[deliverable/binutils-gdb.git] / gdb / i386nbsd-tdep.c

/* Target-dependent code for NetBSD/i386.

   Copyright (C) 1988-2014 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 "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "osabi.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"

#include "i386-tdep.h"
#include "i387-tdep.h"
#include "nbsd-tdep.h"
#include "solib-svr4.h"

/* From <machine/reg.h>.  */
static int i386nbsd_r_reg_offset[] =
{
  0 * 4,			/* %eax */
  1 * 4,			/* %ecx */
  2 * 4,			/* %edx */
  3 * 4,			/* %ebx */
  4 * 4,			/* %esp */
  5 * 4,			/* %ebp */
  6 * 4,			/* %esi */
  7 * 4,			/* %edi */
  8 * 4,			/* %eip */
  9 * 4,			/* %eflags */
  10 * 4,			/* %cs */
  11 * 4,			/* %ss */
  12 * 4,			/* %ds */
  13 * 4,			/* %es */
  14 * 4,			/* %fs */
  15 * 4			/* %gs */
};

/* From <machine/signal.h>.  */
int i386nbsd_sc_reg_offset[] =
{
  10 * 4,			/* %eax */
  9 * 4,			/* %ecx */
  8 * 4,			/* %edx */
  7 * 4,			/* %ebx */
  14 * 4,			/* %esp */
  6 * 4,			/* %ebp */
  5 * 4,			/* %esi */
  4 * 4,			/* %edi */
  11 * 4,			/* %eip */
  13 * 4,			/* %eflags */
  12 * 4,			/* %cs */
  15 * 4,			/* %ss */
  3 * 4,			/* %ds */
  2 * 4,			/* %es */
  1 * 4,			/* %fs */
  0 * 4				/* %gs */
};

/* From <machine/mcontext.h>.  */
int i386nbsd_mc_reg_offset[] =
{
  11 * 4,			/* %eax */
  10 * 4,			/* %ecx */
  9 * 4,			/* %edx */
  8 * 4,			/* %ebx */
  7 * 4,			/* %esp */
  6 * 4,			/* %ebp */
  5 * 4,			/* %esi */
  4 * 4,			/* %edi */
  14 * 4,			/* %eip */
  16 * 4,			/* %eflags */
  15 * 4,			/* %cs */
  18 * 4,			/* %ss */
  3 * 4,			/* %ds */
  2 * 4,			/* %es */
  1 * 4,			/* %fs */
  0 * 4				/* %gs */
};

static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
					  struct frame_info *,
					  struct trad_frame_cache *,
					  CORE_ADDR);

static const struct tramp_frame i386nbsd_sigtramp_sc16 =
{
  SIGTRAMP_FRAME,
  1,
  {
    { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
			/* leal  0x10(%esp), %eax */
    { 0x50, -1 },	/* pushl %eax */
    { 0x50, -1 },	/* pushl %eax */
    { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
			/* movl  $0x127, %eax		# __sigreturn14 */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
			/* movl  $0x1, %eax		# exit */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  i386nbsd_sigtramp_cache_init
};

static const struct tramp_frame i386nbsd_sigtramp_sc2 =
{
  SIGTRAMP_FRAME,
  1,
  {
    { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
			/* leal  0x0c(%esp), %eax */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
			/* movl  $0x127, %eax		# __sigreturn14 */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
			/* movl  $0x1, %eax */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  i386nbsd_sigtramp_cache_init
};

static const struct tramp_frame i386nbsd_sigtramp_si2 =
{
  SIGTRAMP_FRAME,
  1,
  {
    { 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
			/* movl  8(%esp),%eax */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
			/* movl  $0x134, %eax            # setcontext */
    { 0xcd, -1 }, { 0x80, -1 },
			/* int   $0x80 */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
			/* movl  $0x1, %eax */
    { 0xcd, -1 }, { 0x80, -1 },
			/* int   $0x80 */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  i386nbsd_sigtramp_cache_init
};

static const struct tramp_frame i386nbsd_sigtramp_si31 =
{
  SIGTRAMP_FRAME,
  1,
  {
    { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
        { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
			/* leal  0x8c(%esp), %eax */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
			/* movl  $0x134, %eax            # setcontext */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
			/* movl  $0x1, %eax */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  i386nbsd_sigtramp_cache_init
};

static const struct tramp_frame i386nbsd_sigtramp_si4 =
{
  SIGTRAMP_FRAME,
  1,
  {
    { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
        { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
			/* leal  0x8c(%esp), %eax */
    { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
			/* movl  %eax, 0x4(%esp) */
    { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
			/* movl  $0x134, %eax            # setcontext */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
        { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
			/* movl   $0xffffffff,0x4(%esp) */
    { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
			/* movl  $0x1, %eax */
    { 0xcd, -1 }, { 0x80, -1},
			/* int   $0x80 */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  i386nbsd_sigtramp_cache_init
};

static void
i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
			      struct frame_info *this_frame,
			      struct trad_frame_cache *this_cache,
			      CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
  CORE_ADDR base;
  int *reg_offset;
  int num_regs;
  int i;

  if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
    {
      reg_offset = i386nbsd_sc_reg_offset;
      num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);

      /* Read in the sigcontext address.  */
      base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
    }
  else
    {
      reg_offset = i386nbsd_mc_reg_offset;
      num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);

      /* Read in the ucontext address.  */
      base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
      /* offsetof(ucontext_t, uc_mcontext) == 36 */
      base += 36;
    }

  for (i = 0; i < num_regs; i++)
    if (reg_offset[i] != -1)
      trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);

  /* Construct the frame ID using the function start.  */
  trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
\f

static void 
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Obviously NetBSD is BSD-based.  */
  i386bsd_init_abi (info, gdbarch);

  /* NetBSD has a different `struct reg'.  */
  tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
  tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
  tdep->sizeof_gregset = 16 * 4;

  /* NetBSD uses -freg-struct-return by default.  */
  tdep->struct_return = reg_struct_return;

  /* NetBSD uses tramp_frame sniffers for signal trampolines.  */
  tdep->sigcontext_addr= 0;
  tdep->sigtramp_start = 0;
  tdep->sigtramp_end = 0;
  tdep->sigtramp_p = 0;
  tdep->sc_reg_offset = 0;
  tdep->sc_num_regs = 0;

  tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
  tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
  tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
  tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
  tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
}

/* NetBSD ELF.  */

static void
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* It's still NetBSD.  */
  i386nbsd_init_abi (info, gdbarch);

  /* But ELF-based.  */
  i386_elf_init_abi (info, gdbarch);

  /* NetBSD ELF uses SVR4-style shared libraries.  */
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

  /* NetBSD ELF uses -fpcc-struct-return by default.  */
  tdep->struct_return = pcc_struct_return;
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
extern initialize_file_ftype _initialize_i386nbsd_tdep;

void
_initialize_i386nbsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
			  i386nbsdelf_init_abi);
}
Commit	Line	Data
ed504bdf MK	1	/* Target-dependent code for NetBSD/i386.
ed504bdf MK	2
ecd75fc8	3	Copyright (C) 1988-2014 Free Software Foundation, Inc.
0fc93e6b C	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
0fc93e6b C	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/>. */
0fc93e6b C	19
0fc93e6b C	20	#include "defs.h"
13739f4d	21	#include "arch-utils.h"
911bc6ee	22	#include "frame.h"
dfe6eb1f JT	23	#include "gdbcore.h"
dfe6eb1f JT	24	#include "regcache.h"
13739f4d	25	#include "regset.h"
4be87837	26	#include "osabi.h"
911bc6ee	27	#include "symtab.h"
70f13f6b MK	28	#include "trad-frame.h"
70f13f6b MK	29	#include "tramp-frame.h"
0fc93e6b	30
3cac699e	31	#include "i386-tdep.h"
dfe6eb1f	32	#include "i387-tdep.h"
3cac699e	33	#include "nbsd-tdep.h"
7d400e77 JT	34	#include "solib-svr4.h"
7d400e77 JT	35
13739f4d MK	36	/* From <machine/reg.h>. */
13739f4d MK	37	static int i386nbsd_r_reg_offset[] =
dfe6eb1f	38	{
13739f4d MK	39	0 * 4, /* %eax */
	40	1 * 4, /* %ecx */
	41	2 * 4, /* %edx */
	42	3 * 4, /* %ebx */
	43	4 * 4, /* %esp */
	44	5 * 4, /* %ebp */
	45	6 * 4, /* %esi */
	46	7 * 4, /* %edi */
	47	8 * 4, /* %eip */
	48	9 * 4, /* %eflags */
	49	10 * 4, /* %cs */
	50	11 * 4, /* %ss */
	51	12 * 4, /* %ds */
	52	13 * 4, /* %es */
	53	14 * 4, /* %fs */
	54	15 * 4 /* %gs */
dfe6eb1f JT	55	};
dfe6eb1f JT	56
3cac699e	57	/* From <machine/signal.h>. */
13739f4d	58	int i386nbsd_sc_reg_offset[] =
a3386186 MK	59	{
	60	10 * 4, /* %eax */
	61	9 * 4, /* %ecx */
	62	8 * 4, /* %edx */
	63	7 * 4, /* %ebx */
	64	14 * 4, /* %esp */
	65	6 * 4, /* %ebp */
	66	5 * 4, /* %esi */
	67	4 * 4, /* %edi */
	68	11 * 4, /* %eip */
	69	13 * 4, /* %eflags */
	70	12 * 4, /* %cs */
	71	15 * 4, /* %ss */
	72	3 * 4, /* %ds */
	73	2 * 4, /* %es */
	74	1 * 4, /* %fs */
	75	0 * 4 /* %gs */
	76	};
3cac699e	77
70f13f6b MK	78	/* From <machine/mcontext.h>. */
	79	int i386nbsd_mc_reg_offset[] =
	80	{
	81	11 * 4, /* %eax */
	82	10 * 4, /* %ecx */
	83	9 * 4, /* %edx */
	84	8 * 4, /* %ebx */
	85	7 * 4, /* %esp */
	86	6 * 4, /* %ebp */
	87	5 * 4, /* %esi */
	88	4 * 4, /* %edi */
	89	14 * 4, /* %eip */
	90	16 * 4, /* %eflags */
	91	15 * 4, /* %cs */
	92	18 * 4, /* %ss */
	93	3 * 4, /* %ds */
	94	2 * 4, /* %es */
	95	1 * 4, /* %fs */
	96	0 * 4 /* %gs */
	97	};
	98
	99	static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
	100	struct frame_info *,
	101	struct trad_frame_cache *,
	102	CORE_ADDR);
	103
	104	static const struct tramp_frame i386nbsd_sigtramp_sc16 =
	105	{
	106	SIGTRAMP_FRAME,
	107	1,
	108	{
	109	{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
	110	/* leal 0x10(%esp), %eax */
	111	{ 0x50, -1 }, /* pushl %eax */
	112	{ 0x50, -1 }, /* pushl %eax */
	113	{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
	114	/* movl $0x127, %eax # __sigreturn14 */
	115	{ 0xcd, -1 }, { 0x80, -1},
	116	/* int $0x80 */
	117	{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
	118	/* movl $0x1, %eax # exit */
	119	{ 0xcd, -1 }, { 0x80, -1},
	120	/* int $0x80 */
	121	{ TRAMP_SENTINEL_INSN, -1 }
	122	},
	123	i386nbsd_sigtramp_cache_init
	124	};
	125
	126	static const struct tramp_frame i386nbsd_sigtramp_sc2 =
	127	{
	128	SIGTRAMP_FRAME,
	129	1,
	130	{
	131	{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
	132	/* leal 0x0c(%esp), %eax */
	133	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
	134	/* movl %eax, 0x4(%esp) */
	135	{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
	136	/* movl $0x127, %eax # __sigreturn14 */
	137	{ 0xcd, -1 }, { 0x80, -1},
	138	/* int $0x80 */
	139	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
	140	/* movl %eax, 0x4(%esp) */
	141	{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
142	/* movl $0x1, %eax */
143	{ 0xcd, -1 }, { 0x80, -1},
144	/* int $0x80 */
145	{ TRAMP_SENTINEL_INSN, -1 }
146	},
147	i386nbsd_sigtramp_cache_init
148	};
149
150	static const struct tramp_frame i386nbsd_sigtramp_si2 =
151	{
152	SIGTRAMP_FRAME,
153	1,
154	{
155	{ 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
156	/* movl 8(%esp),%eax */
157	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
158	/* movl %eax, 0x4(%esp) */
159	{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
160	/* movl $0x134, %eax # setcontext */
161	{ 0xcd, -1 }, { 0x80, -1 },
162	/* int $0x80 */
163	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
164	/* movl %eax, 0x4(%esp) */
165	{ 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
166	/* movl $0x1, %eax */
167	{ 0xcd, -1 }, { 0x80, -1 },
168	/* int $0x80 */
169	{ TRAMP_SENTINEL_INSN, -1 }
170	},
171	i386nbsd_sigtramp_cache_init
172	};
173
174	static const struct tramp_frame i386nbsd_sigtramp_si31 =
175	{
176	SIGTRAMP_FRAME,
177	1,
178	{
179	{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
180	{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
181	/* leal 0x8c(%esp), %eax */
182	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
183	/* movl %eax, 0x4(%esp) */
184	{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
185	/* movl $0x134, %eax # setcontext */
186	{ 0xcd, -1 }, { 0x80, -1},
187	/* int $0x80 */
188	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
189	/* movl %eax, 0x4(%esp) */
190	{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
191	/* movl $0x1, %eax */
192	{ 0xcd, -1 }, { 0x80, -1},
193	/* int $0x80 */
194	{ TRAMP_SENTINEL_INSN, -1 }
195	},
196	i386nbsd_sigtramp_cache_init
197	};
198
199	static const struct tramp_frame i386nbsd_sigtramp_si4 =
200	{
201	SIGTRAMP_FRAME,
202	1,
203	{
204	{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
205	{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
206	/* leal 0x8c(%esp), %eax */
207	{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
208	/* movl %eax, 0x4(%esp) */
209	{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
210	/* movl $0x134, %eax # setcontext */
211	{ 0xcd, -1 }, { 0x80, -1},
212	/* int $0x80 */
213	{ 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
214	{ 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
215	/* movl $0xffffffff,0x4(%esp) */
216	{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
217	/* movl $0x1, %eax */
218	{ 0xcd, -1 }, { 0x80, -1},
219	/* int $0x80 */
220	{ TRAMP_SENTINEL_INSN, -1 }
221	},
222	i386nbsd_sigtramp_cache_init
223	};
224
225	static void
226	i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
10458914 DJ	227	struct frame_info *this_frame,
	228	struct trad_frame_cache *this_cache,
	229	CORE_ADDR func)
70f13f6b	230	{
10458914	231	struct gdbarch *gdbarch = get_frame_arch (this_frame);
70f13f6b	232	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
e17a4113	233	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
10458914	234	CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
70f13f6b MK	235	CORE_ADDR base;
	236	int *reg_offset;
	237	int num_regs;
	238	int i;
	239
	240	if (self == &i386nbsd_sigtramp_sc16 \|\| self == &i386nbsd_sigtramp_sc2)
	241	{
	242	reg_offset = i386nbsd_sc_reg_offset;
	243	num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
	244
1777feb0	245	/* Read in the sigcontext address. */
e17a4113	246	base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
70f13f6b MK	247	}
	248	else
	249	{
	250	reg_offset = i386nbsd_mc_reg_offset;
	251	num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
	252
1777feb0	253	/* Read in the ucontext address. */
e17a4113	254	base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
70f13f6b MK	255	/* offsetof(ucontext_t, uc_mcontext) == 36 */
	256	base += 36;
	257	}
	258
	259	for (i = 0; i < num_regs; i++)
	260	if (reg_offset[i] != -1)
	261	trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
	262
	263	/* Construct the frame ID using the function start. */
	264	trad_frame_set_id (this_cache, frame_id_build (sp, func));
	265	}
	266	\f
	267
3cac699e JT	268	static void
	269	i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	270	{
	271	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	272
	273	/* Obviously NetBSD is BSD-based. */
	274	i386bsd_init_abi (info, gdbarch);
	275
13739f4d MK	276	/* NetBSD has a different `struct reg'. */
	277	tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
	278	tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
	279	tdep->sizeof_gregset = 16 * 4;
	280
3cac699e JT	281	/* NetBSD uses -freg-struct-return by default. */
	282	tdep->struct_return = reg_struct_return;
	283
1777feb0	284	/* NetBSD uses tramp_frame sniffers for signal trampolines. */
70f13f6b MK	285	tdep->sigcontext_addr= 0;
	286	tdep->sigtramp_start = 0;
	287	tdep->sigtramp_end = 0;
	288	tdep->sigtramp_p = 0;
	289	tdep->sc_reg_offset = 0;
	290	tdep->sc_num_regs = 0;
	291
	292	tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
	293	tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
	294	tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
	295	tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
	296	tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
13739f4d MK	297	}
13739f4d MK	298
3cac699e	299	/* NetBSD ELF. */
13739f4d	300
3cac699e JT	301	static void
	302	i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	303	{
	304	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	305
	306	/* It's still NetBSD. */
	307	i386nbsd_init_abi (info, gdbarch);
	308
	309	/* But ELF-based. */
	310	i386_elf_init_abi (info, gdbarch);
	311
	312	/* NetBSD ELF uses SVR4-style shared libraries. */
13739f4d	313	set_solib_svr4_fetch_link_map_offsets
7e654c37	314	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
3cac699e JT	315
	316	/* NetBSD ELF uses -fpcc-struct-return by default. */
	317	tdep->struct_return = pcc_struct_return;
3cac699e JT	318	}
3cac699e JT	319
63807e1d PA	320	/* Provide a prototype to silence -Wmissing-prototypes. */
	321	extern initialize_file_ftype _initialize_i386nbsd_tdep;
	322
dfe6eb1f JT	323	void
	324	_initialize_i386nbsd_tdep (void)
	325	{
05816f70	326	gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
3cac699e	327	i386nbsdelf_init_abi);
dfe6eb1f	328	}