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

   Copyright (C) 2001, 2002, 2003, 2004, 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 "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);

}

/* 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);

}

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;

}

/* 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);

}