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

/* Target-dependent code for OpenBSD/powerpc.

   Copyright (C) 2004, 2005, 2006, 2007, 2008 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_p (struct frame_info *next_frame)
{
  CORE_ADDR pc = frame_pc_unwind (next_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 (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 *
ppcobsd_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;
  gdb_byte 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 &= ~(ppcobsd_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,
					 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 *next_frame,
				void **this_cache, struct frame_id *this_id)
{
  struct trad_frame_cache *cache =
    ppcobsd_sigtramp_frame_cache (next_frame, this_cache);

  trad_frame_get_id (cache, this_id);
}

static void
ppcobsd_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,
				      gdb_byte *valuep)
{
  struct trad_frame_cache *cache =
    ppcobsd_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 ppcobsd_sigtramp_frame_unwind = {
  SIGTRAMP_FRAME,
  ppcobsd_sigtramp_frame_this_id,
  ppcobsd_sigtramp_frame_prev_register
};

static const struct frame_unwind *
ppcobsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
  if (ppcobsd_sigtramp_p (next_frame))
    return &ppcobsd_sigtramp_frame_unwind;

  return NULL;
}
\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_sniffer (gdbarch, ppcobsd_sigtramp_frame_sniffer);
}
\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
9b254dd1	3	Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
d195bc9f MK	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
a9762ec7	9	the Free Software Foundation; either version 3 of the License, or
d195bc9f MK	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
a9762ec7	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
d195bc9f MK	19
	20	#include "defs.h"
	21	#include "arch-utils.h"
0dbe1904 MK	22	#include "frame.h"
0dbe1904 MK	23	#include "frame-unwind.h"
e6bb342a	24	#include "gdbtypes.h"
d195bc9f MK	25	#include "osabi.h"
	26	#include "regcache.h"
	27	#include "regset.h"
0dbe1904	28	#include "symtab.h"
18b2ae85	29	#include "trad-frame.h"
d195bc9f	30
18b2ae85	31	#include "gdb_assert.h"
d195bc9f MK	32	#include "gdb_string.h"
	33
	34	#include "ppc-tdep.h"
	35	#include "ppcobsd-tdep.h"
	36	#include "solib-svr4.h"
	37
	38	/* Register offsets from <machine/reg.h>. */
	39	struct ppc_reg_offsets ppcobsd_reg_offsets;
8599da2d	40	struct ppc_reg_offsets ppcobsd_fpreg_offsets;
d195bc9f MK	41	\f
	42
	43	/* Core file support. */
	44
	45	/* Supply register REGNUM in the general-purpose register set REGSET
	46	from the buffer specified by GREGS and LEN to register cache
	47	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	48
	49	void
	50	ppcobsd_supply_gregset (const struct regset *regset,
	51	struct regcache *regcache, int regnum,
	52	const void *gregs, size_t len)
	53	{
	54	ppc_supply_gregset (regset, regcache, regnum, gregs, len);
	55	ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
	56	}
	57
	58	/* Collect register REGNUM in the general-purpose register set
	59	REGSET. from register cache REGCACHE into the buffer specified by
	60	GREGS and LEN. If REGNUM is -1, do this for all registers in
	61	REGSET. */
	62
	63	void
	64	ppcobsd_collect_gregset (const struct regset *regset,
	65	const struct regcache *regcache, int regnum,
	66	void *gregs, size_t len)
	67	{
	68	ppc_collect_gregset (regset, regcache, regnum, gregs, len);
	69	ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
	70	}
	71
5d6210f0	72	/* OpenBSD/powerpc register set. */
d195bc9f MK	73
	74	struct regset ppcobsd_gregset =
	75	{
	76	&ppcobsd_reg_offsets,
	77	ppcobsd_supply_gregset
	78	};
	79
8599da2d MK	80	struct regset ppcobsd_fpregset =
	81	{
	82	&ppcobsd_fpreg_offsets,
	83	ppc_supply_fpregset
	84	};
	85
d195bc9f MK	86	/* Return the appropriate register set for the core section identified
	87	by SECT_NAME and SECT_SIZE. */
	88
	89	static const struct regset *
	90	ppcobsd_regset_from_core_section (struct gdbarch *gdbarch,
	91	const char *sect_name, size_t sect_size)
	92	{
	93	if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412)
	94	return &ppcobsd_gregset;
	95
	96	return NULL;
	97	}
	98	\f
	99
18b2ae85 MK	100	/* Signal trampolines. */
18b2ae85 MK	101
0dbe1904 MK	102	/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
	103	in virtual memory. The randomness makes it somewhat tricky to
	104	detect it, but fortunately we can rely on the fact that the start
	105	of the sigtramp routine is page-aligned. We recognize the
	106	trampoline by looking for the code that invokes the sigreturn
	107	system call. The offset where we can find that code varies from
	108	release to release.
	109
	110	By the way, the mapping mentioned above is read-only, so you cannot
	111	place a breakpoint in the signal trampoline. */
	112
	113	/* Default page size. */
	114	static const int ppcobsd_page_size = 4096;
	115
	116	/* Offset for sigreturn(2). */
	117	static const int ppcobsd_sigreturn_offset[] = {
	118	0x98, /* OpenBSD 3.8 */
	119	0x0c, /* OpenBSD 3.2 */
	120	-1
	121	};
	122
	123	static int
	124	ppcobsd_sigtramp_p (struct frame_info *next_frame)
	125	{
	126	CORE_ADDR pc = frame_pc_unwind (next_frame);
	127	CORE_ADDR start_pc = (pc & ~(ppcobsd_page_size - 1));
	128	const int *offset;
	129	char *name;
	130
	131	find_pc_partial_function (pc, &name, NULL, NULL);
	132	if (name)
	133	return 0;
	134
	135	for (offset = ppcobsd_sigreturn_offset; *offset != -1; offset++)
	136	{
	137	gdb_byte buf[2 * PPC_INSN_SIZE];
	138	unsigned long insn;
	139
	140	if (!safe_frame_unwind_memory (next_frame, start_pc + *offset,
	141	buf, sizeof buf))
	142	continue;
	143
	144	/* Check for "li r0,SYS_sigreturn". */
	145	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
	146	if (insn != 0x38000067)
	147	continue;
	148
	149	/* Check for "sc". */
	150	insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, PPC_INSN_SIZE);
	151	if (insn != 0x44000002)
	152	continue;
	153
	154	return 1;
	155	}
	156
	157	return 0;
	158	}
	159
	160	static struct trad_frame_cache *
	161	ppcobsd_sigtramp_frame_cache (struct frame_info next_frame, void *this_cache)
18b2ae85 MK	162	{
	163	struct gdbarch *gdbarch = get_frame_arch (next_frame);
	164	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
0dbe1904 MK	165	struct trad_frame_cache *cache;
	166	CORE_ADDR addr, base, func;
	167	gdb_byte buf[PPC_INSN_SIZE];
	168	unsigned long insn, sigcontext_offset;
18b2ae85 MK	169	int i;
18b2ae85 MK	170
0dbe1904 MK	171	if (*this_cache)
	172	return *this_cache;
	173
	174	cache = trad_frame_cache_zalloc (next_frame);
	175	*this_cache = cache;
	176
	177	func = frame_pc_unwind (next_frame);
	178	func &= ~(ppcobsd_page_size - 1);
	179	if (!safe_frame_unwind_memory (next_frame, func, buf, sizeof buf))
	180	return cache;
	181
	182	/* Calculate the offset where we can find `struct sigcontext'. We
	183	base our calculation on the amount of stack space reserved by the
	184	first instruction of the signal trampoline. */
	185	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE);
	186	sigcontext_offset = (0x10000 - (insn & 0x0000ffff)) + 8;
	187
3e8c568d	188	base = frame_unwind_register_unsigned (next_frame,
40a6adc1	189	gdbarch_sp_regnum (gdbarch));
0dbe1904	190	addr = base + sigcontext_offset + 2 * tdep->wordsize;
18b2ae85 MK	191	for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
	192	{
	193	int regnum = i + tdep->ppc_gp0_regnum;
0dbe1904	194	trad_frame_set_reg_addr (cache, regnum, addr);
18b2ae85	195	}
0dbe1904	196	trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
18b2ae85	197	addr += tdep->wordsize;
0dbe1904	198	trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
18b2ae85	199	addr += tdep->wordsize;
0dbe1904	200	trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
18b2ae85	201	addr += tdep->wordsize;
0dbe1904	202	trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
18b2ae85	203	addr += tdep->wordsize;
40a6adc1	204	trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
3e8c568d	205	/* SRR0? */
18b2ae85 MK	206	addr += tdep->wordsize;
	207
	208	/* Construct the frame ID using the function start. */
0dbe1904 MK	209	trad_frame_set_id (cache, frame_id_build (base, func));
	210
	211	return cache;
18b2ae85 MK	212	}
18b2ae85 MK	213
0dbe1904 MK	214	static void
	215	ppcobsd_sigtramp_frame_this_id (struct frame_info *next_frame,
	216	void *this_cache, struct frame_id this_id)
	217	{
	218	struct trad_frame_cache *cache =
	219	ppcobsd_sigtramp_frame_cache (next_frame, this_cache);
	220
	221	trad_frame_get_id (cache, this_id);
	222	}
	223
	224	static void
	225	ppcobsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
	226	void **this_cache, int regnum,
	227	int optimizedp, enum lval_type lvalp,
	228	CORE_ADDR addrp, int realnump,
	229	gdb_byte *valuep)
18b2ae85	230	{
0dbe1904 MK	231	struct trad_frame_cache *cache =
	232	ppcobsd_sigtramp_frame_cache (next_frame, this_cache);
	233
	234	trad_frame_get_register (cache, next_frame, regnum,
	235	optimizedp, lvalp, addrp, realnump, valuep);
	236	}
	237
	238	static const struct frame_unwind ppcobsd_sigtramp_frame_unwind = {
18b2ae85	239	SIGTRAMP_FRAME,
0dbe1904 MK	240	ppcobsd_sigtramp_frame_this_id,
0dbe1904 MK	241	ppcobsd_sigtramp_frame_prev_register
18b2ae85	242	};
0dbe1904 MK	243
	244	static const struct frame_unwind *
	245	ppcobsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
	246	{
	247	if (ppcobsd_sigtramp_p (next_frame))
	248	return &ppcobsd_sigtramp_frame_unwind;
	249
	250	return NULL;
	251	}
18b2ae85	252	\f
5d6210f0	253
d195bc9f MK	254	static void
	255	ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	256	{
5a49dfd0 MK	257	/* OpenBSD doesn't support the 128-bit `long double' from the psABI. */
5a49dfd0 MK	258	set_gdbarch_long_double_bit (gdbarch, 64);
8da61cc4	259	set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
5a49dfd0	260
a86c5ab2 MK	261	/* OpenBSD currently uses a broken GCC. */
	262	set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
	263
d195bc9f	264	/* OpenBSD uses SVR4-style shared libraries. */
d195bc9f MK	265	set_solib_svr4_fetch_link_map_offsets
	266	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
	267
	268	set_gdbarch_regset_from_core_section
	269	(gdbarch, ppcobsd_regset_from_core_section);
18b2ae85	270
0dbe1904	271	frame_unwind_append_sniffer (gdbarch, ppcobsd_sigtramp_frame_sniffer);
d195bc9f MK	272	}
	273	\f
	274
	275	/* OpenBSD uses uses the traditional NetBSD core file format, even for
	276	ports that use ELF. */
	277	#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
	278
	279	static enum gdb_osabi
	280	ppcobsd_core_osabi_sniffer (bfd *abfd)
	281	{
	282	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	283	return GDB_OSABI_NETBSD_CORE;
	284
	285	return GDB_OSABI_UNKNOWN;
	286	}
	287	\f
	288
	289	/* Provide a prototype to silence -Wmissing-prototypes. */
	290	void _initialize_ppcobsd_tdep (void);
	291
	292	void
	293	_initialize_ppcobsd_tdep (void)
	294	{
	295	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	296	gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
	297	ppcobsd_core_osabi_sniffer);
	298
5d6210f0 MK	299	gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
5d6210f0 MK	300	ppcobsd_init_abi);
d195bc9f MK	301	gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
	302	ppcobsd_init_abi);
	303
	304	/* Avoid initializing the register offsets again if they were
	305	already initailized by ppcobsd-nat.c. */
	306	if (ppcobsd_reg_offsets.pc_offset == 0)
	307	{
	308	/* General-purpose registers. */
	309	ppcobsd_reg_offsets.r0_offset = 0;
f2db237a AM	310	ppcobsd_reg_offsets.gpr_size = 4;
f2db237a AM	311	ppcobsd_reg_offsets.xr_size = 4;
d195bc9f MK	312	ppcobsd_reg_offsets.pc_offset = 384;
	313	ppcobsd_reg_offsets.ps_offset = 388;
	314	ppcobsd_reg_offsets.cr_offset = 392;
	315	ppcobsd_reg_offsets.lr_offset = 396;
	316	ppcobsd_reg_offsets.ctr_offset = 400;
	317	ppcobsd_reg_offsets.xer_offset = 404;
	318	ppcobsd_reg_offsets.mq_offset = 408;
	319
	320	/* Floating-point registers. */
	321	ppcobsd_reg_offsets.f0_offset = 128;
	322	ppcobsd_reg_offsets.fpscr_offset = -1;
	323
	324	/* AltiVec registers. */
	325	ppcobsd_reg_offsets.vr0_offset = 0;
	326	ppcobsd_reg_offsets.vscr_offset = 512;
	327	ppcobsd_reg_offsets.vrsave_offset = 520;
	328	}
8599da2d MK	329
	330	if (ppcobsd_fpreg_offsets.fpscr_offset == 0)
	331	{
	332	/* Floating-point registers. */
	333	ppcobsd_reg_offsets.f0_offset = 0;
	334	ppcobsd_reg_offsets.fpscr_offset = 256;
f2db237a	335	ppcobsd_reg_offsets.fpscr_size = 4;
8599da2d	336	}
d195bc9f	337	}