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 "solib-svr4.h"
31 /* FreeBSD 3.0-RELEASE or later. */
33 /* From <machine/reg.h>. */
34 static int i386fbsd_r_reg_offset
[] =
36 9 * 4, 8 * 4, 7 * 4, 6 * 4, /* %eax, %ecx, %edx, %ebx */
37 15 * 4, 4 * 4, /* %esp, %ebp */
38 3 * 4, 2 * 4, /* %esi, %edi */
39 12 * 4, 14 * 4, /* %eip, %eflags */
40 13 * 4, 16 * 4, /* %cs, %ss */
41 1 * 4, 0 * 4, -1, -1 /* %ds, %es, %fs, %gs */
44 /* Sigtramp routine location. */
45 CORE_ADDR i386fbsd_sigtramp_start_addr
= 0xbfbfdf20;
46 CORE_ADDR i386fbsd_sigtramp_end_addr
= 0xbfbfdff0;
48 /* From <machine/signal.h>. */
49 int i386fbsd_sc_reg_offset
[] =
51 8 + 14 * 4, /* %eax */
52 8 + 13 * 4, /* %ecx */
53 8 + 12 * 4, /* %edx */
54 8 + 11 * 4, /* %ebx */
57 8 + 10 * 4, /* %esi */
60 8 + 4 * 4, /* %eflags */
69 /* From /usr/src/lib/libc/i386/gen/_setjmp.S. */
70 static int i386fbsd_jmp_buf_reg_offset
[] =
84 i386fbsd_supply_uthread (struct regcache
*regcache
,
85 int regnum
, CORE_ADDR addr
)
90 gdb_assert (regnum
>= -1);
92 for (i
= 0; i
< ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset
); i
++)
94 if (i386fbsd_jmp_buf_reg_offset
[i
] != -1
95 && (regnum
== -1 || regnum
== i
))
97 read_memory (addr
+ i386fbsd_jmp_buf_reg_offset
[i
], buf
, 4);
98 regcache_raw_supply (regcache
, i
, buf
);
104 i386fbsd_collect_uthread (const struct regcache
*regcache
,
105 int regnum
, CORE_ADDR addr
)
110 gdb_assert (regnum
>= -1);
112 for (i
= 0; i
< ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset
); i
++)
114 if (i386fbsd_jmp_buf_reg_offset
[i
] != -1
115 && (regnum
== -1 || regnum
== i
))
117 regcache_raw_collect (regcache
, i
, buf
);
118 write_memory (addr
+ i386fbsd_jmp_buf_reg_offset
[i
], buf
, 4);
124 i386fbsdaout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
126 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
128 /* Obviously FreeBSD is BSD-based. */
129 i386bsd_init_abi (info
, gdbarch
);
131 /* FreeBSD has a different `struct reg', and reserves some space for
132 its FPU emulator in `struct fpreg'. */
133 tdep
->gregset_reg_offset
= i386fbsd_r_reg_offset
;
134 tdep
->gregset_num_regs
= ARRAY_SIZE (i386fbsd_r_reg_offset
);
135 tdep
->sizeof_gregset
= 18 * 4;
136 tdep
->sizeof_fpregset
= 176;
138 /* FreeBSD uses -freg-struct-return by default. */
139 tdep
->struct_return
= reg_struct_return
;
141 /* FreeBSD uses a different memory layout. */
142 tdep
->sigtramp_start
= i386fbsd_sigtramp_start_addr
;
143 tdep
->sigtramp_end
= i386fbsd_sigtramp_end_addr
;
145 /* FreeBSD has a more complete `struct sigcontext'. */
146 tdep
->sc_reg_offset
= i386fbsd_sc_reg_offset
;
147 tdep
->sc_num_regs
= ARRAY_SIZE (i386fbsd_sc_reg_offset
);
149 /* FreeBSD provides a user-level threads implementation. */
150 bsd_uthread_set_supply_uthread (gdbarch
, i386fbsd_supply_uthread
);
151 bsd_uthread_set_collect_uthread (gdbarch
, i386fbsd_collect_uthread
);
155 i386fbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
157 /* It's almost identical to FreeBSD a.out. */
158 i386fbsdaout_init_abi (info
, gdbarch
);
160 /* Except that it uses ELF. */
161 i386_elf_init_abi (info
, gdbarch
);
163 /* FreeBSD ELF uses SVR4-style shared libraries. */
164 set_solib_svr4_fetch_link_map_offsets
165 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
168 /* FreeBSD 4.0-RELEASE or later. */
170 /* From <machine/reg.h>. */
171 static int i386fbsd4_r_reg_offset
[] =
173 10 * 4, 9 * 4, 8 * 4, 7 * 4, /* %eax, %ecx, %edx, %ebx */
174 16 * 4, 5 * 4, /* %esp, %ebp */
175 4 * 4, 3 * 4, /* %esi, %edi */
176 13 * 4, 15 * 4, /* %eip, %eflags */
177 14 * 4, 17 * 4, /* %cs, %ss */
178 2 * 4, 1 * 4, 0 * 4, 18 * 4 /* %ds, %es, %fs, %gs */
181 /* From <machine/signal.h>. */
182 int i386fbsd4_sc_reg_offset
[] =
184 20 + 11 * 4, /* %eax */
185 20 + 10 * 4, /* %ecx */
186 20 + 9 * 4, /* %edx */
187 20 + 8 * 4, /* %ebx */
188 20 + 17 * 4, /* %esp */
189 20 + 6 * 4, /* %ebp */
190 20 + 5 * 4, /* %esi */
191 20 + 4 * 4, /* %edi */
192 20 + 14 * 4, /* %eip */
193 20 + 16 * 4, /* %eflags */
194 20 + 15 * 4, /* %cs */
195 20 + 18 * 4, /* %ss */
196 20 + 3 * 4, /* %ds */
197 20 + 2 * 4, /* %es */
198 20 + 1 * 4, /* %fs */
203 i386fbsd4_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
205 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
207 /* Inherit stuff from older releases. We assume that FreeBSD
208 4.0-RELEASE always uses ELF. */
209 i386fbsd_init_abi (info
, gdbarch
);
211 /* FreeBSD 4.0 introduced a new `struct reg'. */
212 tdep
->gregset_reg_offset
= i386fbsd4_r_reg_offset
;
213 tdep
->gregset_num_regs
= ARRAY_SIZE (i386fbsd4_r_reg_offset
);
214 tdep
->sizeof_gregset
= 19 * 4;
216 /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
217 tdep
->sc_reg_offset
= i386fbsd4_sc_reg_offset
;
218 tdep
->sc_num_regs
= ARRAY_SIZE (i386fbsd4_sc_reg_offset
);
222 /* Provide a prototype to silence -Wmissing-prototypes. */
223 void _initialize_i386fbsd_tdep (void);
226 _initialize_i386fbsd_tdep (void)
228 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_FREEBSD_AOUT
,
229 i386fbsdaout_init_abi
);
230 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_FREEBSD_ELF
,