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

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

   Copyright (C) 2001, 2002, 2003, 2004, 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 "gdbcore.h"
#include "regcache.h"
#include "osabi.h"

#include "gdb_string.h"

#include "i386-tdep.h"

/* Support for signal handlers.  */

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

static CORE_ADDR
i386bsd_sigcontext_addr (struct frame_info *this_frame)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  gdb_byte buf[4];
  CORE_ADDR sp;

  get_frame_register (this_frame, I386_ESP_REGNUM, buf);
  sp = extract_unsigned_integer (buf, 4, byte_order);

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

/* Support for shared libraries.  */

/* 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);

  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 (C) 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
	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 "frame.h"
	24	#include "gdbcore.h"
	25	#include "regcache.h"
	26	#include "osabi.h"
	27
	28	#include "gdb_string.h"
	29
	30	#include "i386-tdep.h"
	31
	32	/* Support for signal handlers. */
	33
	34	/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
	35	address of the associated sigcontext structure. */
	36
	37	static CORE_ADDR
	38	i386bsd_sigcontext_addr (struct frame_info *this_frame)
	39	{
	40	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	41	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	42	gdb_byte buf[4];
	43	CORE_ADDR sp;
	44
	45	get_frame_register (this_frame, I386_ESP_REGNUM, buf);
	46	sp = extract_unsigned_integer (buf, 4, byte_order);
	47
	48	return read_memory_unsigned_integer (sp + 8, 4, byte_order);
	49	}
	50	\f
	51
	52	/* Support for shared libraries. */
	53
	54	/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
	55
	56	/* From <machine/signal.h>. */
	57	int i386bsd_sc_reg_offset[] =
	58	{
	59	-1, /* %eax */
	60	-1, /* %ecx */
	61	-1, /* %edx */
	62	-1, /* %ebx */
	63	8 + 0 * 4, /* %esp */
	64	8 + 1 * 4, /* %ebp */
	65	-1, /* %esi */
	66	-1, /* %edi */
	67	8 + 3 * 4, /* %eip */
	68	8 + 4 * 4, /* %eflags */
	69	-1, /* %cs */
	70	-1, /* %ss */
	71	-1, /* %ds */
	72	-1, /* %es */
	73	-1, /* %fs */
	74	-1 /* %gs */
	75	};
	76
	77	void
	78	i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	79	{
	80	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	81
	82	tdep->jb_pc_offset = 0;
	83
	84	tdep->sigtramp_start = 0xfdbfdfc0;
	85	tdep->sigtramp_end = 0xfdbfe000;
	86	tdep->sigcontext_addr = i386bsd_sigcontext_addr;
	87	tdep->sc_reg_offset = i386bsd_sc_reg_offset;
	88	tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
	89	}
	90
	91	\f
	92	static enum gdb_osabi
	93	i386bsd_aout_osabi_sniffer (bfd *abfd)
	94	{
	95	if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
	96	return GDB_OSABI_NETBSD_AOUT;
	97
	98	if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
	99	return GDB_OSABI_FREEBSD_AOUT;
	100
	101	return GDB_OSABI_UNKNOWN;
	102	}
	103
	104	static enum gdb_osabi
	105	i386bsd_core_osabi_sniffer (bfd *abfd)
	106	{
	107	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	108	return GDB_OSABI_NETBSD_AOUT;
	109
	110	return GDB_OSABI_UNKNOWN;
	111	}
	112
	113	\f
	114	/* Provide a prototype to silence -Wmissing-prototypes. */
	115	void _initialize_i386bsd_tdep (void);
	116
	117	void
	118	_initialize_i386bsd_tdep (void)
	119	{
	120	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
	121	i386bsd_aout_osabi_sniffer);
	122
	123	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	124	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
	125	i386bsd_core_osabi_sniffer);
	126	}