Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
ecd75fc8 | 3 | Copyright (C) 1999-2014 Free Software Foundation, Inc. |
d4f3574e | 4 | |
04cd15b6 | 5 | This file is part of GDB. |
d4f3574e | 6 | |
04cd15b6 MK |
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 |
04cd15b6 | 10 | (at your option) any later version. |
d4f3574e | 11 | |
04cd15b6 MK |
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. | |
d4f3574e | 16 | |
04cd15b6 | 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/>. */ |
d4f3574e SS |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
22 | #include "gdbcore.h" | |
4e052eda | 23 | #include "regcache.h" |
c131fcee | 24 | #include "elf/common.h" |
d4f3574e | 25 | #include <sys/ptrace.h> |
c60c0f5f | 26 | #include "gregset.h" |
3116063b | 27 | #include "gdb_proc_service.h" |
c60c0f5f | 28 | |
3116063b | 29 | #include "i386-linux-nat.h" |
e750d25e | 30 | #include "i387-tdep.h" |
c3833324 | 31 | #include "i386-tdep.h" |
5179e78f | 32 | #include "i386-linux-tdep.h" |
c131fcee L |
33 | #include "i386-xstate.h" |
34 | ||
040baaf6 | 35 | #include "x86-linux-nat.h" |
d4f3574e | 36 | |
a4b6fc86 AC |
37 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
38 | the register sets in `struct user' that is used for a.out | |
39 | core-dumps, and is also used by `ptrace'. The corresponding types | |
40 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
41 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
42 | for the floating-point registers. | |
43 | ||
44 | Those types used to be available under the names `gregset_t' and | |
45 | `fpregset_t' too, and this file used those names in the past. But | |
46 | those names are now used for the register sets used in the | |
47 | `mcontext_t' type, and have a different size and layout. */ | |
48 | ||
5c44784c JM |
49 | /* Which ptrace request retrieves which registers? |
50 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 51 | |
5c44784c | 52 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 53 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 54 | |
6ce2ac0b | 55 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 56 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 57 | |
c131fcee | 58 | #define GETXSTATEREGS_SUPPLIES(regno) \ |
01f9f808 | 59 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX512_NUM_REGS) |
c131fcee | 60 | |
f60300e7 MK |
61 | /* Does the current host support the GETREGS request? */ |
62 | int have_ptrace_getregs = | |
63 | #ifdef HAVE_PTRACE_GETREGS | |
64 | 1 | |
65 | #else | |
66 | 0 | |
67 | #endif | |
68 | ; | |
69 | ||
6ce2ac0b | 70 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
71 | file may or may not define it, and even if it is defined, the |
72 | kernel will return EIO if it's running on a pre-SSE processor. | |
73 | ||
74 | My instinct is to attach this to some architecture- or | |
75 | target-specific data structure, but really, a particular GDB | |
76 | process can only run on top of one kernel at a time. So it's okay | |
77 | for this to be a simple variable. */ | |
6ce2ac0b MK |
78 | int have_ptrace_getfpxregs = |
79 | #ifdef HAVE_PTRACE_GETFPXREGS | |
3a13a53b | 80 | -1 |
5c44784c JM |
81 | #else |
82 | 0 | |
83 | #endif | |
84 | ; | |
f60300e7 | 85 | \f |
6ce2ac0b | 86 | |
ce556f85 | 87 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
88 | |
89 | /* Fetch one register. */ | |
90 | ||
91 | static void | |
56be3814 | 92 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 93 | { |
f60300e7 | 94 | int tid; |
ce556f85 | 95 | int val; |
f60300e7 | 96 | |
ce556f85 | 97 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 98 | if (i386_linux_gregset_reg_offset[regno] == -1) |
f60300e7 | 99 | { |
56be3814 | 100 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
101 | return; |
102 | } | |
103 | ||
ce556f85 | 104 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 105 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 106 | if (tid == 0) |
dfd4cc63 | 107 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 108 | |
ce556f85 | 109 | errno = 0; |
be0d2954 L |
110 | val = ptrace (PTRACE_PEEKUSER, tid, |
111 | i386_linux_gregset_reg_offset[regno], 0); | |
ce556f85 | 112 | if (errno != 0) |
c9f4d572 | 113 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 114 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 115 | regno, safe_strerror (errno)); |
f60300e7 | 116 | |
56be3814 | 117 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
118 | } |
119 | ||
1777feb0 | 120 | /* Store one register. */ |
f60300e7 MK |
121 | |
122 | static void | |
56be3814 | 123 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 124 | { |
f60300e7 | 125 | int tid; |
ce556f85 | 126 | int val; |
f60300e7 | 127 | |
ce556f85 | 128 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 129 | if (i386_linux_gregset_reg_offset[regno] == -1) |
ce556f85 | 130 | return; |
f60300e7 | 131 | |
ce556f85 | 132 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 133 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 134 | if (tid == 0) |
dfd4cc63 | 135 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 136 | |
ce556f85 | 137 | errno = 0; |
56be3814 | 138 | regcache_raw_collect (regcache, regno, &val); |
be0d2954 L |
139 | ptrace (PTRACE_POKEUSER, tid, |
140 | i386_linux_gregset_reg_offset[regno], val); | |
ce556f85 | 141 | if (errno != 0) |
c9f4d572 | 142 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 143 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 144 | regno, safe_strerror (errno)); |
f60300e7 | 145 | } |
5c44784c | 146 | \f |
6ce2ac0b | 147 | |
04cd15b6 MK |
148 | /* Transfering the general-purpose registers between GDB, inferiors |
149 | and core files. */ | |
150 | ||
ad2a4d09 | 151 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 152 | in *GREGSETP. */ |
5c44784c | 153 | |
d4f3574e | 154 | void |
7f7fe91e | 155 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 156 | { |
be0d2954 | 157 | const gdb_byte *regp = (const gdb_byte *) gregsetp; |
6ce2ac0b | 158 | int i; |
d4f3574e | 159 | |
98df6387 | 160 | for (i = 0; i < I386_NUM_GREGS; i++) |
be0d2954 L |
161 | regcache_raw_supply (regcache, i, |
162 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 163 | |
875f8d0e UW |
164 | if (I386_LINUX_ORIG_EAX_REGNUM |
165 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
166 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
167 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
917317f4 JM |
168 | } |
169 | ||
04cd15b6 MK |
170 | /* Fill register REGNO (if it is a general-purpose register) in |
171 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
172 | do this for all registers. */ | |
6ce2ac0b | 173 | |
917317f4 | 174 | void |
7f7fe91e UW |
175 | fill_gregset (const struct regcache *regcache, |
176 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 177 | { |
be0d2954 | 178 | gdb_byte *regp = (gdb_byte *) gregsetp; |
6ce2ac0b | 179 | int i; |
04cd15b6 | 180 | |
98df6387 | 181 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 182 | if (regno == -1 || regno == i) |
be0d2954 L |
183 | regcache_raw_collect (regcache, i, |
184 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 185 | |
82ea117a | 186 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
187 | && I386_LINUX_ORIG_EAX_REGNUM |
188 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
189 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
190 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
d4f3574e SS |
191 | } |
192 | ||
f60300e7 MK |
193 | #ifdef HAVE_PTRACE_GETREGS |
194 | ||
04cd15b6 MK |
195 | /* Fetch all general-purpose registers from process/thread TID and |
196 | store their values in GDB's register array. */ | |
d4f3574e | 197 | |
5c44784c | 198 | static void |
56be3814 | 199 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 200 | { |
04cd15b6 | 201 | elf_gregset_t regs; |
2e024c20 | 202 | elf_gregset_t *regs_p = ®s; |
5c44784c | 203 | |
6ce2ac0b | 204 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 205 | { |
f60300e7 MK |
206 | if (errno == EIO) |
207 | { | |
208 | /* The kernel we're running on doesn't support the GETREGS | |
209 | request. Reset `have_ptrace_getregs'. */ | |
210 | have_ptrace_getregs = 0; | |
211 | return; | |
212 | } | |
213 | ||
e2e0b3e5 | 214 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
215 | } |
216 | ||
2e024c20 | 217 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
218 | } |
219 | ||
04cd15b6 MK |
220 | /* Store all valid general-purpose registers in GDB's register array |
221 | into the process/thread specified by TID. */ | |
5c44784c | 222 | |
5c44784c | 223 | static void |
56be3814 | 224 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 225 | { |
04cd15b6 | 226 | elf_gregset_t regs; |
5c44784c | 227 | |
6ce2ac0b | 228 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 229 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 230 | |
56be3814 | 231 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
232 | |
233 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 234 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
235 | } |
236 | ||
f60300e7 MK |
237 | #else |
238 | ||
56be3814 UW |
239 | static void fetch_regs (struct regcache *regcache, int tid) {} |
240 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
241 | |
242 | #endif | |
5c44784c | 243 | \f |
5c44784c | 244 | |
6ce2ac0b | 245 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 246 | |
04cd15b6 | 247 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 248 | *FPREGSETP. */ |
04cd15b6 | 249 | |
d4f3574e | 250 | void |
7f7fe91e | 251 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 252 | { |
7f7fe91e | 253 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 254 | } |
d4f3574e | 255 | |
04cd15b6 MK |
256 | /* Fill register REGNO (if it is a floating-point register) in |
257 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
258 | do this for all registers. */ | |
917317f4 JM |
259 | |
260 | void | |
7f7fe91e UW |
261 | fill_fpregset (const struct regcache *regcache, |
262 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 263 | { |
7f7fe91e | 264 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
265 | } |
266 | ||
f60300e7 MK |
267 | #ifdef HAVE_PTRACE_GETREGS |
268 | ||
04cd15b6 MK |
269 | /* Fetch all floating-point registers from process/thread TID and store |
270 | thier values in GDB's register array. */ | |
917317f4 | 271 | |
d4f3574e | 272 | static void |
56be3814 | 273 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 274 | { |
04cd15b6 | 275 | elf_fpregset_t fpregs; |
d4f3574e | 276 | |
6ce2ac0b | 277 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 278 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 279 | |
56be3814 | 280 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
281 | } |
282 | ||
04cd15b6 MK |
283 | /* Store all valid floating-point registers in GDB's register array |
284 | into the process/thread specified by TID. */ | |
d4f3574e | 285 | |
d4f3574e | 286 | static void |
56be3814 | 287 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 288 | { |
04cd15b6 | 289 | elf_fpregset_t fpregs; |
d4f3574e | 290 | |
6ce2ac0b | 291 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 292 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 293 | |
56be3814 | 294 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 295 | |
6ce2ac0b | 296 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 297 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
298 | } |
299 | ||
f60300e7 MK |
300 | #else |
301 | ||
1777feb0 MS |
302 | static void |
303 | fetch_fpregs (struct regcache *regcache, int tid) | |
304 | { | |
305 | } | |
306 | ||
307 | static void | |
308 | store_fpregs (const struct regcache *regcache, int tid, int regno) | |
309 | { | |
310 | } | |
f60300e7 MK |
311 | |
312 | #endif | |
5c44784c | 313 | \f |
d4f3574e | 314 | |
6ce2ac0b | 315 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 316 | |
c131fcee L |
317 | /* Fetch all registers covered by the PTRACE_GETREGSET request from |
318 | process/thread TID and store their values in GDB's register array. | |
319 | Return non-zero if successful, zero otherwise. */ | |
320 | ||
321 | static int | |
322 | fetch_xstateregs (struct regcache *regcache, int tid) | |
323 | { | |
324 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
325 | struct iovec iov; | |
326 | ||
327 | if (!have_ptrace_getregset) | |
328 | return 0; | |
329 | ||
330 | iov.iov_base = xstateregs; | |
331 | iov.iov_len = sizeof(xstateregs); | |
332 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
333 | &iov) < 0) | |
334 | perror_with_name (_("Couldn't read extended state status")); | |
335 | ||
336 | i387_supply_xsave (regcache, -1, xstateregs); | |
337 | return 1; | |
338 | } | |
339 | ||
340 | /* Store all valid registers in GDB's register array covered by the | |
341 | PTRACE_SETREGSET request into the process/thread specified by TID. | |
342 | Return non-zero if successful, zero otherwise. */ | |
343 | ||
344 | static int | |
345 | store_xstateregs (const struct regcache *regcache, int tid, int regno) | |
346 | { | |
347 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
348 | struct iovec iov; | |
349 | ||
350 | if (!have_ptrace_getregset) | |
351 | return 0; | |
352 | ||
353 | iov.iov_base = xstateregs; | |
354 | iov.iov_len = sizeof(xstateregs); | |
355 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
356 | &iov) < 0) | |
357 | perror_with_name (_("Couldn't read extended state status")); | |
358 | ||
359 | i387_collect_xsave (regcache, regno, xstateregs, 0); | |
360 | ||
361 | if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
362 | (int) &iov) < 0) | |
363 | perror_with_name (_("Couldn't write extended state status")); | |
364 | ||
365 | return 1; | |
366 | } | |
367 | ||
6ce2ac0b | 368 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 | 369 | |
6ce2ac0b | 370 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
371 | process/thread TID and store their values in GDB's register array. |
372 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 373 | |
5c44784c | 374 | static int |
56be3814 | 375 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 376 | { |
6ce2ac0b | 377 | elf_fpxregset_t fpxregs; |
5c44784c | 378 | |
6ce2ac0b | 379 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
380 | return 0; |
381 | ||
6ce2ac0b | 382 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 383 | { |
5c44784c JM |
384 | if (errno == EIO) |
385 | { | |
6ce2ac0b | 386 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
387 | return 0; |
388 | } | |
389 | ||
e2e0b3e5 | 390 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
391 | } |
392 | ||
b7a8b4ef | 393 | i387_supply_fxsave (regcache, -1, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
394 | return 1; |
395 | } | |
d4f3574e | 396 | |
04cd15b6 | 397 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 398 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 399 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 400 | |
5c44784c | 401 | static int |
56be3814 | 402 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 403 | { |
6ce2ac0b | 404 | elf_fpxregset_t fpxregs; |
5c44784c | 405 | |
6ce2ac0b | 406 | if (! have_ptrace_getfpxregs) |
5c44784c | 407 | return 0; |
6ce2ac0b MK |
408 | |
409 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
410 | { |
411 | if (errno == EIO) | |
412 | { | |
413 | have_ptrace_getfpxregs = 0; | |
414 | return 0; | |
415 | } | |
416 | ||
e2e0b3e5 | 417 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 418 | } |
5c44784c | 419 | |
b7a8b4ef | 420 | i387_collect_fxsave (regcache, regno, &fpxregs); |
5c44784c | 421 | |
6ce2ac0b | 422 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 423 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
424 | |
425 | return 1; | |
426 | } | |
427 | ||
5c44784c JM |
428 | #else |
429 | ||
1777feb0 MS |
430 | static int |
431 | fetch_fpxregs (struct regcache *regcache, int tid) | |
432 | { | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static int | |
437 | store_fpxregs (const struct regcache *regcache, int tid, int regno) | |
438 | { | |
439 | return 0; | |
440 | } | |
5c44784c | 441 | |
6ce2ac0b | 442 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 443 | \f |
6ce2ac0b | 444 | |
5c44784c | 445 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 446 | |
04cd15b6 MK |
447 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
448 | this for all registers (including the floating point and SSE | |
449 | registers). */ | |
d4f3574e | 450 | |
10d6c8cd | 451 | static void |
28439f5e PA |
452 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
453 | struct regcache *regcache, int regno) | |
d4f3574e | 454 | { |
ed9a39eb JM |
455 | int tid; |
456 | ||
f60300e7 MK |
457 | /* Use the old method of peeking around in `struct user' if the |
458 | GETREGS request isn't available. */ | |
ce556f85 | 459 | if (!have_ptrace_getregs) |
f60300e7 | 460 | { |
ce556f85 MK |
461 | int i; |
462 | ||
875f8d0e | 463 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 464 | if (regno == -1 || regno == i) |
56be3814 | 465 | fetch_register (regcache, i); |
ce556f85 | 466 | |
f60300e7 MK |
467 | return; |
468 | } | |
469 | ||
a4b6fc86 | 470 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 471 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 472 | if (tid == 0) |
dfd4cc63 | 473 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
ed9a39eb | 474 | |
6ce2ac0b | 475 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 476 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 477 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 478 | zero. */ |
5c44784c JM |
479 | if (regno == -1) |
480 | { | |
56be3814 | 481 | fetch_regs (regcache, tid); |
f60300e7 MK |
482 | |
483 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 484 | if (!have_ptrace_getregs) |
f60300e7 | 485 | { |
84e473c8 | 486 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
487 | return; |
488 | } | |
489 | ||
c131fcee L |
490 | if (fetch_xstateregs (regcache, tid)) |
491 | return; | |
56be3814 | 492 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 493 | return; |
56be3814 | 494 | fetch_fpregs (regcache, tid); |
5c44784c JM |
495 | return; |
496 | } | |
d4f3574e | 497 | |
5c44784c JM |
498 | if (GETREGS_SUPPLIES (regno)) |
499 | { | |
56be3814 | 500 | fetch_regs (regcache, tid); |
5c44784c JM |
501 | return; |
502 | } | |
503 | ||
c131fcee L |
504 | if (GETXSTATEREGS_SUPPLIES (regno)) |
505 | { | |
506 | if (fetch_xstateregs (regcache, tid)) | |
507 | return; | |
508 | } | |
509 | ||
6ce2ac0b | 510 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 511 | { |
56be3814 | 512 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
513 | return; |
514 | ||
515 | /* Either our processor or our kernel doesn't support the SSE | |
516 | registers, so read the FP registers in the traditional way, | |
517 | and fill the SSE registers with dummy values. It would be | |
518 | more graceful to handle differences in the register set using | |
519 | gdbarch. Until then, this will at least make things work | |
520 | plausibly. */ | |
56be3814 | 521 | fetch_fpregs (regcache, tid); |
5c44784c JM |
522 | return; |
523 | } | |
524 | ||
8e65ff28 | 525 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 526 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
527 | } |
528 | ||
04cd15b6 MK |
529 | /* Store register REGNO back into the child process. If REGNO is -1, |
530 | do this for all registers (including the floating point and SSE | |
531 | registers). */ | |
10d6c8cd | 532 | static void |
28439f5e PA |
533 | i386_linux_store_inferior_registers (struct target_ops *ops, |
534 | struct regcache *regcache, int regno) | |
d4f3574e | 535 | { |
ed9a39eb JM |
536 | int tid; |
537 | ||
f60300e7 MK |
538 | /* Use the old method of poking around in `struct user' if the |
539 | SETREGS request isn't available. */ | |
ce556f85 | 540 | if (!have_ptrace_getregs) |
f60300e7 | 541 | { |
ce556f85 MK |
542 | int i; |
543 | ||
875f8d0e | 544 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 545 | if (regno == -1 || regno == i) |
56be3814 | 546 | store_register (regcache, i); |
ce556f85 | 547 | |
f60300e7 MK |
548 | return; |
549 | } | |
550 | ||
a4b6fc86 | 551 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 552 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 553 | if (tid == 0) |
dfd4cc63 | 554 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
ed9a39eb | 555 | |
6ce2ac0b | 556 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 557 | transfers more registers in one system call. But remember that |
6ce2ac0b | 558 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
559 | if (regno == -1) |
560 | { | |
56be3814 | 561 | store_regs (regcache, tid, regno); |
c131fcee L |
562 | if (store_xstateregs (regcache, tid, regno)) |
563 | return; | |
56be3814 | 564 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c | 565 | return; |
56be3814 | 566 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
567 | return; |
568 | } | |
d4f3574e | 569 | |
5c44784c JM |
570 | if (GETREGS_SUPPLIES (regno)) |
571 | { | |
56be3814 | 572 | store_regs (regcache, tid, regno); |
5c44784c JM |
573 | return; |
574 | } | |
575 | ||
c131fcee L |
576 | if (GETXSTATEREGS_SUPPLIES (regno)) |
577 | { | |
578 | if (store_xstateregs (regcache, tid, regno)) | |
579 | return; | |
580 | } | |
581 | ||
6ce2ac0b | 582 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 583 | { |
56be3814 | 584 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
585 | return; |
586 | ||
587 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
588 | registers, so just write the FP registers in the traditional |
589 | way. */ | |
56be3814 | 590 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
591 | return; |
592 | } | |
593 | ||
8e65ff28 | 594 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 595 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 596 | } |
de57eccd | 597 | \f |
6ce2ac0b | 598 | |
8c420b8d GB |
599 | /* Called by libthread_db. Returns a pointer to the thread local |
600 | storage (or its descriptor). */ | |
601 | ||
602 | ps_err_e | |
603 | ps_get_thread_area (const struct ps_prochandle *ph, | |
604 | lwpid_t lwpid, int idx, void **base) | |
605 | { | |
606 | unsigned int base_addr; | |
607 | ps_err_e result; | |
608 | ||
609 | result = x86_linux_get_thread_area (lwpid, (void *) idx, &base_addr); | |
610 | ||
611 | if (result == PS_OK) | |
612 | *(int *) base = base_addr; | |
613 | ||
614 | return result; | |
615 | } | |
5bca7895 MK |
616 | \f |
617 | ||
a4b6fc86 | 618 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
619 | int $0x80 |
620 | or 0xcd 0x80. */ | |
621 | ||
622 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
623 | ||
624 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
625 | ||
626 | /* The system call number is stored in the %eax register. */ | |
7532965f | 627 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
628 | |
629 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
630 | system calls. */ | |
631 | ||
632 | #ifndef SYS_sigreturn | |
633 | #define SYS_sigreturn 0x77 | |
634 | #endif | |
635 | #ifndef SYS_rt_sigreturn | |
636 | #define SYS_rt_sigreturn 0xad | |
637 | #endif | |
638 | ||
639 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
640 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
641 | ||
642 | /* Resume execution of the inferior process. | |
643 | If STEP is nonzero, single-step it. | |
644 | If SIGNAL is nonzero, give it that signal. */ | |
645 | ||
10d6c8cd | 646 | static void |
28439f5e | 647 | i386_linux_resume (struct target_ops *ops, |
2ea28649 | 648 | ptid_t ptid, int step, enum gdb_signal signal) |
a6abb2c0 | 649 | { |
dfd4cc63 | 650 | int pid = ptid_get_pid (ptid); |
39f77062 | 651 | |
a96d9b2e SDJ |
652 | int request; |
653 | ||
654 | if (catch_syscall_enabled () > 0) | |
655 | request = PTRACE_SYSCALL; | |
656 | else | |
657 | request = PTRACE_CONT; | |
a6abb2c0 | 658 | |
a6abb2c0 MK |
659 | if (step) |
660 | { | |
594f7785 | 661 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
e17a4113 UW |
662 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
663 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7b86a1b8 | 664 | ULONGEST pc; |
8e70166d | 665 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
666 | |
667 | request = PTRACE_SINGLESTEP; | |
668 | ||
e17a4113 UW |
669 | regcache_cooked_read_unsigned (regcache, |
670 | gdbarch_pc_regnum (gdbarch), &pc); | |
7b86a1b8 | 671 | |
a6abb2c0 MK |
672 | /* Returning from a signal trampoline is done by calling a |
673 | special system call (sigreturn or rt_sigreturn, see | |
674 | i386-linux-tdep.c for more information). This system call | |
675 | restores the registers that were saved when the signal was | |
676 | raised, including %eflags. That means that single-stepping | |
677 | won't work. Instead, we'll have to modify the signal context | |
678 | that's about to be restored, and set the trace flag there. */ | |
679 | ||
680 | /* First check if PC is at a system call. */ | |
8defab1a | 681 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
682 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
683 | { | |
7b86a1b8 UW |
684 | ULONGEST syscall; |
685 | regcache_cooked_read_unsigned (regcache, | |
686 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
687 | |
688 | /* Then check the system call number. */ | |
689 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
690 | { | |
7b86a1b8 | 691 | ULONGEST sp, addr; |
a6abb2c0 | 692 | unsigned long int eflags; |
7bf0983e | 693 | |
7b86a1b8 | 694 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 | 695 | if (syscall == SYS_rt_sigreturn) |
f3d6df6d YQ |
696 | addr = read_memory_unsigned_integer (sp + 8, 4, byte_order) |
697 | + 20; | |
7b86a1b8 UW |
698 | else |
699 | addr = sp; | |
a6abb2c0 MK |
700 | |
701 | /* Set the trace flag in the context that's about to be | |
702 | restored. */ | |
703 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 704 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 705 | eflags |= 0x0100; |
8e70166d | 706 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
707 | } |
708 | } | |
709 | } | |
710 | ||
2ea28649 | 711 | if (ptrace (request, pid, 0, gdb_signal_to_host (signal)) == -1) |
e2e0b3e5 | 712 | perror_with_name (("ptrace")); |
a6abb2c0 | 713 | } |
040baaf6 | 714 | \f |
c1e246a0 GB |
715 | |
716 | /* -Wmissing-prototypes */ | |
717 | extern initialize_file_ftype _initialize_i386_linux_nat; | |
718 | ||
719 | void | |
720 | _initialize_i386_linux_nat (void) | |
721 | { | |
722 | /* Create a generic x86 GNU/Linux target. */ | |
723 | struct target_ops *t = x86_linux_create_target (); | |
724 | ||
725 | /* Override the default ptrace resume method. */ | |
726 | t->to_resume = i386_linux_resume; | |
727 | ||
728 | /* Add our register access methods. */ | |
729 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
730 | t->to_store_registers = i386_linux_store_inferior_registers; | |
731 | ||
732 | /* Add the target. */ | |
733 | x86_linux_add_target (t); | |
734 | } |