| 1 | /* Target-dependent code for FreeBSD/i386. |
| 2 | |
| 3 | Copyright 2003 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 | |
| 29 | /* FreeBSD 3.0-RELEASE or later. */ |
| 30 | |
| 31 | /* From <machine/reg.h>. */ |
| 32 | static int i386fbsd_r_reg_offset[] = |
| 33 | { |
| 34 | 9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */ |
| 35 | 15 * 4, 4 * 4, /* %esp, %ebp */ |
| 36 | 3 * 4, 2 * 4, /* %esi, %edi */ |
| 37 | 12 * 4, 14 * 4, /* %eip, %eflags */ |
| 38 | 13 * 4, 16 * 4, /* %cs, %ss */ |
| 39 | 1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */ |
| 40 | }; |
| 41 | |
| 42 | CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20; |
| 43 | CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0; |
| 44 | |
| 45 | /* From <machine/signal.h>. */ |
| 46 | static int i386fbsd_sc_reg_offset[] = |
| 47 | { |
| 48 | 8 + 14 * 4, /* %eax */ |
| 49 | 8 + 13 * 4, /* %ecx */ |
| 50 | 8 + 12 * 4, /* %edx */ |
| 51 | 8 + 11 * 4, /* %ebx */ |
| 52 | 8 + 0 * 4, /* %esp */ |
| 53 | 8 + 1 * 4, /* %ebp */ |
| 54 | 8 + 10 * 4, /* %esi */ |
| 55 | 8 + 9 * 4, /* %edi */ |
| 56 | 8 + 3 * 4, /* %eip */ |
| 57 | 8 + 4 * 4, /* %eflags */ |
| 58 | 8 + 7 * 4, /* %cs */ |
| 59 | 8 + 8 * 4, /* %ss */ |
| 60 | 8 + 6 * 4, /* %ds */ |
| 61 | 8 + 5 * 4, /* %es */ |
| 62 | 8 + 15 * 4, /* %fs */ |
| 63 | 8 + 16 * 4 /* %gs */ |
| 64 | }; |
| 65 | |
| 66 | static void |
| 67 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 68 | { |
| 69 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 70 | |
| 71 | /* Obviously FreeBSD is BSD-based. */ |
| 72 | i386bsd_init_abi (info, gdbarch); |
| 73 | |
| 74 | /* FreeBSD has a different `struct reg', and reserves some space for |
| 75 | its FPU emulator in `struct fpreg'. */ |
| 76 | tdep->gregset_reg_offset = i386fbsd_r_reg_offset; |
| 77 | tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd_r_reg_offset); |
| 78 | tdep->sizeof_gregset = 18 * 4; |
| 79 | tdep->sizeof_fpregset = 176; |
| 80 | |
| 81 | /* FreeBSD uses -freg-struct-return by default. */ |
| 82 | tdep->struct_return = reg_struct_return; |
| 83 | |
| 84 | /* FreeBSD uses a different memory layout. */ |
| 85 | tdep->sigtramp_start = i386fbsd_sigtramp_start; |
| 86 | tdep->sigtramp_end = i386fbsd_sigtramp_end; |
| 87 | |
| 88 | /* FreeBSD has a more complete `struct sigcontext'. */ |
| 89 | tdep->sc_reg_offset = i386fbsd_sc_reg_offset; |
| 90 | tdep->sc_num_regs = ARRAY_SIZE (i386fbsd_sc_reg_offset); |
| 91 | } |
| 92 | |
| 93 | static void |
| 94 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 95 | { |
| 96 | /* It's almost identical to FreeBSD a.out. */ |
| 97 | i386fbsdaout_init_abi (info, gdbarch); |
| 98 | |
| 99 | /* Except that it uses ELF. */ |
| 100 | i386_elf_init_abi (info, gdbarch); |
| 101 | |
| 102 | /* FreeBSD ELF uses SVR4-style shared libraries. */ |
| 103 | set_gdbarch_in_solib_call_trampoline (gdbarch, |
| 104 | generic_in_solib_call_trampoline); |
| 105 | } |
| 106 | |
| 107 | /* FreeBSD 4.0-RELEASE or later. */ |
| 108 | |
| 109 | /* From <machine/reg.h>. */ |
| 110 | static int i386fbsd4_r_reg_offset[] = |
| 111 | { |
| 112 | 10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */ |
| 113 | 16 * 4, 5 * 4, /* %esp, %ebp */ |
| 114 | 4 * 4, 3 * 4, /* %esi, %edi */ |
| 115 | 13 * 4, 15 * 4, /* %eip, %eflags */ |
| 116 | 14 * 4, 17 * 4, /* %cs, %ss */ |
| 117 | 2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */ |
| 118 | }; |
| 119 | |
| 120 | /* From <machine/signal.h>. */ |
| 121 | int i386fbsd4_sc_reg_offset[] = |
| 122 | { |
| 123 | 20 + 11 * 4, /* %eax */ |
| 124 | 20 + 10 * 4, /* %ecx */ |
| 125 | 20 + 9 * 4, /* %edx */ |
| 126 | 20 + 8 * 4, /* %ebx */ |
| 127 | 20 + 17 * 4, /* %esp */ |
| 128 | 20 + 6 * 4, /* %ebp */ |
| 129 | 20 + 5 * 4, /* %esi */ |
| 130 | 20 + 4 * 4, /* %edi */ |
| 131 | 20 + 14 * 4, /* %eip */ |
| 132 | 20 + 16 * 4, /* %eflags */ |
| 133 | 20 + 15 * 4, /* %cs */ |
| 134 | 20 + 18 * 4, /* %ss */ |
| 135 | 20 + 3 * 4, /* %ds */ |
| 136 | 20 + 2 * 4, /* %es */ |
| 137 | 20 + 1 * 4, /* %fs */ |
| 138 | 20 + 0 * 4 /* %gs */ |
| 139 | }; |
| 140 | |
| 141 | static void |
| 142 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 143 | { |
| 144 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 145 | |
| 146 | /* Inherit stuff from older releases. We assume that FreeBSD |
| 147 | 4.0-RELEASE always uses ELF. */ |
| 148 | i386fbsd_init_abi (info, gdbarch); |
| 149 | |
| 150 | /* FreeBSD 4.0 introduced a new `struct reg'. */ |
| 151 | tdep->gregset_reg_offset = i386fbsd4_r_reg_offset; |
| 152 | tdep->gregset_num_regs = ARRAY_SIZE (i386fbsd4_r_reg_offset); |
| 153 | tdep->sizeof_gregset = 19 * 4; |
| 154 | |
| 155 | /* FreeBSD 4.0 introduced a new `struct sigcontext'. */ |
| 156 | tdep->sc_reg_offset = i386fbsd4_sc_reg_offset; |
| 157 | tdep->sc_num_regs = ARRAY_SIZE (i386fbsd4_sc_reg_offset); |
| 158 | } |
| 159 | |
| 160 | \f |
| 161 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 162 | void _initialize_i386fbsd_tdep (void); |
| 163 | |
| 164 | void |
| 165 | _initialize_i386fbsd_tdep (void) |
| 166 | { |
| 167 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT, |
| 168 | i386fbsdaout_init_abi); |
| 169 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF, |
| 170 | i386fbsd4_init_abi); |
| 171 | } |