[commit] Floating-point register support for PA-RISC BSD's

[Mark Kettenis <mark dot kettenis at xs4all dot nl>]

Seems to work on OpenBSD/hppa and should work on NetBSD/hp700 if there
are not too many kernel bugs.

Unfortunately I messed up the commit a bit so the log messages for
these files are a bit wierd.  Sorry.

Index: ChangeLog
from  Mark Kettenis  <kettenis@gnu.org>

	* hppa-tdep.h (enum hppa_regnum): Add HPPA_FP31R_REGNUM.
	* hppabsd-nat.c (hppabsd_fpregset_supplies_p)
	(hppabsd_supply_fpregset, hppabsd_collect_fpregset): New
	functions.
	(hppabsd_fetch_registers, hppabsd_store_registers): Handle
	floating-point registers.

Index: hppa-tdep.h
===================================================================
RCS file: /cvs/src/src/gdb/hppa-tdep.h,v
retrieving revision 1.23
diff -u -p -r1.23 hppa-tdep.h
--- hppa-tdep.h 17 Dec 2005 22:34:01 -0000 1.23
+++ hppa-tdep.h 14 Jan 2006 12:21:06 -0000
@@ -68,6 +68,7 @@ enum hppa_regnum
   HPPA_FP0_REGNUM = 64,		/* First floating-point.  */
   HPPA_FP4_REGNUM = 72,
   HPPA64_FP4_REGNUM = 68,
+  HPPA_FP31R_REGNUM = 127,	/* Last floating-point.  */
 
   HPPA_ARG0_REGNUM = 26,	/* The first argument of a callee. */
   HPPA_ARG1_REGNUM = 25,	/* The second argument of a callee. */
Index: hppabsd-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/hppabsd-nat.c,v
retrieving revision 1.5
diff -u -p -r1.5 hppabsd-nat.c
--- hppabsd-nat.c 17 Dec 2005 22:34:01 -0000 1.5
+++ hppabsd-nat.c 14 Jan 2006 12:21:06 -0000
@@ -37,6 +37,12 @@ hppabsd_gregset_supplies_p (int regnum)
   return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_PCOQ_TAIL_REGNUM);
 }
 
+static int
+hppabsd_fpregset_supplies_p (int regnum)
+{
+  return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
+}
+
 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
 
 static void
@@ -53,6 +59,22 @@ hppabsd_supply_gregset (struct regcache 
   regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
 }
 
+/* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
+
+static void
+hppabsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
+{
+  const char *regs = fpregs;
+  int regnum;
+
+  for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
+       regnum += 2, regs += 8)
+    {
+      regcache_raw_supply (regcache, regnum, regs);
+      regcache_raw_supply (regcache, regnum + 1, regs + 4);
+    }
+}
+
 /* Collect the general-purpose registers from REGCACHE and store them
    in GREGS.  */
 
@@ -76,6 +98,26 @@ hppabsd_collect_gregset (const struct re
   if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
     regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
 }
+
+/* Collect the floating-point registers from REGCACHE and store them
+   in FPREGS.  */
+
+static void
+hppabsd_collect_fpregset (struct regcache *regcache,
+			  void *fpregs, int regnum)
+{
+  char *regs = fpregs;
+  int i;
+
+  for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
+    {
+      if (regnum == -1 || regnum == i || regnum == i + 1)
+	{
+	  regcache_raw_collect (regcache, i, regs);
+	  regcache_raw_collect (regcache, i + 1, regs + 4);
+	}
+    }
+}
 
 
 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
@@ -96,6 +138,17 @@ hppabsd_fetch_registers (int regnum)
 
       hppabsd_supply_gregset (regcache, &regs);
     }
+
+  if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
+    {
+      struct fpreg fpregs;
+
+      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't get floating point status"));
+
+      hppabsd_supply_fpregset (current_regcache, &fpregs);
+    }
 }
 
 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
@@ -118,6 +171,21 @@ hppabsd_store_registers (int regnum)
 	          (PTRACE_TYPE_ARG3) &regs, 0) == -1)
         perror_with_name (_("Couldn't write registers"));
     }
+
+  if (regnum == -1 || hppabsd_fpregset_supplies_p (regnum))
+    {
+      struct fpreg fpregs;
+
+      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't get floating point status"));
+
+      hppabsd_collect_fpregset (current_regcache, &fpregs, regnum);
+
+      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
+		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't write floating point status"));
+    }
 }
 
 /* Provide a prototype to silence -Wmissing-prototypes.  */