Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
28e7fd62 | 3 | Copyright (C) 1999-2013 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" | |
9bb9e8ad | 21 | #include "i386-nat.h" |
d4f3574e SS |
22 | #include "inferior.h" |
23 | #include "gdbcore.h" | |
4e052eda | 24 | #include "regcache.h" |
c131fcee | 25 | #include "regset.h" |
10d6c8cd | 26 | #include "target.h" |
4de4c07c | 27 | #include "linux-nat.h" |
3e3aea48 MM |
28 | #include "linux-btrace.h" |
29 | #include "btrace.h" | |
d4f3574e | 30 | |
84346e11 | 31 | #include "gdb_assert.h" |
309367d4 | 32 | #include "gdb_string.h" |
c131fcee L |
33 | #include "elf/common.h" |
34 | #include <sys/uio.h> | |
d4f3574e SS |
35 | #include <sys/ptrace.h> |
36 | #include <sys/user.h> | |
37 | #include <sys/procfs.h> | |
38 | ||
39 | #ifdef HAVE_SYS_REG_H | |
40 | #include <sys/reg.h> | |
41 | #endif | |
42 | ||
ce556f85 MK |
43 | #ifndef ORIG_EAX |
44 | #define ORIG_EAX -1 | |
45 | #endif | |
46 | ||
84346e11 MK |
47 | #ifdef HAVE_SYS_DEBUGREG_H |
48 | #include <sys/debugreg.h> | |
49 | #endif | |
50 | ||
6ce2ac0b | 51 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
52 | #include "gregset.h" |
53 | ||
e750d25e | 54 | #include "i387-tdep.h" |
c3833324 | 55 | #include "i386-tdep.h" |
5179e78f AC |
56 | #include "i386-linux-tdep.h" |
57 | ||
b757528f JJ |
58 | /* Defines ps_err_e, struct ps_prochandle. */ |
59 | #include "gdb_proc_service.h" | |
c131fcee L |
60 | |
61 | #include "i386-xstate.h" | |
62 | ||
63 | #ifndef PTRACE_GETREGSET | |
64 | #define PTRACE_GETREGSET 0x4204 | |
65 | #endif | |
66 | ||
67 | #ifndef PTRACE_SETREGSET | |
68 | #define PTRACE_SETREGSET 0x4205 | |
69 | #endif | |
70 | ||
7b50312a PA |
71 | /* Per-thread arch-specific data we want to keep. */ |
72 | ||
73 | struct arch_lwp_info | |
74 | { | |
75 | /* Non-zero if our copy differs from what's recorded in the thread. */ | |
76 | int debug_registers_changed; | |
77 | }; | |
78 | ||
c131fcee L |
79 | /* Does the current host support PTRACE_GETREGSET? */ |
80 | static int have_ptrace_getregset = -1; | |
6ce2ac0b | 81 | \f |
d4f3574e | 82 | |
a4b6fc86 AC |
83 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
84 | the register sets in `struct user' that is used for a.out | |
85 | core-dumps, and is also used by `ptrace'. The corresponding types | |
86 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
87 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
88 | for the floating-point registers. | |
89 | ||
90 | Those types used to be available under the names `gregset_t' and | |
91 | `fpregset_t' too, and this file used those names in the past. But | |
92 | those names are now used for the register sets used in the | |
93 | `mcontext_t' type, and have a different size and layout. */ | |
94 | ||
5c44784c JM |
95 | /* Which ptrace request retrieves which registers? |
96 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 97 | |
5c44784c | 98 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 99 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 100 | |
6ce2ac0b | 101 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 102 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 103 | |
c131fcee L |
104 | #define GETXSTATEREGS_SUPPLIES(regno) \ |
105 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX_NUM_REGS) | |
106 | ||
f60300e7 MK |
107 | /* Does the current host support the GETREGS request? */ |
108 | int have_ptrace_getregs = | |
109 | #ifdef HAVE_PTRACE_GETREGS | |
110 | 1 | |
111 | #else | |
112 | 0 | |
113 | #endif | |
114 | ; | |
115 | ||
6ce2ac0b | 116 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
117 | file may or may not define it, and even if it is defined, the |
118 | kernel will return EIO if it's running on a pre-SSE processor. | |
119 | ||
120 | My instinct is to attach this to some architecture- or | |
121 | target-specific data structure, but really, a particular GDB | |
122 | process can only run on top of one kernel at a time. So it's okay | |
123 | for this to be a simple variable. */ | |
6ce2ac0b MK |
124 | int have_ptrace_getfpxregs = |
125 | #ifdef HAVE_PTRACE_GETFPXREGS | |
3a13a53b | 126 | -1 |
5c44784c JM |
127 | #else |
128 | 0 | |
129 | #endif | |
130 | ; | |
f60300e7 | 131 | \f |
6ce2ac0b | 132 | |
ce556f85 | 133 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
134 | |
135 | /* Fetch one register. */ | |
136 | ||
137 | static void | |
56be3814 | 138 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 139 | { |
f60300e7 | 140 | int tid; |
ce556f85 | 141 | int val; |
f60300e7 | 142 | |
ce556f85 | 143 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 144 | if (i386_linux_gregset_reg_offset[regno] == -1) |
f60300e7 | 145 | { |
56be3814 | 146 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
147 | return; |
148 | } | |
149 | ||
ce556f85 | 150 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 151 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 152 | if (tid == 0) |
dfd4cc63 | 153 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 154 | |
ce556f85 | 155 | errno = 0; |
be0d2954 L |
156 | val = ptrace (PTRACE_PEEKUSER, tid, |
157 | i386_linux_gregset_reg_offset[regno], 0); | |
ce556f85 | 158 | if (errno != 0) |
c9f4d572 | 159 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 160 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 161 | regno, safe_strerror (errno)); |
f60300e7 | 162 | |
56be3814 | 163 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
164 | } |
165 | ||
1777feb0 | 166 | /* Store one register. */ |
f60300e7 MK |
167 | |
168 | static void | |
56be3814 | 169 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 170 | { |
f60300e7 | 171 | int tid; |
ce556f85 | 172 | int val; |
f60300e7 | 173 | |
ce556f85 | 174 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 175 | if (i386_linux_gregset_reg_offset[regno] == -1) |
ce556f85 | 176 | return; |
f60300e7 | 177 | |
ce556f85 | 178 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 179 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 180 | if (tid == 0) |
dfd4cc63 | 181 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 182 | |
ce556f85 | 183 | errno = 0; |
56be3814 | 184 | regcache_raw_collect (regcache, regno, &val); |
be0d2954 L |
185 | ptrace (PTRACE_POKEUSER, tid, |
186 | i386_linux_gregset_reg_offset[regno], val); | |
ce556f85 | 187 | if (errno != 0) |
c9f4d572 | 188 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 189 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 190 | regno, safe_strerror (errno)); |
f60300e7 | 191 | } |
5c44784c | 192 | \f |
6ce2ac0b | 193 | |
04cd15b6 MK |
194 | /* Transfering the general-purpose registers between GDB, inferiors |
195 | and core files. */ | |
196 | ||
ad2a4d09 | 197 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 198 | in *GREGSETP. */ |
5c44784c | 199 | |
d4f3574e | 200 | void |
7f7fe91e | 201 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 202 | { |
be0d2954 | 203 | const gdb_byte *regp = (const gdb_byte *) gregsetp; |
6ce2ac0b | 204 | int i; |
d4f3574e | 205 | |
98df6387 | 206 | for (i = 0; i < I386_NUM_GREGS; i++) |
be0d2954 L |
207 | regcache_raw_supply (regcache, i, |
208 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 209 | |
875f8d0e UW |
210 | if (I386_LINUX_ORIG_EAX_REGNUM |
211 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
212 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
213 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
917317f4 JM |
214 | } |
215 | ||
04cd15b6 MK |
216 | /* Fill register REGNO (if it is a general-purpose register) in |
217 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
218 | do this for all registers. */ | |
6ce2ac0b | 219 | |
917317f4 | 220 | void |
7f7fe91e UW |
221 | fill_gregset (const struct regcache *regcache, |
222 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 223 | { |
be0d2954 | 224 | gdb_byte *regp = (gdb_byte *) gregsetp; |
6ce2ac0b | 225 | int i; |
04cd15b6 | 226 | |
98df6387 | 227 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 228 | if (regno == -1 || regno == i) |
be0d2954 L |
229 | regcache_raw_collect (regcache, i, |
230 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 231 | |
82ea117a | 232 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
233 | && I386_LINUX_ORIG_EAX_REGNUM |
234 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
235 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
236 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
d4f3574e SS |
237 | } |
238 | ||
f60300e7 MK |
239 | #ifdef HAVE_PTRACE_GETREGS |
240 | ||
04cd15b6 MK |
241 | /* Fetch all general-purpose registers from process/thread TID and |
242 | store their values in GDB's register array. */ | |
d4f3574e | 243 | |
5c44784c | 244 | static void |
56be3814 | 245 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 246 | { |
04cd15b6 | 247 | elf_gregset_t regs; |
2e024c20 | 248 | elf_gregset_t *regs_p = ®s; |
5c44784c | 249 | |
6ce2ac0b | 250 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 251 | { |
f60300e7 MK |
252 | if (errno == EIO) |
253 | { | |
254 | /* The kernel we're running on doesn't support the GETREGS | |
255 | request. Reset `have_ptrace_getregs'. */ | |
256 | have_ptrace_getregs = 0; | |
257 | return; | |
258 | } | |
259 | ||
e2e0b3e5 | 260 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
261 | } |
262 | ||
2e024c20 | 263 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
264 | } |
265 | ||
04cd15b6 MK |
266 | /* Store all valid general-purpose registers in GDB's register array |
267 | into the process/thread specified by TID. */ | |
5c44784c | 268 | |
5c44784c | 269 | static void |
56be3814 | 270 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 271 | { |
04cd15b6 | 272 | elf_gregset_t regs; |
5c44784c | 273 | |
6ce2ac0b | 274 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 275 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 276 | |
56be3814 | 277 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
278 | |
279 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 280 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
281 | } |
282 | ||
f60300e7 MK |
283 | #else |
284 | ||
56be3814 UW |
285 | static void fetch_regs (struct regcache *regcache, int tid) {} |
286 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
287 | |
288 | #endif | |
5c44784c | 289 | \f |
5c44784c | 290 | |
6ce2ac0b | 291 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 292 | |
04cd15b6 | 293 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 294 | *FPREGSETP. */ |
04cd15b6 | 295 | |
d4f3574e | 296 | void |
7f7fe91e | 297 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 298 | { |
7f7fe91e | 299 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 300 | } |
d4f3574e | 301 | |
04cd15b6 MK |
302 | /* Fill register REGNO (if it is a floating-point register) in |
303 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
304 | do this for all registers. */ | |
917317f4 JM |
305 | |
306 | void | |
7f7fe91e UW |
307 | fill_fpregset (const struct regcache *regcache, |
308 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 309 | { |
7f7fe91e | 310 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
311 | } |
312 | ||
f60300e7 MK |
313 | #ifdef HAVE_PTRACE_GETREGS |
314 | ||
04cd15b6 MK |
315 | /* Fetch all floating-point registers from process/thread TID and store |
316 | thier values in GDB's register array. */ | |
917317f4 | 317 | |
d4f3574e | 318 | static void |
56be3814 | 319 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 320 | { |
04cd15b6 | 321 | elf_fpregset_t fpregs; |
d4f3574e | 322 | |
6ce2ac0b | 323 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 324 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 325 | |
56be3814 | 326 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
327 | } |
328 | ||
04cd15b6 MK |
329 | /* Store all valid floating-point registers in GDB's register array |
330 | into the process/thread specified by TID. */ | |
d4f3574e | 331 | |
d4f3574e | 332 | static void |
56be3814 | 333 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 334 | { |
04cd15b6 | 335 | elf_fpregset_t fpregs; |
d4f3574e | 336 | |
6ce2ac0b | 337 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 338 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 339 | |
56be3814 | 340 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 341 | |
6ce2ac0b | 342 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 343 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
344 | } |
345 | ||
f60300e7 MK |
346 | #else |
347 | ||
1777feb0 MS |
348 | static void |
349 | fetch_fpregs (struct regcache *regcache, int tid) | |
350 | { | |
351 | } | |
352 | ||
353 | static void | |
354 | store_fpregs (const struct regcache *regcache, int tid, int regno) | |
355 | { | |
356 | } | |
f60300e7 MK |
357 | |
358 | #endif | |
5c44784c | 359 | \f |
d4f3574e | 360 | |
6ce2ac0b | 361 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 362 | |
c131fcee L |
363 | /* Fetch all registers covered by the PTRACE_GETREGSET request from |
364 | process/thread TID and store their values in GDB's register array. | |
365 | Return non-zero if successful, zero otherwise. */ | |
366 | ||
367 | static int | |
368 | fetch_xstateregs (struct regcache *regcache, int tid) | |
369 | { | |
370 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
371 | struct iovec iov; | |
372 | ||
373 | if (!have_ptrace_getregset) | |
374 | return 0; | |
375 | ||
376 | iov.iov_base = xstateregs; | |
377 | iov.iov_len = sizeof(xstateregs); | |
378 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
379 | &iov) < 0) | |
380 | perror_with_name (_("Couldn't read extended state status")); | |
381 | ||
382 | i387_supply_xsave (regcache, -1, xstateregs); | |
383 | return 1; | |
384 | } | |
385 | ||
386 | /* Store all valid registers in GDB's register array covered by the | |
387 | PTRACE_SETREGSET request into the process/thread specified by TID. | |
388 | Return non-zero if successful, zero otherwise. */ | |
389 | ||
390 | static int | |
391 | store_xstateregs (const struct regcache *regcache, int tid, int regno) | |
392 | { | |
393 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
394 | struct iovec iov; | |
395 | ||
396 | if (!have_ptrace_getregset) | |
397 | return 0; | |
398 | ||
399 | iov.iov_base = xstateregs; | |
400 | iov.iov_len = sizeof(xstateregs); | |
401 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
402 | &iov) < 0) | |
403 | perror_with_name (_("Couldn't read extended state status")); | |
404 | ||
405 | i387_collect_xsave (regcache, regno, xstateregs, 0); | |
406 | ||
407 | if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
408 | (int) &iov) < 0) | |
409 | perror_with_name (_("Couldn't write extended state status")); | |
410 | ||
411 | return 1; | |
412 | } | |
413 | ||
6ce2ac0b | 414 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 | 415 | |
6ce2ac0b | 416 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
417 | process/thread TID and store their values in GDB's register array. |
418 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 419 | |
5c44784c | 420 | static int |
56be3814 | 421 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 422 | { |
6ce2ac0b | 423 | elf_fpxregset_t fpxregs; |
5c44784c | 424 | |
6ce2ac0b | 425 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
426 | return 0; |
427 | ||
6ce2ac0b | 428 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 429 | { |
5c44784c JM |
430 | if (errno == EIO) |
431 | { | |
6ce2ac0b | 432 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
433 | return 0; |
434 | } | |
435 | ||
e2e0b3e5 | 436 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
437 | } |
438 | ||
b7a8b4ef | 439 | i387_supply_fxsave (regcache, -1, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
440 | return 1; |
441 | } | |
d4f3574e | 442 | |
04cd15b6 | 443 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 444 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 445 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 446 | |
5c44784c | 447 | static int |
56be3814 | 448 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 449 | { |
6ce2ac0b | 450 | elf_fpxregset_t fpxregs; |
5c44784c | 451 | |
6ce2ac0b | 452 | if (! have_ptrace_getfpxregs) |
5c44784c | 453 | return 0; |
6ce2ac0b MK |
454 | |
455 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
456 | { |
457 | if (errno == EIO) | |
458 | { | |
459 | have_ptrace_getfpxregs = 0; | |
460 | return 0; | |
461 | } | |
462 | ||
e2e0b3e5 | 463 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 464 | } |
5c44784c | 465 | |
b7a8b4ef | 466 | i387_collect_fxsave (regcache, regno, &fpxregs); |
5c44784c | 467 | |
6ce2ac0b | 468 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 469 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
470 | |
471 | return 1; | |
472 | } | |
473 | ||
5c44784c JM |
474 | #else |
475 | ||
1777feb0 MS |
476 | static int |
477 | fetch_fpxregs (struct regcache *regcache, int tid) | |
478 | { | |
479 | return 0; | |
480 | } | |
481 | ||
482 | static int | |
483 | store_fpxregs (const struct regcache *regcache, int tid, int regno) | |
484 | { | |
485 | return 0; | |
486 | } | |
5c44784c | 487 | |
6ce2ac0b | 488 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 489 | \f |
6ce2ac0b | 490 | |
5c44784c | 491 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 492 | |
04cd15b6 MK |
493 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
494 | this for all registers (including the floating point and SSE | |
495 | registers). */ | |
d4f3574e | 496 | |
10d6c8cd | 497 | static void |
28439f5e PA |
498 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
499 | struct regcache *regcache, int regno) | |
d4f3574e | 500 | { |
ed9a39eb JM |
501 | int tid; |
502 | ||
f60300e7 MK |
503 | /* Use the old method of peeking around in `struct user' if the |
504 | GETREGS request isn't available. */ | |
ce556f85 | 505 | if (!have_ptrace_getregs) |
f60300e7 | 506 | { |
ce556f85 MK |
507 | int i; |
508 | ||
875f8d0e | 509 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 510 | if (regno == -1 || regno == i) |
56be3814 | 511 | fetch_register (regcache, i); |
ce556f85 | 512 | |
f60300e7 MK |
513 | return; |
514 | } | |
515 | ||
a4b6fc86 | 516 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 517 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 518 | if (tid == 0) |
dfd4cc63 | 519 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
ed9a39eb | 520 | |
6ce2ac0b | 521 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 522 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 523 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 524 | zero. */ |
5c44784c JM |
525 | if (regno == -1) |
526 | { | |
56be3814 | 527 | fetch_regs (regcache, tid); |
f60300e7 MK |
528 | |
529 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 530 | if (!have_ptrace_getregs) |
f60300e7 | 531 | { |
84e473c8 | 532 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
533 | return; |
534 | } | |
535 | ||
c131fcee L |
536 | if (fetch_xstateregs (regcache, tid)) |
537 | return; | |
56be3814 | 538 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 539 | return; |
56be3814 | 540 | fetch_fpregs (regcache, tid); |
5c44784c JM |
541 | return; |
542 | } | |
d4f3574e | 543 | |
5c44784c JM |
544 | if (GETREGS_SUPPLIES (regno)) |
545 | { | |
56be3814 | 546 | fetch_regs (regcache, tid); |
5c44784c JM |
547 | return; |
548 | } | |
549 | ||
c131fcee L |
550 | if (GETXSTATEREGS_SUPPLIES (regno)) |
551 | { | |
552 | if (fetch_xstateregs (regcache, tid)) | |
553 | return; | |
554 | } | |
555 | ||
6ce2ac0b | 556 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 557 | { |
56be3814 | 558 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
559 | return; |
560 | ||
561 | /* Either our processor or our kernel doesn't support the SSE | |
562 | registers, so read the FP registers in the traditional way, | |
563 | and fill the SSE registers with dummy values. It would be | |
564 | more graceful to handle differences in the register set using | |
565 | gdbarch. Until then, this will at least make things work | |
566 | plausibly. */ | |
56be3814 | 567 | fetch_fpregs (regcache, tid); |
5c44784c JM |
568 | return; |
569 | } | |
570 | ||
8e65ff28 | 571 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 572 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
573 | } |
574 | ||
04cd15b6 MK |
575 | /* Store register REGNO back into the child process. If REGNO is -1, |
576 | do this for all registers (including the floating point and SSE | |
577 | registers). */ | |
10d6c8cd | 578 | static void |
28439f5e PA |
579 | i386_linux_store_inferior_registers (struct target_ops *ops, |
580 | struct regcache *regcache, int regno) | |
d4f3574e | 581 | { |
ed9a39eb JM |
582 | int tid; |
583 | ||
f60300e7 MK |
584 | /* Use the old method of poking around in `struct user' if the |
585 | SETREGS request isn't available. */ | |
ce556f85 | 586 | if (!have_ptrace_getregs) |
f60300e7 | 587 | { |
ce556f85 MK |
588 | int i; |
589 | ||
875f8d0e | 590 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 591 | if (regno == -1 || regno == i) |
56be3814 | 592 | store_register (regcache, i); |
ce556f85 | 593 | |
f60300e7 MK |
594 | return; |
595 | } | |
596 | ||
a4b6fc86 | 597 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 598 | tid = ptid_get_lwp (inferior_ptid); |
e64a344c | 599 | if (tid == 0) |
dfd4cc63 | 600 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
ed9a39eb | 601 | |
6ce2ac0b | 602 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 603 | transfers more registers in one system call. But remember that |
6ce2ac0b | 604 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
605 | if (regno == -1) |
606 | { | |
56be3814 | 607 | store_regs (regcache, tid, regno); |
c131fcee L |
608 | if (store_xstateregs (regcache, tid, regno)) |
609 | return; | |
56be3814 | 610 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c | 611 | return; |
56be3814 | 612 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
613 | return; |
614 | } | |
d4f3574e | 615 | |
5c44784c JM |
616 | if (GETREGS_SUPPLIES (regno)) |
617 | { | |
56be3814 | 618 | store_regs (regcache, tid, regno); |
5c44784c JM |
619 | return; |
620 | } | |
621 | ||
c131fcee L |
622 | if (GETXSTATEREGS_SUPPLIES (regno)) |
623 | { | |
624 | if (store_xstateregs (regcache, tid, regno)) | |
625 | return; | |
626 | } | |
627 | ||
6ce2ac0b | 628 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 629 | { |
56be3814 | 630 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
631 | return; |
632 | ||
633 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
634 | registers, so just write the FP registers in the traditional |
635 | way. */ | |
56be3814 | 636 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
637 | return; |
638 | } | |
639 | ||
8e65ff28 | 640 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 641 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 642 | } |
de57eccd | 643 | \f |
6ce2ac0b | 644 | |
4ffc8466 MK |
645 | /* Support for debug registers. */ |
646 | ||
a79d3c27 JK |
647 | /* Get debug register REGNUM value from only the one LWP of PTID. */ |
648 | ||
7bf0983e | 649 | static unsigned long |
9f0bdab8 | 650 | i386_linux_dr_get (ptid_t ptid, int regnum) |
84346e11 MK |
651 | { |
652 | int tid; | |
7bf0983e | 653 | unsigned long value; |
84346e11 | 654 | |
dfd4cc63 | 655 | tid = ptid_get_lwp (ptid); |
9f0bdab8 | 656 | if (tid == 0) |
dfd4cc63 | 657 | tid = ptid_get_pid (ptid); |
84346e11 MK |
658 | |
659 | errno = 0; | |
ce556f85 | 660 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
661 | offsetof (struct user, u_debugreg[regnum]), 0); |
662 | if (errno != 0) | |
e2e0b3e5 | 663 | perror_with_name (_("Couldn't read debug register")); |
84346e11 MK |
664 | |
665 | return value; | |
666 | } | |
667 | ||
a79d3c27 JK |
668 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ |
669 | ||
84346e11 | 670 | static void |
9f0bdab8 | 671 | i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
84346e11 MK |
672 | { |
673 | int tid; | |
674 | ||
dfd4cc63 | 675 | tid = ptid_get_lwp (ptid); |
9f0bdab8 | 676 | if (tid == 0) |
dfd4cc63 | 677 | tid = ptid_get_pid (ptid); |
84346e11 MK |
678 | |
679 | errno = 0; | |
ce556f85 | 680 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
681 | offsetof (struct user, u_debugreg[regnum]), value); |
682 | if (errno != 0) | |
e2e0b3e5 | 683 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
684 | } |
685 | ||
7b50312a | 686 | /* Return the inferior's debug register REGNUM. */ |
a79d3c27 | 687 | |
7b50312a PA |
688 | static CORE_ADDR |
689 | i386_linux_dr_get_addr (int regnum) | |
84346e11 | 690 | { |
7b50312a PA |
691 | /* DR6 and DR7 are retrieved with some other way. */ |
692 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); | |
9f0bdab8 | 693 | |
7b50312a | 694 | return i386_linux_dr_get (inferior_ptid, regnum); |
84346e11 MK |
695 | } |
696 | ||
7b50312a | 697 | /* Return the inferior's DR7 debug control register. */ |
a79d3c27 | 698 | |
7b50312a PA |
699 | static unsigned long |
700 | i386_linux_dr_get_control (void) | |
84346e11 | 701 | { |
7b50312a PA |
702 | return i386_linux_dr_get (inferior_ptid, DR_CONTROL); |
703 | } | |
9f0bdab8 | 704 | |
7b50312a | 705 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ |
84346e11 | 706 | |
7b50312a PA |
707 | static unsigned long |
708 | i386_linux_dr_get_status (void) | |
709 | { | |
710 | return i386_linux_dr_get (inferior_ptid, DR_STATUS); | |
84346e11 MK |
711 | } |
712 | ||
26cb8b7c PA |
713 | /* Callback for iterate_over_lwps. Update the debug registers of |
714 | LWP. */ | |
7b50312a PA |
715 | |
716 | static int | |
717 | update_debug_registers_callback (struct lwp_info *lwp, void *arg) | |
718 | { | |
6e012a6c PA |
719 | if (lwp->arch_private == NULL) |
720 | lwp->arch_private = XCNEW (struct arch_lwp_info); | |
721 | ||
7b50312a PA |
722 | /* The actual update is done later just before resuming the lwp, we |
723 | just mark that the registers need updating. */ | |
724 | lwp->arch_private->debug_registers_changed = 1; | |
725 | ||
726 | /* If the lwp isn't stopped, force it to momentarily pause, so we | |
727 | can update its debug registers. */ | |
728 | if (!lwp->stopped) | |
729 | linux_stop_lwp (lwp); | |
730 | ||
8da828f7 | 731 | /* Continue the iteration. */ |
7b50312a PA |
732 | return 0; |
733 | } | |
734 | ||
735 | /* Set DR_CONTROL to ADDR in all LWPs of the current inferior. */ | |
a79d3c27 | 736 | |
9bb9e8ad | 737 | static void |
7b50312a | 738 | i386_linux_dr_set_control (unsigned long control) |
84346e11 | 739 | { |
26cb8b7c PA |
740 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
741 | ||
742 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
84346e11 MK |
743 | } |
744 | ||
7b50312a PA |
745 | /* Set address REGNUM (zero based) to ADDR in all LWPs of the current |
746 | inferior. */ | |
a79d3c27 | 747 | |
7b50312a PA |
748 | static void |
749 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
84346e11 | 750 | { |
7b50312a PA |
751 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
752 | ||
753 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
754 | ||
26cb8b7c | 755 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); |
9f0bdab8 DJ |
756 | } |
757 | ||
7b50312a PA |
758 | /* Called when resuming a thread. |
759 | If the debug regs have changed, update the thread's copies. */ | |
a79d3c27 JK |
760 | |
761 | static void | |
7b50312a | 762 | i386_linux_prepare_to_resume (struct lwp_info *lwp) |
a79d3c27 | 763 | { |
7b50312a | 764 | int clear_status = 0; |
a79d3c27 | 765 | |
6e012a6c PA |
766 | /* NULL means this is the main thread still going through the shell, |
767 | or, no watchpoint has been set yet. In that case, there's | |
768 | nothing to do. */ | |
769 | if (lwp->arch_private == NULL) | |
770 | return; | |
771 | ||
7b50312a | 772 | if (lwp->arch_private->debug_registers_changed) |
a79d3c27 | 773 | { |
26cb8b7c PA |
774 | struct i386_debug_reg_state *state |
775 | = i386_debug_reg_state (ptid_get_pid (lwp->ptid)); | |
7b50312a PA |
776 | int i; |
777 | ||
4403d8e9 JK |
778 | /* See amd64_linux_prepare_to_resume for Linux kernel note on |
779 | i386_linux_dr_set calls ordering. */ | |
780 | ||
7b50312a PA |
781 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) |
782 | if (state->dr_ref_count[i] > 0) | |
783 | { | |
784 | i386_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); | |
785 | ||
786 | /* If we're setting a watchpoint, any change the inferior | |
787 | had done itself to the debug registers needs to be | |
788 | discarded, otherwise, i386_stopped_data_address can get | |
789 | confused. */ | |
790 | clear_status = 1; | |
791 | } | |
4c38200f | 792 | |
7b50312a PA |
793 | i386_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); |
794 | ||
795 | lwp->arch_private->debug_registers_changed = 0; | |
a79d3c27 | 796 | } |
7b50312a PA |
797 | |
798 | if (clear_status || lwp->stopped_by_watchpoint) | |
799 | i386_linux_dr_set (lwp->ptid, DR_STATUS, 0); | |
a79d3c27 JK |
800 | } |
801 | ||
9f0bdab8 | 802 | static void |
7b50312a | 803 | i386_linux_new_thread (struct lwp_info *lp) |
9f0bdab8 | 804 | { |
7b50312a | 805 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); |
9f0bdab8 | 806 | |
7b50312a | 807 | info->debug_registers_changed = 1; |
9f0bdab8 | 808 | |
7b50312a | 809 | lp->arch_private = info; |
84346e11 | 810 | } |
26cb8b7c PA |
811 | |
812 | /* linux_nat_new_fork hook. */ | |
813 | ||
814 | static void | |
815 | i386_linux_new_fork (struct lwp_info *parent, pid_t child_pid) | |
816 | { | |
817 | pid_t parent_pid; | |
818 | struct i386_debug_reg_state *parent_state; | |
819 | struct i386_debug_reg_state *child_state; | |
820 | ||
821 | /* NULL means no watchpoint has ever been set in the parent. In | |
822 | that case, there's nothing to do. */ | |
823 | if (parent->arch_private == NULL) | |
824 | return; | |
825 | ||
826 | /* Linux kernel before 2.6.33 commit | |
827 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
828 | will inherit hardware debug registers from parent | |
829 | on fork/vfork/clone. Newer Linux kernels create such tasks with | |
830 | zeroed debug registers. | |
831 | ||
832 | GDB core assumes the child inherits the watchpoints/hw | |
833 | breakpoints of the parent, and will remove them all from the | |
834 | forked off process. Copy the debug registers mirrors into the | |
835 | new process so that all breakpoints and watchpoints can be | |
836 | removed together. The debug registers mirror will become zeroed | |
837 | in the end before detaching the forked off process, thus making | |
838 | this compatible with older Linux kernels too. */ | |
839 | ||
840 | parent_pid = ptid_get_pid (parent->ptid); | |
841 | parent_state = i386_debug_reg_state (parent_pid); | |
842 | child_state = i386_debug_reg_state (child_pid); | |
843 | *child_state = *parent_state; | |
844 | } | |
845 | ||
84346e11 MK |
846 | \f |
847 | ||
5bca7895 MK |
848 | /* Called by libthread_db. Returns a pointer to the thread local |
849 | storage (or its descriptor). */ | |
850 | ||
851 | ps_err_e | |
852 | ps_get_thread_area (const struct ps_prochandle *ph, | |
853 | lwpid_t lwpid, int idx, void **base) | |
854 | { | |
855 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
856 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
857 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
858 | and a bunch of status bits. | |
859 | ||
860 | The values returned by this ptrace call should be part of the | |
861 | regcache buffer, and ps_get_thread_area should channel its | |
862 | request through the regcache. That way remote targets could | |
863 | provide the value using the remote protocol and not this direct | |
864 | call. | |
865 | ||
866 | Is this function needed? I'm guessing that the `base' is the | |
766062f6 | 867 | address of a descriptor that libthread_db uses to find the |
b2fa5097 | 868 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
869 | descriptor is defined by the ABI. Anyway, given that |
870 | libthread_db calls this function without prompting (gdb | |
871 | requesting tls base) I guess it needs info in there anyway. */ | |
872 | unsigned int desc[4]; | |
873 | gdb_assert (sizeof (int) == 4); | |
874 | ||
875 | #ifndef PTRACE_GET_THREAD_AREA | |
876 | #define PTRACE_GET_THREAD_AREA 25 | |
877 | #endif | |
878 | ||
879 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
880 | (void *) idx, (unsigned long) &desc) < 0) | |
881 | return PS_ERR; | |
882 | ||
883 | *(int *)base = desc[1]; | |
884 | return PS_OK; | |
885 | } | |
886 | \f | |
887 | ||
a4b6fc86 | 888 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
889 | int $0x80 |
890 | or 0xcd 0x80. */ | |
891 | ||
892 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
893 | ||
894 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
895 | ||
896 | /* The system call number is stored in the %eax register. */ | |
7532965f | 897 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
898 | |
899 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
900 | system calls. */ | |
901 | ||
902 | #ifndef SYS_sigreturn | |
903 | #define SYS_sigreturn 0x77 | |
904 | #endif | |
905 | #ifndef SYS_rt_sigreturn | |
906 | #define SYS_rt_sigreturn 0xad | |
907 | #endif | |
908 | ||
909 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
910 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
911 | ||
912 | /* Resume execution of the inferior process. | |
913 | If STEP is nonzero, single-step it. | |
914 | If SIGNAL is nonzero, give it that signal. */ | |
915 | ||
10d6c8cd | 916 | static void |
28439f5e | 917 | i386_linux_resume (struct target_ops *ops, |
2ea28649 | 918 | ptid_t ptid, int step, enum gdb_signal signal) |
a6abb2c0 | 919 | { |
dfd4cc63 | 920 | int pid = ptid_get_pid (ptid); |
39f77062 | 921 | |
a96d9b2e SDJ |
922 | int request; |
923 | ||
924 | if (catch_syscall_enabled () > 0) | |
925 | request = PTRACE_SYSCALL; | |
926 | else | |
927 | request = PTRACE_CONT; | |
a6abb2c0 | 928 | |
a6abb2c0 MK |
929 | if (step) |
930 | { | |
594f7785 | 931 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
e17a4113 UW |
932 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
933 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7b86a1b8 | 934 | ULONGEST pc; |
8e70166d | 935 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
936 | |
937 | request = PTRACE_SINGLESTEP; | |
938 | ||
e17a4113 UW |
939 | regcache_cooked_read_unsigned (regcache, |
940 | gdbarch_pc_regnum (gdbarch), &pc); | |
7b86a1b8 | 941 | |
a6abb2c0 MK |
942 | /* Returning from a signal trampoline is done by calling a |
943 | special system call (sigreturn or rt_sigreturn, see | |
944 | i386-linux-tdep.c for more information). This system call | |
945 | restores the registers that were saved when the signal was | |
946 | raised, including %eflags. That means that single-stepping | |
947 | won't work. Instead, we'll have to modify the signal context | |
948 | that's about to be restored, and set the trace flag there. */ | |
949 | ||
950 | /* First check if PC is at a system call. */ | |
8defab1a | 951 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
952 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
953 | { | |
7b86a1b8 UW |
954 | ULONGEST syscall; |
955 | regcache_cooked_read_unsigned (regcache, | |
956 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
957 | |
958 | /* Then check the system call number. */ | |
959 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
960 | { | |
7b86a1b8 | 961 | ULONGEST sp, addr; |
a6abb2c0 | 962 | unsigned long int eflags; |
7bf0983e | 963 | |
7b86a1b8 | 964 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 | 965 | if (syscall == SYS_rt_sigreturn) |
f3d6df6d YQ |
966 | addr = read_memory_unsigned_integer (sp + 8, 4, byte_order) |
967 | + 20; | |
7b86a1b8 UW |
968 | else |
969 | addr = sp; | |
a6abb2c0 MK |
970 | |
971 | /* Set the trace flag in the context that's about to be | |
972 | restored. */ | |
973 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 974 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 975 | eflags |= 0x0100; |
8e70166d | 976 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
977 | } |
978 | } | |
979 | } | |
980 | ||
2ea28649 | 981 | if (ptrace (request, pid, 0, gdb_signal_to_host (signal)) == -1) |
e2e0b3e5 | 982 | perror_with_name (("ptrace")); |
a6abb2c0 | 983 | } |
4de4c07c | 984 | |
10d6c8cd DJ |
985 | static void (*super_post_startup_inferior) (ptid_t ptid); |
986 | ||
987 | static void | |
988 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
989 | { |
990 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
991 | super_post_startup_inferior (ptid); |
992 | } | |
993 | ||
90884b2b L |
994 | /* Get Linux/x86 target description from running target. */ |
995 | ||
996 | static const struct target_desc * | |
997 | i386_linux_read_description (struct target_ops *ops) | |
998 | { | |
3a13a53b | 999 | int tid; |
c131fcee L |
1000 | static uint64_t xcr0; |
1001 | ||
3a13a53b | 1002 | /* GNU/Linux LWP ID's are process ID's. */ |
dfd4cc63 | 1003 | tid = ptid_get_lwp (inferior_ptid); |
3a13a53b | 1004 | if (tid == 0) |
dfd4cc63 | 1005 | tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ |
3a13a53b L |
1006 | |
1007 | #ifdef HAVE_PTRACE_GETFPXREGS | |
1008 | if (have_ptrace_getfpxregs == -1) | |
1009 | { | |
1010 | elf_fpxregset_t fpxregs; | |
1011 | ||
1012 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) | |
1013 | { | |
1014 | have_ptrace_getfpxregs = 0; | |
1015 | have_ptrace_getregset = 0; | |
1016 | return tdesc_i386_mmx_linux; | |
1017 | } | |
1018 | } | |
1019 | #endif | |
1020 | ||
c131fcee L |
1021 | if (have_ptrace_getregset == -1) |
1022 | { | |
c131fcee L |
1023 | uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
1024 | struct iovec iov; | |
1025 | ||
c131fcee L |
1026 | iov.iov_base = xstateregs; |
1027 | iov.iov_len = sizeof (xstateregs); | |
1028 | ||
1029 | /* Check if PTRACE_GETREGSET works. */ | |
1030 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
1031 | &iov) < 0) | |
1032 | have_ptrace_getregset = 0; | |
1033 | else | |
1034 | { | |
1035 | have_ptrace_getregset = 1; | |
1036 | ||
1037 | /* Get XCR0 from XSAVE extended state. */ | |
1038 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET | |
1039 | / sizeof (long long))]; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ | |
1044 | if (have_ptrace_getregset | |
1045 | && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) | |
1046 | return tdesc_i386_avx_linux; | |
1047 | else | |
1048 | return tdesc_i386_linux; | |
90884b2b L |
1049 | } |
1050 | ||
3e3aea48 MM |
1051 | /* Enable branch tracing. */ |
1052 | ||
1053 | static struct btrace_target_info * | |
1054 | i386_linux_enable_btrace (ptid_t ptid) | |
1055 | { | |
1056 | struct btrace_target_info *tinfo; | |
1057 | struct gdbarch *gdbarch; | |
1058 | ||
1059 | errno = 0; | |
1060 | tinfo = linux_enable_btrace (ptid); | |
1061 | ||
1062 | if (tinfo == NULL) | |
1063 | error (_("Could not enable branch tracing for %s: %s."), | |
1064 | target_pid_to_str (ptid), safe_strerror (errno)); | |
1065 | ||
1066 | /* Fill in the size of a pointer in bits. */ | |
1067 | gdbarch = target_thread_architecture (ptid); | |
1068 | tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); | |
1069 | ||
1070 | return tinfo; | |
1071 | } | |
1072 | ||
1073 | /* Disable branch tracing. */ | |
1074 | ||
1075 | static void | |
1076 | i386_linux_disable_btrace (struct btrace_target_info *tinfo) | |
1077 | { | |
1078 | int errcode = linux_disable_btrace (tinfo); | |
1079 | ||
1080 | if (errcode != 0) | |
1081 | error (_("Could not disable branch tracing: %s."), safe_strerror (errcode)); | |
1082 | } | |
1083 | ||
1084 | /* Teardown branch tracing. */ | |
1085 | ||
1086 | static void | |
1087 | i386_linux_teardown_btrace (struct btrace_target_info *tinfo) | |
1088 | { | |
1089 | /* Ignore errors. */ | |
1090 | linux_disable_btrace (tinfo); | |
1091 | } | |
1092 | ||
a95babbf YQ |
1093 | /* -Wmissing-prototypes */ |
1094 | extern initialize_file_ftype _initialize_i386_linux_nat; | |
1095 | ||
10d6c8cd DJ |
1096 | void |
1097 | _initialize_i386_linux_nat (void) | |
1098 | { | |
1099 | struct target_ops *t; | |
1100 | ||
1101 | /* Fill in the generic GNU/Linux methods. */ | |
1102 | t = linux_target (); | |
1103 | ||
c03374d5 DJ |
1104 | i386_use_watchpoints (t); |
1105 | ||
9bb9e8ad PM |
1106 | i386_dr_low.set_control = i386_linux_dr_set_control; |
1107 | i386_dr_low.set_addr = i386_linux_dr_set_addr; | |
7b50312a | 1108 | i386_dr_low.get_addr = i386_linux_dr_get_addr; |
9bb9e8ad | 1109 | i386_dr_low.get_status = i386_linux_dr_get_status; |
7b50312a | 1110 | i386_dr_low.get_control = i386_linux_dr_get_control; |
9bb9e8ad PM |
1111 | i386_set_debug_register_length (4); |
1112 | ||
10d6c8cd DJ |
1113 | /* Override the default ptrace resume method. */ |
1114 | t->to_resume = i386_linux_resume; | |
1115 | ||
1116 | /* Override the GNU/Linux inferior startup hook. */ | |
1117 | super_post_startup_inferior = t->to_post_startup_inferior; | |
1118 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
1119 | ||
1120 | /* Add our register access methods. */ | |
1121 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
1122 | t->to_store_registers = i386_linux_store_inferior_registers; | |
1123 | ||
90884b2b L |
1124 | t->to_read_description = i386_linux_read_description; |
1125 | ||
3e3aea48 MM |
1126 | /* Add btrace methods. */ |
1127 | t->to_supports_btrace = linux_supports_btrace; | |
1128 | t->to_enable_btrace = i386_linux_enable_btrace; | |
1129 | t->to_disable_btrace = i386_linux_disable_btrace; | |
1130 | t->to_teardown_btrace = i386_linux_teardown_btrace; | |
1131 | t->to_read_btrace = linux_read_btrace; | |
1132 | ||
10d6c8cd | 1133 | /* Register the target. */ |
f973ed9c | 1134 | linux_nat_add_target (t); |
9f0bdab8 | 1135 | linux_nat_set_new_thread (t, i386_linux_new_thread); |
26cb8b7c PA |
1136 | linux_nat_set_new_fork (t, i386_linux_new_fork); |
1137 | linux_nat_set_forget_process (t, i386_forget_process); | |
7b50312a | 1138 | linux_nat_set_prepare_to_resume (t, i386_linux_prepare_to_resume); |
4de4c07c | 1139 | } |