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

/* Target-dependent code for OpenBSD/powerpc.

   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   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)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  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, byte_order);
      if (insn != 0x38000067)
	continue;

      /* Check for "sc".  */
      insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
				       PPC_INSN_SIZE, byte_order);
      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);
  enum bfd_endian byte_order = gdbarch_byte_order (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, byte_order);
  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
7b6bb8da	3	Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
0fb0cc75	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
0df8b418	60	REGSET, from register cache REGCACHE into the buffer specified by
d195bc9f MK	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	{
e17a4113 UW	129	struct gdbarch *gdbarch = get_frame_arch (this_frame);
e17a4113 UW	130	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1af5d7ce	131	CORE_ADDR pc = get_frame_pc (this_frame);
0dbe1904 MK	132	CORE_ADDR start_pc = (pc & ~(ppcobsd_page_size - 1));
	133	const int *offset;
	134	char *name;
	135
	136	find_pc_partial_function (pc, &name, NULL, NULL);
	137	if (name)
	138	return 0;
	139
	140	for (offset = ppcobsd_sigreturn_offset; *offset != -1; offset++)
	141	{
	142	gdb_byte buf[2 * PPC_INSN_SIZE];
	143	unsigned long insn;
	144
1af5d7ce	145	if (!safe_frame_unwind_memory (this_frame, start_pc + *offset,
0dbe1904 MK	146	buf, sizeof buf))
	147	continue;
	148
	149	/* Check for "li r0,SYS_sigreturn". */
e17a4113	150	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
0dbe1904 MK	151	if (insn != 0x38000067)
	152	continue;
	153
	154	/* Check for "sc". */
e17a4113 UW	155	insn = extract_unsigned_integer (buf + PPC_INSN_SIZE,
e17a4113 UW	156	PPC_INSN_SIZE, byte_order);
0dbe1904 MK	157	if (insn != 0x44000002)
	158	continue;
	159
	160	return 1;
	161	}
	162
	163	return 0;
	164	}
	165
	166	static struct trad_frame_cache *
1af5d7ce	167	ppcobsd_sigtramp_frame_cache (struct frame_info this_frame, void *this_cache)
18b2ae85	168	{
1af5d7ce	169	struct gdbarch *gdbarch = get_frame_arch (this_frame);
18b2ae85	170	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
e17a4113	171	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
0dbe1904 MK	172	struct trad_frame_cache *cache;
	173	CORE_ADDR addr, base, func;
	174	gdb_byte buf[PPC_INSN_SIZE];
	175	unsigned long insn, sigcontext_offset;
18b2ae85 MK	176	int i;
18b2ae85 MK	177
0dbe1904 MK	178	if (*this_cache)
	179	return *this_cache;
	180
1af5d7ce	181	cache = trad_frame_cache_zalloc (this_frame);
0dbe1904 MK	182	*this_cache = cache;
0dbe1904 MK	183
1af5d7ce	184	func = get_frame_pc (this_frame);
0dbe1904	185	func &= ~(ppcobsd_page_size - 1);
1af5d7ce	186	if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf))
0dbe1904 MK	187	return cache;
	188
	189	/* Calculate the offset where we can find `struct sigcontext'. We
	190	base our calculation on the amount of stack space reserved by the
	191	first instruction of the signal trampoline. */
e17a4113	192	insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order);
0dbe1904 MK	193	sigcontext_offset = (0x10000 - (insn & 0x0000ffff)) + 8;
0dbe1904 MK	194
1af5d7ce	195	base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
0dbe1904	196	addr = base + sigcontext_offset + 2 * tdep->wordsize;
18b2ae85 MK	197	for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize)
	198	{
	199	int regnum = i + tdep->ppc_gp0_regnum;
0dbe1904	200	trad_frame_set_reg_addr (cache, regnum, addr);
18b2ae85	201	}
0dbe1904	202	trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr);
18b2ae85	203	addr += tdep->wordsize;
0dbe1904	204	trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr);
18b2ae85	205	addr += tdep->wordsize;
0dbe1904	206	trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr);
18b2ae85	207	addr += tdep->wordsize;
0dbe1904	208	trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr);
18b2ae85	209	addr += tdep->wordsize;
40a6adc1	210	trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr);
0df8b418	211	/* SRR0? */
18b2ae85 MK	212	addr += tdep->wordsize;
	213
	214	/* Construct the frame ID using the function start. */
0dbe1904 MK	215	trad_frame_set_id (cache, frame_id_build (base, func));
	216
	217	return cache;
18b2ae85 MK	218	}
18b2ae85 MK	219
0dbe1904	220	static void
1af5d7ce	221	ppcobsd_sigtramp_frame_this_id (struct frame_info *this_frame,
0dbe1904 MK	222	void *this_cache, struct frame_id this_id)
	223	{
	224	struct trad_frame_cache *cache =
1af5d7ce	225	ppcobsd_sigtramp_frame_cache (this_frame, this_cache);
0dbe1904 MK	226
	227	trad_frame_get_id (cache, this_id);
	228	}
	229
1af5d7ce UW	230	static struct value *
	231	ppcobsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
	232	void **this_cache, int regnum)
18b2ae85	233	{
0dbe1904	234	struct trad_frame_cache *cache =
1af5d7ce	235	ppcobsd_sigtramp_frame_cache (this_frame, this_cache);
0dbe1904	236
1af5d7ce	237	return trad_frame_get_register (cache, this_frame, regnum);
0dbe1904 MK	238	}
	239
	240	static const struct frame_unwind ppcobsd_sigtramp_frame_unwind = {
18b2ae85	241	SIGTRAMP_FRAME,
0dbe1904	242	ppcobsd_sigtramp_frame_this_id,
1af5d7ce UW	243	ppcobsd_sigtramp_frame_prev_register,
	244	NULL,
	245	ppcobsd_sigtramp_frame_sniffer
18b2ae85	246	};
18b2ae85	247	\f
5d6210f0	248
d195bc9f MK	249	static void
	250	ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	251	{
5a49dfd0 MK	252	/* OpenBSD doesn't support the 128-bit `long double' from the psABI. */
5a49dfd0 MK	253	set_gdbarch_long_double_bit (gdbarch, 64);
8da61cc4	254	set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
5a49dfd0	255
a86c5ab2 MK	256	/* OpenBSD currently uses a broken GCC. */
	257	set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value);
	258
d195bc9f	259	/* OpenBSD uses SVR4-style shared libraries. */
d195bc9f MK	260	set_solib_svr4_fetch_link_map_offsets
	261	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
	262
	263	set_gdbarch_regset_from_core_section
	264	(gdbarch, ppcobsd_regset_from_core_section);
18b2ae85	265
1af5d7ce	266	frame_unwind_append_unwinder (gdbarch, &ppcobsd_sigtramp_frame_unwind);
d195bc9f MK	267	}
	268	\f
	269
	270	/* OpenBSD uses uses the traditional NetBSD core file format, even for
	271	ports that use ELF. */
	272	#define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
	273
	274	static enum gdb_osabi
	275	ppcobsd_core_osabi_sniffer (bfd *abfd)
	276	{
	277	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	278	return GDB_OSABI_NETBSD_CORE;
	279
	280	return GDB_OSABI_UNKNOWN;
	281	}
	282	\f
	283
	284	/* Provide a prototype to silence -Wmissing-prototypes. */
	285	void _initialize_ppcobsd_tdep (void);
	286
	287	void
	288	_initialize_ppcobsd_tdep (void)
	289	{
	290	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	291	gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour,
	292	ppcobsd_core_osabi_sniffer);
	293
5d6210f0 MK	294	gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF,
5d6210f0 MK	295	ppcobsd_init_abi);
d195bc9f MK	296	gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF,
	297	ppcobsd_init_abi);
	298
	299	/* Avoid initializing the register offsets again if they were
	300	already initailized by ppcobsd-nat.c. */
	301	if (ppcobsd_reg_offsets.pc_offset == 0)
	302	{
	303	/* General-purpose registers. */
	304	ppcobsd_reg_offsets.r0_offset = 0;
f2db237a AM	305	ppcobsd_reg_offsets.gpr_size = 4;
f2db237a AM	306	ppcobsd_reg_offsets.xr_size = 4;
d195bc9f MK	307	ppcobsd_reg_offsets.pc_offset = 384;
	308	ppcobsd_reg_offsets.ps_offset = 388;
	309	ppcobsd_reg_offsets.cr_offset = 392;
	310	ppcobsd_reg_offsets.lr_offset = 396;
	311	ppcobsd_reg_offsets.ctr_offset = 400;
	312	ppcobsd_reg_offsets.xer_offset = 404;
	313	ppcobsd_reg_offsets.mq_offset = 408;
	314
	315	/* Floating-point registers. */
	316	ppcobsd_reg_offsets.f0_offset = 128;
	317	ppcobsd_reg_offsets.fpscr_offset = -1;
	318
	319	/* AltiVec registers. */
	320	ppcobsd_reg_offsets.vr0_offset = 0;
	321	ppcobsd_reg_offsets.vscr_offset = 512;
	322	ppcobsd_reg_offsets.vrsave_offset = 520;
	323	}
8599da2d MK	324
	325	if (ppcobsd_fpreg_offsets.fpscr_offset == 0)
	326	{
	327	/* Floating-point registers. */
	328	ppcobsd_reg_offsets.f0_offset = 0;
	329	ppcobsd_reg_offsets.fpscr_offset = 256;
f2db237a	330	ppcobsd_reg_offsets.fpscr_size = 4;
8599da2d	331	}
d195bc9f	332	}