Add minimal support for OpenBSD/powerpc64.

7 files changed, 748 insertions, 0 deletions

diff --git a/gnu/usr.bin/binutils/gdb/config/powerpc/obsd64.mh b/gnu/usr.bin/binutils/gdb/config/powerpc/obsd64.mh
new file mode 100644
index 00000000000..fc6101fd081
--- /dev/null
+++ b/gnu/usr.bin/binutils/gdb/config/powerpc/obsd64.mh
@@ -0,0 +1,4 @@
+# Host: OpenBSD/powerpc
+NATDEPFILES= fork-child.o inf-ptrace.o obsd-nat.o ppc64obsd-nat.o bsd-kvm.o
+
+LOADLIBES= -lkvm
diff --git a/gnu/usr.bin/binutils/gdb/config/powerpc/obsd64.mt b/gnu/usr.bin/binutils/gdb/config/powerpc/obsd64.mt
new file mode 100644
index 00000000000..8728459d0a2
--- /dev/null
+++ b/gnu/usr.bin/binutils/gdb/config/powerpc/obsd64.mt
@@ -0,0 +1,4 @@
+# Target: OpenBSD/powerpc64
+TDEPFILES= rs6000-tdep.o ppc-sysv-tdep.o ppc64obsd-tdep.o \
+	corelow.o solib.o solib-svr4.o
+DEPRECATED_TM_FILE= tm-ppc-eabi.h
diff --git a/gnu/usr.bin/binutils/gdb/configure.host b/gnu/usr.bin/binutils/gdb/configure.host
index 5de3c973b23..e6f89454e85 100644
--- a/gnu/usr.bin/binutils/gdb/configure.host
+++ b/gnu/usr.bin/binutils/gdb/configure.host
@@ -113,6 +113,7 @@ powerpc-*-linux*)	gdb_host=linux ;;
 powerpc-*-netbsd* | powerpc-*-knetbsd*-gnu)
 			gdb_host=nbsd ;;
 powerpc-*-openbsd*)	gdb_host=obsd ;;
+powerpc64-*-openbsd*)	gdb_host=obsd64 ;;
 
 powerpc64-*-linux*)     gdb_host=ppc64-linux ;;
 
diff --git a/gnu/usr.bin/binutils/gdb/configure.tgt b/gnu/usr.bin/binutils/gdb/configure.tgt
index 788727843d9..7f4ab89806e 100644
--- a/gnu/usr.bin/binutils/gdb/configure.tgt
+++ b/gnu/usr.bin/binutils/gdb/configure.tgt
@@ -151,6 +151,7 @@ ns32k-*-netbsd*)	gdb_target=nbsdaout ;;
 powerpc-*-netbsd* | powerpc-*-knetbsd*-gnu)
 			gdb_target=nbsd ;;
 powerpc-*-openbsd*)	gdb_target=obsd ;;
+powerpc64-*-openbsd*)	gdb_target=obsd64 ;;
 powerpc-*-aix*)		gdb_target=aix ;;
 powerpc-*-linux*)	gdb_target=linux
 			build_gdbserver=yes
diff --git a/gnu/usr.bin/binutils/gdb/ppc64obsd-nat.c b/gnu/usr.bin/binutils/gdb/ppc64obsd-nat.c
new file mode 100644
index 00000000000..080c02829b0
--- /dev/null
+++ b/gnu/usr.bin/binutils/gdb/ppc64obsd-nat.c
@@ -0,0 +1,242 @@
+/* Native-dependent code for OpenBSD/powerpc.
+
+   Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "inferior.h"
+#include "regcache.h"
+
+#include "gdb_assert.h"
+#include <stddef.h>
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <sys/signal.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
+#include <machine/reg.h>
+
+#include "obsd-nat.h"
+#include "ppc-tdep.h"
+#include "ppc64obsd-tdep.h"
+#include "inf-ptrace.h"
+#include "bsd-kvm.h"
+
+/* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
+   4.0.  On older releases the floating-point registers are handled by
+   PT_GETREGS/PT_SETREGS, but fpscr wasn't available..  */
+
+#ifdef PT_GETFPREGS
+
+/* Returns true if PT_GETFPREGS fetches this register.  */
+
+static int
+getfpregs_supplies (int regnum)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+  /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
+     point registers.  Traditionally, GDB's register set has still
+     listed the floating point registers for such machines, so this
+     code is harmless.  However, the new E500 port actually omits the
+     floating point registers entirely from the register set --- they
+     don't even have register numbers assigned to them.
+
+     It's not clear to me how best to update this code, so this assert
+     will alert the first person to encounter the NetBSD/E500
+     combination to the problem.  */
+  gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
+
+  return ((regnum >= tdep->ppc_fp0_regnum
+           && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
+	  || regnum == tdep->ppc_fpscr_regnum);
+}
+
+#endif /* PT_GETFPREGS */
+
+/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
+   for all registers.  */
+
+static void
+ppc64obsd_fetch_registers (int regnum)
+{
+  struct reg regs;
+  int pid;
+
+  /* Cater for systems like OpenBSD, that implement threads as
+     separate processes.  */
+  pid = ptid_get_lwp (inferior_ptid);
+  if (pid == 0)
+    pid = ptid_get_pid (inferior_ptid);
+
+  if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+    perror_with_name (_("Couldn't get registers"));
+
+  ppc_supply_gregset (&ppc64obsd_gregset, current_regcache, -1,
+		      &regs, sizeof regs);
+#ifndef PT_GETFPREGS
+  ppc_supply_fpregset (&ppc64obsd_gregset, current_regcache, -1,
+		       &regs, sizeof regs);
+#endif
+
+#ifdef PT_GETFPREGS
+  if (regnum == -1 || getfpregs_supplies (regnum))
+    {
+      struct fpreg fpregs;
+
+      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't get floating point status"));
+
+      ppc_supply_fpregset (&ppc64obsd_fpregset, current_regcache, -1,
+			   &fpregs, sizeof fpregs);
+    }
+#endif
+}
+
+/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
+   this for all registers.  */
+
+static void
+ppc64obsd_store_registers (int regnum)
+{
+  struct reg regs;
+  int pid;
+
+  /* Cater for systems like OpenBSD, that implement threads as
+     separate processes.  */
+  pid = ptid_get_lwp (inferior_ptid);
+  if (pid == 0)
+    pid = ptid_get_pid (inferior_ptid);
+
+  if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+    perror_with_name (_("Couldn't get registers"));
+
+  ppc_collect_gregset (&ppc64obsd_gregset, current_regcache,
+		       regnum, &regs, sizeof regs);
+#ifndef PT_GETFPREGS
+  ppc_collect_fpregset (&ppc64obsd_gregset, current_regcache,
+			regnum, &regs, sizeof regs);
+#endif
+
+  if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+    perror_with_name (_("Couldn't write registers"));
+
+#ifdef PT_GETFPREGS
+  if (regnum == -1 || getfpregs_supplies (regnum))
+    {
+      struct fpreg fpregs;
+
+      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't get floating point status"));
+
+      ppc_collect_fpregset (&ppc64obsd_fpregset, current_regcache,
+			    regnum, &fpregs, sizeof fpregs);
+
+      if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't write floating point status"));
+    }
+#endif
+}
+
+
+static int
+ppc64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+#if 0
+  struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+  struct switchframe sf;
+  struct callframe cf;
+  int i, regnum;
+
+  /* The following is true for OpenBSD 3.7:
+
+     The pcb contains %r1 (the stack pointer) at the point of the
+     context switch in cpu_switch().  At that point we have a stack
+     frame as described by `struct switchframe', and below that a call
+     frame as described by `struct callframe'.  From this information
+     we reconstruct the register state as it would look when we are in
+     cpu_switch().  */
+
+  /* The stack pointer shouldn't be zero.  */
+  if (pcb->pcb_sp == 0)
+    return 0;
+
+  read_memory (pcb->pcb_sp, (char *)&sf, sizeof sf);
+  regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
+  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
+  for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++)
+    regcache_raw_supply (regcache, regnum, &sf.fixreg[i]);
+
+  read_memory (sf.sp, (char *)&cf, sizeof cf);
+  regcache_raw_supply (regcache, SP_REGNUM, &cf.sp);
+  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
+  regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
+
+  read_memory (cf.sp, (char *)&cf, sizeof cf);
+  regcache_raw_supply (regcache, PC_REGNUM, &cf.lr);
+#endif
+
+  return 1;
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_ppc64obsd_nat (void);
+
+void
+_initialize_ppc64obsd_nat (void)
+{
+  struct target_ops *t;
+
+  /* Add in local overrides.  */
+  t = inf_ptrace_target ();
+  t->to_fetch_registers = ppc64obsd_fetch_registers;
+  t->to_store_registers = ppc64obsd_store_registers;
+  t->to_pid_to_str = obsd_pid_to_str;
+  t->to_find_new_threads = obsd_find_new_threads;
+  t->to_wait = obsd_wait;
+  add_target (t);
+
+  /* General-purpose registers.  */
+  ppc64obsd_reg_offsets.r0_offset = offsetof (struct reg, r_reg);
+  ppc64obsd_reg_offsets.pc_offset = offsetof (struct reg, r_pc);
+  ppc64obsd_reg_offsets.ps_offset = offsetof (struct reg, r_msr);
+  ppc64obsd_reg_offsets.cr_offset = offsetof (struct reg, r_cr);
+  ppc64obsd_reg_offsets.lr_offset = offsetof (struct reg, r_lr);
+  ppc64obsd_reg_offsets.ctr_offset = offsetof (struct reg, r_ctr);
+  ppc64obsd_reg_offsets.xer_offset = offsetof (struct reg, r_xer);
+  ppc64obsd_reg_offsets.mq_offset = -1;
+
+  /* Floating-point registers.  */
+  ppc64obsd_reg_offsets.f0_offset = -1;
+  ppc64obsd_reg_offsets.fpscr_offset = -1;
+#ifdef PT_GETFPREGS
+  ppc64obsd_fpreg_offsets.f0_offset = -1;
+  ppc64obsd_fpreg_offsets.fpscr_offset = -1;
+#endif
+
+  /* AltiVec registers.  */
+  ppc64obsd_reg_offsets.vr0_offset = -1;
+  ppc64obsd_reg_offsets.vscr_offset = -1;
+  ppc64obsd_reg_offsets.vrsave_offset = -1;
+
+  /* Support debugging kernel virtual memory images.  */
+  bsd_kvm_add_target (ppc64obsd_supply_pcb);
+}
diff --git a/gnu/usr.bin/binutils/gdb/ppc64obsd-tdep.c b/gnu/usr.bin/binutils/gdb/ppc64obsd-tdep.c
new file mode 100644
index 00000000000..12ba9b9247d
--- /dev/null
+++ b/gnu/usr.bin/binutils/gdb/ppc64obsd-tdep.c
@@ -0,0 +1,440 @@
+/* Target-dependent code for OpenBSD/powerpc64.
+
+   Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#include "defs.h"
+#include "arch-utils.h"
+#include "floatformat.h"
+#include "frame.h"
+#include "frame-unwind.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
+#include "symtab.h"
+#include "trad-frame.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "ppc-tdep.h"
+#include "ppc64obsd-tdep.h"
+#include "solib-svr4.h"
+
+/* Register offsets from <machine/reg.h>.  */
+struct ppc_reg_offsets ppc64obsd_reg_offsets;
+struct ppc_reg_offsets ppc64obsd_fpreg_offsets;
+
+
+/* Register set support functions.  */
+
+static void
+ppc64_supply_reg (struct regcache *regcache, int regnum, 
+		  const char *regs, size_t offset)
+{
+  if (regnum != -1 && offset != -1)
+    regcache_raw_supply (regcache, regnum, regs + offset);
+}
+
+static void
+ppc64_collect_reg (const struct regcache *regcache, int regnum,
+		   char *regs, size_t offset)
+{
+  if (regnum != -1 && offset != -1)
+    regcache_raw_collect (regcache, regnum, regs + offset);
+}
+    
+/* Supply register REGNUM in the general-purpose register set REGSET
+   from the buffer specified by GREGS and LEN to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+void
+ppc64_supply_gregset (const struct regset *regset, struct regcache *regcache,
+		      int regnum, const void *gregs, size_t len)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  const struct ppc_reg_offsets *offsets = regset->descr;
+  size_t offset;
+  int i;
+
+  for (i = tdep->ppc_gp0_regnum, offset = offsets->r0_offset;
+       i < tdep->ppc_gp0_regnum + ppc_num_gprs;
+       i++, offset += 8)
+    {
+      if (regnum == -1 || regnum == i)
+	ppc64_supply_reg (regcache, i, gregs, offset);
+    }
+
+  if (regnum == -1 || regnum == PC_REGNUM)
+    ppc64_supply_reg (regcache, PC_REGNUM, gregs, offsets->pc_offset);
+  if (regnum == -1 || regnum == tdep->ppc_ps_regnum)
+    ppc64_supply_reg (regcache, tdep->ppc_ps_regnum,
+		      gregs, offsets->ps_offset);
+  if (regnum == -1 || regnum == tdep->ppc_cr_regnum)
+    ppc64_supply_reg (regcache, tdep->ppc_cr_regnum,
+		      gregs, offsets->cr_offset);
+  if (regnum == -1 || regnum == tdep->ppc_lr_regnum)
+    ppc64_supply_reg (regcache, tdep->ppc_lr_regnum,
+		      gregs, offsets->lr_offset);
+  if (regnum == -1 || regnum == tdep->ppc_ctr_regnum)
+    ppc64_supply_reg (regcache, tdep->ppc_ctr_regnum,
+		      gregs, offsets->ctr_offset);
+  if (regnum == -1 || regnum == tdep->ppc_xer_regnum)
+    ppc64_supply_reg (regcache, tdep->ppc_xer_regnum,
+		      gregs, offsets->cr_offset);
+}
+
+/* Collect register REGNUM in the general-purpose register set
+   REGSET. from register cache REGCACHE into the buffer specified by
+   GREGS and LEN.  If REGNUM is -1, do this for all registers in
+   REGSET.  */
+
+void
+ppc64_collect_gregset (const struct regset *regset,
+		       const struct regcache *regcache,
+		       int regnum, void *gregs, size_t len)
+{
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  const struct ppc_reg_offsets *offsets = regset->descr;
+  size_t offset;
+  int i;
+
+  offset = offsets->r0_offset;
+  for (i = tdep->ppc_gp0_regnum;
+       i < tdep->ppc_gp0_regnum + ppc_num_gprs;
+       i++, offset += 8)
+    {
+      if (regnum == -1 || regnum == i)
+	ppc64_collect_reg (regcache, i, gregs, offset);
+    }
+
+  if (regnum == -1 || regnum == PC_REGNUM)
+    ppc64_collect_reg (regcache, PC_REGNUM, gregs, offsets->pc_offset);
+  if (regnum == -1 || regnum == tdep->ppc_ps_regnum)
+    ppc64_collect_reg (regcache, tdep->ppc_ps_regnum,
+		       gregs, offsets->ps_offset);
+  if (regnum == -1 || regnum == tdep->ppc_cr_regnum)
+    ppc64_collect_reg (regcache, tdep->ppc_cr_regnum,
+		       gregs, offsets->cr_offset);
+  if (regnum == -1 || regnum == tdep->ppc_lr_regnum)
+    ppc64_collect_reg (regcache, tdep->ppc_lr_regnum,
+		       gregs, offsets->lr_offset);
+  if (regnum == -1 || regnum == tdep->ppc_ctr_regnum)
+    ppc64_collect_reg (regcache, tdep->ppc_ctr_regnum,
+		       gregs, offsets->ctr_offset);
+  if (regnum == -1 || regnum == tdep->ppc_xer_regnum)
+    ppc64_collect_reg (regcache, tdep->ppc_xer_regnum,
+		       gregs, offsets->xer_offset);
+}
+
+/* Core file support.  */
+
+/* Supply register REGNUM in the general-purpose register set REGSET
+   from the buffer specified by GREGS and LEN to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+void
+ppc64obsd_supply_gregset (const struct regset *regset,
+			  struct regcache *regcache, int regnum,
+			  const void *gregs, size_t len)
+{
+  ppc64_supply_gregset (regset, regcache, regnum, gregs, len);
+}
+
+/* Collect register REGNUM in the general-purpose register set
+   REGSET. from register cache REGCACHE into the buffer specified by
+   GREGS and LEN.  If REGNUM is -1, do this for all registers in
+   REGSET.  */
+
+void
+ppc64obsd_collect_gregset (const struct regset *regset,
+			   const struct regcache *regcache, int regnum,
+			   void *gregs, size_t len)
+{
+  ppc64_collect_gregset (regset, regcache, regnum, gregs, len);
+}
+
+/* OpenBSD/powerpc register set.  */
+
+struct regset ppc64obsd_gregset =
+{
+  &ppc64obsd_reg_offsets,
+  ppc64obsd_supply_gregset
+};
+
+struct regset ppc64obsd_fpregset =
+{
+  &ppc64obsd_fpreg_offsets,
+  ppc_supply_fpregset
+};
+
+/* Return the appropriate register set for the core section identified
+   by SECT_NAME and SECT_SIZE.  */
+
+static const struct regset *
+ppc64obsd_regset_from_core_section (struct gdbarch *gdbarch,
+				  const char *sect_name, size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0 && sect_size >= 304)
+    return &ppc64obsd_gregset;
+
+  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 1048)
+    return &ppc64obsd_fpregset;
+
+  return NULL;
+}
+
+
+/* Signal trampolines.  */
+
+/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
+   in virtual memory.  The randomness makes it somewhat tricky to
+   detect it, but fortunately we can rely on the fact that the start
+   of the sigtramp routine is page-aligned.  We recognize the
+   trampoline by looking for the code that invokes the sigreturn
+   system call.  The offset where we can find that code varies from
+   release to release.
+
+   By the way, the mapping mentioned above is read-only, so you cannot
+   place a breakpoint in the signal trampoline.  */
+
+/* Default page size.  */
+static const int ppc64obsd_page_size = 4096;
+
+/* Offset for sigreturn(2).  */
+static const int ppc64obsd_sigreturn_offset[] = {
+  0x98,				/* OpenBSD 3.8 */
+  0x0c,				/* OpenBSD 3.2 */
+  -1
+};
+
+static int
+ppc64obsd_sigtramp_p (struct frame_info *next_frame)
+{
+  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR start_pc = (pc & ~(ppc64obsd_page_size - 1));
+  const int *offset;
+  char *name;
+
+  find_pc_partial_function (pc, &name, NULL, NULL);
+  if (name)
+    return 0;
+
+  for (offset = ppc64obsd_sigreturn_offset; *offset != -1; offset++)
+    {
+      char buf[2 * PPC_INSN_SIZE];
+      unsigned long insn;
+
+      if (!safe_frame_unwind_memory (next_frame, start_pc + *offset,
+				     buf, sizeof buf))
+	continue;
+
+      /* Check for "li r0,SYS_sigreturn".  */
+      insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
+      if (insn != 0x38000067)
+	continue;
+
+      /* Check for "sc".  */
+      insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, PPC_INSN_SIZE);
+      if (insn != 0x44000002)
+	continue;
+
+      return 1;
+    }
+
+  return 0;
+}
+
+static struct trad_frame_cache *
+ppc64obsd_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+  struct gdbarch *gdbarch = get_frame_arch (next_frame);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  struct trad_frame_cache *cache;
+  CORE_ADDR addr, base, func;
+  char buf[PPC_INSN_SIZE];
+  unsigned long insn, sigcontext_offset;
+  int i;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = trad_frame_cache_zalloc (next_frame);
+  *this_cache = cache;
+
+  func = frame_pc_unwind (next_frame);
+  func &= ~(ppc64obsd_page_size - 1);
+  if (!safe_frame_unwind_memory (next_frame, func, buf, sizeof buf))
+    return cache;
+
+  /* Calculate the offset where we can find `struct sigcontext'.  We
+     base our calculation on the amount of stack space reserved by the
+     first instruction of the signal trampoline.  */
+  insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
+  sigcontext_offset = (0x10000 - (insn & 0x0000ffff)) + 8;
+
+  base = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
+  addr = base + sigcontext_offset + 2 * tdep->wordsize;
+  for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
+    {
+      int regnum = i + tdep->ppc_gp0_regnum;
+      trad_frame_set_reg_addr (cache, regnum, addr);
+    }
+  trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
+  addr += tdep->wordsize;
+  trad_frame_set_reg_addr (cache, PC_REGNUM, addr); /* SRR0? */
+  addr += tdep->wordsize;
+
+  /* Construct the frame ID using the function start.  */
+  trad_frame_set_id (cache, frame_id_build (base, func));
+
+  return cache;
+}
+
+static void
+ppc64obsd_sigtramp_frame_this_id (struct frame_info *next_frame,
+				void **this_cache, struct frame_id *this_id)
+{
+  struct trad_frame_cache *cache =
+    ppc64obsd_sigtramp_frame_cache (next_frame, this_cache);
+
+  trad_frame_get_id (cache, this_id);
+}
+
+static void
+ppc64obsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
+				      void **this_cache, int regnum,
+				      int *optimizedp, enum lval_type *lvalp,
+				      CORE_ADDR *addrp, int *realnump,
+				      char *valuep)
+{
+  struct trad_frame_cache *cache =
+    ppc64obsd_sigtramp_frame_cache (next_frame, this_cache);
+
+  trad_frame_get_register (cache, next_frame, regnum,
+			   optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind ppc64obsd_sigtramp_frame_unwind = {
+  SIGTRAMP_FRAME,
+  ppc64obsd_sigtramp_frame_this_id,
+  ppc64obsd_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+ppc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+  if (ppc64obsd_sigtramp_p (next_frame))
+    return &ppc64obsd_sigtramp_frame_unwind;
+
+  return NULL;
+}
+
+
+static void
+ppc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  /* OpenBSD doesn't support the 128-bit `long double' from the psABI.  */
+  set_gdbarch_long_double_bit (gdbarch, 64);
+  set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
+
+  /* OpenBSD currently uses a broken GCC.  */
+  set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
+
+  /* OpenBSD uses SVR4-style shared libraries.  */
+  set_solib_svr4_fetch_link_map_offsets
+    (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+  set_gdbarch_regset_from_core_section
+    (gdbarch, ppc64obsd_regset_from_core_section);
+
+  frame_unwind_append_sniffer (gdbarch, ppc64obsd_sigtramp_frame_sniffer);
+}
+
+
+/* OpenBSD uses uses the traditional NetBSD core file format, even for
+   ports that use ELF.  */
+#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
+
+static enum gdb_osabi
+ppc64obsd_core_osabi_sniffer (bfd *abfd)
+{
+  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+    return GDB_OSABI_NETBSD_CORE;
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_ppc64obsd_tdep (void);
+
+void
+_initialize_ppc64obsd_tdep (void)
+{
+  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
+  gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
+                                  ppc64obsd_core_osabi_sniffer);
+
+#if 0
+  gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
+			  ppc64obsd_init_abi);
+#endif
+  gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64,
+			  GDB_OSABI_OPENBSD_ELF, ppc64obsd_init_abi);
+
+  /* Avoid initializing the register offsets again if they were
+     already initailized by ppc64obsd-nat.c.  */
+  if (ppc64obsd_reg_offsets.pc_offset == 0)
+    {
+      /* General-purpose registers.  */
+      ppc64obsd_reg_offsets.r0_offset = 0;
+      ppc64obsd_reg_offsets.pc_offset = 288;
+      ppc64obsd_reg_offsets.ps_offset = 296;
+      ppc64obsd_reg_offsets.cr_offset = 264;
+      ppc64obsd_reg_offsets.lr_offset = 256;
+      ppc64obsd_reg_offsets.ctr_offset = 280;
+      ppc64obsd_reg_offsets.xer_offset = 272;
+      ppc64obsd_reg_offsets.mq_offset = -1;
+
+      /* Floating-point registers.  */
+      ppc64obsd_reg_offsets.f0_offset = -1;
+      ppc64obsd_reg_offsets.fpscr_offset = -1;
+
+      /* AltiVec registers.  */
+      ppc64obsd_reg_offsets.vr0_offset = -1;
+      ppc64obsd_reg_offsets.vscr_offset = -1;
+      ppc64obsd_reg_offsets.vrsave_offset = -1;
+    }
+
+  if (ppc64obsd_fpreg_offsets.fpscr_offset == 0)
+    {
+      /* Floating-point registers.  */
+      ppc64obsd_reg_offsets.f0_offset = -1;
+      ppc64obsd_reg_offsets.fpscr_offset = -1;
+    }
+}
diff --git a/gnu/usr.bin/binutils/gdb/ppc64obsd-tdep.h b/gnu/usr.bin/binutils/gdb/ppc64obsd-tdep.h
new file mode 100644
index 00000000000..7df2af29238
--- /dev/null
+++ b/gnu/usr.bin/binutils/gdb/ppc64obsd-tdep.h
@@ -0,0 +1,56 @@
+/* Target-dependent code for OpenBSD/powerpc64.
+
+   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#ifndef PPC64OBSD_TDEP_H
+#define PPC64OBSD_TDEP_H
+
+#include <stddef.h>
+
+struct regset;
+struct regcache;
+
+/* Register offsets for OpenBSD/powerpc64.  */
+extern struct ppc_reg_offsets ppc64obsd_reg_offsets;
+extern struct ppc_reg_offsets ppc64obsd_fpreg_offsets;
+
+/* Register sets for OpenBSD/powerpc64.  */
+extern struct regset ppc64obsd_gregset;
+extern struct regset ppc64obsd_fpregset;
+
+
+/* Supply register REGNUM in the general-purpose register set REGSET
+   from the buffer specified by GREGS and LEN to register cache
+   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
+
+extern void ppc64obsd_supply_gregset (const struct regset *regset,
+				      struct regcache *regcache, int regnum,
+				      const void *gregs, size_t len);
+
+/* Collect register REGNUM in the general-purpose register set
+   REGSET. from register cache REGCACHE into the buffer specified by
+   GREGS and LEN.  If REGNUM is -1, do this for all registers in
+   REGSET.  */
+
+extern void ppc64obsd_collect_gregset (const struct regset *regset,
+				       const struct regcache *regcache,
+				       int regnum, void *gregs, size_t len);
+
+#endif /* ppc64obsd-tdep.h */