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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 MK |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
d4f3574e SS |
22 | |
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "gdbcore.h" | |
4e052eda | 26 | #include "regcache.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" |
d4f3574e SS |
32 | #include <sys/ptrace.h> |
33 | #include <sys/user.h> | |
34 | #include <sys/procfs.h> | |
35 | ||
36 | #ifdef HAVE_SYS_REG_H | |
37 | #include <sys/reg.h> | |
38 | #endif | |
39 | ||
ce556f85 MK |
40 | #ifndef ORIG_EAX |
41 | #define ORIG_EAX -1 | |
42 | #endif | |
43 | ||
84346e11 MK |
44 | #ifdef HAVE_SYS_DEBUGREG_H |
45 | #include <sys/debugreg.h> | |
46 | #endif | |
47 | ||
48 | #ifndef DR_FIRSTADDR | |
49 | #define DR_FIRSTADDR 0 | |
50 | #endif | |
51 | ||
52 | #ifndef DR_LASTADDR | |
53 | #define DR_LASTADDR 3 | |
54 | #endif | |
55 | ||
56 | #ifndef DR_STATUS | |
57 | #define DR_STATUS 6 | |
58 | #endif | |
59 | ||
60 | #ifndef DR_CONTROL | |
61 | #define DR_CONTROL 7 | |
62 | #endif | |
63 | ||
6ce2ac0b | 64 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
65 | #include "gregset.h" |
66 | ||
e750d25e | 67 | #include "i387-tdep.h" |
c3833324 | 68 | #include "i386-tdep.h" |
5179e78f AC |
69 | #include "i386-linux-tdep.h" |
70 | ||
b757528f JJ |
71 | /* Defines ps_err_e, struct ps_prochandle. */ |
72 | #include "gdb_proc_service.h" | |
6ce2ac0b | 73 | \f |
d4f3574e | 74 | |
a4b6fc86 AC |
75 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
76 | the register sets in `struct user' that is used for a.out | |
77 | core-dumps, and is also used by `ptrace'. The corresponding types | |
78 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
79 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
80 | for the floating-point registers. | |
81 | ||
82 | Those types used to be available under the names `gregset_t' and | |
83 | `fpregset_t' too, and this file used those names in the past. But | |
84 | those names are now used for the register sets used in the | |
85 | `mcontext_t' type, and have a different size and layout. */ | |
86 | ||
87 | /* Mapping between the general-purpose registers in `struct user' | |
88 | format and GDB's register array layout. */ | |
d4f3574e SS |
89 | static int regmap[] = |
90 | { | |
91 | EAX, ECX, EDX, EBX, | |
92 | UESP, EBP, ESI, EDI, | |
93 | EIP, EFL, CS, SS, | |
ce556f85 MK |
94 | DS, ES, FS, GS, |
95 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
96 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
97 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
98 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
99 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
100 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
101 | -1, /* mxcsr */ | |
102 | ORIG_EAX | |
d4f3574e SS |
103 | }; |
104 | ||
5c44784c JM |
105 | /* Which ptrace request retrieves which registers? |
106 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 107 | |
5c44784c | 108 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 109 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 110 | |
6ce2ac0b | 111 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 112 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 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 | |
5c44784c JM |
133 | 1 |
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 | |
fba45db2 | 145 | fetch_register (int regno) |
f60300e7 | 146 | { |
f60300e7 | 147 | int tid; |
ce556f85 | 148 | int val; |
f60300e7 | 149 | |
ce556f85 | 150 | gdb_assert (!have_ptrace_getregs); |
de732108 | 151 | if (regmap[regno] == -1) |
f60300e7 | 152 | { |
23a6d369 | 153 | regcache_raw_supply (current_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; |
de732108 | 163 | val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0); |
ce556f85 | 164 | if (errno != 0) |
8a3fe4f8 | 165 | error (_("Couldn't read register %s (#%d): %s."), REGISTER_NAME (regno), |
ce556f85 | 166 | regno, safe_strerror (errno)); |
f60300e7 | 167 | |
31828840 | 168 | regcache_raw_supply (current_regcache, regno, &val); |
f60300e7 MK |
169 | } |
170 | ||
f60300e7 MK |
171 | /* Store one register. */ |
172 | ||
173 | static void | |
fba45db2 | 174 | store_register (int regno) |
f60300e7 | 175 | { |
f60300e7 | 176 | int tid; |
ce556f85 | 177 | int val; |
f60300e7 | 178 | |
ce556f85 | 179 | gdb_assert (!have_ptrace_getregs); |
de732108 | 180 | if (regmap[regno] == -1) |
ce556f85 | 181 | return; |
f60300e7 | 182 | |
ce556f85 | 183 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
184 | tid = TIDGET (inferior_ptid); |
185 | if (tid == 0) | |
186 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 187 | |
ce556f85 | 188 | errno = 0; |
31828840 | 189 | regcache_raw_collect (current_regcache, regno, &val); |
de732108 | 190 | ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val); |
ce556f85 | 191 | if (errno != 0) |
8a3fe4f8 | 192 | error (_("Couldn't write register %s (#%d): %s."), REGISTER_NAME (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 |
04cd15b6 | 204 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 205 | { |
04cd15b6 | 206 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
6ce2ac0b | 207 | int i; |
d4f3574e | 208 | |
98df6387 | 209 | for (i = 0; i < I386_NUM_GREGS; i++) |
31828840 | 210 | regcache_raw_supply (current_regcache, i, regp + regmap[i]); |
3fb1c838 | 211 | |
82ea117a | 212 | if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) |
23a6d369 | 213 | regcache_raw_supply (current_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 |
04cd15b6 | 222 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 | 223 | { |
6ce2ac0b MK |
224 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
225 | int i; | |
04cd15b6 | 226 | |
98df6387 | 227 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 228 | if (regno == -1 || regno == i) |
31828840 | 229 | regcache_raw_collect (current_regcache, i, regp + regmap[i]); |
3fb1c838 | 230 | |
82ea117a MK |
231 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
232 | && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) | |
822c9732 | 233 | regcache_raw_collect (current_regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 234 | regp + ORIG_EAX); |
d4f3574e SS |
235 | } |
236 | ||
f60300e7 MK |
237 | #ifdef HAVE_PTRACE_GETREGS |
238 | ||
04cd15b6 MK |
239 | /* Fetch all general-purpose registers from process/thread TID and |
240 | store their values in GDB's register array. */ | |
d4f3574e | 241 | |
5c44784c | 242 | static void |
ed9a39eb | 243 | fetch_regs (int tid) |
5c44784c | 244 | { |
04cd15b6 | 245 | elf_gregset_t regs; |
5c44784c | 246 | |
6ce2ac0b | 247 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 248 | { |
f60300e7 MK |
249 | if (errno == EIO) |
250 | { | |
251 | /* The kernel we're running on doesn't support the GETREGS | |
252 | request. Reset `have_ptrace_getregs'. */ | |
253 | have_ptrace_getregs = 0; | |
254 | return; | |
255 | } | |
256 | ||
e2e0b3e5 | 257 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
258 | } |
259 | ||
04cd15b6 | 260 | supply_gregset (®s); |
5c44784c JM |
261 | } |
262 | ||
04cd15b6 MK |
263 | /* Store all valid general-purpose registers in GDB's register array |
264 | into the process/thread specified by TID. */ | |
5c44784c | 265 | |
5c44784c | 266 | static void |
6ce2ac0b | 267 | store_regs (int tid, int regno) |
5c44784c | 268 | { |
04cd15b6 | 269 | elf_gregset_t regs; |
5c44784c | 270 | |
6ce2ac0b | 271 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 272 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 273 | |
6ce2ac0b MK |
274 | fill_gregset (®s, regno); |
275 | ||
276 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 277 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
278 | } |
279 | ||
f60300e7 MK |
280 | #else |
281 | ||
282 | static void fetch_regs (int tid) {} | |
6ce2ac0b | 283 | static void store_regs (int tid, int regno) {} |
f60300e7 MK |
284 | |
285 | #endif | |
5c44784c | 286 | \f |
5c44784c | 287 | |
6ce2ac0b | 288 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 289 | |
04cd15b6 | 290 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 291 | *FPREGSETP. */ |
04cd15b6 | 292 | |
d4f3574e | 293 | void |
04cd15b6 | 294 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 295 | { |
41d041d6 | 296 | i387_supply_fsave (current_regcache, -1, fpregsetp); |
917317f4 | 297 | } |
d4f3574e | 298 | |
04cd15b6 MK |
299 | /* Fill register REGNO (if it is a floating-point register) in |
300 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
301 | do this for all registers. */ | |
917317f4 JM |
302 | |
303 | void | |
04cd15b6 | 304 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 305 | { |
6ce2ac0b | 306 | i387_fill_fsave ((char *) fpregsetp, regno); |
d4f3574e SS |
307 | } |
308 | ||
f60300e7 MK |
309 | #ifdef HAVE_PTRACE_GETREGS |
310 | ||
04cd15b6 MK |
311 | /* Fetch all floating-point registers from process/thread TID and store |
312 | thier values in GDB's register array. */ | |
917317f4 | 313 | |
d4f3574e | 314 | static void |
ed9a39eb | 315 | fetch_fpregs (int tid) |
d4f3574e | 316 | { |
04cd15b6 | 317 | elf_fpregset_t fpregs; |
d4f3574e | 318 | |
6ce2ac0b | 319 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 320 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 321 | |
04cd15b6 | 322 | supply_fpregset (&fpregs); |
d4f3574e SS |
323 | } |
324 | ||
04cd15b6 MK |
325 | /* Store all valid floating-point registers in GDB's register array |
326 | into the process/thread specified by TID. */ | |
d4f3574e | 327 | |
d4f3574e | 328 | static void |
6ce2ac0b | 329 | store_fpregs (int tid, int regno) |
d4f3574e | 330 | { |
04cd15b6 | 331 | elf_fpregset_t fpregs; |
d4f3574e | 332 | |
6ce2ac0b | 333 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 334 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 335 | |
6ce2ac0b | 336 | fill_fpregset (&fpregs, regno); |
d4f3574e | 337 | |
6ce2ac0b | 338 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 339 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
340 | } |
341 | ||
f60300e7 MK |
342 | #else |
343 | ||
344 | static void fetch_fpregs (int tid) {} | |
6ce2ac0b | 345 | static void store_fpregs (int tid, int regno) {} |
f60300e7 MK |
346 | |
347 | #endif | |
5c44784c | 348 | \f |
d4f3574e | 349 | |
6ce2ac0b | 350 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 351 | |
6ce2ac0b | 352 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
353 | |
354 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 355 | values in *FPXREGSETP. */ |
04cd15b6 | 356 | |
975aec09 | 357 | void |
6ce2ac0b | 358 | supply_fpxregset (elf_fpxregset_t *fpxregsetp) |
d4f3574e | 359 | { |
41d041d6 | 360 | i387_supply_fxsave (current_regcache, -1, fpxregsetp); |
d4f3574e SS |
361 | } |
362 | ||
6ce2ac0b MK |
363 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
364 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
365 | -1, do this for all registers. */ | |
d4f3574e | 366 | |
975aec09 | 367 | void |
6ce2ac0b | 368 | fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno) |
d4f3574e | 369 | { |
6ce2ac0b | 370 | i387_fill_fxsave ((char *) fpxregsetp, regno); |
5c44784c JM |
371 | } |
372 | ||
6ce2ac0b | 373 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
374 | process/thread TID and store their values in GDB's register array. |
375 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 376 | |
5c44784c | 377 | static int |
6ce2ac0b | 378 | fetch_fpxregs (int tid) |
5c44784c | 379 | { |
6ce2ac0b | 380 | elf_fpxregset_t fpxregs; |
5c44784c | 381 | |
6ce2ac0b | 382 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
383 | return 0; |
384 | ||
6ce2ac0b | 385 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 386 | { |
5c44784c JM |
387 | if (errno == EIO) |
388 | { | |
6ce2ac0b | 389 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
390 | return 0; |
391 | } | |
392 | ||
e2e0b3e5 | 393 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
394 | } |
395 | ||
6ce2ac0b | 396 | supply_fpxregset (&fpxregs); |
5c44784c JM |
397 | return 1; |
398 | } | |
d4f3574e | 399 | |
04cd15b6 | 400 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 401 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 402 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 403 | |
5c44784c | 404 | static int |
6ce2ac0b | 405 | store_fpxregs (int tid, int regno) |
5c44784c | 406 | { |
6ce2ac0b | 407 | elf_fpxregset_t fpxregs; |
5c44784c | 408 | |
6ce2ac0b | 409 | if (! have_ptrace_getfpxregs) |
5c44784c | 410 | return 0; |
6ce2ac0b MK |
411 | |
412 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
413 | { |
414 | if (errno == EIO) | |
415 | { | |
416 | have_ptrace_getfpxregs = 0; | |
417 | return 0; | |
418 | } | |
419 | ||
e2e0b3e5 | 420 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 421 | } |
5c44784c | 422 | |
6ce2ac0b | 423 | fill_fpxregset (&fpxregs, regno); |
5c44784c | 424 | |
6ce2ac0b | 425 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 426 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
427 | |
428 | return 1; | |
429 | } | |
430 | ||
5c44784c JM |
431 | #else |
432 | ||
f0373401 MK |
433 | static int fetch_fpxregs (int tid) { return 0; } |
434 | static int store_fpxregs (int tid, int regno) { return 0; } | |
5c44784c | 435 | |
6ce2ac0b | 436 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 437 | \f |
6ce2ac0b | 438 | |
5c44784c | 439 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 440 | |
04cd15b6 MK |
441 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
442 | this for all registers (including the floating point and SSE | |
443 | registers). */ | |
d4f3574e | 444 | |
10d6c8cd DJ |
445 | static void |
446 | i386_linux_fetch_inferior_registers (int regno) | |
d4f3574e | 447 | { |
ed9a39eb JM |
448 | int tid; |
449 | ||
f60300e7 MK |
450 | /* Use the old method of peeking around in `struct user' if the |
451 | GETREGS request isn't available. */ | |
ce556f85 | 452 | if (!have_ptrace_getregs) |
f60300e7 | 453 | { |
ce556f85 MK |
454 | int i; |
455 | ||
456 | for (i = 0; i < NUM_REGS; i++) | |
457 | if (regno == -1 || regno == i) | |
458 | fetch_register (i); | |
459 | ||
f60300e7 MK |
460 | return; |
461 | } | |
462 | ||
a4b6fc86 | 463 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
464 | tid = TIDGET (inferior_ptid); |
465 | if (tid == 0) | |
466 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 467 | |
6ce2ac0b | 468 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 469 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 470 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 471 | zero. */ |
5c44784c JM |
472 | if (regno == -1) |
473 | { | |
ed9a39eb | 474 | fetch_regs (tid); |
f60300e7 MK |
475 | |
476 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 477 | if (!have_ptrace_getregs) |
f60300e7 | 478 | { |
10d6c8cd | 479 | i386_linux_fetch_inferior_registers (regno); |
f60300e7 MK |
480 | return; |
481 | } | |
482 | ||
6ce2ac0b | 483 | if (fetch_fpxregs (tid)) |
5c44784c | 484 | return; |
ed9a39eb | 485 | fetch_fpregs (tid); |
5c44784c JM |
486 | return; |
487 | } | |
d4f3574e | 488 | |
5c44784c JM |
489 | if (GETREGS_SUPPLIES (regno)) |
490 | { | |
ed9a39eb | 491 | fetch_regs (tid); |
5c44784c JM |
492 | return; |
493 | } | |
494 | ||
6ce2ac0b | 495 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 496 | { |
6ce2ac0b | 497 | if (fetch_fpxregs (tid)) |
5c44784c JM |
498 | return; |
499 | ||
500 | /* Either our processor or our kernel doesn't support the SSE | |
501 | registers, so read the FP registers in the traditional way, | |
502 | and fill the SSE registers with dummy values. It would be | |
503 | more graceful to handle differences in the register set using | |
504 | gdbarch. Until then, this will at least make things work | |
505 | plausibly. */ | |
ed9a39eb | 506 | fetch_fpregs (tid); |
5c44784c JM |
507 | return; |
508 | } | |
509 | ||
8e65ff28 | 510 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 511 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
512 | } |
513 | ||
04cd15b6 MK |
514 | /* Store register REGNO back into the child process. If REGNO is -1, |
515 | do this for all registers (including the floating point and SSE | |
516 | registers). */ | |
10d6c8cd DJ |
517 | static void |
518 | i386_linux_store_inferior_registers (int regno) | |
d4f3574e | 519 | { |
ed9a39eb JM |
520 | int tid; |
521 | ||
f60300e7 MK |
522 | /* Use the old method of poking around in `struct user' if the |
523 | SETREGS request isn't available. */ | |
ce556f85 | 524 | if (!have_ptrace_getregs) |
f60300e7 | 525 | { |
ce556f85 MK |
526 | int i; |
527 | ||
528 | for (i = 0; i < NUM_REGS; i++) | |
529 | if (regno == -1 || regno == i) | |
530 | store_register (i); | |
531 | ||
f60300e7 MK |
532 | return; |
533 | } | |
534 | ||
a4b6fc86 | 535 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
536 | tid = TIDGET (inferior_ptid); |
537 | if (tid == 0) | |
538 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 539 | |
6ce2ac0b | 540 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 541 | transfers more registers in one system call. But remember that |
6ce2ac0b | 542 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
543 | if (regno == -1) |
544 | { | |
6ce2ac0b MK |
545 | store_regs (tid, regno); |
546 | if (store_fpxregs (tid, regno)) | |
5c44784c | 547 | return; |
6ce2ac0b | 548 | store_fpregs (tid, regno); |
5c44784c JM |
549 | return; |
550 | } | |
d4f3574e | 551 | |
5c44784c JM |
552 | if (GETREGS_SUPPLIES (regno)) |
553 | { | |
6ce2ac0b | 554 | store_regs (tid, regno); |
5c44784c JM |
555 | return; |
556 | } | |
557 | ||
6ce2ac0b | 558 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 559 | { |
6ce2ac0b | 560 | if (store_fpxregs (tid, regno)) |
5c44784c JM |
561 | return; |
562 | ||
563 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
564 | registers, so just write the FP registers in the traditional |
565 | way. */ | |
6ce2ac0b | 566 | store_fpregs (tid, regno); |
5c44784c JM |
567 | return; |
568 | } | |
569 | ||
8e65ff28 | 570 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 571 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 572 | } |
de57eccd | 573 | \f |
6ce2ac0b | 574 | |
4ffc8466 MK |
575 | /* Support for debug registers. */ |
576 | ||
7bf0983e | 577 | static unsigned long |
84346e11 MK |
578 | i386_linux_dr_get (int regnum) |
579 | { | |
580 | int tid; | |
7bf0983e | 581 | unsigned long value; |
84346e11 MK |
582 | |
583 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
584 | multi-threaded processes here. For now, pretend there is just | |
585 | one thread. */ | |
39f77062 | 586 | tid = PIDGET (inferior_ptid); |
84346e11 | 587 | |
b9511b9a MK |
588 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
589 | ptrace call fails breaks debugging remote targets. The correct | |
590 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 591 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 592 | ptrace call fails. */ |
84346e11 | 593 | errno = 0; |
ce556f85 | 594 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
595 | offsetof (struct user, u_debugreg[regnum]), 0); |
596 | if (errno != 0) | |
b9511b9a | 597 | #if 0 |
e2e0b3e5 | 598 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
599 | #else |
600 | return 0; | |
601 | #endif | |
84346e11 MK |
602 | |
603 | return value; | |
604 | } | |
605 | ||
606 | static void | |
7bf0983e | 607 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
608 | { |
609 | int tid; | |
610 | ||
611 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
612 | multi-threaded processes here. For now, pretend there is just | |
613 | one thread. */ | |
39f77062 | 614 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
615 | |
616 | errno = 0; | |
ce556f85 | 617 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
618 | offsetof (struct user, u_debugreg[regnum]), value); |
619 | if (errno != 0) | |
e2e0b3e5 | 620 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
621 | } |
622 | ||
623 | void | |
7bf0983e | 624 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
625 | { |
626 | i386_linux_dr_set (DR_CONTROL, control); | |
627 | } | |
628 | ||
629 | void | |
630 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
631 | { | |
632 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
633 | ||
634 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
635 | } | |
636 | ||
637 | void | |
638 | i386_linux_dr_reset_addr (int regnum) | |
639 | { | |
640 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
641 | ||
642 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
643 | } | |
644 | ||
7bf0983e | 645 | unsigned long |
84346e11 MK |
646 | i386_linux_dr_get_status (void) |
647 | { | |
648 | return i386_linux_dr_get (DR_STATUS); | |
649 | } | |
650 | \f | |
651 | ||
5bca7895 MK |
652 | /* Called by libthread_db. Returns a pointer to the thread local |
653 | storage (or its descriptor). */ | |
654 | ||
655 | ps_err_e | |
656 | ps_get_thread_area (const struct ps_prochandle *ph, | |
657 | lwpid_t lwpid, int idx, void **base) | |
658 | { | |
659 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
660 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
661 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
662 | and a bunch of status bits. | |
663 | ||
664 | The values returned by this ptrace call should be part of the | |
665 | regcache buffer, and ps_get_thread_area should channel its | |
666 | request through the regcache. That way remote targets could | |
667 | provide the value using the remote protocol and not this direct | |
668 | call. | |
669 | ||
670 | Is this function needed? I'm guessing that the `base' is the | |
671 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 672 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
673 | descriptor is defined by the ABI. Anyway, given that |
674 | libthread_db calls this function without prompting (gdb | |
675 | requesting tls base) I guess it needs info in there anyway. */ | |
676 | unsigned int desc[4]; | |
677 | gdb_assert (sizeof (int) == 4); | |
678 | ||
679 | #ifndef PTRACE_GET_THREAD_AREA | |
680 | #define PTRACE_GET_THREAD_AREA 25 | |
681 | #endif | |
682 | ||
683 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
684 | (void *) idx, (unsigned long) &desc) < 0) | |
685 | return PS_ERR; | |
686 | ||
687 | *(int *)base = desc[1]; | |
688 | return PS_OK; | |
689 | } | |
690 | \f | |
691 | ||
a4b6fc86 | 692 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
693 | int $0x80 |
694 | or 0xcd 0x80. */ | |
695 | ||
696 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
697 | ||
698 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
699 | ||
700 | /* The system call number is stored in the %eax register. */ | |
7532965f | 701 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
702 | |
703 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
704 | system calls. */ | |
705 | ||
706 | #ifndef SYS_sigreturn | |
707 | #define SYS_sigreturn 0x77 | |
708 | #endif | |
709 | #ifndef SYS_rt_sigreturn | |
710 | #define SYS_rt_sigreturn 0xad | |
711 | #endif | |
712 | ||
713 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
714 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
715 | ||
716 | /* Resume execution of the inferior process. | |
717 | If STEP is nonzero, single-step it. | |
718 | If SIGNAL is nonzero, give it that signal. */ | |
719 | ||
10d6c8cd DJ |
720 | static void |
721 | i386_linux_resume (ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 722 | { |
39f77062 KB |
723 | int pid = PIDGET (ptid); |
724 | ||
a6abb2c0 MK |
725 | int request = PTRACE_CONT; |
726 | ||
727 | if (pid == -1) | |
728 | /* Resume all threads. */ | |
729 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
730 | all threads" and "resume inferior_ptid" are the same. */ |
731 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
732 | |
733 | if (step) | |
734 | { | |
39f77062 | 735 | CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); |
8e70166d | 736 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
737 | |
738 | request = PTRACE_SINGLESTEP; | |
739 | ||
740 | /* Returning from a signal trampoline is done by calling a | |
741 | special system call (sigreturn or rt_sigreturn, see | |
742 | i386-linux-tdep.c for more information). This system call | |
743 | restores the registers that were saved when the signal was | |
744 | raised, including %eflags. That means that single-stepping | |
745 | won't work. Instead, we'll have to modify the signal context | |
746 | that's about to be restored, and set the trace flag there. */ | |
747 | ||
748 | /* First check if PC is at a system call. */ | |
359a9262 | 749 | if (read_memory_nobpt (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
750 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
751 | { | |
39f77062 KB |
752 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, |
753 | pid_to_ptid (pid)); | |
a6abb2c0 MK |
754 | |
755 | /* Then check the system call number. */ | |
756 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
757 | { | |
c7f16359 | 758 | CORE_ADDR sp = read_register (I386_ESP_REGNUM); |
a6abb2c0 MK |
759 | CORE_ADDR addr = sp; |
760 | unsigned long int eflags; | |
7bf0983e | 761 | |
a6abb2c0 MK |
762 | if (syscall == SYS_rt_sigreturn) |
763 | addr = read_memory_integer (sp + 8, 4) + 20; | |
764 | ||
765 | /* Set the trace flag in the context that's about to be | |
766 | restored. */ | |
767 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 768 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 769 | eflags |= 0x0100; |
8e70166d | 770 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
771 | } |
772 | } | |
773 | } | |
774 | ||
775 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 776 | perror_with_name (("ptrace")); |
a6abb2c0 | 777 | } |
4de4c07c | 778 | |
10d6c8cd DJ |
779 | static void (*super_post_startup_inferior) (ptid_t ptid); |
780 | ||
781 | static void | |
782 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
783 | { |
784 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
785 | super_post_startup_inferior (ptid); |
786 | } | |
787 | ||
788 | void | |
789 | _initialize_i386_linux_nat (void) | |
790 | { | |
791 | struct target_ops *t; | |
792 | ||
793 | /* Fill in the generic GNU/Linux methods. */ | |
794 | t = linux_target (); | |
795 | ||
796 | /* Override the default ptrace resume method. */ | |
797 | t->to_resume = i386_linux_resume; | |
798 | ||
799 | /* Override the GNU/Linux inferior startup hook. */ | |
800 | super_post_startup_inferior = t->to_post_startup_inferior; | |
801 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
802 | ||
803 | /* Add our register access methods. */ | |
804 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
805 | t->to_store_registers = i386_linux_store_inferior_registers; | |
806 | ||
807 | /* Register the target. */ | |
f973ed9c | 808 | linux_nat_add_target (t); |
4de4c07c | 809 | } |