[deliverable/binutils-gdb.git] / gdb / i386-bsd-tdep.c

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

   Copyright (C) 2001-2016 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 "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) 2001-2016 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 3 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, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
	21	#include "arch-utils.h"
	22	#include "frame.h"
	23	#include "gdbcore.h"
	24	#include "regcache.h"
	25	#include "osabi.h"
	26
	27	#include "i386-tdep.h"
	28
	29	/* Support for signal handlers. */
	30
	31	/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
	32	address of the associated sigcontext structure. */
	33
	34	static CORE_ADDR
	35	i386bsd_sigcontext_addr (struct frame_info *this_frame)
	36	{
	37	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	38	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	39	gdb_byte buf[4];
	40	CORE_ADDR sp;
	41
	42	get_frame_register (this_frame, I386_ESP_REGNUM, buf);
	43	sp = extract_unsigned_integer (buf, 4, byte_order);
	44
	45	return read_memory_unsigned_integer (sp + 8, 4, byte_order);
	46	}
	47	\f
	48
	49	/* Support for shared libraries. */
	50
	51	/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
	52
	53	/* From <machine/signal.h>. */
	54	int i386bsd_sc_reg_offset[] =
	55	{
	56	-1, /* %eax */
	57	-1, /* %ecx */
	58	-1, /* %edx */
	59	-1, /* %ebx */
	60	8 + 0 * 4, /* %esp */
	61	8 + 1 * 4, /* %ebp */
	62	-1, /* %esi */
	63	-1, /* %edi */
	64	8 + 3 * 4, /* %eip */
	65	8 + 4 * 4, /* %eflags */
	66	-1, /* %cs */
	67	-1, /* %ss */
	68	-1, /* %ds */
	69	-1, /* %es */
	70	-1, /* %fs */
	71	-1 /* %gs */
	72	};
	73
	74	void
	75	i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	76	{
	77	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
	78
	79	tdep->jb_pc_offset = 0;
	80
	81	tdep->sigtramp_start = 0xfdbfdfc0;
	82	tdep->sigtramp_end = 0xfdbfe000;
	83	tdep->sigcontext_addr = i386bsd_sigcontext_addr;
	84	tdep->sc_reg_offset = i386bsd_sc_reg_offset;
	85	tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
	86	}
	87
	88	\f
	89	static enum gdb_osabi
	90	i386bsd_aout_osabi_sniffer (bfd *abfd)
	91	{
	92	if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
	93	return GDB_OSABI_NETBSD_AOUT;
	94
	95	if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
	96	return GDB_OSABI_FREEBSD_AOUT;
	97
	98	return GDB_OSABI_UNKNOWN;
	99	}
	100
	101	static enum gdb_osabi
	102	i386bsd_core_osabi_sniffer (bfd *abfd)
	103	{
	104	if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
	105	return GDB_OSABI_NETBSD_AOUT;
	106
	107	return GDB_OSABI_UNKNOWN;
	108	}
	109
	110	\f
	111	/* Provide a prototype to silence -Wmissing-prototypes. */
	112	void _initialize_i386bsd_tdep (void);
	113
	114	void
	115	_initialize_i386bsd_tdep (void)
	116	{
	117	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
	118	i386bsd_aout_osabi_sniffer);
	119
	120	/* BFD doesn't set a flavour for NetBSD style a.out core files. */
	121	gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
	122	i386bsd_core_osabi_sniffer);
	123	}