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8a96bc77 MK |
1 | /* Target-dependent code for FreeBSD/i386. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2003-2014 Free Software Foundation, Inc. |
8a96bc77 MK |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
8a96bc77 MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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19 | |
20 | #include "defs.h" | |
21 | #include "arch-utils.h" | |
fa565c2b | 22 | #include "gdbcore.h" |
8a96bc77 | 23 | #include "osabi.h" |
fa565c2b MK |
24 | #include "regcache.h" |
25 | ||
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26 | #include "i386-tdep.h" |
27 | #include "i387-tdep.h" | |
fa565c2b | 28 | #include "bsd-uthread.h" |
490496c3 | 29 | #include "fbsd-tdep.h" |
7e654c37 | 30 | #include "solib-svr4.h" |
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31 | |
32 | /* FreeBSD 3.0-RELEASE or later. */ | |
33 | ||
34 | /* From <machine/reg.h>. */ | |
35 | static int i386fbsd_r_reg_offset[] = | |
36 | { | |
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 */ | |
43 | }; | |
44 | ||
5d93ae8c MK |
45 | /* Sigtramp routine location. */ |
46 | CORE_ADDR i386fbsd_sigtramp_start_addr = 0xbfbfdf20; | |
47 | CORE_ADDR i386fbsd_sigtramp_end_addr = 0xbfbfdff0; | |
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48 | |
49 | /* From <machine/signal.h>. */ | |
abfcdd21 | 50 | int i386fbsd_sc_reg_offset[] = |
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51 | { |
52 | 8 + 14 * 4, /* %eax */ | |
53 | 8 + 13 * 4, /* %ecx */ | |
54 | 8 + 12 * 4, /* %edx */ | |
55 | 8 + 11 * 4, /* %ebx */ | |
56 | 8 + 0 * 4, /* %esp */ | |
57 | 8 + 1 * 4, /* %ebp */ | |
58 | 8 + 10 * 4, /* %esi */ | |
59 | 8 + 9 * 4, /* %edi */ | |
60 | 8 + 3 * 4, /* %eip */ | |
61 | 8 + 4 * 4, /* %eflags */ | |
62 | 8 + 7 * 4, /* %cs */ | |
63 | 8 + 8 * 4, /* %ss */ | |
64 | 8 + 6 * 4, /* %ds */ | |
65 | 8 + 5 * 4, /* %es */ | |
66 | 8 + 15 * 4, /* %fs */ | |
67 | 8 + 16 * 4 /* %gs */ | |
68 | }; | |
69 | ||
1c02b2a5 | 70 | /* From /usr/src/lib/libc/i386/gen/_setjmp.S. */ |
fa565c2b MK |
71 | static int i386fbsd_jmp_buf_reg_offset[] = |
72 | { | |
73 | -1, /* %eax */ | |
74 | -1, /* %ecx */ | |
75 | -1, /* %edx */ | |
76 | 1 * 4, /* %ebx */ | |
77 | 2 * 4, /* %esp */ | |
78 | 3 * 4, /* %ebp */ | |
79 | 4 * 4, /* %esi */ | |
80 | 5 * 4, /* %edi */ | |
81 | 0 * 4 /* %eip */ | |
82 | }; | |
83 | ||
84 | static void | |
85 | i386fbsd_supply_uthread (struct regcache *regcache, | |
86 | int regnum, CORE_ADDR addr) | |
87 | { | |
e362b510 | 88 | gdb_byte buf[4]; |
fa565c2b MK |
89 | int i; |
90 | ||
91 | gdb_assert (regnum >= -1); | |
92 | ||
93 | for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++) | |
94 | { | |
95 | if (i386fbsd_jmp_buf_reg_offset[i] != -1 | |
96 | && (regnum == -1 || regnum == i)) | |
97 | { | |
98 | read_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4); | |
99 | regcache_raw_supply (regcache, i, buf); | |
100 | } | |
101 | } | |
102 | } | |
103 | ||
104 | static void | |
105 | i386fbsd_collect_uthread (const struct regcache *regcache, | |
106 | int regnum, CORE_ADDR addr) | |
107 | { | |
e362b510 | 108 | gdb_byte buf[4]; |
fa565c2b MK |
109 | int i; |
110 | ||
111 | gdb_assert (regnum >= -1); | |
112 | ||
113 | for (i = 0; i < ARRAY_SIZE (i386fbsd_jmp_buf_reg_offset); i++) | |
114 | { | |
115 | if (i386fbsd_jmp_buf_reg_offset[i] != -1 | |
116 | && (regnum == -1 || regnum == i)) | |
117 | { | |
118 | regcache_raw_collect (regcache, i, buf); | |
119 | write_memory (addr + i386fbsd_jmp_buf_reg_offset[i], buf, 4); | |
120 | } | |
121 | } | |
122 | } | |
123 | ||
8a96bc77 MK |
124 | static void |
125 | i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
126 | { | |
127 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
128 | ||
129 | /* Obviously FreeBSD is BSD-based. */ | |
130 | i386bsd_init_abi (info, gdbarch); | |
131 | ||
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; | |
138 | ||
139 | /* FreeBSD uses -freg-struct-return by default. */ | |
140 | tdep->struct_return = reg_struct_return; | |
141 | ||
142 | /* FreeBSD uses a different memory layout. */ | |
5d93ae8c MK |
143 | tdep->sigtramp_start = i386fbsd_sigtramp_start_addr; |
144 | tdep->sigtramp_end = i386fbsd_sigtramp_end_addr; | |
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145 | |
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); | |
fa565c2b MK |
149 | |
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); | |
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153 | } |
154 | ||
155 | static void | |
156 | i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
157 | { | |
158 | /* It's almost identical to FreeBSD a.out. */ | |
159 | i386fbsdaout_init_abi (info, gdbarch); | |
160 | ||
161 | /* Except that it uses ELF. */ | |
162 | i386_elf_init_abi (info, gdbarch); | |
163 | ||
164 | /* FreeBSD ELF uses SVR4-style shared libraries. */ | |
7e654c37 MK |
165 | set_solib_svr4_fetch_link_map_offsets |
166 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
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167 | } |
168 | ||
169 | /* FreeBSD 4.0-RELEASE or later. */ | |
170 | ||
171 | /* From <machine/reg.h>. */ | |
172 | static int i386fbsd4_r_reg_offset[] = | |
173 | { | |
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 */ | |
180 | }; | |
181 | ||
182 | /* From <machine/signal.h>. */ | |
183 | int i386fbsd4_sc_reg_offset[] = | |
184 | { | |
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 */ | |
200 | 20 + 0 * 4 /* %gs */ | |
201 | }; | |
202 | ||
203 | static void | |
204 | i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
205 | { | |
206 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
207 | ||
490496c3 AA |
208 | /* Generic FreeBSD support. */ |
209 | fbsd_init_abi (info, gdbarch); | |
210 | ||
8a96bc77 MK |
211 | /* Inherit stuff from older releases. We assume that FreeBSD |
212 | 4.0-RELEASE always uses ELF. */ | |
213 | i386fbsd_init_abi (info, gdbarch); | |
214 | ||
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; | |
219 | ||
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); | |
223 | } | |
224 | ||
225 | \f | |
226 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
227 | void _initialize_i386fbsd_tdep (void); | |
228 | ||
229 | void | |
230 | _initialize_i386fbsd_tdep (void) | |
231 | { | |
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, | |
235 | i386fbsd4_init_abi); | |
236 | } |