[thirdparty/binutils-gdb.git] / gdb / ppcobsd-tdep.c

/* Target-dependent code for OpenBSD/powerpc.

   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "frame-unwind.h"
#include "gdbtypes.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 "ppcobsd-tdep.h"
#include "solib-svr4.h"

/* Register offsets from <machine/reg.h>.  */
struct ppc_reg_offsets ppcobsd_reg_offsets;
struct ppc_reg_offsets ppcobsd_fpreg_offsets;
\f

/* 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
ppcobsd_supply_gregset (const struct regset *regset,
			struct regcache *regcache, int regnum,
			const void *gregs, size_t len)
{
  ppc_supply_gregset (regset, regcache, regnum, gregs, len);
  ppc_supply_fpregset (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
ppcobsd_collect_gregset (const struct regset *regset,
			 const struct regcache *regcache, int regnum,
			 void *gregs, size_t len)
{
  ppc_collect_gregset (regset, regcache, regnum, gregs, len);
  ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
}

/* OpenBSD/powerpc register set.  */

struct regset ppcobsd_gregset =
{
  &ppcobsd_reg_offsets,
  ppcobsd_supply_gregset
};

struct regset ppcobsd_fpregset =
{
  &ppcobsd_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 *
ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
				  const char *sect_name, size_t sect_size)
{
  if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
    return &ppcobsd_gregset;

  return NULL;
}
\f

/* 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 ppcobsd_page_size = 4096;

/* Offset for sigreturn(2).  */
static const int ppcobsd_sigreturn_offset[] = {
  0x98,				/* OpenBSD 3.8 */
  0x0c,				/* OpenBSD 3.2 */
  -1
};

static int
ppcobsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
				struct frame_info *this_frame,
				void **this_cache)
{
  CORE_ADDR pc = get_frame_pc (this_frame);
  CORE_ADDR start_pc = (pc & ~(ppcobsd_page_size - 1));
  const int *offset;
  char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);
  if (name)
    return 0;

  for (offset = ppcobsd_sigreturn_offset; *offset != -1; offset++)
    {
      gdb_byte buf[2 * PPC_INSN_SIZE];
      unsigned long insn;

      if (!safe_frame_unwind_memory (this_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 *
ppcobsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  struct trad_frame_cache *cache;
  CORE_ADDR addr, base, func;
  gdb_byte buf[PPC_INSN_SIZE];
  unsigned long insn, sigcontext_offset;
  int i;

  if (*this_cache)
    return *this_cache;

  cache = trad_frame_cache_zalloc (this_frame);
  *this_cache = cache;

  func = get_frame_pc (this_frame);
  func &= ~(ppcobsd_page_size - 1);
  if (!safe_frame_unwind_memory (this_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 = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
  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, gdbarch_pc_regnum (gdbarch), 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
ppcobsd_sigtramp_frame_this_id (struct frame_info *this_frame,
				void **this_cache, struct frame_id *this_id)
{
  struct trad_frame_cache *cache =
    ppcobsd_sigtramp_frame_cache (this_frame, this_cache);

  trad_frame_get_id (cache, this_id);
}

static struct value *
ppcobsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
				      void **this_cache, int regnum)
{
  struct trad_frame_cache *cache =
    ppcobsd_sigtramp_frame_cache (this_frame, this_cache);

  return trad_frame_get_register (cache, this_frame, regnum);
}

static const struct frame_unwind ppcobsd_sigtramp_frame_unwind = {
  SIGTRAMP_FRAME,
  ppcobsd_sigtramp_frame_this_id,
  ppcobsd_sigtramp_frame_prev_register,
  NULL,
  ppcobsd_sigtramp_frame_sniffer
};
\f

static void
ppcobsd_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, floatformats_ieee_double);

  /* 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_ilp32_fetch_link_map_offsets);

  set_gdbarch_regset_from_core_section
    (gdbarch, ppcobsd_regset_from_core_section);

  frame_unwind_append_unwinder (gdbarch, &ppcobsd_sigtramp_frame_unwind);
}
\f

/* 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
ppcobsd_core_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
    return GDB_OSABI_NETBSD_CORE;

  return GDB_OSABI_UNKNOWN;
}
\f

/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_ppcobsd_tdep (void);

void
_initialize_ppcobsd_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,
                                  ppcobsd_core_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
			  ppcobsd_init_abi);
  gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
			  ppcobsd_init_abi);

  /* Avoid initializing the register offsets again if they were
     already initailized by ppcobsd-nat.c.  */
  if (ppcobsd_reg_offsets.pc_offset == 0)
    {
      /* General-purpose registers.  */
      ppcobsd_reg_offsets.r0_offset = 0;
      ppcobsd_reg_offsets.gpr_size = 4;
      ppcobsd_reg_offsets.xr_size = 4;
      ppcobsd_reg_offsets.pc_offset = 384;
      ppcobsd_reg_offsets.ps_offset = 388;
      ppcobsd_reg_offsets.cr_offset = 392;
      ppcobsd_reg_offsets.lr_offset = 396;
      ppcobsd_reg_offsets.ctr_offset = 400;
      ppcobsd_reg_offsets.xer_offset = 404;
      ppcobsd_reg_offsets.mq_offset = 408;

      /* Floating-point registers.  */
      ppcobsd_reg_offsets.f0_offset = 128;
      ppcobsd_reg_offsets.fpscr_offset = -1;

      /* AltiVec registers.  */
      ppcobsd_reg_offsets.vr0_offset = 0;
      ppcobsd_reg_offsets.vscr_offset = 512;
      ppcobsd_reg_offsets.vrsave_offset = 520;
    }

  if (ppcobsd_fpreg_offsets.fpscr_offset == 0)
    {
      /* Floating-point registers.  */
      ppcobsd_reg_offsets.f0_offset = 0;
      ppcobsd_reg_offsets.fpscr_offset = 256;
      ppcobsd_reg_offsets.fpscr_size = 4;
    }
}
Commit	Line	Data
d195bc9f MK	1	/* Target-dependent code for OpenBSD/powerpc.
d195bc9f MK	2
0fb0cc75 JB	3	Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
0fb0cc75 JB	4	Free Software Foundation, Inc.
d195bc9f MK	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
a9762ec7	10	the Free Software Foundation; either version 3 of the License, or
d195bc9f MK	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
a9762ec7	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
d195bc9f MK	20
	21	#include "defs.h"
	22	#include "arch-utils.h"
0dbe1904 MK	23	#include "frame.h"
0dbe1904 MK	24	#include "frame-unwind.h"
e6bb342a	25	#include "gdbtypes.h"
d195bc9f MK	26	#include "osabi.h"
	27	#include "regcache.h"
	28	#include "regset.h"
0dbe1904	29	#include "symtab.h"
18b2ae85	30	#include "trad-frame.h"
d195bc9f	31
18b2ae85	32	#include "gdb_assert.h"
d195bc9f MK	33	#include "gdb_string.h"
	34
	35	#include "ppc-tdep.h"
	36	#include "ppcobsd-tdep.h"
	37	#include "solib-svr4.h"
	38
	39	/* Register offsets from <machine/reg.h>. */
	40	struct ppc_reg_offsets ppcobsd_reg_offsets;
8599da2d	41	struct ppc_reg_offsets ppcobsd_fpreg_offsets;
d195bc9f MK	42	\f
	43
	44	/* Core file support. */
	45
	46	/* Supply register REGNUM in the general-purpose register set REGSET
	47	from the buffer specified by GREGS and LEN to register cache
	48	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	49
	50	void
	51	ppcobsd_supply_gregset (const struct regset *regset,
	52	struct regcache *regcache, int regnum,
	53	const void *gregs, size_t len)
	54	{
	55	ppc_supply_gregset (regset, regcache, regnum, gregs, len);
	56	ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
	57	}
	58
	59	/* Collect register REGNUM in the general-purpose register set
	60	REGSET. from register cache REGCACHE into the buffer specified by
	61	GREGS and LEN. If REGNUM is -1, do this for all registers in
	62	REGSET. */
	63
	64	void
	65	ppcobsd_collect_gregset (const struct regset *regset,
	66	const struct regcache *regcache, int regnum,
	67	void *gregs, size_t len)
	68	{
	69	ppc_collect_gregset (regset, regcache, regnum, gregs, len);
	70	ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
	71	}
	72
5d6210f0	73	/* OpenBSD/powerpc register set. */
d195bc9f MK	74
	75	struct regset ppcobsd_gregset =
	76	{
	77	&ppcobsd_reg_offsets,
	78	ppcobsd_supply_gregset
	79	};
	80
8599da2d MK	81	struct regset ppcobsd_fpregset =
	82	{
	83	&ppcobsd_fpreg_offsets,
	84	ppc_supply_fpregset
	85	};
	86
d195bc9f MK	87	/* Return the appropriate register set for the core section identified
	88	by SECT_NAME and SECT_SIZE. */
	89
	90	static const struct regset *
	91	ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
	92	const char *sect_name, size_t sect_size)
	93	{
	94	if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
	95	return &ppcobsd_gregset;
	96
	97	return NULL;
	98	}
	99	\f
	100
18b2ae85 MK	101	/* Signal trampolines. */
18b2ae85 MK	102
0dbe1904 MK	103	/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
	104	in virtual memory. The randomness makes it somewhat tricky to
	105	detect it, but fortunately we can rely on the fact that the start
	106	of the sigtramp routine is page-aligned. We recognize the
	107	trampoline by looking for the code that invokes the sigreturn
	108	system call. The offset where we can find that code varies from
	109	release to release.
	110
	111	By the way, the mapping mentioned above is read-only, so you cannot
	112	place a breakpoint in the signal trampoline. */
	113
	114	/* Default page size. */
	115	static const int ppcobsd_page_size = 4096;
	116
	117	/* Offset for sigreturn(2). */
	118	static const int ppcobsd_sigreturn_offset[] = {
	119	0x98, /* OpenBSD 3.8 */
	120	0x0c, /* OpenBSD 3.2 */
	121	-1
	122	};
	123
	124	static int
1af5d7ce UW	125	ppcobsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
	126	struct frame_info *this_frame,
	127	void **this_cache)
0dbe1904	128	{
1af5d7ce	129	CORE_ADDR pc = get_frame_pc (this_frame);
0dbe1904 MK	130	CORE_ADDR start_pc = (pc & ~(ppcobsd_page_size - 1));
	131	const int *offset;
	132	char *name;
	133
	134	find_pc_partial_function (pc, &name, NULL, NULL);
	135	if (name)
	136	return 0;
	137
	138	for (offset = ppcobsd_sigreturn_offset; *offset != -1; offset++)
	139	{
	140	gdb_byte buf[2 * PPC_INSN_SIZE];
	141	unsigned long insn;
	142
1af5d7ce	143	if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
0dbe1904 MK	144	buf, sizeof buf))
	145	continue;
	146
	147	/* Check for "li r0,SYS_sigreturn". */
	148	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
	149	if (insn != 0x38000067)
	150	continue;
	151
	152	/* Check for "sc". */
	153	insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, PPC_INSN_SIZE);
	154	if (insn != 0x44000002)
	155	continue;
	156
	157	return 1;
	158	}
	159
	160	return 0;
	161	}
	162
	163	static struct trad_frame_cache *
1af5d7ce	164	ppcobsd_sigtramp_frame_cache (struct frame_info this_frame, void *this_cache)
18b2ae85	165	{
1af5d7ce	166	struct gdbarch *gdbarch = get_frame_arch (this_frame);
18b2ae85	167	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
0dbe1904 MK	168	struct trad_frame_cache *cache;
	169	CORE_ADDR addr, base, func;
	170	gdb_byte buf[PPC_INSN_SIZE];
	171	unsigned long insn, sigcontext_offset;
18b2ae85 MK	172	int i;
18b2ae85 MK	173
0dbe1904 MK	174	if (*this_cache)
	175	return *this_cache;
	176
1af5d7ce	177	cache = trad_frame_cache_zalloc (this_frame);
0dbe1904 MK	178	*this_cache = cache;
0dbe1904 MK	179
1af5d7ce	180	func = get_frame_pc (this_frame);
0dbe1904	181	func &= ~(ppcobsd_page_size - 1);
1af5d7ce	182	if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
0dbe1904 MK	183	return cache;
	184
	185	/* Calculate the offset where we can find `struct sigcontext'. We
	186	base our calculation on the amount of stack space reserved by the
	187	first instruction of the signal trampoline. */
	188	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
	189	sigcontext_offset = (0x10000 - (insn & 0x0000ffff)) + 8;
	190
1af5d7ce	191	base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
0dbe1904	192	addr = base + sigcontext_offset + 2 * tdep->wordsize;
18b2ae85 MK	193	for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
	194	{
	195	int regnum = i + tdep->ppc_gp0_regnum;
0dbe1904	196	trad_frame_set_reg_addr (cache, regnum, addr);
18b2ae85	197	}
0dbe1904	198	trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
18b2ae85	199	addr += tdep->wordsize;
0dbe1904	200	trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
18b2ae85	201	addr += tdep->wordsize;
0dbe1904	202	trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
18b2ae85	203	addr += tdep->wordsize;
0dbe1904	204	trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
18b2ae85	205	addr += tdep->wordsize;
40a6adc1	206	trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
3e8c568d	207	/* SRR0? */
18b2ae85 MK	208	addr += tdep->wordsize;
	209
	210	/* Construct the frame ID using the function start. */
0dbe1904 MK	211	trad_frame_set_id (cache, frame_id_build (base, func));
	212
	213	return cache;
18b2ae85 MK	214	}
18b2ae85 MK	215
0dbe1904	216	static void
1af5d7ce	217	ppcobsd_sigtramp_frame_this_id (struct frame_info *this_frame,
0dbe1904 MK	218	void *this_cache, struct frame_id this_id)
	219	{
	220	struct trad_frame_cache *cache =
1af5d7ce	221	ppcobsd_sigtramp_frame_cache (this_frame, this_cache);
0dbe1904 MK	222
	223	trad_frame_get_id (cache, this_id);
	224	}
	225
1af5d7ce UW	226	static struct value *
	227	ppcobsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
	228	void **this_cache, int regnum)
18b2ae85	229	{
0dbe1904	230	struct trad_frame_cache *cache =
1af5d7ce	231	ppcobsd_sigtramp_frame_cache (this_frame, this_cache);
0dbe1904	232
1af5d7ce	233	return trad_frame_get_register (cache, this_frame, regnum);
0dbe1904 MK	234	}
	235
	236	static const struct frame_unwind ppcobsd_sigtramp_frame_unwind = {
18b2ae85	237	SIGTRAMP_FRAME,
0dbe1904	238	ppcobsd_sigtramp_frame_this_id,
1af5d7ce UW	239	ppcobsd_sigtramp_frame_prev_register,
	240	NULL,
	241	ppcobsd_sigtramp_frame_sniffer
18b2ae85	242	};
18b2ae85	243	\f
5d6210f0	244
d195bc9f MK	245	static void
	246	ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	247	{
5a49dfd0 MK	248	/* OpenBSD doesn't support the 128-bit `long double' from the psABI. */
5a49dfd0 MK	249	set_gdbarch_long_double_bit (gdbarch, 64);
8da61cc4	250	set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
5a49dfd0	251
a86c5ab2 MK	252	/* OpenBSD currently uses a broken GCC. */
	253	set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
	254
d195bc9f	255	/* OpenBSD uses SVR4-style shared libraries. */
d195bc9f MK	256	set_solib_svr4_fetch_link_map_offsets
	257	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
	258
	259	set_gdbarch_regset_from_core_section
	260	(gdbarch, ppcobsd_regset_from_core_section);
18b2ae85	261
1af5d7ce	262	frame_unwind_append_unwinder (gdbarch, &ppcobsd_sigtramp_frame_unwind);
d195bc9f MK	263	}
	264	\f
	265
	266	/* OpenBSD uses uses the traditional NetBSD core file format, even for
	267	ports that use ELF. */
	268	#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
	269
	270	static enum gdb_osabi
	271	ppcobsd_core_osabi_sniffer (bfd *abfd)
	272	{
	273	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	274	return GDB_OSABI_NETBSD_CORE;
	275
	276	return GDB_OSABI_UNKNOWN;
	277	}
	278	\f
	279
	280	/* Provide a prototype to silence -Wmissing-prototypes. */
	281	void _initialize_ppcobsd_tdep (void);
	282
	283	void
	284	_initialize_ppcobsd_tdep (void)
	285	{
	286	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	287	gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
	288	ppcobsd_core_osabi_sniffer);
	289
5d6210f0 MK	290	gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
5d6210f0 MK	291	ppcobsd_init_abi);
d195bc9f MK	292	gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
	293	ppcobsd_init_abi);
	294
	295	/* Avoid initializing the register offsets again if they were
	296	already initailized by ppcobsd-nat.c. */
	297	if (ppcobsd_reg_offsets.pc_offset == 0)
	298	{
	299	/* General-purpose registers. */
	300	ppcobsd_reg_offsets.r0_offset = 0;
f2db237a AM	301	ppcobsd_reg_offsets.gpr_size = 4;
f2db237a AM	302	ppcobsd_reg_offsets.xr_size = 4;
d195bc9f MK	303	ppcobsd_reg_offsets.pc_offset = 384;
	304	ppcobsd_reg_offsets.ps_offset = 388;
	305	ppcobsd_reg_offsets.cr_offset = 392;
	306	ppcobsd_reg_offsets.lr_offset = 396;
	307	ppcobsd_reg_offsets.ctr_offset = 400;
	308	ppcobsd_reg_offsets.xer_offset = 404;
	309	ppcobsd_reg_offsets.mq_offset = 408;
	310
	311	/* Floating-point registers. */
	312	ppcobsd_reg_offsets.f0_offset = 128;
	313	ppcobsd_reg_offsets.fpscr_offset = -1;
	314
	315	/* AltiVec registers. */
	316	ppcobsd_reg_offsets.vr0_offset = 0;
	317	ppcobsd_reg_offsets.vscr_offset = 512;
	318	ppcobsd_reg_offsets.vrsave_offset = 520;
	319	}
8599da2d MK	320
	321	if (ppcobsd_fpreg_offsets.fpscr_offset == 0)
	322	{
	323	/* Floating-point registers. */
	324	ppcobsd_reg_offsets.f0_offset = 0;
	325	ppcobsd_reg_offsets.fpscr_offset = 256;
f2db237a	326	ppcobsd_reg_offsets.fpscr_size = 4;
8599da2d	327	}
d195bc9f	328	}