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" | |
76 | ||
756ed206 MK |
77 | /* Prototypes for local functions. */ |
78 | static void dummy_sse_values (void); | |
6ce2ac0b | 79 | \f |
d4f3574e | 80 | |
a4b6fc86 AC |
81 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
82 | the register sets in `struct user' that is used for a.out | |
83 | core-dumps, and is also used by `ptrace'. The corresponding types | |
84 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
85 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
86 | for the floating-point registers. | |
87 | ||
88 | Those types used to be available under the names `gregset_t' and | |
89 | `fpregset_t' too, and this file used those names in the past. But | |
90 | those names are now used for the register sets used in the | |
91 | `mcontext_t' type, and have a different size and layout. */ | |
92 | ||
93 | /* Mapping between the general-purpose registers in `struct user' | |
94 | format and GDB's register array layout. */ | |
d4f3574e SS |
95 | static int regmap[] = |
96 | { | |
97 | EAX, ECX, EDX, EBX, | |
98 | UESP, EBP, ESI, EDI, | |
99 | EIP, EFL, CS, SS, | |
ce556f85 MK |
100 | DS, ES, FS, GS, |
101 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
102 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
103 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
104 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
105 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
106 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
107 | -1, /* mxcsr */ | |
108 | ORIG_EAX | |
d4f3574e SS |
109 | }; |
110 | ||
5c44784c JM |
111 | /* Which ptrace request retrieves which registers? |
112 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 113 | |
5c44784c | 114 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 115 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 116 | |
5c44784c JM |
117 | #define GETFPREGS_SUPPLIES(regno) \ |
118 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) | |
e64a344c | 119 | |
6ce2ac0b | 120 | #define GETFPXREGS_SUPPLIES(regno) \ |
5c44784c JM |
121 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
122 | ||
f60300e7 MK |
123 | /* Does the current host support the GETREGS request? */ |
124 | int have_ptrace_getregs = | |
125 | #ifdef HAVE_PTRACE_GETREGS | |
126 | 1 | |
127 | #else | |
128 | 0 | |
129 | #endif | |
130 | ; | |
131 | ||
6ce2ac0b | 132 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
133 | file may or may not define it, and even if it is defined, the |
134 | kernel will return EIO if it's running on a pre-SSE processor. | |
135 | ||
136 | My instinct is to attach this to some architecture- or | |
137 | target-specific data structure, but really, a particular GDB | |
138 | process can only run on top of one kernel at a time. So it's okay | |
139 | for this to be a simple variable. */ | |
6ce2ac0b MK |
140 | int have_ptrace_getfpxregs = |
141 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
142 | 1 |
143 | #else | |
144 | 0 | |
145 | #endif | |
146 | ; | |
f60300e7 | 147 | \f |
6ce2ac0b | 148 | |
84346e11 MK |
149 | /* Support for the user struct. */ |
150 | ||
151 | /* Return the address of register REGNUM. BLOCKEND is the value of | |
152 | u.u_ar0, which should point to the registers. */ | |
153 | ||
154 | CORE_ADDR | |
155 | register_u_addr (CORE_ADDR blockend, int regnum) | |
156 | { | |
157 | return (blockend + 4 * regmap[regnum]); | |
158 | } | |
159 | ||
160 | /* Return the size of the user struct. */ | |
161 | ||
162 | int | |
163 | kernel_u_size (void) | |
164 | { | |
165 | return (sizeof (struct user)); | |
166 | } | |
167 | \f | |
168 | ||
ce556f85 | 169 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
170 | |
171 | /* Fetch one register. */ | |
172 | ||
173 | static void | |
fba45db2 | 174 | fetch_register (int regno) |
f60300e7 | 175 | { |
f60300e7 | 176 | int tid; |
ce556f85 | 177 | int val; |
f60300e7 | 178 | |
ce556f85 MK |
179 | gdb_assert (!have_ptrace_getregs); |
180 | if (cannot_fetch_register (regno)) | |
f60300e7 | 181 | { |
23a6d369 | 182 | regcache_raw_supply (current_regcache, regno, NULL); |
f60300e7 MK |
183 | return; |
184 | } | |
185 | ||
ce556f85 | 186 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
187 | tid = TIDGET (inferior_ptid); |
188 | if (tid == 0) | |
189 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 190 | |
ce556f85 MK |
191 | errno = 0; |
192 | val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0); | |
193 | if (errno != 0) | |
194 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno), | |
195 | regno, safe_strerror (errno)); | |
f60300e7 | 196 | |
23a6d369 | 197 | regcache_raw_supply (current_regcache, regno, &val); |
f60300e7 MK |
198 | } |
199 | ||
f60300e7 MK |
200 | /* Store one register. */ |
201 | ||
202 | static void | |
fba45db2 | 203 | store_register (int regno) |
f60300e7 | 204 | { |
f60300e7 | 205 | int tid; |
ce556f85 | 206 | int val; |
f60300e7 | 207 | |
ce556f85 MK |
208 | gdb_assert (!have_ptrace_getregs); |
209 | if (cannot_store_register (regno)) | |
210 | return; | |
f60300e7 | 211 | |
ce556f85 | 212 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
213 | tid = TIDGET (inferior_ptid); |
214 | if (tid == 0) | |
215 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 216 | |
ce556f85 MK |
217 | errno = 0; |
218 | regcache_collect (regno, &val); | |
219 | ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val); | |
220 | if (errno != 0) | |
e64a344c | 221 | error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regno), |
ce556f85 | 222 | regno, safe_strerror (errno)); |
f60300e7 | 223 | } |
5c44784c | 224 | \f |
6ce2ac0b | 225 | |
04cd15b6 MK |
226 | /* Transfering the general-purpose registers between GDB, inferiors |
227 | and core files. */ | |
228 | ||
ad2a4d09 | 229 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 230 | in *GREGSETP. */ |
5c44784c | 231 | |
d4f3574e | 232 | void |
04cd15b6 | 233 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 234 | { |
04cd15b6 | 235 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
6ce2ac0b | 236 | int i; |
d4f3574e | 237 | |
98df6387 | 238 | for (i = 0; i < I386_NUM_GREGS; i++) |
23a6d369 | 239 | regcache_raw_supply (current_regcache, i, regp + regmap[i]); |
3fb1c838 | 240 | |
82ea117a | 241 | if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) |
23a6d369 AC |
242 | regcache_raw_supply (current_regcache, I386_LINUX_ORIG_EAX_REGNUM, |
243 | regp + ORIG_EAX); | |
917317f4 JM |
244 | } |
245 | ||
04cd15b6 MK |
246 | /* Fill register REGNO (if it is a general-purpose register) in |
247 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
248 | do this for all registers. */ | |
6ce2ac0b | 249 | |
917317f4 | 250 | void |
04cd15b6 | 251 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 | 252 | { |
6ce2ac0b MK |
253 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
254 | int i; | |
04cd15b6 | 255 | |
98df6387 | 256 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 257 | if (regno == -1 || regno == i) |
8a406745 | 258 | regcache_collect (i, regp + regmap[i]); |
3fb1c838 | 259 | |
82ea117a MK |
260 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
261 | && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) | |
76fb44f4 | 262 | regcache_collect (I386_LINUX_ORIG_EAX_REGNUM, regp + ORIG_EAX); |
d4f3574e SS |
263 | } |
264 | ||
f60300e7 MK |
265 | #ifdef HAVE_PTRACE_GETREGS |
266 | ||
04cd15b6 MK |
267 | /* Fetch all general-purpose registers from process/thread TID and |
268 | store their values in GDB's register array. */ | |
d4f3574e | 269 | |
5c44784c | 270 | static void |
ed9a39eb | 271 | fetch_regs (int tid) |
5c44784c | 272 | { |
04cd15b6 | 273 | elf_gregset_t regs; |
5c44784c | 274 | |
6ce2ac0b | 275 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 276 | { |
f60300e7 MK |
277 | if (errno == EIO) |
278 | { | |
279 | /* The kernel we're running on doesn't support the GETREGS | |
280 | request. Reset `have_ptrace_getregs'. */ | |
281 | have_ptrace_getregs = 0; | |
282 | return; | |
283 | } | |
284 | ||
6ce2ac0b | 285 | perror_with_name ("Couldn't get registers"); |
5c44784c JM |
286 | } |
287 | ||
04cd15b6 | 288 | supply_gregset (®s); |
5c44784c JM |
289 | } |
290 | ||
04cd15b6 MK |
291 | /* Store all valid general-purpose registers in GDB's register array |
292 | into the process/thread specified by TID. */ | |
5c44784c | 293 | |
5c44784c | 294 | static void |
6ce2ac0b | 295 | store_regs (int tid, int regno) |
5c44784c | 296 | { |
04cd15b6 | 297 | elf_gregset_t regs; |
5c44784c | 298 | |
6ce2ac0b MK |
299 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
300 | perror_with_name ("Couldn't get registers"); | |
5c44784c | 301 | |
6ce2ac0b MK |
302 | fill_gregset (®s, regno); |
303 | ||
304 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
305 | perror_with_name ("Couldn't write registers"); | |
5c44784c JM |
306 | } |
307 | ||
f60300e7 MK |
308 | #else |
309 | ||
310 | static void fetch_regs (int tid) {} | |
6ce2ac0b | 311 | static void store_regs (int tid, int regno) {} |
f60300e7 MK |
312 | |
313 | #endif | |
5c44784c | 314 | \f |
5c44784c | 315 | |
6ce2ac0b | 316 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 317 | |
04cd15b6 | 318 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 319 | *FPREGSETP. */ |
04cd15b6 | 320 | |
d4f3574e | 321 | void |
04cd15b6 | 322 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 323 | { |
41d041d6 | 324 | i387_supply_fsave (current_regcache, -1, fpregsetp); |
756ed206 | 325 | dummy_sse_values (); |
917317f4 | 326 | } |
d4f3574e | 327 | |
04cd15b6 MK |
328 | /* Fill register REGNO (if it is a floating-point register) in |
329 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
330 | do this for all registers. */ | |
917317f4 JM |
331 | |
332 | void | |
04cd15b6 | 333 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 334 | { |
6ce2ac0b | 335 | i387_fill_fsave ((char *) fpregsetp, regno); |
d4f3574e SS |
336 | } |
337 | ||
f60300e7 MK |
338 | #ifdef HAVE_PTRACE_GETREGS |
339 | ||
04cd15b6 MK |
340 | /* Fetch all floating-point registers from process/thread TID and store |
341 | thier values in GDB's register array. */ | |
917317f4 | 342 | |
d4f3574e | 343 | static void |
ed9a39eb | 344 | fetch_fpregs (int tid) |
d4f3574e | 345 | { |
04cd15b6 | 346 | elf_fpregset_t fpregs; |
d4f3574e | 347 | |
6ce2ac0b MK |
348 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
349 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 350 | |
04cd15b6 | 351 | supply_fpregset (&fpregs); |
d4f3574e SS |
352 | } |
353 | ||
04cd15b6 MK |
354 | /* Store all valid floating-point registers in GDB's register array |
355 | into the process/thread specified by TID. */ | |
d4f3574e | 356 | |
d4f3574e | 357 | static void |
6ce2ac0b | 358 | store_fpregs (int tid, int regno) |
d4f3574e | 359 | { |
04cd15b6 | 360 | elf_fpregset_t fpregs; |
d4f3574e | 361 | |
6ce2ac0b MK |
362 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
363 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 364 | |
6ce2ac0b | 365 | fill_fpregset (&fpregs, regno); |
d4f3574e | 366 | |
6ce2ac0b MK |
367 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
368 | perror_with_name ("Couldn't write floating point status"); | |
d4f3574e SS |
369 | } |
370 | ||
f60300e7 MK |
371 | #else |
372 | ||
373 | static void fetch_fpregs (int tid) {} | |
6ce2ac0b | 374 | static void store_fpregs (int tid, int regno) {} |
f60300e7 MK |
375 | |
376 | #endif | |
5c44784c | 377 | \f |
d4f3574e | 378 | |
6ce2ac0b | 379 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 380 | |
6ce2ac0b | 381 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
382 | |
383 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 384 | values in *FPXREGSETP. */ |
04cd15b6 | 385 | |
975aec09 | 386 | void |
6ce2ac0b | 387 | supply_fpxregset (elf_fpxregset_t *fpxregsetp) |
d4f3574e | 388 | { |
41d041d6 | 389 | i387_supply_fxsave (current_regcache, -1, fpxregsetp); |
d4f3574e SS |
390 | } |
391 | ||
6ce2ac0b MK |
392 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
393 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
394 | -1, do this for all registers. */ | |
d4f3574e | 395 | |
975aec09 | 396 | void |
6ce2ac0b | 397 | fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno) |
d4f3574e | 398 | { |
6ce2ac0b | 399 | i387_fill_fxsave ((char *) fpxregsetp, regno); |
5c44784c JM |
400 | } |
401 | ||
6ce2ac0b | 402 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
403 | process/thread TID and store their values in GDB's register array. |
404 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 405 | |
5c44784c | 406 | static int |
6ce2ac0b | 407 | fetch_fpxregs (int tid) |
5c44784c | 408 | { |
6ce2ac0b | 409 | elf_fpxregset_t fpxregs; |
5c44784c | 410 | |
6ce2ac0b | 411 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
412 | return 0; |
413 | ||
6ce2ac0b | 414 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 415 | { |
5c44784c JM |
416 | if (errno == EIO) |
417 | { | |
6ce2ac0b | 418 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
419 | return 0; |
420 | } | |
421 | ||
6ce2ac0b | 422 | perror_with_name ("Couldn't read floating-point and SSE registers"); |
d4f3574e SS |
423 | } |
424 | ||
6ce2ac0b | 425 | supply_fpxregset (&fpxregs); |
5c44784c JM |
426 | return 1; |
427 | } | |
d4f3574e | 428 | |
04cd15b6 | 429 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 430 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 431 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 432 | |
5c44784c | 433 | static int |
6ce2ac0b | 434 | store_fpxregs (int tid, int regno) |
5c44784c | 435 | { |
6ce2ac0b | 436 | elf_fpxregset_t fpxregs; |
5c44784c | 437 | |
6ce2ac0b | 438 | if (! have_ptrace_getfpxregs) |
5c44784c | 439 | return 0; |
6ce2ac0b MK |
440 | |
441 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
442 | { |
443 | if (errno == EIO) | |
444 | { | |
445 | have_ptrace_getfpxregs = 0; | |
446 | return 0; | |
447 | } | |
448 | ||
449 | perror_with_name ("Couldn't read floating-point and SSE registers"); | |
450 | } | |
5c44784c | 451 | |
6ce2ac0b | 452 | fill_fpxregset (&fpxregs, regno); |
5c44784c | 453 | |
6ce2ac0b MK |
454 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
455 | perror_with_name ("Couldn't write floating-point and SSE registers"); | |
5c44784c JM |
456 | |
457 | return 1; | |
458 | } | |
459 | ||
04cd15b6 | 460 | /* Fill the XMM registers in the register array with dummy values. For |
5c44784c JM |
461 | cases where we don't have access to the XMM registers. I think |
462 | this is cleaner than printing a warning. For a cleaner solution, | |
463 | we should gdbarchify the i386 family. */ | |
04cd15b6 | 464 | |
5c44784c | 465 | static void |
04cd15b6 | 466 | dummy_sse_values (void) |
5c44784c | 467 | { |
7010ca0a | 468 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
5c44784c JM |
469 | /* C doesn't have a syntax for NaN's, so write it out as an array of |
470 | longs. */ | |
471 | static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; | |
472 | static long mxcsr = 0x1f80; | |
473 | int reg; | |
474 | ||
7010ca0a | 475 | for (reg = 0; reg < tdep->num_xmm_regs; reg++) |
23a6d369 | 476 | regcache_raw_supply (current_regcache, XMM0_REGNUM + reg, (char *) dummy); |
7010ca0a | 477 | if (tdep->num_xmm_regs > 0) |
23a6d369 | 478 | regcache_raw_supply (current_regcache, MXCSR_REGNUM, (char *) &mxcsr); |
d4f3574e SS |
479 | } |
480 | ||
5c44784c JM |
481 | #else |
482 | ||
f0373401 MK |
483 | static int fetch_fpxregs (int tid) { return 0; } |
484 | static int store_fpxregs (int tid, int regno) { return 0; } | |
04cd15b6 | 485 | static void dummy_sse_values (void) {} |
5c44784c | 486 | |
6ce2ac0b | 487 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 488 | \f |
6ce2ac0b | 489 | |
5c44784c | 490 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 491 | |
d5d65353 PS |
492 | /* Check if register REGNO in the child process is accessible. |
493 | If we are accessing registers directly via the U area, only the | |
494 | general-purpose registers are available. | |
495 | All registers should be accessible if we have GETREGS support. */ | |
496 | ||
497 | int | |
498 | cannot_fetch_register (int regno) | |
499 | { | |
ce556f85 MK |
500 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
501 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 | 502 | } |
ce556f85 | 503 | |
d5d65353 PS |
504 | int |
505 | cannot_store_register (int regno) | |
506 | { | |
ce556f85 MK |
507 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
508 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 PS |
509 | } |
510 | ||
04cd15b6 MK |
511 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
512 | this for all registers (including the floating point and SSE | |
513 | registers). */ | |
d4f3574e SS |
514 | |
515 | void | |
917317f4 | 516 | fetch_inferior_registers (int regno) |
d4f3574e | 517 | { |
ed9a39eb JM |
518 | int tid; |
519 | ||
f60300e7 MK |
520 | /* Use the old method of peeking around in `struct user' if the |
521 | GETREGS request isn't available. */ | |
ce556f85 | 522 | if (!have_ptrace_getregs) |
f60300e7 | 523 | { |
ce556f85 MK |
524 | int i; |
525 | ||
526 | for (i = 0; i < NUM_REGS; i++) | |
527 | if (regno == -1 || regno == i) | |
528 | fetch_register (i); | |
529 | ||
f60300e7 MK |
530 | return; |
531 | } | |
532 | ||
a4b6fc86 | 533 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
534 | tid = TIDGET (inferior_ptid); |
535 | if (tid == 0) | |
536 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 537 | |
6ce2ac0b | 538 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 539 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 540 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 541 | zero. */ |
5c44784c JM |
542 | if (regno == -1) |
543 | { | |
ed9a39eb | 544 | fetch_regs (tid); |
f60300e7 MK |
545 | |
546 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 547 | if (!have_ptrace_getregs) |
f60300e7 | 548 | { |
ce556f85 | 549 | fetch_inferior_registers (regno); |
f60300e7 MK |
550 | return; |
551 | } | |
552 | ||
6ce2ac0b | 553 | if (fetch_fpxregs (tid)) |
5c44784c | 554 | return; |
ed9a39eb | 555 | fetch_fpregs (tid); |
5c44784c JM |
556 | return; |
557 | } | |
d4f3574e | 558 | |
5c44784c JM |
559 | if (GETREGS_SUPPLIES (regno)) |
560 | { | |
ed9a39eb | 561 | fetch_regs (tid); |
5c44784c JM |
562 | return; |
563 | } | |
564 | ||
6ce2ac0b | 565 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 566 | { |
6ce2ac0b | 567 | if (fetch_fpxregs (tid)) |
5c44784c JM |
568 | return; |
569 | ||
570 | /* Either our processor or our kernel doesn't support the SSE | |
571 | registers, so read the FP registers in the traditional way, | |
572 | and fill the SSE registers with dummy values. It would be | |
573 | more graceful to handle differences in the register set using | |
574 | gdbarch. Until then, this will at least make things work | |
575 | plausibly. */ | |
ed9a39eb | 576 | fetch_fpregs (tid); |
5c44784c JM |
577 | return; |
578 | } | |
579 | ||
8e65ff28 AC |
580 | internal_error (__FILE__, __LINE__, |
581 | "Got request for bad register number %d.", regno); | |
d4f3574e SS |
582 | } |
583 | ||
04cd15b6 MK |
584 | /* Store register REGNO back into the child process. If REGNO is -1, |
585 | do this for all registers (including the floating point and SSE | |
586 | registers). */ | |
d4f3574e | 587 | void |
04cd15b6 | 588 | store_inferior_registers (int regno) |
d4f3574e | 589 | { |
ed9a39eb JM |
590 | int tid; |
591 | ||
f60300e7 MK |
592 | /* Use the old method of poking around in `struct user' if the |
593 | SETREGS request isn't available. */ | |
ce556f85 | 594 | if (!have_ptrace_getregs) |
f60300e7 | 595 | { |
ce556f85 MK |
596 | int i; |
597 | ||
598 | for (i = 0; i < NUM_REGS; i++) | |
599 | if (regno == -1 || regno == i) | |
600 | store_register (i); | |
601 | ||
f60300e7 MK |
602 | return; |
603 | } | |
604 | ||
a4b6fc86 | 605 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
606 | tid = TIDGET (inferior_ptid); |
607 | if (tid == 0) | |
608 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 609 | |
6ce2ac0b | 610 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 611 | transfers more registers in one system call. But remember that |
6ce2ac0b | 612 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
613 | if (regno == -1) |
614 | { | |
6ce2ac0b MK |
615 | store_regs (tid, regno); |
616 | if (store_fpxregs (tid, regno)) | |
5c44784c | 617 | return; |
6ce2ac0b | 618 | store_fpregs (tid, regno); |
5c44784c JM |
619 | return; |
620 | } | |
d4f3574e | 621 | |
5c44784c JM |
622 | if (GETREGS_SUPPLIES (regno)) |
623 | { | |
6ce2ac0b | 624 | store_regs (tid, regno); |
5c44784c JM |
625 | return; |
626 | } | |
627 | ||
6ce2ac0b | 628 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 629 | { |
6ce2ac0b | 630 | if (store_fpxregs (tid, regno)) |
5c44784c JM |
631 | return; |
632 | ||
633 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
634 | registers, so just write the FP registers in the traditional |
635 | way. */ | |
6ce2ac0b | 636 | store_fpregs (tid, regno); |
5c44784c JM |
637 | return; |
638 | } | |
639 | ||
8e65ff28 AC |
640 | internal_error (__FILE__, __LINE__, |
641 | "Got request to store bad register number %d.", regno); | |
d4f3574e | 642 | } |
de57eccd | 643 | \f |
6ce2ac0b | 644 | |
4ffc8466 MK |
645 | /* Support for debug registers. */ |
646 | ||
7bf0983e | 647 | static unsigned long |
84346e11 MK |
648 | i386_linux_dr_get (int regnum) |
649 | { | |
650 | int tid; | |
7bf0983e | 651 | unsigned long value; |
84346e11 MK |
652 | |
653 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
654 | multi-threaded processes here. For now, pretend there is just | |
655 | one thread. */ | |
39f77062 | 656 | tid = PIDGET (inferior_ptid); |
84346e11 | 657 | |
b9511b9a MK |
658 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
659 | ptrace call fails breaks debugging remote targets. The correct | |
660 | way to fix this is to add the hardware breakpoint and watchpoint | |
661 | stuff to the target vectore. For now, just return zero if the | |
662 | ptrace call fails. */ | |
84346e11 | 663 | errno = 0; |
ce556f85 | 664 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
665 | offsetof (struct user, u_debugreg[regnum]), 0); |
666 | if (errno != 0) | |
b9511b9a | 667 | #if 0 |
84346e11 | 668 | perror_with_name ("Couldn't read debug register"); |
b9511b9a MK |
669 | #else |
670 | return 0; | |
671 | #endif | |
84346e11 MK |
672 | |
673 | return value; | |
674 | } | |
675 | ||
676 | static void | |
7bf0983e | 677 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
678 | { |
679 | int tid; | |
680 | ||
681 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
682 | multi-threaded processes here. For now, pretend there is just | |
683 | one thread. */ | |
39f77062 | 684 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
685 | |
686 | errno = 0; | |
ce556f85 | 687 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
688 | offsetof (struct user, u_debugreg[regnum]), value); |
689 | if (errno != 0) | |
690 | perror_with_name ("Couldn't write debug register"); | |
691 | } | |
692 | ||
693 | void | |
7bf0983e | 694 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
695 | { |
696 | i386_linux_dr_set (DR_CONTROL, control); | |
697 | } | |
698 | ||
699 | void | |
700 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
701 | { | |
702 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
703 | ||
704 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
705 | } | |
706 | ||
707 | void | |
708 | i386_linux_dr_reset_addr (int regnum) | |
709 | { | |
710 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
711 | ||
712 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
713 | } | |
714 | ||
7bf0983e | 715 | unsigned long |
84346e11 MK |
716 | i386_linux_dr_get_status (void) |
717 | { | |
718 | return i386_linux_dr_get (DR_STATUS); | |
719 | } | |
720 | \f | |
721 | ||
5bca7895 MK |
722 | /* Called by libthread_db. Returns a pointer to the thread local |
723 | storage (or its descriptor). */ | |
724 | ||
725 | ps_err_e | |
726 | ps_get_thread_area (const struct ps_prochandle *ph, | |
727 | lwpid_t lwpid, int idx, void **base) | |
728 | { | |
729 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
730 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
731 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
732 | and a bunch of status bits. | |
733 | ||
734 | The values returned by this ptrace call should be part of the | |
735 | regcache buffer, and ps_get_thread_area should channel its | |
736 | request through the regcache. That way remote targets could | |
737 | provide the value using the remote protocol and not this direct | |
738 | call. | |
739 | ||
740 | Is this function needed? I'm guessing that the `base' is the | |
741 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 742 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
743 | descriptor is defined by the ABI. Anyway, given that |
744 | libthread_db calls this function without prompting (gdb | |
745 | requesting tls base) I guess it needs info in there anyway. */ | |
746 | unsigned int desc[4]; | |
747 | gdb_assert (sizeof (int) == 4); | |
748 | ||
749 | #ifndef PTRACE_GET_THREAD_AREA | |
750 | #define PTRACE_GET_THREAD_AREA 25 | |
751 | #endif | |
752 | ||
753 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
754 | (void *) idx, (unsigned long) &desc) < 0) | |
755 | return PS_ERR; | |
756 | ||
757 | *(int *)base = desc[1]; | |
758 | return PS_OK; | |
759 | } | |
760 | \f | |
761 | ||
a4b6fc86 | 762 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
763 | int $0x80 |
764 | or 0xcd 0x80. */ | |
765 | ||
766 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
767 | ||
768 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
769 | ||
770 | /* The system call number is stored in the %eax register. */ | |
771 | #define LINUX_SYSCALL_REGNUM 0 /* %eax */ | |
772 | ||
773 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
774 | system calls. */ | |
775 | ||
776 | #ifndef SYS_sigreturn | |
777 | #define SYS_sigreturn 0x77 | |
778 | #endif | |
779 | #ifndef SYS_rt_sigreturn | |
780 | #define SYS_rt_sigreturn 0xad | |
781 | #endif | |
782 | ||
783 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
784 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
785 | ||
786 | /* Resume execution of the inferior process. | |
787 | If STEP is nonzero, single-step it. | |
788 | If SIGNAL is nonzero, give it that signal. */ | |
789 | ||
790 | void | |
39f77062 | 791 | child_resume (ptid_t ptid, int step, enum target_signal signal) |
a6abb2c0 | 792 | { |
39f77062 KB |
793 | int pid = PIDGET (ptid); |
794 | ||
a6abb2c0 MK |
795 | int request = PTRACE_CONT; |
796 | ||
797 | if (pid == -1) | |
798 | /* Resume all threads. */ | |
799 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
800 | all threads" and "resume inferior_ptid" are the same. */ |
801 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
802 | |
803 | if (step) | |
804 | { | |
39f77062 | 805 | CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); |
a6abb2c0 MK |
806 | unsigned char buf[LINUX_SYSCALL_LEN]; |
807 | ||
808 | request = PTRACE_SINGLESTEP; | |
809 | ||
810 | /* Returning from a signal trampoline is done by calling a | |
811 | special system call (sigreturn or rt_sigreturn, see | |
812 | i386-linux-tdep.c for more information). This system call | |
813 | restores the registers that were saved when the signal was | |
814 | raised, including %eflags. That means that single-stepping | |
815 | won't work. Instead, we'll have to modify the signal context | |
816 | that's about to be restored, and set the trace flag there. */ | |
817 | ||
818 | /* First check if PC is at a system call. */ | |
1f602b35 | 819 | if (deprecated_read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
820 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
821 | { | |
39f77062 KB |
822 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, |
823 | pid_to_ptid (pid)); | |
a6abb2c0 MK |
824 | |
825 | /* Then check the system call number. */ | |
826 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
827 | { | |
c7f16359 | 828 | CORE_ADDR sp = read_register (I386_ESP_REGNUM); |
a6abb2c0 MK |
829 | CORE_ADDR addr = sp; |
830 | unsigned long int eflags; | |
7bf0983e | 831 | |
a6abb2c0 MK |
832 | if (syscall == SYS_rt_sigreturn) |
833 | addr = read_memory_integer (sp + 8, 4) + 20; | |
834 | ||
835 | /* Set the trace flag in the context that's about to be | |
836 | restored. */ | |
837 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
838 | read_memory (addr, (char *) &eflags, 4); | |
839 | eflags |= 0x0100; | |
840 | write_memory (addr, (char *) &eflags, 4); | |
841 | } | |
842 | } | |
843 | } | |
844 | ||
845 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
846 | perror_with_name ("ptrace"); | |
847 | } | |
4de4c07c DJ |
848 | |
849 | void | |
850 | child_post_startup_inferior (ptid_t ptid) | |
851 | { | |
852 | i386_cleanup_dregs (); | |
853 | linux_child_post_startup_inferior (ptid); | |
854 | } |