[deliverable/binutils-gdb.git] / gdb / i386bsd-tdep.c

/* Target-dependent code for i386 BSD's.

   Copyright 2001, 2002, 2003, 2004 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 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "osabi.h"

#include "gdb_string.h"

#include "i386-tdep.h"

/* Support for signal handlers.  */

/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
   routine, return the address of the associated sigcontext structure.  */

static CORE_ADDR
i386bsd_sigcontext_addr (struct frame_info *next_frame)
{
  char buf[4];
  CORE_ADDR sp;

  frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
  sp = extract_unsigned_integer (buf, 4);

  return read_memory_unsigned_integer (sp + 8, 4);
}
\f

/* Support for shared libraries.  */

/* Return non-zero if we are in a shared library trampoline code stub.  */

int
i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
{
  return (name && !strcmp (name, "_DYNAMIC"));
}

/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */

/* From <machine/signal.h>.  */
int i386bsd_sc_reg_offset[] =
{
  -1,				/* %eax */
  -1,				/* %ecx */
  -1,				/* %edx */
  -1,				/* %ebx */
  8 + 0 * 4,			/* %esp */
  8 + 1 * 4,			/* %ebp */
  -1,				/* %esi */
  -1,				/* %edi */
  8 + 3 * 4,			/* %eip */
  8 + 4 * 4,			/* %eflags */
  -1,				/* %cs */
  -1,				/* %ss */
  -1,				/* %ds */
  -1,				/* %es */
  -1,				/* %fs */
  -1				/* %gs */
};

void
i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Assume SunOS-style shared libraries.  */
  set_gdbarch_in_solib_call_trampoline (gdbarch,
					i386bsd_aout_in_solib_call_trampoline);

  tdep->jb_pc_offset = 0;

  tdep->sigtramp_start = 0xfdbfdfc0;
  tdep->sigtramp_end = 0xfdbfe000;
  tdep->sigcontext_addr = i386bsd_sigcontext_addr;
  tdep->sc_reg_offset = i386bsd_sc_reg_offset;
  tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
}

\f
static enum gdb_osabi
i386bsd_aout_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
    return GDB_OSABI_NETBSD_AOUT;

  if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
    return GDB_OSABI_FREEBSD_AOUT;

  return GDB_OSABI_UNKNOWN;
}

static enum gdb_osabi
i386bsd_core_osabi_sniffer (bfd *abfd)
{
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
    return GDB_OSABI_NETBSD_AOUT;

  return GDB_OSABI_UNKNOWN;
}

\f
/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_i386bsd_tdep (void);

void
_initialize_i386bsd_tdep (void)
{
  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
				  i386bsd_aout_osabi_sniffer);

  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
  gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
				  i386bsd_core_osabi_sniffer);
}
Commit	Line	Data
	1	/* Target-dependent code for i386 BSD's.
	2
	3	Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
	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
	9	the Free Software Foundation; either version 2 of the License, or
	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
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
	21
	22	#include "defs.h"
	23	#include "arch-utils.h"
	24	#include "frame.h"
	25	#include "gdbcore.h"
	26	#include "regcache.h"
	27	#include "osabi.h"
	28
	29	#include "gdb_string.h"
	30
	31	#include "i386-tdep.h"
	32
	33	/* Support for signal handlers. */
	34
	35	/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
	36	routine, return the address of the associated sigcontext structure. */
	37
	38	static CORE_ADDR
	39	i386bsd_sigcontext_addr (struct frame_info *next_frame)
	40	{
	41	char buf[4];
	42	CORE_ADDR sp;
	43
	44	frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
	45	sp = extract_unsigned_integer (buf, 4);
	46
	47	return read_memory_unsigned_integer (sp + 8, 4);
	48	}
	49	\f
	50
	51	/* Support for shared libraries. */
	52
	53	/* Return non-zero if we are in a shared library trampoline code stub. */
	54
	55	int
	56	i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
	57	{
	58	return (name && !strcmp (name, "_DYNAMIC"));
	59	}
	60
	61	/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
	62
	63	/* From <machine/signal.h>. */
	64	int i386bsd_sc_reg_offset[] =
	65	{
	66	-1, /* %eax */
	67	-1, /* %ecx */
	68	-1, /* %edx */
	69	-1, /* %ebx */
	70	8 + 0 * 4, /* %esp */
	71	8 + 1 * 4, /* %ebp */
	72	-1, /* %esi */
	73	-1, /* %edi */
	74	8 + 3 * 4, /* %eip */
	75	8 + 4 * 4, /* %eflags */
	76	-1, /* %cs */
	77	-1, /* %ss */
	78	-1, /* %ds */
	79	-1, /* %es */
	80	-1, /* %fs */
	81	-1 /* %gs */
	82	};
	83
	84	void
	85	i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	86	{
	87	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	88
	89	/* Assume SunOS-style shared libraries. */
	90	set_gdbarch_in_solib_call_trampoline (gdbarch,
	91	i386bsd_aout_in_solib_call_trampoline);
	92
	93	tdep->jb_pc_offset = 0;
	94
	95	tdep->sigtramp_start = 0xfdbfdfc0;
	96	tdep->sigtramp_end = 0xfdbfe000;
	97	tdep->sigcontext_addr = i386bsd_sigcontext_addr;
	98	tdep->sc_reg_offset = i386bsd_sc_reg_offset;
	99	tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
	100	}
	101
	102	\f
	103	static enum gdb_osabi
	104	i386bsd_aout_osabi_sniffer (bfd *abfd)
	105	{
	106	if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
	107	return GDB_OSABI_NETBSD_AOUT;
	108
	109	if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
	110	return GDB_OSABI_FREEBSD_AOUT;
	111
	112	return GDB_OSABI_UNKNOWN;
	113	}
	114
	115	static enum gdb_osabi
	116	i386bsd_core_osabi_sniffer (bfd *abfd)
	117	{
	118	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	119	return GDB_OSABI_NETBSD_AOUT;
	120
	121	return GDB_OSABI_UNKNOWN;
	122	}
	123
	124	\f
	125	/* Provide a prototype to silence -Wmissing-prototypes. */
	126	void _initialize_i386bsd_tdep (void);
	127
	128	void
	129	_initialize_i386bsd_tdep (void)
	130	{
	131	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
	132	i386bsd_aout_osabi_sniffer);
	133
	134	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	135	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
	136	i386bsd_core_osabi_sniffer);
	137	}