Commit | Line | Data |
---|---|---|
a4b6fc86 AC |
1 | /* Native-dependent code for GNU/Linux x86. |
2 | ||
975aec09 | 3 | Copyright 1999, 2000, 2001, 2002 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" |
d4f3574e | 26 | |
84346e11 | 27 | #include "gdb_assert.h" |
309367d4 | 28 | #include "gdb_string.h" |
d4f3574e SS |
29 | #include <sys/ptrace.h> |
30 | #include <sys/user.h> | |
31 | #include <sys/procfs.h> | |
32 | ||
33 | #ifdef HAVE_SYS_REG_H | |
34 | #include <sys/reg.h> | |
35 | #endif | |
36 | ||
ce556f85 MK |
37 | #ifndef ORIG_EAX |
38 | #define ORIG_EAX -1 | |
39 | #endif | |
40 | ||
84346e11 MK |
41 | #ifdef HAVE_SYS_DEBUGREG_H |
42 | #include <sys/debugreg.h> | |
43 | #endif | |
44 | ||
45 | #ifndef DR_FIRSTADDR | |
46 | #define DR_FIRSTADDR 0 | |
47 | #endif | |
48 | ||
49 | #ifndef DR_LASTADDR | |
50 | #define DR_LASTADDR 3 | |
51 | #endif | |
52 | ||
53 | #ifndef DR_STATUS | |
54 | #define DR_STATUS 6 | |
55 | #endif | |
56 | ||
57 | #ifndef DR_CONTROL | |
58 | #define DR_CONTROL 7 | |
59 | #endif | |
60 | ||
6ce2ac0b | 61 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
62 | #include "gregset.h" |
63 | ||
6ce2ac0b | 64 | /* Prototypes for i387_supply_fsave etc. */ |
e750d25e | 65 | #include "i387-tdep.h" |
6ce2ac0b | 66 | |
c3833324 MS |
67 | /* Defines for XMM0_REGNUM etc. */ |
68 | #include "i386-tdep.h" | |
69 | ||
5179e78f AC |
70 | /* Defines I386_LINUX_ORIG_EAX_REGNUM. */ |
71 | #include "i386-linux-tdep.h" | |
72 | ||
756ed206 MK |
73 | /* Prototypes for local functions. */ |
74 | static void dummy_sse_values (void); | |
75 | ||
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. */ | |
110 | #define GETREGS_SUPPLIES(regno) \ | |
3fb1c838 | 111 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
5c44784c JM |
112 | #define GETFPREGS_SUPPLIES(regno) \ |
113 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) | |
6ce2ac0b | 114 | #define GETFPXREGS_SUPPLIES(regno) \ |
5c44784c JM |
115 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
116 | ||
f60300e7 MK |
117 | /* Does the current host support the GETREGS request? */ |
118 | int have_ptrace_getregs = | |
119 | #ifdef HAVE_PTRACE_GETREGS | |
120 | 1 | |
121 | #else | |
122 | 0 | |
123 | #endif | |
124 | ; | |
125 | ||
6ce2ac0b | 126 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
127 | file may or may not define it, and even if it is defined, the |
128 | kernel will return EIO if it's running on a pre-SSE processor. | |
129 | ||
130 | My instinct is to attach this to some architecture- or | |
131 | target-specific data structure, but really, a particular GDB | |
132 | process can only run on top of one kernel at a time. So it's okay | |
133 | for this to be a simple variable. */ | |
6ce2ac0b MK |
134 | int have_ptrace_getfpxregs = |
135 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
136 | 1 |
137 | #else | |
138 | 0 | |
139 | #endif | |
140 | ; | |
f60300e7 | 141 | \f |
6ce2ac0b | 142 | |
84346e11 MK |
143 | /* Support for the user struct. */ |
144 | ||
145 | /* Return the address of register REGNUM. BLOCKEND is the value of | |
146 | u.u_ar0, which should point to the registers. */ | |
147 | ||
148 | CORE_ADDR | |
149 | register_u_addr (CORE_ADDR blockend, int regnum) | |
150 | { | |
151 | return (blockend + 4 * regmap[regnum]); | |
152 | } | |
153 | ||
154 | /* Return the size of the user struct. */ | |
155 | ||
156 | int | |
157 | kernel_u_size (void) | |
158 | { | |
159 | return (sizeof (struct user)); | |
160 | } | |
161 | \f | |
162 | ||
ce556f85 | 163 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
164 | |
165 | /* Fetch one register. */ | |
166 | ||
167 | static void | |
fba45db2 | 168 | fetch_register (int regno) |
f60300e7 | 169 | { |
f60300e7 | 170 | int tid; |
ce556f85 | 171 | int val; |
f60300e7 | 172 | |
ce556f85 MK |
173 | gdb_assert (!have_ptrace_getregs); |
174 | if (cannot_fetch_register (regno)) | |
f60300e7 | 175 | { |
ce556f85 | 176 | supply_register (regno, NULL); |
f60300e7 MK |
177 | return; |
178 | } | |
179 | ||
ce556f85 | 180 | /* GNU/Linux LWP ID's are process ID's. */ |
39f77062 | 181 | if ((tid = TIDGET (inferior_ptid)) == 0) |
ce556f85 | 182 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 183 | |
ce556f85 MK |
184 | errno = 0; |
185 | val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0); | |
186 | if (errno != 0) | |
187 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno), | |
188 | regno, safe_strerror (errno)); | |
f60300e7 | 189 | |
ce556f85 | 190 | supply_register (regno, &val); |
f60300e7 MK |
191 | } |
192 | ||
f60300e7 MK |
193 | /* Store one register. */ |
194 | ||
195 | static void | |
fba45db2 | 196 | store_register (int regno) |
f60300e7 | 197 | { |
f60300e7 | 198 | int tid; |
ce556f85 | 199 | int val; |
f60300e7 | 200 | |
ce556f85 MK |
201 | gdb_assert (!have_ptrace_getregs); |
202 | if (cannot_store_register (regno)) | |
203 | return; | |
f60300e7 | 204 | |
ce556f85 | 205 | /* GNU/Linux LWP ID's are process ID's. */ |
39f77062 | 206 | if ((tid = TIDGET (inferior_ptid)) == 0) |
ce556f85 | 207 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
f60300e7 | 208 | |
ce556f85 MK |
209 | errno = 0; |
210 | regcache_collect (regno, &val); | |
211 | ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val); | |
212 | if (errno != 0) | |
213 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno), | |
214 | regno, safe_strerror (errno)); | |
f60300e7 | 215 | } |
5c44784c | 216 | \f |
6ce2ac0b | 217 | |
04cd15b6 MK |
218 | /* Transfering the general-purpose registers between GDB, inferiors |
219 | and core files. */ | |
220 | ||
ad2a4d09 | 221 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 222 | in *GREGSETP. */ |
5c44784c | 223 | |
d4f3574e | 224 | void |
04cd15b6 | 225 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 226 | { |
04cd15b6 | 227 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
6ce2ac0b | 228 | int i; |
d4f3574e | 229 | |
98df6387 | 230 | for (i = 0; i < I386_NUM_GREGS; i++) |
6ce2ac0b | 231 | supply_register (i, (char *) (regp + regmap[i])); |
3fb1c838 | 232 | |
82ea117a MK |
233 | if (I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) |
234 | supply_register (I386_LINUX_ORIG_EAX_REGNUM, (char *) (regp + ORIG_EAX)); | |
917317f4 JM |
235 | } |
236 | ||
04cd15b6 MK |
237 | /* Fill register REGNO (if it is a general-purpose register) in |
238 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
239 | do this for all registers. */ | |
6ce2ac0b | 240 | |
917317f4 | 241 | void |
04cd15b6 | 242 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 | 243 | { |
6ce2ac0b MK |
244 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
245 | int i; | |
04cd15b6 | 246 | |
98df6387 | 247 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 248 | if (regno == -1 || regno == i) |
8a406745 | 249 | regcache_collect (i, regp + regmap[i]); |
3fb1c838 | 250 | |
82ea117a MK |
251 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
252 | && I386_LINUX_ORIG_EAX_REGNUM < NUM_REGS) | |
76fb44f4 | 253 | regcache_collect (I386_LINUX_ORIG_EAX_REGNUM, regp + ORIG_EAX); |
d4f3574e SS |
254 | } |
255 | ||
f60300e7 MK |
256 | #ifdef HAVE_PTRACE_GETREGS |
257 | ||
04cd15b6 MK |
258 | /* Fetch all general-purpose registers from process/thread TID and |
259 | store their values in GDB's register array. */ | |
d4f3574e | 260 | |
5c44784c | 261 | static void |
ed9a39eb | 262 | fetch_regs (int tid) |
5c44784c | 263 | { |
04cd15b6 | 264 | elf_gregset_t regs; |
5c44784c | 265 | |
6ce2ac0b | 266 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 267 | { |
f60300e7 MK |
268 | if (errno == EIO) |
269 | { | |
270 | /* The kernel we're running on doesn't support the GETREGS | |
271 | request. Reset `have_ptrace_getregs'. */ | |
272 | have_ptrace_getregs = 0; | |
273 | return; | |
274 | } | |
275 | ||
6ce2ac0b | 276 | perror_with_name ("Couldn't get registers"); |
5c44784c JM |
277 | } |
278 | ||
04cd15b6 | 279 | supply_gregset (®s); |
5c44784c JM |
280 | } |
281 | ||
04cd15b6 MK |
282 | /* Store all valid general-purpose registers in GDB's register array |
283 | into the process/thread specified by TID. */ | |
5c44784c | 284 | |
5c44784c | 285 | static void |
6ce2ac0b | 286 | store_regs (int tid, int regno) |
5c44784c | 287 | { |
04cd15b6 | 288 | elf_gregset_t regs; |
5c44784c | 289 | |
6ce2ac0b MK |
290 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
291 | perror_with_name ("Couldn't get registers"); | |
5c44784c | 292 | |
6ce2ac0b MK |
293 | fill_gregset (®s, regno); |
294 | ||
295 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
296 | perror_with_name ("Couldn't write registers"); | |
5c44784c JM |
297 | } |
298 | ||
f60300e7 MK |
299 | #else |
300 | ||
301 | static void fetch_regs (int tid) {} | |
6ce2ac0b | 302 | static void store_regs (int tid, int regno) {} |
f60300e7 MK |
303 | |
304 | #endif | |
5c44784c | 305 | \f |
5c44784c | 306 | |
6ce2ac0b | 307 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 308 | |
04cd15b6 | 309 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 310 | *FPREGSETP. */ |
04cd15b6 | 311 | |
d4f3574e | 312 | void |
04cd15b6 | 313 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 314 | { |
6ce2ac0b | 315 | i387_supply_fsave ((char *) fpregsetp); |
756ed206 | 316 | dummy_sse_values (); |
917317f4 | 317 | } |
d4f3574e | 318 | |
04cd15b6 MK |
319 | /* Fill register REGNO (if it is a floating-point register) in |
320 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
321 | do this for all registers. */ | |
917317f4 JM |
322 | |
323 | void | |
04cd15b6 | 324 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 325 | { |
6ce2ac0b | 326 | i387_fill_fsave ((char *) fpregsetp, regno); |
d4f3574e SS |
327 | } |
328 | ||
f60300e7 MK |
329 | #ifdef HAVE_PTRACE_GETREGS |
330 | ||
04cd15b6 MK |
331 | /* Fetch all floating-point registers from process/thread TID and store |
332 | thier values in GDB's register array. */ | |
917317f4 | 333 | |
d4f3574e | 334 | static void |
ed9a39eb | 335 | fetch_fpregs (int tid) |
d4f3574e | 336 | { |
04cd15b6 | 337 | elf_fpregset_t fpregs; |
d4f3574e | 338 | |
6ce2ac0b MK |
339 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
340 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 341 | |
04cd15b6 | 342 | supply_fpregset (&fpregs); |
d4f3574e SS |
343 | } |
344 | ||
04cd15b6 MK |
345 | /* Store all valid floating-point registers in GDB's register array |
346 | into the process/thread specified by TID. */ | |
d4f3574e | 347 | |
d4f3574e | 348 | static void |
6ce2ac0b | 349 | store_fpregs (int tid, int regno) |
d4f3574e | 350 | { |
04cd15b6 | 351 | elf_fpregset_t fpregs; |
d4f3574e | 352 | |
6ce2ac0b MK |
353 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
354 | perror_with_name ("Couldn't get floating point status"); | |
d4f3574e | 355 | |
6ce2ac0b | 356 | fill_fpregset (&fpregs, regno); |
d4f3574e | 357 | |
6ce2ac0b MK |
358 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
359 | perror_with_name ("Couldn't write floating point status"); | |
d4f3574e SS |
360 | } |
361 | ||
f60300e7 MK |
362 | #else |
363 | ||
364 | static void fetch_fpregs (int tid) {} | |
6ce2ac0b | 365 | static void store_fpregs (int tid, int regno) {} |
f60300e7 MK |
366 | |
367 | #endif | |
5c44784c | 368 | \f |
d4f3574e | 369 | |
6ce2ac0b | 370 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 371 | |
6ce2ac0b | 372 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
373 | |
374 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 375 | values in *FPXREGSETP. */ |
04cd15b6 | 376 | |
975aec09 | 377 | void |
6ce2ac0b | 378 | supply_fpxregset (elf_fpxregset_t *fpxregsetp) |
d4f3574e | 379 | { |
6ce2ac0b | 380 | i387_supply_fxsave ((char *) fpxregsetp); |
d4f3574e SS |
381 | } |
382 | ||
6ce2ac0b MK |
383 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
384 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
385 | -1, do this for all registers. */ | |
d4f3574e | 386 | |
975aec09 | 387 | void |
6ce2ac0b | 388 | fill_fpxregset (elf_fpxregset_t *fpxregsetp, int regno) |
d4f3574e | 389 | { |
6ce2ac0b | 390 | i387_fill_fxsave ((char *) fpxregsetp, regno); |
5c44784c JM |
391 | } |
392 | ||
6ce2ac0b | 393 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
394 | process/thread TID and store their values in GDB's register array. |
395 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 396 | |
5c44784c | 397 | static int |
6ce2ac0b | 398 | fetch_fpxregs (int tid) |
5c44784c | 399 | { |
6ce2ac0b | 400 | elf_fpxregset_t fpxregs; |
5c44784c | 401 | |
6ce2ac0b | 402 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
403 | return 0; |
404 | ||
6ce2ac0b | 405 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 406 | { |
5c44784c JM |
407 | if (errno == EIO) |
408 | { | |
6ce2ac0b | 409 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
410 | return 0; |
411 | } | |
412 | ||
6ce2ac0b | 413 | perror_with_name ("Couldn't read floating-point and SSE registers"); |
d4f3574e SS |
414 | } |
415 | ||
6ce2ac0b | 416 | supply_fpxregset (&fpxregs); |
5c44784c JM |
417 | return 1; |
418 | } | |
d4f3574e | 419 | |
04cd15b6 | 420 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 421 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 422 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 423 | |
5c44784c | 424 | static int |
6ce2ac0b | 425 | store_fpxregs (int tid, int regno) |
5c44784c | 426 | { |
6ce2ac0b | 427 | elf_fpxregset_t fpxregs; |
5c44784c | 428 | |
6ce2ac0b | 429 | if (! have_ptrace_getfpxregs) |
5c44784c | 430 | return 0; |
6ce2ac0b MK |
431 | |
432 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
433 | { |
434 | if (errno == EIO) | |
435 | { | |
436 | have_ptrace_getfpxregs = 0; | |
437 | return 0; | |
438 | } | |
439 | ||
440 | perror_with_name ("Couldn't read floating-point and SSE registers"); | |
441 | } | |
5c44784c | 442 | |
6ce2ac0b | 443 | fill_fpxregset (&fpxregs, regno); |
5c44784c | 444 | |
6ce2ac0b MK |
445 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
446 | perror_with_name ("Couldn't write floating-point and SSE registers"); | |
5c44784c JM |
447 | |
448 | return 1; | |
449 | } | |
450 | ||
04cd15b6 | 451 | /* Fill the XMM registers in the register array with dummy values. For |
5c44784c JM |
452 | cases where we don't have access to the XMM registers. I think |
453 | this is cleaner than printing a warning. For a cleaner solution, | |
454 | we should gdbarchify the i386 family. */ | |
04cd15b6 | 455 | |
5c44784c | 456 | static void |
04cd15b6 | 457 | dummy_sse_values (void) |
5c44784c | 458 | { |
7010ca0a | 459 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
5c44784c JM |
460 | /* C doesn't have a syntax for NaN's, so write it out as an array of |
461 | longs. */ | |
462 | static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; | |
463 | static long mxcsr = 0x1f80; | |
464 | int reg; | |
465 | ||
7010ca0a | 466 | for (reg = 0; reg < tdep->num_xmm_regs; reg++) |
5c44784c | 467 | supply_register (XMM0_REGNUM + reg, (char *) dummy); |
7010ca0a MK |
468 | if (tdep->num_xmm_regs > 0) |
469 | supply_register (MXCSR_REGNUM, (char *) &mxcsr); | |
d4f3574e SS |
470 | } |
471 | ||
5c44784c JM |
472 | #else |
473 | ||
f0373401 MK |
474 | static int fetch_fpxregs (int tid) { return 0; } |
475 | static int store_fpxregs (int tid, int regno) { return 0; } | |
04cd15b6 | 476 | static void dummy_sse_values (void) {} |
5c44784c | 477 | |
6ce2ac0b | 478 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 479 | \f |
6ce2ac0b | 480 | |
5c44784c | 481 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 482 | |
d5d65353 PS |
483 | /* Check if register REGNO in the child process is accessible. |
484 | If we are accessing registers directly via the U area, only the | |
485 | general-purpose registers are available. | |
486 | All registers should be accessible if we have GETREGS support. */ | |
487 | ||
488 | int | |
489 | cannot_fetch_register (int regno) | |
490 | { | |
ce556f85 MK |
491 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
492 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 | 493 | } |
ce556f85 | 494 | |
d5d65353 PS |
495 | int |
496 | cannot_store_register (int regno) | |
497 | { | |
ce556f85 MK |
498 | gdb_assert (regno >= 0 && regno < NUM_REGS); |
499 | return (!have_ptrace_getregs && regmap[regno] == -1); | |
d5d65353 PS |
500 | } |
501 | ||
04cd15b6 MK |
502 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
503 | this for all registers (including the floating point and SSE | |
504 | registers). */ | |
d4f3574e SS |
505 | |
506 | void | |
917317f4 | 507 | fetch_inferior_registers (int regno) |
d4f3574e | 508 | { |
ed9a39eb JM |
509 | int tid; |
510 | ||
f60300e7 MK |
511 | /* Use the old method of peeking around in `struct user' if the |
512 | GETREGS request isn't available. */ | |
ce556f85 | 513 | if (!have_ptrace_getregs) |
f60300e7 | 514 | { |
ce556f85 MK |
515 | int i; |
516 | ||
517 | for (i = 0; i < NUM_REGS; i++) | |
518 | if (regno == -1 || regno == i) | |
519 | fetch_register (i); | |
520 | ||
f60300e7 MK |
521 | return; |
522 | } | |
523 | ||
a4b6fc86 | 524 | /* GNU/Linux LWP ID's are process ID's. */ |
39f77062 KB |
525 | if ((tid = TIDGET (inferior_ptid)) == 0) |
526 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 527 | |
6ce2ac0b | 528 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 529 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 530 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 531 | zero. */ |
5c44784c JM |
532 | if (regno == -1) |
533 | { | |
ed9a39eb | 534 | fetch_regs (tid); |
f60300e7 MK |
535 | |
536 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 537 | if (!have_ptrace_getregs) |
f60300e7 | 538 | { |
ce556f85 | 539 | fetch_inferior_registers (regno); |
f60300e7 MK |
540 | return; |
541 | } | |
542 | ||
6ce2ac0b | 543 | if (fetch_fpxregs (tid)) |
5c44784c | 544 | return; |
ed9a39eb | 545 | fetch_fpregs (tid); |
5c44784c JM |
546 | return; |
547 | } | |
d4f3574e | 548 | |
5c44784c JM |
549 | if (GETREGS_SUPPLIES (regno)) |
550 | { | |
ed9a39eb | 551 | fetch_regs (tid); |
5c44784c JM |
552 | return; |
553 | } | |
554 | ||
6ce2ac0b | 555 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 556 | { |
6ce2ac0b | 557 | if (fetch_fpxregs (tid)) |
5c44784c JM |
558 | return; |
559 | ||
560 | /* Either our processor or our kernel doesn't support the SSE | |
561 | registers, so read the FP registers in the traditional way, | |
562 | and fill the SSE registers with dummy values. It would be | |
563 | more graceful to handle differences in the register set using | |
564 | gdbarch. Until then, this will at least make things work | |
565 | plausibly. */ | |
ed9a39eb | 566 | fetch_fpregs (tid); |
5c44784c JM |
567 | return; |
568 | } | |
569 | ||
8e65ff28 AC |
570 | internal_error (__FILE__, __LINE__, |
571 | "Got request for bad register number %d.", regno); | |
d4f3574e SS |
572 | } |
573 | ||
04cd15b6 MK |
574 | /* Store register REGNO back into the child process. If REGNO is -1, |
575 | do this for all registers (including the floating point and SSE | |
576 | registers). */ | |
d4f3574e | 577 | void |
04cd15b6 | 578 | store_inferior_registers (int regno) |
d4f3574e | 579 | { |
ed9a39eb JM |
580 | int tid; |
581 | ||
f60300e7 MK |
582 | /* Use the old method of poking around in `struct user' if the |
583 | SETREGS request isn't available. */ | |
ce556f85 | 584 | if (!have_ptrace_getregs) |
f60300e7 | 585 | { |
ce556f85 MK |
586 | int i; |
587 | ||
588 | for (i = 0; i < NUM_REGS; i++) | |
589 | if (regno == -1 || regno == i) | |
590 | store_register (i); | |
591 | ||
f60300e7 MK |
592 | return; |
593 | } | |
594 | ||
a4b6fc86 | 595 | /* GNU/Linux LWP ID's are process ID's. */ |
39f77062 KB |
596 | if ((tid = TIDGET (inferior_ptid)) == 0) |
597 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 598 | |
6ce2ac0b | 599 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 600 | transfers more registers in one system call. But remember that |
6ce2ac0b | 601 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
602 | if (regno == -1) |
603 | { | |
6ce2ac0b MK |
604 | store_regs (tid, regno); |
605 | if (store_fpxregs (tid, regno)) | |
5c44784c | 606 | return; |
6ce2ac0b | 607 | store_fpregs (tid, regno); |
5c44784c JM |
608 | return; |
609 | } | |
d4f3574e | 610 | |
5c44784c JM |
611 | if (GETREGS_SUPPLIES (regno)) |
612 | { | |
6ce2ac0b | 613 | store_regs (tid, regno); |
5c44784c JM |
614 | return; |
615 | } | |
616 | ||
6ce2ac0b | 617 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 618 | { |
6ce2ac0b | 619 | if (store_fpxregs (tid, regno)) |
5c44784c JM |
620 | return; |
621 | ||
622 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
623 | registers, so just write the FP registers in the traditional |
624 | way. */ | |
6ce2ac0b | 625 | store_fpregs (tid, regno); |
5c44784c JM |
626 | return; |
627 | } | |
628 | ||
8e65ff28 AC |
629 | internal_error (__FILE__, __LINE__, |
630 | "Got request to store bad register number %d.", regno); | |
d4f3574e | 631 | } |
de57eccd | 632 | \f |
6ce2ac0b | 633 | |
7bf0983e | 634 | static unsigned long |
84346e11 MK |
635 | i386_linux_dr_get (int regnum) |
636 | { | |
637 | int tid; | |
7bf0983e | 638 | unsigned long value; |
84346e11 MK |
639 | |
640 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
641 | multi-threaded processes here. For now, pretend there is just | |
642 | one thread. */ | |
39f77062 | 643 | tid = PIDGET (inferior_ptid); |
84346e11 | 644 | |
b9511b9a MK |
645 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
646 | ptrace call fails breaks debugging remote targets. The correct | |
647 | way to fix this is to add the hardware breakpoint and watchpoint | |
648 | stuff to the target vectore. For now, just return zero if the | |
649 | ptrace call fails. */ | |
84346e11 | 650 | errno = 0; |
ce556f85 | 651 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
652 | offsetof (struct user, u_debugreg[regnum]), 0); |
653 | if (errno != 0) | |
b9511b9a | 654 | #if 0 |
84346e11 | 655 | perror_with_name ("Couldn't read debug register"); |
b9511b9a MK |
656 | #else |
657 | return 0; | |
658 | #endif | |
84346e11 MK |
659 | |
660 | return value; | |
661 | } | |
662 | ||
663 | static void | |
7bf0983e | 664 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
665 | { |
666 | int tid; | |
667 | ||
668 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
669 | multi-threaded processes here. For now, pretend there is just | |
670 | one thread. */ | |
39f77062 | 671 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
672 | |
673 | errno = 0; | |
ce556f85 | 674 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
675 | offsetof (struct user, u_debugreg[regnum]), value); |
676 | if (errno != 0) | |
677 | perror_with_name ("Couldn't write debug register"); | |
678 | } | |
679 | ||
680 | void | |
7bf0983e | 681 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
682 | { |
683 | i386_linux_dr_set (DR_CONTROL, control); | |
684 | } | |
685 | ||
686 | void | |
687 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
688 | { | |
689 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
690 | ||
691 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
692 | } | |
693 | ||
694 | void | |
695 | i386_linux_dr_reset_addr (int regnum) | |
696 | { | |
697 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
698 | ||
699 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
700 | } | |
701 | ||
7bf0983e | 702 | unsigned long |
84346e11 MK |
703 | i386_linux_dr_get_status (void) |
704 | { | |
705 | return i386_linux_dr_get (DR_STATUS); | |
706 | } | |
707 | \f | |
708 | ||
de57eccd JM |
709 | /* Interpreting register set info found in core files. */ |
710 | ||
711 | /* Provide registers to GDB from a core file. | |
712 | ||
713 | (We can't use the generic version of this function in | |
a4b6fc86 | 714 | core-regset.c, because GNU/Linux has *three* different kinds of |
de57eccd | 715 | register set notes. core-regset.c would have to call |
6ce2ac0b | 716 | supply_fpxregset, which most platforms don't have.) |
de57eccd JM |
717 | |
718 | CORE_REG_SECT points to an array of bytes, which are the contents | |
719 | of a `note' from a core file which BFD thinks might contain | |
720 | register contents. CORE_REG_SIZE is its size. | |
721 | ||
722 | WHICH says which register set corelow suspects this is: | |
04cd15b6 MK |
723 | 0 --- the general-purpose register set, in elf_gregset_t format |
724 | 2 --- the floating-point register set, in elf_fpregset_t format | |
6ce2ac0b | 725 | 3 --- the extended floating-point register set, in elf_fpxregset_t format |
04cd15b6 | 726 | |
a4b6fc86 | 727 | REG_ADDR isn't used on GNU/Linux. */ |
de57eccd | 728 | |
de57eccd | 729 | static void |
04cd15b6 MK |
730 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
731 | int which, CORE_ADDR reg_addr) | |
de57eccd | 732 | { |
04cd15b6 MK |
733 | elf_gregset_t gregset; |
734 | elf_fpregset_t fpregset; | |
de57eccd JM |
735 | |
736 | switch (which) | |
737 | { | |
738 | case 0: | |
739 | if (core_reg_size != sizeof (gregset)) | |
04cd15b6 | 740 | warning ("Wrong size gregset in core file."); |
de57eccd JM |
741 | else |
742 | { | |
743 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); | |
744 | supply_gregset (&gregset); | |
745 | } | |
746 | break; | |
747 | ||
748 | case 2: | |
749 | if (core_reg_size != sizeof (fpregset)) | |
04cd15b6 | 750 | warning ("Wrong size fpregset in core file."); |
de57eccd JM |
751 | else |
752 | { | |
753 | memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); | |
754 | supply_fpregset (&fpregset); | |
755 | } | |
756 | break; | |
757 | ||
6ce2ac0b | 758 | #ifdef HAVE_PTRACE_GETFPXREGS |
de57eccd | 759 | { |
6ce2ac0b | 760 | elf_fpxregset_t fpxregset; |
04cd15b6 | 761 | |
de57eccd | 762 | case 3: |
6ce2ac0b MK |
763 | if (core_reg_size != sizeof (fpxregset)) |
764 | warning ("Wrong size fpxregset in core file."); | |
de57eccd JM |
765 | else |
766 | { | |
6ce2ac0b MK |
767 | memcpy (&fpxregset, core_reg_sect, sizeof (fpxregset)); |
768 | supply_fpxregset (&fpxregset); | |
de57eccd JM |
769 | } |
770 | break; | |
771 | } | |
772 | #endif | |
773 | ||
774 | default: | |
775 | /* We've covered all the kinds of registers we know about here, | |
776 | so this must be something we wouldn't know what to do with | |
777 | anyway. Just ignore it. */ | |
778 | break; | |
779 | } | |
780 | } | |
a6abb2c0 | 781 | \f |
6ce2ac0b | 782 | |
a4b6fc86 | 783 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
784 | int $0x80 |
785 | or 0xcd 0x80. */ | |
786 | ||
787 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
788 | ||
789 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
790 | ||
791 | /* The system call number is stored in the %eax register. */ | |
792 | #define LINUX_SYSCALL_REGNUM 0 /* %eax */ | |
793 | ||
794 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
795 | system calls. */ | |
796 | ||
797 | #ifndef SYS_sigreturn | |
798 | #define SYS_sigreturn 0x77 | |
799 | #endif | |
800 | #ifndef SYS_rt_sigreturn | |
801 | #define SYS_rt_sigreturn 0xad | |
802 | #endif | |
803 | ||
804 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
805 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
806 | ||
807 | /* Resume execution of the inferior process. | |
808 | If STEP is nonzero, single-step it. | |
809 | If SIGNAL is nonzero, give it that signal. */ | |
810 | ||
811 | void | |
39f77062 | 812 | child_resume (ptid_t ptid, int step, enum target_signal signal) |
a6abb2c0 | 813 | { |
39f77062 KB |
814 | int pid = PIDGET (ptid); |
815 | ||
a6abb2c0 MK |
816 | int request = PTRACE_CONT; |
817 | ||
818 | if (pid == -1) | |
819 | /* Resume all threads. */ | |
820 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
821 | all threads" and "resume inferior_ptid" are the same. */ |
822 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
823 | |
824 | if (step) | |
825 | { | |
39f77062 | 826 | CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); |
a6abb2c0 MK |
827 | unsigned char buf[LINUX_SYSCALL_LEN]; |
828 | ||
829 | request = PTRACE_SINGLESTEP; | |
830 | ||
831 | /* Returning from a signal trampoline is done by calling a | |
832 | special system call (sigreturn or rt_sigreturn, see | |
833 | i386-linux-tdep.c for more information). This system call | |
834 | restores the registers that were saved when the signal was | |
835 | raised, including %eflags. That means that single-stepping | |
836 | won't work. Instead, we'll have to modify the signal context | |
837 | that's about to be restored, and set the trace flag there. */ | |
838 | ||
839 | /* First check if PC is at a system call. */ | |
840 | if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 | |
841 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) | |
842 | { | |
39f77062 KB |
843 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, |
844 | pid_to_ptid (pid)); | |
a6abb2c0 MK |
845 | |
846 | /* Then check the system call number. */ | |
847 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
848 | { | |
849 | CORE_ADDR sp = read_register (SP_REGNUM); | |
850 | CORE_ADDR addr = sp; | |
851 | unsigned long int eflags; | |
7bf0983e | 852 | |
a6abb2c0 MK |
853 | if (syscall == SYS_rt_sigreturn) |
854 | addr = read_memory_integer (sp + 8, 4) + 20; | |
855 | ||
856 | /* Set the trace flag in the context that's about to be | |
857 | restored. */ | |
858 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
859 | read_memory (addr, (char *) &eflags, 4); | |
860 | eflags |= 0x0100; | |
861 | write_memory (addr, (char *) &eflags, 4); | |
862 | } | |
863 | } | |
864 | } | |
865 | ||
866 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
867 | perror_with_name ("ptrace"); | |
868 | } | |
5c44784c | 869 | \f |
6ce2ac0b | 870 | |
a4b6fc86 AC |
871 | /* Register that we are able to handle GNU/Linux ELF core file |
872 | formats. */ | |
04cd15b6 MK |
873 | |
874 | static struct core_fns linux_elf_core_fns = | |
875 | { | |
876 | bfd_target_elf_flavour, /* core_flavour */ | |
877 | default_check_format, /* check_format */ | |
878 | default_core_sniffer, /* core_sniffer */ | |
879 | fetch_core_registers, /* core_read_registers */ | |
880 | NULL /* next */ | |
881 | }; | |
de57eccd JM |
882 | |
883 | void | |
fba45db2 | 884 | _initialize_i386_linux_nat (void) |
de57eccd | 885 | { |
04cd15b6 | 886 | add_core_fns (&linux_elf_core_fns); |
de57eccd | 887 | } |