contrib/gdb-6/gdb/i386fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/i386.
   2
   3    Copyright (C) 2003, 2004, 2005, 2007 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "arch-utils.h"
  22 #include "gdbcore.h"
  23 #include "osabi.h"
  24 #include "regcache.h"
  25
  26 #include "gdb_assert.h"
  27
  28 #include "i386-tdep.h"
  29 #include "i387-tdep.h"
  30 #include "bsd-uthread.h"
  31 #include "solib-svr4.h"
  32
  33 /* FreeBSD 3.0-RELEASE or later.  */
  34
  35 /* From <machine/reg.h>.  */
  36 static int i386fbsd_r_reg_offset[] =
  37 {
  38   9 * 4, 8 * 4, 7 * 4, 6 * 4,   /* %eax, %ecx, %edx, %ebx */
  39   15 * 4, 4 * 4,                /* %esp, %ebp */
  40   3 * 4, 2 * 4,                 /* %esi, %edi */
  41   12 * 4, 14 * 4,               /* %eip, %eflags */
  42   13 * 4, 16 * 4,               /* %cs, %ss */
  43   1 * 4, 0 * 4, -1, -1          /* %ds, %es, %fs, %gs */
  44 };
  45
  46 /* Sigtramp routine location.  */
  47 CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
  48 CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
  49
  50 /* From <machine/signal.h>.  */
  51 int i386fbsd_sc_reg_offset[] =
  52 {
  53   8 + 14 * 4,                   /* %eax */
  54   8 + 13 * 4,                   /* %ecx */
  55   8 + 12 * 4,                   /* %edx */
  56   8 + 11 * 4,                   /* %ebx */
  57   8 + 0 * 4,                    /* %esp */
  58   8 + 1 * 4,                    /* %ebp */
  59   8 + 10 * 4,                   /* %esi */
  60   8 + 9 * 4,                    /* %edi */
  61   8 + 3 * 4,                    /* %eip */
  62   8 + 4 * 4,                    /* %eflags */
  63   8 + 7 * 4,                    /* %cs */
  64   8 + 8 * 4,                    /* %ss */
  65   8 + 6 * 4,                    /* %ds */
  66   8 + 5 * 4,                    /* %es */
  67   8 + 15 * 4,                   /* %fs */
  68   8 + 16 * 4                    /* %gs */
  69 };
  70
  71 /* From /usr/src/lib/libc/i386/gen/_setjmp.S.  */
  72 static int i386fbsd_jmp_buf_reg_offset[] =
  73 {
  74   -1,                           /* %eax */
  75   -1,                           /* %ecx */
  76   -1,                           /* %edx */
  77   1 * 4,                        /* %ebx */
  78   2 * 4,                        /* %esp */
  79   3 * 4,                        /* %ebp */
  80   4 * 4,                        /* %esi */
  81   5 * 4,                        /* %edi */
  82   0 * 4                         /* %eip */
  83 };
  84
  85 static void
  86 i386fbsd_supply_uthread (struct regcache *regcache,
  87                          int regnum, CORE_ADDR addr)
  88 {
  89   char buf[4];
  90   int i;
  91
  92   gdb_assert (regnum >= -1);
  93
  94   for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
  95     {
  96       if (i386fbsd_jmp_buf_reg_offset[i] != -1
  97           && (regnum == -1 || regnum == i))
  98         {
  99           read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
 100           regcache_raw_supply (regcache, i, buf);
 101         }
 102     }
 103 }
 104
 105 static void
 106 i386fbsd_collect_uthread (const struct regcache *regcache,
 107                           int regnum, CORE_ADDR addr)
 108 {
 109   char buf[4];
 110   int i;
 111
 112   gdb_assert (regnum >= -1);
 113
 114   for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
 115     {
 116       if (i386fbsd_jmp_buf_reg_offset[i] != -1
 117           && (regnum == -1 || regnum == i))
 118         {
 119           regcache_raw_collect (regcache, i, buf);
 120           write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
 121         }
 122     }
 123 }
 124
 125 static void
 126 i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 127 {
 128   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 129
 130   /* Obviously FreeBSD is BSD-based.  */
 131   i386bsd_init_abi (info, gdbarch);
 132
 133   /* FreeBSD has a different `struct reg', and reserves some space for
 134      its FPU emulator in `struct fpreg'.  */
 135   tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
 136   tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
 137   tdep->sizeof_gregset = 18 * 4;
 138   tdep->sizeof_fpregset = 176;
 139
 140   /* FreeBSD uses -freg-struct-return by default.  */
 141   tdep->struct_return = reg_struct_return;
 142
 143   /* FreeBSD uses a different memory layout.  */
 144   tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
 145   tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
 146
 147   /* FreeBSD has a more complete `struct sigcontext'.  */
 148   tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
 149   tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
 150
 151   /* FreeBSD provides a user-level threads implementation.  */
 152   bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
 153   bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
 154 }
 155
 156 static void
 157 i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 158 {
 159   /* It's almost identical to FreeBSD a.out.  */
 160   i386fbsdaout_init_abi (info, gdbarch);
 161
 162   /* Except that it uses ELF.  */
 163   i386_elf_init_abi (info, gdbarch);
 164
 165   /* FreeBSD ELF uses SVR4-style shared libraries.  */
 166   set_solib_svr4_fetch_link_map_offsets
 167     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 168 }
 169
 170 /* FreeBSD 4.0-RELEASE or later.  */
 171
 172 /* From <machine/reg.h>.  */
 173 static int i386fbsd4_r_reg_offset[] =
 174 {
 175   10 * 4, 9 * 4, 8 * 4, 7 * 4,  /* %eax, %ecx, %edx, %ebx */
 176   16 * 4, 5 * 4,                /* %esp, %ebp */
 177   4 * 4, 3 * 4,                 /* %esi, %edi */
 178   13 * 4, 15 * 4,               /* %eip, %eflags */
 179   14 * 4, 17 * 4,               /* %cs, %ss */
 180   2 * 4, 1 * 4, 0 * 4, 18 * 4   /* %ds, %es, %fs, %gs */
 181 };
 182
 183 /* From <machine/signal.h>.  */
 184 int i386fbsd4_sc_reg_offset[] =
 185 {
 186   20 + 11 * 4,                  /* %eax */
 187   20 + 10 * 4,                  /* %ecx */
 188   20 + 9 * 4,                   /* %edx */
 189   20 + 8 * 4,                   /* %ebx */
 190   20 + 17 * 4,                  /* %esp */
 191   20 + 6 * 4,                   /* %ebp */
 192   20 + 5 * 4,                   /* %esi */
 193   20 + 4 * 4,                   /* %edi */
 194   20 + 14 * 4,                  /* %eip */
 195   20 + 16 * 4,                  /* %eflags */
 196   20 + 15 * 4,                  /* %cs */
 197   20 + 18 * 4,                  /* %ss */
 198   20 + 3 * 4,                   /* %ds */
 199   20 + 2 * 4,                   /* %es */
 200   20 + 1 * 4,                   /* %fs */
 201   20 + 0 * 4                    /* %gs */
 202 };
 203
 204 static void
 205 i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 206 {
 207   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 208
 209   /* Inherit stuff from older releases.  We assume that FreeBSD
 210      4.0-RELEASE always uses ELF.  */
 211   i386fbsd_init_abi (info, gdbarch);
 212
 213   /* FreeBSD 4.0 introduced a new `struct reg'.  */
 214   tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
 215   tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
 216   tdep->sizeof_gregset = 19 * 4;
 217
 218   /* FreeBSD 4.0 introduced a new `struct sigcontext'.  */
 219   tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
 220   tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
 221 }
 222
 223 /*
 224  * Okay, I know this is blunt and shouldn't be in tdep,
 225  * but in the long run we'll save quite some hassle with this.
 226  */
 227
 228 #include <machine/reg.h>
 229 static int i386dragonfly_r_reg_offset[] =
 230 {
 231 #define REGO(r) (offsetof(struct reg, r_ ## r))
 232   REGO(eax),
 233   REGO(ecx),
 234   REGO(edx),
 235   REGO(ebx),
 236   REGO(esp),
 237   REGO(ebp),
 238   REGO(esi),
 239   REGO(edi),
 240   REGO(eip),
 241   REGO(eflags),
 242   REGO(cs),
 243   REGO(ss),
 244   REGO(ds),
 245   REGO(es),
 246   REGO(fs),
 247   REGO(gs)
 248 #undef REGO
 249 };
 250
 251 #include <machine/signal.h>
 252 int i386dragonfly_sc_reg_offset[] =
 253 {
 254 #define SCRO(r) (offsetof(struct sigcontext, sc_ ## r))
 255   SCRO(eax),
 256   SCRO(ecx),
 257   SCRO(edx),
 258   SCRO(ebx),
 259   SCRO(esp),
 260   SCRO(ebp),
 261   SCRO(esi),
 262   SCRO(edi),
 263   SCRO(eip),
 264   SCRO(eflags),
 265   SCRO(cs),
 266   SCRO(ss),
 267   SCRO(ds),
 268   SCRO(es),
 269   SCRO(fs),
 270   SCRO(gs)
 271 #undef SCRO
 272 };
 273
 274 static void
 275 i386dragonfly_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 276 {
 277   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 278
 279   i386fbsd4_init_abi(info, gdbarch);
 280
 281   tdep->gregset_reg_offset = i386dragonfly_r_reg_offset;
 282   tdep->gregset_num_regs = ARRAY_SIZE (i386dragonfly_r_reg_offset);
 283   tdep->sizeof_gregset = sizeof(struct reg);
 284
 285   tdep->sc_reg_offset = i386dragonfly_sc_reg_offset;
 286   tdep->sc_num_regs = ARRAY_SIZE (i386dragonfly_sc_reg_offset);
 287 }
 288
 289 \f
 290 /* Provide a prototype to silence -Wmissing-prototypes.  */
 291 void _initialize_i386fbsd_tdep (void);
 292
 293 void
 294 _initialize_i386fbsd_tdep (void)
 295 {
 296   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
 297                           i386fbsdaout_init_abi);
 298   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
 299                           i386fbsd4_init_abi);
 300   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_DRAGONFLY_ELF,
 301                           i386dragonfly_init_abi);
 302 }