gdb/i386obsd-tdep.c

   1 /* Target-dependent code for OpenBSD/i386.
   2
   3    Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003
   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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "arch-utils.h"
  25 #include "gdbcore.h"
  26 #include "regcache.h"
  27 #include "regset.h"
  28 #include "osabi.h"
  29
  30 #include "gdb_assert.h"
  31 #include "gdb_string.h"
  32
  33 #include "i386-tdep.h"
  34 #include "i387-tdep.h"
  35
  36 /* From <machine/reg.h>.  */
  37 static int i386obsd_r_reg_offset[] =
  38 {
  39   0 * 4,                        /* %eax */
  40   1 * 4,                        /* %ecx */
  41   2 * 4,                        /* %edx */
  42   3 * 4,                        /* %ebx */
  43   4 * 4,                        /* %esp */
  44   5 * 4,                        /* %ebp */
  45   6 * 4,                        /* %esi */
  46   7 * 4,                        /* %edi */
  47   8 * 4,                        /* %eip */
  48   9 * 4,                        /* %eflags */
  49   10 * 4,                       /* %cs */
  50   11 * 4,                       /* %ss */
  51   12 * 4,                       /* %ds */
  52   13 * 4,                       /* %es */
  53   14 * 4,                       /* %fs */
  54   15 * 4                        /* %gs */
  55 };
  56
  57 static void
  58 i386obsd_aout_supply_regset (const struct regset *regset,
  59                              struct regcache *regcache, int regnum,
  60                              const void *regs, size_t len)
  61 {
  62   const struct gdbarch_tdep *tdep = regset->descr;
  63
  64   gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
  65
  66   i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
  67   i387_supply_fsave (regcache, regnum, (char *) regs + tdep->sizeof_gregset);
  68 }
  69
  70 static const struct regset *
  71 i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
  72                                         const char *sect_name,
  73                                         size_t sect_size)
  74 {
  75   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  76
  77   /* OpenBSD a.out core dumps don't use seperate register sets for the
  78      general-purpose and floating-point registers.  */
  79
  80   if (strcmp (sect_name, ".reg") == 0
  81       && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
  82     {
  83       if (tdep->gregset == NULL)
  84         {
  85           tdep->gregset = XMALLOC (struct regset);
  86           tdep->gregset->descr = tdep;
  87           tdep->gregset->supply_regset = i386obsd_aout_supply_regset;
  88         }
  89       return tdep->gregset;
  90     }
  91
  92   return NULL;
  93 }
  94 \f
  95
  96 CORE_ADDR i386obsd_sigtramp_start = 0xbfbfdf20;
  97 CORE_ADDR i386obsd_sigtramp_end = 0xbfbfdff0;
  98
  99 /* From <machine/signal.h>.  */
 100 int i386obsd_sc_reg_offset[I386_NUM_GREGS] =
 101 {
 102   10 * 4,                       /* %eax */
 103   9 * 4,                        /* %ecx */
 104   8 * 4,                        /* %edx */
 105   7 * 4,                        /* %ebx */
 106   14 * 4,                       /* %esp */
 107   6 * 4,                        /* %ebp */
 108   5 * 4,                        /* %esi */
 109   4 * 4,                        /* %edi */
 110   11 * 4,                       /* %eip */
 111   13 * 4,                       /* %eflags */
 112   12 * 4,                       /* %cs */
 113   15 * 4,                       /* %ss */
 114   3 * 4,                        /* %ds */
 115   2 * 4,                        /* %es */
 116   1 * 4,                        /* %fs */
 117   0 * 4                         /* %gs */
 118 };
 119
 120 static void
 121 i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 122 {
 123   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 124
 125   /* Obviously OpenBSD is BSD-based.  */
 126   i386bsd_init_abi (info, gdbarch);
 127
 128   /* OpenBSD has a different `struct reg'.  */
 129   tdep->gregset_reg_offset = i386obsd_r_reg_offset;
 130   tdep->gregset_num_regs = ARRAY_SIZE (i386obsd_r_reg_offset);
 131   tdep->sizeof_gregset = 16 * 4;
 132
 133   /* OpenBSD has a single register set.  */
 134   set_gdbarch_regset_from_core_section
 135     (gdbarch, i386obsd_aout_regset_from_core_section);
 136
 137   /* OpenBSD uses -freg-struct-return by default.  */
 138   tdep->struct_return = reg_struct_return;
 139
 140   /* OpenBSD uses a different memory layout.  */
 141   tdep->sigtramp_start = i386obsd_sigtramp_start;
 142   tdep->sigtramp_end = i386obsd_sigtramp_end;
 143
 144   /* OpenBSD has a `struct sigcontext' that's different from the
 145      origional 4.3 BSD.  */
 146   tdep->sc_reg_offset = i386obsd_sc_reg_offset;
 147   tdep->sc_num_regs = ARRAY_SIZE (i386obsd_sc_reg_offset);
 148 }
 149 \f
 150
 151 /* Provide a prototype to silence -Wmissing-prototypes.  */
 152 void _initialize_i386obsd_tdep (void);
 153
 154 void
 155 _initialize_i386obsd_tdep (void)
 156 {
 157   /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are
 158      indistingushable from NetBSD/i386 a.out binaries, building a GDB
 159      that should support both these targets will probably not work as
 160      expected.  */
 161 #define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT
 162
 163   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_AOUT,
 164                           i386obsd_init_abi);
 165 }