gdb/i386obsd-tdep.c

   1 /* Target-dependent code for OpenBSD/i386.
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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 2 of the License, or
  10    (at your option) any later version.
  11
  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.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "arch-utils.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include "osabi.h"
  27
  28 #include "i386-tdep.h"
  29 #include "i387-tdep.h"
  30
  31 /* Provide a prototype to silence -Wmissing-prototypes.  */
  32 void _initialize_i386obsd_tdep (void);
  33
  34 #define SIZEOF_STRUCT_REG       (16 * 4)
  35
  36 static void
  37 i386obsd_supply_reg (char *regs, int regno)
  38 {
  39   int i;
  40
  41   for (i = 0; i <= 15; i++)
  42     if (regno == i || regno == -1)
  43       supply_register (i, regs + i * 4);
  44 }
  45
  46 static void
  47 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
  48                       CORE_ADDR ignore)
  49 {
  50   char *regs, *fsave;
  51
  52   /* We get everything from one section.  */
  53   if (which != 0)
  54     return;
  55
  56   if (core_reg_size < (SIZEOF_STRUCT_REG + 108))
  57     {
  58       warning ("Wrong size register set in core file.");
  59       return;
  60     }
  61
  62   regs = core_reg_sect;
  63   fsave = core_reg_sect + SIZEOF_STRUCT_REG;
  64
  65   /* Integer registers.  */
  66   i386obsd_supply_reg (regs, -1);
  67
  68   /* Floating point registers.  */
  69   i387_supply_fsave (fsave);
  70 }
  71
  72 static struct core_fns i386obsd_core_fns =
  73 {
  74   bfd_target_unknown_flavour,           /* core_flavour */
  75   default_check_format,                 /* check_format */
  76   default_core_sniffer,                 /* core_sniffer */
  77   fetch_core_registers,                 /* core_read_registers */
  78   NULL                                  /* next */
  79 };
  80 \f
  81
  82 CORE_ADDR i386obsd_sigtramp_start = 0xbfbfdf20;
  83 CORE_ADDR i386obsd_sigtramp_end = 0xbfbfdff0;
  84
  85 /* From <machine/signal.h>.  */
  86 int i386obsd_sc_pc_offset = 44;
  87 int i386obsd_sc_sp_offset = 56;
  88
  89 static void
  90 i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  91 {
  92   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  93
  94   /* Obviously OpenBSD is BSD-based.  */
  95   i386bsd_init_abi (info, gdbarch);
  96
  97   /* OpenBSD uses -freg-struct-return by default.  */
  98   tdep->struct_return = reg_struct_return;
  99
 100   /* OpenBSD uses a different memory layout.  */
 101   tdep->sigtramp_start = i386obsd_sigtramp_start;
 102   tdep->sigtramp_end = i386obsd_sigtramp_end;
 103
 104   /* OpenBSD has a `struct sigcontext' that's different from the
 105      origional 4.3 BSD.  */
 106   tdep->sc_pc_offset = i386obsd_sc_pc_offset;
 107   tdep->sc_sp_offset = i386obsd_sc_sp_offset;
 108 }
 109
 110 void
 111 _initialize_i386obsd_tdep (void)
 112 {
 113   add_core_fns (&i386obsd_core_fns);
 114
 115   /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are
 116      indistingushable from NetBSD/i386 a.out binaries, building a GDB
 117      that should support both these targets will probably not work as
 118      expected.  */
 119 #define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT
 120
 121   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_AOUT,
 122                           i386obsd_init_abi);
 123 }