     void **this_prologue_cache)
-{
-  CORE_ADDR pc = get_frame_pc (this_frame);
-  bfd_byte sigreturn[2];
-
-  if (target_read_memory (pc, sigreturn, 2))
-    return 0;
-
-  if (sigreturn[0] != 0x0a /* svc */)
-    return 0;
-
-  if (sigreturn[1] != 119 /* sigreturn */
-      && sigreturn[1] != 173 /* rt_sigreturn */)
-    return 0;
-  
-  return 1;
-}
-
-static const struct frame_unwind s390_sigtramp_frame_unwind = {
-  SIGTRAMP_FRAME,
-  default_frame_unwind_stop_reason,
-  s390_sigtramp_frame_this_id,
-  s390_sigtramp_frame_prev_register,
-  NULL,
-  s390_sigtramp_frame_sniffer
-};
-
-
-/* Frame base handling.  */
-
-static CORE_ADDR
-s390_frame_base_address (struct frame_info *this_frame, void **this_cache)
-{
-  struct s390_unwind_cache *info
-    = s390_frame_unwind_cache (this_frame, this_cache);
-  return info->frame_base;
-}
-
-static CORE_ADDR
-s390_local_base_address (struct frame_info *this_frame, void **this_cache)
-{
-  struct s390_unwind_cache *info
-    = s390_frame_unwind_cache (this_frame, this_cache);
-  return info->local_base;
-}
-
-static const struct frame_base s390_frame_base = {
-  &s390_frame_unwind,
-  s390_frame_base_address,
-  s390_local_base_address,
-  s390_local_base_address
-};
-
-static CORE_ADDR
-s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  ULONGEST pc;
-  pc = frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);
-  return gdbarch_addr_bits_remove (gdbarch, pc);
-}
-
-static CORE_ADDR
-s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
-{
-  ULONGEST sp;
-  sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
-  return gdbarch_addr_bits_remove (gdbarch, sp);
-}
-
-
-/* DWARF-2 frame support.  */
-
-static struct value *
-s390_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
-			   int regnum)
-{
-  return s390_unwind_pseudo_register (this_frame, regnum);
-}
-
-static void
-s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
-                            struct dwarf2_frame_state_reg *reg,
-			    struct frame_info *this_frame)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
-  /* The condition code (and thus PSW mask) is call-clobbered.  */
-  if (regnum == S390_PSWM_REGNUM)
-    reg->how = DWARF2_FRAME_REG_UNDEFINED;
-
-  /* The PSW address unwinds to the return address.  */
-  else if (regnum == S390_PSWA_REGNUM)
-    reg->how = DWARF2_FRAME_REG_RA;
-
-  /* Fixed registers are call-saved or call-clobbered
-     depending on the ABI in use.  */
-  else if (regnum < S390_NUM_REGS)
-    {
-      if (s390_register_call_saved (gdbarch, regnum))
-	reg->how = DWARF2_FRAME_REG_SAME_VALUE;
-      else
-	reg->how = DWARF2_FRAME_REG_UNDEFINED;
-    }
-
-  /* We install a special function to unwind pseudos.  */
-  else
-    {
-      reg->how = DWARF2_FRAME_REG_FN;
-      reg->loc.fn = s390_dwarf2_prev_register;
-    }
-}
-
-
-/* Dummy function calls.  */
-
-/* Return non-zero if TYPE is an integer-like type, zero otherwise.
-   "Integer-like" types are those that should be passed the way
-   integers are: integers, enums, ranges, characters, and booleans.  */
-static int
-is_integer_like (struct type *type)
-{
-  enum type_code code = TYPE_CODE (type);
-
-  return (code == TYPE_CODE_INT
-          || code == TYPE_CODE_ENUM
-          || code == TYPE_CODE_RANGE
-          || code == TYPE_CODE_CHAR
-          || code == TYPE_CODE_BOOL);
-}
-
-/* Return non-zero if TYPE is a pointer-like type, zero otherwise.
-   "Pointer-like" types are those that should be passed the way
-   pointers are: pointers and references.  */
-static int
-is_pointer_like (struct type *type)
-{
-  enum type_code code = TYPE_CODE (type);
-
-  return (code == TYPE_CODE_PTR
-          || code == TYPE_CODE_REF);
-}
-
-
-/* Return non-zero if TYPE is a `float singleton' or `double
-   singleton', zero otherwise.
-
-   A `T singleton' is a struct type with one member, whose type is
-   either T or a `T singleton'.  So, the following are all float
-   singletons:
-
-   struct { float x };
-   struct { struct { float x; } x; };
-   struct { struct { struct { float x; } x; } x; };
-
-   ... and so on.
-
-   All such structures are passed as if they were floats or doubles,
-   as the (revised) ABI says.  */
-static int
-is_float_singleton (struct type *type)
-{
-  if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
-    {
-      struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
-      CHECK_TYPEDEF (singleton_type);
-
-      return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
-	      || TYPE_CODE (singleton_type) == TYPE_CODE_DECFLOAT
-	      || is_float_singleton (singleton_type));
-    }
-
-  return 0;
-}
-
-
-/* Return non-zero if TYPE is a struct-like type, zero otherwise.
-   "Struct-like" types are those that should be passed as structs are:
-   structs and unions.
-
-   As an odd quirk, not mentioned in the ABI, GCC passes float and
-   double singletons as if they were a plain float, double, etc.  (The
-   corresponding union types are handled normally.)  So we exclude
-   those types here.  *shrug* */
-static int
-is_struct_like (struct type *type)
-{
-  enum type_code code = TYPE_CODE (type);
-
-  return (code == TYPE_CODE_UNION
-          || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type)));
-}
-
-
-/* Return non-zero if TYPE is a float-like type, zero otherwise.
-   "Float-like" types are those that should be passed as
-   floating-point values are.
-
-   You'd think this would just be floats, doubles, long doubles, etc.
-   But as an odd quirk, not mentioned in the ABI, GCC passes float and
-   double singletons as if they were a plain float, double, etc.  (The
-   corresponding union types are handled normally.)  So we include
-   those types here.  *shrug* */
-static int
-is_float_like (struct type *type)
-{
-  return (TYPE_CODE (type) == TYPE_CODE_FLT
-	  || TYPE_CODE (type) == TYPE_CODE_DECFLOAT
-          || is_float_singleton (type));
-}
-
-
-static int
-is_power_of_two (unsigned int n)
-{
-  return ((n & (n - 1)) == 0);
-}
-
-/* Return non-zero if TYPE should be passed as a pointer to a copy,
-   zero otherwise.  */
-static int
-s390_function_arg_pass_by_reference (struct type *type)
-{
-  if (TYPE_LENGTH (type) > 8)
-    return 1;
-
-  return (is_struct_like (type) && !is_power_of_two (TYPE_LENGTH (type)))
-	  || TYPE_CODE (type) == TYPE_CODE_COMPLEX
-	  || (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type));
-}
-
-/* Return non-zero if TYPE should be passed in a float register
-   if possible.  */
-static int
-s390_function_arg_float (struct type *type)
-{
-  if (TYPE_LENGTH (type) > 8)
-    return 0;
-
-  return is_float_like (type);
-}
-
-/* Return non-zero if TYPE should be passed in an integer register
-   (or a pair of integer registers) if possible.  */
-static int
-s390_function_arg_integer (struct type *type)
-{
-  if (TYPE_LENGTH (type) > 8)
-    return 0;
-
-   return is_integer_like (type)
-	  || is_pointer_like (type)
-	  || (is_struct_like (type) && is_power_of_two (TYPE_LENGTH (type)));
-}
-
-/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
-   word as required for the ABI.  */
-static LONGEST
-extend_simple_arg (struct gdbarch *gdbarch, struct value *arg)
-{
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  struct type *type = check_typedef (value_type (arg));
-
-  /* Even structs get passed in the least significant bits of the
-     register / memory word.  It's not really right to extract them as
-     an integer, but it does take care of the extension.  */
-  if (TYPE_UNSIGNED (type))
-    return extract_unsigned_integer (value_contents (arg),
-                                     TYPE_LENGTH (type), byte_order);
-  else
-    return extract_signed_integer (value_contents (arg),
-                                   TYPE_LENGTH (type), byte_order);
-}
-
-
-/* Return the alignment required by TYPE.  */
-static int
-alignment_of (struct type *type)
-{
-  int alignment;
-
-  if (is_integer_like (type)
-      || is_pointer_like (type)
-      || TYPE_CODE (type) == TYPE_CODE_FLT
-      || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
-    alignment = TYPE_LENGTH (type);
-  else if (TYPE_CODE (type) == TYPE_CODE_STRUCT
-           || TYPE_CODE (type) == TYPE_CODE_UNION)
-    {
-      int i;
-
-      alignment = 1;
-      for (i = 0; i < TYPE_NFIELDS (type); i++)
-        {
-          int field_alignment
-	    = alignment_of (check_typedef (TYPE_FIELD_TYPE (type, i)));
-
-          if (field_alignment > alignment)
-            alignment = field_alignment;
-        }
-    }
-  else
-    alignment = 1;
-
-  /* Check that everything we ever return is a power of two.  Lots of
-     code doesn't want to deal with aligning things to arbitrary
-     boundaries.  */
-  gdb_assert ((alignment & (alignment - 1)) == 0);
-
-  return alignment;
-}
-
-
-/* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
-   place to be passed to a function, as specified by the "GNU/Linux
-   for S/390 ELF Application Binary Interface Supplement".
-
-   SP is the current stack pointer.  We must put arguments, links,
-   padding, etc. whereever they belong, and return the new stack
-   pointer value.
-   
-   If STRUCT_RETURN is non-zero, then the function we're calling is
-   going to return a structure by value; STRUCT_ADDR is the address of
-   a block we've allocated for it on the stack.
-
-   Our caller has taken care of any type promotions needed to satisfy
-   prototypes or the old K&R argument-passing rules.  */
-static CORE_ADDR
-s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
-		      struct regcache *regcache, CORE_ADDR bp_addr,
-		      int nargs, struct value **args, CORE_ADDR sp,
-		      int struct_return, CORE_ADDR struct_addr)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  int i;
-
-  /* If the i'th argument is passed as a reference to a copy, then
-     copy_addr[i] is the address of the copy we made.  */
-  CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
-
-  /* Reserve space for the reference-to-copy area.  */
-  for (i = 0; i < nargs; i++)
-    {
-      struct value *arg = args[i];
-      struct type *type = check_typedef (value_type (arg));
-
-      if (s390_function_arg_pass_by_reference (type))
-        {
-          sp -= TYPE_LENGTH (type);
-          sp = align_down (sp, alignment_of (type));
-          copy_addr[i] = sp;
-        }
-    }
-
-  /* Reserve space for the parameter area.  As a conservative
-     simplification, we assume that everything will be passed on the
-     stack.  Since every argument larger than 8 bytes will be 
-     passed by reference, we use this simple upper bound.  */
-  sp -= nargs * 8;
-
-  /* After all that, make sure it's still aligned on an eight-byte
-     boundary.  */
-  sp = align_down (sp, 8);
-
-  /* Allocate the standard frame areas: the register save area, the
-     word reserved for the compiler (which seems kind of meaningless),
-     and the back chain pointer.  */
-  sp -= 16*word_size + 32;
-
-  /* Now we have the final SP value.  Make sure we didn't underflow;
-     on 31-bit, this would result in addresses with the high bit set,
-     which causes confusion elsewhere.  Note that if we error out
-     here, stack and registers remain untouched.  */
-  if (gdbarch_addr_bits_remove (gdbarch, sp) != sp)
-    error (_("Stack overflow"));
-
-
-  /* Finally, place the actual parameters, working from SP towards
-     higher addresses.  The code above is supposed to reserve enough
-     space for this.  */
-  {
-    int fr = 0;
-    int gr = 2;
-    CORE_ADDR starg = sp + 16*word_size + 32;
-
-    /* A struct is returned using general register 2.  */
-    if (struct_return)
-      {
-	regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
-				        struct_addr);
-	gr++;
-      }
-
-    for (i = 0; i < nargs; i++)
-      {
-        struct value *arg = args[i];
-        struct type *type = check_typedef (value_type (arg));
-        unsigned length = TYPE_LENGTH (type);
-
-	if (s390_function_arg_pass_by_reference (type))
-	  {
-	    /* Actually copy the argument contents to the stack slot
-	       that was reserved above.  */
-	    write_memory (copy_addr[i], value_contents (arg), length);
-
-	    if (gr <= 6)
-	      {
-		regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
-					        copy_addr[i]);
-		gr++;
-	      }
-	    else
-	      {
-		write_memory_unsigned_integer (starg, word_size, byte_order,
-					       copy_addr[i]);
-		starg += word_size;
-	      }
-	  }
-	else if (s390_function_arg_float (type))
-	  {
-	    /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
-	       the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6.  */
-	    if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
-	      {
-		/* When we store a single-precision value in an FP register,
-		   it occupies the leftmost bits.  */
-		regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
-					    0, length, value_contents (arg));
-		fr += 2;
-	      }
-	    else
-	      {
-		/* When we store a single-precision value in a stack slot,
-		   it occupies the rightmost bits.  */
-		starg = align_up (starg + length, word_size);
-                write_memory (starg - length, value_contents (arg), length);
-	      }
-	  }
-	else if (s390_function_arg_integer (type) && length <= word_size)
-	  {
-	    if (gr <= 6)
-	      {
-		/* Integer arguments are always extended to word size.  */
-		regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
-					      extend_simple_arg (gdbarch,
-								 arg));
-		gr++;
-	      }
-	    else
-	      {
-		/* Integer arguments are always extended to word size.  */
-		write_memory_signed_integer (starg, word_size, byte_order,
-                                             extend_simple_arg (gdbarch, arg));
-                starg += word_size;
-	      }
-	  }
-	else if (s390_function_arg_integer (type) && length == 2*word_size)
-	  {
-	    if (gr <= 5)
-	      {
-		regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
-				       value_contents (arg));
-		regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
-				       value_contents (arg) + word_size);
-		gr += 2;
-	      }
-	    else
-	      {
-		/* If we skipped r6 because we couldn't fit a DOUBLE_ARG
-		   in it, then don't go back and use it again later.  */
-		gr = 7;
-
-		write_memory (starg, value_contents (arg), length);
-		starg += length;
-	      }
-	  }
-	else
-	  internal_error (__FILE__, __LINE__, _("unknown argument type"));
-      }
-  }
-
-  /* Store return PSWA.  In 31-bit mode, keep addressing mode bit.  */
-  if (word_size == 4)
-    {
-      ULONGEST pswa;
-      regcache_cooked_read_unsigned (regcache, S390_PSWA_REGNUM, &pswa);
-      bp_addr = (bp_addr & 0x7fffffff) | (pswa & 0x80000000);
-    }
-  regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
-
-  /* Store updated stack pointer.  */
-  regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
-
-  /* We need to return the 'stack part' of the frame ID,
-     which is actually the top of the register save area.  */
-  return sp + 16*word_size + 32;
-}
-
-/* Assuming THIS_FRAME is a dummy, return the frame ID of that
-   dummy frame.  The frame ID's base needs to match the TOS value
-   returned by push_dummy_call, and the PC match the dummy frame's
-   breakpoint.  */
-static struct frame_id
-s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
-{
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
-  sp = gdbarch_addr_bits_remove (gdbarch, sp);
-
-  return frame_id_build (sp + 16*word_size + 32,
-                         get_frame_pc (this_frame));
-}
-
-static CORE_ADDR
-s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
-{
-  /* Both the 32- and 64-bit ABI's say that the stack pointer should
-     always be aligned on an eight-byte boundary.  */
-  return (addr & -8);
-}
-
-
-/* Function return value access.  */
-
-static enum return_value_convention
-s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
-{
-  if (TYPE_LENGTH (type) > 8)
-    return RETURN_VALUE_STRUCT_CONVENTION;
-
-  switch (TYPE_CODE (type))
-    {
-    case TYPE_CODE_STRUCT:
-    case TYPE_CODE_UNION:
-    case TYPE_CODE_ARRAY:
-    case TYPE_CODE_COMPLEX:
-      return RETURN_VALUE_STRUCT_CONVENTION;
-
-    default:
-      return RETURN_VALUE_REGISTER_CONVENTION;
-    }
-}
-
-static enum return_value_convention
-s390_return_value (struct gdbarch *gdbarch, struct value *function,
-		   struct type *type, struct regcache *regcache,
-		   gdb_byte *out, const gdb_byte *in)
-{
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  int word_size = gdbarch_ptr_bit (gdbarch) / 8;
-  enum return_value_convention rvc;
-  int length;
-
-  type = check_typedef (type);
-  rvc = s390_return_value_convention (gdbarch, type);
-  length = TYPE_LENGTH (type);
-
-  if (in)
-    {
-      switch (rvc)
-	{
-	case RETURN_VALUE_REGISTER_CONVENTION:
-	  if (TYPE_CODE (type) == TYPE_CODE_FLT
-	      || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
-	    {
-	      /* When we store a single-precision value in an FP register,
-		 it occupies the leftmost bits.  */
-	      regcache_cooked_write_part (regcache, S390_F0_REGNUM, 
-					  0, length, in);
-	    }
-	  else if (length <= word_size)
-	    {
-	      /* Integer arguments are always extended to word size.  */
-	      if (TYPE_UNSIGNED (type))
-		regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
-			extract_unsigned_integer (in, length, byte_order));
-	      else
-		regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
-			extract_signed_integer (in, length, byte_order));
-	    }
-	  else if (length == 2*word_size)
-	    {
-	      regcache_cooked_write (regcache, S390_R2_REGNUM, in);
-	      regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);
-	    }
-	  else
-	    internal_error (__FILE__, __LINE__, _("invalid return type"));
-	  break;
-
-	case RETURN_VALUE_STRUCT_CONVENTION:
-	  error (_("Cannot set function return value."));
-	  break;
-	}
-    }
-  else if (out)
-    {
-      switch (rvc)
-	{
-	case RETURN_VALUE_REGISTER_CONVENTION:
-	  if (TYPE_CODE (type) == TYPE_CODE_FLT
-	      || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
-	    {
-	      /* When we store a single-precision value in an FP register,
-		 it occupies the leftmost bits.  */
-	      regcache_cooked_read_part (regcache, S390_F0_REGNUM, 
-					 0, length, out);
-	    }
-	  else if (length <= word_size)
-	    {
-	      /* Integer arguments occupy the rightmost bits.  */
-	      regcache_cooked_read_part (regcache, S390_R2_REGNUM, 
-					 word_size - length, length, out);
-	    }
-	  else if (length == 2*word_size)
-	    {
-	      regcache_cooked_read (regcache, S390_R2_REGNUM, out);
-	      regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);
-	    }
-	  else
-	    internal_error (__FILE__, __LINE__, _("invalid return type"));
-	  break;
-
-	case RETURN_VALUE_STRUCT_CONVENTION:
-	  error (_("Function return value unknown."));
-	  break;
-	}
-    }
-
-  return rvc;
-}
-
-
-/* Breakpoints.  */
-
-static const gdb_byte *
-s390_breakpoint_from_pc (struct gdbarch *gdbarch,
-			 CORE_ADDR *pcptr, int *lenptr)
-{
-  static const gdb_byte breakpoint[] = { 0x0, 0x1 };
-
-  *lenptr = sizeof (breakpoint);
-  return breakpoint;
-}
-
-
-/* Address handling.  */
-
-static CORE_ADDR
-s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
-{
-  return addr & 0x7fffffff;
-}
-
-static int
-s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
-{
-  if (byte_size == 4)
-    return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
-  else
-    return 0;
-}
-
-static const char *
-s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
-{
-  if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
-    return "mode32";
-  else
-    return NULL;
-}
-
-static int
-s390_address_class_name_to_type_flags (struct gdbarch *gdbarch,
-				       const char *name,
-				       int *type_flags_ptr)
-{
-  if (strcmp (name, "mode32") == 0)
-    {
-      *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
-      return 1;
-    }
-  else
-    return 0;
-}
-
-/* Implementation of `gdbarch_stap_is_single_operand', as defined in
-   gdbarch.h.  */
-
-static int
-s390_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
-{
-  return ((isdigit (*s) && s[1] == '(' && s[2] == '%') /* Displacement
-							  or indirection.  */
-	  || *s == '%' /* Register access.  */
-	  || isdigit (*s)); /* Literal number.  */
-}
-
-/* Set up gdbarch struct.  */
-
-static struct gdbarch *
-s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
-{
-  const struct target_desc *tdesc = info.target_desc;
-  struct tdesc_arch_data *tdesc_data = NULL;
-  struct gdbarch *gdbarch;
-  struct gdbarch_tdep *tdep;
-  int tdep_abi;
-  int have_upper = 0;
-  int have_linux_v1 = 0;
-  int have_linux_v2 = 0;
-  int first_pseudo_reg, last_pseudo_reg;
-
-  /* Default ABI and register size.  */
-  switch (info.bfd_arch_info->mach)
-    {
-    case bfd_mach_s390_31:
-      tdep_abi = ABI_LINUX_S390;
-      break;
-
-    case bfd_mach_s390_64:
-      tdep_abi = ABI_LINUX_ZSERIES;
-      break;
-
-    default:
-      return NULL;
-    }
-
-  /* Use default target description if none provided by the target.  */
-  if (!tdesc_has_registers (tdesc))
-    {
-      if (tdep_abi == ABI_LINUX_S390)
-	tdesc = tdesc_s390_linux32;
-      else
-	tdesc = tdesc_s390x_linux64;
-    }
-
-  /* Check any target description for validity.  */
-  if (tdesc_has_registers (tdesc))
-    {
-      static const char *const gprs[] = {
-	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
-	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
-      };
-      static const char *const fprs[] = {
-	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
-	"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
-      };
-      static const char *const acrs[] = {
-	"acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
-	"acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15"
-      };
-      static const char *const gprs_lower[] = {
-	"r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l",
-	"r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
-      };
-      static const char *const gprs_upper[] = {
-	"r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
-	"r8h", "r9h", "r10h", "r11h", "r12h", "r13h", "r14h", "r15h"
-      };
-      static const char *const tdb_regs[] = {
-	"tdb0", "tac", "tct", "atia",
-	"tr0", "tr1", "tr2", "tr3", "tr4", "tr5", "tr6", "tr7",
-	"tr8", "tr9", "tr10", "tr11", "tr12", "tr13", "tr14", "tr15"
-      };
-      const struct tdesc_feature *feature;
-      int i, valid_p = 1;
-
-      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.core");
-      if (feature == NULL)
-	return NULL;
-
-      tdesc_data = tdesc_data_alloc ();
-
-      valid_p &= tdesc_numbered_register (feature, tdesc_data,
-					  S390_PSWM_REGNUM, "pswm");
-      valid_p &= tdesc_numbered_register (feature, tdesc_data,
-					  S390_PSWA_REGNUM, "pswa");
-
-      if (tdesc_unnumbered_register (feature, "r0"))
-	{
-	  for (i = 0; i < 16; i++)
-	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
-						S390_R0_REGNUM + i, gprs[i]);
-	}
-      else
-	{
-	  have_upper = 1;
-
-	  for (i = 0; i < 16; i++)
-	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
-						S390_R0_REGNUM + i,
-						gprs_lower[i]);
-	  for (i = 0; i < 16; i++)
-	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
-						S390_R0_UPPER_REGNUM + i,
-						gprs_upper[i]);
-	}
-
-      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.fpr");
-      if (feature == NULL)
-	{
-	  tdesc_data_cleanup (tdesc_data);
-	  return NULL;
-	}
-
-      valid_p &= tdesc_numbered_register (feature, tdesc_data,
-					  S390_FPC_REGNUM, "fpc");
-      for (i = 0; i < 16; i++)
-	valid_p &= tdesc_numbered_register (feature, tdesc_data,
-					    S390_F0_REGNUM + i, fprs[i]);
-
-      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.acr");
-      if (feature == NULL)
-	{
-	  tdesc_data_cleanup (tdesc_data);
-	  return NULL;
-	}
-
-      for (i = 0; i < 16; i++)
-	valid_p &= tdesc_numbered_register (feature, tdesc_data,
-					    S390_A0_REGNUM + i, acrs[i]);
-
-      /* Optional GNU/Linux-specific "registers".  */
-      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.linux");
-      if (feature)
-	{
-	  tdesc_numbered_register (feature, tdesc_data,
-				   S390_ORIG_R2_REGNUM, "orig_r2");
-
-	  if (tdesc_numbered_register (feature, tdesc_data,
-				       S390_LAST_BREAK_REGNUM, "last_break"))
-	    have_linux_v1 = 1;
-
-	  if (tdesc_numbered_register (feature, tdesc_data,
-				       S390_SYSTEM_CALL_REGNUM, "system_call"))
-	    have_linux_v2 = 1;
-
-	  if (have_linux_v2 > have_linux_v1)
-	    valid_p = 0;
-	}
-
-      /* Transaction diagnostic block.  */
-      feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.tdb");
-      if (feature)
-	{
-	  for (i = 0; i < ARRAY_SIZE (tdb_regs); i++)
-	    valid_p &= tdesc_numbered_register (feature, tdesc_data,
-						S390_TDB_DWORD0_REGNUM + i,
-						tdb_regs[i]);
-	}
-
-      if (!valid_p)
-	{
-	  tdesc_data_cleanup (tdesc_data);
-	  return NULL;
-	}
-    }
-
-  /* Find a candidate among extant architectures.  */
-  for (arches = gdbarch_list_lookup_by_info (arches, &info);
-       arches != NULL;
-       arches = gdbarch_list_lookup_by_info (arches->next, &info))
-    {
-      tdep = gdbarch_tdep (arches->gdbarch);
-      if (!tdep)
-	continue;
-      if (tdep->abi != tdep_abi)
-	continue;
-      if ((tdep->gpr_full_regnum != -1) != have_upper)
-	continue;
-      if (tdesc_data != NULL)
-	tdesc_data_cleanup (tdesc_data);
-      return arches->gdbarch;
-    }
-
-  /* Otherwise create a new gdbarch for the specified machine type.  */
-  tdep = XCALLOC (1, struct gdbarch_tdep);
-  tdep->abi = tdep_abi;
-  gdbarch = gdbarch_alloc (&info, tdep);
-
-  set_gdbarch_believe_pcc_promotion (gdbarch, 0);
-  set_gdbarch_char_signed (gdbarch, 0);
-
-  /* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
-     We can safely let them default to 128-bit, since the debug info
-     will give the size of type actually used in each case.  */
-  set_gdbarch_long_double_bit (gdbarch, 128);
-  set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
-
-  /* Amount PC must be decremented by after a breakpoint.  This is
-     often the number of bytes returned by gdbarch_breakpoint_from_pc but not
-     always.  */
-  set_gdbarch_decr_pc_after_break (gdbarch, 2);
-  /* Stack grows downward.  */
-  set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
-  set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
-  set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
-  set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
-
-  set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
-  set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
-  set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
-  set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
-  set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
-  set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
-  set_gdbarch_regset_from_core_section (gdbarch,
-                                        s390_regset_from_core_section);
-  set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
-  set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);
-  set_gdbarch_write_pc (gdbarch, s390_write_pc);
-  set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
-  set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
-  set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
-  set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
-  set_tdesc_pseudo_register_reggroup_p (gdbarch,
-                                        s390_pseudo_register_reggroup_p);
-  tdesc_use_registers (gdbarch, tdesc, tdesc_data);
-
-  /* Assign pseudo register numbers.  */
-  first_pseudo_reg = gdbarch_num_regs (gdbarch);
-  last_pseudo_reg = first_pseudo_reg;
-  tdep->gpr_full_regnum = -1;
-  if (have_upper)
-    {
-      tdep->gpr_full_regnum = last_pseudo_reg;
-      last_pseudo_reg += 16;
-    }
-  tdep->pc_regnum = last_pseudo_reg++;
-  tdep->cc_regnum = last_pseudo_reg++;
-  set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);
-  set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);
-
-  /* Inferior function calls.  */
-  set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
-  set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
-  set_gdbarch_frame_align (gdbarch, s390_frame_align);
-  set_gdbarch_return_value (gdbarch, s390_return_value);
-
-  /* Frame handling.  */
-  dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
-  dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
-  dwarf2_append_unwinders (gdbarch);
-  frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
-  frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
-  frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
-  frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
-  frame_base_set_default (gdbarch, &s390_frame_base);
-  set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
-  set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
-
-  /* Displaced stepping.  */
-  set_gdbarch_displaced_step_copy_insn (gdbarch,
-                                        simple_displaced_step_copy_insn);
-  set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
-  set_gdbarch_displaced_step_free_closure (gdbarch,
-                                           simple_displaced_step_free_closure);
-  set_gdbarch_displaced_step_location (gdbarch,
-                                       displaced_step_at_entry_point);
-  set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
-
-  /* Note that GNU/Linux is the only OS supported on this
-     platform.  */
-  linux_init_abi (info, gdbarch);
-
-  switch (tdep->abi)
-    {
-    case ABI_LINUX_S390:
-      tdep->gregset = &s390_gregset;
-      tdep->sizeof_gregset = s390_sizeof_gregset;
-      tdep->fpregset = &s390_fpregset;
-      tdep->sizeof_fpregset = s390_sizeof_fpregset;
-
-      set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
-      set_solib_svr4_fetch_link_map_offsets
-	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
-
-      if (have_upper)
-	{
-	  if (have_linux_v2)
-	    set_gdbarch_core_regset_sections (gdbarch,
-					      s390_linux64v2_regset_sections);
-	  else if (have_linux_v1)
-	    set_gdbarch_core_regset_sections (gdbarch,
-					      s390_linux64v1_regset_sections);
-	  else
-	    set_gdbarch_core_regset_sections (gdbarch,
-					      s390_linux64_regset_sections);
-	}
-      else
-	{
-	  if (have_linux_v2)
-	    set_gdbarch_core_regset_sections (gdbarch,
-					      s390_linux32v2_regset_sections);
-	  else if (have_linux_v1)
-	    set_gdbarch_core_regset_sections (gdbarch,
-					      s390_linux32v1_regset_sections);
-	  else
-	    set_gdbarch_core_regset_sections (gdbarch,
-					      s390_linux32_regset_sections);
-	}
-      break;
-
-    case ABI_LINUX_ZSERIES:
-      tdep->gregset = &s390x_gregset;
-      tdep->sizeof_gregset = s390x_sizeof_gregset;
-      tdep->fpregset = &s390_fpregset;
-      tdep->sizeof_fpregset = s390_sizeof_fpregset;
-
-      set_gdbarch_long_bit (gdbarch, 64);
-      set_gdbarch_long_long_bit (gdbarch, 64);
-      set_gdbarch_ptr_bit (gdbarch, 64);
-      set_solib_svr4_fetch_link_map_offsets
-	(gdbarch, svr4_lp64_fetch_link_map_offsets);
-      set_gdbarch_address_class_type_flags (gdbarch,
-                                            s390_address_class_type_flags);
-      set_gdbarch_address_class_type_flags_to_name (gdbarch,
-                                                    s390_address_class_type_flags_to_name);
-      set_gdbarch_address_class_name_to_type_flags (gdbarch,
-                                                    s390_address_class_name_to_type_flags);
-
-      if (have_linux_v2)
-	set_gdbarch_core_regset_sections (gdbarch,
-					  s390x_linux64v2_regset_sections);
-      else if (have_linux_v1)
-	set_gdbarch_core_regset_sections (gdbarch,
-					  s390x_linux64v1_regset_sections);
-      else
-	set_gdbarch_core_regset_sections (gdbarch,
-					  s390x_linux64_regset_sections);
-      break;
-    }
-
-  set_gdbarch_print_insn (gdbarch, print_insn_s390);
-
-  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
-
-  /* Enable TLS support.  */
-  set_gdbarch_fetch_tls_load_module_address (gdbarch,
-                                             svr4_fetch_objfile_link_map);
-
-  set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
-
-  /* SystemTap functions.  */
-  set_gdbarch_stap_register_prefix (gdbarch, "%");
-  set_gdbarch_stap_register_indirection_prefix (gdbarch, "(");
-  set_gdbarch_stap_register_indirection_suffix (gdbarch, ")");
-  set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);
-
-  return gdbarch;
-}
-
-
-extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
-
-void
-_initialize_s390_tdep (void)
-{
-  /* Hook us into the gdbarch mechanism.  */
-  register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
-
-  /* Initialize the GNU/Linux target descriptions.  */
-  initialize_tdesc_s390_linux32 ();
-  initialize_tdesc_s390_linux32v1 ();
-  initialize_tdesc_s390_linux32v2 ();
-  initialize_tdesc_s390_linux64 ();
-  initialize_tdesc_s390_linux64v1 ();
-  initialize_tdesc_s390_linux64v2 ();
-  initialize_tdesc_s390_te_linux64 ();
-  initialize_tdesc_s390x_linux64 ();
-  initialize_tdesc_s390x_linux64v1 ();
-  initialize_tdesc_s390x_linux64v2 ();
-  initialize_tdesc_s390x_te_linux64 ();
-}
diff --git a/gdb/s390-tdep.h b/gdb/s390-tdep.h
deleted file mode 100644
index 69055e1..0000000
--- a/gdb/s390-tdep.h
+++ /dev/null
@@ -1,178 +0,0 @@
-/* Target-dependent code for GDB, the GNU debugger.
-   Copyright (C) 2003-2013 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef S390_TDEP_H
-#define S390_TDEP_H
-
-/* Hardware capabilities. */
-
-#ifndef HWCAP_S390_HIGH_GPRS
-#define HWCAP_S390_HIGH_GPRS 512
-#endif
-
-#ifndef HWCAP_S390_TE
-#define HWCAP_S390_TE 1024
-#endif
-
-/* Register information.  */
-
-/* Program Status Word.  */
-#define S390_PSWM_REGNUM 0
-#define S390_PSWA_REGNUM 1
-/* General Purpose Registers.  */
-#define S390_R0_REGNUM 2
-#define S390_R1_REGNUM 3
-#define S390_R2_REGNUM 4
-#define S390_R3_REGNUM 5
-#define S390_R4_REGNUM 6
-#define S390_R5_REGNUM 7
-#define S390_R6_REGNUM 8
-#define S390_R7_REGNUM 9
-#define S390_R8_REGNUM 10
-#define S390_R9_REGNUM 11
-#define S390_R10_REGNUM 12
-#define S390_R11_REGNUM 13
-#define S390_R12_REGNUM 14
-#define S390_R13_REGNUM 15
-#define S390_R14_REGNUM 16
-#define S390_R15_REGNUM 17
-/* Access Registers.  */
-#define S390_A0_REGNUM 18
-#define S390_A1_REGNUM 19
-#define S390_A2_REGNUM 20
-#define S390_A3_REGNUM 21
-#define S390_A4_REGNUM 22
-#define S390_A5_REGNUM 23
-#define S390_A6_REGNUM 24
-#define S390_A7_REGNUM 25
-#define S390_A8_REGNUM 26
-#define S390_A9_REGNUM 27
-#define S390_A10_REGNUM 28
-#define S390_A11_REGNUM 29
-#define S390_A12_REGNUM 30
-#define S390_A13_REGNUM 31
-#define S390_A14_REGNUM 32
-#define S390_A15_REGNUM 33
-/* Floating Point Control Word.  */
-#define S390_FPC_REGNUM 34
-/* Floating Point Registers.  */
-#define S390_F0_REGNUM 35
-#define S390_F1_REGNUM 36
-#define S390_F2_REGNUM 37
-#define S390_F3_REGNUM 38
-#define S390_F4_REGNUM 39
-#define S390_F5_REGNUM 40
-#define S390_F6_REGNUM 41
-#define S390_F7_REGNUM 42
-#define S390_F8_REGNUM 43
-#define S390_F9_REGNUM 44
-#define S390_F10_REGNUM 45
-#define S390_F11_REGNUM 46
-#define S390_F12_REGNUM 47
-#define S390_F13_REGNUM 48
-#define S390_F14_REGNUM 49
-#define S390_F15_REGNUM 50
-/* General Purpose Register Upper Halves.  */
-#define S390_R0_UPPER_REGNUM 51
-#define S390_R1_UPPER_REGNUM 52
-#define S390_R2_UPPER_REGNUM 53
-#define S390_R3_UPPER_REGNUM 54
-#define S390_R4_UPPER_REGNUM 55
-#define S390_R5_UPPER_REGNUM 56
-#define S390_R6_UPPER_REGNUM 57
-#define S390_R7_UPPER_REGNUM 58
-#define S390_R8_UPPER_REGNUM 59
-#define S390_R9_UPPER_REGNUM 60
-#define S390_R10_UPPER_REGNUM 61
-#define S390_R11_UPPER_REGNUM 62
-#define S390_R12_UPPER_REGNUM 63
-#define S390_R13_UPPER_REGNUM 64
-#define S390_R14_UPPER_REGNUM 65
-#define S390_R15_UPPER_REGNUM 66
-/* GNU/Linux-specific optional registers.  */
-#define S390_ORIG_R2_REGNUM 67
-#define S390_LAST_BREAK_REGNUM 68
-#define S390_SYSTEM_CALL_REGNUM 69
-/* Transaction diagnostic block.  */
-#define S390_TDB_DWORD0_REGNUM 70
-#define S390_TDB_ABORT_CODE_REGNUM 71
-#define S390_TDB_CONFLICT_TOKEN_REGNUM 72
-#define S390_TDB_ATIA_REGNUM 73
-#define S390_TDB_R0_REGNUM 74
-#define S390_TDB_R1_REGNUM 75
-#define S390_TDB_R2_REGNUM 76
-#define S390_TDB_R3_REGNUM 77
-#define S390_TDB_R4_REGNUM 78
-#define S390_TDB_R5_REGNUM 79
-#define S390_TDB_R6_REGNUM 80
-#define S390_TDB_R7_REGNUM 81
-#define S390_TDB_R8_REGNUM 82
-#define S390_TDB_R9_REGNUM 83
-#define S390_TDB_R10_REGNUM 84
-#define S390_TDB_R11_REGNUM 85
-#define S390_TDB_R12_REGNUM 86
-#define S390_TDB_R13_REGNUM 87
-#define S390_TDB_R14_REGNUM 88
-#define S390_TDB_R15_REGNUM 89
-/* Total.  */
-#define S390_NUM_REGS 90
-
-/* Special register usage.  */
-#define S390_SP_REGNUM S390_R15_REGNUM
-#define S390_RETADDR_REGNUM S390_R14_REGNUM
-#define S390_FRAME_REGNUM S390_R11_REGNUM
-
-#define S390_IS_GREGSET_REGNUM(i)					\
-  (((i) >= S390_PSWM_REGNUM && (i) <= S390_A15_REGNUM)			\
-   || ((i) >= S390_R0_UPPER_REGNUM && (i) <= S390_R15_UPPER_REGNUM)	\
-   || (i) == S390_ORIG_R2_REGNUM)
-
-#define S390_IS_FPREGSET_REGNUM(i)			\
-  ((i) >= S390_FPC_REGNUM && (i) <= S390_F15_REGNUM)
-
-#define S390_IS_TDBREGSET_REGNUM(i)				\
-  ((i) >= S390_TDB_DWORD0_REGNUM && (i) <= S390_TDB_R15_REGNUM)
-
-/* Core file register sets, defined in s390-tdep.c.  */
-#define s390_sizeof_gregset 0x90
-extern const short s390_regmap_gregset[];
-#define s390x_sizeof_gregset 0xd8
-extern const short s390x_regmap_gregset[];
-#define s390_sizeof_fpregset 0x88
-extern const short s390_regmap_fpregset[];
-extern const short s390_regmap_last_break[];
-extern const short s390x_regmap_last_break[];
-extern const short s390_regmap_system_call[];
-extern const short s390_regmap_tdb[];
-#define s390_sizeof_tdbregset 0x100
-
-/* GNU/Linux target descriptions.  */
-extern struct target_desc *tdesc_s390_linux32;
-extern struct target_desc *tdesc_s390_linux32v1;
-extern struct target_desc *tdesc_s390_linux32v2;
-extern struct target_desc *tdesc_s390_linux64;
-extern struct target_desc *tdesc_s390_linux64v1;
-extern struct target_desc *tdesc_s390_linux64v2;
-extern struct target_desc *tdesc_s390_te_linux64;
-extern struct target_desc *tdesc_s390x_linux64;
-extern struct target_desc *tdesc_s390x_linux64v1;
-extern struct target_desc *tdesc_s390x_linux64v2;
-extern struct target_desc *tdesc_s390x_te_linux64;
-
-#endif
-
-- 
1.7.11.4



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