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e6031aeb | 1 | /* Native-dependent code for modern i386 BSD's. |
3f63813d | 2 | |
42a4f53d | 3 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
e6031aeb 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 |
e6031aeb 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/>. */ |
e6031aeb MK |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
4e052eda | 22 | #include "regcache.h" |
e6031aeb | 23 | |
b7247919 | 24 | #include <signal.h> |
e6031aeb MK |
25 | #include <sys/types.h> |
26 | #include <sys/ptrace.h> | |
27 | #include <machine/reg.h> | |
28 | #include <machine/frame.h> | |
29 | ||
57976e88 | 30 | #include "i386-tdep.h" |
1fc7d519 | 31 | #include "i387-tdep.h" |
03b62bbb SM |
32 | #include "x86-bsd-nat.h" |
33 | #include "i386-bsd-nat.h" | |
9692934b | 34 | #include "inf-ptrace.h" |
b051bfa4 MK |
35 | \f |
36 | ||
e6031aeb MK |
37 | /* In older BSD versions we cannot get at some of the segment |
38 | registers. FreeBSD for example didn't support the %fs and %gs | |
39 | registers until the 3.0 release. We have autoconf checks for their | |
40 | presence, and deal gracefully with their absence. */ | |
41 | ||
6cfb2041 MK |
42 | /* Offset in `struct reg' where MEMBER is stored. */ |
43 | #define REG_OFFSET(member) offsetof (struct reg, member) | |
e6031aeb | 44 | |
6cfb2041 MK |
45 | /* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct |
46 | reg' where the GDB register REGNUM is stored. Unsupported | |
e6031aeb | 47 | registers are marked with `-1'. */ |
6cfb2041 | 48 | static int i386bsd_r_reg_offset[] = |
e6031aeb MK |
49 | { |
50 | REG_OFFSET (r_eax), | |
51 | REG_OFFSET (r_ecx), | |
52 | REG_OFFSET (r_edx), | |
2c48bda3 | 53 | REG_OFFSET (r_ebx), |
e6031aeb MK |
54 | REG_OFFSET (r_esp), |
55 | REG_OFFSET (r_ebp), | |
56 | REG_OFFSET (r_esi), | |
57 | REG_OFFSET (r_edi), | |
58 | REG_OFFSET (r_eip), | |
59 | REG_OFFSET (r_eflags), | |
60 | REG_OFFSET (r_cs), | |
61 | REG_OFFSET (r_ss), | |
62 | REG_OFFSET (r_ds), | |
63 | REG_OFFSET (r_es), | |
422ea4b8 | 64 | #ifdef HAVE_STRUCT_REG_R_FS |
e6031aeb MK |
65 | REG_OFFSET (r_fs), |
66 | #else | |
67 | -1, | |
68 | #endif | |
422ea4b8 | 69 | #ifdef HAVE_STRUCT_REG_R_GS |
e6031aeb MK |
70 | REG_OFFSET (r_gs) |
71 | #else | |
72 | -1 | |
73 | #endif | |
74 | }; | |
75 | ||
7e89e357 | 76 | /* Macro to determine if a register is fetched with PT_GETREGS. */ |
283accbc MK |
77 | #define GETREGS_SUPPLIES(regnum) \ |
78 | ((0 <= (regnum) && (regnum) <= 15)) | |
7e89e357 JT |
79 | |
80 | #ifdef HAVE_PT_GETXMMREGS | |
81 | /* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1 | |
82 | so that we try PT_GETXMMREGS the first time around. */ | |
83 | static int have_ptrace_xmmregs = -1; | |
84 | #endif | |
e6031aeb MK |
85 | \f |
86 | ||
6cfb2041 | 87 | /* Supply the general-purpose registers in GREGS, to REGCACHE. */ |
e6031aeb | 88 | |
1fc7d519 | 89 | static void |
6cfb2041 | 90 | i386bsd_supply_gregset (struct regcache *regcache, const void *gregs) |
e6031aeb | 91 | { |
21002a63 | 92 | const char *regs = (const char *) gregs; |
feae6502 | 93 | int regnum; |
e6031aeb | 94 | |
6cfb2041 | 95 | for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++) |
e6031aeb | 96 | { |
6cfb2041 MK |
97 | int offset = i386bsd_r_reg_offset[regnum]; |
98 | ||
99 | if (offset != -1) | |
73e1c03f | 100 | regcache->raw_supply (regnum, regs + offset); |
e6031aeb MK |
101 | } |
102 | } | |
103 | ||
6cfb2041 MK |
104 | /* Collect register REGNUM from REGCACHE and store its contents in |
105 | GREGS. If REGNUM is -1, collect and store all appropriate | |
106 | registers. */ | |
e6031aeb | 107 | |
1fc7d519 | 108 | static void |
6cfb2041 MK |
109 | i386bsd_collect_gregset (const struct regcache *regcache, |
110 | void *gregs, int regnum) | |
e6031aeb | 111 | { |
21002a63 | 112 | char *regs = (char *) gregs; |
e6031aeb MK |
113 | int i; |
114 | ||
6cfb2041 MK |
115 | for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++) |
116 | { | |
117 | if (regnum == -1 || regnum == i) | |
118 | { | |
119 | int offset = i386bsd_r_reg_offset[i]; | |
e6031aeb | 120 | |
6cfb2041 | 121 | if (offset != -1) |
34a79281 | 122 | regcache->raw_collect (i, regs + offset); |
6cfb2041 MK |
123 | } |
124 | } | |
125 | } | |
e6031aeb | 126 | |
283accbc | 127 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
e6031aeb MK |
128 | for all registers (including the floating point registers). */ |
129 | ||
f6ac5f3d PA |
130 | void |
131 | i386bsd_fetch_inferior_registers (struct regcache *regcache, int regnum) | |
e6031aeb | 132 | { |
222312d3 | 133 | pid_t pid = get_ptrace_pid (regcache->ptid ()); |
aac12e24 | 134 | |
283accbc | 135 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 136 | { |
6cfb2041 | 137 | struct reg regs; |
7e89e357 | 138 | |
aac12e24 | 139 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 140 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 141 | |
56be3814 | 142 | i386bsd_supply_gregset (regcache, ®s); |
283accbc | 143 | if (regnum != -1) |
7e89e357 JT |
144 | return; |
145 | } | |
e6031aeb | 146 | |
283accbc | 147 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 148 | { |
6cfb2041 | 149 | struct fpreg fpregs; |
7e89e357 JT |
150 | #ifdef HAVE_PT_GETXMMREGS |
151 | char xmmregs[512]; | |
97de3545 JB |
152 | #endif |
153 | ||
154 | #ifdef PT_GETXSTATE_INFO | |
a3405d12 | 155 | if (x86bsd_xsave_len != 0) |
97de3545 | 156 | { |
21002a63 | 157 | void *xstateregs; |
97de3545 | 158 | |
a3405d12 | 159 | xstateregs = alloca (x86bsd_xsave_len); |
aac12e24 | 160 | if (ptrace (PT_GETXSTATE, pid, |
97de3545 JB |
161 | (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) |
162 | perror_with_name (_("Couldn't get extended state status")); | |
7e89e357 | 163 | |
97de3545 JB |
164 | i387_supply_xsave (regcache, -1, xstateregs); |
165 | return; | |
166 | } | |
167 | #endif | |
168 | ||
169 | #ifdef HAVE_PT_GETXMMREGS | |
a144416f | 170 | if (have_ptrace_xmmregs != 0 |
aac12e24 | 171 | && ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
172 | { |
173 | have_ptrace_xmmregs = 1; | |
56be3814 | 174 | i387_supply_fxsave (regcache, -1, xmmregs); |
7e89e357 JT |
175 | } |
176 | else | |
177 | { | |
97de3545 JB |
178 | have_ptrace_xmmregs = 0; |
179 | #endif | |
aac12e24 | 180 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 181 | perror_with_name (_("Couldn't get floating point status")); |
e6031aeb | 182 | |
56be3814 | 183 | i387_supply_fsave (regcache, -1, &fpregs); |
97de3545 | 184 | #ifdef HAVE_PT_GETXMMREGS |
7e89e357 | 185 | } |
7e89e357 | 186 | #endif |
e6031aeb | 187 | } |
b051bfa4 | 188 | } |
e6031aeb | 189 | |
283accbc | 190 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
e6031aeb MK |
191 | this for all registers (including the floating point registers). */ |
192 | ||
f6ac5f3d PA |
193 | void |
194 | i386bsd_store_inferior_registers (struct regcache *regcache, int regnum) | |
e6031aeb | 195 | { |
222312d3 | 196 | pid_t pid = get_ptrace_pid (regcache->ptid ()); |
aac12e24 | 197 | |
283accbc | 198 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 199 | { |
6cfb2041 | 200 | struct reg regs; |
7e89e357 | 201 | |
aac12e24 | 202 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 203 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 204 | |
56be3814 | 205 | i386bsd_collect_gregset (regcache, ®s, regnum); |
e6031aeb | 206 | |
aac12e24 | 207 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 208 | perror_with_name (_("Couldn't write registers")); |
7e89e357 | 209 | |
283accbc | 210 | if (regnum != -1) |
7e89e357 JT |
211 | return; |
212 | } | |
e6031aeb | 213 | |
283accbc | 214 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 215 | { |
6cfb2041 | 216 | struct fpreg fpregs; |
7e89e357 JT |
217 | #ifdef HAVE_PT_GETXMMREGS |
218 | char xmmregs[512]; | |
97de3545 JB |
219 | #endif |
220 | ||
221 | #ifdef PT_GETXSTATE_INFO | |
a3405d12 | 222 | if (x86bsd_xsave_len != 0) |
97de3545 | 223 | { |
21002a63 | 224 | void *xstateregs; |
97de3545 | 225 | |
a3405d12 | 226 | xstateregs = alloca (x86bsd_xsave_len); |
aac12e24 | 227 | if (ptrace (PT_GETXSTATE, pid, |
97de3545 JB |
228 | (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) |
229 | perror_with_name (_("Couldn't get extended state status")); | |
e6031aeb | 230 | |
97de3545 JB |
231 | i387_collect_xsave (regcache, -1, xstateregs, 0); |
232 | ||
aac12e24 | 233 | if (ptrace (PT_SETXSTATE, pid, |
a3405d12 | 234 | (PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1) |
97de3545 JB |
235 | perror_with_name (_("Couldn't write extended state status")); |
236 | return; | |
237 | } | |
238 | #endif | |
239 | ||
240 | #ifdef HAVE_PT_GETXMMREGS | |
a144416f | 241 | if (have_ptrace_xmmregs != 0 |
aac12e24 | 242 | && ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
243 | { |
244 | have_ptrace_xmmregs = 1; | |
245 | ||
56be3814 | 246 | i387_collect_fxsave (regcache, regnum, xmmregs); |
e6031aeb | 247 | |
aac12e24 | 248 | if (ptrace (PT_SETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) |
e2e0b3e5 | 249 | perror_with_name (_("Couldn't write XMM registers")); |
7e89e357 JT |
250 | } |
251 | else | |
252 | { | |
253 | have_ptrace_xmmregs = 0; | |
254 | #endif | |
aac12e24 | 255 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 256 | perror_with_name (_("Couldn't get floating point status")); |
7e89e357 | 257 | |
56be3814 | 258 | i387_collect_fsave (regcache, regnum, &fpregs); |
f5b1afdf | 259 | |
aac12e24 | 260 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 261 | perror_with_name (_("Couldn't write floating point status")); |
7e89e357 JT |
262 | #ifdef HAVE_PT_GETXMMREGS |
263 | } | |
264 | #endif | |
e6031aeb MK |
265 | } |
266 | } | |
9692934b | 267 | |
b7247919 MK |
268 | void |
269 | _initialize_i386bsd_nat (void) | |
270 | { | |
a3386186 | 271 | int offset; |
8201327c | 272 | |
03b62bbb | 273 | /* To support the recognition of signal handlers, i386-bsd-tdep.c |
b7247919 MK |
274 | hardcodes some constants. Inclusion of this file means that we |
275 | are compiling a native debugger, which means that we can use the | |
276 | system header files and sysctl(3) to get at the relevant | |
277 | information. */ | |
278 | ||
8201327c | 279 | #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 |
a3386186 MK |
280 | #define SC_REG_OFFSET i386fbsd4_sc_reg_offset |
281 | #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 | |
a3386186 | 282 | #define SC_REG_OFFSET i386fbsd_sc_reg_offset |
005328e3 | 283 | #elif defined (NetBSD) || defined (__NetBSD_Version__) |
a3386186 | 284 | #define SC_REG_OFFSET i386nbsd_sc_reg_offset |
005328e3 | 285 | #elif defined (OpenBSD) |
a3386186 | 286 | #define SC_REG_OFFSET i386obsd_sc_reg_offset |
8201327c MK |
287 | #endif |
288 | ||
bbe06c74 MK |
289 | #ifdef SC_REG_OFFSET |
290 | ||
a3386186 MK |
291 | /* We only check the program counter, stack pointer and frame |
292 | pointer since these members of `struct sigcontext' are essential | |
293 | for providing backtraces. More checks could be added, but would | |
294 | involve adding configure checks for the appropriate structure | |
295 | members, since older BSD's don't provide all of them. */ | |
296 | ||
297 | #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] | |
298 | #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] | |
299 | #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] | |
300 | ||
b7247919 MK |
301 | /* Override the default value for the offset of the program counter |
302 | in the sigcontext structure. */ | |
a3386186 | 303 | offset = offsetof (struct sigcontext, sc_pc); |
8201327c | 304 | |
a3386186 | 305 | if (SC_PC_OFFSET != offset) |
8201327c | 306 | { |
8a3fe4f8 | 307 | warning (_("\ |
8201327c | 308 | offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ |
8a3fe4f8 | 309 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 310 | offset, SC_PC_OFFSET); |
8201327c MK |
311 | } |
312 | ||
a3386186 | 313 | SC_PC_OFFSET = offset; |
6bff26de MK |
314 | |
315 | /* Likewise for the stack pointer. */ | |
a3386186 | 316 | offset = offsetof (struct sigcontext, sc_sp); |
6bff26de | 317 | |
a3386186 | 318 | if (SC_SP_OFFSET != offset) |
6bff26de | 319 | { |
8a3fe4f8 | 320 | warning (_("\ |
6bff26de | 321 | offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ |
8a3fe4f8 | 322 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 MK |
323 | offset, SC_SP_OFFSET); |
324 | } | |
325 | ||
326 | SC_SP_OFFSET = offset; | |
327 | ||
328 | /* And the frame pointer. */ | |
329 | offset = offsetof (struct sigcontext, sc_fp); | |
330 | ||
331 | if (SC_FP_OFFSET != offset) | |
332 | { | |
8a3fe4f8 | 333 | warning (_("\ |
a3386186 | 334 | offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ |
8a3fe4f8 | 335 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 336 | offset, SC_FP_OFFSET); |
6bff26de MK |
337 | } |
338 | ||
a3386186 | 339 | SC_FP_OFFSET = offset; |
bbe06c74 MK |
340 | |
341 | #endif /* SC_REG_OFFSET */ | |
b7247919 | 342 | } |