1 /* Target-dependent code for FreeBSD/i386. 2 3 Copyright (C) 2003-2013 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 gdb_byte 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 gdb_byte 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 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 /* Provide a prototype to silence -Wmissing-prototypes. */ 225 void _initialize_i386fbsd_tdep (void); 226 227 void 228 _initialize_i386fbsd_tdep (void) 229 { 230 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT, 231 i386fbsdaout_init_abi); 232 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF, 233 i386fbsd4_init_abi); 234 } 235