Commit | Line | Data |
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a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
a4194092 | 3 | Copyright 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
d4f3574e | 4 | |
04cd15b6 | 5 | This file is part of GDB. |
d4f3574e | 6 | |
04cd15b6 MK |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
d4f3574e | 11 | |
04cd15b6 MK |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
d4f3574e | 16 | |
04cd15b6 MK |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
d4f3574e SS |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "gdbcore.h" | |
4e052eda | 25 | #include "regcache.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 | ||
6ce2ac0b | 65 | /* Prototypes for i387_supply_fsave etc. */ |
e750d25e | 66 | #include "i387-tdep.h" |
6ce2ac0b | 67 | |
c3833324 MS |
68 | /* Defines for XMM0_REGNUM etc. */ |
69 | #include "i386-tdep.h" | |
70 | ||
5179e78f AC |
71 | /* Defines I386_LINUX_ORIG_EAX_REGNUM. */ |
72 | #include "i386-linux-tdep.h" | |
73 | ||
b757528f JJ |
74 | /* Defines ps_err_e, struct ps_prochandle. */ |
75 | #include "gdb_proc_service.h" | |
6ce2ac0b | 76 | \f |
d4f3574e | 77 | |
a4b6fc86 AC |
78 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
79 | the register sets in `struct user' that is used for a.out | |
80 | core-dumps, and is also used by `ptrace'. The corresponding types | |
81 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
82 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
83 | for the floating-point registers. | |
84 | ||
85 | Those types used to be available under the names `gregset_t' and | |
86 | `fpregset_t' too, and this file used those names in the past. But | |
87 | those names are now used for the register sets used in the | |
88 | `mcontext_t' type, and have a different size and layout. */ | |
89 | ||
90 | /* Mapping between the general-purpose registers in `struct user' | |
91 | format and GDB's register array layout. */ | |
d4f3574e SS |
92 | static int regmap[] = |
93 | { | |
94 | EAX, ECX, EDX, EBX, | |
95 | UESP, EBP, ESI, EDI, | |
96 | EIP, EFL, CS, SS, | |
ce556f85 MK |
97 | DS, ES, FS, GS, |
98 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
99 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
100 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
101 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
102 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
103 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
104 | -1, /* mxcsr */ | |
105 | ORIG_EAX | |
d4f3574e SS |
106 | }; |
107 | ||
5c44784c JM |
108 | /* Which ptrace request retrieves which registers? |
109 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 110 | |
5c44784c | 111 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 112 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 113 | |
5c44784c JM |
114 | #define GETFPREGS_SUPPLIES(regno) \ |
115 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) | |
e64a344c | 116 | |
6ce2ac0b | 117 | #define GETFPXREGS_SUPPLIES(regno) \ |
5c44784c JM |
118 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
119 | ||
f60300e7 MK |
120 | /* Does the current host support the GETREGS request? */ |
121 | int have_ptrace_getregs = | |
122 | #ifdef HAVE_PTRACE_GETREGS | |
123 | 1 | |
124 | #else | |
125 | 0 | |
126 | #endif | |
127 | ; | |
128 | ||
6ce2ac0b | 129 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
130 | file may or may not define it, and even if it is defined, the |
131 | kernel will return EIO if it's running on a pre-SSE processor. | |
132 | ||
133 | My instinct is to attach this to some architecture- or | |
134 | target-specific data structure, but really, a particular GDB | |
135 | process can only run on top of one kernel at a time. So it's okay | |
136 | for this to be a simple variable. */ | |
6ce2ac0b MK |
137 | int have_ptrace_getfpxregs = |
138 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
139 | 1 |
140 | #else | |
141 | 0 | |
142 | #endif | |
143 | ; | |
f60300e7 | 144 | \f |
6ce2ac0b | 145 | |
84346e11 MK |
146 | /* Support for the user struct. */ |
147 | ||
148 | /* Return the address of register REGNUM. BLOCKEND is the value of | |
149 | u.u_ar0, which should point to the registers. */ | |
150 | ||
151 | CORE_ADDR | |
152 | register_u_addr (CORE_ADDR blockend, int regnum) | |
153 | { | |
154 | return (blockend + 4 * regmap[regnum]); | |
155 | } | |
156 | ||
157 | /* Return the size of the user struct. */ | |
158 | ||
159 | int | |
160 | kernel_u_size (void) | |
161 | { | |
162 | return (sizeof (struct user)); | |
163 | } | |
164 | \f | |
165 | ||
ce556f85 | 166 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
167 | |
168 | /* Fetch one register. */ | |
169 | ||
170 | static void | |
fba45db2 | 171 | fetch_register (int regno) |
f60300e7 | 172 | { |
f60300e7 | 173 | int tid; |
ce556f85 | 174 | int val; |
f60300e7 | 175 | |
ce556f85 MK |
176 | gdb_assert (!have_ptrace_getregs); |
177 | if (cannot_fetch_register (regno)) | |
f60300e7 | 178 | { |
23a6d369 | 179 | regcache_raw_supply (current_regcache, regno, NULL); |
f60300e7 MK |
180 | return; |
181 | } | |
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 MK |
188 | errno = 0; |
189 | val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0); | |
190 | if (errno != 0) | |
191 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno), | |
192 | regno, safe_strerror (errno)); | |
f60300e7 | 193 | |
23a6d369 | 194 | regcache_raw_supply (current_regcache, regno, &val); |
f60300e7 MK |
195 | } |
196 | ||
f60300e7 MK |
197 | /* Store one register. */ |
198 | ||
199 | static void | |
fba45db2 | 200 | store_register (int regno) |
f60300e7 | 201 | { |
f60300e7 | 202 | int tid; |
ce556f85 | 203 | int val; |
f60300e7 | 204 | |
ce556f85 MK |
205 | gdb_assert (!have_ptrace_getregs); |
206 | if (cannot_store_register (regno)) | |
207 | return; | |
f60300e7 | 208 | |
ce556f85 | 209 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
210 | tid = TIDGET (inferior_ptid); |
211 | if (tid == 0) | |
212 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 213 | |
ce556f85 | 214 | errno = 0; |
822c9732 | 215 | regcache_raw_collect (current_regcache, regno, &val); |
ce556f85 MK |
216 | ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val); |
217 | if (errno != 0) | |
e64a344c | 218 | error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regno), |
ce556f85 | 219 | regno, safe_strerror (errno)); |
f60300e7 | 220 | } |
5c44784c | 221 | \f |
6ce2ac0b | 222 | |
04cd15b6 MK |
223 | /* Transfering the general-purpose registers between GDB, inferiors |
224 | and core files. */ | |
225 | ||
ad2a4d09 | 226 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 227 | in *GREGSETP. */ |
5c44784c | 228 | |
d4f3574e | 229 | void |
04cd15b6 | 230 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 231 | { |
04cd15b6 | 232 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
6ce2ac0b | 233 | int i; |
d4f3574e | 234 | |
98df6387 | 235 | for (i = 0; i < I386_NUM_GREGS; i++) |
23a6d369 | 236 | regcache_raw_supply (current_regcache, i, regp + regmap[i]); |
3fb1c838 | 237 | |
82ea117a | 238 | if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) |
23a6d369 AC |
239 | regcache_raw_supply (current_regcache, I386_LINUX_ORIG_EAX_REGNUM, |
240 | regp + ORIG_EAX); | |
917317f4 JM |
241 | } |
242 | ||
04cd15b6 MK |
243 | /* Fill register REGNO (if it is a general-purpose register) in |
244 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
245 | do this for all registers. */ | |
6ce2ac0b | 246 | |
917317f4 | 247 | void |
04cd15b6 | 248 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 | 249 | { |
6ce2ac0b MK |
250 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
251 | int i; | |
04cd15b6 | 252 | |
98df6387 | 253 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 254 | if (regno == -1 || regno == i) |
822c9732 | 255 | regcache_raw_collect (current_regcache, i, regp + regmap[i]); |
3fb1c838 | 256 | |
82ea117a MK |
257 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
258 | && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) | |
822c9732 AC |
259 | regcache_raw_collect (current_regcache, I386_LINUX_ORIG_EAX_REGNUM, |
260 | regp + ORIG_EAX); | |
d4f3574e SS |
261 | } |
262 | ||
f60300e7 MK |
263 | #ifdef HAVE_PTRACE_GETREGS |
264 | ||
04cd15b6 MK |
265 | /* Fetch all general-purpose registers from process/thread TID and |
266 | store their values in GDB's register array. */ | |
d4f3574e | 267 | |
5c44784c | 268 | static void |
ed9a39eb | 269 | fetch_regs (int tid) |
5c44784c | 270 | { |
04cd15b6 | 271 | elf_gregset_t regs; |
5c44784c | 272 | |
6ce2ac0b | 273 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 274 | { |
f60300e7 MK |
275 | if (errno == EIO) |
276 | { | |
277 | /* The kernel we're running on doesn't support the GETREGS | |
278 | request. Reset `have_ptrace_getregs'. */ | |
279 | have_ptrace_getregs = 0; | |
280 | return; | |
281 | } | |
282 | ||
6ce2ac0b | 283 | perror_with_name ("Couldn't get registers"); |
5c44784c JM |
284 | } |
285 | ||
04cd15b6 | 286 | supply_gregset (®s); |
5c44784c JM |
287 | } |
288 | ||
04cd15b6 MK |
289 | /* Store all valid general-purpose registers in GDB's register array |
290 | into the process/thread specified by TID. */ | |
5c44784c | 291 | |
5c44784c | 292 | static void |
6ce2ac0b | 293 | store_regs (int tid, int regno) |
5c44784c | 294 | { |
04cd15b6 | 295 | elf_gregset_t regs; |
5c44784c | 296 | |
6ce2ac0b MK |
297 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
298 | perror_with_name ("Couldn't get registers"); | |
5c44784c | 299 | |
6ce2ac0b MK |
300 | fill_gregset (®s, regno); |
301 | ||
302 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
303 | perror_with_name ("Couldn't write registers"); | |
5c44784c JM |
304 | } |
305 | ||
f60300e7 MK |
306 | #else |
307 | ||
308 | static void fetch_regs (int tid) {} | |
6ce2ac0b | 309 | static void store_regs (int tid, int regno) {} |
f60300e7 MK |
310 | |
311 | #endif | |
5c44784c | 312 | \f |
5c44784c | 313 | |
6ce2ac0b | 314 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 315 | |
04cd15b6 | 316 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 317 | *FPREGSETP. */ |
04cd15b6 | 318 | |
d4f3574e | 319 | void |
04cd15b6 | 320 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 321 | { |
41d041d6 | 322 | i387_supply_fsave (current_regcache, -1, fpregsetp); |
917317f4 | 323 | } |
d4f3574e | 324 | |
04cd15b6 MK |
325 | /* Fill register REGNO (if it is a floating-point register) in |
326 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
327 | do this for all registers. */ | |
917317f4 JM |
328 | |
329 | void | |
04cd15b6 | 330 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 331 | { |
6ce2ac0b | 332 | i387_fill_fsave ((char *) fpregsetp, regno); |
d4f3574e SS |
333 | } |
334 | ||
f60300e7 MK |
335 | #ifdef HAVE_PTRACE_GETREGS |
336 | ||
04cd15b6 MK |
337 | /* Fetch all floating-point registers from process/thread TID and store |
338 | thier values in GDB's register array. */ | |
917317f4 | 339 | |
d4f3574e | 340 | static void |
ed9a39eb | 341 | fetch_fpregs (int tid) |
d4f3574e | 342 | { |
04cd15b6 | 343 | elf_fpregset_t fpregs; |
d4f3574e | 344 | |
6ce2ac0b MK |
345 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
346 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 347 | |
04cd15b6 | 348 | supply_fpregset (&fpregs); |
d4f3574e SS |
349 | } |
350 | ||
04cd15b6 MK |
351 | /* Store all valid floating-point registers in GDB's register array |
352 | into the process/thread specified by TID. */ | |
d4f3574e | 353 | |
d4f3574e | 354 | static void |
6ce2ac0b | 355 | store_fpregs (int tid, int regno) |
d4f3574e | 356 | { |
04cd15b6 | 357 | elf_fpregset_t fpregs; |
d4f3574e | 358 | |
6ce2ac0b MK |
359 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
360 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 361 | |
6ce2ac0b | 362 | fill_fpregset (&fpregs, regno); |
d4f3574e | 363 | |
6ce2ac0b MK |
364 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
365 | perror_with_name ("Couldn't write floating point status"); | |
d4f3574e SS |
366 | } |
367 | ||
f60300e7 MK |
368 | #else |
369 | ||
370 | static void fetch_fpregs (int tid) {} | |
6ce2ac0b | 371 | static void store_fpregs (int tid, int regno) {} |
f60300e7 MK |
372 | |
373 | #endif | |
5c44784c | 374 | \f |
d4f3574e | 375 | |
6ce2ac0b | 376 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 377 | |
6ce2ac0b | 378 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
379 | |
380 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 381 | values in *FPXREGSETP. */ |
04cd15b6 | 382 | |
975aec09 | 383 | void |
6ce2ac0b | 384 | supply_fpxregset (elf_fpxregset_t *fpxregsetp) |
d4f3574e | 385 | { |
41d041d6 | 386 | i387_supply_fxsave (current_regcache, -1, fpxregsetp); |
d4f3574e SS |
387 | } |
388 | ||
6ce2ac0b MK |
389 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
390 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
391 | -1, do this for all registers. */ | |
d4f3574e | 392 | |
975aec09 | 393 | void |
6ce2ac0b | 394 | fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno) |
d4f3574e | 395 | { |
6ce2ac0b | 396 | i387_fill_fxsave ((char *) fpxregsetp, regno); |
5c44784c JM |
397 | } |
398 | ||
6ce2ac0b | 399 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
400 | process/thread TID and store their values in GDB's register array. |
401 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 402 | |
5c44784c | 403 | static int |
6ce2ac0b | 404 | fetch_fpxregs (int tid) |
5c44784c | 405 | { |
6ce2ac0b | 406 | elf_fpxregset_t fpxregs; |
5c44784c | 407 | |
6ce2ac0b | 408 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
409 | return 0; |
410 | ||
6ce2ac0b | 411 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 412 | { |
5c44784c JM |
413 | if (errno == EIO) |
414 | { | |
6ce2ac0b | 415 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
416 | return 0; |
417 | } | |
418 | ||
6ce2ac0b | 419 | perror_with_name ("Couldn't read floating-point and SSE registers"); |
d4f3574e SS |
420 | } |
421 | ||
6ce2ac0b | 422 | supply_fpxregset (&fpxregs); |
5c44784c JM |
423 | return 1; |
424 | } | |
d4f3574e | 425 | |
04cd15b6 | 426 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 427 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 428 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 429 | |
5c44784c | 430 | static int |
6ce2ac0b | 431 | store_fpxregs (int tid, int regno) |
5c44784c | 432 | { |
6ce2ac0b | 433 | elf_fpxregset_t fpxregs; |
5c44784c | 434 | |
6ce2ac0b | 435 | if (! have_ptrace_getfpxregs) |
5c44784c | 436 | return 0; |
6ce2ac0b MK |
437 | |
438 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
439 | { |
440 | if (errno == EIO) | |
441 | { | |
442 | have_ptrace_getfpxregs = 0; | |
443 | return 0; | |
444 | } | |
445 | ||
446 | perror_with_name ("Couldn't read floating-point and SSE registers"); | |
447 | } | |
5c44784c | 448 | |
6ce2ac0b | 449 | fill_fpxregset (&fpxregs, regno); |
5c44784c | 450 | |
6ce2ac0b MK |
451 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
452 | perror_with_name ("Couldn't write floating-point and SSE registers"); | |
5c44784c JM |
453 | |
454 | return 1; | |
455 | } | |
456 | ||
5c44784c JM |
457 | #else |
458 | ||
f0373401 MK |
459 | static int fetch_fpxregs (int tid) { return 0; } |
460 | static int store_fpxregs (int tid, int regno) { return 0; } | |
5c44784c | 461 | |
6ce2ac0b | 462 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 463 | \f |
6ce2ac0b | 464 | |
5c44784c | 465 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 466 | |
d5d65353 PS |
467 | /* Check if register REGNO in the child process is accessible. |
468 | If we are accessing registers directly via the U area, only the | |
469 | general-purpose registers are available. | |
470 | All registers should be accessible if we have GETREGS support. */ | |
471 | ||
472 | int | |
473 | cannot_fetch_register (int regno) | |
474 | { | |
ce556f85 MK |
475 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
476 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 | 477 | } |
ce556f85 | 478 | |
d5d65353 PS |
479 | int |
480 | cannot_store_register (int regno) | |
481 | { | |
ce556f85 MK |
482 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
483 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 PS |
484 | } |
485 | ||
04cd15b6 MK |
486 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
487 | this for all registers (including the floating point and SSE | |
488 | registers). */ | |
d4f3574e SS |
489 | |
490 | void | |
917317f4 | 491 | fetch_inferior_registers (int regno) |
d4f3574e | 492 | { |
ed9a39eb JM |
493 | int tid; |
494 | ||
f60300e7 MK |
495 | /* Use the old method of peeking around in `struct user' if the |
496 | GETREGS request isn't available. */ | |
ce556f85 | 497 | if (!have_ptrace_getregs) |
f60300e7 | 498 | { |
ce556f85 MK |
499 | int i; |
500 | ||
501 | for (i = 0; i < NUM_REGS; i++) | |
502 | if (regno == -1 || regno == i) | |
503 | fetch_register (i); | |
504 | ||
f60300e7 MK |
505 | return; |
506 | } | |
507 | ||
a4b6fc86 | 508 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
509 | tid = TIDGET (inferior_ptid); |
510 | if (tid == 0) | |
511 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 512 | |
6ce2ac0b | 513 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 514 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 515 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 516 | zero. */ |
5c44784c JM |
517 | if (regno == -1) |
518 | { | |
ed9a39eb | 519 | fetch_regs (tid); |
f60300e7 MK |
520 | |
521 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 522 | if (!have_ptrace_getregs) |
f60300e7 | 523 | { |
ce556f85 | 524 | fetch_inferior_registers (regno); |
f60300e7 MK |
525 | return; |
526 | } | |
527 | ||
6ce2ac0b | 528 | if (fetch_fpxregs (tid)) |
5c44784c | 529 | return; |
ed9a39eb | 530 | fetch_fpregs (tid); |
5c44784c JM |
531 | return; |
532 | } | |
d4f3574e | 533 | |
5c44784c JM |
534 | if (GETREGS_SUPPLIES (regno)) |
535 | { | |
ed9a39eb | 536 | fetch_regs (tid); |
5c44784c JM |
537 | return; |
538 | } | |
539 | ||
6ce2ac0b | 540 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 541 | { |
6ce2ac0b | 542 | if (fetch_fpxregs (tid)) |
5c44784c JM |
543 | return; |
544 | ||
545 | /* Either our processor or our kernel doesn't support the SSE | |
546 | registers, so read the FP registers in the traditional way, | |
547 | and fill the SSE registers with dummy values. It would be | |
548 | more graceful to handle differences in the register set using | |
549 | gdbarch. Until then, this will at least make things work | |
550 | plausibly. */ | |
ed9a39eb | 551 | fetch_fpregs (tid); |
5c44784c JM |
552 | return; |
553 | } | |
554 | ||
8e65ff28 AC |
555 | internal_error (__FILE__, __LINE__, |
556 | "Got request for bad register number %d.", regno); | |
d4f3574e SS |
557 | } |
558 | ||
04cd15b6 MK |
559 | /* Store register REGNO back into the child process. If REGNO is -1, |
560 | do this for all registers (including the floating point and SSE | |
561 | registers). */ | |
d4f3574e | 562 | void |
04cd15b6 | 563 | store_inferior_registers (int regno) |
d4f3574e | 564 | { |
ed9a39eb JM |
565 | int tid; |
566 | ||
f60300e7 MK |
567 | /* Use the old method of poking around in `struct user' if the |
568 | SETREGS request isn't available. */ | |
ce556f85 | 569 | if (!have_ptrace_getregs) |
f60300e7 | 570 | { |
ce556f85 MK |
571 | int i; |
572 | ||
573 | for (i = 0; i < NUM_REGS; i++) | |
574 | if (regno == -1 || regno == i) | |
575 | store_register (i); | |
576 | ||
f60300e7 MK |
577 | return; |
578 | } | |
579 | ||
a4b6fc86 | 580 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
581 | tid = TIDGET (inferior_ptid); |
582 | if (tid == 0) | |
583 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 584 | |
6ce2ac0b | 585 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 586 | transfers more registers in one system call. But remember that |
6ce2ac0b | 587 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
588 | if (regno == -1) |
589 | { | |
6ce2ac0b MK |
590 | store_regs (tid, regno); |
591 | if (store_fpxregs (tid, regno)) | |
5c44784c | 592 | return; |
6ce2ac0b | 593 | store_fpregs (tid, regno); |
5c44784c JM |
594 | return; |
595 | } | |
d4f3574e | 596 | |
5c44784c JM |
597 | if (GETREGS_SUPPLIES (regno)) |
598 | { | |
6ce2ac0b | 599 | store_regs (tid, regno); |
5c44784c JM |
600 | return; |
601 | } | |
602 | ||
6ce2ac0b | 603 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 604 | { |
6ce2ac0b | 605 | if (store_fpxregs (tid, regno)) |
5c44784c JM |
606 | return; |
607 | ||
608 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
609 | registers, so just write the FP registers in the traditional |
610 | way. */ | |
6ce2ac0b | 611 | store_fpregs (tid, regno); |
5c44784c JM |
612 | return; |
613 | } | |
614 | ||
8e65ff28 AC |
615 | internal_error (__FILE__, __LINE__, |
616 | "Got request to store bad register number %d.", regno); | |
d4f3574e | 617 | } |
de57eccd | 618 | \f |
6ce2ac0b | 619 | |
4ffc8466 MK |
620 | /* Support for debug registers. */ |
621 | ||
7bf0983e | 622 | static unsigned long |
84346e11 MK |
623 | i386_linux_dr_get (int regnum) |
624 | { | |
625 | int tid; | |
7bf0983e | 626 | unsigned long value; |
84346e11 MK |
627 | |
628 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
629 | multi-threaded processes here. For now, pretend there is just | |
630 | one thread. */ | |
39f77062 | 631 | tid = PIDGET (inferior_ptid); |
84346e11 | 632 | |
b9511b9a MK |
633 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
634 | ptrace call fails breaks debugging remote targets. The correct | |
635 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 636 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 637 | ptrace call fails. */ |
84346e11 | 638 | errno = 0; |
ce556f85 | 639 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
640 | offsetof (struct user, u_debugreg[regnum]), 0); |
641 | if (errno != 0) | |
b9511b9a | 642 | #if 0 |
84346e11 | 643 | perror_with_name ("Couldn't read debug register"); |
b9511b9a MK |
644 | #else |
645 | return 0; | |
646 | #endif | |
84346e11 MK |
647 | |
648 | return value; | |
649 | } | |
650 | ||
651 | static void | |
7bf0983e | 652 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
653 | { |
654 | int tid; | |
655 | ||
656 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
657 | multi-threaded processes here. For now, pretend there is just | |
658 | one thread. */ | |
39f77062 | 659 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
660 | |
661 | errno = 0; | |
ce556f85 | 662 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
663 | offsetof (struct user, u_debugreg[regnum]), value); |
664 | if (errno != 0) | |
665 | perror_with_name ("Couldn't write debug register"); | |
666 | } | |
667 | ||
668 | void | |
7bf0983e | 669 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
670 | { |
671 | i386_linux_dr_set (DR_CONTROL, control); | |
672 | } | |
673 | ||
674 | void | |
675 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
676 | { | |
677 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
678 | ||
679 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
680 | } | |
681 | ||
682 | void | |
683 | i386_linux_dr_reset_addr (int regnum) | |
684 | { | |
685 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
686 | ||
687 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
688 | } | |
689 | ||
7bf0983e | 690 | unsigned long |
84346e11 MK |
691 | i386_linux_dr_get_status (void) |
692 | { | |
693 | return i386_linux_dr_get (DR_STATUS); | |
694 | } | |
695 | \f | |
696 | ||
5bca7895 MK |
697 | /* Called by libthread_db. Returns a pointer to the thread local |
698 | storage (or its descriptor). */ | |
699 | ||
700 | ps_err_e | |
701 | ps_get_thread_area (const struct ps_prochandle *ph, | |
702 | lwpid_t lwpid, int idx, void **base) | |
703 | { | |
704 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
705 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
706 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
707 | and a bunch of status bits. | |
708 | ||
709 | The values returned by this ptrace call should be part of the | |
710 | regcache buffer, and ps_get_thread_area should channel its | |
711 | request through the regcache. That way remote targets could | |
712 | provide the value using the remote protocol and not this direct | |
713 | call. | |
714 | ||
715 | Is this function needed? I'm guessing that the `base' is the | |
716 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 717 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
718 | descriptor is defined by the ABI. Anyway, given that |
719 | libthread_db calls this function without prompting (gdb | |
720 | requesting tls base) I guess it needs info in there anyway. */ | |
721 | unsigned int desc[4]; | |
722 | gdb_assert (sizeof (int) == 4); | |
723 | ||
724 | #ifndef PTRACE_GET_THREAD_AREA | |
725 | #define PTRACE_GET_THREAD_AREA 25 | |
726 | #endif | |
727 | ||
728 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
729 | (void *) idx, (unsigned long) &desc) < 0) | |
730 | return PS_ERR; | |
731 | ||
732 | *(int *)base = desc[1]; | |
733 | return PS_OK; | |
734 | } | |
735 | \f | |
736 | ||
a4b6fc86 | 737 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
738 | int $0x80 |
739 | or 0xcd 0x80. */ | |
740 | ||
741 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
742 | ||
743 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
744 | ||
745 | /* The system call number is stored in the %eax register. */ | |
7532965f | 746 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
747 | |
748 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
749 | system calls. */ | |
750 | ||
751 | #ifndef SYS_sigreturn | |
752 | #define SYS_sigreturn 0x77 | |
753 | #endif | |
754 | #ifndef SYS_rt_sigreturn | |
755 | #define SYS_rt_sigreturn 0xad | |
756 | #endif | |
757 | ||
758 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
759 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
760 | ||
761 | /* Resume execution of the inferior process. | |
762 | If STEP is nonzero, single-step it. | |
763 | If SIGNAL is nonzero, give it that signal. */ | |
764 | ||
765 | void | |
39f77062 | 766 | child_resume (ptid_t ptid, int step, enum target_signal signal) |
a6abb2c0 | 767 | { |
39f77062 KB |
768 | int pid = PIDGET (ptid); |
769 | ||
a6abb2c0 MK |
770 | int request = PTRACE_CONT; |
771 | ||
772 | if (pid == -1) | |
773 | /* Resume all threads. */ | |
774 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
775 | all threads" and "resume inferior_ptid" are the same. */ |
776 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
777 | |
778 | if (step) | |
779 | { | |
39f77062 | 780 | CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); |
a6abb2c0 MK |
781 | unsigned char buf[LINUX_SYSCALL_LEN]; |
782 | ||
783 | request = PTRACE_SINGLESTEP; | |
784 | ||
785 | /* Returning from a signal trampoline is done by calling a | |
786 | special system call (sigreturn or rt_sigreturn, see | |
787 | i386-linux-tdep.c for more information). This system call | |
788 | restores the registers that were saved when the signal was | |
789 | raised, including %eflags. That means that single-stepping | |
790 | won't work. Instead, we'll have to modify the signal context | |
791 | that's about to be restored, and set the trace flag there. */ | |
792 | ||
793 | /* First check if PC is at a system call. */ | |
1f602b35 | 794 | if (deprecated_read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
795 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
796 | { | |
39f77062 KB |
797 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, |
798 | pid_to_ptid (pid)); | |
a6abb2c0 MK |
799 | |
800 | /* Then check the system call number. */ | |
801 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
802 | { | |
c7f16359 | 803 | CORE_ADDR sp = read_register (I386_ESP_REGNUM); |
a6abb2c0 MK |
804 | CORE_ADDR addr = sp; |
805 | unsigned long int eflags; | |
7bf0983e | 806 | |
a6abb2c0 MK |
807 | if (syscall == SYS_rt_sigreturn) |
808 | addr = read_memory_integer (sp + 8, 4) + 20; | |
809 | ||
810 | /* Set the trace flag in the context that's about to be | |
811 | restored. */ | |
812 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
813 | read_memory (addr, (char *) &eflags, 4); | |
814 | eflags |= 0x0100; | |
815 | write_memory (addr, (char *) &eflags, 4); | |
816 | } | |
817 | } | |
818 | } | |
819 | ||
820 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
821 | perror_with_name ("ptrace"); | |
822 | } | |
4de4c07c DJ |
823 | |
824 | void | |
825 | child_post_startup_inferior (ptid_t ptid) | |
826 | { | |
827 | i386_cleanup_dregs (); | |
828 | linux_child_post_startup_inferior (ptid); | |
829 | } |