1 /* Target-dependent code for FreeBSD/i386.
3 Copyright (C) 2003-2014 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 "i386-tdep.h"
27 #include "i387-tdep.h"
28 #include "bsd-uthread.h"
29 #include "fbsd-tdep.h"
30 #include "solib-svr4.h"
32 /* FreeBSD 3.0-RELEASE or later. */
34 /* From <machine/reg.h>. */
35 static int i386fbsd_r_reg_offset
[] =
37 9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */
38 15 * 4, 4 * 4, /* %esp, %ebp */
39 3 * 4, 2 * 4, /* %esi, %edi */
40 12 * 4, 14 * 4, /* %eip, %eflags */
41 13 * 4, 16 * 4, /* %cs, %ss */
42 1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */
45 /* Sigtramp routine location. */
46 CORE_ADDR i386fbsd_sigtramp_start_addr
= 0xbfbfdf20;
47 CORE_ADDR i386fbsd_sigtramp_end_addr
= 0xbfbfdff0;
49 /* From <machine/signal.h>. */
50 int i386fbsd_sc_reg_offset
[] =
52 8 + 14 * 4, /* %eax */
53 8 + 13 * 4, /* %ecx */
54 8 + 12 * 4, /* %edx */
55 8 + 11 * 4, /* %ebx */
58 8 + 10 * 4, /* %esi */
61 8 + 4 * 4, /* %eflags */
70 /* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
71 static int i386fbsd_jmp_buf_reg_offset
[] =
85 i386fbsd_supply_uthread (struct regcache
*regcache
,
86 int regnum
, CORE_ADDR addr
)
91 gdb_assert (regnum
>= -1);
93 for (i
= 0; i
< ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset
); i
++)
95 if (i386fbsd_jmp_buf_reg_offset
[i
] != -1
96 && (regnum
== -1 || regnum
== i
))
98 read_memory (addr
+ i386fbsd_jmp_buf_reg_offset
[i
], buf
, 4);
99 regcache_raw_supply (regcache
, i
, buf
);
105 i386fbsd_collect_uthread (const struct regcache
*regcache
,
106 int regnum
, CORE_ADDR addr
)
111 gdb_assert (regnum
>= -1);
113 for (i
= 0; i
< ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset
); i
++)
115 if (i386fbsd_jmp_buf_reg_offset
[i
] != -1
116 && (regnum
== -1 || regnum
== i
))
118 regcache_raw_collect (regcache
, i
, buf
);
119 write_memory (addr
+ i386fbsd_jmp_buf_reg_offset
[i
], buf
, 4);
125 i386fbsdaout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
127 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
129 /* Obviously FreeBSD is BSD-based. */
130 i386bsd_init_abi (info
, gdbarch
);
132 /* FreeBSD has a different `struct reg', and reserves some space for
133 its FPU emulator in `struct fpreg'. */
134 tdep
->gregset_reg_offset
= i386fbsd_r_reg_offset
;
135 tdep
->gregset_num_regs
= ARRAY_SIZE (i386fbsd_r_reg_offset
);
136 tdep
->sizeof_gregset
= 18 * 4;
137 tdep
->sizeof_fpregset
= 176;
139 /* FreeBSD uses -freg-struct-return by default. */
140 tdep
->struct_return
= reg_struct_return
;
142 /* FreeBSD uses a different memory layout. */
143 tdep
->sigtramp_start
= i386fbsd_sigtramp_start_addr
;
144 tdep
->sigtramp_end
= i386fbsd_sigtramp_end_addr
;
146 /* FreeBSD has a more complete `struct sigcontext'. */
147 tdep
->sc_reg_offset
= i386fbsd_sc_reg_offset
;
148 tdep
->sc_num_regs
= ARRAY_SIZE (i386fbsd_sc_reg_offset
);
150 /* FreeBSD provides a user-level threads implementation. */
151 bsd_uthread_set_supply_uthread (gdbarch
, i386fbsd_supply_uthread
);
152 bsd_uthread_set_collect_uthread (gdbarch
, i386fbsd_collect_uthread
);
156 i386fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
158 /* It's almost identical to FreeBSD a.out. */
159 i386fbsdaout_init_abi (info
, gdbarch
);
161 /* Except that it uses ELF. */
162 i386_elf_init_abi (info
, gdbarch
);
164 /* FreeBSD ELF uses SVR4-style shared libraries. */
165 set_solib_svr4_fetch_link_map_offsets
166 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
169 /* FreeBSD 4.0-RELEASE or later. */
171 /* From <machine/reg.h>. */
172 static int i386fbsd4_r_reg_offset
[] =
174 10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
175 16 * 4, 5 * 4, /* %esp, %ebp */
176 4 * 4, 3 * 4, /* %esi, %edi */
177 13 * 4, 15 * 4, /* %eip, %eflags */
178 14 * 4, 17 * 4, /* %cs, %ss */
179 2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
182 /* From <machine/signal.h>. */
183 int i386fbsd4_sc_reg_offset
[] =
185 20 + 11 * 4, /* %eax */
186 20 + 10 * 4, /* %ecx */
187 20 + 9 * 4, /* %edx */
188 20 + 8 * 4, /* %ebx */
189 20 + 17 * 4, /* %esp */
190 20 + 6 * 4, /* %ebp */
191 20 + 5 * 4, /* %esi */
192 20 + 4 * 4, /* %edi */
193 20 + 14 * 4, /* %eip */
194 20 + 16 * 4, /* %eflags */
195 20 + 15 * 4, /* %cs */
196 20 + 18 * 4, /* %ss */
197 20 + 3 * 4, /* %ds */
198 20 + 2 * 4, /* %es */
199 20 + 1 * 4, /* %fs */
204 i386fbsd4_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
206 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
208 /* Generic FreeBSD support. */
209 fbsd_init_abi (info
, gdbarch
);
211 /* Inherit stuff from older releases. We assume that FreeBSD
212 4.0-RELEASE always uses ELF. */
213 i386fbsd_init_abi (info
, gdbarch
);
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;
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
);
226 /* Provide a prototype to silence -Wmissing-prototypes. */
227 void _initialize_i386fbsd_tdep (void);
230 _initialize_i386fbsd_tdep (void)
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
,