gdb/i386bsd-tdep.c - gdb

Global variables defined

Functions defined

Source code

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

  3.    Copyright (C) 2001-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  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.

  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.

  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/>.  */

  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"

  27. #include "i386-tdep.h"

  29. /* Support for signal handlers.  */

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

  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;

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

  45.   return read_memory_unsigned_integer (sp + 8, 4, byte_order);
  46. }


  49. /* Support for shared libraries.  */

  51. /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */

  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. };

  74. void
  75. ‌i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  76. {
  77.   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  79.   tdep->jb_pc_offset = 0;

  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. }


  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;

  95.   if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
  96.     return GDB_OSABI_FREEBSD_AOUT;

  98.   return GDB_OSABI_UNKNOWN;
  99. }

  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;

  107.   return GDB_OSABI_UNKNOWN;
  108. }


  111. /* Provide a prototype to silence -Wmissing-prototypes.  */
  112. void _initialize_i386bsd_tdep (void);

  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);

  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. }