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157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
/* Target-dependent code for i386 BSD's.
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Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "osabi.h"
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#include "gdb_string.h"
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#include "i386-tdep.h"
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/* Support for signal handlers. */
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/* Return whether PC is in a BSD sigtramp routine. */
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static int
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i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
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return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
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}
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/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
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routine, return the address of the associated sigcontext structure. */
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static CORE_ADDR
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i386bsd_sigcontext_addr (struct frame_info *next_frame)
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{
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char buf[4];
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CORE_ADDR sp;
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frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
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sp = extract_unsigned_integer (buf, 4);
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return read_memory_unsigned_integer (sp + 8, 4);
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}
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/* Return the start address of the sigtramp routine. */
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CORE_ADDR
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i386bsd_sigtramp_start (CORE_ADDR pc)
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{
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return gdbarch_tdep (current_gdbarch)->sigtramp_start;
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}
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/* Return the end address of the sigtramp routine. */
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CORE_ADDR
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i386bsd_sigtramp_end (CORE_ADDR pc)
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{
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return gdbarch_tdep (current_gdbarch)->sigtramp_end;
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}
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/* Support for shared libraries. */
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/* Return non-zero if we are in a shared library trampoline code stub. */
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int
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i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
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{
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return (name && !strcmp (name, "_DYNAMIC"));
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}
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/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
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/* From <machine/signal.h>. */
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int i386bsd_sc_reg_offset[] =
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{
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-1, /* %eax */
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-1, /* %ecx */
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-1, /* %edx */
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-1, /* %ebx */
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8 + 0 * 4, /* %esp */
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8 + 1 * 4, /* %ebp */
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-1, /* %esi */
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-1, /* %edi */
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8 + 3 * 4, /* %eip */
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8 + 4 * 4, /* %eflags */
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-1, /* %cs */
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-1, /* %ss */
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-1, /* %ds */
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-1, /* %es */
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-1, /* %fs */
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-1 /* %gs */
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};
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void
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i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
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/* Allow the recognition of sigtramps as a function named <sigtramp>. */
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set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start);
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set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end);
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/* Assume SunOS-style shared libraries. */
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set_gdbarch_in_solib_call_trampoline (gdbarch,
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i386bsd_aout_in_solib_call_trampoline);
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tdep->jb_pc_offset = 0;
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tdep->sigtramp_start = 0xfdbfdfc0;
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tdep->sigtramp_end = 0xfdbfe000;
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tdep->sigcontext_addr = i386bsd_sigcontext_addr;
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tdep->sc_reg_offset = i386bsd_sc_reg_offset;
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tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
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}
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static enum gdb_osabi
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i386bsd_aout_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
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return GDB_OSABI_NETBSD_AOUT;
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if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
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return GDB_OSABI_FREEBSD_AOUT;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_i386bsd_tdep (void);
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void
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_initialize_i386bsd_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
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i386bsd_aout_osabi_sniffer);
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}
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