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69d05d38 HZ |
1 | /* Process record and replay target for GDB, the GNU debugger. |
2 | ||
3 | Copyright (C) 2008, 2009 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
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 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "gdbcmd.h" | |
22 | #include "regcache.h" | |
23 | #include "gdbthread.h" | |
24 | #include "event-top.h" | |
25 | #include "exceptions.h" | |
0156b218 MS |
26 | #include "completer.h" |
27 | #include "arch-utils.h" | |
27699eea MS |
28 | #include "gdbcore.h" |
29 | #include "exec.h" | |
69d05d38 | 30 | #include "record.h" |
0156b218 MS |
31 | #include "elf-bfd.h" |
32 | #include "gcore.h" | |
69d05d38 HZ |
33 | |
34 | #include <signal.h> | |
35 | ||
6df67667 MS |
36 | /* This module implements "target record", also known as "process |
37 | record and replay". This target sits on top of a "normal" target | |
38 | (a target that "has execution"), and provides a record and replay | |
39 | functionality, including reverse debugging. | |
40 | ||
41 | Target record has two modes: recording, and replaying. | |
42 | ||
43 | In record mode, we intercept the to_resume and to_wait methods. | |
44 | Whenever gdb resumes the target, we run the target in single step | |
45 | mode, and we build up an execution log in which, for each executed | |
46 | instruction, we record all changes in memory and register state. | |
47 | This is invisible to the user, to whom it just looks like an | |
48 | ordinary debugging session (except for performance degredation). | |
49 | ||
50 | In replay mode, instead of actually letting the inferior run as a | |
51 | process, we simulate its execution by playing back the recorded | |
52 | execution log. For each instruction in the log, we simulate the | |
53 | instruction's side effects by duplicating the changes that it would | |
54 | have made on memory and registers. */ | |
55 | ||
69d05d38 HZ |
56 | #define DEFAULT_RECORD_INSN_MAX_NUM 200000 |
57 | ||
58 | #define RECORD_IS_REPLAY \ | |
59 | (record_list->next || execution_direction == EXEC_REVERSE) | |
60 | ||
0156b218 MS |
61 | #define RECORD_FILE_MAGIC netorder32(0x20091016) |
62 | ||
fda458ee | 63 | /* These are the core structs of the process record functionality. |
69d05d38 | 64 | |
fda458ee | 65 | A record_entry is a record of the value change of a register |
69d05d38 | 66 | ("record_reg") or a part of memory ("record_mem"). And each |
fda458ee MS |
67 | instruction must have a struct record_entry ("record_end") that |
68 | indicates that this is the last struct record_entry of this | |
69 | instruction. | |
69d05d38 | 70 | |
fda458ee MS |
71 | Each struct record_entry is linked to "record_list" by "prev" and |
72 | "next" pointers. */ | |
69d05d38 | 73 | |
69d05d38 HZ |
74 | struct record_mem_entry |
75 | { | |
76 | CORE_ADDR addr; | |
77 | int len; | |
afd0cd3f MS |
78 | /* Set this flag if target memory for this entry |
79 | can no longer be accessed. */ | |
80 | int mem_entry_not_accessible; | |
44389f9b MS |
81 | union |
82 | { | |
83 | gdb_byte *ptr; | |
84 | gdb_byte buf[sizeof (gdb_byte *)]; | |
85 | } u; | |
86 | }; | |
87 | ||
88 | struct record_reg_entry | |
89 | { | |
90 | unsigned short num; | |
91 | unsigned short len; | |
92 | union | |
93 | { | |
94 | gdb_byte *ptr; | |
95 | gdb_byte buf[2 * sizeof (gdb_byte *)]; | |
96 | } u; | |
69d05d38 HZ |
97 | }; |
98 | ||
8b739a96 HZ |
99 | struct record_end_entry |
100 | { | |
101 | enum target_signal sigval; | |
b54295a7 | 102 | ULONGEST insn_num; |
8b739a96 HZ |
103 | }; |
104 | ||
69d05d38 HZ |
105 | enum record_type |
106 | { | |
107 | record_end = 0, | |
108 | record_reg, | |
109 | record_mem | |
110 | }; | |
111 | ||
6df67667 MS |
112 | /* This is the data structure that makes up the execution log. |
113 | ||
114 | The execution log consists of a single linked list of entries | |
115 | of type "struct record_entry". It is doubly linked so that it | |
116 | can be traversed in either direction. | |
117 | ||
118 | The start of the list is anchored by a struct called | |
119 | "record_first". The pointer "record_list" either points to the | |
120 | last entry that was added to the list (in record mode), or to the | |
121 | next entry in the list that will be executed (in replay mode). | |
122 | ||
123 | Each list element (struct record_entry), in addition to next and | |
124 | prev pointers, consists of a union of three entry types: mem, reg, | |
125 | and end. A field called "type" determines which entry type is | |
126 | represented by a given list element. | |
127 | ||
128 | Each instruction that is added to the execution log is represented | |
129 | by a variable number of list elements ('entries'). The instruction | |
130 | will have one "reg" entry for each register that is changed by | |
131 | executing the instruction (including the PC in every case). It | |
132 | will also have one "mem" entry for each memory change. Finally, | |
133 | each instruction will have an "end" entry that separates it from | |
134 | the changes associated with the next instruction. */ | |
135 | ||
69d05d38 HZ |
136 | struct record_entry |
137 | { | |
138 | struct record_entry *prev; | |
139 | struct record_entry *next; | |
140 | enum record_type type; | |
141 | union | |
142 | { | |
143 | /* reg */ | |
144 | struct record_reg_entry reg; | |
145 | /* mem */ | |
146 | struct record_mem_entry mem; | |
8b739a96 HZ |
147 | /* end */ |
148 | struct record_end_entry end; | |
69d05d38 HZ |
149 | } u; |
150 | }; | |
151 | ||
152 | /* This is the debug switch for process record. */ | |
153 | int record_debug = 0; | |
154 | ||
27699eea MS |
155 | struct record_core_buf_entry |
156 | { | |
157 | struct record_core_buf_entry *prev; | |
158 | struct target_section *p; | |
159 | bfd_byte *buf; | |
160 | }; | |
161 | ||
162 | /* Record buf with core target. */ | |
163 | static gdb_byte *record_core_regbuf = NULL; | |
164 | static struct target_section *record_core_start; | |
165 | static struct target_section *record_core_end; | |
166 | static struct record_core_buf_entry *record_core_buf_list = NULL; | |
167 | ||
6df67667 MS |
168 | /* The following variables are used for managing the linked list that |
169 | represents the execution log. | |
170 | ||
171 | record_first is the anchor that holds down the beginning of the list. | |
172 | ||
173 | record_list serves two functions: | |
174 | 1) In record mode, it anchors the end of the list. | |
175 | 2) In replay mode, it traverses the list and points to | |
176 | the next instruction that must be emulated. | |
177 | ||
178 | record_arch_list_head and record_arch_list_tail are used to manage | |
179 | a separate list, which is used to build up the change elements of | |
180 | the currently executing instruction during record mode. When this | |
181 | instruction has been completely annotated in the "arch list", it | |
182 | will be appended to the main execution log. */ | |
183 | ||
69d05d38 HZ |
184 | static struct record_entry record_first; |
185 | static struct record_entry *record_list = &record_first; | |
186 | static struct record_entry *record_arch_list_head = NULL; | |
187 | static struct record_entry *record_arch_list_tail = NULL; | |
188 | ||
189 | /* 1 ask user. 0 auto delete the last struct record_entry. */ | |
190 | static int record_stop_at_limit = 1; | |
b54295a7 | 191 | /* Maximum allowed number of insns in execution log. */ |
191e1813 | 192 | static unsigned int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM; |
b54295a7 | 193 | /* Actual count of insns presently in execution log. */ |
69d05d38 | 194 | static int record_insn_num = 0; |
b54295a7 MS |
195 | /* Count of insns logged so far (may be larger |
196 | than count of insns presently in execution log). */ | |
197 | static ULONGEST record_insn_count; | |
69d05d38 HZ |
198 | |
199 | /* The target_ops of process record. */ | |
200 | static struct target_ops record_ops; | |
27699eea | 201 | static struct target_ops record_core_ops; |
69d05d38 HZ |
202 | |
203 | /* The beneath function pointers. */ | |
204 | static struct target_ops *record_beneath_to_resume_ops; | |
205 | static void (*record_beneath_to_resume) (struct target_ops *, ptid_t, int, | |
206 | enum target_signal); | |
207 | static struct target_ops *record_beneath_to_wait_ops; | |
208 | static ptid_t (*record_beneath_to_wait) (struct target_ops *, ptid_t, | |
47608cb1 PA |
209 | struct target_waitstatus *, |
210 | int); | |
69d05d38 HZ |
211 | static struct target_ops *record_beneath_to_store_registers_ops; |
212 | static void (*record_beneath_to_store_registers) (struct target_ops *, | |
213 | struct regcache *, | |
214 | int regno); | |
215 | static struct target_ops *record_beneath_to_xfer_partial_ops; | |
216 | static LONGEST (*record_beneath_to_xfer_partial) (struct target_ops *ops, | |
217 | enum target_object object, | |
218 | const char *annex, | |
219 | gdb_byte *readbuf, | |
220 | const gdb_byte *writebuf, | |
221 | ULONGEST offset, | |
222 | LONGEST len); | |
a6d9a66e UW |
223 | static int (*record_beneath_to_insert_breakpoint) (struct gdbarch *, |
224 | struct bp_target_info *); | |
225 | static int (*record_beneath_to_remove_breakpoint) (struct gdbarch *, | |
226 | struct bp_target_info *); | |
69d05d38 | 227 | |
61f75dd8 MS |
228 | /* Alloc and free functions for record_reg, record_mem, and record_end |
229 | entries. */ | |
230 | ||
231 | /* Alloc a record_reg record entry. */ | |
232 | ||
233 | static inline struct record_entry * | |
234 | record_reg_alloc (struct regcache *regcache, int regnum) | |
235 | { | |
236 | struct record_entry *rec; | |
237 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
238 | ||
239 | rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry)); | |
240 | rec->type = record_reg; | |
241 | rec->u.reg.num = regnum; | |
44389f9b MS |
242 | rec->u.reg.len = register_size (gdbarch, regnum); |
243 | if (rec->u.reg.len > sizeof (rec->u.reg.u.buf)) | |
244 | rec->u.reg.u.ptr = (gdb_byte *) xmalloc (rec->u.reg.len); | |
61f75dd8 MS |
245 | |
246 | return rec; | |
247 | } | |
248 | ||
249 | /* Free a record_reg record entry. */ | |
250 | ||
251 | static inline void | |
252 | record_reg_release (struct record_entry *rec) | |
253 | { | |
254 | gdb_assert (rec->type == record_reg); | |
44389f9b MS |
255 | if (rec->u.reg.len > sizeof (rec->u.reg.u.buf)) |
256 | xfree (rec->u.reg.u.ptr); | |
61f75dd8 MS |
257 | xfree (rec); |
258 | } | |
259 | ||
260 | /* Alloc a record_mem record entry. */ | |
261 | ||
262 | static inline struct record_entry * | |
263 | record_mem_alloc (CORE_ADDR addr, int len) | |
264 | { | |
265 | struct record_entry *rec; | |
266 | ||
267 | rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry)); | |
268 | rec->type = record_mem; | |
269 | rec->u.mem.addr = addr; | |
270 | rec->u.mem.len = len; | |
44389f9b MS |
271 | if (rec->u.mem.len > sizeof (rec->u.mem.u.buf)) |
272 | rec->u.mem.u.ptr = (gdb_byte *) xmalloc (len); | |
61f75dd8 MS |
273 | |
274 | return rec; | |
275 | } | |
276 | ||
277 | /* Free a record_mem record entry. */ | |
278 | ||
279 | static inline void | |
280 | record_mem_release (struct record_entry *rec) | |
281 | { | |
282 | gdb_assert (rec->type == record_mem); | |
44389f9b MS |
283 | if (rec->u.mem.len > sizeof (rec->u.mem.u.buf)) |
284 | xfree (rec->u.mem.u.ptr); | |
61f75dd8 MS |
285 | xfree (rec); |
286 | } | |
287 | ||
288 | /* Alloc a record_end record entry. */ | |
289 | ||
290 | static inline struct record_entry * | |
291 | record_end_alloc (void) | |
292 | { | |
293 | struct record_entry *rec; | |
294 | ||
295 | rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry)); | |
296 | rec->type = record_end; | |
297 | ||
298 | return rec; | |
299 | } | |
300 | ||
301 | /* Free a record_end record entry. */ | |
302 | ||
303 | static inline void | |
304 | record_end_release (struct record_entry *rec) | |
305 | { | |
306 | xfree (rec); | |
307 | } | |
308 | ||
309 | /* Free one record entry, any type. | |
310 | Return entry->type, in case caller wants to know. */ | |
311 | ||
312 | static inline enum record_type | |
313 | record_entry_release (struct record_entry *rec) | |
314 | { | |
315 | enum record_type type = rec->type; | |
316 | ||
317 | switch (type) { | |
318 | case record_reg: | |
319 | record_reg_release (rec); | |
320 | break; | |
321 | case record_mem: | |
322 | record_mem_release (rec); | |
323 | break; | |
324 | case record_end: | |
325 | record_end_release (rec); | |
326 | break; | |
327 | } | |
328 | return type; | |
329 | } | |
330 | ||
331 | /* Free all record entries in list pointed to by REC. */ | |
332 | ||
69d05d38 HZ |
333 | static void |
334 | record_list_release (struct record_entry *rec) | |
335 | { | |
69d05d38 HZ |
336 | if (!rec) |
337 | return; | |
338 | ||
339 | while (rec->next) | |
61f75dd8 | 340 | rec = rec->next; |
69d05d38 HZ |
341 | |
342 | while (rec->prev) | |
343 | { | |
69d05d38 | 344 | rec = rec->prev; |
61f75dd8 | 345 | record_entry_release (rec->next); |
69d05d38 HZ |
346 | } |
347 | ||
61f75dd8 MS |
348 | if (rec == &record_first) |
349 | { | |
350 | record_insn_num = 0; | |
351 | record_first.next = NULL; | |
352 | } | |
353 | else | |
354 | record_entry_release (rec); | |
69d05d38 HZ |
355 | } |
356 | ||
61f75dd8 MS |
357 | /* Free all record entries forward of the given list position. */ |
358 | ||
69d05d38 | 359 | static void |
61f75dd8 | 360 | record_list_release_following (struct record_entry *rec) |
69d05d38 | 361 | { |
69d05d38 | 362 | struct record_entry *tmp = rec->next; |
61f75dd8 | 363 | |
69d05d38 HZ |
364 | rec->next = NULL; |
365 | while (tmp) | |
366 | { | |
367 | rec = tmp->next; | |
61f75dd8 | 368 | if (record_entry_release (tmp) == record_end) |
b54295a7 MS |
369 | { |
370 | record_insn_num--; | |
371 | record_insn_count--; | |
372 | } | |
69d05d38 HZ |
373 | tmp = rec; |
374 | } | |
375 | } | |
376 | ||
265aad34 MS |
377 | /* Delete the first instruction from the beginning of the log, to make |
378 | room for adding a new instruction at the end of the log. | |
379 | ||
380 | Note -- this function does not modify record_insn_num. */ | |
381 | ||
69d05d38 HZ |
382 | static void |
383 | record_list_release_first (void) | |
384 | { | |
61f75dd8 | 385 | struct record_entry *tmp; |
69d05d38 HZ |
386 | |
387 | if (!record_first.next) | |
388 | return; | |
389 | ||
61f75dd8 | 390 | /* Loop until a record_end. */ |
69d05d38 HZ |
391 | while (1) |
392 | { | |
61f75dd8 | 393 | /* Cut record_first.next out of the linked list. */ |
69d05d38 HZ |
394 | tmp = record_first.next; |
395 | record_first.next = tmp->next; | |
61f75dd8 MS |
396 | tmp->next->prev = &record_first; |
397 | ||
398 | /* tmp is now isolated, and can be deleted. */ | |
399 | if (record_entry_release (tmp) == record_end) | |
b54295a7 | 400 | break; /* End loop at first record_end. */ |
69d05d38 HZ |
401 | |
402 | if (!record_first.next) | |
403 | { | |
404 | gdb_assert (record_insn_num == 1); | |
61f75dd8 | 405 | break; /* End loop when list is empty. */ |
69d05d38 | 406 | } |
69d05d38 | 407 | } |
69d05d38 HZ |
408 | } |
409 | ||
410 | /* Add a struct record_entry to record_arch_list. */ | |
411 | ||
412 | static void | |
413 | record_arch_list_add (struct record_entry *rec) | |
414 | { | |
415 | if (record_debug > 1) | |
416 | fprintf_unfiltered (gdb_stdlog, | |
417 | "Process record: record_arch_list_add %s.\n", | |
418 | host_address_to_string (rec)); | |
419 | ||
420 | if (record_arch_list_tail) | |
421 | { | |
422 | record_arch_list_tail->next = rec; | |
423 | rec->prev = record_arch_list_tail; | |
424 | record_arch_list_tail = rec; | |
425 | } | |
426 | else | |
427 | { | |
428 | record_arch_list_head = rec; | |
429 | record_arch_list_tail = rec; | |
430 | } | |
431 | } | |
432 | ||
44389f9b MS |
433 | /* Return the value storage location of a record entry. */ |
434 | static inline gdb_byte * | |
435 | record_get_loc (struct record_entry *rec) | |
436 | { | |
437 | switch (rec->type) { | |
438 | case record_mem: | |
439 | if (rec->u.mem.len > sizeof (rec->u.mem.u.buf)) | |
440 | return rec->u.mem.u.ptr; | |
441 | else | |
442 | return rec->u.mem.u.buf; | |
443 | case record_reg: | |
444 | if (rec->u.reg.len > sizeof (rec->u.reg.u.buf)) | |
445 | return rec->u.reg.u.ptr; | |
446 | else | |
447 | return rec->u.reg.u.buf; | |
448 | case record_end: | |
449 | default: | |
450 | gdb_assert (0); | |
451 | return NULL; | |
452 | } | |
453 | } | |
454 | ||
455 | /* Record the value of a register NUM to record_arch_list. */ | |
69d05d38 HZ |
456 | |
457 | int | |
61f75dd8 | 458 | record_arch_list_add_reg (struct regcache *regcache, int regnum) |
69d05d38 HZ |
459 | { |
460 | struct record_entry *rec; | |
461 | ||
462 | if (record_debug > 1) | |
463 | fprintf_unfiltered (gdb_stdlog, | |
464 | "Process record: add register num = %d to " | |
465 | "record list.\n", | |
61f75dd8 | 466 | regnum); |
69d05d38 | 467 | |
61f75dd8 | 468 | rec = record_reg_alloc (regcache, regnum); |
69d05d38 | 469 | |
44389f9b | 470 | regcache_raw_read (regcache, regnum, record_get_loc (rec)); |
69d05d38 HZ |
471 | |
472 | record_arch_list_add (rec); | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | /* Record the value of a region of memory whose address is ADDR and | |
478 | length is LEN to record_arch_list. */ | |
479 | ||
480 | int | |
481 | record_arch_list_add_mem (CORE_ADDR addr, int len) | |
482 | { | |
483 | struct record_entry *rec; | |
484 | ||
485 | if (record_debug > 1) | |
486 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 | 487 | "Process record: add mem addr = %s len = %d to " |
69d05d38 | 488 | "record list.\n", |
5af949e3 | 489 | paddress (target_gdbarch, addr), len); |
69d05d38 | 490 | |
61f75dd8 | 491 | if (!addr) /* FIXME: Why? Some arch must permit it... */ |
69d05d38 HZ |
492 | return 0; |
493 | ||
61f75dd8 | 494 | rec = record_mem_alloc (addr, len); |
69d05d38 | 495 | |
44389f9b | 496 | if (target_read_memory (addr, record_get_loc (rec), len)) |
69d05d38 HZ |
497 | { |
498 | if (record_debug) | |
499 | fprintf_unfiltered (gdb_stdlog, | |
500 | "Process record: error reading memory at " | |
5af949e3 UW |
501 | "addr = %s len = %d.\n", |
502 | paddress (target_gdbarch, addr), len); | |
61f75dd8 | 503 | record_mem_release (rec); |
69d05d38 HZ |
504 | return -1; |
505 | } | |
506 | ||
507 | record_arch_list_add (rec); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | /* Add a record_end type struct record_entry to record_arch_list. */ | |
513 | ||
514 | int | |
515 | record_arch_list_add_end (void) | |
516 | { | |
517 | struct record_entry *rec; | |
518 | ||
519 | if (record_debug > 1) | |
520 | fprintf_unfiltered (gdb_stdlog, | |
521 | "Process record: add end to arch list.\n"); | |
522 | ||
61f75dd8 | 523 | rec = record_end_alloc (); |
8b739a96 | 524 | rec->u.end.sigval = TARGET_SIGNAL_0; |
b54295a7 | 525 | rec->u.end.insn_num = ++record_insn_count; |
69d05d38 HZ |
526 | |
527 | record_arch_list_add (rec); | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | static void | |
533 | record_check_insn_num (int set_terminal) | |
534 | { | |
535 | if (record_insn_max_num) | |
536 | { | |
537 | gdb_assert (record_insn_num <= record_insn_max_num); | |
538 | if (record_insn_num == record_insn_max_num) | |
539 | { | |
540 | /* Ask user what to do. */ | |
541 | if (record_stop_at_limit) | |
542 | { | |
543 | int q; | |
544 | if (set_terminal) | |
545 | target_terminal_ours (); | |
546 | q = yquery (_("Do you want to auto delete previous execution " | |
547 | "log entries when record/replay buffer becomes " | |
548 | "full (record stop-at-limit)?")); | |
549 | if (set_terminal) | |
550 | target_terminal_inferior (); | |
551 | if (q) | |
552 | record_stop_at_limit = 0; | |
553 | else | |
0156b218 | 554 | error (_("Process record: stopped by user.")); |
69d05d38 HZ |
555 | } |
556 | } | |
557 | } | |
558 | } | |
559 | ||
0156b218 MS |
560 | static void |
561 | record_arch_list_cleanups (void *ignore) | |
562 | { | |
563 | record_list_release (record_arch_list_tail); | |
564 | } | |
565 | ||
69d05d38 HZ |
566 | /* Before inferior step (when GDB record the running message, inferior |
567 | only can step), GDB will call this function to record the values to | |
568 | record_list. This function will call gdbarch_process_record to | |
569 | record the running message of inferior and set them to | |
570 | record_arch_list, and add it to record_list. */ | |
571 | ||
8b739a96 HZ |
572 | struct record_message_args { |
573 | struct regcache *regcache; | |
574 | enum target_signal signal; | |
575 | }; | |
576 | ||
69d05d38 HZ |
577 | static int |
578 | record_message (void *args) | |
579 | { | |
580 | int ret; | |
8b739a96 HZ |
581 | struct record_message_args *myargs = args; |
582 | struct gdbarch *gdbarch = get_regcache_arch (myargs->regcache); | |
0156b218 | 583 | struct cleanup *old_cleanups = make_cleanup (record_arch_list_cleanups, 0); |
69d05d38 HZ |
584 | |
585 | record_arch_list_head = NULL; | |
586 | record_arch_list_tail = NULL; | |
587 | ||
588 | /* Check record_insn_num. */ | |
589 | record_check_insn_num (1); | |
590 | ||
8b739a96 HZ |
591 | /* If gdb sends a signal value to target_resume, |
592 | save it in the 'end' field of the previous instruction. | |
593 | ||
594 | Maybe process record should record what really happened, | |
595 | rather than what gdb pretends has happened. | |
596 | ||
597 | So if Linux delivered the signal to the child process during | |
598 | the record mode, we will record it and deliver it again in | |
599 | the replay mode. | |
600 | ||
601 | If user says "ignore this signal" during the record mode, then | |
602 | it will be ignored again during the replay mode (no matter if | |
603 | the user says something different, like "deliver this signal" | |
604 | during the replay mode). | |
605 | ||
606 | User should understand that nothing he does during the replay | |
607 | mode will change the behavior of the child. If he tries, | |
608 | then that is a user error. | |
609 | ||
610 | But we should still deliver the signal to gdb during the replay, | |
611 | if we delivered it during the recording. Therefore we should | |
612 | record the signal during record_wait, not record_resume. */ | |
613 | if (record_list != &record_first) /* FIXME better way to check */ | |
614 | { | |
615 | gdb_assert (record_list->type == record_end); | |
616 | record_list->u.end.sigval = myargs->signal; | |
617 | } | |
618 | ||
619 | if (myargs->signal == TARGET_SIGNAL_0 | |
620 | || !gdbarch_process_record_signal_p (gdbarch)) | |
621 | ret = gdbarch_process_record (gdbarch, | |
622 | myargs->regcache, | |
623 | regcache_read_pc (myargs->regcache)); | |
624 | else | |
625 | ret = gdbarch_process_record_signal (gdbarch, | |
626 | myargs->regcache, | |
627 | myargs->signal); | |
628 | ||
69d05d38 HZ |
629 | if (ret > 0) |
630 | error (_("Process record: inferior program stopped.")); | |
631 | if (ret < 0) | |
632 | error (_("Process record: failed to record execution log.")); | |
633 | ||
634 | discard_cleanups (old_cleanups); | |
635 | ||
636 | record_list->next = record_arch_list_head; | |
637 | record_arch_list_head->prev = record_list; | |
638 | record_list = record_arch_list_tail; | |
639 | ||
640 | if (record_insn_num == record_insn_max_num && record_insn_max_num) | |
641 | record_list_release_first (); | |
642 | else | |
643 | record_insn_num++; | |
644 | ||
645 | return 1; | |
646 | } | |
647 | ||
648 | static int | |
8b739a96 HZ |
649 | do_record_message (struct regcache *regcache, |
650 | enum target_signal signal) | |
69d05d38 | 651 | { |
8b739a96 HZ |
652 | struct record_message_args args; |
653 | ||
654 | args.regcache = regcache; | |
655 | args.signal = signal; | |
656 | return catch_errors (record_message, &args, NULL, RETURN_MASK_ALL); | |
69d05d38 HZ |
657 | } |
658 | ||
659 | /* Set to 1 if record_store_registers and record_xfer_partial | |
660 | doesn't need record. */ | |
661 | ||
662 | static int record_gdb_operation_disable = 0; | |
663 | ||
664 | struct cleanup * | |
665 | record_gdb_operation_disable_set (void) | |
666 | { | |
667 | struct cleanup *old_cleanups = NULL; | |
668 | ||
669 | old_cleanups = | |
670 | make_cleanup_restore_integer (&record_gdb_operation_disable); | |
671 | record_gdb_operation_disable = 1; | |
672 | ||
673 | return old_cleanups; | |
674 | } | |
675 | ||
90ca0479 MS |
676 | /* Execute one instruction from the record log. Each instruction in |
677 | the log will be represented by an arbitrary sequence of register | |
678 | entries and memory entries, followed by an 'end' entry. */ | |
679 | ||
680 | static inline void | |
681 | record_exec_insn (struct regcache *regcache, struct gdbarch *gdbarch, | |
682 | struct record_entry *entry) | |
683 | { | |
684 | switch (entry->type) | |
685 | { | |
686 | case record_reg: /* reg */ | |
687 | { | |
688 | gdb_byte reg[MAX_REGISTER_SIZE]; | |
689 | ||
690 | if (record_debug > 1) | |
691 | fprintf_unfiltered (gdb_stdlog, | |
692 | "Process record: record_reg %s to " | |
693 | "inferior num = %d.\n", | |
694 | host_address_to_string (entry), | |
695 | entry->u.reg.num); | |
696 | ||
697 | regcache_cooked_read (regcache, entry->u.reg.num, reg); | |
698 | regcache_cooked_write (regcache, entry->u.reg.num, | |
699 | record_get_loc (entry)); | |
700 | memcpy (record_get_loc (entry), reg, entry->u.reg.len); | |
701 | } | |
702 | break; | |
703 | ||
704 | case record_mem: /* mem */ | |
705 | { | |
706 | /* Nothing to do if the entry is flagged not_accessible. */ | |
707 | if (!entry->u.mem.mem_entry_not_accessible) | |
708 | { | |
709 | gdb_byte *mem = alloca (entry->u.mem.len); | |
710 | ||
711 | if (record_debug > 1) | |
712 | fprintf_unfiltered (gdb_stdlog, | |
713 | "Process record: record_mem %s to " | |
714 | "inferior addr = %s len = %d.\n", | |
715 | host_address_to_string (entry), | |
716 | paddress (gdbarch, entry->u.mem.addr), | |
717 | entry->u.mem.len); | |
718 | ||
719 | if (target_read_memory (entry->u.mem.addr, mem, entry->u.mem.len)) | |
720 | { | |
721 | entry->u.mem.mem_entry_not_accessible = 1; | |
722 | if (record_debug) | |
0156b218 MS |
723 | warning ("Process record: error reading memory at " |
724 | "addr = %s len = %d.", | |
90ca0479 MS |
725 | paddress (gdbarch, entry->u.mem.addr), |
726 | entry->u.mem.len); | |
727 | } | |
728 | else | |
729 | { | |
730 | if (target_write_memory (entry->u.mem.addr, | |
731 | record_get_loc (entry), | |
732 | entry->u.mem.len)) | |
733 | { | |
734 | entry->u.mem.mem_entry_not_accessible = 1; | |
735 | if (record_debug) | |
0156b218 MS |
736 | warning ("Process record: error writing memory at " |
737 | "addr = %s len = %d.", | |
90ca0479 MS |
738 | paddress (gdbarch, entry->u.mem.addr), |
739 | entry->u.mem.len); | |
740 | } | |
741 | else | |
742 | memcpy (record_get_loc (entry), mem, entry->u.mem.len); | |
743 | } | |
744 | } | |
745 | } | |
746 | break; | |
747 | } | |
748 | } | |
749 | ||
27699eea MS |
750 | static struct target_ops *tmp_to_resume_ops; |
751 | static void (*tmp_to_resume) (struct target_ops *, ptid_t, int, | |
752 | enum target_signal); | |
753 | static struct target_ops *tmp_to_wait_ops; | |
754 | static ptid_t (*tmp_to_wait) (struct target_ops *, ptid_t, | |
755 | struct target_waitstatus *, | |
756 | int); | |
757 | static struct target_ops *tmp_to_store_registers_ops; | |
758 | static void (*tmp_to_store_registers) (struct target_ops *, | |
759 | struct regcache *, | |
760 | int regno); | |
761 | static struct target_ops *tmp_to_xfer_partial_ops; | |
762 | static LONGEST (*tmp_to_xfer_partial) (struct target_ops *ops, | |
763 | enum target_object object, | |
764 | const char *annex, | |
765 | gdb_byte *readbuf, | |
766 | const gdb_byte *writebuf, | |
767 | ULONGEST offset, | |
768 | LONGEST len); | |
769 | static int (*tmp_to_insert_breakpoint) (struct gdbarch *, | |
770 | struct bp_target_info *); | |
771 | static int (*tmp_to_remove_breakpoint) (struct gdbarch *, | |
772 | struct bp_target_info *); | |
773 | ||
0156b218 MS |
774 | static void record_restore (void); |
775 | ||
27699eea | 776 | /* Open the process record target. */ |
6df67667 | 777 | |
69d05d38 | 778 | static void |
27699eea MS |
779 | record_core_open_1 (char *name, int from_tty) |
780 | { | |
781 | struct regcache *regcache = get_current_regcache (); | |
782 | int regnum = gdbarch_num_regs (get_regcache_arch (regcache)); | |
783 | int i; | |
784 | ||
785 | /* Get record_core_regbuf. */ | |
786 | target_fetch_registers (regcache, -1); | |
787 | record_core_regbuf = xmalloc (MAX_REGISTER_SIZE * regnum); | |
788 | for (i = 0; i < regnum; i ++) | |
789 | regcache_raw_collect (regcache, i, | |
790 | record_core_regbuf + MAX_REGISTER_SIZE * i); | |
791 | ||
792 | /* Get record_core_start and record_core_end. */ | |
793 | if (build_section_table (core_bfd, &record_core_start, &record_core_end)) | |
794 | { | |
795 | xfree (record_core_regbuf); | |
796 | record_core_regbuf = NULL; | |
797 | error (_("\"%s\": Can't find sections: %s"), | |
798 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); | |
799 | } | |
800 | ||
801 | push_target (&record_core_ops); | |
0156b218 | 802 | record_restore (); |
27699eea MS |
803 | } |
804 | ||
805 | /* "to_open" target method for 'live' processes. */ | |
806 | ||
807 | static void | |
808 | record_open_1 (char *name, int from_tty) | |
69d05d38 HZ |
809 | { |
810 | struct target_ops *t; | |
811 | ||
812 | if (record_debug) | |
813 | fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n"); | |
814 | ||
815 | /* check exec */ | |
816 | if (!target_has_execution) | |
817 | error (_("Process record: the program is not being run.")); | |
818 | if (non_stop) | |
819 | error (_("Process record target can't debug inferior in non-stop mode " | |
820 | "(non-stop).")); | |
821 | if (target_async_permitted) | |
822 | error (_("Process record target can't debug inferior in asynchronous " | |
823 | "mode (target-async).")); | |
824 | ||
a97b0ac8 | 825 | if (!gdbarch_process_record_p (target_gdbarch)) |
69d05d38 HZ |
826 | error (_("Process record: the current architecture doesn't support " |
827 | "record function.")); | |
828 | ||
27699eea MS |
829 | if (!tmp_to_resume) |
830 | error (_("Could not find 'to_resume' method on the target stack.")); | |
831 | if (!tmp_to_wait) | |
832 | error (_("Could not find 'to_wait' method on the target stack.")); | |
833 | if (!tmp_to_store_registers) | |
834 | error (_("Could not find 'to_store_registers' method on the target stack.")); | |
835 | if (!tmp_to_insert_breakpoint) | |
836 | error (_("Could not find 'to_insert_breakpoint' method on the target stack.")); | |
837 | if (!tmp_to_remove_breakpoint) | |
838 | error (_("Could not find 'to_remove_breakpoint' method on the target stack.")); | |
839 | ||
840 | push_target (&record_ops); | |
841 | } | |
842 | ||
843 | /* "to_open" target method. Open the process record target. */ | |
844 | ||
845 | static void | |
846 | record_open (char *name, int from_tty) | |
847 | { | |
848 | struct target_ops *t; | |
849 | ||
850 | if (record_debug) | |
851 | fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n"); | |
852 | ||
69d05d38 HZ |
853 | /* Check if record target is already running. */ |
854 | if (current_target.to_stratum == record_stratum) | |
5d40bb85 HZ |
855 | error (_("Process record target already running. Use \"record stop\" to " |
856 | "stop record target first.")); | |
69d05d38 | 857 | |
27699eea MS |
858 | /* Reset the tmp beneath pointers. */ |
859 | tmp_to_resume_ops = NULL; | |
860 | tmp_to_resume = NULL; | |
861 | tmp_to_wait_ops = NULL; | |
862 | tmp_to_wait = NULL; | |
863 | tmp_to_store_registers_ops = NULL; | |
864 | tmp_to_store_registers = NULL; | |
865 | tmp_to_xfer_partial_ops = NULL; | |
866 | tmp_to_xfer_partial = NULL; | |
867 | tmp_to_insert_breakpoint = NULL; | |
868 | tmp_to_remove_breakpoint = NULL; | |
69d05d38 HZ |
869 | |
870 | /* Set the beneath function pointers. */ | |
871 | for (t = current_target.beneath; t != NULL; t = t->beneath) | |
872 | { | |
27699eea | 873 | if (!tmp_to_resume) |
69d05d38 | 874 | { |
27699eea MS |
875 | tmp_to_resume = t->to_resume; |
876 | tmp_to_resume_ops = t; | |
69d05d38 | 877 | } |
27699eea | 878 | if (!tmp_to_wait) |
69d05d38 | 879 | { |
27699eea MS |
880 | tmp_to_wait = t->to_wait; |
881 | tmp_to_wait_ops = t; | |
69d05d38 | 882 | } |
27699eea | 883 | if (!tmp_to_store_registers) |
69d05d38 | 884 | { |
27699eea MS |
885 | tmp_to_store_registers = t->to_store_registers; |
886 | tmp_to_store_registers_ops = t; | |
69d05d38 | 887 | } |
27699eea | 888 | if (!tmp_to_xfer_partial) |
69d05d38 | 889 | { |
27699eea MS |
890 | tmp_to_xfer_partial = t->to_xfer_partial; |
891 | tmp_to_xfer_partial_ops = t; | |
69d05d38 | 892 | } |
27699eea MS |
893 | if (!tmp_to_insert_breakpoint) |
894 | tmp_to_insert_breakpoint = t->to_insert_breakpoint; | |
895 | if (!tmp_to_remove_breakpoint) | |
896 | tmp_to_remove_breakpoint = t->to_remove_breakpoint; | |
69d05d38 | 897 | } |
27699eea MS |
898 | if (!tmp_to_xfer_partial) |
899 | error (_("Could not find 'to_xfer_partial' method on the target stack.")); | |
69d05d38 HZ |
900 | |
901 | /* Reset */ | |
902 | record_insn_num = 0; | |
b54295a7 | 903 | record_insn_count = 0; |
69d05d38 HZ |
904 | record_list = &record_first; |
905 | record_list->next = NULL; | |
27699eea MS |
906 | |
907 | /* Set the tmp beneath pointers to beneath pointers. */ | |
908 | record_beneath_to_resume_ops = tmp_to_resume_ops; | |
909 | record_beneath_to_resume = tmp_to_resume; | |
910 | record_beneath_to_wait_ops = tmp_to_wait_ops; | |
911 | record_beneath_to_wait = tmp_to_wait; | |
912 | record_beneath_to_store_registers_ops = tmp_to_store_registers_ops; | |
913 | record_beneath_to_store_registers = tmp_to_store_registers; | |
914 | record_beneath_to_xfer_partial_ops = tmp_to_xfer_partial_ops; | |
915 | record_beneath_to_xfer_partial = tmp_to_xfer_partial; | |
916 | record_beneath_to_insert_breakpoint = tmp_to_insert_breakpoint; | |
917 | record_beneath_to_remove_breakpoint = tmp_to_remove_breakpoint; | |
918 | ||
919 | if (current_target.to_stratum == core_stratum) | |
920 | record_core_open_1 (name, from_tty); | |
921 | else | |
922 | record_open_1 (name, from_tty); | |
69d05d38 HZ |
923 | } |
924 | ||
6df67667 MS |
925 | /* "to_close" target method. Close the process record target. */ |
926 | ||
69d05d38 HZ |
927 | static void |
928 | record_close (int quitting) | |
929 | { | |
27699eea MS |
930 | struct record_core_buf_entry *entry; |
931 | ||
69d05d38 HZ |
932 | if (record_debug) |
933 | fprintf_unfiltered (gdb_stdlog, "Process record: record_close\n"); | |
934 | ||
935 | record_list_release (record_list); | |
27699eea MS |
936 | |
937 | /* Release record_core_regbuf. */ | |
938 | if (record_core_regbuf) | |
939 | { | |
940 | xfree (record_core_regbuf); | |
941 | record_core_regbuf = NULL; | |
942 | } | |
943 | ||
944 | /* Release record_core_buf_list. */ | |
945 | if (record_core_buf_list) | |
946 | { | |
947 | for (entry = record_core_buf_list->prev; entry; entry = entry->prev) | |
948 | { | |
949 | xfree (record_core_buf_list); | |
950 | record_core_buf_list = entry; | |
951 | } | |
952 | record_core_buf_list = NULL; | |
953 | } | |
69d05d38 HZ |
954 | } |
955 | ||
956 | static int record_resume_step = 0; | |
69d05d38 HZ |
957 | static int record_resume_error; |
958 | ||
6df67667 MS |
959 | /* "to_resume" target method. Resume the process record target. */ |
960 | ||
69d05d38 HZ |
961 | static void |
962 | record_resume (struct target_ops *ops, ptid_t ptid, int step, | |
8b739a96 | 963 | enum target_signal signal) |
69d05d38 HZ |
964 | { |
965 | record_resume_step = step; | |
69d05d38 HZ |
966 | |
967 | if (!RECORD_IS_REPLAY) | |
968 | { | |
8b739a96 | 969 | if (do_record_message (get_current_regcache (), signal)) |
69d05d38 HZ |
970 | { |
971 | record_resume_error = 0; | |
972 | } | |
973 | else | |
974 | { | |
975 | record_resume_error = 1; | |
976 | return; | |
977 | } | |
978 | record_beneath_to_resume (record_beneath_to_resume_ops, ptid, 1, | |
8b739a96 | 979 | signal); |
69d05d38 HZ |
980 | } |
981 | } | |
982 | ||
983 | static int record_get_sig = 0; | |
984 | ||
6df67667 MS |
985 | /* SIGINT signal handler, registered by "to_wait" method. */ |
986 | ||
69d05d38 HZ |
987 | static void |
988 | record_sig_handler (int signo) | |
989 | { | |
990 | if (record_debug) | |
991 | fprintf_unfiltered (gdb_stdlog, "Process record: get a signal\n"); | |
992 | ||
993 | /* It will break the running inferior in replay mode. */ | |
994 | record_resume_step = 1; | |
995 | ||
996 | /* It will let record_wait set inferior status to get the signal | |
997 | SIGINT. */ | |
998 | record_get_sig = 1; | |
999 | } | |
1000 | ||
1001 | static void | |
1002 | record_wait_cleanups (void *ignore) | |
1003 | { | |
1004 | if (execution_direction == EXEC_REVERSE) | |
1005 | { | |
1006 | if (record_list->next) | |
1007 | record_list = record_list->next; | |
1008 | } | |
1009 | else | |
1010 | record_list = record_list->prev; | |
1011 | } | |
1012 | ||
6df67667 MS |
1013 | /* "to_wait" target method for process record target. |
1014 | ||
1015 | In record mode, the target is always run in singlestep mode | |
1016 | (even when gdb says to continue). The to_wait method intercepts | |
1017 | the stop events and determines which ones are to be passed on to | |
1018 | gdb. Most stop events are just singlestep events that gdb is not | |
1019 | to know about, so the to_wait method just records them and keeps | |
1020 | singlestepping. | |
1021 | ||
1022 | In replay mode, this function emulates the recorded execution log, | |
1023 | one instruction at a time (forward or backward), and determines | |
1024 | where to stop. */ | |
69d05d38 HZ |
1025 | |
1026 | static ptid_t | |
1027 | record_wait (struct target_ops *ops, | |
47608cb1 PA |
1028 | ptid_t ptid, struct target_waitstatus *status, |
1029 | int options) | |
69d05d38 HZ |
1030 | { |
1031 | struct cleanup *set_cleanups = record_gdb_operation_disable_set (); | |
1032 | ||
1033 | if (record_debug) | |
1034 | fprintf_unfiltered (gdb_stdlog, | |
1035 | "Process record: record_wait " | |
1036 | "record_resume_step = %d\n", | |
1037 | record_resume_step); | |
1038 | ||
27699eea | 1039 | if (!RECORD_IS_REPLAY && ops != &record_core_ops) |
69d05d38 HZ |
1040 | { |
1041 | if (record_resume_error) | |
1042 | { | |
1043 | /* If record_resume get error, return directly. */ | |
1044 | status->kind = TARGET_WAITKIND_STOPPED; | |
1045 | status->value.sig = TARGET_SIGNAL_ABRT; | |
1046 | return inferior_ptid; | |
1047 | } | |
1048 | ||
1049 | if (record_resume_step) | |
1050 | { | |
1051 | /* This is a single step. */ | |
1052 | return record_beneath_to_wait (record_beneath_to_wait_ops, | |
90092760 | 1053 | ptid, status, options); |
69d05d38 HZ |
1054 | } |
1055 | else | |
1056 | { | |
1057 | /* This is not a single step. */ | |
1058 | ptid_t ret; | |
1059 | CORE_ADDR tmp_pc; | |
1060 | ||
1061 | while (1) | |
1062 | { | |
1063 | ret = record_beneath_to_wait (record_beneath_to_wait_ops, | |
90092760 | 1064 | ptid, status, options); |
69d05d38 | 1065 | |
8b739a96 | 1066 | /* Is this a SIGTRAP? */ |
69d05d38 HZ |
1067 | if (status->kind == TARGET_WAITKIND_STOPPED |
1068 | && status->value.sig == TARGET_SIGNAL_TRAP) | |
1069 | { | |
6c95b8df PA |
1070 | struct regcache *regcache; |
1071 | ||
8b739a96 | 1072 | /* Yes -- check if there is a breakpoint. */ |
69d05d38 | 1073 | registers_changed (); |
6c95b8df PA |
1074 | regcache = get_current_regcache (); |
1075 | tmp_pc = regcache_read_pc (regcache); | |
1076 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
1077 | tmp_pc)) | |
69d05d38 | 1078 | { |
8b739a96 | 1079 | /* There is a breakpoint. GDB will want to stop. */ |
6c95b8df PA |
1080 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
1081 | CORE_ADDR decr_pc_after_break | |
1082 | = gdbarch_decr_pc_after_break (gdbarch); | |
69d05d38 | 1083 | if (decr_pc_after_break) |
6c95b8df PA |
1084 | regcache_write_pc (regcache, |
1085 | tmp_pc + decr_pc_after_break); | |
69d05d38 HZ |
1086 | } |
1087 | else | |
1088 | { | |
8b739a96 HZ |
1089 | /* There is not a breakpoint, and gdb is not |
1090 | stepping, therefore gdb will not stop. | |
1091 | Therefore we will not return to gdb. | |
1092 | Record the insn and resume. */ | |
6c95b8df PA |
1093 | if (!do_record_message (regcache, TARGET_SIGNAL_0)) |
1094 | break; | |
1095 | ||
69d05d38 HZ |
1096 | record_beneath_to_resume (record_beneath_to_resume_ops, |
1097 | ptid, 1, | |
88fef440 | 1098 | TARGET_SIGNAL_0); |
69d05d38 HZ |
1099 | continue; |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* The inferior is broken by a breakpoint or a signal. */ | |
1104 | break; | |
1105 | } | |
1106 | ||
1107 | return ret; | |
1108 | } | |
1109 | } | |
1110 | else | |
1111 | { | |
1112 | struct regcache *regcache = get_current_regcache (); | |
5af949e3 | 1113 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
69d05d38 HZ |
1114 | int continue_flag = 1; |
1115 | int first_record_end = 1; | |
1116 | struct cleanup *old_cleanups = make_cleanup (record_wait_cleanups, 0); | |
1117 | CORE_ADDR tmp_pc; | |
1118 | ||
1119 | status->kind = TARGET_WAITKIND_STOPPED; | |
1120 | ||
1121 | /* Check breakpoint when forward execute. */ | |
1122 | if (execution_direction == EXEC_FORWARD) | |
1123 | { | |
1124 | tmp_pc = regcache_read_pc (regcache); | |
6c95b8df PA |
1125 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), |
1126 | tmp_pc)) | |
69d05d38 HZ |
1127 | { |
1128 | if (record_debug) | |
1129 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
1130 | "Process record: break at %s.\n", |
1131 | paddress (gdbarch, tmp_pc)); | |
1132 | if (gdbarch_decr_pc_after_break (gdbarch) | |
69d05d38 HZ |
1133 | && !record_resume_step) |
1134 | regcache_write_pc (regcache, | |
1135 | tmp_pc + | |
5af949e3 | 1136 | gdbarch_decr_pc_after_break (gdbarch)); |
69d05d38 HZ |
1137 | goto replay_out; |
1138 | } | |
1139 | } | |
1140 | ||
1141 | record_get_sig = 0; | |
1142 | signal (SIGINT, record_sig_handler); | |
1143 | /* If GDB is in terminal_inferior mode, it will not get the signal. | |
1144 | And in GDB replay mode, GDB doesn't need to be in terminal_inferior | |
1145 | mode, because inferior will not executed. | |
1146 | Then set it to terminal_ours to make GDB get the signal. */ | |
1147 | target_terminal_ours (); | |
1148 | ||
1149 | /* In EXEC_FORWARD mode, record_list points to the tail of prev | |
1150 | instruction. */ | |
1151 | if (execution_direction == EXEC_FORWARD && record_list->next) | |
1152 | record_list = record_list->next; | |
1153 | ||
1154 | /* Loop over the record_list, looking for the next place to | |
1155 | stop. */ | |
1156 | do | |
1157 | { | |
1158 | /* Check for beginning and end of log. */ | |
1159 | if (execution_direction == EXEC_REVERSE | |
1160 | && record_list == &record_first) | |
1161 | { | |
1162 | /* Hit beginning of record log in reverse. */ | |
1163 | status->kind = TARGET_WAITKIND_NO_HISTORY; | |
1164 | break; | |
1165 | } | |
1166 | if (execution_direction != EXEC_REVERSE && !record_list->next) | |
1167 | { | |
1168 | /* Hit end of record log going forward. */ | |
1169 | status->kind = TARGET_WAITKIND_NO_HISTORY; | |
1170 | break; | |
1171 | } | |
1172 | ||
90ca0479 MS |
1173 | record_exec_insn (regcache, gdbarch, record_list); |
1174 | ||
1175 | if (record_list->type == record_end) | |
69d05d38 HZ |
1176 | { |
1177 | if (record_debug > 1) | |
1178 | fprintf_unfiltered (gdb_stdlog, | |
1179 | "Process record: record_end %s to " | |
1180 | "inferior.\n", | |
1181 | host_address_to_string (record_list)); | |
1182 | ||
1183 | if (first_record_end && execution_direction == EXEC_REVERSE) | |
1184 | { | |
1185 | /* When reverse excute, the first record_end is the part of | |
1186 | current instruction. */ | |
1187 | first_record_end = 0; | |
1188 | } | |
1189 | else | |
1190 | { | |
1191 | /* In EXEC_REVERSE mode, this is the record_end of prev | |
1192 | instruction. | |
1193 | In EXEC_FORWARD mode, this is the record_end of current | |
1194 | instruction. */ | |
1195 | /* step */ | |
1196 | if (record_resume_step) | |
1197 | { | |
1198 | if (record_debug > 1) | |
1199 | fprintf_unfiltered (gdb_stdlog, | |
1200 | "Process record: step.\n"); | |
1201 | continue_flag = 0; | |
1202 | } | |
1203 | ||
1204 | /* check breakpoint */ | |
1205 | tmp_pc = regcache_read_pc (regcache); | |
6c95b8df PA |
1206 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), |
1207 | tmp_pc)) | |
69d05d38 HZ |
1208 | { |
1209 | if (record_debug) | |
1210 | fprintf_unfiltered (gdb_stdlog, | |
1211 | "Process record: break " | |
5af949e3 UW |
1212 | "at %s.\n", |
1213 | paddress (gdbarch, tmp_pc)); | |
1214 | if (gdbarch_decr_pc_after_break (gdbarch) | |
69d05d38 HZ |
1215 | && execution_direction == EXEC_FORWARD |
1216 | && !record_resume_step) | |
1217 | regcache_write_pc (regcache, | |
1218 | tmp_pc + | |
5af949e3 | 1219 | gdbarch_decr_pc_after_break (gdbarch)); |
69d05d38 HZ |
1220 | continue_flag = 0; |
1221 | } | |
8b739a96 HZ |
1222 | /* Check target signal */ |
1223 | if (record_list->u.end.sigval != TARGET_SIGNAL_0) | |
1224 | /* FIXME: better way to check */ | |
1225 | continue_flag = 0; | |
69d05d38 HZ |
1226 | } |
1227 | } | |
1228 | ||
1229 | if (continue_flag) | |
1230 | { | |
1231 | if (execution_direction == EXEC_REVERSE) | |
1232 | { | |
1233 | if (record_list->prev) | |
1234 | record_list = record_list->prev; | |
1235 | } | |
1236 | else | |
1237 | { | |
1238 | if (record_list->next) | |
1239 | record_list = record_list->next; | |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | while (continue_flag); | |
1244 | ||
1245 | signal (SIGINT, handle_sigint); | |
1246 | ||
1247 | replay_out: | |
1248 | if (record_get_sig) | |
1249 | status->value.sig = TARGET_SIGNAL_INT; | |
8b739a96 HZ |
1250 | else if (record_list->u.end.sigval != TARGET_SIGNAL_0) |
1251 | /* FIXME: better way to check */ | |
1252 | status->value.sig = record_list->u.end.sigval; | |
69d05d38 HZ |
1253 | else |
1254 | status->value.sig = TARGET_SIGNAL_TRAP; | |
1255 | ||
1256 | discard_cleanups (old_cleanups); | |
1257 | } | |
1258 | ||
1259 | do_cleanups (set_cleanups); | |
1260 | return inferior_ptid; | |
1261 | } | |
1262 | ||
6df67667 MS |
1263 | /* "to_disconnect" method for process record target. */ |
1264 | ||
69d05d38 HZ |
1265 | static void |
1266 | record_disconnect (struct target_ops *target, char *args, int from_tty) | |
1267 | { | |
1268 | if (record_debug) | |
1269 | fprintf_unfiltered (gdb_stdlog, "Process record: record_disconnect\n"); | |
1270 | ||
1271 | unpush_target (&record_ops); | |
1272 | target_disconnect (args, from_tty); | |
1273 | } | |
1274 | ||
6df67667 MS |
1275 | /* "to_detach" method for process record target. */ |
1276 | ||
69d05d38 HZ |
1277 | static void |
1278 | record_detach (struct target_ops *ops, char *args, int from_tty) | |
1279 | { | |
1280 | if (record_debug) | |
1281 | fprintf_unfiltered (gdb_stdlog, "Process record: record_detach\n"); | |
1282 | ||
1283 | unpush_target (&record_ops); | |
1284 | target_detach (args, from_tty); | |
1285 | } | |
1286 | ||
6df67667 MS |
1287 | /* "to_mourn_inferior" method for process record target. */ |
1288 | ||
69d05d38 HZ |
1289 | static void |
1290 | record_mourn_inferior (struct target_ops *ops) | |
1291 | { | |
1292 | if (record_debug) | |
1293 | fprintf_unfiltered (gdb_stdlog, "Process record: " | |
1294 | "record_mourn_inferior\n"); | |
1295 | ||
1296 | unpush_target (&record_ops); | |
1297 | target_mourn_inferior (); | |
1298 | } | |
1299 | ||
1300 | /* Close process record target before killing the inferior process. */ | |
1301 | ||
1302 | static void | |
1303 | record_kill (struct target_ops *ops) | |
1304 | { | |
1305 | if (record_debug) | |
1306 | fprintf_unfiltered (gdb_stdlog, "Process record: record_kill\n"); | |
1307 | ||
1308 | unpush_target (&record_ops); | |
1309 | target_kill (); | |
1310 | } | |
1311 | ||
1312 | /* Record registers change (by user or by GDB) to list as an instruction. */ | |
1313 | ||
1314 | static void | |
1315 | record_registers_change (struct regcache *regcache, int regnum) | |
1316 | { | |
1317 | /* Check record_insn_num. */ | |
1318 | record_check_insn_num (0); | |
1319 | ||
1320 | record_arch_list_head = NULL; | |
1321 | record_arch_list_tail = NULL; | |
1322 | ||
1323 | if (regnum < 0) | |
1324 | { | |
1325 | int i; | |
1326 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) | |
1327 | { | |
1328 | if (record_arch_list_add_reg (regcache, i)) | |
1329 | { | |
1330 | record_list_release (record_arch_list_tail); | |
1331 | error (_("Process record: failed to record execution log.")); | |
1332 | } | |
1333 | } | |
1334 | } | |
1335 | else | |
1336 | { | |
1337 | if (record_arch_list_add_reg (regcache, regnum)) | |
1338 | { | |
1339 | record_list_release (record_arch_list_tail); | |
1340 | error (_("Process record: failed to record execution log.")); | |
1341 | } | |
1342 | } | |
1343 | if (record_arch_list_add_end ()) | |
1344 | { | |
1345 | record_list_release (record_arch_list_tail); | |
1346 | error (_("Process record: failed to record execution log.")); | |
1347 | } | |
1348 | record_list->next = record_arch_list_head; | |
1349 | record_arch_list_head->prev = record_list; | |
1350 | record_list = record_arch_list_tail; | |
1351 | ||
1352 | if (record_insn_num == record_insn_max_num && record_insn_max_num) | |
1353 | record_list_release_first (); | |
1354 | else | |
1355 | record_insn_num++; | |
1356 | } | |
1357 | ||
6df67667 MS |
1358 | /* "to_store_registers" method for process record target. */ |
1359 | ||
69d05d38 HZ |
1360 | static void |
1361 | record_store_registers (struct target_ops *ops, struct regcache *regcache, | |
1362 | int regno) | |
1363 | { | |
1364 | if (!record_gdb_operation_disable) | |
1365 | { | |
1366 | if (RECORD_IS_REPLAY) | |
1367 | { | |
1368 | int n; | |
69d05d38 HZ |
1369 | |
1370 | /* Let user choose if he wants to write register or not. */ | |
1371 | if (regno < 0) | |
1372 | n = | |
604ad007 JB |
1373 | query (_("Because GDB is in replay mode, changing the " |
1374 | "value of a register will make the execution " | |
1375 | "log unusable from this point onward. " | |
1376 | "Change all registers?")); | |
69d05d38 HZ |
1377 | else |
1378 | n = | |
604ad007 JB |
1379 | query (_("Because GDB is in replay mode, changing the value " |
1380 | "of a register will make the execution log unusable " | |
1381 | "from this point onward. Change register %s?"), | |
69d05d38 HZ |
1382 | gdbarch_register_name (get_regcache_arch (regcache), |
1383 | regno)); | |
1384 | ||
1385 | if (!n) | |
1386 | { | |
1387 | /* Invalidate the value of regcache that was set in function | |
1388 | "regcache_raw_write". */ | |
1389 | if (regno < 0) | |
1390 | { | |
1391 | int i; | |
1392 | for (i = 0; | |
1393 | i < gdbarch_num_regs (get_regcache_arch (regcache)); | |
1394 | i++) | |
1395 | regcache_invalidate (regcache, i); | |
1396 | } | |
1397 | else | |
1398 | regcache_invalidate (regcache, regno); | |
1399 | ||
1400 | error (_("Process record canceled the operation.")); | |
1401 | } | |
1402 | ||
1403 | /* Destroy the record from here forward. */ | |
61f75dd8 | 1404 | record_list_release_following (record_list); |
69d05d38 HZ |
1405 | } |
1406 | ||
1407 | record_registers_change (regcache, regno); | |
1408 | } | |
1409 | record_beneath_to_store_registers (record_beneath_to_store_registers_ops, | |
1410 | regcache, regno); | |
1411 | } | |
1412 | ||
27699eea | 1413 | /* "to_xfer_partial" method. Behavior is conditional on RECORD_IS_REPLAY. |
69d05d38 HZ |
1414 | In replay mode, we cannot write memory unles we are willing to |
1415 | invalidate the record/replay log from this point forward. */ | |
1416 | ||
1417 | static LONGEST | |
1418 | record_xfer_partial (struct target_ops *ops, enum target_object object, | |
1419 | const char *annex, gdb_byte *readbuf, | |
1420 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
1421 | { | |
1422 | if (!record_gdb_operation_disable | |
1423 | && (object == TARGET_OBJECT_MEMORY | |
1424 | || object == TARGET_OBJECT_RAW_MEMORY) && writebuf) | |
1425 | { | |
1426 | if (RECORD_IS_REPLAY) | |
1427 | { | |
1428 | /* Let user choose if he wants to write memory or not. */ | |
604ad007 JB |
1429 | if (!query (_("Because GDB is in replay mode, writing to memory " |
1430 | "will make the execution log unusable from this " | |
1431 | "point onward. Write memory at address %s?"), | |
5af949e3 | 1432 | paddress (target_gdbarch, offset))) |
9a9dc473 | 1433 | error (_("Process record canceled the operation.")); |
69d05d38 HZ |
1434 | |
1435 | /* Destroy the record from here forward. */ | |
61f75dd8 | 1436 | record_list_release_following (record_list); |
69d05d38 HZ |
1437 | } |
1438 | ||
1439 | /* Check record_insn_num */ | |
1440 | record_check_insn_num (0); | |
1441 | ||
1442 | /* Record registers change to list as an instruction. */ | |
1443 | record_arch_list_head = NULL; | |
1444 | record_arch_list_tail = NULL; | |
1445 | if (record_arch_list_add_mem (offset, len)) | |
1446 | { | |
1447 | record_list_release (record_arch_list_tail); | |
1448 | if (record_debug) | |
1449 | fprintf_unfiltered (gdb_stdlog, | |
0156b218 MS |
1450 | "Process record: failed to record " |
1451 | "execution log."); | |
69d05d38 HZ |
1452 | return -1; |
1453 | } | |
1454 | if (record_arch_list_add_end ()) | |
1455 | { | |
1456 | record_list_release (record_arch_list_tail); | |
1457 | if (record_debug) | |
1458 | fprintf_unfiltered (gdb_stdlog, | |
0156b218 MS |
1459 | "Process record: failed to record " |
1460 | "execution log."); | |
69d05d38 HZ |
1461 | return -1; |
1462 | } | |
1463 | record_list->next = record_arch_list_head; | |
1464 | record_arch_list_head->prev = record_list; | |
1465 | record_list = record_arch_list_tail; | |
1466 | ||
1467 | if (record_insn_num == record_insn_max_num && record_insn_max_num) | |
1468 | record_list_release_first (); | |
1469 | else | |
1470 | record_insn_num++; | |
1471 | } | |
1472 | ||
1473 | return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops, | |
1474 | object, annex, readbuf, writebuf, | |
1475 | offset, len); | |
1476 | } | |
1477 | ||
1478 | /* Behavior is conditional on RECORD_IS_REPLAY. | |
1479 | We will not actually insert or remove breakpoints when replaying, | |
1480 | nor when recording. */ | |
1481 | ||
1482 | static int | |
a6d9a66e UW |
1483 | record_insert_breakpoint (struct gdbarch *gdbarch, |
1484 | struct bp_target_info *bp_tgt) | |
69d05d38 HZ |
1485 | { |
1486 | if (!RECORD_IS_REPLAY) | |
1487 | { | |
1488 | struct cleanup *old_cleanups = record_gdb_operation_disable_set (); | |
a6d9a66e | 1489 | int ret = record_beneath_to_insert_breakpoint (gdbarch, bp_tgt); |
69d05d38 HZ |
1490 | |
1491 | do_cleanups (old_cleanups); | |
1492 | ||
1493 | return ret; | |
1494 | } | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
6df67667 MS |
1499 | /* "to_remove_breakpoint" method for process record target. */ |
1500 | ||
69d05d38 | 1501 | static int |
a6d9a66e UW |
1502 | record_remove_breakpoint (struct gdbarch *gdbarch, |
1503 | struct bp_target_info *bp_tgt) | |
69d05d38 HZ |
1504 | { |
1505 | if (!RECORD_IS_REPLAY) | |
1506 | { | |
1507 | struct cleanup *old_cleanups = record_gdb_operation_disable_set (); | |
a6d9a66e | 1508 | int ret = record_beneath_to_remove_breakpoint (gdbarch, bp_tgt); |
69d05d38 HZ |
1509 | |
1510 | do_cleanups (old_cleanups); | |
1511 | ||
1512 | return ret; | |
1513 | } | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
6df67667 | 1518 | /* "to_can_execute_reverse" method for process record target. */ |
27699eea | 1519 | |
69d05d38 HZ |
1520 | static int |
1521 | record_can_execute_reverse (void) | |
1522 | { | |
1523 | return 1; | |
1524 | } | |
1525 | ||
6b04bdb7 MS |
1526 | /* "to_get_bookmark" method for process record and prec over core. */ |
1527 | ||
1528 | static gdb_byte * | |
1529 | record_get_bookmark (char *args, int from_tty) | |
1530 | { | |
1531 | gdb_byte *ret = NULL; | |
1532 | ||
1533 | /* Return stringified form of instruction count. */ | |
1534 | if (record_list && record_list->type == record_end) | |
1535 | ret = xstrdup (pulongest (record_list->u.end.insn_num)); | |
1536 | ||
1537 | if (record_debug) | |
1538 | { | |
1539 | if (ret) | |
1540 | fprintf_unfiltered (gdb_stdlog, | |
1541 | "record_get_bookmark returns %s\n", ret); | |
1542 | else | |
1543 | fprintf_unfiltered (gdb_stdlog, | |
1544 | "record_get_bookmark returns NULL\n"); | |
1545 | } | |
1546 | return ret; | |
1547 | } | |
1548 | ||
1549 | /* The implementation of the command "record goto". */ | |
1550 | static void cmd_record_goto (char *, int); | |
1551 | ||
1552 | /* "to_goto_bookmark" method for process record and prec over core. */ | |
1553 | ||
1554 | static void | |
1555 | record_goto_bookmark (gdb_byte *bookmark, int from_tty) | |
1556 | { | |
1557 | if (record_debug) | |
1558 | fprintf_unfiltered (gdb_stdlog, | |
1559 | "record_goto_bookmark receives %s\n", bookmark); | |
1560 | ||
1561 | if (bookmark[0] == '\'' || bookmark[0] == '\"') | |
1562 | { | |
1563 | if (bookmark[strlen (bookmark) - 1] != bookmark[0]) | |
1564 | error (_("Unbalanced quotes: %s"), bookmark); | |
1565 | ||
1566 | /* Strip trailing quote. */ | |
1567 | bookmark[strlen (bookmark) - 1] = '\0'; | |
1568 | /* Strip leading quote. */ | |
1569 | bookmark++; | |
1570 | /* Pass along to cmd_record_goto. */ | |
1571 | } | |
1572 | ||
1573 | cmd_record_goto ((char *) bookmark, from_tty); | |
1574 | return; | |
1575 | } | |
1576 | ||
69d05d38 HZ |
1577 | static void |
1578 | init_record_ops (void) | |
1579 | { | |
1580 | record_ops.to_shortname = "record"; | |
1581 | record_ops.to_longname = "Process record and replay target"; | |
1582 | record_ops.to_doc = | |
1583 | "Log program while executing and replay execution from log."; | |
1584 | record_ops.to_open = record_open; | |
1585 | record_ops.to_close = record_close; | |
1586 | record_ops.to_resume = record_resume; | |
1587 | record_ops.to_wait = record_wait; | |
1588 | record_ops.to_disconnect = record_disconnect; | |
1589 | record_ops.to_detach = record_detach; | |
1590 | record_ops.to_mourn_inferior = record_mourn_inferior; | |
1591 | record_ops.to_kill = record_kill; | |
1592 | record_ops.to_create_inferior = find_default_create_inferior; | |
1593 | record_ops.to_store_registers = record_store_registers; | |
1594 | record_ops.to_xfer_partial = record_xfer_partial; | |
1595 | record_ops.to_insert_breakpoint = record_insert_breakpoint; | |
1596 | record_ops.to_remove_breakpoint = record_remove_breakpoint; | |
1597 | record_ops.to_can_execute_reverse = record_can_execute_reverse; | |
1598 | record_ops.to_stratum = record_stratum; | |
6b04bdb7 MS |
1599 | /* Add bookmark target methods. */ |
1600 | record_ops.to_get_bookmark = record_get_bookmark; | |
1601 | record_ops.to_goto_bookmark = record_goto_bookmark; | |
69d05d38 HZ |
1602 | record_ops.to_magic = OPS_MAGIC; |
1603 | } | |
1604 | ||
27699eea MS |
1605 | /* "to_resume" method for prec over corefile. */ |
1606 | ||
1607 | static void | |
1608 | record_core_resume (struct target_ops *ops, ptid_t ptid, int step, | |
1609 | enum target_signal signal) | |
1610 | { | |
1611 | record_resume_step = step; | |
1612 | } | |
1613 | ||
1614 | /* "to_kill" method for prec over corefile. */ | |
1615 | ||
1616 | static void | |
1617 | record_core_kill (struct target_ops *ops) | |
1618 | { | |
1619 | if (record_debug) | |
1620 | fprintf_unfiltered (gdb_stdlog, "Process record: record_core_kill\n"); | |
1621 | ||
1622 | unpush_target (&record_core_ops); | |
1623 | } | |
1624 | ||
1625 | /* "to_fetch_registers" method for prec over corefile. */ | |
1626 | ||
1627 | static void | |
1628 | record_core_fetch_registers (struct target_ops *ops, | |
1629 | struct regcache *regcache, | |
1630 | int regno) | |
1631 | { | |
1632 | if (regno < 0) | |
1633 | { | |
1634 | int num = gdbarch_num_regs (get_regcache_arch (regcache)); | |
1635 | int i; | |
1636 | ||
1637 | for (i = 0; i < num; i ++) | |
1638 | regcache_raw_supply (regcache, i, | |
1639 | record_core_regbuf + MAX_REGISTER_SIZE * i); | |
1640 | } | |
1641 | else | |
1642 | regcache_raw_supply (regcache, regno, | |
1643 | record_core_regbuf + MAX_REGISTER_SIZE * regno); | |
1644 | } | |
1645 | ||
1646 | /* "to_prepare_to_store" method for prec over corefile. */ | |
1647 | ||
1648 | static void | |
1649 | record_core_prepare_to_store (struct regcache *regcache) | |
1650 | { | |
1651 | } | |
1652 | ||
1653 | /* "to_store_registers" method for prec over corefile. */ | |
1654 | ||
1655 | static void | |
1656 | record_core_store_registers (struct target_ops *ops, | |
1657 | struct regcache *regcache, | |
1658 | int regno) | |
1659 | { | |
1660 | if (record_gdb_operation_disable) | |
1661 | regcache_raw_collect (regcache, regno, | |
1662 | record_core_regbuf + MAX_REGISTER_SIZE * regno); | |
1663 | else | |
1664 | error (_("You can't do that without a process to debug.")); | |
1665 | } | |
1666 | ||
1667 | /* "to_xfer_partial" method for prec over corefile. */ | |
1668 | ||
1669 | static LONGEST | |
1670 | record_core_xfer_partial (struct target_ops *ops, enum target_object object, | |
1671 | const char *annex, gdb_byte *readbuf, | |
1672 | const gdb_byte *writebuf, ULONGEST offset, | |
1673 | LONGEST len) | |
1674 | { | |
1675 | if (object == TARGET_OBJECT_MEMORY) | |
1676 | { | |
1677 | if (record_gdb_operation_disable || !writebuf) | |
1678 | { | |
1679 | struct target_section *p; | |
1680 | for (p = record_core_start; p < record_core_end; p++) | |
1681 | { | |
1682 | if (offset >= p->addr) | |
1683 | { | |
1684 | struct record_core_buf_entry *entry; | |
bcbfd759 | 1685 | ULONGEST sec_offset; |
27699eea MS |
1686 | |
1687 | if (offset >= p->endaddr) | |
1688 | continue; | |
1689 | ||
1690 | if (offset + len > p->endaddr) | |
1691 | len = p->endaddr - offset; | |
1692 | ||
bcbfd759 | 1693 | sec_offset = offset - p->addr; |
27699eea MS |
1694 | |
1695 | /* Read readbuf or write writebuf p, offset, len. */ | |
1696 | /* Check flags. */ | |
1697 | if (p->the_bfd_section->flags & SEC_CONSTRUCTOR | |
1698 | || (p->the_bfd_section->flags & SEC_HAS_CONTENTS) == 0) | |
1699 | { | |
1700 | if (readbuf) | |
1701 | memset (readbuf, 0, len); | |
1702 | return len; | |
1703 | } | |
1704 | /* Get record_core_buf_entry. */ | |
1705 | for (entry = record_core_buf_list; entry; | |
1706 | entry = entry->prev) | |
1707 | if (entry->p == p) | |
1708 | break; | |
1709 | if (writebuf) | |
1710 | { | |
1711 | if (!entry) | |
1712 | { | |
1713 | /* Add a new entry. */ | |
1714 | entry | |
1715 | = (struct record_core_buf_entry *) | |
1716 | xmalloc | |
1717 | (sizeof (struct record_core_buf_entry)); | |
1718 | entry->p = p; | |
1719 | if (!bfd_malloc_and_get_section (p->bfd, | |
1720 | p->the_bfd_section, | |
1721 | &entry->buf)) | |
1722 | { | |
1723 | xfree (entry); | |
1724 | return 0; | |
1725 | } | |
1726 | entry->prev = record_core_buf_list; | |
1727 | record_core_buf_list = entry; | |
1728 | } | |
1729 | ||
bcbfd759 DE |
1730 | memcpy (entry->buf + sec_offset, writebuf, |
1731 | (size_t) len); | |
27699eea MS |
1732 | } |
1733 | else | |
1734 | { | |
1735 | if (!entry) | |
1736 | return record_beneath_to_xfer_partial | |
1737 | (record_beneath_to_xfer_partial_ops, | |
1738 | object, annex, readbuf, writebuf, | |
1739 | offset, len); | |
1740 | ||
bcbfd759 DE |
1741 | memcpy (readbuf, entry->buf + sec_offset, |
1742 | (size_t) len); | |
27699eea MS |
1743 | } |
1744 | ||
1745 | return len; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | return -1; | |
1750 | } | |
1751 | else | |
1752 | error (_("You can't do that without a process to debug.")); | |
1753 | } | |
1754 | ||
1755 | return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops, | |
1756 | object, annex, readbuf, writebuf, | |
1757 | offset, len); | |
1758 | } | |
1759 | ||
1760 | /* "to_insert_breakpoint" method for prec over corefile. */ | |
1761 | ||
1762 | static int | |
1763 | record_core_insert_breakpoint (struct gdbarch *gdbarch, | |
1764 | struct bp_target_info *bp_tgt) | |
1765 | { | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | /* "to_remove_breakpoint" method for prec over corefile. */ | |
1770 | ||
1771 | static int | |
1772 | record_core_remove_breakpoint (struct gdbarch *gdbarch, | |
1773 | struct bp_target_info *bp_tgt) | |
1774 | { | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | /* "to_has_execution" method for prec over corefile. */ | |
1779 | ||
1780 | int | |
1781 | record_core_has_execution (struct target_ops *ops) | |
1782 | { | |
1783 | return 1; | |
1784 | } | |
1785 | ||
1786 | static void | |
1787 | init_record_core_ops (void) | |
1788 | { | |
1789 | record_core_ops.to_shortname = "record_core"; | |
1790 | record_core_ops.to_longname = "Process record and replay target"; | |
1791 | record_core_ops.to_doc = | |
1792 | "Log program while executing and replay execution from log."; | |
1793 | record_core_ops.to_open = record_open; | |
1794 | record_core_ops.to_close = record_close; | |
1795 | record_core_ops.to_resume = record_core_resume; | |
1796 | record_core_ops.to_wait = record_wait; | |
1797 | record_core_ops.to_kill = record_core_kill; | |
1798 | record_core_ops.to_fetch_registers = record_core_fetch_registers; | |
1799 | record_core_ops.to_prepare_to_store = record_core_prepare_to_store; | |
1800 | record_core_ops.to_store_registers = record_core_store_registers; | |
1801 | record_core_ops.to_xfer_partial = record_core_xfer_partial; | |
1802 | record_core_ops.to_insert_breakpoint = record_core_insert_breakpoint; | |
1803 | record_core_ops.to_remove_breakpoint = record_core_remove_breakpoint; | |
1804 | record_core_ops.to_can_execute_reverse = record_can_execute_reverse; | |
1805 | record_core_ops.to_has_execution = record_core_has_execution; | |
1806 | record_core_ops.to_stratum = record_stratum; | |
6b04bdb7 MS |
1807 | /* Add bookmark target methods. */ |
1808 | record_core_ops.to_get_bookmark = record_get_bookmark; | |
1809 | record_core_ops.to_goto_bookmark = record_goto_bookmark; | |
27699eea MS |
1810 | record_core_ops.to_magic = OPS_MAGIC; |
1811 | } | |
1812 | ||
6df67667 MS |
1813 | /* Implement "show record debug" command. */ |
1814 | ||
69d05d38 HZ |
1815 | static void |
1816 | show_record_debug (struct ui_file *file, int from_tty, | |
1817 | struct cmd_list_element *c, const char *value) | |
1818 | { | |
1819 | fprintf_filtered (file, _("Debugging of process record target is %s.\n"), | |
1820 | value); | |
1821 | } | |
1822 | ||
1823 | /* Alias for "target record". */ | |
1824 | ||
1825 | static void | |
1826 | cmd_record_start (char *args, int from_tty) | |
1827 | { | |
1828 | execute_command ("target record", from_tty); | |
1829 | } | |
1830 | ||
1831 | /* Truncate the record log from the present point | |
1832 | of replay until the end. */ | |
1833 | ||
1834 | static void | |
1835 | cmd_record_delete (char *args, int from_tty) | |
1836 | { | |
1837 | if (current_target.to_stratum == record_stratum) | |
1838 | { | |
1839 | if (RECORD_IS_REPLAY) | |
1840 | { | |
1841 | if (!from_tty || query (_("Delete the log from this point forward " | |
1842 | "and begin to record the running message " | |
1843 | "at current PC?"))) | |
61f75dd8 | 1844 | record_list_release_following (record_list); |
69d05d38 HZ |
1845 | } |
1846 | else | |
1847 | printf_unfiltered (_("Already at end of record list.\n")); | |
1848 | ||
1849 | } | |
1850 | else | |
1851 | printf_unfiltered (_("Process record is not started.\n")); | |
1852 | } | |
1853 | ||
6df67667 | 1854 | /* Implement the "stoprecord" or "record stop" command. */ |
69d05d38 HZ |
1855 | |
1856 | static void | |
1857 | cmd_record_stop (char *args, int from_tty) | |
1858 | { | |
1859 | if (current_target.to_stratum == record_stratum) | |
1860 | { | |
5d40bb85 | 1861 | unpush_target (&record_ops); |
b54295a7 MS |
1862 | printf_unfiltered (_("Process record is stopped and all execution " |
1863 | "logs are deleted.\n")); | |
69d05d38 HZ |
1864 | } |
1865 | else | |
1866 | printf_unfiltered (_("Process record is not started.\n")); | |
1867 | } | |
1868 | ||
1869 | /* Set upper limit of record log size. */ | |
1870 | ||
1871 | static void | |
1872 | set_record_insn_max_num (char *args, int from_tty, struct cmd_list_element *c) | |
1873 | { | |
1874 | if (record_insn_num > record_insn_max_num && record_insn_max_num) | |
1875 | { | |
265aad34 | 1876 | /* Count down record_insn_num while releasing records from list. */ |
69d05d38 | 1877 | while (record_insn_num > record_insn_max_num) |
265aad34 MS |
1878 | { |
1879 | record_list_release_first (); | |
1880 | record_insn_num--; | |
1881 | } | |
69d05d38 HZ |
1882 | } |
1883 | } | |
1884 | ||
69d05d38 HZ |
1885 | static struct cmd_list_element *record_cmdlist, *set_record_cmdlist, |
1886 | *show_record_cmdlist, *info_record_cmdlist; | |
1887 | ||
1888 | static void | |
1889 | set_record_command (char *args, int from_tty) | |
1890 | { | |
1891 | printf_unfiltered (_("\ | |
1892 | \"set record\" must be followed by an apporpriate subcommand.\n")); | |
1893 | help_list (set_record_cmdlist, "set record ", all_commands, gdb_stdout); | |
1894 | } | |
1895 | ||
1896 | static void | |
1897 | show_record_command (char *args, int from_tty) | |
1898 | { | |
1899 | cmd_show_list (show_record_cmdlist, from_tty, ""); | |
1900 | } | |
1901 | ||
b54295a7 MS |
1902 | /* Display some statistics about the execution log. */ |
1903 | ||
69d05d38 HZ |
1904 | static void |
1905 | info_record_command (char *args, int from_tty) | |
1906 | { | |
b54295a7 MS |
1907 | struct record_entry *p; |
1908 | ||
1909 | if (current_target.to_stratum == record_stratum) | |
1910 | { | |
1911 | if (RECORD_IS_REPLAY) | |
1912 | printf_filtered (_("Replay mode:\n")); | |
1913 | else | |
1914 | printf_filtered (_("Record mode:\n")); | |
1915 | ||
1916 | /* Find entry for first actual instruction in the log. */ | |
1917 | for (p = record_first.next; | |
1918 | p != NULL && p->type != record_end; | |
1919 | p = p->next) | |
1920 | ; | |
1921 | ||
1922 | /* Do we have a log at all? */ | |
1923 | if (p != NULL && p->type == record_end) | |
1924 | { | |
1925 | /* Display instruction number for first instruction in the log. */ | |
1926 | printf_filtered (_("Lowest recorded instruction number is %s.\n"), | |
1927 | pulongest (p->u.end.insn_num)); | |
1928 | ||
1929 | /* If in replay mode, display where we are in the log. */ | |
1930 | if (RECORD_IS_REPLAY) | |
1931 | printf_filtered (_("Current instruction number is %s.\n"), | |
1932 | pulongest (record_list->u.end.insn_num)); | |
1933 | ||
1934 | /* Display instruction number for last instruction in the log. */ | |
1935 | printf_filtered (_("Highest recorded instruction number is %s.\n"), | |
1936 | pulongest (record_insn_count)); | |
1937 | ||
1938 | /* Display log count. */ | |
1939 | printf_filtered (_("Log contains %d instructions.\n"), | |
1940 | record_insn_num); | |
1941 | } | |
1942 | else | |
1943 | { | |
1944 | printf_filtered (_("No instructions have been logged.\n")); | |
1945 | } | |
1946 | } | |
1947 | else | |
1948 | { | |
1949 | printf_filtered (_("target record is not active.\n")); | |
1950 | } | |
1951 | ||
1952 | /* Display max log size. */ | |
1953 | printf_filtered (_("Max logged instructions is %d.\n"), | |
1954 | record_insn_max_num); | |
69d05d38 HZ |
1955 | } |
1956 | ||
0156b218 MS |
1957 | /* Record log save-file format |
1958 | Version 1 (never released) | |
1959 | ||
1960 | Header: | |
1961 | 4 bytes: magic number htonl(0x20090829). | |
1962 | NOTE: be sure to change whenever this file format changes! | |
1963 | ||
1964 | Records: | |
1965 | record_end: | |
1966 | 1 byte: record type (record_end, see enum record_type). | |
1967 | record_reg: | |
1968 | 1 byte: record type (record_reg, see enum record_type). | |
1969 | 8 bytes: register id (network byte order). | |
1970 | MAX_REGISTER_SIZE bytes: register value. | |
1971 | record_mem: | |
1972 | 1 byte: record type (record_mem, see enum record_type). | |
1973 | 8 bytes: memory length (network byte order). | |
1974 | 8 bytes: memory address (network byte order). | |
1975 | n bytes: memory value (n == memory length). | |
1976 | ||
1977 | Version 2 | |
1978 | 4 bytes: magic number netorder32(0x20091016). | |
1979 | NOTE: be sure to change whenever this file format changes! | |
1980 | ||
1981 | Records: | |
1982 | record_end: | |
1983 | 1 byte: record type (record_end, see enum record_type). | |
1984 | 4 bytes: signal | |
1985 | 4 bytes: instruction count | |
1986 | record_reg: | |
1987 | 1 byte: record type (record_reg, see enum record_type). | |
1988 | 4 bytes: register id (network byte order). | |
1989 | n bytes: register value (n == actual register size). | |
1990 | (eg. 4 bytes for x86 general registers). | |
1991 | record_mem: | |
1992 | 1 byte: record type (record_mem, see enum record_type). | |
1993 | 4 bytes: memory length (network byte order). | |
1994 | 8 bytes: memory address (network byte order). | |
1995 | n bytes: memory value (n == memory length). | |
1996 | ||
1997 | */ | |
1998 | ||
1999 | /* bfdcore_read -- read bytes from a core file section. */ | |
2000 | ||
2001 | static inline void | |
2002 | bfdcore_read (bfd *obfd, asection *osec, void *buf, int len, int *offset) | |
2003 | { | |
2004 | int ret = bfd_get_section_contents (obfd, osec, buf, *offset, len); | |
2005 | ||
2006 | if (ret) | |
2007 | *offset += len; | |
2008 | else | |
2009 | error (_("Failed to read %d bytes from core file %s ('%s').\n"), | |
2010 | len, bfd_get_filename (obfd), | |
2011 | bfd_errmsg (bfd_get_error ())); | |
2012 | } | |
2013 | ||
2014 | static inline uint64_t | |
6aa96d03 | 2015 | netorder64 (uint64_t input) |
0156b218 | 2016 | { |
6aa96d03 MS |
2017 | uint64_t ret; |
2018 | ||
2019 | store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret), | |
2020 | BFD_ENDIAN_BIG, input); | |
2021 | return ret; | |
0156b218 MS |
2022 | } |
2023 | ||
2024 | static inline uint32_t | |
6aa96d03 | 2025 | netorder32 (uint32_t input) |
0156b218 | 2026 | { |
6aa96d03 MS |
2027 | uint32_t ret; |
2028 | ||
2029 | store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret), | |
2030 | BFD_ENDIAN_BIG, input); | |
2031 | return ret; | |
0156b218 MS |
2032 | } |
2033 | ||
2034 | static inline uint16_t | |
6aa96d03 | 2035 | netorder16 (uint16_t input) |
0156b218 | 2036 | { |
6aa96d03 MS |
2037 | uint16_t ret; |
2038 | ||
2039 | store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret), | |
2040 | BFD_ENDIAN_BIG, input); | |
2041 | return ret; | |
0156b218 MS |
2042 | } |
2043 | ||
2044 | /* Restore the execution log from a core_bfd file. */ | |
2045 | static void | |
2046 | record_restore (void) | |
2047 | { | |
2048 | uint32_t magic; | |
2049 | struct cleanup *old_cleanups; | |
2050 | struct record_entry *rec; | |
2051 | asection *osec; | |
2052 | uint32_t osec_size; | |
2053 | int bfd_offset = 0; | |
2054 | struct regcache *regcache; | |
2055 | ||
2056 | /* We restore the execution log from the open core bfd, | |
2057 | if there is one. */ | |
2058 | if (core_bfd == NULL) | |
2059 | return; | |
2060 | ||
2061 | /* "record_restore" can only be called when record list is empty. */ | |
2062 | gdb_assert (record_first.next == NULL); | |
2063 | ||
2064 | if (record_debug) | |
07b7cff3 | 2065 | fprintf_unfiltered (gdb_stdlog, "Restoring recording from core file.\n"); |
0156b218 MS |
2066 | |
2067 | /* Now need to find our special note section. */ | |
2068 | osec = bfd_get_section_by_name (core_bfd, "null0"); | |
2069 | osec_size = bfd_section_size (core_bfd, osec); | |
2070 | if (record_debug) | |
07b7cff3 PA |
2071 | fprintf_unfiltered (gdb_stdlog, "Find precord section %s.\n", |
2072 | osec ? "succeeded" : "failed"); | |
2073 | if (osec == NULL) | |
0156b218 MS |
2074 | return; |
2075 | if (record_debug) | |
07b7cff3 | 2076 | fprintf_unfiltered (gdb_stdlog, "%s", bfd_section_name (core_bfd, osec)); |
0156b218 MS |
2077 | |
2078 | /* Check the magic code. */ | |
2079 | bfdcore_read (core_bfd, osec, &magic, sizeof (magic), &bfd_offset); | |
2080 | if (magic != RECORD_FILE_MAGIC) | |
2081 | error (_("Version mis-match or file format error in core file %s."), | |
2082 | bfd_get_filename (core_bfd)); | |
2083 | if (record_debug) | |
07b7cff3 | 2084 | fprintf_unfiltered (gdb_stdlog, "\ |
1de1372d | 2085 | Reading 4-byte magic cookie RECORD_FILE_MAGIC (0x%s)\n", |
07b7cff3 | 2086 | phex_nz (netorder32 (magic), 4)); |
0156b218 MS |
2087 | |
2088 | /* Restore the entries in recfd into record_arch_list_head and | |
2089 | record_arch_list_tail. */ | |
2090 | record_arch_list_head = NULL; | |
2091 | record_arch_list_tail = NULL; | |
2092 | record_insn_num = 0; | |
2093 | old_cleanups = make_cleanup (record_arch_list_cleanups, 0); | |
2094 | regcache = get_current_regcache (); | |
2095 | ||
2096 | while (1) | |
2097 | { | |
2098 | int ret; | |
2099 | uint8_t tmpu8; | |
2100 | uint32_t regnum, len, signal, count; | |
2101 | uint64_t addr; | |
2102 | ||
2103 | /* We are finished when offset reaches osec_size. */ | |
2104 | if (bfd_offset >= osec_size) | |
2105 | break; | |
2106 | bfdcore_read (core_bfd, osec, &tmpu8, sizeof (tmpu8), &bfd_offset); | |
2107 | ||
2108 | switch (tmpu8) | |
2109 | { | |
2110 | case record_reg: /* reg */ | |
2111 | /* Get register number to regnum. */ | |
2112 | bfdcore_read (core_bfd, osec, ®num, | |
2113 | sizeof (regnum), &bfd_offset); | |
2114 | regnum = netorder32 (regnum); | |
2115 | ||
2116 | rec = record_reg_alloc (regcache, regnum); | |
2117 | ||
2118 | /* Get val. */ | |
2119 | bfdcore_read (core_bfd, osec, record_get_loc (rec), | |
2120 | rec->u.reg.len, &bfd_offset); | |
2121 | ||
07b7cff3 PA |
2122 | if (record_debug) |
2123 | fprintf_unfiltered (gdb_stdlog, "\ | |
99ff666f | 2124 | Reading register %d (1 plus %lu plus %d bytes)\n", |
07b7cff3 PA |
2125 | rec->u.reg.num, |
2126 | (unsigned long) sizeof (regnum), | |
2127 | rec->u.reg.len); | |
0156b218 MS |
2128 | break; |
2129 | ||
2130 | case record_mem: /* mem */ | |
2131 | /* Get len. */ | |
2132 | bfdcore_read (core_bfd, osec, &len, | |
2133 | sizeof (len), &bfd_offset); | |
2134 | len = netorder32 (len); | |
2135 | ||
2136 | /* Get addr. */ | |
2137 | bfdcore_read (core_bfd, osec, &addr, | |
2138 | sizeof (addr), &bfd_offset); | |
2139 | addr = netorder64 (addr); | |
2140 | ||
2141 | rec = record_mem_alloc (addr, len); | |
2142 | ||
2143 | /* Get val. */ | |
2144 | bfdcore_read (core_bfd, osec, record_get_loc (rec), | |
2145 | rec->u.mem.len, &bfd_offset); | |
2146 | ||
07b7cff3 PA |
2147 | if (record_debug) |
2148 | fprintf_unfiltered (gdb_stdlog, "\ | |
99ff666f | 2149 | Reading memory %s (1 plus %lu plus %lu plus %d bytes)\n", |
07b7cff3 PA |
2150 | paddress (get_current_arch (), |
2151 | rec->u.mem.addr), | |
2152 | (unsigned long) sizeof (addr), | |
2153 | (unsigned long) sizeof (len), | |
2154 | rec->u.mem.len); | |
0156b218 MS |
2155 | break; |
2156 | ||
2157 | case record_end: /* end */ | |
2158 | rec = record_end_alloc (); | |
2159 | record_insn_num ++; | |
2160 | ||
2161 | /* Get signal value. */ | |
2162 | bfdcore_read (core_bfd, osec, &signal, | |
2163 | sizeof (signal), &bfd_offset); | |
2164 | signal = netorder32 (signal); | |
2165 | rec->u.end.sigval = signal; | |
2166 | ||
2167 | /* Get insn count. */ | |
2168 | bfdcore_read (core_bfd, osec, &count, | |
2169 | sizeof (count), &bfd_offset); | |
2170 | count = netorder32 (count); | |
2171 | rec->u.end.insn_num = count; | |
2172 | record_insn_count = count + 1; | |
07b7cff3 PA |
2173 | if (record_debug) |
2174 | fprintf_unfiltered (gdb_stdlog, "\ | |
99ff666f | 2175 | Reading record_end (1 + %lu + %lu bytes), offset == %s\n", |
07b7cff3 PA |
2176 | (unsigned long) sizeof (signal), |
2177 | (unsigned long) sizeof (count), | |
2178 | paddress (get_current_arch (), | |
2179 | bfd_offset)); | |
0156b218 MS |
2180 | break; |
2181 | ||
2182 | default: | |
2183 | error (_("Bad entry type in core file %s."), | |
2184 | bfd_get_filename (core_bfd)); | |
2185 | break; | |
2186 | } | |
2187 | ||
2188 | /* Add rec to record arch list. */ | |
2189 | record_arch_list_add (rec); | |
2190 | } | |
2191 | ||
2192 | discard_cleanups (old_cleanups); | |
2193 | ||
2194 | /* Add record_arch_list_head to the end of record list. */ | |
2195 | record_first.next = record_arch_list_head; | |
2196 | record_arch_list_head->prev = &record_first; | |
2197 | record_arch_list_tail->next = NULL; | |
2198 | record_list = &record_first; | |
2199 | ||
2200 | /* Update record_insn_max_num. */ | |
2201 | if (record_insn_num > record_insn_max_num) | |
2202 | { | |
2203 | record_insn_max_num = record_insn_num; | |
2204 | warning (_("Auto increase record/replay buffer limit to %d."), | |
2205 | record_insn_max_num); | |
2206 | } | |
2207 | ||
2208 | /* Succeeded. */ | |
2209 | printf_filtered (_("Restored records from core file %s.\n"), | |
2210 | bfd_get_filename (core_bfd)); | |
2211 | ||
2212 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
2213 | } | |
2214 | ||
2215 | /* bfdcore_write -- write bytes into a core file section. */ | |
2216 | ||
2217 | static inline void | |
2218 | bfdcore_write (bfd *obfd, asection *osec, void *buf, int len, int *offset) | |
2219 | { | |
2220 | int ret = bfd_set_section_contents (obfd, osec, buf, *offset, len); | |
2221 | ||
2222 | if (ret) | |
2223 | *offset += len; | |
2224 | else | |
2225 | error (_("Failed to write %d bytes to core file %s ('%s').\n"), | |
2226 | len, bfd_get_filename (obfd), | |
2227 | bfd_errmsg (bfd_get_error ())); | |
2228 | } | |
2229 | ||
2230 | /* Restore the execution log from a file. We use a modified elf | |
2231 | corefile format, with an extra section for our data. */ | |
2232 | ||
2233 | static void | |
2234 | cmd_record_restore (char *args, int from_tty) | |
2235 | { | |
2236 | core_file_command (args, from_tty); | |
2237 | record_open (args, from_tty); | |
2238 | } | |
2239 | ||
2240 | static void | |
2241 | record_save_cleanups (void *data) | |
2242 | { | |
2243 | bfd *obfd = data; | |
2244 | char *pathname = xstrdup (bfd_get_filename (obfd)); | |
2245 | bfd_close (obfd); | |
2246 | unlink (pathname); | |
2247 | xfree (pathname); | |
2248 | } | |
2249 | ||
2250 | /* Save the execution log to a file. We use a modified elf corefile | |
2251 | format, with an extra section for our data. */ | |
2252 | ||
2253 | static void | |
2254 | cmd_record_save (char *args, int from_tty) | |
2255 | { | |
2256 | char *recfilename, recfilename_buffer[40]; | |
2257 | int recfd; | |
2258 | struct record_entry *cur_record_list; | |
2259 | uint32_t magic; | |
2260 | struct regcache *regcache; | |
2261 | struct gdbarch *gdbarch; | |
2262 | struct cleanup *old_cleanups; | |
2263 | struct cleanup *set_cleanups; | |
2264 | bfd *obfd; | |
2265 | int save_size = 0; | |
2266 | asection *osec = NULL; | |
2267 | int bfd_offset = 0; | |
2268 | ||
2269 | if (strcmp (current_target.to_shortname, "record") != 0) | |
2270 | error (_("This command can only be used with target 'record'.\n" | |
2271 | "Use 'target record' first.\n")); | |
2272 | ||
2273 | if (args && *args) | |
2274 | recfilename = args; | |
2275 | else | |
2276 | { | |
2277 | /* Default recfile name is "gdb_record.PID". */ | |
2278 | snprintf (recfilename_buffer, sizeof (recfilename_buffer), | |
2279 | "gdb_record.%d", PIDGET (inferior_ptid)); | |
2280 | recfilename = recfilename_buffer; | |
2281 | } | |
2282 | ||
2283 | /* Open the save file. */ | |
2284 | if (record_debug) | |
07b7cff3 PA |
2285 | fprintf_unfiltered (gdb_stdlog, "Saving execution log to core file '%s'\n", |
2286 | recfilename); | |
0156b218 MS |
2287 | |
2288 | /* Open the output file. */ | |
2289 | obfd = create_gcore_bfd (recfilename); | |
2290 | old_cleanups = make_cleanup (record_save_cleanups, obfd); | |
2291 | ||
2292 | /* Save the current record entry to "cur_record_list". */ | |
2293 | cur_record_list = record_list; | |
2294 | ||
2295 | /* Get the values of regcache and gdbarch. */ | |
2296 | regcache = get_current_regcache (); | |
2297 | gdbarch = get_regcache_arch (regcache); | |
2298 | ||
2299 | /* Disable the GDB operation record. */ | |
2300 | set_cleanups = record_gdb_operation_disable_set (); | |
2301 | ||
2302 | /* Reverse execute to the begin of record list. */ | |
2303 | while (1) | |
2304 | { | |
2305 | /* Check for beginning and end of log. */ | |
2306 | if (record_list == &record_first) | |
2307 | break; | |
2308 | ||
2309 | record_exec_insn (regcache, gdbarch, record_list); | |
2310 | ||
2311 | if (record_list->prev) | |
2312 | record_list = record_list->prev; | |
2313 | } | |
2314 | ||
2315 | /* Compute the size needed for the extra bfd section. */ | |
2316 | save_size = 4; /* magic cookie */ | |
2317 | for (record_list = record_first.next; record_list; | |
2318 | record_list = record_list->next) | |
2319 | switch (record_list->type) | |
2320 | { | |
2321 | case record_end: | |
2322 | save_size += 1 + 4 + 4; | |
2323 | break; | |
2324 | case record_reg: | |
2325 | save_size += 1 + 4 + record_list->u.reg.len; | |
2326 | break; | |
2327 | case record_mem: | |
2328 | save_size += 1 + 4 + 8 + record_list->u.mem.len; | |
2329 | break; | |
2330 | } | |
2331 | ||
2332 | /* Make the new bfd section. */ | |
2333 | osec = bfd_make_section_anyway_with_flags (obfd, "precord", | |
2334 | SEC_HAS_CONTENTS | |
2335 | | SEC_READONLY); | |
2336 | if (osec == NULL) | |
2337 | error (_("Failed to create 'precord' section for corefile %s: %s"), | |
2338 | recfilename, | |
2339 | bfd_errmsg (bfd_get_error ())); | |
2340 | bfd_set_section_size (obfd, osec, save_size); | |
2341 | bfd_set_section_vma (obfd, osec, 0); | |
2342 | bfd_set_section_alignment (obfd, osec, 0); | |
2343 | bfd_section_lma (obfd, osec) = 0; | |
2344 | ||
2345 | /* Save corefile state. */ | |
2346 | write_gcore_file (obfd); | |
2347 | ||
2348 | /* Write out the record log. */ | |
2349 | /* Write the magic code. */ | |
2350 | magic = RECORD_FILE_MAGIC; | |
2351 | if (record_debug) | |
07b7cff3 | 2352 | fprintf_unfiltered (gdb_stdlog, "\ |
1de1372d | 2353 | Writing 4-byte magic cookie RECORD_FILE_MAGIC (0x%s)\n", |
07b7cff3 | 2354 | phex_nz (magic, 4)); |
0156b218 MS |
2355 | bfdcore_write (obfd, osec, &magic, sizeof (magic), &bfd_offset); |
2356 | ||
2357 | /* Save the entries to recfd and forward execute to the end of | |
2358 | record list. */ | |
2359 | record_list = &record_first; | |
2360 | while (1) | |
2361 | { | |
2362 | /* Save entry. */ | |
2363 | if (record_list != &record_first) | |
2364 | { | |
2365 | uint8_t type; | |
2366 | uint32_t regnum, len, signal, count; | |
2367 | uint64_t addr; | |
2368 | ||
2369 | type = record_list->type; | |
2370 | bfdcore_write (obfd, osec, &type, sizeof (type), &bfd_offset); | |
2371 | ||
2372 | switch (record_list->type) | |
2373 | { | |
2374 | case record_reg: /* reg */ | |
07b7cff3 PA |
2375 | if (record_debug) |
2376 | fprintf_unfiltered (gdb_stdlog, "\ | |
99ff666f | 2377 | Writing register %d (1 plus %lu plus %d bytes)\n", |
07b7cff3 PA |
2378 | record_list->u.reg.num, |
2379 | (unsigned long) sizeof (regnum), | |
2380 | record_list->u.reg.len); | |
0156b218 MS |
2381 | |
2382 | /* Write regnum. */ | |
2383 | regnum = netorder32 (record_list->u.reg.num); | |
2384 | bfdcore_write (obfd, osec, ®num, | |
2385 | sizeof (regnum), &bfd_offset); | |
2386 | ||
2387 | /* Write regval. */ | |
2388 | bfdcore_write (obfd, osec, record_get_loc (record_list), | |
2389 | record_list->u.reg.len, &bfd_offset); | |
2390 | break; | |
2391 | ||
2392 | case record_mem: /* mem */ | |
2393 | if (record_debug) | |
07b7cff3 | 2394 | fprintf_unfiltered (gdb_stdlog, "\ |
99ff666f | 2395 | Writing memory %s (1 plus %lu plus %lu plus %d bytes)\n", |
07b7cff3 PA |
2396 | paddress (gdbarch, |
2397 | record_list->u.mem.addr), | |
2398 | (unsigned long) sizeof (addr), | |
2399 | (unsigned long) sizeof (len), | |
2400 | record_list->u.mem.len); | |
0156b218 MS |
2401 | |
2402 | /* Write memlen. */ | |
2403 | len = netorder32 (record_list->u.mem.len); | |
2404 | bfdcore_write (obfd, osec, &len, sizeof (len), &bfd_offset); | |
2405 | ||
2406 | /* Write memaddr. */ | |
2407 | addr = netorder64 (record_list->u.mem.addr); | |
2408 | bfdcore_write (obfd, osec, &addr, | |
2409 | sizeof (addr), &bfd_offset); | |
2410 | ||
2411 | /* Write memval. */ | |
2412 | bfdcore_write (obfd, osec, record_get_loc (record_list), | |
2413 | record_list->u.mem.len, &bfd_offset); | |
2414 | break; | |
2415 | ||
2416 | case record_end: | |
07b7cff3 PA |
2417 | if (record_debug) |
2418 | fprintf_unfiltered (gdb_stdlog, "\ | |
99ff666f | 2419 | Writing record_end (1 + %lu + %lu bytes)\n", |
07b7cff3 PA |
2420 | (unsigned long) sizeof (signal), |
2421 | (unsigned long) sizeof (count)); | |
0156b218 MS |
2422 | /* Write signal value. */ |
2423 | signal = netorder32 (record_list->u.end.sigval); | |
2424 | bfdcore_write (obfd, osec, &signal, | |
2425 | sizeof (signal), &bfd_offset); | |
2426 | ||
2427 | /* Write insn count. */ | |
2428 | count = netorder32 (record_list->u.end.insn_num); | |
2429 | bfdcore_write (obfd, osec, &count, | |
2430 | sizeof (count), &bfd_offset); | |
2431 | break; | |
2432 | } | |
2433 | } | |
2434 | ||
2435 | /* Execute entry. */ | |
2436 | record_exec_insn (regcache, gdbarch, record_list); | |
2437 | ||
2438 | if (record_list->next) | |
2439 | record_list = record_list->next; | |
2440 | else | |
2441 | break; | |
2442 | } | |
2443 | ||
2444 | /* Reverse execute to cur_record_list. */ | |
2445 | while (1) | |
2446 | { | |
2447 | /* Check for beginning and end of log. */ | |
2448 | if (record_list == cur_record_list) | |
2449 | break; | |
2450 | ||
2451 | record_exec_insn (regcache, gdbarch, record_list); | |
2452 | ||
2453 | if (record_list->prev) | |
2454 | record_list = record_list->prev; | |
2455 | } | |
2456 | ||
2457 | do_cleanups (set_cleanups); | |
2458 | bfd_close (obfd); | |
2459 | discard_cleanups (old_cleanups); | |
2460 | ||
2461 | /* Succeeded. */ | |
2462 | printf_filtered (_("Saved core file %s with execution log.\n"), | |
2463 | recfilename); | |
2464 | } | |
2465 | ||
6b04bdb7 MS |
2466 | /* record_goto_insn -- rewind the record log (forward or backward, |
2467 | depending on DIR) to the given entry, changing the program state | |
2468 | correspondingly. */ | |
2469 | ||
2470 | static void | |
2471 | record_goto_insn (struct record_entry *entry, | |
2472 | enum exec_direction_kind dir) | |
2473 | { | |
2474 | struct cleanup *set_cleanups = record_gdb_operation_disable_set (); | |
2475 | struct regcache *regcache = get_current_regcache (); | |
2476 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2477 | ||
2478 | /* Assume everything is valid: we will hit the entry, | |
2479 | and we will not hit the end of the recording. */ | |
2480 | ||
2481 | if (dir == EXEC_FORWARD) | |
2482 | record_list = record_list->next; | |
2483 | ||
2484 | do | |
2485 | { | |
2486 | record_exec_insn (regcache, gdbarch, record_list); | |
2487 | if (dir == EXEC_REVERSE) | |
2488 | record_list = record_list->prev; | |
2489 | else | |
2490 | record_list = record_list->next; | |
2491 | } while (record_list != entry); | |
2492 | do_cleanups (set_cleanups); | |
2493 | } | |
2494 | ||
2495 | /* "record goto" command. Argument is an instruction number, | |
2496 | as given by "info record". | |
2497 | ||
2498 | Rewinds the recording (forward or backward) to the given instruction. */ | |
2499 | ||
2500 | static void | |
2501 | cmd_record_goto (char *arg, int from_tty) | |
2502 | { | |
2503 | struct record_entry *p = NULL; | |
2504 | ULONGEST target_insn = 0; | |
2505 | ||
2506 | if (arg == NULL || *arg == '\0') | |
2507 | error (_("Command requires an argument (insn number to go to).")); | |
2508 | ||
2509 | if (strncmp (arg, "start", strlen ("start")) == 0 | |
2510 | || strncmp (arg, "begin", strlen ("begin")) == 0) | |
2511 | { | |
2512 | /* Special case. Find first insn. */ | |
2513 | for (p = &record_first; p != NULL; p = p->next) | |
2514 | if (p->type == record_end) | |
2515 | break; | |
2516 | if (p) | |
2517 | target_insn = p->u.end.insn_num; | |
2518 | } | |
2519 | else if (strncmp (arg, "end", strlen ("end")) == 0) | |
2520 | { | |
2521 | /* Special case. Find last insn. */ | |
2522 | for (p = record_list; p->next != NULL; p = p->next) | |
2523 | ; | |
2524 | for (; p!= NULL; p = p->prev) | |
2525 | if (p->type == record_end) | |
2526 | break; | |
2527 | if (p) | |
2528 | target_insn = p->u.end.insn_num; | |
2529 | } | |
2530 | else | |
2531 | { | |
2532 | /* General case. Find designated insn. */ | |
2533 | target_insn = parse_and_eval_long (arg); | |
2534 | ||
2535 | for (p = &record_first; p != NULL; p = p->next) | |
2536 | if (p->type == record_end && p->u.end.insn_num == target_insn) | |
2537 | break; | |
2538 | } | |
2539 | ||
2540 | if (p == NULL) | |
2541 | error (_("Target insn '%s' not found."), arg); | |
2542 | else if (p == record_list) | |
2543 | error (_("Already at insn '%s'."), arg); | |
2544 | else if (p->u.end.insn_num > record_list->u.end.insn_num) | |
2545 | { | |
2546 | printf_filtered (_("Go forward to insn number %s\n"), | |
2547 | pulongest (target_insn)); | |
2548 | record_goto_insn (p, EXEC_FORWARD); | |
2549 | } | |
2550 | else | |
2551 | { | |
2552 | printf_filtered (_("Go backward to insn number %s\n"), | |
2553 | pulongest (target_insn)); | |
2554 | record_goto_insn (p, EXEC_REVERSE); | |
2555 | } | |
2556 | registers_changed (); | |
2557 | reinit_frame_cache (); | |
2558 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
2559 | } | |
2560 | ||
69d05d38 HZ |
2561 | void |
2562 | _initialize_record (void) | |
2563 | { | |
0156b218 MS |
2564 | struct cmd_list_element *c; |
2565 | ||
69d05d38 HZ |
2566 | /* Init record_first. */ |
2567 | record_first.prev = NULL; | |
2568 | record_first.next = NULL; | |
2569 | record_first.type = record_end; | |
2570 | ||
2571 | init_record_ops (); | |
2572 | add_target (&record_ops); | |
27699eea MS |
2573 | init_record_core_ops (); |
2574 | add_target (&record_core_ops); | |
69d05d38 HZ |
2575 | |
2576 | add_setshow_zinteger_cmd ("record", no_class, &record_debug, | |
2577 | _("Set debugging of record/replay feature."), | |
2578 | _("Show debugging of record/replay feature."), | |
2579 | _("When enabled, debugging output for " | |
2580 | "record/replay feature is displayed."), | |
2581 | NULL, show_record_debug, &setdebuglist, | |
2582 | &showdebuglist); | |
2583 | ||
0156b218 MS |
2584 | c = add_prefix_cmd ("record", class_obscure, cmd_record_start, |
2585 | _("Abbreviated form of \"target record\" command."), | |
2586 | &record_cmdlist, "record ", 0, &cmdlist); | |
2587 | set_cmd_completer (c, filename_completer); | |
2588 | ||
69d05d38 HZ |
2589 | add_com_alias ("rec", "record", class_obscure, 1); |
2590 | add_prefix_cmd ("record", class_support, set_record_command, | |
2591 | _("Set record options"), &set_record_cmdlist, | |
2592 | "set record ", 0, &setlist); | |
2593 | add_alias_cmd ("rec", "record", class_obscure, 1, &setlist); | |
2594 | add_prefix_cmd ("record", class_support, show_record_command, | |
2595 | _("Show record options"), &show_record_cmdlist, | |
2596 | "show record ", 0, &showlist); | |
2597 | add_alias_cmd ("rec", "record", class_obscure, 1, &showlist); | |
2598 | add_prefix_cmd ("record", class_support, info_record_command, | |
2599 | _("Info record options"), &info_record_cmdlist, | |
2600 | "info record ", 0, &infolist); | |
2601 | add_alias_cmd ("rec", "record", class_obscure, 1, &infolist); | |
2602 | ||
0156b218 MS |
2603 | c = add_cmd ("save", class_obscure, cmd_record_save, |
2604 | _("Save the execution log to a file.\n\ | |
2605 | Argument is optional filename.\n\ | |
2606 | Default filename is 'gdb_record.<process_id>'."), | |
2607 | &record_cmdlist); | |
2608 | set_cmd_completer (c, filename_completer); | |
2609 | ||
2610 | c = add_cmd ("restore", class_obscure, cmd_record_restore, | |
2611 | _("Restore the execution log from a file.\n\ | |
2612 | Argument is filename. File must be created with 'record save'."), | |
2613 | &record_cmdlist); | |
2614 | set_cmd_completer (c, filename_completer); | |
69d05d38 HZ |
2615 | |
2616 | add_cmd ("delete", class_obscure, cmd_record_delete, | |
2617 | _("Delete the rest of execution log and start recording it anew."), | |
2618 | &record_cmdlist); | |
2619 | add_alias_cmd ("d", "delete", class_obscure, 1, &record_cmdlist); | |
2620 | add_alias_cmd ("del", "delete", class_obscure, 1, &record_cmdlist); | |
2621 | ||
2622 | add_cmd ("stop", class_obscure, cmd_record_stop, | |
2623 | _("Stop the record/replay target."), | |
2624 | &record_cmdlist); | |
2625 | add_alias_cmd ("s", "stop", class_obscure, 1, &record_cmdlist); | |
2626 | ||
2627 | /* Record instructions number limit command. */ | |
2628 | add_setshow_boolean_cmd ("stop-at-limit", no_class, | |
fda458ee | 2629 | &record_stop_at_limit, _("\ |
299a410e EZ |
2630 | Set whether record/replay stops when record/replay buffer becomes full."), _("\ |
2631 | Show whether record/replay stops when record/replay buffer becomes full."), _("\ | |
2632 | Default is ON.\n\ | |
2633 | When ON, if the record/replay buffer becomes full, ask user what to do.\n\ | |
2634 | When OFF, if the record/replay buffer becomes full,\n\ | |
2635 | delete the oldest recorded instruction to make room for each new one."), | |
fda458ee MS |
2636 | NULL, NULL, |
2637 | &set_record_cmdlist, &show_record_cmdlist); | |
191e1813 | 2638 | add_setshow_uinteger_cmd ("insn-number-max", no_class, |
69d05d38 HZ |
2639 | &record_insn_max_num, |
2640 | _("Set record/replay buffer limit."), | |
299a410e EZ |
2641 | _("Show record/replay buffer limit."), _("\ |
2642 | Set the maximum number of instructions to be stored in the\n\ | |
2643 | record/replay buffer. Zero means unlimited. Default is 200000."), | |
69d05d38 HZ |
2644 | set_record_insn_max_num, |
2645 | NULL, &set_record_cmdlist, &show_record_cmdlist); | |
6b04bdb7 MS |
2646 | |
2647 | add_cmd ("goto", class_obscure, cmd_record_goto, _("\ | |
2648 | Restore the program to its state at instruction number N.\n\ | |
2649 | Argument is instruction number, as shown by 'info record'."), | |
2650 | &record_cmdlist); | |
69d05d38 | 2651 | } |