gdb/i386fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/i386.
   2
   3    Copyright 2003, 2004 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 "osabi.h"
  25
  26 #include "i386-tdep.h"
  27 #include "i387-tdep.h"
  28 #include "solib-svr4.h"
  29
  30 /* FreeBSD 3.0-RELEASE or later.  */
  31
  32 /* From <machine/reg.h>.  */
  33 static int i386fbsd_r_reg_offset[] =
  34 {
  35   9 * 4, 8 * 4, 7 * 4, 6 * 4,   /* %eax, %ecx, %edx, %ebx */
  36   15 * 4, 4 * 4,                /* %esp, %ebp */
  37   3 * 4, 2 * 4,                 /* %esi, %edi */
  38   12 * 4, 14 * 4,               /* %eip, %eflags */
  39   13 * 4, 16 * 4,               /* %cs, %ss */
  40   1 * 4, 0 * 4, -1, -1          /* %ds, %es, %fs, %gs */
  41 };
  42
  43 /* Sigtramp routine location.  */
  44 CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
  45 CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
  46
  47 /* From <machine/signal.h>.  */
  48 static int i386fbsd_sc_reg_offset[] =
  49 {
  50   8 + 14 * 4,                   /* %eax */
  51   8 + 13 * 4,                   /* %ecx */
  52   8 + 12 * 4,                   /* %edx */
  53   8 + 11 * 4,                   /* %ebx */
  54   8 + 0 * 4,                    /* %esp */
  55   8 + 1 * 4,                    /* %ebp */
  56   8 + 10 * 4,                   /* %esi */
  57   8 + 9 * 4,                    /* %edi */
  58   8 + 3 * 4,                    /* %eip */
  59   8 + 4 * 4,                    /* %eflags */
  60   8 + 7 * 4,                    /* %cs */
  61   8 + 8 * 4,                    /* %ss */
  62   8 + 6 * 4,                    /* %ds */
  63   8 + 5 * 4,                    /* %es */
  64   8 + 15 * 4,                   /* %fs */
  65   8 + 16 * 4                    /* %gs */
  66 };
  67
  68 static void
  69 i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  70 {
  71   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  72
  73   /* Obviously FreeBSD is BSD-based.  */
  74   i386bsd_init_abi (info, gdbarch);
  75
  76   /* FreeBSD has a different `struct reg', and reserves some space for
  77      its FPU emulator in `struct fpreg'.  */
  78   tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
  79   tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
  80   tdep->sizeof_gregset = 18 * 4;
  81   tdep->sizeof_fpregset = 176;
  82
  83   /* FreeBSD uses -freg-struct-return by default.  */
  84   tdep->struct_return = reg_struct_return;
  85
  86   /* FreeBSD uses a different memory layout.  */
  87   tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
  88   tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
  89
  90   /* FreeBSD has a more complete `struct sigcontext'.  */
  91   tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
  92   tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
  93 }
  94
  95 static void
  96 i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  97 {
  98   /* It's almost identical to FreeBSD a.out.  */
  99   i386fbsdaout_init_abi (info, gdbarch);
 100
 101   /* Except that it uses ELF.  */
 102   i386_elf_init_abi (info, gdbarch);
 103
 104   /* FreeBSD ELF uses SVR4-style shared libraries.  */
 105   set_gdbarch_in_solib_call_trampoline
 106     (gdbarch, generic_in_solib_call_trampoline);
 107   set_solib_svr4_fetch_link_map_offsets
 108     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 109 }
 110
 111 /* FreeBSD 4.0-RELEASE or later.  */
 112
 113 /* From <machine/reg.h>.  */
 114 static int i386fbsd4_r_reg_offset[] =
 115 {
 116   10 * 4, 9 * 4, 8 * 4, 7 * 4,  /* %eax, %ecx, %edx, %ebx */
 117   16 * 4, 5 * 4,                /* %esp, %ebp */
 118   4 * 4, 3 * 4,                 /* %esi, %edi */
 119   13 * 4, 15 * 4,               /* %eip, %eflags */
 120   14 * 4, 17 * 4,               /* %cs, %ss */
 121   2 * 4, 1 * 4, 0 * 4, 18 * 4   /* %ds, %es, %fs, %gs */
 122 };
 123
 124 /* From <machine/signal.h>.  */
 125 int i386fbsd4_sc_reg_offset[] =
 126 {
 127   20 + 11 * 4,                  /* %eax */
 128   20 + 10 * 4,                  /* %ecx */
 129   20 + 9 * 4,                   /* %edx */
 130   20 + 8 * 4,                   /* %ebx */
 131   20 + 17 * 4,                  /* %esp */
 132   20 + 6 * 4,                   /* %ebp */
 133   20 + 5 * 4,                   /* %esi */
 134   20 + 4 * 4,                   /* %edi */
 135   20 + 14 * 4,                  /* %eip */
 136   20 + 16 * 4,                  /* %eflags */
 137   20 + 15 * 4,                  /* %cs */
 138   20 + 18 * 4,                  /* %ss */
 139   20 + 3 * 4,                   /* %ds */
 140   20 + 2 * 4,                   /* %es */
 141   20 + 1 * 4,                   /* %fs */
 142   20 + 0 * 4                    /* %gs */
 143 };
 144
 145 static void
 146 i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 147 {
 148   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 149
 150   /* Inherit stuff from older releases.  We assume that FreeBSD
 151      4.0-RELEASE always uses ELF.  */
 152   i386fbsd_init_abi (info, gdbarch);
 153
 154   /* FreeBSD 4.0 introduced a new `struct reg'.  */
 155   tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
 156   tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
 157   tdep->sizeof_gregset = 19 * 4;
 158
 159   /* FreeBSD 4.0 introduced a new `struct sigcontext'.  */
 160   tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
 161   tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
 162 }
 163
 164 \f
 165 /* Provide a prototype to silence -Wmissing-prototypes.  */
 166 void _initialize_i386fbsd_tdep (void);
 167
 168 void
 169 _initialize_i386fbsd_tdep (void)
 170 {
 171   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
 172                           i386fbsdaout_init_abi);
 173   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
 174                           i386fbsd4_init_abi);
 175 }