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 } 163 164 165 /* 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 } 176