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, |
7b6bb8da | 4 | 2009, 2010, 2011 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 | ||
6ce2ac0b | 50 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
51 | #include "gregset.h" |
52 | ||
e750d25e | 53 | #include "i387-tdep.h" |
c3833324 | 54 | #include "i386-tdep.h" |
5179e78f AC |
55 | #include "i386-linux-tdep.h" |
56 | ||
b757528f JJ |
57 | /* Defines ps_err_e, struct ps_prochandle. */ |
58 | #include "gdb_proc_service.h" | |
c131fcee L |
59 | |
60 | #include "i386-xstate.h" | |
61 | ||
62 | #ifndef PTRACE_GETREGSET | |
63 | #define PTRACE_GETREGSET 0x4204 | |
64 | #endif | |
65 | ||
66 | #ifndef PTRACE_SETREGSET | |
67 | #define PTRACE_SETREGSET 0x4205 | |
68 | #endif | |
69 | ||
7b50312a PA |
70 | /* Per-thread arch-specific data we want to keep. */ |
71 | ||
72 | struct arch_lwp_info | |
73 | { | |
74 | /* Non-zero if our copy differs from what's recorded in the thread. */ | |
75 | int debug_registers_changed; | |
76 | }; | |
77 | ||
c131fcee L |
78 | /* Does the current host support PTRACE_GETREGSET? */ |
79 | static int have_ptrace_getregset = -1; | |
6ce2ac0b | 80 | \f |
d4f3574e | 81 | |
a4b6fc86 AC |
82 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
83 | the register sets in `struct user' that is used for a.out | |
84 | core-dumps, and is also used by `ptrace'. The corresponding types | |
85 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
86 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
87 | for the floating-point registers. | |
88 | ||
89 | Those types used to be available under the names `gregset_t' and | |
90 | `fpregset_t' too, and this file used those names in the past. But | |
91 | those names are now used for the register sets used in the | |
92 | `mcontext_t' type, and have a different size and layout. */ | |
93 | ||
5c44784c JM |
94 | /* Which ptrace request retrieves which registers? |
95 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 96 | |
5c44784c | 97 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 98 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 99 | |
6ce2ac0b | 100 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 101 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 102 | |
c131fcee L |
103 | #define GETXSTATEREGS_SUPPLIES(regno) \ |
104 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_AVX_NUM_REGS) | |
105 | ||
f60300e7 MK |
106 | /* Does the current host support the GETREGS request? */ |
107 | int have_ptrace_getregs = | |
108 | #ifdef HAVE_PTRACE_GETREGS | |
109 | 1 | |
110 | #else | |
111 | 0 | |
112 | #endif | |
113 | ; | |
114 | ||
6ce2ac0b | 115 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
116 | file may or may not define it, and even if it is defined, the |
117 | kernel will return EIO if it's running on a pre-SSE processor. | |
118 | ||
119 | My instinct is to attach this to some architecture- or | |
120 | target-specific data structure, but really, a particular GDB | |
121 | process can only run on top of one kernel at a time. So it's okay | |
122 | for this to be a simple variable. */ | |
6ce2ac0b MK |
123 | int have_ptrace_getfpxregs = |
124 | #ifdef HAVE_PTRACE_GETFPXREGS | |
3a13a53b | 125 | -1 |
5c44784c JM |
126 | #else |
127 | 0 | |
128 | #endif | |
129 | ; | |
f60300e7 | 130 | \f |
6ce2ac0b | 131 | |
ce556f85 | 132 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
133 | |
134 | /* Fetch one register. */ | |
135 | ||
136 | static void | |
56be3814 | 137 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 138 | { |
f60300e7 | 139 | int tid; |
ce556f85 | 140 | int val; |
f60300e7 | 141 | |
ce556f85 | 142 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 143 | if (i386_linux_gregset_reg_offset[regno] == -1) |
f60300e7 | 144 | { |
56be3814 | 145 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
146 | return; |
147 | } | |
148 | ||
ce556f85 | 149 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
150 | tid = TIDGET (inferior_ptid); |
151 | if (tid == 0) | |
152 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 153 | |
ce556f85 | 154 | errno = 0; |
be0d2954 L |
155 | val = ptrace (PTRACE_PEEKUSER, tid, |
156 | i386_linux_gregset_reg_offset[regno], 0); | |
ce556f85 | 157 | if (errno != 0) |
c9f4d572 | 158 | error (_("Couldn't read register %s (#%d): %s."), |
875f8d0e | 159 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 160 | regno, safe_strerror (errno)); |
f60300e7 | 161 | |
56be3814 | 162 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
163 | } |
164 | ||
1777feb0 | 165 | /* Store one register. */ |
f60300e7 MK |
166 | |
167 | static void | |
56be3814 | 168 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 169 | { |
f60300e7 | 170 | int tid; |
ce556f85 | 171 | int val; |
f60300e7 | 172 | |
ce556f85 | 173 | gdb_assert (!have_ptrace_getregs); |
be0d2954 | 174 | if (i386_linux_gregset_reg_offset[regno] == -1) |
ce556f85 | 175 | return; |
f60300e7 | 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; |
56be3814 | 183 | regcache_raw_collect (regcache, regno, &val); |
be0d2954 L |
184 | ptrace (PTRACE_POKEUSER, tid, |
185 | i386_linux_gregset_reg_offset[regno], val); | |
ce556f85 | 186 | if (errno != 0) |
c9f4d572 | 187 | error (_("Couldn't write register %s (#%d): %s."), |
875f8d0e | 188 | gdbarch_register_name (get_regcache_arch (regcache), regno), |
ce556f85 | 189 | regno, safe_strerror (errno)); |
f60300e7 | 190 | } |
5c44784c | 191 | \f |
6ce2ac0b | 192 | |
04cd15b6 MK |
193 | /* Transfering the general-purpose registers between GDB, inferiors |
194 | and core files. */ | |
195 | ||
ad2a4d09 | 196 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 197 | in *GREGSETP. */ |
5c44784c | 198 | |
d4f3574e | 199 | void |
7f7fe91e | 200 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 201 | { |
be0d2954 | 202 | const gdb_byte *regp = (const gdb_byte *) gregsetp; |
6ce2ac0b | 203 | int i; |
d4f3574e | 204 | |
98df6387 | 205 | for (i = 0; i < I386_NUM_GREGS; i++) |
be0d2954 L |
206 | regcache_raw_supply (regcache, i, |
207 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 208 | |
875f8d0e UW |
209 | if (I386_LINUX_ORIG_EAX_REGNUM |
210 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
211 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
212 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
917317f4 JM |
213 | } |
214 | ||
04cd15b6 MK |
215 | /* Fill register REGNO (if it is a general-purpose register) in |
216 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
217 | do this for all registers. */ | |
6ce2ac0b | 218 | |
917317f4 | 219 | void |
7f7fe91e UW |
220 | fill_gregset (const struct regcache *regcache, |
221 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 222 | { |
be0d2954 | 223 | gdb_byte *regp = (gdb_byte *) gregsetp; |
6ce2ac0b | 224 | int i; |
04cd15b6 | 225 | |
98df6387 | 226 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 227 | if (regno == -1 || regno == i) |
be0d2954 L |
228 | regcache_raw_collect (regcache, i, |
229 | regp + i386_linux_gregset_reg_offset[i]); | |
3fb1c838 | 230 | |
82ea117a | 231 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
875f8d0e UW |
232 | && I386_LINUX_ORIG_EAX_REGNUM |
233 | < gdbarch_num_regs (get_regcache_arch (regcache))) | |
1777feb0 MS |
234 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp |
235 | + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]); | |
d4f3574e SS |
236 | } |
237 | ||
f60300e7 MK |
238 | #ifdef HAVE_PTRACE_GETREGS |
239 | ||
04cd15b6 MK |
240 | /* Fetch all general-purpose registers from process/thread TID and |
241 | store their values in GDB's register array. */ | |
d4f3574e | 242 | |
5c44784c | 243 | static void |
56be3814 | 244 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 245 | { |
04cd15b6 | 246 | elf_gregset_t regs; |
2e024c20 | 247 | elf_gregset_t *regs_p = ®s; |
5c44784c | 248 | |
6ce2ac0b | 249 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 250 | { |
f60300e7 MK |
251 | if (errno == EIO) |
252 | { | |
253 | /* The kernel we're running on doesn't support the GETREGS | |
254 | request. Reset `have_ptrace_getregs'. */ | |
255 | have_ptrace_getregs = 0; | |
256 | return; | |
257 | } | |
258 | ||
e2e0b3e5 | 259 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
260 | } |
261 | ||
2e024c20 | 262 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
263 | } |
264 | ||
04cd15b6 MK |
265 | /* Store all valid general-purpose registers in GDB's register array |
266 | into the process/thread specified by TID. */ | |
5c44784c | 267 | |
5c44784c | 268 | static void |
56be3814 | 269 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 270 | { |
04cd15b6 | 271 | elf_gregset_t regs; |
5c44784c | 272 | |
6ce2ac0b | 273 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 274 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 275 | |
56be3814 | 276 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
277 | |
278 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 279 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
280 | } |
281 | ||
f60300e7 MK |
282 | #else |
283 | ||
56be3814 UW |
284 | static void fetch_regs (struct regcache *regcache, int tid) {} |
285 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
286 | |
287 | #endif | |
5c44784c | 288 | \f |
5c44784c | 289 | |
6ce2ac0b | 290 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 291 | |
04cd15b6 | 292 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 293 | *FPREGSETP. */ |
04cd15b6 | 294 | |
d4f3574e | 295 | void |
7f7fe91e | 296 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 297 | { |
7f7fe91e | 298 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 299 | } |
d4f3574e | 300 | |
04cd15b6 MK |
301 | /* Fill register REGNO (if it is a floating-point register) in |
302 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
303 | do this for all registers. */ | |
917317f4 JM |
304 | |
305 | void | |
7f7fe91e UW |
306 | fill_fpregset (const struct regcache *regcache, |
307 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 308 | { |
7f7fe91e | 309 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
310 | } |
311 | ||
f60300e7 MK |
312 | #ifdef HAVE_PTRACE_GETREGS |
313 | ||
04cd15b6 MK |
314 | /* Fetch all floating-point registers from process/thread TID and store |
315 | thier values in GDB's register array. */ | |
917317f4 | 316 | |
d4f3574e | 317 | static void |
56be3814 | 318 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 319 | { |
04cd15b6 | 320 | elf_fpregset_t fpregs; |
d4f3574e | 321 | |
6ce2ac0b | 322 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 323 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 324 | |
56be3814 | 325 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
326 | } |
327 | ||
04cd15b6 MK |
328 | /* Store all valid floating-point registers in GDB's register array |
329 | into the process/thread specified by TID. */ | |
d4f3574e | 330 | |
d4f3574e | 331 | static void |
56be3814 | 332 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 333 | { |
04cd15b6 | 334 | elf_fpregset_t fpregs; |
d4f3574e | 335 | |
6ce2ac0b | 336 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 337 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 338 | |
56be3814 | 339 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 340 | |
6ce2ac0b | 341 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 342 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
343 | } |
344 | ||
f60300e7 MK |
345 | #else |
346 | ||
1777feb0 MS |
347 | static void |
348 | fetch_fpregs (struct regcache *regcache, int tid) | |
349 | { | |
350 | } | |
351 | ||
352 | static void | |
353 | store_fpregs (const struct regcache *regcache, int tid, int regno) | |
354 | { | |
355 | } | |
f60300e7 MK |
356 | |
357 | #endif | |
5c44784c | 358 | \f |
d4f3574e | 359 | |
6ce2ac0b | 360 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 361 | |
c131fcee L |
362 | /* Fetch all registers covered by the PTRACE_GETREGSET request from |
363 | process/thread TID and store their values in GDB's register array. | |
364 | Return non-zero if successful, zero otherwise. */ | |
365 | ||
366 | static int | |
367 | fetch_xstateregs (struct regcache *regcache, int tid) | |
368 | { | |
369 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
370 | struct iovec iov; | |
371 | ||
372 | if (!have_ptrace_getregset) | |
373 | return 0; | |
374 | ||
375 | iov.iov_base = xstateregs; | |
376 | iov.iov_len = sizeof(xstateregs); | |
377 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
378 | &iov) < 0) | |
379 | perror_with_name (_("Couldn't read extended state status")); | |
380 | ||
381 | i387_supply_xsave (regcache, -1, xstateregs); | |
382 | return 1; | |
383 | } | |
384 | ||
385 | /* Store all valid registers in GDB's register array covered by the | |
386 | PTRACE_SETREGSET request into the process/thread specified by TID. | |
387 | Return non-zero if successful, zero otherwise. */ | |
388 | ||
389 | static int | |
390 | store_xstateregs (const struct regcache *regcache, int tid, int regno) | |
391 | { | |
392 | char xstateregs[I386_XSTATE_MAX_SIZE]; | |
393 | struct iovec iov; | |
394 | ||
395 | if (!have_ptrace_getregset) | |
396 | return 0; | |
397 | ||
398 | iov.iov_base = xstateregs; | |
399 | iov.iov_len = sizeof(xstateregs); | |
400 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
401 | &iov) < 0) | |
402 | perror_with_name (_("Couldn't read extended state status")); | |
403 | ||
404 | i387_collect_xsave (regcache, regno, xstateregs, 0); | |
405 | ||
406 | if (ptrace (PTRACE_SETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
407 | (int) &iov) < 0) | |
408 | perror_with_name (_("Couldn't write extended state status")); | |
409 | ||
410 | return 1; | |
411 | } | |
412 | ||
6ce2ac0b | 413 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 | 414 | |
6ce2ac0b | 415 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
416 | process/thread TID and store their values in GDB's register array. |
417 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 418 | |
5c44784c | 419 | static int |
56be3814 | 420 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 421 | { |
6ce2ac0b | 422 | elf_fpxregset_t fpxregs; |
5c44784c | 423 | |
6ce2ac0b | 424 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
425 | return 0; |
426 | ||
6ce2ac0b | 427 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 428 | { |
5c44784c JM |
429 | if (errno == EIO) |
430 | { | |
6ce2ac0b | 431 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
432 | return 0; |
433 | } | |
434 | ||
e2e0b3e5 | 435 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
436 | } |
437 | ||
b7a8b4ef | 438 | i387_supply_fxsave (regcache, -1, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
439 | return 1; |
440 | } | |
d4f3574e | 441 | |
04cd15b6 | 442 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 443 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 444 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 445 | |
5c44784c | 446 | static int |
56be3814 | 447 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 448 | { |
6ce2ac0b | 449 | elf_fpxregset_t fpxregs; |
5c44784c | 450 | |
6ce2ac0b | 451 | if (! have_ptrace_getfpxregs) |
5c44784c | 452 | return 0; |
6ce2ac0b MK |
453 | |
454 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
455 | { |
456 | if (errno == EIO) | |
457 | { | |
458 | have_ptrace_getfpxregs = 0; | |
459 | return 0; | |
460 | } | |
461 | ||
e2e0b3e5 | 462 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 463 | } |
5c44784c | 464 | |
b7a8b4ef | 465 | i387_collect_fxsave (regcache, regno, &fpxregs); |
5c44784c | 466 | |
6ce2ac0b | 467 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 468 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
469 | |
470 | return 1; | |
471 | } | |
472 | ||
5c44784c JM |
473 | #else |
474 | ||
1777feb0 MS |
475 | static int |
476 | fetch_fpxregs (struct regcache *regcache, int tid) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static int | |
482 | store_fpxregs (const struct regcache *regcache, int tid, int regno) | |
483 | { | |
484 | return 0; | |
485 | } | |
5c44784c | 486 | |
6ce2ac0b | 487 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 488 | \f |
6ce2ac0b | 489 | |
5c44784c | 490 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 491 | |
04cd15b6 MK |
492 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
493 | this for all registers (including the floating point and SSE | |
494 | registers). */ | |
d4f3574e | 495 | |
10d6c8cd | 496 | static void |
28439f5e PA |
497 | i386_linux_fetch_inferior_registers (struct target_ops *ops, |
498 | struct regcache *regcache, int regno) | |
d4f3574e | 499 | { |
ed9a39eb JM |
500 | int tid; |
501 | ||
f60300e7 MK |
502 | /* Use the old method of peeking around in `struct user' if the |
503 | GETREGS request isn't available. */ | |
ce556f85 | 504 | if (!have_ptrace_getregs) |
f60300e7 | 505 | { |
ce556f85 MK |
506 | int i; |
507 | ||
875f8d0e | 508 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 509 | if (regno == -1 || regno == i) |
56be3814 | 510 | fetch_register (regcache, i); |
ce556f85 | 511 | |
f60300e7 MK |
512 | return; |
513 | } | |
514 | ||
a4b6fc86 | 515 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
516 | tid = TIDGET (inferior_ptid); |
517 | if (tid == 0) | |
518 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 519 | |
6ce2ac0b | 520 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 521 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 522 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 523 | zero. */ |
5c44784c JM |
524 | if (regno == -1) |
525 | { | |
56be3814 | 526 | fetch_regs (regcache, tid); |
f60300e7 MK |
527 | |
528 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 529 | if (!have_ptrace_getregs) |
f60300e7 | 530 | { |
84e473c8 | 531 | i386_linux_fetch_inferior_registers (ops, regcache, regno); |
f60300e7 MK |
532 | return; |
533 | } | |
534 | ||
c131fcee L |
535 | if (fetch_xstateregs (regcache, tid)) |
536 | return; | |
56be3814 | 537 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 538 | return; |
56be3814 | 539 | fetch_fpregs (regcache, tid); |
5c44784c JM |
540 | return; |
541 | } | |
d4f3574e | 542 | |
5c44784c JM |
543 | if (GETREGS_SUPPLIES (regno)) |
544 | { | |
56be3814 | 545 | fetch_regs (regcache, tid); |
5c44784c JM |
546 | return; |
547 | } | |
548 | ||
c131fcee L |
549 | if (GETXSTATEREGS_SUPPLIES (regno)) |
550 | { | |
551 | if (fetch_xstateregs (regcache, tid)) | |
552 | return; | |
553 | } | |
554 | ||
6ce2ac0b | 555 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 556 | { |
56be3814 | 557 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
558 | return; |
559 | ||
560 | /* Either our processor or our kernel doesn't support the SSE | |
561 | registers, so read the FP registers in the traditional way, | |
562 | and fill the SSE registers with dummy values. It would be | |
563 | more graceful to handle differences in the register set using | |
564 | gdbarch. Until then, this will at least make things work | |
565 | plausibly. */ | |
56be3814 | 566 | fetch_fpregs (regcache, tid); |
5c44784c JM |
567 | return; |
568 | } | |
569 | ||
8e65ff28 | 570 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 571 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
572 | } |
573 | ||
04cd15b6 MK |
574 | /* Store register REGNO back into the child process. If REGNO is -1, |
575 | do this for all registers (including the floating point and SSE | |
576 | registers). */ | |
10d6c8cd | 577 | static void |
28439f5e PA |
578 | i386_linux_store_inferior_registers (struct target_ops *ops, |
579 | struct regcache *regcache, int regno) | |
d4f3574e | 580 | { |
ed9a39eb JM |
581 | int tid; |
582 | ||
f60300e7 MK |
583 | /* Use the old method of poking around in `struct user' if the |
584 | SETREGS request isn't available. */ | |
ce556f85 | 585 | if (!have_ptrace_getregs) |
f60300e7 | 586 | { |
ce556f85 MK |
587 | int i; |
588 | ||
875f8d0e | 589 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
ce556f85 | 590 | if (regno == -1 || regno == i) |
56be3814 | 591 | store_register (regcache, i); |
ce556f85 | 592 | |
f60300e7 MK |
593 | return; |
594 | } | |
595 | ||
a4b6fc86 | 596 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
597 | tid = TIDGET (inferior_ptid); |
598 | if (tid == 0) | |
599 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 600 | |
6ce2ac0b | 601 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 602 | transfers more registers in one system call. But remember that |
6ce2ac0b | 603 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
604 | if (regno == -1) |
605 | { | |
56be3814 | 606 | store_regs (regcache, tid, regno); |
c131fcee L |
607 | if (store_xstateregs (regcache, tid, regno)) |
608 | return; | |
56be3814 | 609 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c | 610 | return; |
56be3814 | 611 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
612 | return; |
613 | } | |
d4f3574e | 614 | |
5c44784c JM |
615 | if (GETREGS_SUPPLIES (regno)) |
616 | { | |
56be3814 | 617 | store_regs (regcache, tid, regno); |
5c44784c JM |
618 | return; |
619 | } | |
620 | ||
c131fcee L |
621 | if (GETXSTATEREGS_SUPPLIES (regno)) |
622 | { | |
623 | if (store_xstateregs (regcache, tid, regno)) | |
624 | return; | |
625 | } | |
626 | ||
6ce2ac0b | 627 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 628 | { |
56be3814 | 629 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
630 | return; |
631 | ||
632 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
633 | registers, so just write the FP registers in the traditional |
634 | way. */ | |
56be3814 | 635 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
636 | return; |
637 | } | |
638 | ||
8e65ff28 | 639 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 640 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 641 | } |
de57eccd | 642 | \f |
6ce2ac0b | 643 | |
4ffc8466 MK |
644 | /* Support for debug registers. */ |
645 | ||
a79d3c27 JK |
646 | /* Get debug register REGNUM value from only the one LWP of PTID. */ |
647 | ||
7bf0983e | 648 | static unsigned long |
9f0bdab8 | 649 | i386_linux_dr_get (ptid_t ptid, int regnum) |
84346e11 MK |
650 | { |
651 | int tid; | |
7bf0983e | 652 | unsigned long value; |
84346e11 | 653 | |
9f0bdab8 DJ |
654 | tid = TIDGET (ptid); |
655 | if (tid == 0) | |
656 | tid = PIDGET (ptid); | |
84346e11 MK |
657 | |
658 | errno = 0; | |
ce556f85 | 659 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
660 | offsetof (struct user, u_debugreg[regnum]), 0); |
661 | if (errno != 0) | |
e2e0b3e5 | 662 | perror_with_name (_("Couldn't read debug register")); |
84346e11 MK |
663 | |
664 | return value; | |
665 | } | |
666 | ||
a79d3c27 JK |
667 | /* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ |
668 | ||
84346e11 | 669 | static void |
9f0bdab8 | 670 | i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
84346e11 MK |
671 | { |
672 | int tid; | |
673 | ||
9f0bdab8 DJ |
674 | tid = TIDGET (ptid); |
675 | if (tid == 0) | |
676 | tid = PIDGET (ptid); | |
84346e11 MK |
677 | |
678 | errno = 0; | |
ce556f85 | 679 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
680 | offsetof (struct user, u_debugreg[regnum]), value); |
681 | if (errno != 0) | |
e2e0b3e5 | 682 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
683 | } |
684 | ||
7b50312a | 685 | /* Return the inferior's debug register REGNUM. */ |
a79d3c27 | 686 | |
7b50312a PA |
687 | static CORE_ADDR |
688 | i386_linux_dr_get_addr (int regnum) | |
84346e11 | 689 | { |
7b50312a PA |
690 | /* DR6 and DR7 are retrieved with some other way. */ |
691 | gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); | |
9f0bdab8 | 692 | |
7b50312a | 693 | return i386_linux_dr_get (inferior_ptid, regnum); |
84346e11 MK |
694 | } |
695 | ||
7b50312a | 696 | /* Return the inferior's DR7 debug control register. */ |
a79d3c27 | 697 | |
7b50312a PA |
698 | static unsigned long |
699 | i386_linux_dr_get_control (void) | |
84346e11 | 700 | { |
7b50312a PA |
701 | return i386_linux_dr_get (inferior_ptid, DR_CONTROL); |
702 | } | |
9f0bdab8 | 703 | |
7b50312a | 704 | /* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ |
84346e11 | 705 | |
7b50312a PA |
706 | static unsigned long |
707 | i386_linux_dr_get_status (void) | |
708 | { | |
709 | return i386_linux_dr_get (inferior_ptid, DR_STATUS); | |
84346e11 MK |
710 | } |
711 | ||
7b50312a PA |
712 | /* Callback for iterate_over_lwps. Update the debug registers of |
713 | LWP. */ | |
714 | ||
715 | static int | |
716 | update_debug_registers_callback (struct lwp_info *lwp, void *arg) | |
717 | { | |
6e012a6c PA |
718 | if (lwp->arch_private == NULL) |
719 | lwp->arch_private = XCNEW (struct arch_lwp_info); | |
720 | ||
7b50312a PA |
721 | /* The actual update is done later just before resuming the lwp, we |
722 | just mark that the registers need updating. */ | |
723 | lwp->arch_private->debug_registers_changed = 1; | |
724 | ||
725 | /* If the lwp isn't stopped, force it to momentarily pause, so we | |
726 | can update its debug registers. */ | |
727 | if (!lwp->stopped) | |
728 | linux_stop_lwp (lwp); | |
729 | ||
8da828f7 | 730 | /* Continue the iteration. */ |
7b50312a PA |
731 | return 0; |
732 | } | |
733 | ||
734 | /* Set DR_CONTROL to ADDR in all LWPs of the current inferior. */ | |
a79d3c27 | 735 | |
9bb9e8ad | 736 | static void |
7b50312a | 737 | i386_linux_dr_set_control (unsigned long control) |
84346e11 | 738 | { |
7b50312a PA |
739 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
740 | ||
741 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
84346e11 MK |
742 | } |
743 | ||
7b50312a PA |
744 | /* Set address REGNUM (zero based) to ADDR in all LWPs of the current |
745 | inferior. */ | |
a79d3c27 | 746 | |
7b50312a PA |
747 | static void |
748 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
84346e11 | 749 | { |
7b50312a PA |
750 | ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
751 | ||
752 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
753 | ||
754 | iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); | |
9f0bdab8 DJ |
755 | } |
756 | ||
7b50312a PA |
757 | /* Called when resuming a thread. |
758 | If the debug regs have changed, update the thread's copies. */ | |
a79d3c27 JK |
759 | |
760 | static void | |
7b50312a | 761 | i386_linux_prepare_to_resume (struct lwp_info *lwp) |
a79d3c27 | 762 | { |
7b50312a | 763 | int clear_status = 0; |
a79d3c27 | 764 | |
6e012a6c PA |
765 | /* NULL means this is the main thread still going through the shell, |
766 | or, no watchpoint has been set yet. In that case, there's | |
767 | nothing to do. */ | |
768 | if (lwp->arch_private == NULL) | |
769 | return; | |
770 | ||
7b50312a | 771 | if (lwp->arch_private->debug_registers_changed) |
a79d3c27 | 772 | { |
7b50312a PA |
773 | struct i386_debug_reg_state *state = i386_debug_reg_state (); |
774 | int i; | |
775 | ||
776 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
777 | if (state->dr_ref_count[i] > 0) | |
778 | { | |
779 | i386_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); | |
780 | ||
781 | /* If we're setting a watchpoint, any change the inferior | |
782 | had done itself to the debug registers needs to be | |
783 | discarded, otherwise, i386_stopped_data_address can get | |
784 | confused. */ | |
785 | clear_status = 1; | |
786 | } | |
4c38200f | 787 | |
7b50312a PA |
788 | i386_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); |
789 | ||
790 | lwp->arch_private->debug_registers_changed = 0; | |
a79d3c27 | 791 | } |
7b50312a PA |
792 | |
793 | if (clear_status || lwp->stopped_by_watchpoint) | |
794 | i386_linux_dr_set (lwp->ptid, DR_STATUS, 0); | |
a79d3c27 JK |
795 | } |
796 | ||
9f0bdab8 | 797 | static void |
7b50312a | 798 | i386_linux_new_thread (struct lwp_info *lp) |
9f0bdab8 | 799 | { |
7b50312a | 800 | struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); |
9f0bdab8 | 801 | |
7b50312a | 802 | info->debug_registers_changed = 1; |
9f0bdab8 | 803 | |
7b50312a | 804 | lp->arch_private = info; |
84346e11 MK |
805 | } |
806 | \f | |
807 | ||
5bca7895 MK |
808 | /* Called by libthread_db. Returns a pointer to the thread local |
809 | storage (or its descriptor). */ | |
810 | ||
811 | ps_err_e | |
812 | ps_get_thread_area (const struct ps_prochandle *ph, | |
813 | lwpid_t lwpid, int idx, void **base) | |
814 | { | |
815 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
816 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
817 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
818 | and a bunch of status bits. | |
819 | ||
820 | The values returned by this ptrace call should be part of the | |
821 | regcache buffer, and ps_get_thread_area should channel its | |
822 | request through the regcache. That way remote targets could | |
823 | provide the value using the remote protocol and not this direct | |
824 | call. | |
825 | ||
826 | Is this function needed? I'm guessing that the `base' is the | |
766062f6 | 827 | address of a descriptor that libthread_db uses to find the |
b2fa5097 | 828 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
829 | descriptor is defined by the ABI. Anyway, given that |
830 | libthread_db calls this function without prompting (gdb | |
831 | requesting tls base) I guess it needs info in there anyway. */ | |
832 | unsigned int desc[4]; | |
833 | gdb_assert (sizeof (int) == 4); | |
834 | ||
835 | #ifndef PTRACE_GET_THREAD_AREA | |
836 | #define PTRACE_GET_THREAD_AREA 25 | |
837 | #endif | |
838 | ||
839 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
840 | (void *) idx, (unsigned long) &desc) < 0) | |
841 | return PS_ERR; | |
842 | ||
843 | *(int *)base = desc[1]; | |
844 | return PS_OK; | |
845 | } | |
846 | \f | |
847 | ||
a4b6fc86 | 848 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
849 | int $0x80 |
850 | or 0xcd 0x80. */ | |
851 | ||
852 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
853 | ||
854 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
855 | ||
856 | /* The system call number is stored in the %eax register. */ | |
7532965f | 857 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
858 | |
859 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
860 | system calls. */ | |
861 | ||
862 | #ifndef SYS_sigreturn | |
863 | #define SYS_sigreturn 0x77 | |
864 | #endif | |
865 | #ifndef SYS_rt_sigreturn | |
866 | #define SYS_rt_sigreturn 0xad | |
867 | #endif | |
868 | ||
869 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
870 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
871 | ||
872 | /* Resume execution of the inferior process. | |
873 | If STEP is nonzero, single-step it. | |
874 | If SIGNAL is nonzero, give it that signal. */ | |
875 | ||
10d6c8cd | 876 | static void |
28439f5e PA |
877 | i386_linux_resume (struct target_ops *ops, |
878 | ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 879 | { |
39f77062 KB |
880 | int pid = PIDGET (ptid); |
881 | ||
a96d9b2e SDJ |
882 | int request; |
883 | ||
884 | if (catch_syscall_enabled () > 0) | |
885 | request = PTRACE_SYSCALL; | |
886 | else | |
887 | request = PTRACE_CONT; | |
a6abb2c0 | 888 | |
a6abb2c0 MK |
889 | if (step) |
890 | { | |
594f7785 | 891 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
e17a4113 UW |
892 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
893 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
7b86a1b8 | 894 | ULONGEST pc; |
8e70166d | 895 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
896 | |
897 | request = PTRACE_SINGLESTEP; | |
898 | ||
e17a4113 UW |
899 | regcache_cooked_read_unsigned (regcache, |
900 | gdbarch_pc_regnum (gdbarch), &pc); | |
7b86a1b8 | 901 | |
a6abb2c0 MK |
902 | /* Returning from a signal trampoline is done by calling a |
903 | special system call (sigreturn or rt_sigreturn, see | |
904 | i386-linux-tdep.c for more information). This system call | |
905 | restores the registers that were saved when the signal was | |
906 | raised, including %eflags. That means that single-stepping | |
907 | won't work. Instead, we'll have to modify the signal context | |
908 | that's about to be restored, and set the trace flag there. */ | |
909 | ||
910 | /* First check if PC is at a system call. */ | |
8defab1a | 911 | if (target_read_memory (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
912 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
913 | { | |
7b86a1b8 UW |
914 | ULONGEST syscall; |
915 | regcache_cooked_read_unsigned (regcache, | |
916 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
917 | |
918 | /* Then check the system call number. */ | |
919 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
920 | { | |
7b86a1b8 | 921 | ULONGEST sp, addr; |
a6abb2c0 | 922 | unsigned long int eflags; |
7bf0983e | 923 | |
7b86a1b8 | 924 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 | 925 | if (syscall == SYS_rt_sigreturn) |
f3d6df6d YQ |
926 | addr = read_memory_unsigned_integer (sp + 8, 4, byte_order) |
927 | + 20; | |
7b86a1b8 UW |
928 | else |
929 | addr = sp; | |
a6abb2c0 MK |
930 | |
931 | /* Set the trace flag in the context that's about to be | |
932 | restored. */ | |
933 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 934 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 935 | eflags |= 0x0100; |
8e70166d | 936 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
937 | } |
938 | } | |
939 | } | |
940 | ||
941 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 942 | perror_with_name (("ptrace")); |
a6abb2c0 | 943 | } |
4de4c07c | 944 | |
10d6c8cd DJ |
945 | static void (*super_post_startup_inferior) (ptid_t ptid); |
946 | ||
947 | static void | |
948 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
949 | { |
950 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
951 | super_post_startup_inferior (ptid); |
952 | } | |
953 | ||
90884b2b L |
954 | /* Get Linux/x86 target description from running target. */ |
955 | ||
956 | static const struct target_desc * | |
957 | i386_linux_read_description (struct target_ops *ops) | |
958 | { | |
3a13a53b | 959 | int tid; |
c131fcee L |
960 | static uint64_t xcr0; |
961 | ||
3a13a53b L |
962 | /* GNU/Linux LWP ID's are process ID's. */ |
963 | tid = TIDGET (inferior_ptid); | |
964 | if (tid == 0) | |
965 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
966 | ||
967 | #ifdef HAVE_PTRACE_GETFPXREGS | |
968 | if (have_ptrace_getfpxregs == -1) | |
969 | { | |
970 | elf_fpxregset_t fpxregs; | |
971 | ||
972 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) | |
973 | { | |
974 | have_ptrace_getfpxregs = 0; | |
975 | have_ptrace_getregset = 0; | |
976 | return tdesc_i386_mmx_linux; | |
977 | } | |
978 | } | |
979 | #endif | |
980 | ||
c131fcee L |
981 | if (have_ptrace_getregset == -1) |
982 | { | |
c131fcee L |
983 | uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; |
984 | struct iovec iov; | |
985 | ||
c131fcee L |
986 | iov.iov_base = xstateregs; |
987 | iov.iov_len = sizeof (xstateregs); | |
988 | ||
989 | /* Check if PTRACE_GETREGSET works. */ | |
990 | if (ptrace (PTRACE_GETREGSET, tid, (unsigned int) NT_X86_XSTATE, | |
991 | &iov) < 0) | |
992 | have_ptrace_getregset = 0; | |
993 | else | |
994 | { | |
995 | have_ptrace_getregset = 1; | |
996 | ||
997 | /* Get XCR0 from XSAVE extended state. */ | |
998 | xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET | |
999 | / sizeof (long long))]; | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* Check the native XCR0 only if PTRACE_GETREGSET is available. */ | |
1004 | if (have_ptrace_getregset | |
1005 | && (xcr0 & I386_XSTATE_AVX_MASK) == I386_XSTATE_AVX_MASK) | |
1006 | return tdesc_i386_avx_linux; | |
1007 | else | |
1008 | return tdesc_i386_linux; | |
90884b2b L |
1009 | } |
1010 | ||
10d6c8cd DJ |
1011 | void |
1012 | _initialize_i386_linux_nat (void) | |
1013 | { | |
1014 | struct target_ops *t; | |
1015 | ||
1016 | /* Fill in the generic GNU/Linux methods. */ | |
1017 | t = linux_target (); | |
1018 | ||
c03374d5 DJ |
1019 | i386_use_watchpoints (t); |
1020 | ||
9bb9e8ad PM |
1021 | i386_dr_low.set_control = i386_linux_dr_set_control; |
1022 | i386_dr_low.set_addr = i386_linux_dr_set_addr; | |
7b50312a | 1023 | i386_dr_low.get_addr = i386_linux_dr_get_addr; |
9bb9e8ad | 1024 | i386_dr_low.get_status = i386_linux_dr_get_status; |
7b50312a | 1025 | i386_dr_low.get_control = i386_linux_dr_get_control; |
9bb9e8ad PM |
1026 | i386_set_debug_register_length (4); |
1027 | ||
10d6c8cd DJ |
1028 | /* Override the default ptrace resume method. */ |
1029 | t->to_resume = i386_linux_resume; | |
1030 | ||
1031 | /* Override the GNU/Linux inferior startup hook. */ | |
1032 | super_post_startup_inferior = t->to_post_startup_inferior; | |
1033 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
1034 | ||
1035 | /* Add our register access methods. */ | |
1036 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
1037 | t->to_store_registers = i386_linux_store_inferior_registers; | |
1038 | ||
90884b2b L |
1039 | t->to_read_description = i386_linux_read_description; |
1040 | ||
10d6c8cd | 1041 | /* Register the target. */ |
f973ed9c | 1042 | linux_nat_add_target (t); |
9f0bdab8 | 1043 | linux_nat_set_new_thread (t, i386_linux_new_thread); |
7b50312a | 1044 | linux_nat_set_prepare_to_resume (t, i386_linux_prepare_to_resume); |
4de4c07c | 1045 | } |