| 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 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., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "osabi.h" |
| 26 | #include "regcache.h" |
| 27 | |
| 28 | #include "gdb_assert.h" |
| 29 | |
| 30 | #include "i386-tdep.h" |
| 31 | #include "i387-tdep.h" |
| 32 | #include "bsd-uthread.h" |
| 33 | #include "solib-svr4.h" |
| 34 | |
| 35 | /* FreeBSD 3.0-RELEASE or later. */ |
| 36 | |
| 37 | /* From <machine/reg.h>. */ |
| 38 | static int i386fbsd_r_reg_offset[] = |
| 39 | { |
| 40 | 9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */ |
| 41 | 15 * 4, 4 * 4, /* %esp, %ebp */ |
| 42 | 3 * 4, 2 * 4, /* %esi, %edi */ |
| 43 | 12 * 4, 14 * 4, /* %eip, %eflags */ |
| 44 | 13 * 4, 16 * 4, /* %cs, %ss */ |
| 45 | 1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */ |
| 46 | }; |
| 47 | |
| 48 | /* Sigtramp routine location. */ |
| 49 | CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20; |
| 50 | CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0; |
| 51 | |
| 52 | /* From <machine/signal.h>. */ |
| 53 | int i386fbsd_sc_reg_offset[] = |
| 54 | { |
| 55 | 8 + 14 * 4, /* %eax */ |
| 56 | 8 + 13 * 4, /* %ecx */ |
| 57 | 8 + 12 * 4, /* %edx */ |
| 58 | 8 + 11 * 4, /* %ebx */ |
| 59 | 8 + 0 * 4, /* %esp */ |
| 60 | 8 + 1 * 4, /* %ebp */ |
| 61 | 8 + 10 * 4, /* %esi */ |
| 62 | 8 + 9 * 4, /* %edi */ |
| 63 | 8 + 3 * 4, /* %eip */ |
| 64 | 8 + 4 * 4, /* %eflags */ |
| 65 | 8 + 7 * 4, /* %cs */ |
| 66 | 8 + 8 * 4, /* %ss */ |
| 67 | 8 + 6 * 4, /* %ds */ |
| 68 | 8 + 5 * 4, /* %es */ |
| 69 | 8 + 15 * 4, /* %fs */ |
| 70 | 8 + 16 * 4 /* %gs */ |
| 71 | }; |
| 72 | |
| 73 | /* From /usr/src/lib/libc/i386/gen/_setjmp.S. */ |
| 74 | static int i386fbsd_jmp_buf_reg_offset[] = |
| 75 | { |
| 76 | -1, /* %eax */ |
| 77 | -1, /* %ecx */ |
| 78 | -1, /* %edx */ |
| 79 | 1 * 4, /* %ebx */ |
| 80 | 2 * 4, /* %esp */ |
| 81 | 3 * 4, /* %ebp */ |
| 82 | 4 * 4, /* %esi */ |
| 83 | 5 * 4, /* %edi */ |
| 84 | 0 * 4 /* %eip */ |
| 85 | }; |
| 86 | |
| 87 | static void |
| 88 | i386fbsd_supply_uthread (struct regcache *regcache, |
| 89 | int regnum, CORE_ADDR addr) |
| 90 | { |
| 91 | char buf[4]; |
| 92 | int i; |
| 93 | |
| 94 | gdb_assert (regnum >= -1); |
| 95 | |
| 96 | for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++) |
| 97 | { |
| 98 | if (i386fbsd_jmp_buf_reg_offset[i] != -1 |
| 99 | && (regnum == -1 || regnum == i)) |
| 100 | { |
| 101 | read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4); |
| 102 | regcache_raw_supply (regcache, i, buf); |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | static void |
| 108 | i386fbsd_collect_uthread (const struct regcache *regcache, |
| 109 | int regnum, CORE_ADDR addr) |
| 110 | { |
| 111 | char buf[4]; |
| 112 | int i; |
| 113 | |
| 114 | gdb_assert (regnum >= -1); |
| 115 | |
| 116 | for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++) |
| 117 | { |
| 118 | if (i386fbsd_jmp_buf_reg_offset[i] != -1 |
| 119 | && (regnum == -1 || regnum == i)) |
| 120 | { |
| 121 | regcache_raw_collect (regcache, i, buf); |
| 122 | write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4); |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | static void |
| 128 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 129 | { |
| 130 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 131 | |
| 132 | /* Obviously FreeBSD is BSD-based. */ |
| 133 | i386bsd_init_abi (info, gdbarch); |
| 134 | |
| 135 | /* FreeBSD has a different `struct reg', and reserves some space for |
| 136 | its FPU emulator in `struct fpreg'. */ |
| 137 | tdep->gregset_reg_offset = i386fbsd_r_reg_offset; |
| 138 | tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset); |
| 139 | tdep->sizeof_gregset = 18 * 4; |
| 140 | tdep->sizeof_fpregset = 176; |
| 141 | |
| 142 | /* FreeBSD uses -freg-struct-return by default. */ |
| 143 | tdep->struct_return = reg_struct_return; |
| 144 | |
| 145 | /* FreeBSD uses a different memory layout. */ |
| 146 | tdep->sigtramp_start = i386fbsd_sigtramp_start_addr; |
| 147 | tdep->sigtramp_end = i386fbsd_sigtramp_end_addr; |
| 148 | |
| 149 | /* FreeBSD has a more complete `struct sigcontext'. */ |
| 150 | tdep->sc_reg_offset = i386fbsd_sc_reg_offset; |
| 151 | tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset); |
| 152 | |
| 153 | /* FreeBSD provides a user-level threads implementation. */ |
| 154 | bsd_uthread_set_supply_uthread (gdbarch, i386fbsd_supply_uthread); |
| 155 | bsd_uthread_set_collect_uthread (gdbarch, i386fbsd_collect_uthread); |
| 156 | } |
| 157 | |
| 158 | static void |
| 159 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 160 | { |
| 161 | /* It's almost identical to FreeBSD a.out. */ |
| 162 | i386fbsdaout_init_abi (info, gdbarch); |
| 163 | |
| 164 | /* Except that it uses ELF. */ |
| 165 | i386_elf_init_abi (info, gdbarch); |
| 166 | |
| 167 | /* FreeBSD ELF uses SVR4-style shared libraries. */ |
| 168 | set_solib_svr4_fetch_link_map_offsets |
| 169 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 170 | } |
| 171 | |
| 172 | /* FreeBSD 4.0-RELEASE or later. */ |
| 173 | |
| 174 | /* From <machine/reg.h>. */ |
| 175 | static int i386fbsd4_r_reg_offset[] = |
| 176 | { |
| 177 | 10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */ |
| 178 | 16 * 4, 5 * 4, /* %esp, %ebp */ |
| 179 | 4 * 4, 3 * 4, /* %esi, %edi */ |
| 180 | 13 * 4, 15 * 4, /* %eip, %eflags */ |
| 181 | 14 * 4, 17 * 4, /* %cs, %ss */ |
| 182 | 2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */ |
| 183 | }; |
| 184 | |
| 185 | /* From <machine/signal.h>. */ |
| 186 | int i386fbsd4_sc_reg_offset[] = |
| 187 | { |
| 188 | 20 + 11 * 4, /* %eax */ |
| 189 | 20 + 10 * 4, /* %ecx */ |
| 190 | 20 + 9 * 4, /* %edx */ |
| 191 | 20 + 8 * 4, /* %ebx */ |
| 192 | 20 + 17 * 4, /* %esp */ |
| 193 | 20 + 6 * 4, /* %ebp */ |
| 194 | 20 + 5 * 4, /* %esi */ |
| 195 | 20 + 4 * 4, /* %edi */ |
| 196 | 20 + 14 * 4, /* %eip */ |
| 197 | 20 + 16 * 4, /* %eflags */ |
| 198 | 20 + 15 * 4, /* %cs */ |
| 199 | 20 + 18 * 4, /* %ss */ |
| 200 | 20 + 3 * 4, /* %ds */ |
| 201 | 20 + 2 * 4, /* %es */ |
| 202 | 20 + 1 * 4, /* %fs */ |
| 203 | 20 + 0 * 4 /* %gs */ |
| 204 | }; |
| 205 | |
| 206 | static void |
| 207 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 208 | { |
| 209 | struct gdbarch_tdep *tdep = gdbarch_tdep (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 | } |