Commit | Line | Data |
---|---|---|
a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
0fb0cc75 | 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
4c38e0a4 | 4 | 2009, 2010 Free Software Foundation, Inc. |
d4f3574e | 5 | |
04cd15b6 | 6 | This file is part of GDB. |
d4f3574e | 7 | |
04cd15b6 MK |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
04cd15b6 | 11 | (at your option) any later version. |
d4f3574e | 12 | |
04cd15b6 MK |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
d4f3574e | 17 | |
04cd15b6 | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d4f3574e SS |
20 | |
21 | #include "defs.h" | |
9bb9e8ad | 22 | #include "i386-nat.h" |
d4f3574e SS |
23 | #include "inferior.h" |
24 | #include "gdbcore.h" | |
4e052eda | 25 | #include "regcache.h" |
c131fcee | 26 | #include "regset.h" |
10d6c8cd | 27 | #include "target.h" |
4de4c07c | 28 | #include "linux-nat.h" |
d4f3574e | 29 | |
84346e11 | 30 | #include "gdb_assert.h" |
309367d4 | 31 | #include "gdb_string.h" |
c131fcee L |
32 | #include "elf/common.h" |
33 | #include <sys/uio.h> | |
d4f3574e SS |
34 | #include <sys/ptrace.h> |
35 | #include <sys/user.h> | |
36 | #include <sys/procfs.h> | |
37 | ||
38 | #ifdef HAVE_SYS_REG_H | |
39 | #include <sys/reg.h> | |
40 | #endif | |
41 | ||
ce556f85 MK |
42 | #ifndef ORIG_EAX |
43 | #define ORIG_EAX -1 | |
44 | #endif | |
45 | ||
84346e11 MK |
46 | #ifdef HAVE_SYS_DEBUGREG_H |
47 | #include <sys/debugreg.h> | |
48 | #endif | |
49 | ||
50 | #ifndef DR_FIRSTADDR | |
51 | #define DR_FIRSTADDR 0 | |
52 | #endif | |
53 | ||
54 | #ifndef DR_LASTADDR | |
55 | #define DR_LASTADDR 3 | |
56 | #endif | |
57 | ||
58 | #ifndef DR_STATUS | |
59 | #define DR_STATUS 6 | |
60 | #endif | |
61 | ||
62 | #ifndef DR_CONTROL | |
63 | #define DR_CONTROL 7 | |
64 | #endif | |
65 | ||
6ce2ac0b | 66 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
67 | #include "gregset.h" |
68 | ||
e750d25e | 69 | #include "i387-tdep.h" |
c3833324 | 70 | #include "i386-tdep.h" |
5179e78f AC |
71 | #include "i386-linux-tdep.h" |
72 | ||
b757528f JJ |
73 | /* Defines ps_err_e, struct ps_prochandle. */ |
74 | #include "gdb_proc_service.h" | |
c131fcee L |
75 | |
76 | #include "i386-xstate.h" | |
77 | ||
78 | #ifndef PTRACE_GETREGSET | |
79 | #define PTRACE_GETREGSET 0x4204 | |
80 | #endif | |
81 | ||
82 | #ifndef PTRACE_SETREGSET | |
83 | #define PTRACE_SETREGSET 0x4205 | |
84 | #endif | |
85 | ||
86 | /* Does the current host support PTRACE_GETREGSET? */ | |
87 | static int have_ptrace_getregset = -1; | |
6ce2ac0b | 88 | \f |
d4f3574e | 89 | |
a4b6fc86 AC |
90 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
91 | the register sets in `struct user' that is used for a.out | |
92 | core-dumps, and is also used by `ptrace'. The corresponding types | |
93 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
94 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
95 | for the floating-point registers. | |
96 | ||
97 | Those types used to be available under the names `gregset_t' and | |
98 | `fpregset_t' too, and this file used those names in the past. But | |
99 | those names are now used for the register sets used in the | |
100 | `mcontext_t' type, and have a different size and layout. */ | |
101 | ||
102 | /* Mapping between the general-purpose registers in `struct user' | |
103 | format and GDB's register array layout. */ | |
d4f3574e SS |
104 | static int regmap[] = |
105 | { | |
106 | EAX, ECX, EDX, EBX, | |
107 | UESP, EBP, ESI, EDI, | |
108 | EIP, EFL, CS, SS, | |
ce556f85 MK |
109 | DS, ES, FS, GS, |
110 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
111 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
112 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
113 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
114 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
115 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
116 | -1, /* mxcsr */ | |
c131fcee L |
117 | -1, -1, -1, -1, /* ymm0h, ymm1h, ymm2h, ymm3h */ |
118 | -1, -1, -1, -1, /* ymm4h, ymm5h, ymm6h, ymm6h */ | |
ce556f85 | 119 | ORIG_EAX |
d4f3574e SS |
120 | }; |
121 | ||
5c44784c JM |
122 | /* Which ptrace request retrieves which registers? |
123 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 124 | |
5c44784c | 125 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 126 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 127 | |
6ce2ac0b | 128 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 129 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 130 | |
c131fcee L |
131 | #define GETXSTATEREGS_SUPPLIES(regno) \ |
132 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX_NUM_REGS) | |
133 | ||
f60300e7 MK |
134 | /* Does the current host support the GETREGS request? */ |
135 | int have_ptrace_getregs = | |
136 | #ifdef HAVE_PTRACE_GETREGS | |
137 | 1 | |
138 | #else | |
139 | 0 | |
140 | #endif | |
141 | ; | |
142 | ||
6ce2ac0b | 143 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
144 | file may or may not define it, and even if it is defined, the |
145 | kernel will return EIO if it's running on a pre-SSE processor. | |
146 | ||
147 | My instinct is to attach this to some architecture- or | |
148 | target-specific data structure, but really, a particular GDB | |
149 | process can only run on top of one kernel at a time. So it's okay | |
150 | for this to be a simple variable. */ | |
6ce2ac0b MK |
151 | int have_ptrace_getfpxregs = |
152 | #ifdef HAVE_PTRACE_GETFPXREGS | |
3a13a53b | 153 | -1 |
5c44784c JM |
154 | #else |
155 | 0 | |
156 | #endif | |
157 | ; | |
f60300e7 | 158 | \f |
6ce2ac0b | 159 | |
ce556f85 | 160 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
161 | |
162 | /* Fetch one register. */ | |
163 | ||
164 | static void | |
56be3814 | 165 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 166 | { |
f60300e7 | 167 | int tid; |
ce556f85 | 168 | int val; |
f60300e7 | 169 | |
ce556f85 | 170 | gdb_assert (!have_ptrace_getregs); |
de732108 | 171 | if (regmap[regno] == -1) |
f60300e7 | 172 | { |
56be3814 | 173 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
174 | return; |
175 | } | |
176 | ||
ce556f85 | 177 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
178 | tid = TIDGET (inferior_ptid); |
179 | if (tid == 0) | |
180 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 181 | |
ce556f85 | 182 | errno = 0; |
de732108 | 183 | val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0); |
ce556f85 | 184 | if (errno != 0) |
c9f4d572 | 185 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 186 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 187 | regno, safe_strerror (errno)); |
f60300e7 | 188 | |
56be3814 | 189 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
190 | } |
191 | ||
f60300e7 MK |
192 | /* Store one register. */ |
193 | ||
194 | static void | |
56be3814 | 195 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 196 | { |
f60300e7 | 197 | int tid; |
ce556f85 | 198 | int val; |
f60300e7 | 199 | |
ce556f85 | 200 | gdb_assert (!have_ptrace_getregs); |
de732108 | 201 | if (regmap[regno] == -1) |
ce556f85 | 202 | return; |
f60300e7 | 203 | |
ce556f85 | 204 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
205 | tid = TIDGET (inferior_ptid); |
206 | if (tid == 0) | |
207 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 208 | |
ce556f85 | 209 | errno = 0; |
56be3814 | 210 | regcache_raw_collect (regcache, regno, &val); |
de732108 | 211 | ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val); |
ce556f85 | 212 | if (errno != 0) |
c9f4d572 | 213 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 214 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 215 | regno, safe_strerror (errno)); |
f60300e7 | 216 | } |
5c44784c | 217 | \f |
6ce2ac0b | 218 | |
04cd15b6 MK |
219 | /* Transfering the general-purpose registers between GDB, inferiors |
220 | and core files. */ | |
221 | ||
ad2a4d09 | 222 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 223 | in *GREGSETP. */ |
5c44784c | 224 | |
d4f3574e | 225 | void |
7f7fe91e | 226 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 227 | { |
7f7fe91e | 228 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
6ce2ac0b | 229 | int i; |
d4f3574e | 230 | |
98df6387 | 231 | for (i = 0; i < I386_NUM_GREGS; i++) |
7f7fe91e | 232 | regcache_raw_supply (regcache, i, regp + regmap[i]); |
3fb1c838 | 233 | |
875f8d0e UW |
234 | if (I386_LINUX_ORIG_EAX_REGNUM |
235 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
7f7fe91e | 236 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 237 | regp + ORIG_EAX); |
917317f4 JM |
238 | } |
239 | ||
04cd15b6 MK |
240 | /* Fill register REGNO (if it is a general-purpose register) in |
241 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
242 | do this for all registers. */ | |
6ce2ac0b | 243 | |
917317f4 | 244 | void |
7f7fe91e UW |
245 | fill_gregset (const struct regcache *regcache, |
246 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 247 | { |
6ce2ac0b MK |
248 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
249 | int i; | |
04cd15b6 | 250 | |
98df6387 | 251 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 252 | if (regno == -1 || regno == i) |
7f7fe91e | 253 | regcache_raw_collect (regcache, i, regp + regmap[i]); |
3fb1c838 | 254 | |
82ea117a | 255 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
256 | && I386_LINUX_ORIG_EAX_REGNUM |
257 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
7f7fe91e | 258 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 259 | regp + ORIG_EAX); |
d4f3574e SS |
260 | } |
261 | ||
f60300e7 MK |
262 | #ifdef HAVE_PTRACE_GETREGS |
263 | ||
04cd15b6 MK |
264 | /* Fetch all general-purpose registers from process/thread TID and |
265 | store their values in GDB's register array. */ | |
d4f3574e | 266 | |
5c44784c | 267 | static void |
56be3814 | 268 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 269 | { |
04cd15b6 | 270 | elf_gregset_t regs; |
2e024c20 | 271 | elf_gregset_t *regs_p = ®s; |
5c44784c | 272 | |
6ce2ac0b | 273 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 274 | { |
f60300e7 MK |
275 | if (errno == EIO) |
276 | { | |
277 | /* The kernel we're running on doesn't support the GETREGS | |
278 | request. Reset `have_ptrace_getregs'. */ | |
279 | have_ptrace_getregs = 0; | |
280 | return; | |
281 | } | |
282 | ||
e2e0b3e5 | 283 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
284 | } |
285 | ||
2e024c20 | 286 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
287 | } |
288 | ||
04cd15b6 MK |
289 | /* Store all valid general-purpose registers in GDB's register array |
290 | into the process/thread specified by TID. */ | |
5c44784c | 291 | |
5c44784c | 292 | static void |
56be3814 | 293 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 294 | { |
04cd15b6 | 295 | elf_gregset_t regs; |
5c44784c | 296 | |
6ce2ac0b | 297 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 298 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 299 | |
56be3814 | 300 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
301 | |
302 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 303 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
304 | } |
305 | ||
f60300e7 MK |
306 | #else |
307 | ||
56be3814 UW |
308 | static void fetch_regs (struct regcache *regcache, int tid) {} |
309 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
310 | |
311 | #endif | |
5c44784c | 312 | \f |
5c44784c | 313 | |
6ce2ac0b | 314 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 315 | |
04cd15b6 | 316 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 317 | *FPREGSETP. */ |
04cd15b6 | 318 | |
d4f3574e | 319 | void |
7f7fe91e | 320 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 321 | { |
7f7fe91e | 322 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 323 | } |
d4f3574e | 324 | |
04cd15b6 MK |
325 | /* Fill register REGNO (if it is a floating-point register) in |
326 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
327 | do this for all registers. */ | |
917317f4 JM |
328 | |
329 | void | |
7f7fe91e UW |
330 | fill_fpregset (const struct regcache *regcache, |
331 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 332 | { |
7f7fe91e | 333 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
334 | } |
335 | ||
f60300e7 MK |
336 | #ifdef HAVE_PTRACE_GETREGS |
337 | ||
04cd15b6 MK |
338 | /* Fetch all floating-point registers from process/thread TID and store |
339 | thier values in GDB's register array. */ | |
917317f4 | 340 | |
d4f3574e | 341 | static void |
56be3814 | 342 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 343 | { |
04cd15b6 | 344 | elf_fpregset_t fpregs; |
d4f3574e | 345 | |
6ce2ac0b | 346 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 347 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 348 | |
56be3814 | 349 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
350 | } |
351 | ||
04cd15b6 MK |
352 | /* Store all valid floating-point registers in GDB's register array |
353 | into the process/thread specified by TID. */ | |
d4f3574e | 354 | |
d4f3574e | 355 | static void |
56be3814 | 356 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 357 | { |
04cd15b6 | 358 | elf_fpregset_t fpregs; |
d4f3574e | 359 | |
6ce2ac0b | 360 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 361 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 362 | |
56be3814 | 363 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 364 | |
6ce2ac0b | 365 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 366 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
367 | } |
368 | ||
f60300e7 MK |
369 | #else |
370 | ||
56be3814 UW |
371 | static void fetch_fpregs (struct regcache *regcache, int tid) {} |
372 | static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
373 | |
374 | #endif | |
5c44784c | 375 | \f |
d4f3574e | 376 | |
6ce2ac0b | 377 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 378 | |
c131fcee L |
379 | /* Fetch all registers covered by the PTRACE_GETREGSET request from |
380 | process/thread TID and store their values in GDB's register array. | |
381 | Return non-zero if successful, zero otherwise. */ | |
382 | ||
383 | static int | |
384 | fetch_xstateregs (struct regcache *regcache, int tid) | |
385 | { | |
386 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
387 | struct iovec iov; | |
388 | ||
389 | if (!have_ptrace_getregset) | |
390 | return 0; | |
391 | ||
392 | iov.iov_base = xstateregs; | |
393 | iov.iov_len = sizeof(xstateregs); | |
394 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
395 | &iov) < 0) | |
396 | perror_with_name (_("Couldn't read extended state status")); | |
397 | ||
398 | i387_supply_xsave (regcache, -1, xstateregs); | |
399 | return 1; | |
400 | } | |
401 | ||
402 | /* Store all valid registers in GDB's register array covered by the | |
403 | PTRACE_SETREGSET request into the process/thread specified by TID. | |
404 | Return non-zero if successful, zero otherwise. */ | |
405 | ||
406 | static int | |
407 | store_xstateregs (const struct regcache *regcache, int tid, int regno) | |
408 | { | |
409 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
410 | struct iovec iov; | |
411 | ||
412 | if (!have_ptrace_getregset) | |
413 | return 0; | |
414 | ||
415 | iov.iov_base = xstateregs; | |
416 | iov.iov_len = sizeof(xstateregs); | |
417 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
418 | &iov) < 0) | |
419 | perror_with_name (_("Couldn't read extended state status")); | |
420 | ||
421 | i387_collect_xsave (regcache, regno, xstateregs, 0); | |
422 | ||
423 | if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
424 | (int) &iov) < 0) | |
425 | perror_with_name (_("Couldn't write extended state status")); | |
426 | ||
427 | return 1; | |
428 | } | |
429 | ||
6ce2ac0b | 430 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
431 | |
432 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 433 | values in *FPXREGSETP. */ |
04cd15b6 | 434 | |
975aec09 | 435 | void |
7f7fe91e UW |
436 | supply_fpxregset (struct regcache *regcache, |
437 | const elf_fpxregset_t *fpxregsetp) | |
d4f3574e | 438 | { |
7f7fe91e | 439 | i387_supply_fxsave (regcache, -1, fpxregsetp); |
d4f3574e SS |
440 | } |
441 | ||
6ce2ac0b MK |
442 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
443 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
444 | -1, do this for all registers. */ | |
d4f3574e | 445 | |
975aec09 | 446 | void |
7f7fe91e UW |
447 | fill_fpxregset (const struct regcache *regcache, |
448 | elf_fpxregset_t *fpxregsetp, int regno) | |
d4f3574e | 449 | { |
7f7fe91e | 450 | i387_collect_fxsave (regcache, regno, fpxregsetp); |
5c44784c JM |
451 | } |
452 | ||
6ce2ac0b | 453 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
454 | process/thread TID and store their values in GDB's register array. |
455 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 456 | |
5c44784c | 457 | static int |
56be3814 | 458 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 459 | { |
6ce2ac0b | 460 | elf_fpxregset_t fpxregs; |
5c44784c | 461 | |
6ce2ac0b | 462 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
463 | return 0; |
464 | ||
6ce2ac0b | 465 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 466 | { |
5c44784c JM |
467 | if (errno == EIO) |
468 | { | |
6ce2ac0b | 469 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
470 | return 0; |
471 | } | |
472 | ||
e2e0b3e5 | 473 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
474 | } |
475 | ||
56be3814 | 476 | supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
477 | return 1; |
478 | } | |
d4f3574e | 479 | |
04cd15b6 | 480 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 481 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 482 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 483 | |
5c44784c | 484 | static int |
56be3814 | 485 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 486 | { |
6ce2ac0b | 487 | elf_fpxregset_t fpxregs; |
5c44784c | 488 | |
6ce2ac0b | 489 | if (! have_ptrace_getfpxregs) |
5c44784c | 490 | return 0; |
6ce2ac0b MK |
491 | |
492 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
493 | { |
494 | if (errno == EIO) | |
495 | { | |
496 | have_ptrace_getfpxregs = 0; | |
497 | return 0; | |
498 | } | |
499 | ||
e2e0b3e5 | 500 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 501 | } |
5c44784c | 502 | |
56be3814 | 503 | fill_fpxregset (regcache, &fpxregs, regno); |
5c44784c | 504 | |
6ce2ac0b | 505 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 506 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
507 | |
508 | return 1; | |
509 | } | |
510 | ||
5c44784c JM |
511 | #else |
512 | ||
56be3814 UW |
513 | static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } |
514 | static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } | |
5c44784c | 515 | |
6ce2ac0b | 516 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 517 | \f |
6ce2ac0b | 518 | |
5c44784c | 519 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 520 | |
04cd15b6 MK |
521 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
522 | this for all registers (including the floating point and SSE | |
523 | registers). */ | |
d4f3574e | 524 | |
10d6c8cd | 525 | static void |
28439f5e PA |
526 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
527 | struct regcache *regcache, int regno) | |
d4f3574e | 528 | { |
ed9a39eb JM |
529 | int tid; |
530 | ||
f60300e7 MK |
531 | /* Use the old method of peeking around in `struct user' if the |
532 | GETREGS request isn't available. */ | |
ce556f85 | 533 | if (!have_ptrace_getregs) |
f60300e7 | 534 | { |
ce556f85 MK |
535 | int i; |
536 | ||
875f8d0e | 537 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 538 | if (regno == -1 || regno == i) |
56be3814 | 539 | fetch_register (regcache, i); |
ce556f85 | 540 | |
f60300e7 MK |
541 | return; |
542 | } | |
543 | ||
a4b6fc86 | 544 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
545 | tid = TIDGET (inferior_ptid); |
546 | if (tid == 0) | |
547 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 548 | |
6ce2ac0b | 549 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 550 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 551 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 552 | zero. */ |
5c44784c JM |
553 | if (regno == -1) |
554 | { | |
56be3814 | 555 | fetch_regs (regcache, tid); |
f60300e7 MK |
556 | |
557 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 558 | if (!have_ptrace_getregs) |
f60300e7 | 559 | { |
84e473c8 | 560 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
561 | return; |
562 | } | |
563 | ||
c131fcee L |
564 | if (fetch_xstateregs (regcache, tid)) |
565 | return; | |
56be3814 | 566 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 567 | return; |
56be3814 | 568 | fetch_fpregs (regcache, tid); |
5c44784c JM |
569 | return; |
570 | } | |
d4f3574e | 571 | |
5c44784c JM |
572 | if (GETREGS_SUPPLIES (regno)) |
573 | { | |
56be3814 | 574 | fetch_regs (regcache, tid); |
5c44784c JM |
575 | return; |
576 | } | |
577 | ||
c131fcee L |
578 | if (GETXSTATEREGS_SUPPLIES (regno)) |
579 | { | |
580 | if (fetch_xstateregs (regcache, tid)) | |
581 | return; | |
582 | } | |
583 | ||
6ce2ac0b | 584 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 585 | { |
56be3814 | 586 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
587 | return; |
588 | ||
589 | /* Either our processor or our kernel doesn't support the SSE | |
590 | registers, so read the FP registers in the traditional way, | |
591 | and fill the SSE registers with dummy values. It would be | |
592 | more graceful to handle differences in the register set using | |
593 | gdbarch. Until then, this will at least make things work | |
594 | plausibly. */ | |
56be3814 | 595 | fetch_fpregs (regcache, tid); |
5c44784c JM |
596 | return; |
597 | } | |
598 | ||
8e65ff28 | 599 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 600 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
601 | } |
602 | ||
04cd15b6 MK |
603 | /* Store register REGNO back into the child process. If REGNO is -1, |
604 | do this for all registers (including the floating point and SSE | |
605 | registers). */ | |
10d6c8cd | 606 | static void |
28439f5e PA |
607 | i386_linux_store_inferior_registers (struct target_ops *ops, |
608 | struct regcache *regcache, int regno) | |
d4f3574e | 609 | { |
ed9a39eb JM |
610 | int tid; |
611 | ||
f60300e7 MK |
612 | /* Use the old method of poking around in `struct user' if the |
613 | SETREGS request isn't available. */ | |
ce556f85 | 614 | if (!have_ptrace_getregs) |
f60300e7 | 615 | { |
ce556f85 MK |
616 | int i; |
617 | ||
875f8d0e | 618 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 619 | if (regno == -1 || regno == i) |
56be3814 | 620 | store_register (regcache, i); |
ce556f85 | 621 | |
f60300e7 MK |
622 | return; |
623 | } | |
624 | ||
a4b6fc86 | 625 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
626 | tid = TIDGET (inferior_ptid); |
627 | if (tid == 0) | |
628 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 629 | |
6ce2ac0b | 630 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 631 | transfers more registers in one system call. But remember that |
6ce2ac0b | 632 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
633 | if (regno == -1) |
634 | { | |
56be3814 | 635 | store_regs (regcache, tid, regno); |
c131fcee L |
636 | if (store_xstateregs (regcache, tid, regno)) |
637 | return; | |
56be3814 | 638 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c | 639 | return; |
56be3814 | 640 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
641 | return; |
642 | } | |
d4f3574e | 643 | |
5c44784c JM |
644 | if (GETREGS_SUPPLIES (regno)) |
645 | { | |
56be3814 | 646 | store_regs (regcache, tid, regno); |
5c44784c JM |
647 | return; |
648 | } | |
649 | ||
c131fcee L |
650 | if (GETXSTATEREGS_SUPPLIES (regno)) |
651 | { | |
652 | if (store_xstateregs (regcache, tid, regno)) | |
653 | return; | |
654 | } | |
655 | ||
6ce2ac0b | 656 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 657 | { |
56be3814 | 658 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
659 | return; |
660 | ||
661 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
662 | registers, so just write the FP registers in the traditional |
663 | way. */ | |
56be3814 | 664 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
665 | return; |
666 | } | |
667 | ||
8e65ff28 | 668 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 669 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 670 | } |
de57eccd | 671 | \f |
6ce2ac0b | 672 | |
4ffc8466 MK |
673 | /* Support for debug registers. */ |
674 | ||
9f0bdab8 DJ |
675 | static unsigned long i386_linux_dr[DR_CONTROL + 1]; |
676 | ||
a79d3c27 JK |
677 | /* Get debug register REGNUM value from only the one LWP of PTID. */ |
678 | ||
7bf0983e | 679 | static unsigned long |
9f0bdab8 | 680 | i386_linux_dr_get (ptid_t ptid, int regnum) |
84346e11 MK |
681 | { |
682 | int tid; | |
7bf0983e | 683 | unsigned long value; |
84346e11 | 684 | |
9f0bdab8 DJ |
685 | tid = TIDGET (ptid); |
686 | if (tid == 0) | |
687 | tid = PIDGET (ptid); | |
84346e11 | 688 | |
b9511b9a MK |
689 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
690 | ptrace call fails breaks debugging remote targets. The correct | |
691 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 692 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 693 | ptrace call fails. */ |
84346e11 | 694 | errno = 0; |
ce556f85 | 695 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
696 | offsetof (struct user, u_debugreg[regnum]), 0); |
697 | if (errno != 0) | |
b9511b9a | 698 | #if 0 |
e2e0b3e5 | 699 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
700 | #else |
701 | return 0; | |
702 | #endif | |
84346e11 MK |
703 | |
704 | return value; | |
705 | } | |
706 | ||
a79d3c27 JK |
707 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ |
708 | ||
84346e11 | 709 | static void |
9f0bdab8 | 710 | i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
84346e11 MK |
711 | { |
712 | int tid; | |
713 | ||
9f0bdab8 DJ |
714 | tid = TIDGET (ptid); |
715 | if (tid == 0) | |
716 | tid = PIDGET (ptid); | |
84346e11 MK |
717 | |
718 | errno = 0; | |
ce556f85 | 719 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
720 | offsetof (struct user, u_debugreg[regnum]), value); |
721 | if (errno != 0) | |
e2e0b3e5 | 722 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
723 | } |
724 | ||
a79d3c27 JK |
725 | /* Set DR_CONTROL to ADDR in all LWPs of LWP_LIST. */ |
726 | ||
9bb9e8ad | 727 | static void |
7bf0983e | 728 | i386_linux_dr_set_control (unsigned long control) |
84346e11 | 729 | { |
9f0bdab8 DJ |
730 | struct lwp_info *lp; |
731 | ptid_t ptid; | |
732 | ||
733 | i386_linux_dr[DR_CONTROL] = control; | |
734 | ALL_LWPS (lp, ptid) | |
735 | i386_linux_dr_set (ptid, DR_CONTROL, control); | |
84346e11 MK |
736 | } |
737 | ||
a79d3c27 JK |
738 | /* Set address REGNUM (zero based) to ADDR in all LWPs of LWP_LIST. */ |
739 | ||
9bb9e8ad | 740 | static void |
84346e11 MK |
741 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
742 | { | |
9f0bdab8 DJ |
743 | struct lwp_info *lp; |
744 | ptid_t ptid; | |
745 | ||
84346e11 MK |
746 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
747 | ||
9f0bdab8 DJ |
748 | i386_linux_dr[DR_FIRSTADDR + regnum] = addr; |
749 | ALL_LWPS (lp, ptid) | |
750 | i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); | |
84346e11 MK |
751 | } |
752 | ||
a79d3c27 JK |
753 | /* Set address REGNUM (zero based) to zero in all LWPs of LWP_LIST. */ |
754 | ||
9bb9e8ad | 755 | static void |
84346e11 MK |
756 | i386_linux_dr_reset_addr (int regnum) |
757 | { | |
9f0bdab8 | 758 | i386_linux_dr_set_addr (regnum, 0); |
84346e11 MK |
759 | } |
760 | ||
a79d3c27 JK |
761 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ |
762 | ||
9bb9e8ad | 763 | static unsigned long |
84346e11 MK |
764 | i386_linux_dr_get_status (void) |
765 | { | |
9f0bdab8 DJ |
766 | return i386_linux_dr_get (inferior_ptid, DR_STATUS); |
767 | } | |
768 | ||
a79d3c27 JK |
769 | /* Unset MASK bits in DR_STATUS in all LWPs of LWP_LIST. */ |
770 | ||
771 | static void | |
772 | i386_linux_dr_unset_status (unsigned long mask) | |
773 | { | |
774 | struct lwp_info *lp; | |
775 | ptid_t ptid; | |
776 | ||
777 | ALL_LWPS (lp, ptid) | |
778 | { | |
779 | unsigned long value; | |
780 | ||
781 | value = i386_linux_dr_get (ptid, DR_STATUS); | |
782 | value &= ~mask; | |
783 | i386_linux_dr_set (ptid, DR_STATUS, value); | |
784 | } | |
785 | } | |
786 | ||
9f0bdab8 DJ |
787 | static void |
788 | i386_linux_new_thread (ptid_t ptid) | |
789 | { | |
790 | int i; | |
791 | ||
792 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
793 | i386_linux_dr_set (ptid, i, i386_linux_dr[i]); | |
794 | ||
795 | i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]); | |
84346e11 MK |
796 | } |
797 | \f | |
798 | ||
5bca7895 MK |
799 | /* Called by libthread_db. Returns a pointer to the thread local |
800 | storage (or its descriptor). */ | |
801 | ||
802 | ps_err_e | |
803 | ps_get_thread_area (const struct ps_prochandle *ph, | |
804 | lwpid_t lwpid, int idx, void **base) | |
805 | { | |
806 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
807 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
808 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
809 | and a bunch of status bits. | |
810 | ||
811 | The values returned by this ptrace call should be part of the | |
812 | regcache buffer, and ps_get_thread_area should channel its | |
813 | request through the regcache. That way remote targets could | |
814 | provide the value using the remote protocol and not this direct | |
815 | call. | |
816 | ||
817 | Is this function needed? I'm guessing that the `base' is the | |
818 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 819 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
820 | descriptor is defined by the ABI. Anyway, given that |
821 | libthread_db calls this function without prompting (gdb | |
822 | requesting tls base) I guess it needs info in there anyway. */ | |
823 | unsigned int desc[4]; | |
824 | gdb_assert (sizeof (int) == 4); | |
825 | ||
826 | #ifndef PTRACE_GET_THREAD_AREA | |
827 | #define PTRACE_GET_THREAD_AREA 25 | |
828 | #endif | |
829 | ||
830 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
831 | (void *) idx, (unsigned long) &desc) < 0) | |
832 | return PS_ERR; | |
833 | ||
834 | *(int *)base = desc[1]; | |
835 | return PS_OK; | |
836 | } | |
837 | \f | |
838 | ||
a4b6fc86 | 839 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
840 | int $0x80 |
841 | or 0xcd 0x80. */ | |
842 | ||
843 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
844 | ||
845 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
846 | ||
847 | /* The system call number is stored in the %eax register. */ | |
7532965f | 848 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
849 | |
850 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
851 | system calls. */ | |
852 | ||
853 | #ifndef SYS_sigreturn | |
854 | #define SYS_sigreturn 0x77 | |
855 | #endif | |
856 | #ifndef SYS_rt_sigreturn | |
857 | #define SYS_rt_sigreturn 0xad | |
858 | #endif | |
859 | ||
860 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
861 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
862 | ||
863 | /* Resume execution of the inferior process. | |
864 | If STEP is nonzero, single-step it. | |
865 | If SIGNAL is nonzero, give it that signal. */ | |
866 | ||
10d6c8cd | 867 | static void |
28439f5e PA |
868 | i386_linux_resume (struct target_ops *ops, |
869 | ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 870 | { |
39f77062 KB |
871 | int pid = PIDGET (ptid); |
872 | ||
a96d9b2e SDJ |
873 | int request; |
874 | ||
875 | if (catch_syscall_enabled () > 0) | |
876 | request = PTRACE_SYSCALL; | |
877 | else | |
878 | request = PTRACE_CONT; | |
a6abb2c0 | 879 | |
a6abb2c0 MK |
880 | if (step) |
881 | { | |
594f7785 | 882 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
e17a4113 UW |
883 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
884 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7b86a1b8 | 885 | ULONGEST pc; |
8e70166d | 886 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
887 | |
888 | request = PTRACE_SINGLESTEP; | |
889 | ||
e17a4113 UW |
890 | regcache_cooked_read_unsigned (regcache, |
891 | gdbarch_pc_regnum (gdbarch), &pc); | |
7b86a1b8 | 892 | |
a6abb2c0 MK |
893 | /* Returning from a signal trampoline is done by calling a |
894 | special system call (sigreturn or rt_sigreturn, see | |
895 | i386-linux-tdep.c for more information). This system call | |
896 | restores the registers that were saved when the signal was | |
897 | raised, including %eflags. That means that single-stepping | |
898 | won't work. Instead, we'll have to modify the signal context | |
899 | that's about to be restored, and set the trace flag there. */ | |
900 | ||
901 | /* First check if PC is at a system call. */ | |
8defab1a | 902 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
903 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
904 | { | |
7b86a1b8 UW |
905 | ULONGEST syscall; |
906 | regcache_cooked_read_unsigned (regcache, | |
907 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
908 | |
909 | /* Then check the system call number. */ | |
910 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
911 | { | |
7b86a1b8 | 912 | ULONGEST sp, addr; |
a6abb2c0 | 913 | unsigned long int eflags; |
7bf0983e | 914 | |
7b86a1b8 | 915 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 | 916 | if (syscall == SYS_rt_sigreturn) |
e17a4113 | 917 | addr = read_memory_integer (sp + 8, 4, byte_order) + 20; |
7b86a1b8 UW |
918 | else |
919 | addr = sp; | |
a6abb2c0 MK |
920 | |
921 | /* Set the trace flag in the context that's about to be | |
922 | restored. */ | |
923 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 924 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 925 | eflags |= 0x0100; |
8e70166d | 926 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
927 | } |
928 | } | |
929 | } | |
930 | ||
931 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 932 | perror_with_name (("ptrace")); |
a6abb2c0 | 933 | } |
4de4c07c | 934 | |
10d6c8cd DJ |
935 | static void (*super_post_startup_inferior) (ptid_t ptid); |
936 | ||
937 | static void | |
938 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
939 | { |
940 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
941 | super_post_startup_inferior (ptid); |
942 | } | |
943 | ||
90884b2b L |
944 | /* Get Linux/x86 target description from running target. */ |
945 | ||
946 | static const struct target_desc * | |
947 | i386_linux_read_description (struct target_ops *ops) | |
948 | { | |
3a13a53b | 949 | int tid; |
c131fcee L |
950 | static uint64_t xcr0; |
951 | ||
3a13a53b L |
952 | /* GNU/Linux LWP ID's are process ID's. */ |
953 | tid = TIDGET (inferior_ptid); | |
954 | if (tid == 0) | |
955 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
956 | ||
957 | #ifdef HAVE_PTRACE_GETFPXREGS | |
958 | if (have_ptrace_getfpxregs == -1) | |
959 | { | |
960 | elf_fpxregset_t fpxregs; | |
961 | ||
962 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) | |
963 | { | |
964 | have_ptrace_getfpxregs = 0; | |
965 | have_ptrace_getregset = 0; | |
966 | return tdesc_i386_mmx_linux; | |
967 | } | |
968 | } | |
969 | #endif | |
970 | ||
c131fcee L |
971 | if (have_ptrace_getregset == -1) |
972 | { | |
c131fcee L |
973 | uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
974 | struct iovec iov; | |
975 | ||
c131fcee L |
976 | iov.iov_base = xstateregs; |
977 | iov.iov_len = sizeof (xstateregs); | |
978 | ||
979 | /* Check if PTRACE_GETREGSET works. */ | |
980 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
981 | &iov) < 0) | |
982 | have_ptrace_getregset = 0; | |
983 | else | |
984 | { | |
985 | have_ptrace_getregset = 1; | |
986 | ||
987 | /* Get XCR0 from XSAVE extended state. */ | |
988 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET | |
989 | / sizeof (long long))]; | |
990 | } | |
991 | } | |
992 | ||
993 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ | |
994 | if (have_ptrace_getregset | |
995 | && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) | |
996 | return tdesc_i386_avx_linux; | |
997 | else | |
998 | return tdesc_i386_linux; | |
90884b2b L |
999 | } |
1000 | ||
10d6c8cd DJ |
1001 | void |
1002 | _initialize_i386_linux_nat (void) | |
1003 | { | |
1004 | struct target_ops *t; | |
1005 | ||
1006 | /* Fill in the generic GNU/Linux methods. */ | |
1007 | t = linux_target (); | |
1008 | ||
c03374d5 DJ |
1009 | i386_use_watchpoints (t); |
1010 | ||
9bb9e8ad PM |
1011 | i386_dr_low.set_control = i386_linux_dr_set_control; |
1012 | i386_dr_low.set_addr = i386_linux_dr_set_addr; | |
1013 | i386_dr_low.reset_addr = i386_linux_dr_reset_addr; | |
1014 | i386_dr_low.get_status = i386_linux_dr_get_status; | |
a79d3c27 | 1015 | i386_dr_low.unset_status = i386_linux_dr_unset_status; |
9bb9e8ad PM |
1016 | i386_set_debug_register_length (4); |
1017 | ||
10d6c8cd DJ |
1018 | /* Override the default ptrace resume method. */ |
1019 | t->to_resume = i386_linux_resume; | |
1020 | ||
1021 | /* Override the GNU/Linux inferior startup hook. */ | |
1022 | super_post_startup_inferior = t->to_post_startup_inferior; | |
1023 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
1024 | ||
1025 | /* Add our register access methods. */ | |
1026 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
1027 | t->to_store_registers = i386_linux_store_inferior_registers; | |
1028 | ||
90884b2b L |
1029 | t->to_read_description = i386_linux_read_description; |
1030 | ||
10d6c8cd | 1031 | /* Register the target. */ |
f973ed9c | 1032 | linux_nat_add_target (t); |
9f0bdab8 | 1033 | linux_nat_set_new_thread (t, i386_linux_new_thread); |
4de4c07c | 1034 | } |