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

/* Target-dependent code for NetBSD/alpha.

   Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.

   Contributed by Wasabi Systems, 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 "frame.h"
#include "gdbcore.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "value.h"

#include "gdb_assert.h"
#include "gdb_string.h"

#include "alpha-tdep.h"
#include "alphabsd-tdep.h"
#include "nbsd-tdep.h"
#include "solib-svr4.h"

/* Core file support.  */

/* Even though NetBSD/alpha used ELF since day one, it used the
   traditional a.out-style core dump format before NetBSD 1.6.  */

/* Sizeof `struct reg' in <machine/reg.h>.  */
#define ALPHANBSD_SIZEOF_GREGS	(32 * 8)

/* Sizeof `struct fpreg' in <machine/reg.h.  */
#define ALPHANBSD_SIZEOF_FPREGS	((32 * 8) + 8)

/* Supply register REGNUM from the buffer specified by FPREGS and LEN
   in the floating-point register set REGSET to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

static void
alphanbsd_supply_fpregset (const struct regset *regset,
			   struct regcache *regcache,
			   int regnum, const void *fpregs, size_t len)
{
  const gdb_byte *regs = fpregs;
  int i;

  gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);

  for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
    {
      if (regnum == i || regnum == -1)
	regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8);
    }

  if (regnum == ALPHA_FPCR_REGNUM || regnum == -1)
    regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8);
}

/* Supply register REGNUM from the buffer specified by GREGS and LEN
   in the general-purpose register set REGSET to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

static void
alphanbsd_supply_gregset (const struct regset *regset,
			  struct regcache *regcache,
			  int regnum, const void *gregs, size_t len)
{
  const gdb_byte *regs = gregs;
  int i;

  gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);

  for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
    {
      if (regnum == i || regnum == -1)
	regcache_raw_supply (regcache, i, regs + i * 8);
    }

  if (regnum == ALPHA_PC_REGNUM || regnum == -1)
    regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
}

/* Supply register REGNUM from the buffer specified by GREGS and LEN
   in the general-purpose register set REGSET to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

static void
alphanbsd_aout_supply_gregset (const struct regset *regset,
			       struct regcache *regcache,
			       int regnum, const void *gregs, size_t len)
{
  const gdb_byte *regs = gregs;
  int i;

  /* Table to map a GDB register number to a trapframe register index.  */
  static const int regmap[] =
  {
     0,   1,   2,   3,
     4,   5,   6,   7,
     8,   9,  10,  11,
    12,  13,  14,  15, 
    30,  31,  32,  16, 
    17,  18,  19,  20,
    21,  22,  23,  24,
    25,  29,  26
  };

  gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);

  for (i = 0; i < ARRAY_SIZE(regmap); i++)
    {
      if (regnum == i || regnum == -1)
	regcache_raw_supply (regcache, i, regs + regmap[i] * 8);
    }

  if (regnum == ALPHA_PC_REGNUM || regnum == -1)
    regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);

  if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
    {
      regs += ALPHANBSD_SIZEOF_GREGS;
      len -= ALPHANBSD_SIZEOF_GREGS;
      alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
    }
}

/* NetBSD/alpha register sets.  */

static struct regset alphanbsd_gregset =
{
  NULL,
  alphanbsd_supply_gregset
};

static struct regset alphanbsd_fpregset =
{
  NULL,
  alphanbsd_supply_fpregset
};

static struct regset alphanbsd_aout_gregset =
{
  NULL,
  alphanbsd_aout_supply_gregset
};

/* Return the appropriate register set for the core section identified
   by SECT_NAME and SECT_SIZE.  */

const struct regset *
alphanbsd_regset_from_core_section (struct gdbarch *gdbarch,
				    const char *sect_name, size_t sect_size)
{
  if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS)
    {
      if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
	return &alphanbsd_aout_gregset;
      else
	return &alphanbsd_gregset;
    }

  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS)
    return &alphanbsd_fpregset;

  return NULL;
}
\f

/* Signal trampolines.  */

/* Under NetBSD/alpha, signal handler invocations can be identified by the
   designated code sequence that is used to return from a signal handler.
   In particular, the return address of a signal handler points to the
   following code sequence:

	ldq	a0, 0(sp)
	lda	sp, 16(sp)
	lda	v0, 295(zero)	# __sigreturn14
	call_pal callsys

   Each instruction has a unique encoding, so we simply attempt to match
   the instruction the PC is pointing to with any of the above instructions.
   If there is a hit, we know the offset to the start of the designated
   sequence and can then check whether we really are executing in the
   signal trampoline.  If not, -1 is returned, otherwise the offset from the
   start of the return sequence is returned.  */
static const unsigned char sigtramp_retcode[] =
{
  0x00, 0x00, 0x1e, 0xa6,	/* ldq a0, 0(sp) */
  0x10, 0x00, 0xde, 0x23,	/* lda sp, 16(sp) */
  0x27, 0x01, 0x1f, 0x20,	/* lda v0, 295(zero) */
  0x83, 0x00, 0x00, 0x00,	/* call_pal callsys */
};
#define RETCODE_NWORDS		4
#define RETCODE_SIZE		(RETCODE_NWORDS * 4)

static LONGEST
alphanbsd_sigtramp_offset (CORE_ADDR pc)
{
  unsigned char ret[RETCODE_SIZE], w[4];
  LONGEST off;
  int i;

  if (read_memory_nobpt (pc, (char *) w, 4) != 0)
    return -1;

  for (i = 0; i < RETCODE_NWORDS; i++)
    {
      if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
	break;
    }
  if (i == RETCODE_NWORDS)
    return (-1);

  off = i * 4;
  pc -= off;

  if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
    return -1;

  if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
    return off;

  return -1;
}

static int
alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
{
  return (nbsd_pc_in_sigtramp (pc, func_name)
	  || alphanbsd_sigtramp_offset (pc) >= 0);
}

static CORE_ADDR
alphanbsd_sigcontext_addr (struct frame_info *frame)
{
  /* FIXME: This is not correct for all versions of NetBSD/alpha.
     We will probably need to disassemble the trampoline to figure
     out which trampoline frame type we have.  */
  return get_frame_base (frame);
}
\f

static void
alphanbsd_init_abi (struct gdbarch_info info,
                    struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Hook into the DWARF CFI frame unwinder.  */
  alpha_dwarf2_init_abi (info, gdbarch);

  /* Hook into the MDEBUG frame unwinder.  */
  alpha_mdebug_init_abi (info, gdbarch);

  /* NetBSD/alpha does not provide single step support via ptrace(2); we
     must use software single-stepping.  */
  set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);

  /* NetBSD/alpha has SVR4-style shared libraries.  */
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_lp64_fetch_link_map_offsets);

  tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
  tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp;
  tdep->sigcontext_addr = alphanbsd_sigcontext_addr;

  tdep->jb_pc = 2;
  tdep->jb_elt_size = 8;

  set_gdbarch_regset_from_core_section
    (gdbarch, alphanbsd_regset_from_core_section);
}
\f

static enum gdb_osabi
alphanbsd_core_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
    return GDB_OSABI_NETBSD_ELF;

  return GDB_OSABI_UNKNOWN;
}
\f

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

void
_initialize_alphanbsd_tdep (void)
{
  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
  gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour,
                                  alphanbsd_core_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
                          alphanbsd_init_abi);
}
Commit	Line	Data
789f3b5f MK	1	/* Target-dependent code for NetBSD/alpha.
789f3b5f MK	2
6aba47ca	3	Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
2031c21a	4
da8ca43d JT	5	Contributed by Wasabi Systems, Inc.
	6
	7	This file is part of GDB.
	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
197e01b6 EZ	21	Foundation, Inc., 51 Franklin Street, Fifth Floor,
197e01b6 EZ	22	Boston, MA 02110-1301, USA. */
da8ca43d JT	23
da8ca43d JT	24	#include "defs.h"
2ca8ae21	25	#include "frame.h"
3beabdb2 MK	26	#include "gdbcore.h"
3beabdb2 MK	27	#include "osabi.h"
8513dd2d	28	#include "regcache.h"
3beabdb2	29	#include "regset.h"
da8ca43d	30	#include "value.h"
da8ca43d	31
3beabdb2	32	#include "gdb_assert.h"
cca0d3b0	33	#include "gdb_string.h"
9964235a	34
da8ca43d	35	#include "alpha-tdep.h"
8513dd2d	36	#include "alphabsd-tdep.h"
ea5bc2a6	37	#include "nbsd-tdep.h"
527ca6bb	38	#include "solib-svr4.h"
8513dd2d	39
3beabdb2 MK	40	/* Core file support. */
	41
	42	/* Even though NetBSD/alpha used ELF since day one, it used the
	43	traditional a.out-style core dump format before NetBSD 1.6. */
	44
	45	/* Sizeof `struct reg' in <machine/reg.h>. */
	46	#define ALPHANBSD_SIZEOF_GREGS (32 * 8)
	47
	48	/* Sizeof `struct fpreg' in <machine/reg.h. */
	49	#define ALPHANBSD_SIZEOF_FPREGS ((32 * 8) + 8)
	50
	51	/* Supply register REGNUM from the buffer specified by FPREGS and LEN
	52	in the floating-point register set REGSET to register cache
	53	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	54
8513dd2d	55	static void
3beabdb2 MK	56	alphanbsd_supply_fpregset (const struct regset *regset,
	57	struct regcache *regcache,
	58	int regnum, const void *fpregs, size_t len)
8513dd2d	59	{
3beabdb2 MK	60	const gdb_byte *regs = fpregs;
	61	int i;
	62
	63	gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);
	64
	65	for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
	66	{
	67	if (regnum == i \|\| regnum == -1)
	68	regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8);
	69	}
	70
	71	if (regnum == ALPHA_FPCR_REGNUM \|\| regnum == -1)
	72	regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8);
	73	}
	74
	75	/* Supply register REGNUM from the buffer specified by GREGS and LEN
	76	in the general-purpose register set REGSET to register cache
	77	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
8513dd2d	78
3beabdb2 MK	79	static void
	80	alphanbsd_supply_gregset (const struct regset *regset,
	81	struct regcache *regcache,
	82	int regnum, const void *gregs, size_t len)
	83	{
	84	const gdb_byte *regs = gregs;
	85	int i;
	86
	87	gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
	88
	89	for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
	90	{
	91	if (regnum == i \|\| regnum == -1)
	92	regcache_raw_supply (regcache, i, regs + i * 8);
	93	}
	94
	95	if (regnum == ALPHA_PC_REGNUM \|\| regnum == -1)
	96	regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
	97	}
	98
	99	/* Supply register REGNUM from the buffer specified by GREGS and LEN
	100	in the general-purpose register set REGSET to register cache
	101	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	102
	103	static void
	104	alphanbsd_aout_supply_gregset (const struct regset *regset,
	105	struct regcache *regcache,
	106	int regnum, const void *gregs, size_t len)
	107	{
	108	const gdb_byte *regs = gregs;
	109	int i;
	110
	111	/* Table to map a GDB register number to a trapframe register index. */
8513dd2d JT	112	static const int regmap[] =
	113	{
	114	0, 1, 2, 3,
	115	4, 5, 6, 7,
	116	8, 9, 10, 11,
	117	12, 13, 14, 15,
	118	30, 31, 32, 16,
	119	17, 18, 19, 20,
	120	21, 22, 23, 24,
	121	25, 29, 26
	122	};
8513dd2d	123
3beabdb2	124	gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
8513dd2d	125
3beabdb2	126	for (i = 0; i < ARRAY_SIZE(regmap); i++)
8513dd2d	127	{
3beabdb2 MK	128	if (regnum == i \|\| regnum == -1)
3beabdb2 MK	129	regcache_raw_supply (regcache, i, regs + regmap[i] * 8);
8513dd2d JT	130	}
8513dd2d JT	131
3beabdb2 MK	132	if (regnum == ALPHA_PC_REGNUM \|\| regnum == -1)
3beabdb2 MK	133	regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
8513dd2d	134
3beabdb2	135	if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
8513dd2d	136	{
3beabdb2 MK	137	regs += ALPHANBSD_SIZEOF_GREGS;
	138	len -= ALPHANBSD_SIZEOF_GREGS;
	139	alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
8513dd2d JT	140	}
	141	}
	142
3beabdb2 MK	143	/* NetBSD/alpha register sets. */
	144
	145	static struct regset alphanbsd_gregset =
8513dd2d	146	{
3beabdb2 MK	147	NULL,
3beabdb2 MK	148	alphanbsd_supply_gregset
8513dd2d JT	149	};
8513dd2d JT	150
3beabdb2	151	static struct regset alphanbsd_fpregset =
8513dd2d	152	{
3beabdb2 MK	153	NULL,
3beabdb2 MK	154	alphanbsd_supply_fpregset
8513dd2d	155	};
da8ca43d	156
3beabdb2 MK	157	static struct regset alphanbsd_aout_gregset =
	158	{
	159	NULL,
	160	alphanbsd_aout_supply_gregset
	161	};
	162
	163	/* Return the appropriate register set for the core section identified
	164	by SECT_NAME and SECT_SIZE. */
	165
b0ca8573	166	const struct regset *
3beabdb2 MK	167	alphanbsd_regset_from_core_section (struct gdbarch *gdbarch,
	168	const char *sect_name, size_t sect_size)
	169	{
	170	if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS)
b0ca8573 MK	171	{
	172	if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
	173	return &alphanbsd_aout_gregset;
	174	else
	175	return &alphanbsd_gregset;
	176	}
3beabdb2 MK	177
	178	if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS)
	179	return &alphanbsd_fpregset;
	180
	181	return NULL;
	182	}
3beabdb2 MK	183	\f
	184
	185	/* Signal trampolines. */
	186
da8ca43d JT	187	/* Under NetBSD/alpha, signal handler invocations can be identified by the
	188	designated code sequence that is used to return from a signal handler.
	189	In particular, the return address of a signal handler points to the
	190	following code sequence:
	191
	192	ldq a0, 0(sp)
	193	lda sp, 16(sp)
	194	lda v0, 295(zero) # __sigreturn14
	195	call_pal callsys
	196
	197	Each instruction has a unique encoding, so we simply attempt to match
	198	the instruction the PC is pointing to with any of the above instructions.
	199	If there is a hit, we know the offset to the start of the designated
	200	sequence and can then check whether we really are executing in the
	201	signal trampoline. If not, -1 is returned, otherwise the offset from the
	202	start of the return sequence is returned. */
cfef91e4	203	static const unsigned char sigtramp_retcode[] =
da8ca43d	204	{
cfef91e4 JT	205	0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */
	206	0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */
	207	0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */
	208	0x83, 0x00, 0x00, 0x00, /* call_pal callsys */
da8ca43d	209	};
cfef91e4 JT	210	#define RETCODE_NWORDS 4
cfef91e4 JT	211	#define RETCODE_SIZE (RETCODE_NWORDS * 4)
da8ca43d	212
b0ca8573	213	static LONGEST
da8ca43d JT	214	alphanbsd_sigtramp_offset (CORE_ADDR pc)
da8ca43d JT	215	{
cfef91e4	216	unsigned char ret[RETCODE_SIZE], w[4];
da8ca43d JT	217	LONGEST off;
	218	int i;
	219
359a9262	220	if (read_memory_nobpt (pc, (char *) w, 4) != 0)
da8ca43d JT	221	return -1;
	222
	223	for (i = 0; i < RETCODE_NWORDS; i++)
	224	{
cfef91e4	225	if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
da8ca43d JT	226	break;
	227	}
	228	if (i == RETCODE_NWORDS)
	229	return (-1);
	230
	231	off = i * 4;
	232	pc -= off;
	233
359a9262	234	if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
da8ca43d JT	235	return -1;
da8ca43d JT	236
cfef91e4	237	if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
da8ca43d JT	238	return off;
	239
	240	return -1;
	241	}
	242
6c72f9f9 JT	243	static int
	244	alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name)
	245	{
3d9b49b0 JT	246	return (nbsd_pc_in_sigtramp (pc, func_name)
3d9b49b0 JT	247	\|\| alphanbsd_sigtramp_offset (pc) >= 0);
6c72f9f9 JT	248	}
6c72f9f9 JT	249
2ca8ae21 JT	250	static CORE_ADDR
	251	alphanbsd_sigcontext_addr (struct frame_info *frame)
	252	{
	253	/* FIXME: This is not correct for all versions of NetBSD/alpha.
	254	We will probably need to disassemble the trampoline to figure
	255	out which trampoline frame type we have. */
f534e522	256	return get_frame_base (frame);
2ca8ae21	257	}
b0ca8573	258	\f
2ca8ae21	259
da8ca43d JT	260	static void
	261	alphanbsd_init_abi (struct gdbarch_info info,
	262	struct gdbarch *gdbarch)
	263	{
	264	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	265
baa490c4 RH	266	/* Hook into the DWARF CFI frame unwinder. */
	267	alpha_dwarf2_init_abi (info, gdbarch);
	268
	269	/* Hook into the MDEBUG frame unwinder. */
	270	alpha_mdebug_init_abi (info, gdbarch);
	271
da8ca43d JT	272	/* NetBSD/alpha does not provide single step support via ptrace(2); we
	273	must use software single-stepping. */
	274	set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
	275
789f3b5f MK	276	/* NetBSD/alpha has SVR4-style shared libraries. */
	277	set_solib_svr4_fetch_link_map_offsets
	278	(gdbarch, svr4_lp64_fetch_link_map_offsets);
da8ca43d JT	279
da8ca43d JT	280	tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
f2524b93	281	tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp;
2ca8ae21	282	tdep->sigcontext_addr = alphanbsd_sigcontext_addr;
accc6d1f JT	283
	284	tdep->jb_pc = 2;
	285	tdep->jb_elt_size = 8;
3beabdb2 MK	286
	287	set_gdbarch_regset_from_core_section
	288	(gdbarch, alphanbsd_regset_from_core_section);
	289	}
3beabdb2 MK	290	\f
	291
	292	static enum gdb_osabi
	293	alphanbsd_core_osabi_sniffer (bfd *abfd)
	294	{
	295	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
b0ca8573	296	return GDB_OSABI_NETBSD_ELF;
3beabdb2 MK	297
	298	return GDB_OSABI_UNKNOWN;
	299	}
	300	\f
	301
	302	/* Provide a prototype to silence -Wmissing-prototypes. */
	303	void _initialize_alphanbsd_tdep (void);
da8ca43d JT	304
	305	void
	306	_initialize_alphanbsd_tdep (void)
	307	{
3beabdb2 MK	308	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	309	gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour,
	310	alphanbsd_core_osabi_sniffer);
	311
05816f70	312	gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
70f80edf	313	alphanbsd_init_abi);
da8ca43d	314	}