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e6031aeb | 1 | /* Native-dependent code for modern i386 BSD's. |
3f63813d | 2 | |
61baf725 | 3 | Copyright (C) 2000-2017 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) | |
100 | regcache_raw_supply (regcache, 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 MK |
121 | if (offset != -1) |
122 | regcache_raw_collect (regcache, i, regs + offset); | |
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 | ||
9692934b | 130 | static void |
28439f5e PA |
131 | i386bsd_fetch_inferior_registers (struct target_ops *ops, |
132 | struct regcache *regcache, int regnum) | |
e6031aeb | 133 | { |
aac12e24 SM |
134 | pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache)); |
135 | ||
283accbc | 136 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 137 | { |
6cfb2041 | 138 | struct reg regs; |
7e89e357 | 139 | |
aac12e24 | 140 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 141 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 142 | |
56be3814 | 143 | i386bsd_supply_gregset (regcache, ®s); |
283accbc | 144 | if (regnum != -1) |
7e89e357 JT |
145 | return; |
146 | } | |
e6031aeb | 147 | |
283accbc | 148 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 149 | { |
6cfb2041 | 150 | struct fpreg fpregs; |
7e89e357 JT |
151 | #ifdef HAVE_PT_GETXMMREGS |
152 | char xmmregs[512]; | |
97de3545 JB |
153 | #endif |
154 | ||
155 | #ifdef PT_GETXSTATE_INFO | |
a3405d12 | 156 | if (x86bsd_xsave_len != 0) |
97de3545 | 157 | { |
21002a63 | 158 | void *xstateregs; |
97de3545 | 159 | |
a3405d12 | 160 | xstateregs = alloca (x86bsd_xsave_len); |
aac12e24 | 161 | if (ptrace (PT_GETXSTATE, pid, |
97de3545 JB |
162 | (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) |
163 | perror_with_name (_("Couldn't get extended state status")); | |
7e89e357 | 164 | |
97de3545 JB |
165 | i387_supply_xsave (regcache, -1, xstateregs); |
166 | return; | |
167 | } | |
168 | #endif | |
169 | ||
170 | #ifdef HAVE_PT_GETXMMREGS | |
a144416f | 171 | if (have_ptrace_xmmregs != 0 |
aac12e24 | 172 | && ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
173 | { |
174 | have_ptrace_xmmregs = 1; | |
56be3814 | 175 | i387_supply_fxsave (regcache, -1, xmmregs); |
7e89e357 JT |
176 | } |
177 | else | |
178 | { | |
97de3545 JB |
179 | have_ptrace_xmmregs = 0; |
180 | #endif | |
aac12e24 | 181 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 182 | perror_with_name (_("Couldn't get floating point status")); |
e6031aeb | 183 | |
56be3814 | 184 | i387_supply_fsave (regcache, -1, &fpregs); |
97de3545 | 185 | #ifdef HAVE_PT_GETXMMREGS |
7e89e357 | 186 | } |
7e89e357 | 187 | #endif |
e6031aeb | 188 | } |
b051bfa4 | 189 | } |
e6031aeb | 190 | |
283accbc | 191 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
e6031aeb MK |
192 | this for all registers (including the floating point registers). */ |
193 | ||
9692934b | 194 | static void |
28439f5e PA |
195 | i386bsd_store_inferior_registers (struct target_ops *ops, |
196 | struct regcache *regcache, int regnum) | |
e6031aeb | 197 | { |
aac12e24 SM |
198 | pid_t pid = get_ptrace_pid (regcache_get_ptid (regcache)); |
199 | ||
283accbc | 200 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 201 | { |
6cfb2041 | 202 | struct reg regs; |
7e89e357 | 203 | |
aac12e24 | 204 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 205 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 206 | |
56be3814 | 207 | i386bsd_collect_gregset (regcache, ®s, regnum); |
e6031aeb | 208 | |
aac12e24 | 209 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 210 | perror_with_name (_("Couldn't write registers")); |
7e89e357 | 211 | |
283accbc | 212 | if (regnum != -1) |
7e89e357 JT |
213 | return; |
214 | } | |
e6031aeb | 215 | |
283accbc | 216 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 217 | { |
6cfb2041 | 218 | struct fpreg fpregs; |
7e89e357 JT |
219 | #ifdef HAVE_PT_GETXMMREGS |
220 | char xmmregs[512]; | |
97de3545 JB |
221 | #endif |
222 | ||
223 | #ifdef PT_GETXSTATE_INFO | |
a3405d12 | 224 | if (x86bsd_xsave_len != 0) |
97de3545 | 225 | { |
21002a63 | 226 | void *xstateregs; |
97de3545 | 227 | |
a3405d12 | 228 | xstateregs = alloca (x86bsd_xsave_len); |
aac12e24 | 229 | if (ptrace (PT_GETXSTATE, pid, |
97de3545 JB |
230 | (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) |
231 | perror_with_name (_("Couldn't get extended state status")); | |
e6031aeb | 232 | |
97de3545 JB |
233 | i387_collect_xsave (regcache, -1, xstateregs, 0); |
234 | ||
aac12e24 | 235 | if (ptrace (PT_SETXSTATE, pid, |
a3405d12 | 236 | (PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1) |
97de3545 JB |
237 | perror_with_name (_("Couldn't write extended state status")); |
238 | return; | |
239 | } | |
240 | #endif | |
241 | ||
242 | #ifdef HAVE_PT_GETXMMREGS | |
a144416f | 243 | if (have_ptrace_xmmregs != 0 |
aac12e24 | 244 | && ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
245 | { |
246 | have_ptrace_xmmregs = 1; | |
247 | ||
56be3814 | 248 | i387_collect_fxsave (regcache, regnum, xmmregs); |
e6031aeb | 249 | |
aac12e24 | 250 | if (ptrace (PT_SETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) |
e2e0b3e5 | 251 | perror_with_name (_("Couldn't write XMM registers")); |
7e89e357 JT |
252 | } |
253 | else | |
254 | { | |
255 | have_ptrace_xmmregs = 0; | |
256 | #endif | |
aac12e24 | 257 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 258 | perror_with_name (_("Couldn't get floating point status")); |
7e89e357 | 259 | |
56be3814 | 260 | i387_collect_fsave (regcache, regnum, &fpregs); |
f5b1afdf | 261 | |
aac12e24 | 262 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 263 | perror_with_name (_("Couldn't write floating point status")); |
7e89e357 JT |
264 | #ifdef HAVE_PT_GETXMMREGS |
265 | } | |
266 | #endif | |
e6031aeb MK |
267 | } |
268 | } | |
9692934b MK |
269 | |
270 | /* Create a prototype *BSD/i386 target. The client can override it | |
271 | with local methods. */ | |
272 | ||
273 | struct target_ops * | |
274 | i386bsd_target (void) | |
275 | { | |
276 | struct target_ops *t; | |
277 | ||
a3405d12 | 278 | t = x86bsd_target (); |
9692934b MK |
279 | t->to_fetch_registers = i386bsd_fetch_inferior_registers; |
280 | t->to_store_registers = i386bsd_store_inferior_registers; | |
281 | return t; | |
282 | } | |
15add3f5 | 283 | |
b7247919 MK |
284 | void |
285 | _initialize_i386bsd_nat (void) | |
286 | { | |
a3386186 | 287 | int offset; |
8201327c | 288 | |
03b62bbb | 289 | /* To support the recognition of signal handlers, i386-bsd-tdep.c |
b7247919 MK |
290 | hardcodes some constants. Inclusion of this file means that we |
291 | are compiling a native debugger, which means that we can use the | |
292 | system header files and sysctl(3) to get at the relevant | |
293 | information. */ | |
294 | ||
8201327c | 295 | #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 |
a3386186 MK |
296 | #define SC_REG_OFFSET i386fbsd4_sc_reg_offset |
297 | #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 | |
a3386186 | 298 | #define SC_REG_OFFSET i386fbsd_sc_reg_offset |
005328e3 | 299 | #elif defined (NetBSD) || defined (__NetBSD_Version__) |
a3386186 | 300 | #define SC_REG_OFFSET i386nbsd_sc_reg_offset |
005328e3 | 301 | #elif defined (OpenBSD) |
a3386186 | 302 | #define SC_REG_OFFSET i386obsd_sc_reg_offset |
8201327c MK |
303 | #endif |
304 | ||
bbe06c74 MK |
305 | #ifdef SC_REG_OFFSET |
306 | ||
a3386186 MK |
307 | /* We only check the program counter, stack pointer and frame |
308 | pointer since these members of `struct sigcontext' are essential | |
309 | for providing backtraces. More checks could be added, but would | |
310 | involve adding configure checks for the appropriate structure | |
311 | members, since older BSD's don't provide all of them. */ | |
312 | ||
313 | #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] | |
314 | #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] | |
315 | #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] | |
316 | ||
b7247919 MK |
317 | /* Override the default value for the offset of the program counter |
318 | in the sigcontext structure. */ | |
a3386186 | 319 | offset = offsetof (struct sigcontext, sc_pc); |
8201327c | 320 | |
a3386186 | 321 | if (SC_PC_OFFSET != offset) |
8201327c | 322 | { |
8a3fe4f8 | 323 | warning (_("\ |
8201327c | 324 | offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ |
8a3fe4f8 | 325 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 326 | offset, SC_PC_OFFSET); |
8201327c MK |
327 | } |
328 | ||
a3386186 | 329 | SC_PC_OFFSET = offset; |
6bff26de MK |
330 | |
331 | /* Likewise for the stack pointer. */ | |
a3386186 | 332 | offset = offsetof (struct sigcontext, sc_sp); |
6bff26de | 333 | |
a3386186 | 334 | if (SC_SP_OFFSET != offset) |
6bff26de | 335 | { |
8a3fe4f8 | 336 | warning (_("\ |
6bff26de | 337 | offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ |
8a3fe4f8 | 338 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 MK |
339 | offset, SC_SP_OFFSET); |
340 | } | |
341 | ||
342 | SC_SP_OFFSET = offset; | |
343 | ||
344 | /* And the frame pointer. */ | |
345 | offset = offsetof (struct sigcontext, sc_fp); | |
346 | ||
347 | if (SC_FP_OFFSET != offset) | |
348 | { | |
8a3fe4f8 | 349 | warning (_("\ |
a3386186 | 350 | offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ |
8a3fe4f8 | 351 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 352 | offset, SC_FP_OFFSET); |
6bff26de MK |
353 | } |
354 | ||
a3386186 | 355 | SC_FP_OFFSET = offset; |
bbe06c74 MK |
356 | |
357 | #endif /* SC_REG_OFFSET */ | |
b7247919 | 358 | } |