[deliverable/binutils-gdb.git] / gdb / i386fbsd-tdep.c

/* Target-dependent code for FreeBSD/i386.

   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
   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 "gdbcore.h"
#include "osabi.h"
#include "regcache.h"

#include "gdb_assert.h"

#include "i386-tdep.h"
#include "i387-tdep.h"
#include "bsd-uthread.h"
#include "solib-svr4.h"

/* FreeBSD 3.0-RELEASE or later.  */

/* From <machine/reg.h>.  */
static int i386fbsd_r_reg_offset[] =
{
  9 * 4, 8 * 4, 7 * 4, 6 * 4,	/* %eax, %ecx, %edx, %ebx */
  15 * 4, 4 * 4,		/* %esp, %ebp */
  3 * 4, 2 * 4,			/* %esi, %edi */
  12 * 4, 14 * 4,		/* %eip, %eflags */
  13 * 4, 16 * 4,		/* %cs, %ss */
  1 * 4, 0 * 4, -1, -1		/* %ds, %es, %fs, %gs */
};

/* Sigtramp routine location.  */
CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;

/* From <machine/signal.h>.  */
int i386fbsd_sc_reg_offset[] =
{
  8 + 14 * 4,			/* %eax */
  8 + 13 * 4,			/* %ecx */
  8 + 12 * 4,			/* %edx */
  8 + 11 * 4,			/* %ebx */
  8 + 0 * 4,                    /* %esp */
  8 + 1 * 4,                    /* %ebp */
  8 + 10 * 4,                   /* %esi */
  8 + 9 * 4,                    /* %edi */
  8 + 3 * 4,                    /* %eip */
  8 + 4 * 4,                    /* %eflags */
  8 + 7 * 4,                    /* %cs */
  8 + 8 * 4,                    /* %ss */
  8 + 6 * 4,                    /* %ds */
  8 + 5 * 4,                    /* %es */
  8 + 15 * 4,			/* %fs */
  8 + 16 * 4			/* %gs */
};

/* From /usr/src/lib/libc/i386/gen/_setjmp.S.  */
static int i386fbsd_jmp_buf_reg_offset[] =
{
  -1,				/* %eax */
  -1,				/* %ecx */
  -1,				/* %edx */
  1 * 4,			/* %ebx */
  2 * 4,			/* %esp */
  3 * 4,			/* %ebp */
  4 * 4,			/* %esi */
  5 * 4,			/* %edi */
  0 * 4				/* %eip */
};

static void
i386fbsd_supply_uthread (struct regcache *regcache,
			 int regnum, CORE_ADDR addr)
{
  char buf[4];
  int i;

  gdb_assert (regnum >= -1);

  for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
    {
      if (i386fbsd_jmp_buf_reg_offset[i] != -1
	  && (regnum == -1 || regnum == i))
	{
	  read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
	  regcache_raw_supply (regcache, i, buf);
	}
    }
}

static void
i386fbsd_collect_uthread (const struct regcache *regcache,
			  int regnum, CORE_ADDR addr)
{
  char buf[4];
  int i;

  gdb_assert (regnum >= -1);

  for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
    {
      if (i386fbsd_jmp_buf_reg_offset[i] != -1
	  && (regnum == -1 || regnum == i))
	{
	  regcache_raw_collect (regcache, i, buf);
	  write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
	}
    }
}

static void
i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

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

  /* FreeBSD has a different `struct reg', and reserves some space for
     its FPU emulator in `struct fpreg'.  */
  tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
  tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
  tdep->sizeof_gregset = 18 * 4;
  tdep->sizeof_fpregset = 176;

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

  /* FreeBSD uses a different memory layout.  */
  tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
  tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;

  /* FreeBSD has a more complete `struct sigcontext'.  */
  tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
  tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);

  /* FreeBSD provides a user-level threads implementation.  */
  bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
  bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
}

static void
i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  /* It's almost identical to FreeBSD a.out.  */
  i386fbsdaout_init_abi (info, gdbarch);

  /* Except that it uses ELF.  */
  i386_elf_init_abi (info, gdbarch);

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

/* FreeBSD 4.0-RELEASE or later.  */

/* From <machine/reg.h>.  */
static int i386fbsd4_r_reg_offset[] =
{
  10 * 4, 9 * 4, 8 * 4, 7 * 4,	/* %eax, %ecx, %edx, %ebx */
  16 * 4, 5 * 4,		/* %esp, %ebp */
  4 * 4, 3 * 4,			/* %esi, %edi */
  13 * 4, 15 * 4,		/* %eip, %eflags */
  14 * 4, 17 * 4,		/* %cs, %ss */
  2 * 4, 1 * 4, 0 * 4, 18 * 4	/* %ds, %es, %fs, %gs */
};

/* From <machine/signal.h>.  */
int i386fbsd4_sc_reg_offset[] =
{
  20 + 11 * 4,			/* %eax */
  20 + 10 * 4,			/* %ecx */
  20 + 9 * 4,			/* %edx */
  20 + 8 * 4,			/* %ebx */
  20 + 17 * 4,			/* %esp */
  20 + 6 * 4,			/* %ebp */
  20 + 5 * 4,			/* %esi */
  20 + 4 * 4,			/* %edi */
  20 + 14 * 4,			/* %eip */
  20 + 16 * 4,			/* %eflags */
  20 + 15 * 4,			/* %cs */
  20 + 18 * 4,			/* %ss */
  20 + 3 * 4,			/* %ds */
  20 + 2 * 4,			/* %es */
  20 + 1 * 4,			/* %fs */
  20 + 0 * 4			/* %gs */
};

static void
i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Inherit stuff from older releases.  We assume that FreeBSD
     4.0-RELEASE always uses ELF.  */
  i386fbsd_init_abi (info, gdbarch);

  /* FreeBSD 4.0 introduced a new `struct reg'.  */
  tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
  tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
  tdep->sizeof_gregset = 19 * 4;

  /* FreeBSD 4.0 introduced a new `struct sigcontext'.  */
  tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
  tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
}

\f
/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_i386fbsd_tdep (void);

void
_initialize_i386fbsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
			  i386fbsdaout_init_abi);
  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
			  i386fbsd4_init_abi);
}
Commit	Line	Data
	1	/* Target-dependent code for FreeBSD/i386.
	2
	3	Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
	4	Free Software Foundation, Inc.
	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
	10	the Free Software Foundation; either version 3 of the License, or
	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
	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	20
	21	#include "defs.h"
	22	#include "arch-utils.h"
	23	#include "gdbcore.h"
	24	#include "osabi.h"
	25	#include "regcache.h"
	26
	27	#include "gdb_assert.h"
	28
	29	#include "i386-tdep.h"
	30	#include "i387-tdep.h"
	31	#include "bsd-uthread.h"
	32	#include "solib-svr4.h"
	33
	34	/* FreeBSD 3.0-RELEASE or later. */
	35
	36	/* From <machine/reg.h>. */
	37	static int i386fbsd_r_reg_offset[] =
	38	{
	39	9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */
	40	15 * 4, 4 * 4, /* %esp, %ebp */
	41	3 * 4, 2 * 4, /* %esi, %edi */
	42	12 * 4, 14 * 4, /* %eip, %eflags */
	43	13 * 4, 16 * 4, /* %cs, %ss */
	44	1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */
	45	};
	46
	47	/* Sigtramp routine location. */
	48	CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
	49	CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
	50
	51	/* From <machine/signal.h>. */
	52	int i386fbsd_sc_reg_offset[] =
	53	{
	54	8 + 14 * 4, /* %eax */
	55	8 + 13 * 4, /* %ecx */
	56	8 + 12 * 4, /* %edx */
	57	8 + 11 * 4, /* %ebx */
	58	8 + 0 * 4, /* %esp */
	59	8 + 1 * 4, /* %ebp */
	60	8 + 10 * 4, /* %esi */
	61	8 + 9 * 4, /* %edi */
	62	8 + 3 * 4, /* %eip */
	63	8 + 4 * 4, /* %eflags */
	64	8 + 7 * 4, /* %cs */
	65	8 + 8 * 4, /* %ss */
	66	8 + 6 * 4, /* %ds */
	67	8 + 5 * 4, /* %es */
	68	8 + 15 * 4, /* %fs */
	69	8 + 16 * 4 /* %gs */
	70	};
	71
	72	/* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
	73	static int i386fbsd_jmp_buf_reg_offset[] =
	74	{
	75	-1, /* %eax */
	76	-1, /* %ecx */
	77	-1, /* %edx */
	78	1 * 4, /* %ebx */
	79	2 * 4, /* %esp */
	80	3 * 4, /* %ebp */
	81	4 * 4, /* %esi */
	82	5 * 4, /* %edi */
	83	0 * 4 /* %eip */
	84	};
	85
	86	static void
	87	i386fbsd_supply_uthread (struct regcache *regcache,
	88	int regnum, CORE_ADDR addr)
	89	{
	90	char buf[4];
	91	int i;
	92
	93	gdb_assert (regnum >= -1);
	94
	95	for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
	96	{
	97	if (i386fbsd_jmp_buf_reg_offset[i] != -1
	98	&& (regnum == -1 \|\| regnum == i))
	99	{
	100	read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
	101	regcache_raw_supply (regcache, i, buf);
	102	}
	103	}
	104	}
	105
	106	static void
	107	i386fbsd_collect_uthread (const struct regcache *regcache,
	108	int regnum, CORE_ADDR addr)
	109	{
	110	char buf[4];
	111	int i;
	112
	113	gdb_assert (regnum >= -1);
	114
	115	for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
	116	{
	117	if (i386fbsd_jmp_buf_reg_offset[i] != -1
	118	&& (regnum == -1 \|\| regnum == i))
	119	{
	120	regcache_raw_collect (regcache, i, buf);
	121	write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
	122	}
	123	}
	124	}
	125
	126	static void
	127	i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	128	{
	129	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	130
	131	/* Obviously FreeBSD is BSD-based. */
	132	i386bsd_init_abi (info, gdbarch);
	133
	134	/* FreeBSD has a different `struct reg', and reserves some space for
	135	its FPU emulator in `struct fpreg'. */
	136	tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
	137	tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
	138	tdep->sizeof_gregset = 18 * 4;
	139	tdep->sizeof_fpregset = 176;
	140
	141	/* FreeBSD uses -freg-struct-return by default. */
	142	tdep->struct_return = reg_struct_return;
	143
	144	/* FreeBSD uses a different memory layout. */
	145	tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
	146	tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
	147
	148	/* FreeBSD has a more complete `struct sigcontext'. */
	149	tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
	150	tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
	151
	152	/* FreeBSD provides a user-level threads implementation. */
	153	bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
	154	bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
	155	}
	156
	157	static void
	158	i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	159	{
	160	/* It's almost identical to FreeBSD a.out. */
	161	i386fbsdaout_init_abi (info, gdbarch);
	162
	163	/* Except that it uses ELF. */
	164	i386_elf_init_abi (info, gdbarch);
	165
	166	/* FreeBSD ELF uses SVR4-style shared libraries. */
	167	set_solib_svr4_fetch_link_map_offsets
	168	(gdbarch, svr4_ilp32_fetch_link_map_offsets);
	169	}
	170
	171	/* FreeBSD 4.0-RELEASE or later. */
	172
	173	/* From <machine/reg.h>. */
	174	static int i386fbsd4_r_reg_offset[] =
	175	{
	176	10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
	177	16 * 4, 5 * 4, /* %esp, %ebp */
	178	4 * 4, 3 * 4, /* %esi, %edi */
	179	13 * 4, 15 * 4, /* %eip, %eflags */
	180	14 * 4, 17 * 4, /* %cs, %ss */
	181	2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
	182	};
	183
	184	/* From <machine/signal.h>. */
	185	int i386fbsd4_sc_reg_offset[] =
	186	{
	187	20 + 11 * 4, /* %eax */
	188	20 + 10 * 4, /* %ecx */
	189	20 + 9 * 4, /* %edx */
	190	20 + 8 * 4, /* %ebx */
	191	20 + 17 * 4, /* %esp */
	192	20 + 6 * 4, /* %ebp */
	193	20 + 5 * 4, /* %esi */
	194	20 + 4 * 4, /* %edi */
	195	20 + 14 * 4, /* %eip */
	196	20 + 16 * 4, /* %eflags */
	197	20 + 15 * 4, /* %cs */
	198	20 + 18 * 4, /* %ss */
	199	20 + 3 * 4, /* %ds */
	200	20 + 2 * 4, /* %es */
	201	20 + 1 * 4, /* %fs */
	202	20 + 0 * 4 /* %gs */
	203	};
	204
	205	static void
	206	i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	207	{
	208	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	209
	210	/* Inherit stuff from older releases. We assume that FreeBSD
	211	4.0-RELEASE always uses ELF. */
	212	i386fbsd_init_abi (info, gdbarch);
	213
	214	/* FreeBSD 4.0 introduced a new `struct reg'. */
	215	tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
	216	tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
	217	tdep->sizeof_gregset = 19 * 4;
	218
	219	/* FreeBSD 4.0 introduced a new `struct sigcontext'. */
	220	tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
	221	tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
	222	}
	223
	224	\f
	225	/* Provide a prototype to silence -Wmissing-prototypes. */
	226	void _initialize_i386fbsd_tdep (void);
	227
	228	void
	229	_initialize_i386fbsd_tdep (void)
	230	{
	231	gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
	232	i386fbsdaout_init_abi);
	233	gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
	234	i386fbsd4_init_abi);
	235	}