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[binutils-gdb] s390: Split up s390-linux-tdep.c into two files


https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d6e5894564754ed81faaa3dc92f0cc0e90d7994b

commit d6e5894564754ed81faaa3dc92f0cc0e90d7994b
Author: Philipp Rudo <prudo@linux.vnet.ibm.com>
Date:   Tue Jan 23 13:37:43 2018 +0100

    s390: Split up s390-linux-tdep.c into two files
    
    Currently all target dependent code for s390 is in one file,
    s390-linux-tdep.c.  This includes code general for the architecture as
    well as code specific for uses in GNU/Linux (user space).  Up until now
    this was OK as GNU/Linux was the only supported OS.  In preparation to
    support the new Linux kernel 'OS' split up the existing s390 code into a
    general s390-tdep and a GNU/Linux-specific s390-linux-tdep.
    
    Note: The record-replay feature will be moved in a separate patch.  This
    is simply due to the fact that the combined patch would be too large for
    the mailing list.  This requires setting the process_record hook during
    OSABI init to keep the code bisectable.  The patch moving record-replay
    cleans up this hack.
    
    gdb/ChangeLog:
    
    	* s390-linux-nat.c (s390-tdep.h): New include.
    	* Makefile.in (ALL_TARGET_OBS): Add s390-tdep.o.
    	(HFILES_NO_SRCDIR): Add s390-tdep.h.
    	(ALLDEPFILES): Add s390-tdep.c.
    	* configure.tgt (s390*-*-linux*): Add s390-tdep.o.
    	* s390-linux-tdep.h (HWCAP_S390_*, S390_*_REGNUM): Move to...
    	* s390-tdep.h: ...this.  New file.
    	* s390-linux-tdep.c (s390-tdep.h): New include.
    	(_initialize_s390_tdep): Rename to...
    	(_initialize_s390_linux_tdep): ...this and adjust.
    	(s390_abi_kind, s390_vector_abi_kind, gdbarch_tdep)
    	(enum named opcodes, S390_NUM_GPRS, S390_NUM_FPRS): Move to
    	s390-tdep.h.
    	(s390_break_insn, s390_breakpoint, s390_readinstruction, is_ri)
    	(is_ril, is_rr, is_rre, is_rs, is_rsy, is_rx, is_rxy)
    	(s390_is_partial_instruction, s390_software_single_step)
    	(is_non_branch_ril, s390_displaced_step_copy_insn)
    	(s390_displaced_step_fixup, s390_displaced_step_hw_singlestep)
    	(s390_prologue_data, s390_addr, s390_store, s390_load)
    	(s390_check_for_saved, s390_analyze_prologue, s390_skip_prologue)
    	(s390_register_call_saved, s390_guess_tracepoint_registers)
    	(s390_register_name, s390_dwarf_regmap, s390_dwarf_reg_to_regnum)
    	(regnum_is_gpr_full, regnum_is_vxr_full, s390_value_from_register)
    	(s390_pseudo_register_name, s390_pseudo_register_type)
    	(s390_pseudo_register_read, s390_pseudo_register_write)
    	(s390_pseudo_register_reggroup_p, s390_ax_pseudo_register_collect)
    	(s390_ax_pseudo_register_push_stack, s390_gen_return_address)
    	(s390_addr_bits_remove, s390_address_class_type_flags)
    	(s390_address_class_type_flags_to_name)
    	(s390_address_class_name_to_type_flags, s390_effective_inner_type)
    	(s390_function_arg_float, s390_function_arg_vector)
    	(is_power_of_two, s390_function_arg_integer, s390_arg_state)
    	(s390_handle_arg, s390_push_dummy_call, s390_dummy_id)
    	(s390_frame_align, s390_register_return_value, s390_return_value)
    	(s390_stack_frame_destroyed_p, s390_unwind_pc, s390_unwind_sp)
    	(s390_unwind_pseudo_register, s390_adjust_frame_regnum)
    	(s390_dwarf2_prev_register, s390_dwarf2_frame_init_reg)
    	(s390_trad_frame_prev_register, s390_unwind_cache)
    	(s390_prologue_frame_unwind_cache)
    	(s390_backchain_frame_unwind_cache, s390_frame_unwind_cache)
    	(s390_frame_this_id, s390_frame_prev_register, s390_frame_unwind)
    	(s390_stub_unwind_cache, s390_stub_frame_unwind_cache)
    	(s390_stub_frame_this_id, s390_stub_frame_prev_register)
    	(s390_stub_frame_sniffer, s390_stub_frame_unwind)
    	(s390_frame_base_address, s390_local_base_address)
    	(s390_frame_base, s390_gcc_target_options)
    	(s390_gnu_triplet_regexp, s390_stap_is_single_operand)
    	(s390_validate_reg_range, s390_tdesc_valid)
    	(s390_gdbarch_tdep_alloc, s390_gdbarch_init): Move to...
    	* s390-tdep.c: ...this.  New file.

Diff:
---
 gdb/ChangeLog         |   53 +
 gdb/Makefile.in       |    3 +
 gdb/configure.tgt     |    4 +-
 gdb/s390-linux-nat.c  |    1 +
 gdb/s390-linux-tdep.c | 3772 ++++---------------------------------------------
 gdb/s390-linux-tdep.h |  176 +--
 gdb/s390-tdep.c       | 3159 +++++++++++++++++++++++++++++++++++++++++
 gdb/s390-tdep.h       |  318 +++++
 8 files changed, 3856 insertions(+), 3630 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 05cb6de..cd9aa27 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,58 @@
 2018-01-23  Philipp Rudo  <prudo@linux.vnet.ibm.com>
 
+	* s390-linux-nat.c (s390-tdep.h): New include.
+	* Makefile.in (ALL_TARGET_OBS): Add s390-tdep.o.
+	(HFILES_NO_SRCDIR): Add s390-tdep.h.
+	(ALLDEPFILES): Add s390-tdep.c.
+	* configure.tgt (s390*-*-linux*): Add s390-tdep.o.
+	* s390-linux-tdep.h (HWCAP_S390_*, S390_*_REGNUM): Move to...
+	* s390-tdep.h: ...this.  New file.
+	* s390-linux-tdep.c (s390-tdep.h): New include.
+	(_initialize_s390_tdep): Rename to...
+	(_initialize_s390_linux_tdep): ...this and adjust.
+	(s390_abi_kind, s390_vector_abi_kind, gdbarch_tdep)
+	(enum named opcodes, S390_NUM_GPRS, S390_NUM_FPRS): Move to
+	s390-tdep.h.
+	(s390_break_insn, s390_breakpoint, s390_readinstruction, is_ri)
+	(is_ril, is_rr, is_rre, is_rs, is_rsy, is_rx, is_rxy)
+	(s390_is_partial_instruction, s390_software_single_step)
+	(is_non_branch_ril, s390_displaced_step_copy_insn)
+	(s390_displaced_step_fixup, s390_displaced_step_hw_singlestep)
+	(s390_prologue_data, s390_addr, s390_store, s390_load)
+	(s390_check_for_saved, s390_analyze_prologue, s390_skip_prologue)
+	(s390_register_call_saved, s390_guess_tracepoint_registers)
+	(s390_register_name, s390_dwarf_regmap, s390_dwarf_reg_to_regnum)
+	(regnum_is_gpr_full, regnum_is_vxr_full, s390_value_from_register)
+	(s390_pseudo_register_name, s390_pseudo_register_type)
+	(s390_pseudo_register_read, s390_pseudo_register_write)
+	(s390_pseudo_register_reggroup_p, s390_ax_pseudo_register_collect)
+	(s390_ax_pseudo_register_push_stack, s390_gen_return_address)
+	(s390_addr_bits_remove, s390_address_class_type_flags)
+	(s390_address_class_type_flags_to_name)
+	(s390_address_class_name_to_type_flags, s390_effective_inner_type)
+	(s390_function_arg_float, s390_function_arg_vector)
+	(is_power_of_two, s390_function_arg_integer, s390_arg_state)
+	(s390_handle_arg, s390_push_dummy_call, s390_dummy_id)
+	(s390_frame_align, s390_register_return_value, s390_return_value)
+	(s390_stack_frame_destroyed_p, s390_unwind_pc, s390_unwind_sp)
+	(s390_unwind_pseudo_register, s390_adjust_frame_regnum)
+	(s390_dwarf2_prev_register, s390_dwarf2_frame_init_reg)
+	(s390_trad_frame_prev_register, s390_unwind_cache)
+	(s390_prologue_frame_unwind_cache)
+	(s390_backchain_frame_unwind_cache, s390_frame_unwind_cache)
+	(s390_frame_this_id, s390_frame_prev_register, s390_frame_unwind)
+	(s390_stub_unwind_cache, s390_stub_frame_unwind_cache)
+	(s390_stub_frame_this_id, s390_stub_frame_prev_register)
+	(s390_stub_frame_sniffer, s390_stub_frame_unwind)
+	(s390_frame_base_address, s390_local_base_address)
+	(s390_frame_base, s390_gcc_target_options)
+	(s390_gnu_triplet_regexp, s390_stap_is_single_operand)
+	(s390_validate_reg_range, s390_tdesc_valid)
+	(s390_gdbarch_tdep_alloc, s390_gdbarch_init): Move to...
+	* s390-tdep.c: ...this.  New file.
+
+2018-01-23  Philipp Rudo  <prudo@linux.vnet.ibm.com>
+
 	* s390-linux-tdep.c (gdbarch_tdep.s390_syscall_record): New hook.
 	(s390_process_record, s390_gdbarch_tdep_alloc)
 	(s390_linux_init_abi_any): Use/set new hook.
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 364ea7a..0f87398 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -753,6 +753,7 @@ ALL_TARGET_OBS = \
 	rs6000-tdep.o \
 	rx-tdep.o \
 	s390-linux-tdep.o \
+	s390-tdep.o \
 	score-tdep.o \
 	sh-linux-tdep.o \
 	sh-nbsd-tdep.o \
@@ -1328,6 +1329,7 @@ HFILES_NO_SRCDIR = \
 	rs6000-aix-tdep.h \
 	rs6000-tdep.h \
 	s390-linux-tdep.h \
+	s390-tdep.h \
 	score-tdep.h \
 	selftest-arch.h \
 	sentinel-frame.h \
@@ -2336,6 +2338,7 @@ ALLDEPFILES = \
 	rx-tdep.c \
 	s390-linux-nat.c \
 	s390-linux-tdep.c \
+	s390-tdep.c \
 	score-tdep.c \
 	ser-go32.c \
 	ser-mingw.c \
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index dbd9114..122baf3 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -515,8 +515,8 @@ powerpc*-*-*)
 
 s390*-*-linux*)
 	# Target: S390 running Linux
-	gdb_target_obs="s390-linux-tdep.o solib-svr4.o linux-tdep.o \
-			linux-record.o symfile-mem.o"
+	gdb_target_obs="s390-linux-tdep.o s390-tdep.o solib-svr4.o \
+			linux-tdep.o linux-record.o symfile-mem.o"
 	build_gdbserver=yes
 	;;
 
diff --git a/gdb/s390-linux-nat.c b/gdb/s390-linux-nat.c
index 8a3fcff..14086faa 100644
--- a/gdb/s390-linux-nat.c
+++ b/gdb/s390-linux-nat.c
@@ -30,6 +30,7 @@
 #include "nat/linux-ptrace.h"
 #include "gdbcmd.h"
 
+#include "s390-tdep.h"
 #include "s390-linux-tdep.h"
 #include "elf/common.h"
 
diff --git a/gdb/s390-linux-tdep.c b/gdb/s390-linux-tdep.c
index b61a249..f6d2b62 100644
--- a/gdb/s390-linux-tdep.c
+++ b/gdb/s390-linux-tdep.c
@@ -1,4 +1,4 @@
-/* Target-dependent code for GDB, the GNU debugger.
+/* Target-dependent code for GNU/Linux on s390.
 
    Copyright (C) 2001-2018 Free Software Foundation, Inc.
 
@@ -43,6 +43,7 @@
 #include "solib-svr4.h"
 #include "prologue-value.h"
 #include "linux-tdep.h"
+#include "s390-tdep.h"
 #include "s390-linux-tdep.h"
 #include "linux-record.h"
 #include "record-full.h"
@@ -81,82 +82,6 @@
 #define XML_SYSCALL_FILENAME_S390 "syscalls/s390-linux.xml"
 #define XML_SYSCALL_FILENAME_S390X "syscalls/s390x-linux.xml"
 
-/* Holds the current set of options to be passed to the disassembler.  */
-static char *s390_disassembler_options;
-
-enum s390_abi_kind
-{
-  ABI_NONE,
-  ABI_LINUX_S390,
-  ABI_LINUX_ZSERIES
-};
-
-enum s390_vector_abi_kind
-{
-  S390_VECTOR_ABI_NONE,
-  S390_VECTOR_ABI_128
-};
-
-/* The tdep structure.  */
-
-struct gdbarch_tdep
-{
-  /* Target description.  */
-  const struct target_desc *tdesc;
-
-  /* ABI version.  */
-  enum s390_abi_kind abi;
-
-  /* Vector ABI.  */
-  enum s390_vector_abi_kind vector_abi;
-
-  /* Pseudo register numbers.  */
-  int gpr_full_regnum;
-  int pc_regnum;
-  int cc_regnum;
-  int v0_full_regnum;
-
-  bool have_upper;
-  bool have_linux_v1;
-  bool have_linux_v2;
-  bool have_tdb;
-  bool have_vx;
-  bool have_gs;
-
-  /* Hook to record OS specific systemcall.  */
-  int (*s390_syscall_record) (struct regcache *regcache, LONGEST svc_number);
-};
-
-
-/* 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)
 {
@@ -183,2324 +108,285 @@ s390_write_pc (struct regcache *regcache, CORE_ADDR pc)
     regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);
 }
 
-/* The "guess_tracepoint_registers" gdbarch method.  */
+/* Maps for register sets.  */
 
-static void
-s390_guess_tracepoint_registers (struct gdbarch *gdbarch,
-				 struct regcache *regcache,
-				 CORE_ADDR addr)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  int sz = register_size (gdbarch, S390_PSWA_REGNUM);
-  gdb_byte *reg = (gdb_byte *) alloca (sz);
-  ULONGEST pswm, pswa;
+static const struct regcache_map_entry s390_gregmap[] =
+  {
+    { 1, S390_PSWM_REGNUM },
+    { 1, S390_PSWA_REGNUM },
+    { 16, S390_R0_REGNUM },
+    { 16, S390_A0_REGNUM },
+    { 1, S390_ORIG_R2_REGNUM },
+    { 0 }
+  };
 
-  /* Set PSWA from the location and a default PSWM (the only part we're
-     unlikely to get right is the CC).  */
-  if (tdep->abi == ABI_LINUX_S390)
-    {
-      /* 31-bit PSWA needs high bit set (it's very unlikely the target
-	 was in 24-bit mode).  */
-      pswa = addr | 0x80000000UL;
-      pswm = 0x070d0000UL;
-    }
-  else
-    {
-      pswa = addr;
-      pswm = 0x0705000180000000ULL;
-    }
+static const struct regcache_map_entry s390_fpregmap[] =
+  {
+    { 1, S390_FPC_REGNUM, 8 },
+    { 16, S390_F0_REGNUM, 8 },
+    { 0 }
+  };
 
-  store_unsigned_integer (reg, sz, gdbarch_byte_order (gdbarch), pswa);
-  regcache_raw_supply (regcache, S390_PSWA_REGNUM, reg);
+static const struct regcache_map_entry s390_regmap_upper[] =
+  {
+    { 16, S390_R0_UPPER_REGNUM, 4 },
+    { 0 }
+  };
 
-  store_unsigned_integer (reg, sz, gdbarch_byte_order (gdbarch), pswm);
-  regcache_raw_supply (regcache, S390_PSWM_REGNUM, reg);
-}
+static const struct regcache_map_entry s390_regmap_last_break[] =
+  {
+    { 1, REGCACHE_MAP_SKIP, 4 },
+    { 1, S390_LAST_BREAK_REGNUM, 4 },
+    { 0 }
+  };
 
+static const struct regcache_map_entry s390x_regmap_last_break[] =
+  {
+    { 1, S390_LAST_BREAK_REGNUM, 8 },
+    { 0 }
+  };
 
-/* DWARF Register Mapping.  */
+static const struct regcache_map_entry s390_regmap_system_call[] =
+  {
+    { 1, S390_SYSTEM_CALL_REGNUM, 4 },
+    { 0 }
+  };
 
-static const short s390_dwarf_regmap[] =
-{
-  /* 0-15: 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,
-
-  /* 16-31: Floating Point Registers / Vector Registers 0-15. */
-  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,
-
-  /* 32-47: Control Registers (not mapped).  */
-  -1, -1, -1, -1, -1, -1, -1, -1,
-  -1, -1, -1, -1, -1, -1, -1, -1,
-
-  /* 48-63: 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,
-
-  /* 64-65: Program Status Word.  */
-  S390_PSWM_REGNUM,
-  S390_PSWA_REGNUM,
-
-  /* 66-67: Reserved.  */
-  -1, -1,
-
-  /* 68-83: Vector Registers 16-31.  */
-  S390_V16_REGNUM, S390_V18_REGNUM, S390_V20_REGNUM, S390_V22_REGNUM,
-  S390_V17_REGNUM, S390_V19_REGNUM, S390_V21_REGNUM, S390_V23_REGNUM,
-  S390_V24_REGNUM, S390_V26_REGNUM, S390_V28_REGNUM, S390_V30_REGNUM,
-  S390_V25_REGNUM, S390_V27_REGNUM, S390_V29_REGNUM, S390_V31_REGNUM,
-
-  /* End of "official" DWARF registers.  The remainder of the map is
-     for GDB internal use only.  */
-
-  /* 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,
-};
+static const struct regcache_map_entry s390_regmap_tdb[] =
+  {
+    { 1, S390_TDB_DWORD0_REGNUM, 8 },
+    { 1, S390_TDB_ABORT_CODE_REGNUM, 8 },
+    { 1, S390_TDB_CONFLICT_TOKEN_REGNUM, 8 },
+    { 1, S390_TDB_ATIA_REGNUM, 8 },
+    { 12, REGCACHE_MAP_SKIP, 8 },
+    { 16, S390_TDB_R0_REGNUM, 8 },
+    { 0 }
+  };
 
-enum { s390_dwarf_reg_r0l = ARRAY_SIZE (s390_dwarf_regmap) - 16 };
+static const struct regcache_map_entry s390_regmap_vxrs_low[] =
+  {
+    { 16, S390_V0_LOWER_REGNUM, 8 },
+    { 0 }
+  };
 
-/* 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);
-  int gdb_reg = -1;
+static const struct regcache_map_entry s390_regmap_vxrs_high[] =
+  {
+    { 16, S390_V16_REGNUM, 16 },
+    { 0 }
+  };
 
-  /* 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
-     special register numbers to access GPRs.  */
-  if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
-    return tdep->gpr_full_regnum + reg;
+static const struct regcache_map_entry s390_regmap_gs[] =
+  {
+    { 1, REGCACHE_MAP_SKIP, 8 },
+    { 1, S390_GSD_REGNUM, 8 },
+    { 1, S390_GSSM_REGNUM, 8 },
+    { 1, S390_GSEPLA_REGNUM, 8 },
+    { 0 }
+  };
 
-  if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
-    gdb_reg = s390_dwarf_regmap[reg];
+static const struct regcache_map_entry s390_regmap_gsbc[] =
+  {
+    { 1, REGCACHE_MAP_SKIP, 8 },
+    { 1, S390_BC_GSD_REGNUM, 8 },
+    { 1, S390_BC_GSSM_REGNUM, 8 },
+    { 1, S390_BC_GSEPLA_REGNUM, 8 },
+    { 0 }
+  };
 
-  if (tdep->v0_full_regnum == -1)
-    {
-      if (gdb_reg >= S390_V16_REGNUM && gdb_reg <= S390_V31_REGNUM)
-	gdb_reg = -1;
-    }
-  else
-    {
-      if (gdb_reg >= S390_F0_REGNUM && gdb_reg <= S390_F15_REGNUM)
-	gdb_reg = gdb_reg - S390_F0_REGNUM + tdep->v0_full_regnum;
-    }
 
-  return gdb_reg;
-}
+/* Supply the TDB regset.  Like regcache_supply_regset, but invalidate
+   the TDB registers unless the TDB format field is valid.  */
 
-/* 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)
+static void
+s390_supply_tdb_regset (const struct regset *regset, struct regcache *regcache,
+		    int regnum, const void *regs, size_t len)
 {
-  /* See s390_dwarf_reg_to_regnum for comments.  */
-  return (num >= 0 && num < 16) ? num + s390_dwarf_reg_r0l : num;
-}
+  ULONGEST tdw;
+  enum register_status ret;
 
+  regcache_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)
+    regcache_supply_regset (regset, regcache, regnum, NULL, len);
+}
 
-/* Pseudo registers.  */
+const struct regset s390_gregset = {
+  s390_gregmap,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-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);
-}
+const struct regset s390_fpregset = {
+  s390_fpregmap,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-/* Check whether REGNUM indicates a full vector register (v0-v15).
-   These pseudo-registers are composed of f0-f15 and v0l-v15l.  */
+static const struct regset s390_upper_regset = {
+  s390_regmap_upper,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-static int
-regnum_is_vxr_full (struct gdbarch_tdep *tdep, int regnum)
-{
-  return (tdep->v0_full_regnum != -1
-	  && regnum >= tdep->v0_full_regnum
-	  && regnum <= tdep->v0_full_regnum + 15);
-}
+const struct regset s390_last_break_regset = {
+  s390_regmap_last_break,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-/* Return the name of register REGNO.  Return the empty string for
-   registers that shouldn't be visible.  */
+const struct regset s390x_last_break_regset = {
+  s390x_regmap_last_break,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-static const char *
-s390_register_name (struct gdbarch *gdbarch, int regnum)
-{
-  if (regnum >= S390_V0_LOWER_REGNUM
-      && regnum <= S390_V15_LOWER_REGNUM)
-    return "";
-  return tdesc_register_name (gdbarch, regnum);
-}
+const struct regset s390_system_call_regset = {
+  s390_regmap_system_call,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-static const char *
-s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+const struct regset s390_tdb_regset = {
+  s390_regmap_tdb,
+  s390_supply_tdb_regset,
+  regcache_collect_regset
+};
 
-  if (regnum == tdep->pc_regnum)
-    return "pc";
+const struct regset s390_vxrs_low_regset = {
+  s390_regmap_vxrs_low,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-  if (regnum == tdep->cc_regnum)
-    return "cc";
+const struct regset s390_vxrs_high_regset = {
+  s390_regmap_vxrs_high,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-  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];
-    }
+const struct regset s390_gs_regset = {
+  s390_regmap_gs,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-  if (regnum_is_vxr_full (tdep, regnum))
-    {
-      static const char *full_name[] = {
-	"v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7",
-	"v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15"
-      };
-      return full_name[regnum - tdep->v0_full_regnum];
-    }
+const struct regset s390_gsbc_regset = {
+  s390_regmap_gsbc,
+  regcache_supply_regset,
+  regcache_collect_regset
+};
 
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
+/* Iterate over supported core file register note sections. */
 
-static struct type *
-s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
+static void
+s390_iterate_over_regset_sections (struct gdbarch *gdbarch,
+				   iterate_over_regset_sections_cb *cb,
+				   void *cb_data,
+				   const struct regcache *regcache)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  const int gregset_size = (tdep->abi == ABI_LINUX_S390 ?
+			    s390_sizeof_gregset : s390x_sizeof_gregset);
 
-  if (regnum == tdep->pc_regnum)
-    return builtin_type (gdbarch)->builtin_func_ptr;
-
-  if (regnum == tdep->cc_regnum)
-    return builtin_type (gdbarch)->builtin_int;
+  cb (".reg", gregset_size, &s390_gregset, NULL, cb_data);
+  cb (".reg2", s390_sizeof_fpregset, &s390_fpregset, NULL, cb_data);
 
-  if (regnum_is_gpr_full (tdep, regnum))
-    return builtin_type (gdbarch)->builtin_uint64;
+  if (tdep->abi == ABI_LINUX_S390 && tdep->gpr_full_regnum != -1)
+    cb (".reg-s390-high-gprs", 16 * 4, &s390_upper_regset,
+	"s390 GPR upper halves", cb_data);
 
-  if (regnum_is_vxr_full (tdep, regnum))
-    return tdesc_find_type (gdbarch, "vec128");
+  if (tdep->have_linux_v1)
+    cb (".reg-s390-last-break", 8,
+	(gdbarch_ptr_bit (gdbarch) == 32
+	 ? &s390_last_break_regset : &s390x_last_break_regset),
+	"s390 last-break address", cb_data);
 
-  internal_error (__FILE__, __LINE__, _("invalid regnum"));
-}
+  if (tdep->have_linux_v2)
+    cb (".reg-s390-system-call", 4, &s390_system_call_regset,
+	"s390 system-call", cb_data);
 
-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 regcache is set, we are in "write" (gcore) mode.  In this
+     case, don't iterate over the TDB unless its registers are
+     available.  */
+  if (tdep->have_tdb
+      && (regcache == NULL
+	  || REG_VALID == regcache_register_status (regcache,
+						    S390_TDB_DWORD0_REGNUM)))
+    cb (".reg-s390-tdb", s390_sizeof_tdbregset, &s390_tdb_regset,
+	"s390 TDB", cb_data);
 
-  if (regnum == tdep->pc_regnum)
+  if (tdep->v0_full_regnum != -1)
     {
-      enum register_status status;
-
-      status = regcache->raw_read (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;
+      cb (".reg-s390-vxrs-low", 16 * 8, &s390_vxrs_low_regset,
+	  "s390 vector registers 0-15 lower half", cb_data);
+      cb (".reg-s390-vxrs-high", 16 * 16, &s390_vxrs_high_regset,
+	  "s390 vector registers 16-31", cb_data);
     }
 
-  if (regnum == tdep->cc_regnum)
+  /* Iterate over the guarded-storage regsets if in "read" mode, or if
+     their registers are available.  */
+  if (tdep->have_gs)
     {
-      enum register_status status;
-
-      status = regcache->raw_read (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 (S390_R0_REGNUM + regnum, &val);
-      if (status == REG_VALID)
-	status = regcache->raw_read (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;
-    }
-
-  if (regnum_is_vxr_full (tdep, regnum))
-    {
-      enum register_status status;
-
-      regnum -= tdep->v0_full_regnum;
-
-      status = regcache->raw_read (S390_F0_REGNUM + regnum, buf);
-      if (status == REG_VALID)
-	status = regcache->raw_read (S390_V0_LOWER_REGNUM + regnum, buf + 8);
-      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;
-    }
+      if (regcache == NULL
+	  || REG_VALID == regcache_register_status (regcache,
+						    S390_GSD_REGNUM))
+	cb (".reg-s390-gs-cb", 4 * 8, &s390_gs_regset,
+	    "s390 guarded-storage registers", cb_data);
 
-  if (regnum_is_vxr_full (tdep, regnum))
-    {
-      regnum -= tdep->v0_full_regnum;
-      regcache_raw_write (regcache, S390_F0_REGNUM + regnum, buf);
-      regcache_raw_write (regcache, S390_V0_LOWER_REGNUM + regnum, buf + 8);
-      return;
+      if (regcache == NULL
+	  || REG_VALID == regcache_register_status (regcache,
+						    S390_BC_GSD_REGNUM))
+	cb (".reg-s390-gs-bc", 4 * 8, &s390_gsbc_regset,
+	    "s390 guarded-storage broadcast control", cb_data);
     }
-
-  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.  The
-   same applies to a 'float' value within a vector.  */
-
-static struct value *
-s390_value_from_register (struct gdbarch *gdbarch, struct type *type,
-			  int regnum, struct frame_id frame_id)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  struct value *value = default_value_from_register (gdbarch, type,
-						     regnum, frame_id);
-  check_typedef (type);
-
-  if ((regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
-       && TYPE_LENGTH (type) < 8)
-      || regnum_is_vxr_full (tdep, regnum)
-      || (regnum >= S390_V16_REGNUM && regnum <= S390_V31_REGNUM))
-    set_value_offset (value, 0);
-
-  return value;
 }
 
-/* Register groups.  */
-
-static int
-s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
-				 struct reggroup *group)
+static const struct target_desc *
+s390_core_read_description (struct gdbarch *gdbarch,
+			    struct target_ops *target, bfd *abfd)
 {
-  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;
-
-  if (group == vector_reggroup)
-    return regnum_is_vxr_full (tdep, regnum);
-
-  if (group == general_reggroup && regnum_is_vxr_full (tdep, regnum))
-    return 0;
-
-  return default_register_reggroup_p (gdbarch, regnum, group);
-}
-
-/* The "ax_pseudo_register_collect" gdbarch method.  */
+  asection *section = bfd_get_section_by_name (abfd, ".reg");
+  CORE_ADDR hwcap = 0;
+  bool high_gprs, v1, v2, te, vx, gs;
 
-static int
-s390_ax_pseudo_register_collect (struct gdbarch *gdbarch,
-				 struct agent_expr *ax, int regnum)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  if (regnum == tdep->pc_regnum)
-    {
-      ax_reg_mask (ax, S390_PSWA_REGNUM);
-    }
-  else if (regnum == tdep->cc_regnum)
-    {
-      ax_reg_mask (ax, S390_PSWM_REGNUM);
-    }
-  else if (regnum_is_gpr_full (tdep, regnum))
-    {
-      regnum -= tdep->gpr_full_regnum;
-      ax_reg_mask (ax, S390_R0_REGNUM + regnum);
-      ax_reg_mask (ax, S390_R0_UPPER_REGNUM + regnum);
-    }
-  else if (regnum_is_vxr_full (tdep, regnum))
-    {
-      regnum -= tdep->v0_full_regnum;
-      ax_reg_mask (ax, S390_F0_REGNUM + regnum);
-      ax_reg_mask (ax, S390_V0_LOWER_REGNUM + regnum);
-    }
-  else
-    {
-      internal_error (__FILE__, __LINE__, _("invalid regnum"));
-    }
-  return 0;
-}
+  target_auxv_search (target, AT_HWCAP, &hwcap);
+  if (!section)
+    return NULL;
 
-/* The "ax_pseudo_register_push_stack" gdbarch method.  */
+  high_gprs = (bfd_get_section_by_name (abfd, ".reg-s390-high-gprs")
+	       != NULL);
+  v1 = (bfd_get_section_by_name (abfd, ".reg-s390-last-break") != NULL);
+  v2 = (bfd_get_section_by_name (abfd, ".reg-s390-system-call") != NULL);
+  vx = (hwcap & HWCAP_S390_VX);
+  te = (hwcap & HWCAP_S390_TE);
+  gs = (hwcap & HWCAP_S390_GS);
 
-static int
-s390_ax_pseudo_register_push_stack (struct gdbarch *gdbarch,
-				    struct agent_expr *ax, int regnum)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  if (regnum == tdep->pc_regnum)
-    {
-      ax_reg (ax, S390_PSWA_REGNUM);
-      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	{
-	  ax_zero_ext (ax, 31);
-	}
-    }
-  else if (regnum == tdep->cc_regnum)
+  switch (bfd_section_size (abfd, section))
     {
-      ax_reg (ax, S390_PSWM_REGNUM);
-      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	ax_const_l (ax, 12);
+    case s390_sizeof_gregset:
+      if (high_gprs)
+	return (gs ? tdesc_s390_gs_linux64 :
+		te && vx ? tdesc_s390_tevx_linux64 :
+		vx ? tdesc_s390_vx_linux64 :
+		te ? tdesc_s390_te_linux64 :
+		v2 ? tdesc_s390_linux64v2 :
+		v1 ? tdesc_s390_linux64v1 : tdesc_s390_linux64);
       else
-	ax_const_l (ax, 44);
-      ax_simple (ax, aop_rsh_unsigned);
-      ax_zero_ext (ax, 2);
-    }
-  else if (regnum_is_gpr_full (tdep, regnum))
-    {
-      regnum -= tdep->gpr_full_regnum;
-      ax_reg (ax, S390_R0_REGNUM + regnum);
-      ax_reg (ax, S390_R0_UPPER_REGNUM + regnum);
-      ax_const_l (ax, 32);
-      ax_simple (ax, aop_lsh);
-      ax_simple (ax, aop_bit_or);
-    }
-  else if (regnum_is_vxr_full (tdep, regnum))
-    {
-      /* Too large to stuff on the stack.  */
-      return 1;
-    }
-  else
-    {
-      internal_error (__FILE__, __LINE__, _("invalid regnum"));
-    }
-  return 0;
-}
-
-/* The "gen_return_address" gdbarch method.  Since this is supposed to be
-   just a best-effort method, and we don't really have the means to run
-   the full unwinder here, just collect the link register.  */
-
-static void
-s390_gen_return_address (struct gdbarch *gdbarch,
-			 struct agent_expr *ax, struct axs_value *value,
-			 CORE_ADDR scope)
-{
-  value->type = register_type (gdbarch, S390_R14_REGNUM);
-  value->kind = axs_lvalue_register;
-  value->u.reg = S390_R14_REGNUM;
-}
-
-
-/* A helper for s390_software_single_step, decides if an instruction
-   is a partial-execution instruction that needs to be executed until
-   completion when in record mode.  If it is, returns 1 and writes
-   instruction length to a pointer.  */
-
-static int
-s390_is_partial_instruction (struct gdbarch *gdbarch, CORE_ADDR loc, int *len)
-{
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  uint16_t insn;
-
-  insn = read_memory_integer (loc, 2, byte_order);
-
-  switch (insn >> 8)
-    {
-    case 0xa8: /* MVCLE */
-      *len = 4;
-      return 1;
-
-    case 0xeb:
-      {
-        insn = read_memory_integer (loc + 4, 2, byte_order);
-        if ((insn & 0xff) == 0x8e)
-          {
-            /* MVCLU */
-            *len = 6;
-            return 1;
-          }
-      }
-      break;
-    }
-
-  switch (insn)
-    {
-    case 0xb255: /* MVST */
-    case 0xb263: /* CMPSC */
-    case 0xb2a5: /* TRE */
-    case 0xb2a6: /* CU21 */
-    case 0xb2a7: /* CU12 */
-    case 0xb9b0: /* CU14 */
-    case 0xb9b1: /* CU24 */
-    case 0xb9b2: /* CU41 */
-    case 0xb9b3: /* CU42 */
-    case 0xb92a: /* KMF */
-    case 0xb92b: /* KMO */
-    case 0xb92f: /* KMC */
-    case 0xb92d: /* KMCTR */
-    case 0xb92e: /* KM */
-    case 0xb93c: /* PPNO */
-    case 0xb990: /* TRTT */
-    case 0xb991: /* TRTO */
-    case 0xb992: /* TROT */
-    case 0xb993: /* TROO */
-      *len = 4;
-      return 1;
-    }
-
-  return 0;
-}
-
-/* Implement the "software_single_step" gdbarch method, needed to single step
-   through instructions like MVCLE in record mode, to make sure they are
-   executed to completion.  Without that, record will save the full length
-   of destination buffer on every iteration, even though the CPU will only
-   process about 4kiB of it each time, leading to O(n**2) memory and time
-   complexity.  */
-
-static std::vector<CORE_ADDR>
-s390_software_single_step (struct regcache *regcache)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  CORE_ADDR loc = regcache_read_pc (regcache);
-  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  int len;
-  uint16_t insn;
-
-  /* Special handling only if recording.  */
-  if (!record_full_is_used ())
-    return {};
-
-  /* First, match a partial instruction.  */
-  if (!s390_is_partial_instruction (gdbarch, loc, &len))
-    return {};
-
-  loc += len;
-
-  /* Second, look for a branch back to it.  */
-  insn = read_memory_integer (loc, 2, byte_order);
-  if (insn != 0xa714) /* BRC with mask 1 */
-    return {};
-
-  insn = read_memory_integer (loc + 2, 2, byte_order);
-  if (insn != (uint16_t) -(len / 2))
-    return {};
-
-  loc += 4;
-
-  /* Found it, step past the whole thing.  */
-  return {loc};
-}
-
-static int
-s390_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
-				   struct displaced_step_closure *closure)
-{
-  return 1;
-}
-
-
-/* Maps for register sets.  */
-
-static const struct regcache_map_entry s390_gregmap[] =
-  {
-    { 1, S390_PSWM_REGNUM },
-    { 1, S390_PSWA_REGNUM },
-    { 16, S390_R0_REGNUM },
-    { 16, S390_A0_REGNUM },
-    { 1, S390_ORIG_R2_REGNUM },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_fpregmap[] =
-  {
-    { 1, S390_FPC_REGNUM, 8 },
-    { 16, S390_F0_REGNUM, 8 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_upper[] =
-  {
-    { 16, S390_R0_UPPER_REGNUM, 4 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_last_break[] =
-  {
-    { 1, REGCACHE_MAP_SKIP, 4 },
-    { 1, S390_LAST_BREAK_REGNUM, 4 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390x_regmap_last_break[] =
-  {
-    { 1, S390_LAST_BREAK_REGNUM, 8 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_system_call[] =
-  {
-    { 1, S390_SYSTEM_CALL_REGNUM, 4 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_tdb[] =
-  {
-    { 1, S390_TDB_DWORD0_REGNUM, 8 },
-    { 1, S390_TDB_ABORT_CODE_REGNUM, 8 },
-    { 1, S390_TDB_CONFLICT_TOKEN_REGNUM, 8 },
-    { 1, S390_TDB_ATIA_REGNUM, 8 },
-    { 12, REGCACHE_MAP_SKIP, 8 },
-    { 16, S390_TDB_R0_REGNUM, 8 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_vxrs_low[] =
-  {
-    { 16, S390_V0_LOWER_REGNUM, 8 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_vxrs_high[] =
-  {
-    { 16, S390_V16_REGNUM, 16 },
-    { 0 }
-  };
+	return (v2 ? tdesc_s390_linux32v2 :
+		v1 ? tdesc_s390_linux32v1 : tdesc_s390_linux32);
 
-static const struct regcache_map_entry s390_regmap_gs[] =
-  {
-    { 1, REGCACHE_MAP_SKIP, 8 },
-    { 1, S390_GSD_REGNUM, 8 },
-    { 1, S390_GSSM_REGNUM, 8 },
-    { 1, S390_GSEPLA_REGNUM, 8 },
-    { 0 }
-  };
-
-static const struct regcache_map_entry s390_regmap_gsbc[] =
-  {
-    { 1, REGCACHE_MAP_SKIP, 8 },
-    { 1, S390_BC_GSD_REGNUM, 8 },
-    { 1, S390_BC_GSSM_REGNUM, 8 },
-    { 1, S390_BC_GSEPLA_REGNUM, 8 },
-    { 0 }
-  };
-
-
-/* Supply the TDB regset.  Like regcache_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;
-
-  regcache_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)
-    regcache_supply_regset (regset, regcache, regnum, NULL, len);
-}
-
-const struct regset s390_gregset = {
-  s390_gregmap,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_fpregset = {
-  s390_fpregmap,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-static const struct regset s390_upper_regset = {
-  s390_regmap_upper,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_last_break_regset = {
-  s390_regmap_last_break,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390x_last_break_regset = {
-  s390x_regmap_last_break,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_system_call_regset = {
-  s390_regmap_system_call,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_tdb_regset = {
-  s390_regmap_tdb,
-  s390_supply_tdb_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_vxrs_low_regset = {
-  s390_regmap_vxrs_low,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_vxrs_high_regset = {
-  s390_regmap_vxrs_high,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_gs_regset = {
-  s390_regmap_gs,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-const struct regset s390_gsbc_regset = {
-  s390_regmap_gsbc,
-  regcache_supply_regset,
-  regcache_collect_regset
-};
-
-/* Iterate over supported core file register note sections. */
-
-static void
-s390_iterate_over_regset_sections (struct gdbarch *gdbarch,
-				   iterate_over_regset_sections_cb *cb,
-				   void *cb_data,
-				   const struct regcache *regcache)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  const int gregset_size = (tdep->abi == ABI_LINUX_S390 ?
-			    s390_sizeof_gregset : s390x_sizeof_gregset);
-
-  cb (".reg", gregset_size, &s390_gregset, NULL, cb_data);
-  cb (".reg2", s390_sizeof_fpregset, &s390_fpregset, NULL, cb_data);
-
-  if (tdep->abi == ABI_LINUX_S390 && tdep->gpr_full_regnum != -1)
-    cb (".reg-s390-high-gprs", 16 * 4, &s390_upper_regset,
-	"s390 GPR upper halves", cb_data);
-
-  if (tdep->have_linux_v1)
-    cb (".reg-s390-last-break", 8,
-	(gdbarch_ptr_bit (gdbarch) == 32
-	 ? &s390_last_break_regset : &s390x_last_break_regset),
-	"s390 last-break address", cb_data);
-
-  if (tdep->have_linux_v2)
-    cb (".reg-s390-system-call", 4, &s390_system_call_regset,
-	"s390 system-call", cb_data);
-
-  /* If regcache is set, we are in "write" (gcore) mode.  In this
-     case, don't iterate over the TDB unless its registers are
-     available.  */
-  if (tdep->have_tdb
-      && (regcache == NULL
-	  || REG_VALID == regcache_register_status (regcache,
-						    S390_TDB_DWORD0_REGNUM)))
-    cb (".reg-s390-tdb", s390_sizeof_tdbregset, &s390_tdb_regset,
-	"s390 TDB", cb_data);
-
-  if (tdep->v0_full_regnum != -1)
-    {
-      cb (".reg-s390-vxrs-low", 16 * 8, &s390_vxrs_low_regset,
-	  "s390 vector registers 0-15 lower half", cb_data);
-      cb (".reg-s390-vxrs-high", 16 * 16, &s390_vxrs_high_regset,
-	  "s390 vector registers 16-31", cb_data);
-    }
-
-  /* Iterate over the guarded-storage regsets if in "read" mode, or if
-     their registers are available.  */
-  if (tdep->have_gs)
-    {
-      if (regcache == NULL
-	  || REG_VALID == regcache_register_status (regcache,
-						    S390_GSD_REGNUM))
-	cb (".reg-s390-gs-cb", 4 * 8, &s390_gs_regset,
-	    "s390 guarded-storage registers", cb_data);
-
-      if (regcache == NULL
-	  || REG_VALID == regcache_register_status (regcache,
-						    S390_BC_GSD_REGNUM))
-	cb (".reg-s390-gs-bc", 4 * 8, &s390_gsbc_regset,
-	    "s390 guarded-storage broadcast control", cb_data);
-    }
-}
-
-static const struct target_desc *
-s390_core_read_description (struct gdbarch *gdbarch,
-			    struct target_ops *target, bfd *abfd)
-{
-  asection *section = bfd_get_section_by_name (abfd, ".reg");
-  CORE_ADDR hwcap = 0;
-  bool high_gprs, v1, v2, te, vx, gs;
-
-  target_auxv_search (target, AT_HWCAP, &hwcap);
-  if (!section)
-    return NULL;
-
-  high_gprs = (bfd_get_section_by_name (abfd, ".reg-s390-high-gprs")
-	       != NULL);
-  v1 = (bfd_get_section_by_name (abfd, ".reg-s390-last-break") != NULL);
-  v2 = (bfd_get_section_by_name (abfd, ".reg-s390-system-call") != NULL);
-  vx = (hwcap & HWCAP_S390_VX);
-  te = (hwcap & HWCAP_S390_TE);
-  gs = (hwcap & HWCAP_S390_GS);
-
-  switch (bfd_section_size (abfd, section))
-    {
-    case s390_sizeof_gregset:
-      if (high_gprs)
-	return (gs ? tdesc_s390_gs_linux64 :
-		te && vx ? tdesc_s390_tevx_linux64 :
-		vx ? tdesc_s390_vx_linux64 :
-		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 (gs ? tdesc_s390x_gs_linux64 :
-	      te && vx ? tdesc_s390x_tevx_linux64 :
-	      vx ? tdesc_s390x_vx_linux64 :
-	      te ? tdesc_s390x_te_linux64 :
-	      v2 ? tdesc_s390x_linux64v2 :
-	      v1 ? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);
+    case s390x_sizeof_gregset:
+      return (gs ? tdesc_s390x_gs_linux64 :
+	      te && vx ? tdesc_s390x_tevx_linux64 :
+	      vx ? tdesc_s390x_vx_linux64 :
+	      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,
-    op_svc   = 0x0a,
-  };
-
-
-/* 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_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 (!data->stack->store_would_trash (addr))
-    data->stack->store (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 data->stack->fetch (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 = (struct s390_prologue_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;
-
-  pv_area stack (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
-  scoped_restore restore_stack = make_scoped_restore (&data->stack, &stack);
-
-  /* Set up everything's initial value.  */
-  {
-    int i;
-
-    /* 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;
-	}
-
-      /* BRC/BRCL -- branch relative on condition.  Ignore "branch
-	 never", branch to following instruction, and "conditional
-	 trap" (BRC +2).  Otherwise terminate search.  */
-      else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2))
-	{
-	  if (r1 != 0 && i2 != 1 && i2 != 2)
-	    break;
-	}
-      else if (is_ril (insn, op1_brcl, op2_brcl, &r1, &i2))
-	{
-	  if (r1 != 0 && i2 != 3)
-	    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_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.  */
-  data->stack->scan (s390_check_for_saved, data);
-
-  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, func_addr;
-
-  if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
-    {
-      CORE_ADDR post_prologue_pc
-	= skip_prologue_using_sal (gdbarch, func_addr);
-      if (post_prologue_pc != 0)
-	return std::max (pc, post_prologue_pc);
-    }
-
-  skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
-  return skip_pc ? skip_pc : pc;
-}
-
-/* Implmement the stack_frame_destroyed_p gdbarch method.  */
-static int
-s390_stack_frame_destroyed_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.  */
-
-/* Return true if INSN is a non-branch RIL-b or RIL-c format
-   instruction.  */
-
-static int
-is_non_branch_ril (gdb_byte *insn)
-{
-  gdb_byte op1 = insn[0];
-
-  if (op1 == 0xc4)
-    {
-      gdb_byte op2 = insn[1] & 0x0f;
-
-      switch (op2)
-	{
-	case 0x02: /* llhrl */
-	case 0x04: /* lghrl */
-	case 0x05: /* lhrl */
-	case 0x06: /* llghrl */
-	case 0x07: /* sthrl */
-	case 0x08: /* lgrl */
-	case 0x0b: /* stgrl */
-	case 0x0c: /* lgfrl */
-	case 0x0d: /* lrl */
-	case 0x0e: /* llgfrl */
-	case 0x0f: /* strl */
-	  return 1;
-	}
-    }
-  else if (op1 == 0xc6)
-    {
-      gdb_byte op2 = insn[1] & 0x0f;
-
-      switch (op2)
-	{
-	case 0x00: /* exrl */
-	case 0x02: /* pfdrl */
-	case 0x04: /* cghrl */
-	case 0x05: /* chrl */
-	case 0x06: /* clghrl */
-	case 0x07: /* clhrl */
-	case 0x08: /* cgrl */
-	case 0x0a: /* clgrl */
-	case 0x0c: /* cgfrl */
-	case 0x0d: /* crl */
-	case 0x0e: /* clgfrl */
-	case 0x0f: /* clrl */
-	  return 1;
-	}
-    }
-
-  return 0;
-}
-
-typedef buf_displaced_step_closure s390_displaced_step_closure;
-
-/* Implementation of gdbarch_displaced_step_copy_insn.  */
-
-static struct displaced_step_closure *
-s390_displaced_step_copy_insn (struct gdbarch *gdbarch,
-			       CORE_ADDR from, CORE_ADDR to,
-			       struct regcache *regs)
-{
-  size_t len = gdbarch_max_insn_length (gdbarch);
-  std::unique_ptr<s390_displaced_step_closure> closure
-    (new s390_displaced_step_closure (len));
-  gdb_byte *buf = closure->buf.data ();
-
-  read_memory (from, buf, len);
-
-  /* Adjust the displacement field of PC-relative RIL instructions,
-     except branches.  The latter are handled in the fixup hook.  */
-  if (is_non_branch_ril (buf))
-    {
-      LONGEST offset;
-
-      offset = extract_signed_integer (buf + 2, 4, BFD_ENDIAN_BIG);
-      offset = (from - to + offset * 2) / 2;
-
-      /* If the instruction is too far from the jump pad, punt.  This
-	 will usually happen with instructions in shared libraries.
-	 We could probably support these by rewriting them to be
-	 absolute or fully emulating them.  */
-      if (offset < INT32_MIN || offset > INT32_MAX)
-	{
-	  /* Let the core fall back to stepping over the breakpoint
-	     in-line.  */
-	  if (debug_displaced)
-	    {
-	      fprintf_unfiltered (gdb_stdlog,
-				  "displaced: can't displaced step "
-				  "RIL instruction: offset %s out of range\n",
-				  plongest (offset));
-	    }
-
-	  return NULL;
-	}
-
-      store_signed_integer (buf + 2, 4, BFD_ENDIAN_BIG, offset);
-    }
-
-  write_memory (to, buf, len);
-
-  if (debug_displaced)
-    {
-      fprintf_unfiltered (gdb_stdlog, "displaced: copy %s->%s: ",
-                          paddress (gdbarch, from), paddress (gdbarch, to));
-      displaced_step_dump_bytes (gdb_stdlog, buf, len);
-    }
-
-  return closure.release ();
-}
-
-/* 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)
-{
-  /* Our closure is a copy of the instruction.  */
-  s390_displaced_step_closure *closure
-    = (s390_displaced_step_closure *) closure_;
-  gdb_byte *insn = closure->buf.data ();
-  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 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, adjust PC by negated displacement.  PC then
-     points right after the original instruction, except for PC-relative
-     branches, where it points to the adjusted branch target.  */
-  else
-    regcache_write_pc (regs, pc - to + from);
-
-  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 ...  */
-  if (!get_frame_func_if_available (this_frame, &info->func))
-    {
-      info->func = -1;
-      return 0;
-    }
-  func = info->func;
-
-  /* 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_stack_frame_destroyed_p on why this is
-	 not completely reliable ...  */
-      if (s390_stack_frame_destroyed_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;
-    }
-
-  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, tmp;
-  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);
-  if (!safe_read_memory_integer (reg, word_size, byte_order, &tmp))
-    tmp = 0;
-  backchain = (CORE_ADDR) tmp;
-
-  /* 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 (struct s390_unwind_cache *) *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
-    {
-      /* 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);
-    }
-  CATCH (ex, RETURN_MASK_ERROR)
-    {
-      if (ex.error != NOT_AVAILABLE_ERROR)
-	throw_exception (ex);
-    }
-  END_CATCH
-
-  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)
-    {
-      if (info->func != -1)
-	*this_id = frame_id_build_unavailable_stack (info->func);
-      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 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 (struct s390_stub_unwind_cache *) *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
-};
-
+      return NULL;
+    }
+}
 
 /* Signal trampoline stack frames.  */
 
@@ -2878,767 +764,118 @@ s390_canonicalize_syscall (int syscall, enum s390_abi_kind abi)
         return gdb_sys_fstatat64;
       return gdb_sys_newfstatat;
     /* 313+ not yet supported */
-    default:
-      {
-	int ret;
-
-	/* Most "old" syscalls copied from i386.  */
-	if (syscall <= 221)
-	  ret = syscall;
-	/* xattr syscalls.  */
-	else if (syscall >= 224 && syscall <= 235)
-	  ret = syscall + 2;
-	/* timer syscalls.  */
-	else if (syscall >= 254 && syscall <= 262)
-	  ret = syscall + 5;
-	/* mq_* and kexec_load */
-	else if (syscall >= 271 && syscall <= 277)
-	  ret = syscall + 6;
-	/* ioprio_set .. epoll_pwait */
-	else if (syscall >= 282 && syscall <= 312)
-	  ret = syscall + 7;
-	else
-	  ret = gdb_sys_no_syscall;
-
-	return (enum gdb_syscall) ret;
-      }
-    }
-}
-
-static int
-s390_linux_syscall_record (struct regcache *regcache, LONGEST syscall_native)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  int ret;
-  enum gdb_syscall syscall_gdb;
-
-  /* On s390, syscall number can be passed either as immediate field of svc
-     instruction, or in %r1 (with svc 0).  */
-  if (syscall_native == 0)
-    regcache_raw_read_signed (regcache, S390_R1_REGNUM, &syscall_native);
-
-  syscall_gdb = s390_canonicalize_syscall (syscall_native, tdep->abi);
-
-  if (syscall_gdb < 0)
-    {
-      printf_unfiltered (_("Process record and replay target doesn't "
-                           "support syscall number %s\n"),
-                         plongest (syscall_native));
-      return -1;
-    }
-
-  if (syscall_gdb == gdb_sys_sigreturn
-      || syscall_gdb == gdb_sys_rt_sigreturn)
-    {
-      if (s390_all_but_pc_registers_record (regcache))
-        return -1;
-      return 0;
-    }
-
-  if (tdep->abi == ABI_LINUX_ZSERIES)
-    ret = record_linux_system_call (syscall_gdb, regcache,
-                                    &s390x_linux_record_tdep);
-  else
-    ret = record_linux_system_call (syscall_gdb, regcache,
-                                    &s390_linux_record_tdep);
-
-  if (ret)
-    return ret;
-
-  /* Record the return value of the system call.  */
-  if (record_full_arch_list_add_reg (regcache, S390_R2_REGNUM))
-    return -1;
-
-  return 0;
-}
-
-static int
-s390_linux_record_signal (struct gdbarch *gdbarch, struct regcache *regcache,
-                          enum gdb_signal signal)
-{
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-  /* There are two kinds of signal frames on s390. rt_sigframe is always
-     the larger one, so don't even bother with sigframe.  */
-  const int sizeof_rt_sigframe = (tdep->abi == ABI_LINUX_ZSERIES ?
-                                  160 + 8 + 128 + 1024 : 96 + 8 + 128 + 1000);
-  ULONGEST sp;
-  int i;
-
-  for (i = 0; i < 16; i++)
-    {
-      if (record_full_arch_list_add_reg (regcache, S390_R0_REGNUM + i))
-        return -1;
-      if (tdep->gpr_full_regnum != -1)
-        if (record_full_arch_list_add_reg (regcache, S390_R0_UPPER_REGNUM + i))
-          return -1;
-    }
-  if (record_full_arch_list_add_reg (regcache, S390_PSWA_REGNUM))
-    return -1;
-  if (record_full_arch_list_add_reg (regcache, S390_PSWM_REGNUM))
-    return -1;
-
-  /* Record the change in the stack.
-     frame-size = sizeof (struct rt_sigframe) + SIGNAL_FRAMESIZE  */
-  regcache_raw_read_unsigned (regcache, S390_SP_REGNUM, &sp);
-  sp -= sizeof_rt_sigframe;
-
-  if (record_full_arch_list_add_mem (sp, sizeof_rt_sigframe))
-    return -1;
-
-  if (record_full_arch_list_add_end ())
-    return -1;
-
-  return 0;
-}
-
-/* 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)
-{
-  /* 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.  */
-
-/* Unwrap any single-field structs in TYPE and return the effective
-   "inner" type.  E.g., yield "float" for all these cases:
-
-     float x;
-     struct { float x };
-     struct { struct { float x; } x; };
-     struct { struct { struct { float x; } x; } x; };
-
-   However, if an inner type is smaller than MIN_SIZE, abort the
-   unwrapping.  */
-
-static struct type *
-s390_effective_inner_type (struct type *type, unsigned int min_size)
-{
-  while (TYPE_CODE (type) == TYPE_CODE_STRUCT
-	 && TYPE_NFIELDS (type) == 1)
-    {
-      struct type *inner = check_typedef (TYPE_FIELD_TYPE (type, 0));
-
-      if (TYPE_LENGTH (inner) < min_size)
-	break;
-      type = inner;
-    }
-
-  return type;
-}
-
-/* Return non-zero if TYPE should be passed like "float" or
-   "double".  */
-
-static int
-s390_function_arg_float (struct type *type)
-{
-  /* Note that long double as well as complex types are intentionally
-     excluded. */
-  if (TYPE_LENGTH (type) > 8)
-    return 0;
-
-  /* A struct containing just a float or double is passed like a float
-     or double.  */
-  type = s390_effective_inner_type (type, 0);
-
-  return (TYPE_CODE (type) == TYPE_CODE_FLT
-	  || TYPE_CODE (type) == TYPE_CODE_DECFLOAT);
-}
-
-/* Return non-zero if TYPE should be passed like a vector.  */
-
-static int
-s390_function_arg_vector (struct type *type)
-{
-  if (TYPE_LENGTH (type) > 16)
-    return 0;
-
-  /* Structs containing just a vector are passed like a vector.  */
-  type = s390_effective_inner_type (type, TYPE_LENGTH (type));
-
-  return TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type);
-}
-
-/* Determine whether N is a power of two.  */
-
-static int
-is_power_of_two (unsigned int n)
-{
-  return n && ((n & (n - 1)) == 0);
-}
-
-/* For an argument whose type is TYPE and which is not passed like a
-   float or vector, return non-zero if it should be passed like "int"
-   or "long long".  */
-
-static int
-s390_function_arg_integer (struct type *type)
-{
-  enum type_code code = TYPE_CODE (type);
-
-  if (TYPE_LENGTH (type) > 8)
-    return 0;
-
-  if (code == TYPE_CODE_INT
-      || code == TYPE_CODE_ENUM
-      || code == TYPE_CODE_RANGE
-      || code == TYPE_CODE_CHAR
-      || code == TYPE_CODE_BOOL
-      || code == TYPE_CODE_PTR
-      || TYPE_IS_REFERENCE (type))
-    return 1;
-
-  return ((code == TYPE_CODE_UNION || code == TYPE_CODE_STRUCT)
-	  && is_power_of_two (TYPE_LENGTH (type)));
-}
-
-/* Argument passing state: Internal data structure passed to helper
-   routines of s390_push_dummy_call.  */
-
-struct s390_arg_state
-  {
-    /* Register cache, or NULL, if we are in "preparation mode".  */
-    struct regcache *regcache;
-    /* Next available general/floating-point/vector register for
-       argument passing.  */
-    int gr, fr, vr;
-    /* Current pointer to copy area (grows downwards).  */
-    CORE_ADDR copy;
-    /* Current pointer to parameter area (grows upwards).  */
-    CORE_ADDR argp;
-  };
-
-/* Prepare one argument ARG for a dummy call and update the argument
-   passing state AS accordingly.  If the regcache field in AS is set,
-   operate in "write mode" and write ARG into the inferior.  Otherwise
-   run "preparation mode" and skip all updates to the inferior.  */
-
-static void
-s390_handle_arg (struct s390_arg_state *as, struct value *arg,
-		 struct gdbarch_tdep *tdep, int word_size,
-		 enum bfd_endian byte_order, int is_unnamed)
-{
-  struct type *type = check_typedef (value_type (arg));
-  unsigned int length = TYPE_LENGTH (type);
-  int write_mode = as->regcache != NULL;
-
-  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 (as->fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
-	{
-	  /* When we store a single-precision value in an FP register,
-	     it occupies the leftmost bits.  */
-	  if (write_mode)
-	    regcache_cooked_write_part (as->regcache,
-					S390_F0_REGNUM + as->fr,
-					0, length,
-					value_contents (arg));
-	  as->fr += 2;
-	}
-      else
-	{
-	  /* When we store a single-precision value in a stack slot,
-	     it occupies the rightmost bits.  */
-	  as->argp = align_up (as->argp + length, word_size);
-	  if (write_mode)
-	    write_memory (as->argp - length, value_contents (arg),
-			  length);
-	}
-    }
-  else if (tdep->vector_abi == S390_VECTOR_ABI_128
-	   && s390_function_arg_vector (type))
-    {
-      static const char use_vr[] = {24, 26, 28, 30, 25, 27, 29, 31};
-
-      if (!is_unnamed && as->vr < ARRAY_SIZE (use_vr))
-	{
-	  int regnum = S390_V24_REGNUM + use_vr[as->vr] - 24;
-
-	  if (write_mode)
-	    regcache_cooked_write_part (as->regcache, regnum,
-					0, length,
-					value_contents (arg));
-	  as->vr++;
-	}
-      else
-	{
-	  if (write_mode)
-	    write_memory (as->argp, value_contents (arg), length);
-	  as->argp = align_up (as->argp + length, word_size);
-	}
-    }
-  else if (s390_function_arg_integer (type) && length <= word_size)
-    {
-      /* Initialize it just to avoid a GCC false warning.  */
-      ULONGEST val = 0;
-
-      if (write_mode)
-	{
-	  /* Place value in least significant bits of the register or
-	     memory word and sign- or zero-extend to full word size.
-	     This also applies to a struct or union.  */
-	  val = TYPE_UNSIGNED (type)
-	    ? extract_unsigned_integer (value_contents (arg),
-					length, byte_order)
-	    : extract_signed_integer (value_contents (arg),
-				      length, byte_order);
-	}
-
-      if (as->gr <= 6)
-	{
-	  if (write_mode)
-	    regcache_cooked_write_unsigned (as->regcache,
-					    S390_R0_REGNUM + as->gr,
-					    val);
-	  as->gr++;
-	}
-      else
-	{
-	  if (write_mode)
-	    write_memory_unsigned_integer (as->argp, word_size,
-					   byte_order, val);
-	  as->argp += word_size;
-	}
-    }
-  else if (s390_function_arg_integer (type) && length == 8)
-    {
-      if (as->gr <= 5)
-	{
-	  if (write_mode)
-	    {
-	      regcache_cooked_write (as->regcach[...]

[diff truncated at 100000 bytes]


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