Commit | Line | Data |
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0a30fbc4 | 1 | /* Register support routines for the remote server for GDB. |
61baf725 | 2 | Copyright (C) 2001-2017 Free Software Foundation, Inc. |
0a30fbc4 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
0a30fbc4 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0a30fbc4 DJ |
18 | |
19 | #include "server.h" | |
20 | #include "regdef.h" | |
623b6bdf | 21 | #include "gdbthread.h" |
3aee8918 | 22 | #include "tdesc.h" |
9c3d6531 | 23 | #include "rsp-low.h" |
fa593d66 PA |
24 | #ifndef IN_PROCESS_AGENT |
25 | ||
442ea881 PA |
26 | struct regcache * |
27 | get_thread_regcache (struct thread_info *thread, int fetch) | |
c04a1aa8 | 28 | { |
442ea881 | 29 | struct regcache *regcache; |
c04a1aa8 | 30 | |
6afd337d | 31 | regcache = thread_regcache_data (thread); |
c04a1aa8 | 32 | |
3aee8918 PA |
33 | /* Threads' regcaches are created lazily, because biarch targets add |
34 | the main thread/lwp before seeing it stop for the first time, and | |
35 | it is only after the target sees the thread stop for the first | |
36 | time that the target has a chance of determining the process's | |
37 | architecture. IOW, when we first add the process's main thread | |
38 | we don't know which architecture/tdesc its regcache should | |
39 | have. */ | |
c04a1aa8 | 40 | if (regcache == NULL) |
3aee8918 PA |
41 | { |
42 | struct process_info *proc = get_thread_process (thread); | |
43 | ||
38e08fca | 44 | gdb_assert (proc->tdesc != NULL); |
3aee8918 PA |
45 | |
46 | regcache = new_register_cache (proc->tdesc); | |
6afd337d | 47 | set_thread_regcache_data (thread, regcache); |
3aee8918 | 48 | } |
c04a1aa8 | 49 | |
0d62e5e8 DJ |
50 | if (fetch && regcache->registers_valid == 0) |
51 | { | |
0bfdf32f | 52 | struct thread_info *saved_thread = current_thread; |
442ea881 | 53 | |
0bfdf32f | 54 | current_thread = thread; |
098dbe61 | 55 | /* Invalidate all registers, to prevent stale left-overs. */ |
c4dfafab SDJ |
56 | memset (regcache->register_status, REG_UNAVAILABLE, |
57 | regcache->tdesc->reg_defs.size ()); | |
442ea881 | 58 | fetch_inferior_registers (regcache, -1); |
0bfdf32f | 59 | current_thread = saved_thread; |
0d62e5e8 DJ |
60 | regcache->registers_valid = 1; |
61 | } | |
62 | ||
c04a1aa8 DJ |
63 | return regcache; |
64 | } | |
65 | ||
361c8ade GB |
66 | /* See common/common-regcache.h. */ |
67 | ||
68 | struct regcache * | |
69 | get_thread_regcache_for_ptid (ptid_t ptid) | |
70 | { | |
71 | return get_thread_regcache (find_thread_ptid (ptid), 1); | |
72 | } | |
73 | ||
0d62e5e8 | 74 | void |
3aee8918 | 75 | regcache_invalidate_thread (struct thread_info *thread) |
0d62e5e8 | 76 | { |
442ea881 | 77 | struct regcache *regcache; |
0d62e5e8 | 78 | |
6afd337d | 79 | regcache = thread_regcache_data (thread); |
0d62e5e8 | 80 | |
45ba0d02 PA |
81 | if (regcache == NULL) |
82 | return; | |
83 | ||
0d62e5e8 DJ |
84 | if (regcache->registers_valid) |
85 | { | |
0bfdf32f | 86 | struct thread_info *saved_thread = current_thread; |
0d62e5e8 | 87 | |
0bfdf32f | 88 | current_thread = thread; |
442ea881 | 89 | store_inferior_registers (regcache, -1); |
0bfdf32f | 90 | current_thread = saved_thread; |
0d62e5e8 DJ |
91 | } |
92 | ||
93 | regcache->registers_valid = 0; | |
94 | } | |
95 | ||
3aee8918 PA |
96 | static int |
97 | regcache_invalidate_one (struct inferior_list_entry *entry, | |
98 | void *pid_p) | |
99 | { | |
100 | struct thread_info *thread = (struct thread_info *) entry; | |
101 | int pid = *(int *) pid_p; | |
102 | ||
103 | /* Only invalidate the regcaches of threads of this process. */ | |
104 | if (ptid_get_pid (entry->id) == pid) | |
105 | regcache_invalidate_thread (thread); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
80d82c19 JB |
110 | /* See regcache.h. */ |
111 | ||
112 | void | |
113 | regcache_invalidate_pid (int pid) | |
114 | { | |
115 | find_inferior (&all_threads, regcache_invalidate_one, &pid); | |
116 | } | |
117 | ||
118 | /* See regcache.h. */ | |
119 | ||
0d62e5e8 | 120 | void |
442ea881 | 121 | regcache_invalidate (void) |
0d62e5e8 | 122 | { |
3aee8918 | 123 | /* Only update the threads of the current process. */ |
0bfdf32f | 124 | int pid = ptid_get_pid (current_thread->entry.id); |
3aee8918 | 125 | |
80d82c19 | 126 | regcache_invalidate_pid (pid); |
0d62e5e8 DJ |
127 | } |
128 | ||
fa593d66 PA |
129 | #endif |
130 | ||
219f2f23 | 131 | struct regcache * |
3aee8918 PA |
132 | init_register_cache (struct regcache *regcache, |
133 | const struct target_desc *tdesc, | |
134 | unsigned char *regbuf) | |
219f2f23 PA |
135 | { |
136 | if (regbuf == NULL) | |
137 | { | |
87f6c4e3 | 138 | #ifndef IN_PROCESS_AGENT |
219f2f23 PA |
139 | /* Make sure to zero-initialize the register cache when it is |
140 | created, in case there are registers the target never | |
141 | fetches. This way they'll read as zero instead of | |
142 | garbage. */ | |
3aee8918 | 143 | regcache->tdesc = tdesc; |
224c3ddb SM |
144 | regcache->registers |
145 | = (unsigned char *) xcalloc (1, tdesc->registers_size); | |
219f2f23 | 146 | regcache->registers_owned = 1; |
224c3ddb | 147 | regcache->register_status |
c4dfafab SDJ |
148 | = (unsigned char *) xmalloc (tdesc->reg_defs.size ()); |
149 | memset ((void *) regcache->register_status, REG_UNAVAILABLE, | |
150 | tdesc->reg_defs.size ()); | |
fa593d66 | 151 | #else |
38e08fca | 152 | gdb_assert_not_reached ("can't allocate memory from the heap"); |
fa593d66 | 153 | #endif |
87f6c4e3 GB |
154 | } |
155 | else | |
219f2f23 | 156 | { |
3aee8918 | 157 | regcache->tdesc = tdesc; |
219f2f23 PA |
158 | regcache->registers = regbuf; |
159 | regcache->registers_owned = 0; | |
1c79eb8a PA |
160 | #ifndef IN_PROCESS_AGENT |
161 | regcache->register_status = NULL; | |
162 | #endif | |
219f2f23 PA |
163 | } |
164 | ||
165 | regcache->registers_valid = 0; | |
166 | ||
167 | return regcache; | |
168 | } | |
169 | ||
fa593d66 PA |
170 | #ifndef IN_PROCESS_AGENT |
171 | ||
442ea881 | 172 | struct regcache * |
3aee8918 | 173 | new_register_cache (const struct target_desc *tdesc) |
c04a1aa8 | 174 | { |
8d749320 | 175 | struct regcache *regcache = XCNEW (struct regcache); |
c04a1aa8 | 176 | |
3aee8918 | 177 | gdb_assert (tdesc->registers_size != 0); |
5822d809 | 178 | |
3aee8918 | 179 | return init_register_cache (regcache, tdesc, NULL); |
c04a1aa8 DJ |
180 | } |
181 | ||
182 | void | |
442ea881 | 183 | free_register_cache (struct regcache *regcache) |
c04a1aa8 | 184 | { |
5822d809 PA |
185 | if (regcache) |
186 | { | |
fa593d66 PA |
187 | if (regcache->registers_owned) |
188 | free (regcache->registers); | |
1c79eb8a | 189 | free (regcache->register_status); |
5822d809 PA |
190 | free (regcache); |
191 | } | |
c04a1aa8 DJ |
192 | } |
193 | ||
fa593d66 PA |
194 | #endif |
195 | ||
219f2f23 PA |
196 | void |
197 | regcache_cpy (struct regcache *dst, struct regcache *src) | |
198 | { | |
3aee8918 PA |
199 | gdb_assert (src != NULL && dst != NULL); |
200 | gdb_assert (src->tdesc == dst->tdesc); | |
201 | gdb_assert (src != dst); | |
202 | ||
203 | memcpy (dst->registers, src->registers, src->tdesc->registers_size); | |
1c79eb8a PA |
204 | #ifndef IN_PROCESS_AGENT |
205 | if (dst->register_status != NULL && src->register_status != NULL) | |
3aee8918 | 206 | memcpy (dst->register_status, src->register_status, |
c4dfafab | 207 | src->tdesc->reg_defs.size ()); |
1c79eb8a | 208 | #endif |
219f2f23 PA |
209 | dst->registers_valid = src->registers_valid; |
210 | } | |
211 | ||
219f2f23 | 212 | |
fa593d66 PA |
213 | #ifndef IN_PROCESS_AGENT |
214 | ||
0a30fbc4 | 215 | void |
442ea881 | 216 | registers_to_string (struct regcache *regcache, char *buf) |
0a30fbc4 | 217 | { |
442ea881 | 218 | unsigned char *registers = regcache->registers; |
3aee8918 | 219 | const struct target_desc *tdesc = regcache->tdesc; |
c04a1aa8 | 220 | |
c4dfafab | 221 | for (int i = 0; i < tdesc->reg_defs.size (); ++i) |
1c79eb8a | 222 | { |
c4dfafab SDJ |
223 | struct reg *reg = tdesc->reg_defs[i]; |
224 | ||
1c79eb8a PA |
225 | if (regcache->register_status[i] == REG_VALID) |
226 | { | |
e9371aff | 227 | bin2hex (registers, buf, register_size (tdesc, i)); |
3aee8918 | 228 | buf += register_size (tdesc, i) * 2; |
1c79eb8a PA |
229 | } |
230 | else | |
231 | { | |
3aee8918 PA |
232 | memset (buf, 'x', register_size (tdesc, i) * 2); |
233 | buf += register_size (tdesc, i) * 2; | |
1c79eb8a | 234 | } |
3aee8918 | 235 | registers += register_size (tdesc, i); |
1c79eb8a PA |
236 | } |
237 | *buf = '\0'; | |
0a30fbc4 DJ |
238 | } |
239 | ||
240 | void | |
442ea881 | 241 | registers_from_string (struct regcache *regcache, char *buf) |
0a30fbc4 DJ |
242 | { |
243 | int len = strlen (buf); | |
442ea881 | 244 | unsigned char *registers = regcache->registers; |
3aee8918 | 245 | const struct target_desc *tdesc = regcache->tdesc; |
0a30fbc4 | 246 | |
3aee8918 | 247 | if (len != tdesc->registers_size * 2) |
0a30fbc4 | 248 | { |
1b3f6016 | 249 | warning ("Wrong sized register packet (expected %d bytes, got %d)", |
3aee8918 PA |
250 | 2 * tdesc->registers_size, len); |
251 | if (len > tdesc->registers_size * 2) | |
252 | len = tdesc->registers_size * 2; | |
0a30fbc4 | 253 | } |
a7191e8b | 254 | hex2bin (buf, registers, len / 2); |
0a30fbc4 DJ |
255 | } |
256 | ||
0a30fbc4 | 257 | int |
3aee8918 | 258 | find_regno (const struct target_desc *tdesc, const char *name) |
0a30fbc4 | 259 | { |
c4dfafab SDJ |
260 | for (int i = 0; i < tdesc->reg_defs.size (); ++i) |
261 | { | |
262 | struct reg *reg = tdesc->reg_defs[i]; | |
0a30fbc4 | 263 | |
c4dfafab SDJ |
264 | if (strcmp (name, reg->name) == 0) |
265 | return i; | |
266 | } | |
38e08fca GB |
267 | internal_error (__FILE__, __LINE__, "Unknown register %s requested", |
268 | name); | |
0a30fbc4 DJ |
269 | } |
270 | ||
f7000548 YQ |
271 | #endif |
272 | ||
0a30fbc4 | 273 | struct reg * |
3aee8918 | 274 | find_register_by_number (const struct target_desc *tdesc, int n) |
0a30fbc4 | 275 | { |
c4dfafab | 276 | return tdesc->reg_defs[n]; |
0a30fbc4 DJ |
277 | } |
278 | ||
3aee8918 PA |
279 | #ifndef IN_PROCESS_AGENT |
280 | static void | |
281 | free_register_cache_thread (struct thread_info *thread) | |
282 | { | |
6afd337d | 283 | struct regcache *regcache = thread_regcache_data (thread); |
3aee8918 PA |
284 | |
285 | if (regcache != NULL) | |
286 | { | |
287 | regcache_invalidate_thread (thread); | |
288 | free_register_cache (regcache); | |
6afd337d | 289 | set_thread_regcache_data (thread, NULL); |
3aee8918 PA |
290 | } |
291 | } | |
292 | ||
293 | static void | |
294 | free_register_cache_thread_one (struct inferior_list_entry *entry) | |
295 | { | |
296 | struct thread_info *thread = (struct thread_info *) entry; | |
297 | ||
298 | free_register_cache_thread (thread); | |
299 | } | |
300 | ||
301 | void | |
302 | regcache_release (void) | |
303 | { | |
304 | /* Flush and release all pre-existing register caches. */ | |
305 | for_each_inferior (&all_threads, free_register_cache_thread_one); | |
306 | } | |
307 | #endif | |
308 | ||
0a30fbc4 | 309 | int |
3aee8918 | 310 | register_cache_size (const struct target_desc *tdesc) |
0a30fbc4 | 311 | { |
3aee8918 PA |
312 | return tdesc->registers_size; |
313 | } | |
314 | ||
315 | int | |
316 | register_size (const struct target_desc *tdesc, int n) | |
317 | { | |
f7000548 | 318 | return find_register_by_number (tdesc, n)->size / 8; |
0a30fbc4 DJ |
319 | } |
320 | ||
8d689ee5 YQ |
321 | /* See common/common-regcache.h. */ |
322 | ||
323 | int | |
324 | regcache_register_size (const struct regcache *regcache, int n) | |
325 | { | |
326 | return register_size (regcache->tdesc, n); | |
327 | } | |
328 | ||
f450004a | 329 | static unsigned char * |
442ea881 | 330 | register_data (struct regcache *regcache, int n, int fetch) |
0a30fbc4 | 331 | { |
f7000548 YQ |
332 | return (regcache->registers |
333 | + find_register_by_number (regcache->tdesc, n)->offset / 8); | |
0a30fbc4 DJ |
334 | } |
335 | ||
1c79eb8a PA |
336 | /* Supply register N, whose contents are stored in BUF, to REGCACHE. |
337 | If BUF is NULL, the register's value is recorded as | |
338 | unavailable. */ | |
339 | ||
58caa3dc | 340 | void |
442ea881 | 341 | supply_register (struct regcache *regcache, int n, const void *buf) |
58caa3dc | 342 | { |
3327ccf7 | 343 | if (buf) |
1c79eb8a | 344 | { |
3aee8918 PA |
345 | memcpy (register_data (regcache, n, 0), buf, |
346 | register_size (regcache->tdesc, n)); | |
1c79eb8a PA |
347 | #ifndef IN_PROCESS_AGENT |
348 | if (regcache->register_status != NULL) | |
349 | regcache->register_status[n] = REG_VALID; | |
350 | #endif | |
351 | } | |
3327ccf7 | 352 | else |
1c79eb8a | 353 | { |
3aee8918 PA |
354 | memset (register_data (regcache, n, 0), 0, |
355 | register_size (regcache->tdesc, n)); | |
1c79eb8a PA |
356 | #ifndef IN_PROCESS_AGENT |
357 | if (regcache->register_status != NULL) | |
358 | regcache->register_status[n] = REG_UNAVAILABLE; | |
359 | #endif | |
360 | } | |
58caa3dc DJ |
361 | } |
362 | ||
1c79eb8a PA |
363 | /* Supply register N with value zero to REGCACHE. */ |
364 | ||
365 | void | |
366 | supply_register_zeroed (struct regcache *regcache, int n) | |
367 | { | |
3aee8918 PA |
368 | memset (register_data (regcache, n, 0), 0, |
369 | register_size (regcache->tdesc, n)); | |
1c79eb8a PA |
370 | #ifndef IN_PROCESS_AGENT |
371 | if (regcache->register_status != NULL) | |
372 | regcache->register_status[n] = REG_VALID; | |
373 | #endif | |
374 | } | |
375 | ||
376 | /* Supply the whole register set whose contents are stored in BUF, to | |
377 | REGCACHE. If BUF is NULL, all the registers' values are recorded | |
378 | as unavailable. */ | |
379 | ||
219f2f23 PA |
380 | void |
381 | supply_regblock (struct regcache *regcache, const void *buf) | |
382 | { | |
383 | if (buf) | |
1c79eb8a | 384 | { |
3aee8918 PA |
385 | const struct target_desc *tdesc = regcache->tdesc; |
386 | ||
387 | memcpy (regcache->registers, buf, tdesc->registers_size); | |
1c79eb8a PA |
388 | #ifndef IN_PROCESS_AGENT |
389 | { | |
390 | int i; | |
391 | ||
c4dfafab | 392 | for (i = 0; i < tdesc->reg_defs.size (); i++) |
1c79eb8a PA |
393 | regcache->register_status[i] = REG_VALID; |
394 | } | |
395 | #endif | |
396 | } | |
219f2f23 | 397 | else |
1c79eb8a | 398 | { |
3aee8918 PA |
399 | const struct target_desc *tdesc = regcache->tdesc; |
400 | ||
401 | memset (regcache->registers, 0, tdesc->registers_size); | |
1c79eb8a PA |
402 | #ifndef IN_PROCESS_AGENT |
403 | { | |
404 | int i; | |
405 | ||
c4dfafab | 406 | for (i = 0; i < tdesc->reg_defs.size (); i++) |
1c79eb8a PA |
407 | regcache->register_status[i] = REG_UNAVAILABLE; |
408 | } | |
409 | #endif | |
410 | } | |
219f2f23 PA |
411 | } |
412 | ||
fa593d66 PA |
413 | #ifndef IN_PROCESS_AGENT |
414 | ||
58caa3dc | 415 | void |
442ea881 PA |
416 | supply_register_by_name (struct regcache *regcache, |
417 | const char *name, const void *buf) | |
58caa3dc | 418 | { |
3aee8918 | 419 | supply_register (regcache, find_regno (regcache->tdesc, name), buf); |
58caa3dc DJ |
420 | } |
421 | ||
fa593d66 PA |
422 | #endif |
423 | ||
58caa3dc | 424 | void |
442ea881 | 425 | collect_register (struct regcache *regcache, int n, void *buf) |
58caa3dc | 426 | { |
3aee8918 PA |
427 | memcpy (buf, register_data (regcache, n, 1), |
428 | register_size (regcache->tdesc, n)); | |
0d62e5e8 DJ |
429 | } |
430 | ||
68ce2059 AT |
431 | enum register_status |
432 | regcache_raw_read_unsigned (struct regcache *regcache, int regnum, | |
433 | ULONGEST *val) | |
434 | { | |
435 | int size; | |
436 | ||
437 | gdb_assert (regcache != NULL); | |
f7000548 | 438 | gdb_assert (regnum >= 0 |
c4dfafab | 439 | && regnum < regcache->tdesc->reg_defs.size ()); |
68ce2059 AT |
440 | |
441 | size = register_size (regcache->tdesc, regnum); | |
442 | ||
443 | if (size > (int) sizeof (ULONGEST)) | |
444 | error (_("That operation is not available on integers of more than" | |
445 | "%d bytes."), | |
446 | (int) sizeof (ULONGEST)); | |
447 | ||
9f6a71b4 | 448 | *val = 0; |
68ce2059 AT |
449 | collect_register (regcache, regnum, val); |
450 | ||
451 | return REG_VALID; | |
452 | } | |
453 | ||
fa593d66 PA |
454 | #ifndef IN_PROCESS_AGENT |
455 | ||
0d62e5e8 | 456 | void |
442ea881 | 457 | collect_register_as_string (struct regcache *regcache, int n, char *buf) |
0d62e5e8 | 458 | { |
e9371aff TT |
459 | bin2hex (register_data (regcache, n, 1), buf, |
460 | register_size (regcache->tdesc, n)); | |
58caa3dc DJ |
461 | } |
462 | ||
463 | void | |
442ea881 PA |
464 | collect_register_by_name (struct regcache *regcache, |
465 | const char *name, void *buf) | |
58caa3dc | 466 | { |
3aee8918 | 467 | collect_register (regcache, find_regno (regcache->tdesc, name), buf); |
58caa3dc | 468 | } |
219f2f23 PA |
469 | |
470 | /* Special handling for register PC. */ | |
471 | ||
472 | CORE_ADDR | |
473 | regcache_read_pc (struct regcache *regcache) | |
474 | { | |
475 | CORE_ADDR pc_val; | |
476 | ||
477 | if (the_target->read_pc) | |
478 | pc_val = the_target->read_pc (regcache); | |
479 | else | |
480 | internal_error (__FILE__, __LINE__, | |
481 | "regcache_read_pc: Unable to find PC"); | |
482 | ||
483 | return pc_val; | |
484 | } | |
485 | ||
486 | void | |
487 | regcache_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
488 | { | |
489 | if (the_target->write_pc) | |
490 | the_target->write_pc (regcache, pc); | |
491 | else | |
492 | internal_error (__FILE__, __LINE__, | |
493 | "regcache_write_pc: Unable to update PC"); | |
494 | } | |
fa593d66 PA |
495 | |
496 | #endif |