gdb/i386fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/i386.
   2
   3    Copyright (C) 2003-2014 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 "i386-tdep.h"
  27 #include "i387-tdep.h"
  28 #include "bsd-uthread.h"
  29 #include "fbsd-tdep.h"
  30 #include "solib-svr4.h"
  31
  32 /* FreeBSD 3.0-RELEASE or later.  */
  33
  34 /* From <machine/reg.h>.  */
  35 static int i386fbsd_r_reg_offset[] =
  36 {
  37   9 * 4, 8 * 4, 7 * 4, 6 * 4,   /* %eax, %ecx, %edx, %ebx */
  38   15 * 4, 4 * 4,                /* %esp, %ebp */
  39   3 * 4, 2 * 4,                 /* %esi, %edi */
  40   12 * 4, 14 * 4,               /* %eip, %eflags */
  41   13 * 4, 16 * 4,               /* %cs, %ss */
  42   1 * 4, 0 * 4, -1, -1          /* %ds, %es, %fs, %gs */
  43 };
  44
  45 /* Sigtramp routine location.  */
  46 CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
  47 CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
  48
  49 /* From <machine/signal.h>.  */
  50 int i386fbsd_sc_reg_offset[] =
  51 {
  52   8 + 14 * 4,                   /* %eax */
  53   8 + 13 * 4,                   /* %ecx */
  54   8 + 12 * 4,                   /* %edx */
  55   8 + 11 * 4,                   /* %ebx */
  56   8 + 0 * 4,                    /* %esp */
  57   8 + 1 * 4,                    /* %ebp */
  58   8 + 10 * 4,                   /* %esi */
  59   8 + 9 * 4,                    /* %edi */
  60   8 + 3 * 4,                    /* %eip */
  61   8 + 4 * 4,                    /* %eflags */
  62   8 + 7 * 4,                    /* %cs */
  63   8 + 8 * 4,                    /* %ss */
  64   8 + 6 * 4,                    /* %ds */
  65   8 + 5 * 4,                    /* %es */
  66   8 + 15 * 4,                   /* %fs */
  67   8 + 16 * 4                    /* %gs */
  68 };
  69
  70 /* From /usr/src/lib/libc/i386/gen/_setjmp.S.  */
  71 static int i386fbsd_jmp_buf_reg_offset[] =
  72 {
  73   -1,                           /* %eax */
  74   -1,                           /* %ecx */
  75   -1,                           /* %edx */
  76   1 * 4,                        /* %ebx */
  77   2 * 4,                        /* %esp */
  78   3 * 4,                        /* %ebp */
  79   4 * 4,                        /* %esi */
  80   5 * 4,                        /* %edi */
  81   0 * 4                         /* %eip */
  82 };
  83
  84 static void
  85 i386fbsd_supply_uthread (struct regcache *regcache,
  86                          int regnum, CORE_ADDR addr)
  87 {
  88   gdb_byte buf[4];
  89   int i;
  90
  91   gdb_assert (regnum >= -1);
  92
  93   for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
  94     {
  95       if (i386fbsd_jmp_buf_reg_offset[i] != -1
  96           && (regnum == -1 || regnum == i))
  97         {
  98           read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
  99           regcache_raw_supply (regcache, i, buf);
 100         }
 101     }
 102 }
 103
 104 static void
 105 i386fbsd_collect_uthread (const struct regcache *regcache,
 106                           int regnum, CORE_ADDR addr)
 107 {
 108   gdb_byte buf[4];
 109   int i;
 110
 111   gdb_assert (regnum >= -1);
 112
 113   for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
 114     {
 115       if (i386fbsd_jmp_buf_reg_offset[i] != -1
 116           && (regnum == -1 || regnum == i))
 117         {
 118           regcache_raw_collect (regcache, i, buf);
 119           write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
 120         }
 121     }
 122 }
 123
 124 static void
 125 i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 126 {
 127   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 128
 129   /* Obviously FreeBSD is BSD-based.  */
 130   i386bsd_init_abi (info, gdbarch);
 131
 132   /* FreeBSD has a different `struct reg', and reserves some space for
 133      its FPU emulator in `struct fpreg'.  */
 134   tdep->gregset_reg_offset = i386fbsd_r_reg_offset;
 135   tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset);
 136   tdep->sizeof_gregset = 18 * 4;
 137   tdep->sizeof_fpregset = 176;
 138
 139   /* FreeBSD uses -freg-struct-return by default.  */
 140   tdep->struct_return = reg_struct_return;
 141
 142   /* FreeBSD uses a different memory layout.  */
 143   tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
 144   tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
 145
 146   /* FreeBSD has a more complete `struct sigcontext'.  */
 147   tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
 148   tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset);
 149
 150   /* FreeBSD provides a user-level threads implementation.  */
 151   bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread);
 152   bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread);
 153 }
 154
 155 static void
 156 i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 157 {
 158   /* It's almost identical to FreeBSD a.out.  */
 159   i386fbsdaout_init_abi (info, gdbarch);
 160
 161   /* Except that it uses ELF.  */
 162   i386_elf_init_abi (info, gdbarch);
 163
 164   /* FreeBSD ELF uses SVR4-style shared libraries.  */
 165   set_solib_svr4_fetch_link_map_offsets
 166     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 167 }
 168
 169 /* FreeBSD 4.0-RELEASE or later.  */
 170
 171 /* From <machine/reg.h>.  */
 172 static int i386fbsd4_r_reg_offset[] =
 173 {
 174   10 * 4, 9 * 4, 8 * 4, 7 * 4,  /* %eax, %ecx, %edx, %ebx */
 175   16 * 4, 5 * 4,                /* %esp, %ebp */
 176   4 * 4, 3 * 4,                 /* %esi, %edi */
 177   13 * 4, 15 * 4,               /* %eip, %eflags */
 178   14 * 4, 17 * 4,               /* %cs, %ss */
 179   2 * 4, 1 * 4, 0 * 4, 18 * 4   /* %ds, %es, %fs, %gs */
 180 };
 181
 182 /* From <machine/signal.h>.  */
 183 int i386fbsd4_sc_reg_offset[] =
 184 {
 185   20 + 11 * 4,                  /* %eax */
 186   20 + 10 * 4,                  /* %ecx */
 187   20 + 9 * 4,                   /* %edx */
 188   20 + 8 * 4,                   /* %ebx */
 189   20 + 17 * 4,                  /* %esp */
 190   20 + 6 * 4,                   /* %ebp */
 191   20 + 5 * 4,                   /* %esi */
 192   20 + 4 * 4,                   /* %edi */
 193   20 + 14 * 4,                  /* %eip */
 194   20 + 16 * 4,                  /* %eflags */
 195   20 + 15 * 4,                  /* %cs */
 196   20 + 18 * 4,                  /* %ss */
 197   20 + 3 * 4,                   /* %ds */
 198   20 + 2 * 4,                   /* %es */
 199   20 + 1 * 4,                   /* %fs */
 200   20 + 0 * 4                    /* %gs */
 201 };
 202
 203 static void
 204 i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 205 {
 206   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 207
 208   /* Generic FreeBSD support. */
 209   fbsd_init_abi (info, gdbarch);
 210
 211   /* Inherit stuff from older releases.  We assume that FreeBSD
 212      4.0-RELEASE always uses ELF.  */
 213   i386fbsd_init_abi (info, gdbarch);
 214
 215   /* FreeBSD 4.0 introduced a new `struct reg'.  */
 216   tdep->gregset_reg_offset = i386fbsd4_r_reg_offset;
 217   tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset);
 218   tdep->sizeof_gregset = 19 * 4;
 219
 220   /* FreeBSD 4.0 introduced a new `struct sigcontext'.  */
 221   tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
 222   tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset);
 223 }
 224
 225 \f
 226 /* Provide a prototype to silence -Wmissing-prototypes.  */
 227 void _initialize_i386fbsd_tdep (void);
 228
 229 void
 230 _initialize_i386fbsd_tdep (void)
 231 {
 232   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
 233                           i386fbsdaout_init_abi);
 234   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
 235                           i386fbsd4_init_abi);
 236 }