Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
6aba47ca | 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
31828840 | 4 | 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" | |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
4e052eda | 24 | #include "regcache.h" |
10d6c8cd | 25 | #include "target.h" |
4de4c07c | 26 | #include "linux-nat.h" |
d4f3574e | 27 | |
84346e11 | 28 | #include "gdb_assert.h" |
309367d4 | 29 | #include "gdb_string.h" |
d4f3574e SS |
30 | #include <sys/ptrace.h> |
31 | #include <sys/user.h> | |
32 | #include <sys/procfs.h> | |
33 | ||
34 | #ifdef HAVE_SYS_REG_H | |
35 | #include <sys/reg.h> | |
36 | #endif | |
37 | ||
ce556f85 MK |
38 | #ifndef ORIG_EAX |
39 | #define ORIG_EAX -1 | |
40 | #endif | |
41 | ||
84346e11 MK |
42 | #ifdef HAVE_SYS_DEBUGREG_H |
43 | #include <sys/debugreg.h> | |
44 | #endif | |
45 | ||
46 | #ifndef DR_FIRSTADDR | |
47 | #define DR_FIRSTADDR 0 | |
48 | #endif | |
49 | ||
50 | #ifndef DR_LASTADDR | |
51 | #define DR_LASTADDR 3 | |
52 | #endif | |
53 | ||
54 | #ifndef DR_STATUS | |
55 | #define DR_STATUS 6 | |
56 | #endif | |
57 | ||
58 | #ifndef DR_CONTROL | |
59 | #define DR_CONTROL 7 | |
60 | #endif | |
61 | ||
6ce2ac0b | 62 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
63 | #include "gregset.h" |
64 | ||
e750d25e | 65 | #include "i387-tdep.h" |
c3833324 | 66 | #include "i386-tdep.h" |
5179e78f AC |
67 | #include "i386-linux-tdep.h" |
68 | ||
b757528f JJ |
69 | /* Defines ps_err_e, struct ps_prochandle. */ |
70 | #include "gdb_proc_service.h" | |
6ce2ac0b | 71 | \f |
d4f3574e | 72 | |
a4b6fc86 AC |
73 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
74 | the register sets in `struct user' that is used for a.out | |
75 | core-dumps, and is also used by `ptrace'. The corresponding types | |
76 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
77 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
78 | for the floating-point registers. | |
79 | ||
80 | Those types used to be available under the names `gregset_t' and | |
81 | `fpregset_t' too, and this file used those names in the past. But | |
82 | those names are now used for the register sets used in the | |
83 | `mcontext_t' type, and have a different size and layout. */ | |
84 | ||
85 | /* Mapping between the general-purpose registers in `struct user' | |
86 | format and GDB's register array layout. */ | |
d4f3574e SS |
87 | static int regmap[] = |
88 | { | |
89 | EAX, ECX, EDX, EBX, | |
90 | UESP, EBP, ESI, EDI, | |
91 | EIP, EFL, CS, SS, | |
ce556f85 MK |
92 | DS, ES, FS, GS, |
93 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
94 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
95 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
96 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
97 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
98 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
99 | -1, /* mxcsr */ | |
100 | ORIG_EAX | |
d4f3574e SS |
101 | }; |
102 | ||
5c44784c JM |
103 | /* Which ptrace request retrieves which registers? |
104 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 105 | |
5c44784c | 106 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 107 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 108 | |
6ce2ac0b | 109 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 110 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 111 | |
f60300e7 MK |
112 | /* Does the current host support the GETREGS request? */ |
113 | int have_ptrace_getregs = | |
114 | #ifdef HAVE_PTRACE_GETREGS | |
115 | 1 | |
116 | #else | |
117 | 0 | |
118 | #endif | |
119 | ; | |
120 | ||
6ce2ac0b | 121 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
122 | file may or may not define it, and even if it is defined, the |
123 | kernel will return EIO if it's running on a pre-SSE processor. | |
124 | ||
125 | My instinct is to attach this to some architecture- or | |
126 | target-specific data structure, but really, a particular GDB | |
127 | process can only run on top of one kernel at a time. So it's okay | |
128 | for this to be a simple variable. */ | |
6ce2ac0b MK |
129 | int have_ptrace_getfpxregs = |
130 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
131 | 1 |
132 | #else | |
133 | 0 | |
134 | #endif | |
135 | ; | |
f60300e7 | 136 | \f |
6ce2ac0b | 137 | |
ce556f85 | 138 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
139 | |
140 | /* Fetch one register. */ | |
141 | ||
142 | static void | |
56be3814 | 143 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 144 | { |
f60300e7 | 145 | int tid; |
ce556f85 | 146 | int val; |
f60300e7 | 147 | |
ce556f85 | 148 | gdb_assert (!have_ptrace_getregs); |
de732108 | 149 | if (regmap[regno] == -1) |
f60300e7 | 150 | { |
56be3814 | 151 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
152 | return; |
153 | } | |
154 | ||
ce556f85 | 155 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
156 | tid = TIDGET (inferior_ptid); |
157 | if (tid == 0) | |
158 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 159 | |
ce556f85 | 160 | errno = 0; |
de732108 | 161 | val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0); |
ce556f85 | 162 | if (errno != 0) |
c9f4d572 UW |
163 | error (_("Couldn't read register %s (#%d): %s."), |
164 | gdbarch_register_name (current_gdbarch, regno), | |
ce556f85 | 165 | regno, safe_strerror (errno)); |
f60300e7 | 166 | |
56be3814 | 167 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
168 | } |
169 | ||
f60300e7 MK |
170 | /* Store one register. */ |
171 | ||
172 | static void | |
56be3814 | 173 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 174 | { |
f60300e7 | 175 | int tid; |
ce556f85 | 176 | int val; |
f60300e7 | 177 | |
ce556f85 | 178 | gdb_assert (!have_ptrace_getregs); |
de732108 | 179 | if (regmap[regno] == -1) |
ce556f85 | 180 | return; |
f60300e7 | 181 | |
ce556f85 | 182 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
183 | tid = TIDGET (inferior_ptid); |
184 | if (tid == 0) | |
185 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 186 | |
ce556f85 | 187 | errno = 0; |
56be3814 | 188 | regcache_raw_collect (regcache, regno, &val); |
de732108 | 189 | ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val); |
ce556f85 | 190 | if (errno != 0) |
c9f4d572 UW |
191 | error (_("Couldn't write register %s (#%d): %s."), |
192 | gdbarch_register_name (current_gdbarch, regno), | |
ce556f85 | 193 | regno, safe_strerror (errno)); |
f60300e7 | 194 | } |
5c44784c | 195 | \f |
6ce2ac0b | 196 | |
04cd15b6 MK |
197 | /* Transfering the general-purpose registers between GDB, inferiors |
198 | and core files. */ | |
199 | ||
ad2a4d09 | 200 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 201 | in *GREGSETP. */ |
5c44784c | 202 | |
d4f3574e | 203 | void |
7f7fe91e | 204 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 205 | { |
7f7fe91e | 206 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
6ce2ac0b | 207 | int i; |
d4f3574e | 208 | |
98df6387 | 209 | for (i = 0; i < I386_NUM_GREGS; i++) |
7f7fe91e | 210 | regcache_raw_supply (regcache, i, regp + regmap[i]); |
3fb1c838 | 211 | |
f57d151a | 212 | if (I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch)) |
7f7fe91e | 213 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 214 | regp + ORIG_EAX); |
917317f4 JM |
215 | } |
216 | ||
04cd15b6 MK |
217 | /* Fill register REGNO (if it is a general-purpose register) in |
218 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
219 | do this for all registers. */ | |
6ce2ac0b | 220 | |
917317f4 | 221 | void |
7f7fe91e UW |
222 | fill_gregset (const struct regcache *regcache, |
223 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 224 | { |
6ce2ac0b MK |
225 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
226 | int i; | |
04cd15b6 | 227 | |
98df6387 | 228 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 229 | if (regno == -1 || regno == i) |
7f7fe91e | 230 | regcache_raw_collect (regcache, i, regp + regmap[i]); |
3fb1c838 | 231 | |
82ea117a | 232 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
f57d151a | 233 | && I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch)) |
7f7fe91e | 234 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 235 | regp + ORIG_EAX); |
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 | ||
56be3814 UW |
347 | static void fetch_fpregs (struct regcache *regcache, int tid) {} |
348 | static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
349 | |
350 | #endif | |
5c44784c | 351 | \f |
d4f3574e | 352 | |
6ce2ac0b | 353 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 354 | |
6ce2ac0b | 355 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
356 | |
357 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 358 | values in *FPXREGSETP. */ |
04cd15b6 | 359 | |
975aec09 | 360 | void |
7f7fe91e UW |
361 | supply_fpxregset (struct regcache *regcache, |
362 | const elf_fpxregset_t *fpxregsetp) | |
d4f3574e | 363 | { |
7f7fe91e | 364 | i387_supply_fxsave (regcache, -1, fpxregsetp); |
d4f3574e SS |
365 | } |
366 | ||
6ce2ac0b MK |
367 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
368 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
369 | -1, do this for all registers. */ | |
d4f3574e | 370 | |
975aec09 | 371 | void |
7f7fe91e UW |
372 | fill_fpxregset (const struct regcache *regcache, |
373 | elf_fpxregset_t *fpxregsetp, int regno) | |
d4f3574e | 374 | { |
7f7fe91e | 375 | i387_collect_fxsave (regcache, regno, fpxregsetp); |
5c44784c JM |
376 | } |
377 | ||
6ce2ac0b | 378 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
379 | process/thread TID and store their values in GDB's register array. |
380 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 381 | |
5c44784c | 382 | static int |
56be3814 | 383 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 384 | { |
6ce2ac0b | 385 | elf_fpxregset_t fpxregs; |
5c44784c | 386 | |
6ce2ac0b | 387 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
388 | return 0; |
389 | ||
6ce2ac0b | 390 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 391 | { |
5c44784c JM |
392 | if (errno == EIO) |
393 | { | |
6ce2ac0b | 394 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
395 | return 0; |
396 | } | |
397 | ||
e2e0b3e5 | 398 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
399 | } |
400 | ||
56be3814 | 401 | supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
402 | return 1; |
403 | } | |
d4f3574e | 404 | |
04cd15b6 | 405 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 406 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 407 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 408 | |
5c44784c | 409 | static int |
56be3814 | 410 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 411 | { |
6ce2ac0b | 412 | elf_fpxregset_t fpxregs; |
5c44784c | 413 | |
6ce2ac0b | 414 | if (! have_ptrace_getfpxregs) |
5c44784c | 415 | return 0; |
6ce2ac0b MK |
416 | |
417 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
418 | { |
419 | if (errno == EIO) | |
420 | { | |
421 | have_ptrace_getfpxregs = 0; | |
422 | return 0; | |
423 | } | |
424 | ||
e2e0b3e5 | 425 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 426 | } |
5c44784c | 427 | |
56be3814 | 428 | fill_fpxregset (regcache, &fpxregs, regno); |
5c44784c | 429 | |
6ce2ac0b | 430 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 431 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
432 | |
433 | return 1; | |
434 | } | |
435 | ||
5c44784c JM |
436 | #else |
437 | ||
56be3814 UW |
438 | static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } |
439 | static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } | |
5c44784c | 440 | |
6ce2ac0b | 441 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 442 | \f |
6ce2ac0b | 443 | |
5c44784c | 444 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 445 | |
04cd15b6 MK |
446 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
447 | this for all registers (including the floating point and SSE | |
448 | registers). */ | |
d4f3574e | 449 | |
10d6c8cd | 450 | static void |
56be3814 | 451 | i386_linux_fetch_inferior_registers (struct regcache *regcache, int regno) |
d4f3574e | 452 | { |
ed9a39eb JM |
453 | int tid; |
454 | ||
f60300e7 MK |
455 | /* Use the old method of peeking around in `struct user' if the |
456 | GETREGS request isn't available. */ | |
ce556f85 | 457 | if (!have_ptrace_getregs) |
f60300e7 | 458 | { |
ce556f85 MK |
459 | int i; |
460 | ||
f57d151a | 461 | for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++) |
ce556f85 | 462 | if (regno == -1 || regno == i) |
56be3814 | 463 | fetch_register (regcache, i); |
ce556f85 | 464 | |
f60300e7 MK |
465 | return; |
466 | } | |
467 | ||
a4b6fc86 | 468 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
469 | tid = TIDGET (inferior_ptid); |
470 | if (tid == 0) | |
471 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 472 | |
6ce2ac0b | 473 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 474 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 475 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 476 | zero. */ |
5c44784c JM |
477 | if (regno == -1) |
478 | { | |
56be3814 | 479 | fetch_regs (regcache, tid); |
f60300e7 MK |
480 | |
481 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 482 | if (!have_ptrace_getregs) |
f60300e7 | 483 | { |
56be3814 | 484 | i386_linux_fetch_inferior_registers (regcache, regno); |
f60300e7 MK |
485 | return; |
486 | } | |
487 | ||
56be3814 | 488 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 489 | return; |
56be3814 | 490 | fetch_fpregs (regcache, tid); |
5c44784c JM |
491 | return; |
492 | } | |
d4f3574e | 493 | |
5c44784c JM |
494 | if (GETREGS_SUPPLIES (regno)) |
495 | { | |
56be3814 | 496 | fetch_regs (regcache, tid); |
5c44784c JM |
497 | return; |
498 | } | |
499 | ||
6ce2ac0b | 500 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 501 | { |
56be3814 | 502 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
503 | return; |
504 | ||
505 | /* Either our processor or our kernel doesn't support the SSE | |
506 | registers, so read the FP registers in the traditional way, | |
507 | and fill the SSE registers with dummy values. It would be | |
508 | more graceful to handle differences in the register set using | |
509 | gdbarch. Until then, this will at least make things work | |
510 | plausibly. */ | |
56be3814 | 511 | fetch_fpregs (regcache, tid); |
5c44784c JM |
512 | return; |
513 | } | |
514 | ||
8e65ff28 | 515 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 516 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
517 | } |
518 | ||
04cd15b6 MK |
519 | /* Store register REGNO back into the child process. If REGNO is -1, |
520 | do this for all registers (including the floating point and SSE | |
521 | registers). */ | |
10d6c8cd | 522 | static void |
56be3814 | 523 | i386_linux_store_inferior_registers (struct regcache *regcache, int regno) |
d4f3574e | 524 | { |
ed9a39eb JM |
525 | int tid; |
526 | ||
f60300e7 MK |
527 | /* Use the old method of poking around in `struct user' if the |
528 | SETREGS request isn't available. */ | |
ce556f85 | 529 | if (!have_ptrace_getregs) |
f60300e7 | 530 | { |
ce556f85 MK |
531 | int i; |
532 | ||
f57d151a | 533 | for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++) |
ce556f85 | 534 | if (regno == -1 || regno == i) |
56be3814 | 535 | store_register (regcache, i); |
ce556f85 | 536 | |
f60300e7 MK |
537 | return; |
538 | } | |
539 | ||
a4b6fc86 | 540 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
541 | tid = TIDGET (inferior_ptid); |
542 | if (tid == 0) | |
543 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 544 | |
6ce2ac0b | 545 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 546 | transfers more registers in one system call. But remember that |
6ce2ac0b | 547 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
548 | if (regno == -1) |
549 | { | |
56be3814 UW |
550 | store_regs (regcache, tid, regno); |
551 | if (store_fpxregs (regcache, tid, regno)) | |
5c44784c | 552 | return; |
56be3814 | 553 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
554 | return; |
555 | } | |
d4f3574e | 556 | |
5c44784c JM |
557 | if (GETREGS_SUPPLIES (regno)) |
558 | { | |
56be3814 | 559 | store_regs (regcache, tid, regno); |
5c44784c JM |
560 | return; |
561 | } | |
562 | ||
6ce2ac0b | 563 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 564 | { |
56be3814 | 565 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
566 | return; |
567 | ||
568 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
569 | registers, so just write the FP registers in the traditional |
570 | way. */ | |
56be3814 | 571 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
572 | return; |
573 | } | |
574 | ||
8e65ff28 | 575 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 576 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 577 | } |
de57eccd | 578 | \f |
6ce2ac0b | 579 | |
4ffc8466 MK |
580 | /* Support for debug registers. */ |
581 | ||
9f0bdab8 DJ |
582 | static unsigned long i386_linux_dr[DR_CONTROL + 1]; |
583 | ||
7bf0983e | 584 | static unsigned long |
9f0bdab8 | 585 | i386_linux_dr_get (ptid_t ptid, int regnum) |
84346e11 MK |
586 | { |
587 | int tid; | |
7bf0983e | 588 | unsigned long value; |
84346e11 | 589 | |
9f0bdab8 DJ |
590 | tid = TIDGET (ptid); |
591 | if (tid == 0) | |
592 | tid = PIDGET (ptid); | |
84346e11 | 593 | |
b9511b9a MK |
594 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
595 | ptrace call fails breaks debugging remote targets. The correct | |
596 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 597 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 598 | ptrace call fails. */ |
84346e11 | 599 | errno = 0; |
ce556f85 | 600 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
601 | offsetof (struct user, u_debugreg[regnum]), 0); |
602 | if (errno != 0) | |
b9511b9a | 603 | #if 0 |
e2e0b3e5 | 604 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
605 | #else |
606 | return 0; | |
607 | #endif | |
84346e11 MK |
608 | |
609 | return value; | |
610 | } | |
611 | ||
612 | static void | |
9f0bdab8 | 613 | i386_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) |
84346e11 MK |
614 | { |
615 | int tid; | |
616 | ||
9f0bdab8 DJ |
617 | tid = TIDGET (ptid); |
618 | if (tid == 0) | |
619 | tid = PIDGET (ptid); | |
84346e11 MK |
620 | |
621 | errno = 0; | |
ce556f85 | 622 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
623 | offsetof (struct user, u_debugreg[regnum]), value); |
624 | if (errno != 0) | |
e2e0b3e5 | 625 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
626 | } |
627 | ||
628 | void | |
7bf0983e | 629 | i386_linux_dr_set_control (unsigned long control) |
84346e11 | 630 | { |
9f0bdab8 DJ |
631 | struct lwp_info *lp; |
632 | ptid_t ptid; | |
633 | ||
634 | i386_linux_dr[DR_CONTROL] = control; | |
635 | ALL_LWPS (lp, ptid) | |
636 | i386_linux_dr_set (ptid, DR_CONTROL, control); | |
84346e11 MK |
637 | } |
638 | ||
639 | void | |
640 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
641 | { | |
9f0bdab8 DJ |
642 | struct lwp_info *lp; |
643 | ptid_t ptid; | |
644 | ||
84346e11 MK |
645 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
646 | ||
9f0bdab8 DJ |
647 | i386_linux_dr[DR_FIRSTADDR + regnum] = addr; |
648 | ALL_LWPS (lp, ptid) | |
649 | i386_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr); | |
84346e11 MK |
650 | } |
651 | ||
652 | void | |
653 | i386_linux_dr_reset_addr (int regnum) | |
654 | { | |
9f0bdab8 | 655 | i386_linux_dr_set_addr (regnum, 0); |
84346e11 MK |
656 | } |
657 | ||
7bf0983e | 658 | unsigned long |
84346e11 MK |
659 | i386_linux_dr_get_status (void) |
660 | { | |
9f0bdab8 DJ |
661 | return i386_linux_dr_get (inferior_ptid, DR_STATUS); |
662 | } | |
663 | ||
664 | static void | |
665 | i386_linux_new_thread (ptid_t ptid) | |
666 | { | |
667 | int i; | |
668 | ||
669 | for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) | |
670 | i386_linux_dr_set (ptid, i, i386_linux_dr[i]); | |
671 | ||
672 | i386_linux_dr_set (ptid, DR_CONTROL, i386_linux_dr[DR_CONTROL]); | |
84346e11 MK |
673 | } |
674 | \f | |
675 | ||
5bca7895 MK |
676 | /* Called by libthread_db. Returns a pointer to the thread local |
677 | storage (or its descriptor). */ | |
678 | ||
679 | ps_err_e | |
680 | ps_get_thread_area (const struct ps_prochandle *ph, | |
681 | lwpid_t lwpid, int idx, void **base) | |
682 | { | |
683 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
684 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
685 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
686 | and a bunch of status bits. | |
687 | ||
688 | The values returned by this ptrace call should be part of the | |
689 | regcache buffer, and ps_get_thread_area should channel its | |
690 | request through the regcache. That way remote targets could | |
691 | provide the value using the remote protocol and not this direct | |
692 | call. | |
693 | ||
694 | Is this function needed? I'm guessing that the `base' is the | |
695 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 696 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
697 | descriptor is defined by the ABI. Anyway, given that |
698 | libthread_db calls this function without prompting (gdb | |
699 | requesting tls base) I guess it needs info in there anyway. */ | |
700 | unsigned int desc[4]; | |
701 | gdb_assert (sizeof (int) == 4); | |
702 | ||
703 | #ifndef PTRACE_GET_THREAD_AREA | |
704 | #define PTRACE_GET_THREAD_AREA 25 | |
705 | #endif | |
706 | ||
707 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
708 | (void *) idx, (unsigned long) &desc) < 0) | |
709 | return PS_ERR; | |
710 | ||
711 | *(int *)base = desc[1]; | |
712 | return PS_OK; | |
713 | } | |
714 | \f | |
715 | ||
a4b6fc86 | 716 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
717 | int $0x80 |
718 | or 0xcd 0x80. */ | |
719 | ||
720 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
721 | ||
722 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
723 | ||
724 | /* The system call number is stored in the %eax register. */ | |
7532965f | 725 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
726 | |
727 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
728 | system calls. */ | |
729 | ||
730 | #ifndef SYS_sigreturn | |
731 | #define SYS_sigreturn 0x77 | |
732 | #endif | |
733 | #ifndef SYS_rt_sigreturn | |
734 | #define SYS_rt_sigreturn 0xad | |
735 | #endif | |
736 | ||
737 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
738 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
739 | ||
740 | /* Resume execution of the inferior process. | |
741 | If STEP is nonzero, single-step it. | |
742 | If SIGNAL is nonzero, give it that signal. */ | |
743 | ||
10d6c8cd DJ |
744 | static void |
745 | i386_linux_resume (ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 746 | { |
39f77062 KB |
747 | int pid = PIDGET (ptid); |
748 | ||
a6abb2c0 MK |
749 | int request = PTRACE_CONT; |
750 | ||
a6abb2c0 MK |
751 | if (step) |
752 | { | |
594f7785 | 753 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
7b86a1b8 | 754 | ULONGEST pc; |
8e70166d | 755 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
756 | |
757 | request = PTRACE_SINGLESTEP; | |
758 | ||
3e8c568d UW |
759 | regcache_cooked_read_unsigned (regcache, |
760 | gdbarch_pc_regnum (current_gdbarch), &pc); | |
7b86a1b8 | 761 | |
a6abb2c0 MK |
762 | /* Returning from a signal trampoline is done by calling a |
763 | special system call (sigreturn or rt_sigreturn, see | |
764 | i386-linux-tdep.c for more information). This system call | |
765 | restores the registers that were saved when the signal was | |
766 | raised, including %eflags. That means that single-stepping | |
767 | won't work. Instead, we'll have to modify the signal context | |
768 | that's about to be restored, and set the trace flag there. */ | |
769 | ||
770 | /* First check if PC is at a system call. */ | |
359a9262 | 771 | if (read_memory_nobpt (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
772 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
773 | { | |
7b86a1b8 UW |
774 | ULONGEST syscall; |
775 | regcache_cooked_read_unsigned (regcache, | |
776 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
777 | |
778 | /* Then check the system call number. */ | |
779 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
780 | { | |
7b86a1b8 | 781 | ULONGEST sp, addr; |
a6abb2c0 | 782 | unsigned long int eflags; |
7bf0983e | 783 | |
7b86a1b8 | 784 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 MK |
785 | if (syscall == SYS_rt_sigreturn) |
786 | addr = read_memory_integer (sp + 8, 4) + 20; | |
7b86a1b8 UW |
787 | else |
788 | addr = sp; | |
a6abb2c0 MK |
789 | |
790 | /* Set the trace flag in the context that's about to be | |
791 | restored. */ | |
792 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 793 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 794 | eflags |= 0x0100; |
8e70166d | 795 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
796 | } |
797 | } | |
798 | } | |
799 | ||
800 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 801 | perror_with_name (("ptrace")); |
a6abb2c0 | 802 | } |
4de4c07c | 803 | |
10d6c8cd DJ |
804 | static void (*super_post_startup_inferior) (ptid_t ptid); |
805 | ||
806 | static void | |
807 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
808 | { |
809 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
810 | super_post_startup_inferior (ptid); |
811 | } | |
812 | ||
813 | void | |
814 | _initialize_i386_linux_nat (void) | |
815 | { | |
816 | struct target_ops *t; | |
817 | ||
818 | /* Fill in the generic GNU/Linux methods. */ | |
819 | t = linux_target (); | |
820 | ||
821 | /* Override the default ptrace resume method. */ | |
822 | t->to_resume = i386_linux_resume; | |
823 | ||
824 | /* Override the GNU/Linux inferior startup hook. */ | |
825 | super_post_startup_inferior = t->to_post_startup_inferior; | |
826 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
827 | ||
828 | /* Add our register access methods. */ | |
829 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
830 | t->to_store_registers = i386_linux_store_inferior_registers; | |
831 | ||
832 | /* Register the target. */ | |
f973ed9c | 833 | linux_nat_add_target (t); |
9f0bdab8 | 834 | linux_nat_set_new_thread (t, i386_linux_new_thread); |
4de4c07c | 835 | } |