157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
/* Target-dependent code for i386 BSD's.
|
||
|
||
Copyright 2001, 2002, 2003 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. */
|
||
|
||
/* Return whether PC is in a BSD sigtramp routine. */
|
||
|
||
static int
|
||
i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
|
||
|
||
return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
|
||
}
|
||
|
||
/* 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);
|
||
}
|
||
|
||
/* Return the start address of the sigtramp routine. */
|
||
|
||
CORE_ADDR
|
||
i386bsd_sigtramp_start (CORE_ADDR pc)
|
||
{
|
||
return gdbarch_tdep (current_gdbarch)->sigtramp_start;
|
||
}
|
||
|
||
/* Return the end address of the sigtramp routine. */
|
||
|
||
CORE_ADDR
|
||
i386bsd_sigtramp_end (CORE_ADDR pc)
|
||
{
|
||
return gdbarch_tdep (current_gdbarch)->sigtramp_end;
|
||
}
|
||
|
||
|
||
/* 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);
|
||
|
||
set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
|
||
|
||
/* Allow the recognition of sigtramps as a function named <sigtramp>. */
|
||
set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start);
|
||
set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end);
|
||
|
||
/* 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);
|
||
}
|
||
|
||
|
||
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;
|
||
}
|
||
|
||
|
||
/* 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);
|
||
}
|