gdb/i386bsd-tdep.c

   1 /* Target-dependent code for i386 BSD's.
   2
   3    Copyright (C) 2001, 2002, 2003, 2004, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "arch-utils.h"
  23 #include "frame.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include "osabi.h"
  27
  28 #include "gdb_string.h"
  29
  30 #include "i386-tdep.h"
  31
  32 /* Support for signal handlers.  */
  33
  34 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
  35    address of the associated sigcontext structure.  */
  36
  37 static CORE_ADDR
  38 i386bsd_sigcontext_addr (struct frame_info *this_frame)
  39 {
  40   gdb_byte buf[4];
  41   CORE_ADDR sp;
  42
  43   get_frame_register (this_frame, I386_ESP_REGNUM, buf);
  44   sp = extract_unsigned_integer (buf, 4);
  45
  46   return read_memory_unsigned_integer (sp + 8, 4);
  47 }
  48 \f
  49
  50 /* Support for shared libraries.  */
  51
  52 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD).  */
  53
  54 /* From <machine/signal.h>.  */
  55 int i386bsd_sc_reg_offset[] =
  56 {
  57   -1,                           /* %eax */
  58   -1,                           /* %ecx */
  59   -1,                           /* %edx */
  60   -1,                           /* %ebx */
  61   8 + 0 * 4,                    /* %esp */
  62   8 + 1 * 4,                    /* %ebp */
  63   -1,                           /* %esi */
  64   -1,                           /* %edi */
  65   8 + 3 * 4,                    /* %eip */
  66   8 + 4 * 4,                    /* %eflags */
  67   -1,                           /* %cs */
  68   -1,                           /* %ss */
  69   -1,                           /* %ds */
  70   -1,                           /* %es */
  71   -1,                           /* %fs */
  72   -1                            /* %gs */
  73 };
  74
  75 void
  76 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  77 {
  78   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  79
  80   tdep->jb_pc_offset = 0;
  81
  82   tdep->sigtramp_start = 0xfdbfdfc0;
  83   tdep->sigtramp_end = 0xfdbfe000;
  84   tdep->sigcontext_addr = i386bsd_sigcontext_addr;
  85   tdep->sc_reg_offset = i386bsd_sc_reg_offset;
  86   tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset);
  87 }
  88
  89 \f
  90 static enum gdb_osabi
  91 i386bsd_aout_osabi_sniffer (bfd *abfd)
  92 {
  93   if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
  94     return GDB_OSABI_NETBSD_AOUT;
  95
  96   if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
  97     return GDB_OSABI_FREEBSD_AOUT;
  98
  99   return GDB_OSABI_UNKNOWN;
 100 }
 101
 102 static enum gdb_osabi
 103 i386bsd_core_osabi_sniffer (bfd *abfd)
 104 {
 105   if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
 106     return GDB_OSABI_NETBSD_AOUT;
 107
 108   return GDB_OSABI_UNKNOWN;
 109 }
 110
 111 \f
 112 /* Provide a prototype to silence -Wmissing-prototypes.  */
 113 void _initialize_i386bsd_tdep (void);
 114
 115 void
 116 _initialize_i386bsd_tdep (void)
 117 {
 118   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
 119                                   i386bsd_aout_osabi_sniffer);
 120
 121   /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
 122   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
 123                                   i386bsd_core_osabi_sniffer);
 124 }