1 /* Target-dependent code for FreeBSD/i386.
3 Copyright (C) 2003-2005, 2007-2012 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
21 #include "arch-utils.h"
26 #include "gdb_assert.h"
28 #include "i386-tdep.h"
29 #include "i387-tdep.h"
30 #include "bsd-uthread.h"
31 #include "solib-svr4.h"
33 /* FreeBSD 3.0-RELEASE or later. */
35 /* From <machine/reg.h>. */
36 static int i386fbsd_r_reg_offset[] =
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 */
46 /* Sigtramp routine location. */
47 CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20;
48 CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0;
50 /* From <machine/signal.h>. */
51 int i386fbsd_sc_reg_offset[] =
53 8 + 14 * 4, /* %eax */
54 8 + 13 * 4, /* %ecx */
55 8 + 12 * 4, /* %edx */
56 8 + 11 * 4, /* %ebx */
59 8 + 10 * 4, /* %esi */
62 8 + 4 * 4, /* %eflags */
71 /* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
72 static int i386fbsd_jmp_buf_reg_offset[] =
86 i386fbsd_supply_uthread (struct regcache *regcache,
87 int regnum, CORE_ADDR addr)
92 gdb_assert (regnum >= -1);
94 for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
96 if (i386fbsd_jmp_buf_reg_offset[i] != -1
97 && (regnum == -1 || regnum == i))
99 read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
100 regcache_raw_supply (regcache, i, buf);
106 i386fbsd_collect_uthread (const struct regcache *regcache,
107 int regnum, CORE_ADDR addr)
112 gdb_assert (regnum >= -1);
114 for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++)
116 if (i386fbsd_jmp_buf_reg_offset[i] != -1
117 && (regnum == -1 || regnum == i))
119 regcache_raw_collect (regcache, i, buf);
120 write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4);
126 i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
128 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
130 /* Obviously FreeBSD is BSD-based. */
131 i386bsd_init_abi (info, gdbarch);
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;
140 /* FreeBSD uses -freg-struct-return by default. */
141 tdep->struct_return = reg_struct_return;
143 /* FreeBSD uses a different memory layout. */
144 tdep->sigtramp_start = i386fbsd_sigtramp_start_addr;
145 tdep->sigtramp_end = i386fbsd_sigtramp_end_addr;
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);
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);
157 i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
159 /* It's almost identical to FreeBSD a.out. */
160 i386fbsdaout_init_abi (info, gdbarch);
162 /* Except that it uses ELF. */
163 i386_elf_init_abi (info, gdbarch);
165 /* FreeBSD ELF uses SVR4-style shared libraries. */
166 set_solib_svr4_fetch_link_map_offsets
167 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
170 /* FreeBSD 4.0-RELEASE or later. */
172 /* From <machine/reg.h>. */
173 static int i386fbsd4_r_reg_offset[] =
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 */
183 /* From <machine/signal.h>. */
184 int i386fbsd4_sc_reg_offset[] =
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 */
205 i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
207 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
209 /* Inherit stuff from older releases. We assume that FreeBSD
210 4.0-RELEASE always uses ELF. */
211 i386fbsd_init_abi (info, gdbarch);
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;
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);
224 /* Provide a prototype to silence -Wmissing-prototypes. */
225 void _initialize_i386fbsd_tdep (void);
228 _initialize_i386fbsd_tdep (void)
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,