Commit | Line | Data |
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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 | ||
5c44784c JM |
102 | /* Which ptrace request retrieves which registers? |
103 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 104 | |
5c44784c | 105 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 106 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 107 | |
6ce2ac0b | 108 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 109 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 110 | |
c131fcee L |
111 | #define GETXSTATEREGS_SUPPLIES(regno) \ |
112 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX_NUM_REGS) | |
113 | ||
f60300e7 MK |
114 | /* Does the current host support the GETREGS request? */ |
115 | int have_ptrace_getregs = | |
116 | #ifdef HAVE_PTRACE_GETREGS | |
117 | 1 | |
118 | #else | |
119 | 0 | |
120 | #endif | |
121 | ; | |
122 | ||
6ce2ac0b | 123 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
124 | file may or may not define it, and even if it is defined, the |
125 | kernel will return EIO if it's running on a pre-SSE processor. | |
126 | ||
127 | My instinct is to attach this to some architecture- or | |
128 | target-specific data structure, but really, a particular GDB | |
129 | process can only run on top of one kernel at a time. So it's okay | |
130 | for this to be a simple variable. */ | |
6ce2ac0b MK |
131 | int have_ptrace_getfpxregs = |
132 | #ifdef HAVE_PTRACE_GETFPXREGS | |
3a13a53b | 133 | -1 |
5c44784c JM |
134 | #else |
135 | 0 | |
136 | #endif | |
137 | ; | |
f60300e7 | 138 | \f |
6ce2ac0b | 139 | |
ce556f85 | 140 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
141 | |
142 | /* Fetch one register. */ | |
143 | ||
144 | static void | |
56be3814 | 145 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 146 | { |
f60300e7 | 147 | int tid; |
ce556f85 | 148 | int val; |
f60300e7 | 149 | |
ce556f85 | 150 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 151 | if (i386_linux_gregset_reg_offset[regno] == -1) |
f60300e7 | 152 | { |
56be3814 | 153 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
154 | return; |
155 | } | |
156 | ||
ce556f85 | 157 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
158 | tid = TIDGET (inferior_ptid); |
159 | if (tid == 0) | |
160 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 161 | |
ce556f85 | 162 | errno = 0; |
be0d2954 L |
163 | val = ptrace (PTRACE_PEEKUSER, tid, |
164 | i386_linux_gregset_reg_offset[regno], 0); | |
ce556f85 | 165 | if (errno != 0) |
c9f4d572 | 166 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 167 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 168 | regno, safe_strerror (errno)); |
f60300e7 | 169 | |
56be3814 | 170 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
171 | } |
172 | ||
f60300e7 MK |
173 | /* Store one register. */ |
174 | ||
175 | static void | |
56be3814 | 176 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 177 | { |
f60300e7 | 178 | int tid; |
ce556f85 | 179 | int val; |
f60300e7 | 180 | |
ce556f85 | 181 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 182 | if (i386_linux_gregset_reg_offset[regno] == -1) |
ce556f85 | 183 | return; |
f60300e7 | 184 | |
ce556f85 | 185 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
186 | tid = TIDGET (inferior_ptid); |
187 | if (tid == 0) | |
188 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 189 | |
ce556f85 | 190 | errno = 0; |
56be3814 | 191 | regcache_raw_collect (regcache, regno, &val); |
be0d2954 L |
192 | ptrace (PTRACE_POKEUSER, tid, |
193 | i386_linux_gregset_reg_offset[regno], val); | |
ce556f85 | 194 | if (errno != 0) |
c9f4d572 | 195 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 196 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 197 | regno, safe_strerror (errno)); |
f60300e7 | 198 | } |
5c44784c | 199 | \f |
6ce2ac0b | 200 | |
04cd15b6 MK |
201 | /* Transfering the general-purpose registers between GDB, inferiors |
202 | and core files. */ | |
203 | ||
ad2a4d09 | 204 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 205 | in *GREGSETP. */ |
5c44784c | 206 | |
d4f3574e | 207 | void |
7f7fe91e | 208 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 209 | { |
be0d2954 | 210 | const gdb_byte *regp = (const gdb_byte *) gregsetp; |
6ce2ac0b | 211 | int i; |
d4f3574e | 212 | |
98df6387 | 213 | for (i = 0; i < I386_NUM_GREGS; i++) |
be0d2954 L |
214 | regcache_raw_supply (regcache, i, |
215 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 216 | |
875f8d0e UW |
217 | if (I386_LINUX_ORIG_EAX_REGNUM |
218 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
7f7fe91e | 219 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
be0d2954 | 220 | regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); |
917317f4 JM |
221 | } |
222 | ||
04cd15b6 MK |
223 | /* Fill register REGNO (if it is a general-purpose register) in |
224 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
225 | do this for all registers. */ | |
6ce2ac0b | 226 | |
917317f4 | 227 | void |
7f7fe91e UW |
228 | fill_gregset (const struct regcache *regcache, |
229 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 230 | { |
be0d2954 | 231 | gdb_byte *regp = (gdb_byte *) gregsetp; |
6ce2ac0b | 232 | int i; |
04cd15b6 | 233 | |
98df6387 | 234 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 235 | if (regno == -1 || regno == i) |
be0d2954 L |
236 | regcache_raw_collect (regcache, i, |
237 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 238 | |
82ea117a | 239 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
240 | && I386_LINUX_ORIG_EAX_REGNUM |
241 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
7f7fe91e | 242 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
be0d2954 | 243 | regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); |
d4f3574e SS |
244 | } |
245 | ||
f60300e7 MK |
246 | #ifdef HAVE_PTRACE_GETREGS |
247 | ||
04cd15b6 MK |
248 | /* Fetch all general-purpose registers from process/thread TID and |
249 | store their values in GDB's register array. */ | |
d4f3574e | 250 | |
5c44784c | 251 | static void |
56be3814 | 252 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 253 | { |
04cd15b6 | 254 | elf_gregset_t regs; |
2e024c20 | 255 | elf_gregset_t *regs_p = ®s; |
5c44784c | 256 | |
6ce2ac0b | 257 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 258 | { |
f60300e7 MK |
259 | if (errno == EIO) |
260 | { | |
261 | /* The kernel we're running on doesn't support the GETREGS | |
262 | request. Reset `have_ptrace_getregs'. */ | |
263 | have_ptrace_getregs = 0; | |
264 | return; | |
265 | } | |
266 | ||
e2e0b3e5 | 267 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
268 | } |
269 | ||
2e024c20 | 270 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
271 | } |
272 | ||
04cd15b6 MK |
273 | /* Store all valid general-purpose registers in GDB's register array |
274 | into the process/thread specified by TID. */ | |
5c44784c | 275 | |
5c44784c | 276 | static void |
56be3814 | 277 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 278 | { |
04cd15b6 | 279 | elf_gregset_t regs; |
5c44784c | 280 | |
6ce2ac0b | 281 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 282 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 283 | |
56be3814 | 284 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
285 | |
286 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 287 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
288 | } |
289 | ||
f60300e7 MK |
290 | #else |
291 | ||
56be3814 UW |
292 | static void fetch_regs (struct regcache *regcache, int tid) {} |
293 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
294 | |
295 | #endif | |
5c44784c | 296 | \f |
5c44784c | 297 | |
6ce2ac0b | 298 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 299 | |
04cd15b6 | 300 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 301 | *FPREGSETP. */ |
04cd15b6 | 302 | |
d4f3574e | 303 | void |
7f7fe91e | 304 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 305 | { |
7f7fe91e | 306 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 307 | } |
d4f3574e | 308 | |
04cd15b6 MK |
309 | /* Fill register REGNO (if it is a floating-point register) in |
310 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
311 | do this for all registers. */ | |
917317f4 JM |
312 | |
313 | void | |
7f7fe91e UW |
314 | fill_fpregset (const struct regcache *regcache, |
315 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 316 | { |
7f7fe91e | 317 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
318 | } |
319 | ||
f60300e7 MK |
320 | #ifdef HAVE_PTRACE_GETREGS |
321 | ||
04cd15b6 MK |
322 | /* Fetch all floating-point registers from process/thread TID and store |
323 | thier values in GDB's register array. */ | |
917317f4 | 324 | |
d4f3574e | 325 | static void |
56be3814 | 326 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 327 | { |
04cd15b6 | 328 | elf_fpregset_t fpregs; |
d4f3574e | 329 | |
6ce2ac0b | 330 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 331 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 332 | |
56be3814 | 333 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
334 | } |
335 | ||
04cd15b6 MK |
336 | /* Store all valid floating-point registers in GDB's register array |
337 | into the process/thread specified by TID. */ | |
d4f3574e | 338 | |
d4f3574e | 339 | static void |
56be3814 | 340 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 341 | { |
04cd15b6 | 342 | elf_fpregset_t fpregs; |
d4f3574e | 343 | |
6ce2ac0b | 344 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 345 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 346 | |
56be3814 | 347 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 348 | |
6ce2ac0b | 349 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 350 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
351 | } |
352 | ||
f60300e7 MK |
353 | #else |
354 | ||
56be3814 UW |
355 | static void fetch_fpregs (struct regcache *regcache, int tid) {} |
356 | static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} | |
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 MK |
415 | |
416 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 417 | values in *FPXREGSETP. */ |
04cd15b6 | 418 | |
975aec09 | 419 | void |
7f7fe91e UW |
420 | supply_fpxregset (struct regcache *regcache, |
421 | const elf_fpxregset_t *fpxregsetp) | |
d4f3574e | 422 | { |
7f7fe91e | 423 | i387_supply_fxsave (regcache, -1, fpxregsetp); |
d4f3574e SS |
424 | } |
425 | ||
6ce2ac0b MK |
426 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
427 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
428 | -1, do this for all registers. */ | |
d4f3574e | 429 | |
975aec09 | 430 | void |
7f7fe91e UW |
431 | fill_fpxregset (const struct regcache *regcache, |
432 | elf_fpxregset_t *fpxregsetp, int regno) | |
d4f3574e | 433 | { |
7f7fe91e | 434 | i387_collect_fxsave (regcache, regno, fpxregsetp); |
5c44784c JM |
435 | } |
436 | ||
6ce2ac0b | 437 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
438 | process/thread TID and store their values in GDB's register array. |
439 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 440 | |
5c44784c | 441 | static int |
56be3814 | 442 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 443 | { |
6ce2ac0b | 444 | elf_fpxregset_t fpxregs; |
5c44784c | 445 | |
6ce2ac0b | 446 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
447 | return 0; |
448 | ||
6ce2ac0b | 449 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 450 | { |
5c44784c JM |
451 | if (errno == EIO) |
452 | { | |
6ce2ac0b | 453 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
454 | return 0; |
455 | } | |
456 | ||
e2e0b3e5 | 457 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
458 | } |
459 | ||
56be3814 | 460 | supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
461 | return 1; |
462 | } | |
d4f3574e | 463 | |
04cd15b6 | 464 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 465 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 466 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 467 | |
5c44784c | 468 | static int |
56be3814 | 469 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 470 | { |
6ce2ac0b | 471 | elf_fpxregset_t fpxregs; |
5c44784c | 472 | |
6ce2ac0b | 473 | if (! have_ptrace_getfpxregs) |
5c44784c | 474 | return 0; |
6ce2ac0b MK |
475 | |
476 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
477 | { |
478 | if (errno == EIO) | |
479 | { | |
480 | have_ptrace_getfpxregs = 0; | |
481 | return 0; | |
482 | } | |
483 | ||
e2e0b3e5 | 484 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 485 | } |
5c44784c | 486 | |
56be3814 | 487 | fill_fpxregset (regcache, &fpxregs, regno); |
5c44784c | 488 | |
6ce2ac0b | 489 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 490 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
491 | |
492 | return 1; | |
493 | } | |
494 | ||
5c44784c JM |
495 | #else |
496 | ||
56be3814 UW |
497 | static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } |
498 | static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } | |
5c44784c | 499 | |
6ce2ac0b | 500 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 501 | \f |
6ce2ac0b | 502 | |
5c44784c | 503 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 504 | |
04cd15b6 MK |
505 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
506 | this for all registers (including the floating point and SSE | |
507 | registers). */ | |
d4f3574e | 508 | |
10d6c8cd | 509 | static void |
28439f5e PA |
510 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
511 | struct regcache *regcache, int regno) | |
d4f3574e | 512 | { |
ed9a39eb JM |
513 | int tid; |
514 | ||
f60300e7 MK |
515 | /* Use the old method of peeking around in `struct user' if the |
516 | GETREGS request isn't available. */ | |
ce556f85 | 517 | if (!have_ptrace_getregs) |
f60300e7 | 518 | { |
ce556f85 MK |
519 | int i; |
520 | ||
875f8d0e | 521 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 522 | if (regno == -1 || regno == i) |
56be3814 | 523 | fetch_register (regcache, i); |
ce556f85 | 524 | |
f60300e7 MK |
525 | return; |
526 | } | |
527 | ||
a4b6fc86 | 528 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
529 | tid = TIDGET (inferior_ptid); |
530 | if (tid == 0) | |
531 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 532 | |
6ce2ac0b | 533 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 534 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 535 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 536 | zero. */ |
5c44784c JM |
537 | if (regno == -1) |
538 | { | |
56be3814 | 539 | fetch_regs (regcache, tid); |
f60300e7 MK |
540 | |
541 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 542 | if (!have_ptrace_getregs) |
f60300e7 | 543 | { |
84e473c8 | 544 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
545 | return; |
546 | } | |
547 | ||
c131fcee L |
548 | if (fetch_xstateregs (regcache, tid)) |
549 | return; | |
56be3814 | 550 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 551 | return; |
56be3814 | 552 | fetch_fpregs (regcache, tid); |
5c44784c JM |
553 | return; |
554 | } | |
d4f3574e | 555 | |
5c44784c JM |
556 | if (GETREGS_SUPPLIES (regno)) |
557 | { | |
56be3814 | 558 | fetch_regs (regcache, tid); |
5c44784c JM |
559 | return; |
560 | } | |
561 | ||
c131fcee L |
562 | if (GETXSTATEREGS_SUPPLIES (regno)) |
563 | { | |
564 | if (fetch_xstateregs (regcache, tid)) | |
565 | return; | |
566 | } | |
567 | ||
6ce2ac0b | 568 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 569 | { |
56be3814 | 570 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
571 | return; |
572 | ||
573 | /* Either our processor or our kernel doesn't support the SSE | |
574 | registers, so read the FP registers in the traditional way, | |
575 | and fill the SSE registers with dummy values. It would be | |
576 | more graceful to handle differences in the register set using | |
577 | gdbarch. Until then, this will at least make things work | |
578 | plausibly. */ | |
56be3814 | 579 | fetch_fpregs (regcache, tid); |
5c44784c JM |
580 | return; |
581 | } | |
582 | ||
8e65ff28 | 583 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 584 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
585 | } |
586 | ||
04cd15b6 MK |
587 | /* Store register REGNO back into the child process. If REGNO is -1, |
588 | do this for all registers (including the floating point and SSE | |
589 | registers). */ | |
10d6c8cd | 590 | static void |
28439f5e PA |
591 | i386_linux_store_inferior_registers (struct target_ops *ops, |
592 | struct regcache *regcache, int regno) | |
d4f3574e | 593 | { |
ed9a39eb JM |
594 | int tid; |
595 | ||
f60300e7 MK |
596 | /* Use the old method of poking around in `struct user' if the |
597 | SETREGS request isn't available. */ | |
ce556f85 | 598 | if (!have_ptrace_getregs) |
f60300e7 | 599 | { |
ce556f85 MK |
600 | int i; |
601 | ||
875f8d0e | 602 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 603 | if (regno == -1 || regno == i) |
56be3814 | 604 | store_register (regcache, i); |
ce556f85 | 605 | |
f60300e7 MK |
606 | return; |
607 | } | |
608 | ||
a4b6fc86 | 609 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
610 | tid = TIDGET (inferior_ptid); |
611 | if (tid == 0) | |
612 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 613 | |
6ce2ac0b | 614 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 615 | transfers more registers in one system call. But remember that |
6ce2ac0b | 616 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
617 | if (regno == -1) |
618 | { | |
56be3814 | 619 | store_regs (regcache, tid, regno); |
c131fcee L |
620 | if (store_xstateregs (regcache, tid, regno)) |
621 | return; | |
56be3814 | 622 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c | 623 | return; |
56be3814 | 624 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
625 | return; |
626 | } | |
d4f3574e | 627 | |
5c44784c JM |
628 | if (GETREGS_SUPPLIES (regno)) |
629 | { | |
56be3814 | 630 | store_regs (regcache, tid, regno); |
5c44784c JM |
631 | return; |
632 | } | |
633 | ||
c131fcee L |
634 | if (GETXSTATEREGS_SUPPLIES (regno)) |
635 | { | |
636 | if (store_xstateregs (regcache, tid, regno)) | |
637 | return; | |
638 | } | |
639 | ||
6ce2ac0b | 640 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 641 | { |
56be3814 | 642 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
643 | return; |
644 | ||
645 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
646 | registers, so just write the FP registers in the traditional |
647 | way. */ | |
56be3814 | 648 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
649 | return; |
650 | } | |
651 | ||
8e65ff28 | 652 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 653 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 654 | } |
de57eccd | 655 | \f |
6ce2ac0b | 656 | |
4ffc8466 MK |
657 | /* Support for debug registers. */ |
658 | ||
9f0bdab8 DJ |
659 | static unsigned long i386_linux_dr[DR_CONTROL + 1]; |
660 | ||
a79d3c27 JK |
661 | /* Get debug register REGNUM value from only the one LWP of PTID. */ |
662 | ||
7bf0983e | 663 | static unsigned long |
9f0bdab8 | 664 | i386_linux_dr_get (ptid_t ptid, int regnum) |
84346e11 MK |
665 | { |
666 | int tid; | |
7bf0983e | 667 | unsigned long value; |
84346e11 | 668 | |
9f0bdab8 DJ |
669 | tid = TIDGET (ptid); |
670 | if (tid == 0) | |
671 | tid = PIDGET (ptid); | |
84346e11 | 672 | |
b9511b9a MK |
673 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
674 | ptrace call fails breaks debugging remote targets. The correct | |
675 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 676 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 677 | ptrace call fails. */ |
84346e11 | 678 | errno = 0; |
ce556f85 | 679 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
680 | offsetof (struct user, u_debugreg[regnum]), 0); |
681 | if (errno != 0) | |
b9511b9a | 682 | #if 0 |
e2e0b3e5 | 683 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
684 | #else |
685 | return 0; | |
686 | #endif | |
84346e11 MK |
687 | |
688 | return value; | |
689 | } | |
690 | ||
a79d3c27 JK |
691 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ |
692 | ||
84346e11 | 693 | static void |
9f0bdab8 | 694 | i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
84346e11 MK |
695 | { |
696 | int tid; | |
697 | ||
9f0bdab8 DJ |
698 | tid = TIDGET (ptid); |
699 | if (tid == 0) | |
700 | tid = PIDGET (ptid); | |
84346e11 MK |
701 | |
702 | errno = 0; | |
ce556f85 | 703 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
704 | offsetof (struct user, u_debugreg[regnum]), value); |
705 | if (errno != 0) | |
e2e0b3e5 | 706 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
707 | } |
708 | ||
a79d3c27 JK |
709 | /* Set DR_CONTROL to ADDR in all LWPs of LWP_LIST. */ |
710 | ||
9bb9e8ad | 711 | static void |
7bf0983e | 712 | i386_linux_dr_set_control (unsigned long control) |
84346e11 | 713 | { |
9f0bdab8 DJ |
714 | struct lwp_info *lp; |
715 | ptid_t ptid; | |
716 | ||
717 | i386_linux_dr[DR_CONTROL] = control; | |
718 | ALL_LWPS (lp, ptid) | |
719 | i386_linux_dr_set (ptid, DR_CONTROL, control); | |
84346e11 MK |
720 | } |
721 | ||
a79d3c27 JK |
722 | /* Set address REGNUM (zero based) to ADDR in all LWPs of LWP_LIST. */ |
723 | ||
9bb9e8ad | 724 | static void |
84346e11 MK |
725 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
726 | { | |
9f0bdab8 DJ |
727 | struct lwp_info *lp; |
728 | ptid_t ptid; | |
729 | ||
84346e11 MK |
730 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
731 | ||
9f0bdab8 DJ |
732 | i386_linux_dr[DR_FIRSTADDR + regnum] = addr; |
733 | ALL_LWPS (lp, ptid) | |
734 | i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); | |
84346e11 MK |
735 | } |
736 | ||
a79d3c27 JK |
737 | /* Set address REGNUM (zero based) to zero in all LWPs of LWP_LIST. */ |
738 | ||
9bb9e8ad | 739 | static void |
84346e11 MK |
740 | i386_linux_dr_reset_addr (int regnum) |
741 | { | |
9f0bdab8 | 742 | i386_linux_dr_set_addr (regnum, 0); |
84346e11 MK |
743 | } |
744 | ||
a79d3c27 JK |
745 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ |
746 | ||
9bb9e8ad | 747 | static unsigned long |
84346e11 MK |
748 | i386_linux_dr_get_status (void) |
749 | { | |
9f0bdab8 DJ |
750 | return i386_linux_dr_get (inferior_ptid, DR_STATUS); |
751 | } | |
752 | ||
a79d3c27 JK |
753 | /* Unset MASK bits in DR_STATUS in all LWPs of LWP_LIST. */ |
754 | ||
755 | static void | |
756 | i386_linux_dr_unset_status (unsigned long mask) | |
757 | { | |
758 | struct lwp_info *lp; | |
759 | ptid_t ptid; | |
760 | ||
761 | ALL_LWPS (lp, ptid) | |
762 | { | |
763 | unsigned long value; | |
764 | ||
765 | value = i386_linux_dr_get (ptid, DR_STATUS); | |
766 | value &= ~mask; | |
767 | i386_linux_dr_set (ptid, DR_STATUS, value); | |
768 | } | |
769 | } | |
770 | ||
9f0bdab8 DJ |
771 | static void |
772 | i386_linux_new_thread (ptid_t ptid) | |
773 | { | |
774 | int i; | |
775 | ||
776 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
777 | i386_linux_dr_set (ptid, i, i386_linux_dr[i]); | |
778 | ||
779 | i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]); | |
84346e11 MK |
780 | } |
781 | \f | |
782 | ||
5bca7895 MK |
783 | /* Called by libthread_db. Returns a pointer to the thread local |
784 | storage (or its descriptor). */ | |
785 | ||
786 | ps_err_e | |
787 | ps_get_thread_area (const struct ps_prochandle *ph, | |
788 | lwpid_t lwpid, int idx, void **base) | |
789 | { | |
790 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
791 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
792 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
793 | and a bunch of status bits. | |
794 | ||
795 | The values returned by this ptrace call should be part of the | |
796 | regcache buffer, and ps_get_thread_area should channel its | |
797 | request through the regcache. That way remote targets could | |
798 | provide the value using the remote protocol and not this direct | |
799 | call. | |
800 | ||
801 | Is this function needed? I'm guessing that the `base' is the | |
802 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 803 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
804 | descriptor is defined by the ABI. Anyway, given that |
805 | libthread_db calls this function without prompting (gdb | |
806 | requesting tls base) I guess it needs info in there anyway. */ | |
807 | unsigned int desc[4]; | |
808 | gdb_assert (sizeof (int) == 4); | |
809 | ||
810 | #ifndef PTRACE_GET_THREAD_AREA | |
811 | #define PTRACE_GET_THREAD_AREA 25 | |
812 | #endif | |
813 | ||
814 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
815 | (void *) idx, (unsigned long) &desc) < 0) | |
816 | return PS_ERR; | |
817 | ||
818 | *(int *)base = desc[1]; | |
819 | return PS_OK; | |
820 | } | |
821 | \f | |
822 | ||
a4b6fc86 | 823 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
824 | int $0x80 |
825 | or 0xcd 0x80. */ | |
826 | ||
827 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
828 | ||
829 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
830 | ||
831 | /* The system call number is stored in the %eax register. */ | |
7532965f | 832 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
833 | |
834 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
835 | system calls. */ | |
836 | ||
837 | #ifndef SYS_sigreturn | |
838 | #define SYS_sigreturn 0x77 | |
839 | #endif | |
840 | #ifndef SYS_rt_sigreturn | |
841 | #define SYS_rt_sigreturn 0xad | |
842 | #endif | |
843 | ||
844 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
845 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
846 | ||
847 | /* Resume execution of the inferior process. | |
848 | If STEP is nonzero, single-step it. | |
849 | If SIGNAL is nonzero, give it that signal. */ | |
850 | ||
10d6c8cd | 851 | static void |
28439f5e PA |
852 | i386_linux_resume (struct target_ops *ops, |
853 | ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 854 | { |
39f77062 KB |
855 | int pid = PIDGET (ptid); |
856 | ||
a96d9b2e SDJ |
857 | int request; |
858 | ||
859 | if (catch_syscall_enabled () > 0) | |
860 | request = PTRACE_SYSCALL; | |
861 | else | |
862 | request = PTRACE_CONT; | |
a6abb2c0 | 863 | |
a6abb2c0 MK |
864 | if (step) |
865 | { | |
594f7785 | 866 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
e17a4113 UW |
867 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
868 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7b86a1b8 | 869 | ULONGEST pc; |
8e70166d | 870 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
871 | |
872 | request = PTRACE_SINGLESTEP; | |
873 | ||
e17a4113 UW |
874 | regcache_cooked_read_unsigned (regcache, |
875 | gdbarch_pc_regnum (gdbarch), &pc); | |
7b86a1b8 | 876 | |
a6abb2c0 MK |
877 | /* Returning from a signal trampoline is done by calling a |
878 | special system call (sigreturn or rt_sigreturn, see | |
879 | i386-linux-tdep.c for more information). This system call | |
880 | restores the registers that were saved when the signal was | |
881 | raised, including %eflags. That means that single-stepping | |
882 | won't work. Instead, we'll have to modify the signal context | |
883 | that's about to be restored, and set the trace flag there. */ | |
884 | ||
885 | /* First check if PC is at a system call. */ | |
8defab1a | 886 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
887 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
888 | { | |
7b86a1b8 UW |
889 | ULONGEST syscall; |
890 | regcache_cooked_read_unsigned (regcache, | |
891 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
892 | |
893 | /* Then check the system call number. */ | |
894 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
895 | { | |
7b86a1b8 | 896 | ULONGEST sp, addr; |
a6abb2c0 | 897 | unsigned long int eflags; |
7bf0983e | 898 | |
7b86a1b8 | 899 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 | 900 | if (syscall == SYS_rt_sigreturn) |
e17a4113 | 901 | addr = read_memory_integer (sp + 8, 4, byte_order) + 20; |
7b86a1b8 UW |
902 | else |
903 | addr = sp; | |
a6abb2c0 MK |
904 | |
905 | /* Set the trace flag in the context that's about to be | |
906 | restored. */ | |
907 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 908 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 909 | eflags |= 0x0100; |
8e70166d | 910 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
911 | } |
912 | } | |
913 | } | |
914 | ||
915 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 916 | perror_with_name (("ptrace")); |
a6abb2c0 | 917 | } |
4de4c07c | 918 | |
10d6c8cd DJ |
919 | static void (*super_post_startup_inferior) (ptid_t ptid); |
920 | ||
921 | static void | |
922 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
923 | { |
924 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
925 | super_post_startup_inferior (ptid); |
926 | } | |
927 | ||
90884b2b L |
928 | /* Get Linux/x86 target description from running target. */ |
929 | ||
930 | static const struct target_desc * | |
931 | i386_linux_read_description (struct target_ops *ops) | |
932 | { | |
3a13a53b | 933 | int tid; |
c131fcee L |
934 | static uint64_t xcr0; |
935 | ||
3a13a53b L |
936 | /* GNU/Linux LWP ID's are process ID's. */ |
937 | tid = TIDGET (inferior_ptid); | |
938 | if (tid == 0) | |
939 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
940 | ||
941 | #ifdef HAVE_PTRACE_GETFPXREGS | |
942 | if (have_ptrace_getfpxregs == -1) | |
943 | { | |
944 | elf_fpxregset_t fpxregs; | |
945 | ||
946 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) | |
947 | { | |
948 | have_ptrace_getfpxregs = 0; | |
949 | have_ptrace_getregset = 0; | |
950 | return tdesc_i386_mmx_linux; | |
951 | } | |
952 | } | |
953 | #endif | |
954 | ||
c131fcee L |
955 | if (have_ptrace_getregset == -1) |
956 | { | |
c131fcee L |
957 | uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
958 | struct iovec iov; | |
959 | ||
c131fcee L |
960 | iov.iov_base = xstateregs; |
961 | iov.iov_len = sizeof (xstateregs); | |
962 | ||
963 | /* Check if PTRACE_GETREGSET works. */ | |
964 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
965 | &iov) < 0) | |
966 | have_ptrace_getregset = 0; | |
967 | else | |
968 | { | |
969 | have_ptrace_getregset = 1; | |
970 | ||
971 | /* Get XCR0 from XSAVE extended state. */ | |
972 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET | |
973 | / sizeof (long long))]; | |
974 | } | |
975 | } | |
976 | ||
977 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ | |
978 | if (have_ptrace_getregset | |
979 | && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) | |
980 | return tdesc_i386_avx_linux; | |
981 | else | |
982 | return tdesc_i386_linux; | |
90884b2b L |
983 | } |
984 | ||
10d6c8cd DJ |
985 | void |
986 | _initialize_i386_linux_nat (void) | |
987 | { | |
988 | struct target_ops *t; | |
989 | ||
990 | /* Fill in the generic GNU/Linux methods. */ | |
991 | t = linux_target (); | |
992 | ||
c03374d5 DJ |
993 | i386_use_watchpoints (t); |
994 | ||
9bb9e8ad PM |
995 | i386_dr_low.set_control = i386_linux_dr_set_control; |
996 | i386_dr_low.set_addr = i386_linux_dr_set_addr; | |
997 | i386_dr_low.reset_addr = i386_linux_dr_reset_addr; | |
998 | i386_dr_low.get_status = i386_linux_dr_get_status; | |
a79d3c27 | 999 | i386_dr_low.unset_status = i386_linux_dr_unset_status; |
9bb9e8ad PM |
1000 | i386_set_debug_register_length (4); |
1001 | ||
10d6c8cd DJ |
1002 | /* Override the default ptrace resume method. */ |
1003 | t->to_resume = i386_linux_resume; | |
1004 | ||
1005 | /* Override the GNU/Linux inferior startup hook. */ | |
1006 | super_post_startup_inferior = t->to_post_startup_inferior; | |
1007 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
1008 | ||
1009 | /* Add our register access methods. */ | |
1010 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
1011 | t->to_store_registers = i386_linux_store_inferior_registers; | |
1012 | ||
90884b2b L |
1013 | t->to_read_description = i386_linux_read_description; |
1014 | ||
10d6c8cd | 1015 | /* Register the target. */ |
f973ed9c | 1016 | linux_nat_add_target (t); |
9f0bdab8 | 1017 | linux_nat_set_new_thread (t, i386_linux_new_thread); |
4de4c07c | 1018 | } |