Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
32d0add0 | 3 | Copyright (C) 1999-2015 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> |
72fde3df | 26 | #include <sys/uio.h> |
c60c0f5f | 27 | #include "gregset.h" |
3116063b | 28 | #include "gdb_proc_service.h" |
c60c0f5f | 29 | |
3116063b | 30 | #include "i386-linux-nat.h" |
e750d25e | 31 | #include "i387-tdep.h" |
c3833324 | 32 | #include "i386-tdep.h" |
5179e78f | 33 | #include "i386-linux-tdep.h" |
df7e5265 | 34 | #include "x86-xstate.h" |
c131fcee | 35 | |
8d683210 | 36 | #include "linux-nat.h" |
040baaf6 | 37 | #include "x86-linux-nat.h" |
ca9b78ce | 38 | #include "nat/linux-ptrace.h" |
d4f3574e | 39 | |
a4b6fc86 AC |
40 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
41 | the register sets in `struct user' that is used for a.out | |
42 | core-dumps, and is also used by `ptrace'. The corresponding types | |
43 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
44 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
45 | for the floating-point registers. | |
46 | ||
47 | Those types used to be available under the names `gregset_t' and | |
48 | `fpregset_t' too, and this file used those names in the past. But | |
49 | those names are now used for the register sets used in the | |
50 | `mcontext_t' type, and have a different size and layout. */ | |
51 | ||
5c44784c JM |
52 | /* Which ptrace request retrieves which registers? |
53 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 54 | |
5c44784c | 55 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 56 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 57 | |
6ce2ac0b | 58 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 59 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 60 | |
c131fcee | 61 | #define GETXSTATEREGS_SUPPLIES(regno) \ |
01f9f808 | 62 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX512_NUM_REGS) |
c131fcee | 63 | |
f60300e7 MK |
64 | /* Does the current host support the GETREGS request? */ |
65 | int have_ptrace_getregs = | |
66 | #ifdef HAVE_PTRACE_GETREGS | |
67 | 1 | |
68 | #else | |
69 | 0 | |
70 | #endif | |
71 | ; | |
72 | ||
6ce2ac0b | 73 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
74 | file may or may not define it, and even if it is defined, the |
75 | kernel will return EIO if it's running on a pre-SSE processor. | |
76 | ||
77 | My instinct is to attach this to some architecture- or | |
78 | target-specific data structure, but really, a particular GDB | |
79 | process can only run on top of one kernel at a time. So it's okay | |
80 | for this to be a simple variable. */ | |
6ce2ac0b MK |
81 | int have_ptrace_getfpxregs = |
82 | #ifdef HAVE_PTRACE_GETFPXREGS | |
3a13a53b | 83 | -1 |
5c44784c JM |
84 | #else |
85 | 0 | |
86 | #endif | |
87 | ; | |
f60300e7 | 88 | \f |
6ce2ac0b | 89 | |
ce556f85 | 90 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
91 | |
92 | /* Fetch one register. */ | |
93 | ||
94 | static void | |
56be3814 | 95 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 96 | { |
f60300e7 | 97 | int tid; |
ce556f85 | 98 | int val; |
f60300e7 | 99 | |
ce556f85 | 100 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 101 | if (i386_linux_gregset_reg_offset[regno] == -1) |
f60300e7 | 102 | { |
56be3814 | 103 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
104 | return; |
105 | } | |
106 | ||
ce556f85 | 107 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 108 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 109 | if (tid == 0) |
dfd4cc63 | 110 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 111 | |
ce556f85 | 112 | errno = 0; |
be0d2954 L |
113 | val = ptrace (PTRACE_PEEKUSER, tid, |
114 | i386_linux_gregset_reg_offset[regno], 0); | |
ce556f85 | 115 | if (errno != 0) |
c9f4d572 | 116 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 117 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 118 | regno, safe_strerror (errno)); |
f60300e7 | 119 | |
56be3814 | 120 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
121 | } |
122 | ||
1777feb0 | 123 | /* Store one register. */ |
f60300e7 MK |
124 | |
125 | static void | |
56be3814 | 126 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 127 | { |
f60300e7 | 128 | int tid; |
ce556f85 | 129 | int val; |
f60300e7 | 130 | |
ce556f85 | 131 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 132 | if (i386_linux_gregset_reg_offset[regno] == -1) |
ce556f85 | 133 | return; |
f60300e7 | 134 | |
ce556f85 | 135 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 136 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 137 | if (tid == 0) |
dfd4cc63 | 138 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 139 | |
ce556f85 | 140 | errno = 0; |
56be3814 | 141 | regcache_raw_collect (regcache, regno, &val); |
be0d2954 L |
142 | ptrace (PTRACE_POKEUSER, tid, |
143 | i386_linux_gregset_reg_offset[regno], val); | |
ce556f85 | 144 | if (errno != 0) |
c9f4d572 | 145 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 146 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 147 | regno, safe_strerror (errno)); |
f60300e7 | 148 | } |
5c44784c | 149 | \f |
6ce2ac0b | 150 | |
04cd15b6 MK |
151 | /* Transfering the general-purpose registers between GDB, inferiors |
152 | and core files. */ | |
153 | ||
ad2a4d09 | 154 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 155 | in *GREGSETP. */ |
5c44784c | 156 | |
d4f3574e | 157 | void |
7f7fe91e | 158 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 159 | { |
be0d2954 | 160 | const gdb_byte *regp = (const gdb_byte *) gregsetp; |
6ce2ac0b | 161 | int i; |
d4f3574e | 162 | |
98df6387 | 163 | for (i = 0; i < I386_NUM_GREGS; i++) |
be0d2954 L |
164 | regcache_raw_supply (regcache, i, |
165 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 166 | |
875f8d0e UW |
167 | if (I386_LINUX_ORIG_EAX_REGNUM |
168 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
169 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
170 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
917317f4 JM |
171 | } |
172 | ||
04cd15b6 MK |
173 | /* Fill register REGNO (if it is a general-purpose register) in |
174 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
175 | do this for all registers. */ | |
6ce2ac0b | 176 | |
917317f4 | 177 | void |
7f7fe91e UW |
178 | fill_gregset (const struct regcache *regcache, |
179 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 180 | { |
be0d2954 | 181 | gdb_byte *regp = (gdb_byte *) gregsetp; |
6ce2ac0b | 182 | int i; |
04cd15b6 | 183 | |
98df6387 | 184 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 185 | if (regno == -1 || regno == i) |
be0d2954 L |
186 | regcache_raw_collect (regcache, i, |
187 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 188 | |
82ea117a | 189 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
190 | && I386_LINUX_ORIG_EAX_REGNUM |
191 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
192 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
193 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
d4f3574e SS |
194 | } |
195 | ||
f60300e7 MK |
196 | #ifdef HAVE_PTRACE_GETREGS |
197 | ||
04cd15b6 MK |
198 | /* Fetch all general-purpose registers from process/thread TID and |
199 | store their values in GDB's register array. */ | |
d4f3574e | 200 | |
5c44784c | 201 | static void |
56be3814 | 202 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 203 | { |
04cd15b6 | 204 | elf_gregset_t regs; |
2e024c20 | 205 | elf_gregset_t *regs_p = ®s; |
5c44784c | 206 | |
6ce2ac0b | 207 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 208 | { |
f60300e7 MK |
209 | if (errno == EIO) |
210 | { | |
211 | /* The kernel we're running on doesn't support the GETREGS | |
212 | request. Reset `have_ptrace_getregs'. */ | |
213 | have_ptrace_getregs = 0; | |
214 | return; | |
215 | } | |
216 | ||
e2e0b3e5 | 217 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
218 | } |
219 | ||
2e024c20 | 220 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
221 | } |
222 | ||
04cd15b6 MK |
223 | /* Store all valid general-purpose registers in GDB's register array |
224 | into the process/thread specified by TID. */ | |
5c44784c | 225 | |
5c44784c | 226 | static void |
56be3814 | 227 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 228 | { |
04cd15b6 | 229 | elf_gregset_t regs; |
5c44784c | 230 | |
6ce2ac0b | 231 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 232 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 233 | |
56be3814 | 234 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
235 | |
236 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 237 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
238 | } |
239 | ||
f60300e7 MK |
240 | #else |
241 | ||
56be3814 UW |
242 | static void fetch_regs (struct regcache *regcache, int tid) {} |
243 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
244 | |
245 | #endif | |
5c44784c | 246 | \f |
5c44784c | 247 | |
6ce2ac0b | 248 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 249 | |
04cd15b6 | 250 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 251 | *FPREGSETP. */ |
04cd15b6 | 252 | |
d4f3574e | 253 | void |
7f7fe91e | 254 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 255 | { |
7f7fe91e | 256 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 257 | } |
d4f3574e | 258 | |
04cd15b6 MK |
259 | /* Fill register REGNO (if it is a floating-point register) in |
260 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
261 | do this for all registers. */ | |
917317f4 JM |
262 | |
263 | void | |
7f7fe91e UW |
264 | fill_fpregset (const struct regcache *regcache, |
265 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 266 | { |
7f7fe91e | 267 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
268 | } |
269 | ||
f60300e7 MK |
270 | #ifdef HAVE_PTRACE_GETREGS |
271 | ||
04cd15b6 MK |
272 | /* Fetch all floating-point registers from process/thread TID and store |
273 | thier values in GDB's register array. */ | |
917317f4 | 274 | |
d4f3574e | 275 | static void |
56be3814 | 276 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 277 | { |
04cd15b6 | 278 | elf_fpregset_t fpregs; |
d4f3574e | 279 | |
6ce2ac0b | 280 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 281 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 282 | |
56be3814 | 283 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
284 | } |
285 | ||
04cd15b6 MK |
286 | /* Store all valid floating-point registers in GDB's register array |
287 | into the process/thread specified by TID. */ | |
d4f3574e | 288 | |
d4f3574e | 289 | static void |
56be3814 | 290 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 291 | { |
04cd15b6 | 292 | elf_fpregset_t fpregs; |
d4f3574e | 293 | |
6ce2ac0b | 294 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 295 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 296 | |
56be3814 | 297 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 298 | |
6ce2ac0b | 299 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 300 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
301 | } |
302 | ||
f60300e7 MK |
303 | #else |
304 | ||
1777feb0 MS |
305 | static void |
306 | fetch_fpregs (struct regcache *regcache, int tid) | |
307 | { | |
308 | } | |
309 | ||
310 | static void | |
311 | store_fpregs (const struct regcache *regcache, int tid, int regno) | |
312 | { | |
313 | } | |
f60300e7 MK |
314 | |
315 | #endif | |
5c44784c | 316 | \f |
d4f3574e | 317 | |
6ce2ac0b | 318 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 319 | |
c131fcee L |
320 | /* Fetch all registers covered by the PTRACE_GETREGSET request from |
321 | process/thread TID and store their values in GDB's register array. | |
322 | Return non-zero if successful, zero otherwise. */ | |
323 | ||
324 | static int | |
325 | fetch_xstateregs (struct regcache *regcache, int tid) | |
326 | { | |
df7e5265 | 327 | char xstateregs[X86_XSTATE_MAX_SIZE]; |
c131fcee L |
328 | struct iovec iov; |
329 | ||
330 | if (!have_ptrace_getregset) | |
331 | return 0; | |
332 | ||
333 | iov.iov_base = xstateregs; | |
334 | iov.iov_len = sizeof(xstateregs); | |
335 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
336 | &iov) < 0) | |
337 | perror_with_name (_("Couldn't read extended state status")); | |
338 | ||
339 | i387_supply_xsave (regcache, -1, xstateregs); | |
340 | return 1; | |
341 | } | |
342 | ||
343 | /* Store all valid registers in GDB's register array covered by the | |
344 | PTRACE_SETREGSET request into the process/thread specified by TID. | |
345 | Return non-zero if successful, zero otherwise. */ | |
346 | ||
347 | static int | |
348 | store_xstateregs (const struct regcache *regcache, int tid, int regno) | |
349 | { | |
df7e5265 | 350 | char xstateregs[X86_XSTATE_MAX_SIZE]; |
c131fcee L |
351 | struct iovec iov; |
352 | ||
353 | if (!have_ptrace_getregset) | |
354 | return 0; | |
355 | ||
356 | iov.iov_base = xstateregs; | |
357 | iov.iov_len = sizeof(xstateregs); | |
358 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
359 | &iov) < 0) | |
360 | perror_with_name (_("Couldn't read extended state status")); | |
361 | ||
362 | i387_collect_xsave (regcache, regno, xstateregs, 0); | |
363 | ||
364 | if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
365 | (int) &iov) < 0) | |
366 | perror_with_name (_("Couldn't write extended state status")); | |
367 | ||
368 | return 1; | |
369 | } | |
370 | ||
6ce2ac0b | 371 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 | 372 | |
6ce2ac0b | 373 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
374 | process/thread TID and store their values in GDB's register array. |
375 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 376 | |
5c44784c | 377 | static int |
56be3814 | 378 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 379 | { |
6ce2ac0b | 380 | elf_fpxregset_t fpxregs; |
5c44784c | 381 | |
6ce2ac0b | 382 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
383 | return 0; |
384 | ||
6ce2ac0b | 385 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 386 | { |
5c44784c JM |
387 | if (errno == EIO) |
388 | { | |
6ce2ac0b | 389 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
390 | return 0; |
391 | } | |
392 | ||
e2e0b3e5 | 393 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
394 | } |
395 | ||
b7a8b4ef | 396 | i387_supply_fxsave (regcache, -1, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
397 | return 1; |
398 | } | |
d4f3574e | 399 | |
04cd15b6 | 400 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 401 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 402 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 403 | |
5c44784c | 404 | static int |
56be3814 | 405 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 406 | { |
6ce2ac0b | 407 | elf_fpxregset_t fpxregs; |
5c44784c | 408 | |
6ce2ac0b | 409 | if (! have_ptrace_getfpxregs) |
5c44784c | 410 | return 0; |
6ce2ac0b MK |
411 | |
412 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
413 | { |
414 | if (errno == EIO) | |
415 | { | |
416 | have_ptrace_getfpxregs = 0; | |
417 | return 0; | |
418 | } | |
419 | ||
e2e0b3e5 | 420 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 421 | } |
5c44784c | 422 | |
b7a8b4ef | 423 | i387_collect_fxsave (regcache, regno, &fpxregs); |
5c44784c | 424 | |
6ce2ac0b | 425 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 426 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
427 | |
428 | return 1; | |
429 | } | |
430 | ||
5c44784c JM |
431 | #else |
432 | ||
1777feb0 MS |
433 | static int |
434 | fetch_fpxregs (struct regcache *regcache, int tid) | |
435 | { | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static int | |
440 | store_fpxregs (const struct regcache *regcache, int tid, int regno) | |
441 | { | |
442 | return 0; | |
443 | } | |
5c44784c | 444 | |
6ce2ac0b | 445 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 446 | \f |
6ce2ac0b | 447 | |
5c44784c | 448 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 449 | |
04cd15b6 MK |
450 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
451 | this for all registers (including the floating point and SSE | |
452 | registers). */ | |
d4f3574e | 453 | |
10d6c8cd | 454 | static void |
28439f5e PA |
455 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
456 | struct regcache *regcache, int regno) | |
d4f3574e | 457 | { |
ed9a39eb JM |
458 | int tid; |
459 | ||
f60300e7 MK |
460 | /* Use the old method of peeking around in `struct user' if the |
461 | GETREGS request isn't available. */ | |
ce556f85 | 462 | if (!have_ptrace_getregs) |
f60300e7 | 463 | { |
ce556f85 MK |
464 | int i; |
465 | ||
875f8d0e | 466 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 467 | if (regno == -1 || regno == i) |
56be3814 | 468 | fetch_register (regcache, i); |
ce556f85 | 469 | |
f60300e7 MK |
470 | return; |
471 | } | |
472 | ||
a4b6fc86 | 473 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 474 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 475 | if (tid == 0) |
dfd4cc63 | 476 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
ed9a39eb | 477 | |
6ce2ac0b | 478 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 479 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 480 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 481 | zero. */ |
5c44784c JM |
482 | if (regno == -1) |
483 | { | |
56be3814 | 484 | fetch_regs (regcache, tid); |
f60300e7 MK |
485 | |
486 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 487 | if (!have_ptrace_getregs) |
f60300e7 | 488 | { |
84e473c8 | 489 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
490 | return; |
491 | } | |
492 | ||
c131fcee L |
493 | if (fetch_xstateregs (regcache, tid)) |
494 | return; | |
56be3814 | 495 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 496 | return; |
56be3814 | 497 | fetch_fpregs (regcache, tid); |
5c44784c JM |
498 | return; |
499 | } | |
d4f3574e | 500 | |
5c44784c JM |
501 | if (GETREGS_SUPPLIES (regno)) |
502 | { | |
56be3814 | 503 | fetch_regs (regcache, tid); |
5c44784c JM |
504 | return; |
505 | } | |
506 | ||
c131fcee L |
507 | if (GETXSTATEREGS_SUPPLIES (regno)) |
508 | { | |
509 | if (fetch_xstateregs (regcache, tid)) | |
510 | return; | |
511 | } | |
512 | ||
6ce2ac0b | 513 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 514 | { |
56be3814 | 515 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
516 | return; |
517 | ||
518 | /* Either our processor or our kernel doesn't support the SSE | |
519 | registers, so read the FP registers in the traditional way, | |
520 | and fill the SSE registers with dummy values. It would be | |
521 | more graceful to handle differences in the register set using | |
522 | gdbarch. Until then, this will at least make things work | |
523 | plausibly. */ | |
56be3814 | 524 | fetch_fpregs (regcache, tid); |
5c44784c JM |
525 | return; |
526 | } | |
527 | ||
8e65ff28 | 528 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 529 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
530 | } |
531 | ||
04cd15b6 MK |
532 | /* Store register REGNO back into the child process. If REGNO is -1, |
533 | do this for all registers (including the floating point and SSE | |
534 | registers). */ | |
10d6c8cd | 535 | static void |
28439f5e PA |
536 | i386_linux_store_inferior_registers (struct target_ops *ops, |
537 | struct regcache *regcache, int regno) | |
d4f3574e | 538 | { |
ed9a39eb JM |
539 | int tid; |
540 | ||
f60300e7 MK |
541 | /* Use the old method of poking around in `struct user' if the |
542 | SETREGS request isn't available. */ | |
ce556f85 | 543 | if (!have_ptrace_getregs) |
f60300e7 | 544 | { |
ce556f85 MK |
545 | int i; |
546 | ||
875f8d0e | 547 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 548 | if (regno == -1 || regno == i) |
56be3814 | 549 | store_register (regcache, i); |
ce556f85 | 550 | |
f60300e7 MK |
551 | return; |
552 | } | |
553 | ||
a4b6fc86 | 554 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 555 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 556 | if (tid == 0) |
dfd4cc63 | 557 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
ed9a39eb | 558 | |
6ce2ac0b | 559 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 560 | transfers more registers in one system call. But remember that |
6ce2ac0b | 561 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
562 | if (regno == -1) |
563 | { | |
56be3814 | 564 | store_regs (regcache, tid, regno); |
c131fcee L |
565 | if (store_xstateregs (regcache, tid, regno)) |
566 | return; | |
56be3814 | 567 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c | 568 | return; |
56be3814 | 569 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
570 | return; |
571 | } | |
d4f3574e | 572 | |
5c44784c JM |
573 | if (GETREGS_SUPPLIES (regno)) |
574 | { | |
56be3814 | 575 | store_regs (regcache, tid, regno); |
5c44784c JM |
576 | return; |
577 | } | |
578 | ||
c131fcee L |
579 | if (GETXSTATEREGS_SUPPLIES (regno)) |
580 | { | |
581 | if (store_xstateregs (regcache, tid, regno)) | |
582 | return; | |
583 | } | |
584 | ||
6ce2ac0b | 585 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 586 | { |
56be3814 | 587 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
588 | return; |
589 | ||
590 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
591 | registers, so just write the FP registers in the traditional |
592 | way. */ | |
56be3814 | 593 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
594 | return; |
595 | } | |
596 | ||
8e65ff28 | 597 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 598 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 599 | } |
de57eccd | 600 | \f |
6ce2ac0b | 601 | |
8c420b8d GB |
602 | /* Called by libthread_db. Returns a pointer to the thread local |
603 | storage (or its descriptor). */ | |
604 | ||
605 | ps_err_e | |
606 | ps_get_thread_area (const struct ps_prochandle *ph, | |
607 | lwpid_t lwpid, int idx, void **base) | |
608 | { | |
609 | unsigned int base_addr; | |
610 | ps_err_e result; | |
611 | ||
612 | result = x86_linux_get_thread_area (lwpid, (void *) idx, &base_addr); | |
613 | ||
614 | if (result == PS_OK) | |
615 | *(int *) base = base_addr; | |
616 | ||
617 | return result; | |
618 | } | |
5bca7895 MK |
619 | \f |
620 | ||
a4b6fc86 | 621 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
622 | int $0x80 |
623 | or 0xcd 0x80. */ | |
624 | ||
625 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
626 | ||
627 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
628 | ||
629 | /* The system call number is stored in the %eax register. */ | |
7532965f | 630 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
631 | |
632 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
633 | system calls. */ | |
634 | ||
635 | #ifndef SYS_sigreturn | |
636 | #define SYS_sigreturn 0x77 | |
637 | #endif | |
638 | #ifndef SYS_rt_sigreturn | |
639 | #define SYS_rt_sigreturn 0xad | |
640 | #endif | |
641 | ||
642 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
643 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
644 | ||
645 | /* Resume execution of the inferior process. | |
646 | If STEP is nonzero, single-step it. | |
647 | If SIGNAL is nonzero, give it that signal. */ | |
648 | ||
10d6c8cd | 649 | static void |
28439f5e | 650 | i386_linux_resume (struct target_ops *ops, |
2ea28649 | 651 | ptid_t ptid, int step, enum gdb_signal signal) |
a6abb2c0 | 652 | { |
90ad5e1d | 653 | int pid = ptid_get_lwp (ptid); |
a96d9b2e SDJ |
654 | int request; |
655 | ||
656 | if (catch_syscall_enabled () > 0) | |
657 | request = PTRACE_SYSCALL; | |
658 | else | |
659 | request = PTRACE_CONT; | |
a6abb2c0 | 660 | |
a6abb2c0 MK |
661 | if (step) |
662 | { | |
90ad5e1d | 663 | struct regcache *regcache = get_thread_regcache (ptid); |
e17a4113 UW |
664 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
665 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7b86a1b8 | 666 | ULONGEST pc; |
8e70166d | 667 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
668 | |
669 | request = PTRACE_SINGLESTEP; | |
670 | ||
e17a4113 UW |
671 | regcache_cooked_read_unsigned (regcache, |
672 | gdbarch_pc_regnum (gdbarch), &pc); | |
7b86a1b8 | 673 | |
a6abb2c0 MK |
674 | /* Returning from a signal trampoline is done by calling a |
675 | special system call (sigreturn or rt_sigreturn, see | |
676 | i386-linux-tdep.c for more information). This system call | |
677 | restores the registers that were saved when the signal was | |
678 | raised, including %eflags. That means that single-stepping | |
679 | won't work. Instead, we'll have to modify the signal context | |
680 | that's about to be restored, and set the trace flag there. */ | |
681 | ||
682 | /* First check if PC is at a system call. */ | |
8defab1a | 683 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
684 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
685 | { | |
7b86a1b8 UW |
686 | ULONGEST syscall; |
687 | regcache_cooked_read_unsigned (regcache, | |
688 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
689 | |
690 | /* Then check the system call number. */ | |
691 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
692 | { | |
7b86a1b8 | 693 | ULONGEST sp, addr; |
a6abb2c0 | 694 | unsigned long int eflags; |
7bf0983e | 695 | |
7b86a1b8 | 696 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 | 697 | if (syscall == SYS_rt_sigreturn) |
f3d6df6d YQ |
698 | addr = read_memory_unsigned_integer (sp + 8, 4, byte_order) |
699 | + 20; | |
7b86a1b8 UW |
700 | else |
701 | addr = sp; | |
a6abb2c0 MK |
702 | |
703 | /* Set the trace flag in the context that's about to be | |
704 | restored. */ | |
705 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 706 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 707 | eflags |= 0x0100; |
8e70166d | 708 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
709 | } |
710 | } | |
711 | } | |
712 | ||
2ea28649 | 713 | if (ptrace (request, pid, 0, gdb_signal_to_host (signal)) == -1) |
e2e0b3e5 | 714 | perror_with_name (("ptrace")); |
a6abb2c0 | 715 | } |
040baaf6 | 716 | \f |
c1e246a0 GB |
717 | |
718 | /* -Wmissing-prototypes */ | |
719 | extern initialize_file_ftype _initialize_i386_linux_nat; | |
720 | ||
721 | void | |
722 | _initialize_i386_linux_nat (void) | |
723 | { | |
724 | /* Create a generic x86 GNU/Linux target. */ | |
725 | struct target_ops *t = x86_linux_create_target (); | |
726 | ||
727 | /* Override the default ptrace resume method. */ | |
728 | t->to_resume = i386_linux_resume; | |
729 | ||
730 | /* Add our register access methods. */ | |
731 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
732 | t->to_store_registers = i386_linux_store_inferior_registers; | |
733 | ||
734 | /* Add the target. */ | |
735 | x86_linux_add_target (t); | |
736 | } |