| 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" |
| 26 | #include "completer.h" |
| 27 | #include "arch-utils.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "exec.h" |
| 30 | #include "record.h" |
| 31 | #include "elf-bfd.h" |
| 32 | #include "gcore.h" |
| 33 | |
| 34 | #include <signal.h> |
| 35 | |
| 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 | |
| 56 | #define DEFAULT_RECORD_INSN_MAX_NUM 200000 |
| 57 | |
| 58 | #define RECORD_IS_REPLAY \ |
| 59 | (record_list->next || execution_direction == EXEC_REVERSE) |
| 60 | |
| 61 | #define RECORD_FILE_MAGIC netorder32(0x20091016) |
| 62 | |
| 63 | /* These are the core structs of the process record functionality. |
| 64 | |
| 65 | A record_entry is a record of the value change of a register |
| 66 | ("record_reg") or a part of memory ("record_mem"). And each |
| 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. |
| 70 | |
| 71 | Each struct record_entry is linked to "record_list" by "prev" and |
| 72 | "next" pointers. */ |
| 73 | |
| 74 | struct record_mem_entry |
| 75 | { |
| 76 | CORE_ADDR addr; |
| 77 | int len; |
| 78 | /* Set this flag if target memory for this entry |
| 79 | can no longer be accessed. */ |
| 80 | int mem_entry_not_accessible; |
| 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; |
| 97 | }; |
| 98 | |
| 99 | struct record_end_entry |
| 100 | { |
| 101 | enum target_signal sigval; |
| 102 | ULONGEST insn_num; |
| 103 | }; |
| 104 | |
| 105 | enum record_type |
| 106 | { |
| 107 | record_end = 0, |
| 108 | record_reg, |
| 109 | record_mem |
| 110 | }; |
| 111 | |
| 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 | |
| 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; |
| 147 | /* end */ |
| 148 | struct record_end_entry end; |
| 149 | } u; |
| 150 | }; |
| 151 | |
| 152 | /* This is the debug switch for process record. */ |
| 153 | int record_debug = 0; |
| 154 | |
| 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 | |
| 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 | |
| 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; |
| 191 | /* Maximum allowed number of insns in execution log. */ |
| 192 | static unsigned int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM; |
| 193 | /* Actual count of insns presently in execution log. */ |
| 194 | static int record_insn_num = 0; |
| 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; |
| 198 | |
| 199 | /* The target_ops of process record. */ |
| 200 | static struct target_ops record_ops; |
| 201 | static struct target_ops record_core_ops; |
| 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, |
| 209 | struct target_waitstatus *, |
| 210 | int); |
| 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); |
| 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 *); |
| 227 | static int (*record_beneath_to_stopped_by_watchpoint) (void); |
| 228 | static int (*record_beneath_to_stopped_data_address) (struct target_ops *, |
| 229 | CORE_ADDR *); |
| 230 | |
| 231 | /* Alloc and free functions for record_reg, record_mem, and record_end |
| 232 | entries. */ |
| 233 | |
| 234 | /* Alloc a record_reg record entry. */ |
| 235 | |
| 236 | static inline struct record_entry * |
| 237 | record_reg_alloc (struct regcache *regcache, int regnum) |
| 238 | { |
| 239 | struct record_entry *rec; |
| 240 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 241 | |
| 242 | rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry)); |
| 243 | rec->type = record_reg; |
| 244 | rec->u.reg.num = regnum; |
| 245 | rec->u.reg.len = register_size (gdbarch, regnum); |
| 246 | if (rec->u.reg.len > sizeof (rec->u.reg.u.buf)) |
| 247 | rec->u.reg.u.ptr = (gdb_byte *) xmalloc (rec->u.reg.len); |
| 248 | |
| 249 | return rec; |
| 250 | } |
| 251 | |
| 252 | /* Free a record_reg record entry. */ |
| 253 | |
| 254 | static inline void |
| 255 | record_reg_release (struct record_entry *rec) |
| 256 | { |
| 257 | gdb_assert (rec->type == record_reg); |
| 258 | if (rec->u.reg.len > sizeof (rec->u.reg.u.buf)) |
| 259 | xfree (rec->u.reg.u.ptr); |
| 260 | xfree (rec); |
| 261 | } |
| 262 | |
| 263 | /* Alloc a record_mem record entry. */ |
| 264 | |
| 265 | static inline struct record_entry * |
| 266 | record_mem_alloc (CORE_ADDR addr, int len) |
| 267 | { |
| 268 | struct record_entry *rec; |
| 269 | |
| 270 | rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry)); |
| 271 | rec->type = record_mem; |
| 272 | rec->u.mem.addr = addr; |
| 273 | rec->u.mem.len = len; |
| 274 | if (rec->u.mem.len > sizeof (rec->u.mem.u.buf)) |
| 275 | rec->u.mem.u.ptr = (gdb_byte *) xmalloc (len); |
| 276 | |
| 277 | return rec; |
| 278 | } |
| 279 | |
| 280 | /* Free a record_mem record entry. */ |
| 281 | |
| 282 | static inline void |
| 283 | record_mem_release (struct record_entry *rec) |
| 284 | { |
| 285 | gdb_assert (rec->type == record_mem); |
| 286 | if (rec->u.mem.len > sizeof (rec->u.mem.u.buf)) |
| 287 | xfree (rec->u.mem.u.ptr); |
| 288 | xfree (rec); |
| 289 | } |
| 290 | |
| 291 | /* Alloc a record_end record entry. */ |
| 292 | |
| 293 | static inline struct record_entry * |
| 294 | record_end_alloc (void) |
| 295 | { |
| 296 | struct record_entry *rec; |
| 297 | |
| 298 | rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry)); |
| 299 | rec->type = record_end; |
| 300 | |
| 301 | return rec; |
| 302 | } |
| 303 | |
| 304 | /* Free a record_end record entry. */ |
| 305 | |
| 306 | static inline void |
| 307 | record_end_release (struct record_entry *rec) |
| 308 | { |
| 309 | xfree (rec); |
| 310 | } |
| 311 | |
| 312 | /* Free one record entry, any type. |
| 313 | Return entry->type, in case caller wants to know. */ |
| 314 | |
| 315 | static inline enum record_type |
| 316 | record_entry_release (struct record_entry *rec) |
| 317 | { |
| 318 | enum record_type type = rec->type; |
| 319 | |
| 320 | switch (type) { |
| 321 | case record_reg: |
| 322 | record_reg_release (rec); |
| 323 | break; |
| 324 | case record_mem: |
| 325 | record_mem_release (rec); |
| 326 | break; |
| 327 | case record_end: |
| 328 | record_end_release (rec); |
| 329 | break; |
| 330 | } |
| 331 | return type; |
| 332 | } |
| 333 | |
| 334 | /* Free all record entries in list pointed to by REC. */ |
| 335 | |
| 336 | static void |
| 337 | record_list_release (struct record_entry *rec) |
| 338 | { |
| 339 | if (!rec) |
| 340 | return; |
| 341 | |
| 342 | while (rec->next) |
| 343 | rec = rec->next; |
| 344 | |
| 345 | while (rec->prev) |
| 346 | { |
| 347 | rec = rec->prev; |
| 348 | record_entry_release (rec->next); |
| 349 | } |
| 350 | |
| 351 | if (rec == &record_first) |
| 352 | { |
| 353 | record_insn_num = 0; |
| 354 | record_first.next = NULL; |
| 355 | } |
| 356 | else |
| 357 | record_entry_release (rec); |
| 358 | } |
| 359 | |
| 360 | /* Free all record entries forward of the given list position. */ |
| 361 | |
| 362 | static void |
| 363 | record_list_release_following (struct record_entry *rec) |
| 364 | { |
| 365 | struct record_entry *tmp = rec->next; |
| 366 | |
| 367 | rec->next = NULL; |
| 368 | while (tmp) |
| 369 | { |
| 370 | rec = tmp->next; |
| 371 | if (record_entry_release (tmp) == record_end) |
| 372 | { |
| 373 | record_insn_num--; |
| 374 | record_insn_count--; |
| 375 | } |
| 376 | tmp = rec; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | /* Delete the first instruction from the beginning of the log, to make |
| 381 | room for adding a new instruction at the end of the log. |
| 382 | |
| 383 | Note -- this function does not modify record_insn_num. */ |
| 384 | |
| 385 | static void |
| 386 | record_list_release_first (void) |
| 387 | { |
| 388 | struct record_entry *tmp; |
| 389 | |
| 390 | if (!record_first.next) |
| 391 | return; |
| 392 | |
| 393 | /* Loop until a record_end. */ |
| 394 | while (1) |
| 395 | { |
| 396 | /* Cut record_first.next out of the linked list. */ |
| 397 | tmp = record_first.next; |
| 398 | record_first.next = tmp->next; |
| 399 | tmp->next->prev = &record_first; |
| 400 | |
| 401 | /* tmp is now isolated, and can be deleted. */ |
| 402 | if (record_entry_release (tmp) == record_end) |
| 403 | break; /* End loop at first record_end. */ |
| 404 | |
| 405 | if (!record_first.next) |
| 406 | { |
| 407 | gdb_assert (record_insn_num == 1); |
| 408 | break; /* End loop when list is empty. */ |
| 409 | } |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | /* Add a struct record_entry to record_arch_list. */ |
| 414 | |
| 415 | static void |
| 416 | record_arch_list_add (struct record_entry *rec) |
| 417 | { |
| 418 | if (record_debug > 1) |
| 419 | fprintf_unfiltered (gdb_stdlog, |
| 420 | "Process record: record_arch_list_add %s.\n", |
| 421 | host_address_to_string (rec)); |
| 422 | |
| 423 | if (record_arch_list_tail) |
| 424 | { |
| 425 | record_arch_list_tail->next = rec; |
| 426 | rec->prev = record_arch_list_tail; |
| 427 | record_arch_list_tail = rec; |
| 428 | } |
| 429 | else |
| 430 | { |
| 431 | record_arch_list_head = rec; |
| 432 | record_arch_list_tail = rec; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | /* Return the value storage location of a record entry. */ |
| 437 | static inline gdb_byte * |
| 438 | record_get_loc (struct record_entry *rec) |
| 439 | { |
| 440 | switch (rec->type) { |
| 441 | case record_mem: |
| 442 | if (rec->u.mem.len > sizeof (rec->u.mem.u.buf)) |
| 443 | return rec->u.mem.u.ptr; |
| 444 | else |
| 445 | return rec->u.mem.u.buf; |
| 446 | case record_reg: |
| 447 | if (rec->u.reg.len > sizeof (rec->u.reg.u.buf)) |
| 448 | return rec->u.reg.u.ptr; |
| 449 | else |
| 450 | return rec->u.reg.u.buf; |
| 451 | case record_end: |
| 452 | default: |
| 453 | gdb_assert (0); |
| 454 | return NULL; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* Record the value of a register NUM to record_arch_list. */ |
| 459 | |
| 460 | int |
| 461 | record_arch_list_add_reg (struct regcache *regcache, int regnum) |
| 462 | { |
| 463 | struct record_entry *rec; |
| 464 | |
| 465 | if (record_debug > 1) |
| 466 | fprintf_unfiltered (gdb_stdlog, |
| 467 | "Process record: add register num = %d to " |
| 468 | "record list.\n", |
| 469 | regnum); |
| 470 | |
| 471 | rec = record_reg_alloc (regcache, regnum); |
| 472 | |
| 473 | regcache_raw_read (regcache, regnum, record_get_loc (rec)); |
| 474 | |
| 475 | record_arch_list_add (rec); |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | /* Record the value of a region of memory whose address is ADDR and |
| 481 | length is LEN to record_arch_list. */ |
| 482 | |
| 483 | int |
| 484 | record_arch_list_add_mem (CORE_ADDR addr, int len) |
| 485 | { |
| 486 | struct record_entry *rec; |
| 487 | |
| 488 | if (record_debug > 1) |
| 489 | fprintf_unfiltered (gdb_stdlog, |
| 490 | "Process record: add mem addr = %s len = %d to " |
| 491 | "record list.\n", |
| 492 | paddress (target_gdbarch, addr), len); |
| 493 | |
| 494 | if (!addr) /* FIXME: Why? Some arch must permit it... */ |
| 495 | return 0; |
| 496 | |
| 497 | rec = record_mem_alloc (addr, len); |
| 498 | |
| 499 | if (target_read_memory (addr, record_get_loc (rec), len)) |
| 500 | { |
| 501 | if (record_debug) |
| 502 | fprintf_unfiltered (gdb_stdlog, |
| 503 | "Process record: error reading memory at " |
| 504 | "addr = %s len = %d.\n", |
| 505 | paddress (target_gdbarch, addr), len); |
| 506 | record_mem_release (rec); |
| 507 | return -1; |
| 508 | } |
| 509 | |
| 510 | record_arch_list_add (rec); |
| 511 | |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | /* Add a record_end type struct record_entry to record_arch_list. */ |
| 516 | |
| 517 | int |
| 518 | record_arch_list_add_end (void) |
| 519 | { |
| 520 | struct record_entry *rec; |
| 521 | |
| 522 | if (record_debug > 1) |
| 523 | fprintf_unfiltered (gdb_stdlog, |
| 524 | "Process record: add end to arch list.\n"); |
| 525 | |
| 526 | rec = record_end_alloc (); |
| 527 | rec->u.end.sigval = TARGET_SIGNAL_0; |
| 528 | rec->u.end.insn_num = ++record_insn_count; |
| 529 | |
| 530 | record_arch_list_add (rec); |
| 531 | |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | static void |
| 536 | record_check_insn_num (int set_terminal) |
| 537 | { |
| 538 | if (record_insn_max_num) |
| 539 | { |
| 540 | gdb_assert (record_insn_num <= record_insn_max_num); |
| 541 | if (record_insn_num == record_insn_max_num) |
| 542 | { |
| 543 | /* Ask user what to do. */ |
| 544 | if (record_stop_at_limit) |
| 545 | { |
| 546 | int q; |
| 547 | if (set_terminal) |
| 548 | target_terminal_ours (); |
| 549 | q = yquery (_("Do you want to auto delete previous execution " |
| 550 | "log entries when record/replay buffer becomes " |
| 551 | "full (record stop-at-limit)?")); |
| 552 | if (set_terminal) |
| 553 | target_terminal_inferior (); |
| 554 | if (q) |
| 555 | record_stop_at_limit = 0; |
| 556 | else |
| 557 | error (_("Process record: stopped by user.")); |
| 558 | } |
| 559 | } |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | static void |
| 564 | record_arch_list_cleanups (void *ignore) |
| 565 | { |
| 566 | record_list_release (record_arch_list_tail); |
| 567 | } |
| 568 | |
| 569 | /* Before inferior step (when GDB record the running message, inferior |
| 570 | only can step), GDB will call this function to record the values to |
| 571 | record_list. This function will call gdbarch_process_record to |
| 572 | record the running message of inferior and set them to |
| 573 | record_arch_list, and add it to record_list. */ |
| 574 | |
| 575 | struct record_message_args { |
| 576 | struct regcache *regcache; |
| 577 | enum target_signal signal; |
| 578 | }; |
| 579 | |
| 580 | static int |
| 581 | record_message (void *args) |
| 582 | { |
| 583 | int ret; |
| 584 | struct record_message_args *myargs = args; |
| 585 | struct gdbarch *gdbarch = get_regcache_arch (myargs->regcache); |
| 586 | struct cleanup *old_cleanups = make_cleanup (record_arch_list_cleanups, 0); |
| 587 | |
| 588 | record_arch_list_head = NULL; |
| 589 | record_arch_list_tail = NULL; |
| 590 | |
| 591 | /* Check record_insn_num. */ |
| 592 | record_check_insn_num (1); |
| 593 | |
| 594 | /* If gdb sends a signal value to target_resume, |
| 595 | save it in the 'end' field of the previous instruction. |
| 596 | |
| 597 | Maybe process record should record what really happened, |
| 598 | rather than what gdb pretends has happened. |
| 599 | |
| 600 | So if Linux delivered the signal to the child process during |
| 601 | the record mode, we will record it and deliver it again in |
| 602 | the replay mode. |
| 603 | |
| 604 | If user says "ignore this signal" during the record mode, then |
| 605 | it will be ignored again during the replay mode (no matter if |
| 606 | the user says something different, like "deliver this signal" |
| 607 | during the replay mode). |
| 608 | |
| 609 | User should understand that nothing he does during the replay |
| 610 | mode will change the behavior of the child. If he tries, |
| 611 | then that is a user error. |
| 612 | |
| 613 | But we should still deliver the signal to gdb during the replay, |
| 614 | if we delivered it during the recording. Therefore we should |
| 615 | record the signal during record_wait, not record_resume. */ |
| 616 | if (record_list != &record_first) /* FIXME better way to check */ |
| 617 | { |
| 618 | gdb_assert (record_list->type == record_end); |
| 619 | record_list->u.end.sigval = myargs->signal; |
| 620 | } |
| 621 | |
| 622 | if (myargs->signal == TARGET_SIGNAL_0 |
| 623 | || !gdbarch_process_record_signal_p (gdbarch)) |
| 624 | ret = gdbarch_process_record (gdbarch, |
| 625 | myargs->regcache, |
| 626 | regcache_read_pc (myargs->regcache)); |
| 627 | else |
| 628 | ret = gdbarch_process_record_signal (gdbarch, |
| 629 | myargs->regcache, |
| 630 | myargs->signal); |
| 631 | |
| 632 | if (ret > 0) |
| 633 | error (_("Process record: inferior program stopped.")); |
| 634 | if (ret < 0) |
| 635 | error (_("Process record: failed to record execution log.")); |
| 636 | |
| 637 | discard_cleanups (old_cleanups); |
| 638 | |
| 639 | record_list->next = record_arch_list_head; |
| 640 | record_arch_list_head->prev = record_list; |
| 641 | record_list = record_arch_list_tail; |
| 642 | |
| 643 | if (record_insn_num == record_insn_max_num && record_insn_max_num) |
| 644 | record_list_release_first (); |
| 645 | else |
| 646 | record_insn_num++; |
| 647 | |
| 648 | return 1; |
| 649 | } |
| 650 | |
| 651 | static int |
| 652 | do_record_message (struct regcache *regcache, |
| 653 | enum target_signal signal) |
| 654 | { |
| 655 | struct record_message_args args; |
| 656 | |
| 657 | args.regcache = regcache; |
| 658 | args.signal = signal; |
| 659 | return catch_errors (record_message, &args, NULL, RETURN_MASK_ALL); |
| 660 | } |
| 661 | |
| 662 | /* Set to 1 if record_store_registers and record_xfer_partial |
| 663 | doesn't need record. */ |
| 664 | |
| 665 | static int record_gdb_operation_disable = 0; |
| 666 | |
| 667 | struct cleanup * |
| 668 | record_gdb_operation_disable_set (void) |
| 669 | { |
| 670 | struct cleanup *old_cleanups = NULL; |
| 671 | |
| 672 | old_cleanups = |
| 673 | make_cleanup_restore_integer (&record_gdb_operation_disable); |
| 674 | record_gdb_operation_disable = 1; |
| 675 | |
| 676 | return old_cleanups; |
| 677 | } |
| 678 | |
| 679 | /* Flag set to TRUE for target_stopped_by_watchpoint. */ |
| 680 | static int record_hw_watchpoint = 0; |
| 681 | |
| 682 | /* Execute one instruction from the record log. Each instruction in |
| 683 | the log will be represented by an arbitrary sequence of register |
| 684 | entries and memory entries, followed by an 'end' entry. */ |
| 685 | |
| 686 | static inline void |
| 687 | record_exec_insn (struct regcache *regcache, struct gdbarch *gdbarch, |
| 688 | struct record_entry *entry) |
| 689 | { |
| 690 | switch (entry->type) |
| 691 | { |
| 692 | case record_reg: /* reg */ |
| 693 | { |
| 694 | gdb_byte reg[MAX_REGISTER_SIZE]; |
| 695 | |
| 696 | if (record_debug > 1) |
| 697 | fprintf_unfiltered (gdb_stdlog, |
| 698 | "Process record: record_reg %s to " |
| 699 | "inferior num = %d.\n", |
| 700 | host_address_to_string (entry), |
| 701 | entry->u.reg.num); |
| 702 | |
| 703 | regcache_cooked_read (regcache, entry->u.reg.num, reg); |
| 704 | regcache_cooked_write (regcache, entry->u.reg.num, |
| 705 | record_get_loc (entry)); |
| 706 | memcpy (record_get_loc (entry), reg, entry->u.reg.len); |
| 707 | } |
| 708 | break; |
| 709 | |
| 710 | case record_mem: /* mem */ |
| 711 | { |
| 712 | /* Nothing to do if the entry is flagged not_accessible. */ |
| 713 | if (!entry->u.mem.mem_entry_not_accessible) |
| 714 | { |
| 715 | gdb_byte *mem = alloca (entry->u.mem.len); |
| 716 | |
| 717 | if (record_debug > 1) |
| 718 | fprintf_unfiltered (gdb_stdlog, |
| 719 | "Process record: record_mem %s to " |
| 720 | "inferior addr = %s len = %d.\n", |
| 721 | host_address_to_string (entry), |
| 722 | paddress (gdbarch, entry->u.mem.addr), |
| 723 | entry->u.mem.len); |
| 724 | |
| 725 | if (target_read_memory (entry->u.mem.addr, mem, entry->u.mem.len)) |
| 726 | { |
| 727 | entry->u.mem.mem_entry_not_accessible = 1; |
| 728 | if (record_debug) |
| 729 | warning ("Process record: error reading memory at " |
| 730 | "addr = %s len = %d.", |
| 731 | paddress (gdbarch, entry->u.mem.addr), |
| 732 | entry->u.mem.len); |
| 733 | } |
| 734 | else |
| 735 | { |
| 736 | if (target_write_memory (entry->u.mem.addr, |
| 737 | record_get_loc (entry), |
| 738 | entry->u.mem.len)) |
| 739 | { |
| 740 | entry->u.mem.mem_entry_not_accessible = 1; |
| 741 | if (record_debug) |
| 742 | warning ("Process record: error writing memory at " |
| 743 | "addr = %s len = %d.", |
| 744 | paddress (gdbarch, entry->u.mem.addr), |
| 745 | entry->u.mem.len); |
| 746 | } |
| 747 | else |
| 748 | { |
| 749 | memcpy (record_get_loc (entry), mem, entry->u.mem.len); |
| 750 | |
| 751 | /* We've changed memory --- check if a hardware |
| 752 | watchpoint should trap. Note that this |
| 753 | presently assumes the target beneath supports |
| 754 | continuable watchpoints. On non-continuable |
| 755 | watchpoints target, we'll want to check this |
| 756 | _before_ actually doing the memory change, and |
| 757 | not doing the change at all if the watchpoint |
| 758 | traps. */ |
| 759 | if (hardware_watchpoint_inserted_in_range |
| 760 | (get_regcache_aspace (regcache), |
| 761 | entry->u.mem.addr, entry->u.mem.len)) |
| 762 | record_hw_watchpoint = 1; |
| 763 | } |
| 764 | } |
| 765 | } |
| 766 | } |
| 767 | break; |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | static struct target_ops *tmp_to_resume_ops; |
| 772 | static void (*tmp_to_resume) (struct target_ops *, ptid_t, int, |
| 773 | enum target_signal); |
| 774 | static struct target_ops *tmp_to_wait_ops; |
| 775 | static ptid_t (*tmp_to_wait) (struct target_ops *, ptid_t, |
| 776 | struct target_waitstatus *, |
| 777 | int); |
| 778 | static struct target_ops *tmp_to_store_registers_ops; |
| 779 | static void (*tmp_to_store_registers) (struct target_ops *, |
| 780 | struct regcache *, |
| 781 | int regno); |
| 782 | static struct target_ops *tmp_to_xfer_partial_ops; |
| 783 | static LONGEST (*tmp_to_xfer_partial) (struct target_ops *ops, |
| 784 | enum target_object object, |
| 785 | const char *annex, |
| 786 | gdb_byte *readbuf, |
| 787 | const gdb_byte *writebuf, |
| 788 | ULONGEST offset, |
| 789 | LONGEST len); |
| 790 | static int (*tmp_to_insert_breakpoint) (struct gdbarch *, |
| 791 | struct bp_target_info *); |
| 792 | static int (*tmp_to_remove_breakpoint) (struct gdbarch *, |
| 793 | struct bp_target_info *); |
| 794 | static int (*tmp_to_stopped_by_watchpoint) (void); |
| 795 | static int (*tmp_to_stopped_data_address) (struct target_ops *, CORE_ADDR *); |
| 796 | |
| 797 | static void record_restore (void); |
| 798 | |
| 799 | /* Open the process record target. */ |
| 800 | |
| 801 | static void |
| 802 | record_core_open_1 (char *name, int from_tty) |
| 803 | { |
| 804 | struct regcache *regcache = get_current_regcache (); |
| 805 | int regnum = gdbarch_num_regs (get_regcache_arch (regcache)); |
| 806 | int i; |
| 807 | |
| 808 | /* Get record_core_regbuf. */ |
| 809 | target_fetch_registers (regcache, -1); |
| 810 | record_core_regbuf = xmalloc (MAX_REGISTER_SIZE * regnum); |
| 811 | for (i = 0; i < regnum; i ++) |
| 812 | regcache_raw_collect (regcache, i, |
| 813 | record_core_regbuf + MAX_REGISTER_SIZE * i); |
| 814 | |
| 815 | /* Get record_core_start and record_core_end. */ |
| 816 | if (build_section_table (core_bfd, &record_core_start, &record_core_end)) |
| 817 | { |
| 818 | xfree (record_core_regbuf); |
| 819 | record_core_regbuf = NULL; |
| 820 | error (_("\"%s\": Can't find sections: %s"), |
| 821 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| 822 | } |
| 823 | |
| 824 | push_target (&record_core_ops); |
| 825 | record_restore (); |
| 826 | } |
| 827 | |
| 828 | /* "to_open" target method for 'live' processes. */ |
| 829 | |
| 830 | static void |
| 831 | record_open_1 (char *name, int from_tty) |
| 832 | { |
| 833 | struct target_ops *t; |
| 834 | |
| 835 | if (record_debug) |
| 836 | fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n"); |
| 837 | |
| 838 | /* check exec */ |
| 839 | if (!target_has_execution) |
| 840 | error (_("Process record: the program is not being run.")); |
| 841 | if (non_stop) |
| 842 | error (_("Process record target can't debug inferior in non-stop mode " |
| 843 | "(non-stop).")); |
| 844 | if (target_async_permitted) |
| 845 | error (_("Process record target can't debug inferior in asynchronous " |
| 846 | "mode (target-async).")); |
| 847 | |
| 848 | if (!gdbarch_process_record_p (target_gdbarch)) |
| 849 | error (_("Process record: the current architecture doesn't support " |
| 850 | "record function.")); |
| 851 | |
| 852 | if (!tmp_to_resume) |
| 853 | error (_("Could not find 'to_resume' method on the target stack.")); |
| 854 | if (!tmp_to_wait) |
| 855 | error (_("Could not find 'to_wait' method on the target stack.")); |
| 856 | if (!tmp_to_store_registers) |
| 857 | error (_("Could not find 'to_store_registers' method on the target stack.")); |
| 858 | if (!tmp_to_insert_breakpoint) |
| 859 | error (_("Could not find 'to_insert_breakpoint' method on the target stack.")); |
| 860 | if (!tmp_to_remove_breakpoint) |
| 861 | error (_("Could not find 'to_remove_breakpoint' method on the target stack.")); |
| 862 | |
| 863 | push_target (&record_ops); |
| 864 | } |
| 865 | |
| 866 | /* "to_open" target method. Open the process record target. */ |
| 867 | |
| 868 | static void |
| 869 | record_open (char *name, int from_tty) |
| 870 | { |
| 871 | struct target_ops *t; |
| 872 | |
| 873 | if (record_debug) |
| 874 | fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n"); |
| 875 | |
| 876 | /* Check if record target is already running. */ |
| 877 | if (current_target.to_stratum == record_stratum) |
| 878 | error (_("Process record target already running. Use \"record stop\" to " |
| 879 | "stop record target first.")); |
| 880 | |
| 881 | /* Reset the tmp beneath pointers. */ |
| 882 | tmp_to_resume_ops = NULL; |
| 883 | tmp_to_resume = NULL; |
| 884 | tmp_to_wait_ops = NULL; |
| 885 | tmp_to_wait = NULL; |
| 886 | tmp_to_store_registers_ops = NULL; |
| 887 | tmp_to_store_registers = NULL; |
| 888 | tmp_to_xfer_partial_ops = NULL; |
| 889 | tmp_to_xfer_partial = NULL; |
| 890 | tmp_to_insert_breakpoint = NULL; |
| 891 | tmp_to_remove_breakpoint = NULL; |
| 892 | |
| 893 | /* Set the beneath function pointers. */ |
| 894 | for (t = current_target.beneath; t != NULL; t = t->beneath) |
| 895 | { |
| 896 | if (!tmp_to_resume) |
| 897 | { |
| 898 | tmp_to_resume = t->to_resume; |
| 899 | tmp_to_resume_ops = t; |
| 900 | } |
| 901 | if (!tmp_to_wait) |
| 902 | { |
| 903 | tmp_to_wait = t->to_wait; |
| 904 | tmp_to_wait_ops = t; |
| 905 | } |
| 906 | if (!tmp_to_store_registers) |
| 907 | { |
| 908 | tmp_to_store_registers = t->to_store_registers; |
| 909 | tmp_to_store_registers_ops = t; |
| 910 | } |
| 911 | if (!tmp_to_xfer_partial) |
| 912 | { |
| 913 | tmp_to_xfer_partial = t->to_xfer_partial; |
| 914 | tmp_to_xfer_partial_ops = t; |
| 915 | } |
| 916 | if (!tmp_to_insert_breakpoint) |
| 917 | tmp_to_insert_breakpoint = t->to_insert_breakpoint; |
| 918 | if (!tmp_to_remove_breakpoint) |
| 919 | tmp_to_remove_breakpoint = t->to_remove_breakpoint; |
| 920 | if (!tmp_to_stopped_by_watchpoint) |
| 921 | tmp_to_stopped_by_watchpoint = t->to_stopped_by_watchpoint; |
| 922 | if (!tmp_to_stopped_data_address) |
| 923 | tmp_to_stopped_data_address = t->to_stopped_data_address; |
| 924 | } |
| 925 | if (!tmp_to_xfer_partial) |
| 926 | error (_("Could not find 'to_xfer_partial' method on the target stack.")); |
| 927 | |
| 928 | /* Reset */ |
| 929 | record_insn_num = 0; |
| 930 | record_insn_count = 0; |
| 931 | record_list = &record_first; |
| 932 | record_list->next = NULL; |
| 933 | |
| 934 | /* Set the tmp beneath pointers to beneath pointers. */ |
| 935 | record_beneath_to_resume_ops = tmp_to_resume_ops; |
| 936 | record_beneath_to_resume = tmp_to_resume; |
| 937 | record_beneath_to_wait_ops = tmp_to_wait_ops; |
| 938 | record_beneath_to_wait = tmp_to_wait; |
| 939 | record_beneath_to_store_registers_ops = tmp_to_store_registers_ops; |
| 940 | record_beneath_to_store_registers = tmp_to_store_registers; |
| 941 | record_beneath_to_xfer_partial_ops = tmp_to_xfer_partial_ops; |
| 942 | record_beneath_to_xfer_partial = tmp_to_xfer_partial; |
| 943 | record_beneath_to_insert_breakpoint = tmp_to_insert_breakpoint; |
| 944 | record_beneath_to_remove_breakpoint = tmp_to_remove_breakpoint; |
| 945 | record_beneath_to_stopped_by_watchpoint = tmp_to_stopped_by_watchpoint; |
| 946 | record_beneath_to_stopped_data_address = tmp_to_stopped_data_address; |
| 947 | |
| 948 | if (current_target.to_stratum == core_stratum) |
| 949 | record_core_open_1 (name, from_tty); |
| 950 | else |
| 951 | record_open_1 (name, from_tty); |
| 952 | } |
| 953 | |
| 954 | /* "to_close" target method. Close the process record target. */ |
| 955 | |
| 956 | static void |
| 957 | record_close (int quitting) |
| 958 | { |
| 959 | struct record_core_buf_entry *entry; |
| 960 | |
| 961 | if (record_debug) |
| 962 | fprintf_unfiltered (gdb_stdlog, "Process record: record_close\n"); |
| 963 | |
| 964 | record_list_release (record_list); |
| 965 | |
| 966 | /* Release record_core_regbuf. */ |
| 967 | if (record_core_regbuf) |
| 968 | { |
| 969 | xfree (record_core_regbuf); |
| 970 | record_core_regbuf = NULL; |
| 971 | } |
| 972 | |
| 973 | /* Release record_core_buf_list. */ |
| 974 | if (record_core_buf_list) |
| 975 | { |
| 976 | for (entry = record_core_buf_list->prev; entry; entry = entry->prev) |
| 977 | { |
| 978 | xfree (record_core_buf_list); |
| 979 | record_core_buf_list = entry; |
| 980 | } |
| 981 | record_core_buf_list = NULL; |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | static int record_resume_step = 0; |
| 986 | static int record_resume_error; |
| 987 | |
| 988 | /* "to_resume" target method. Resume the process record target. */ |
| 989 | |
| 990 | static void |
| 991 | record_resume (struct target_ops *ops, ptid_t ptid, int step, |
| 992 | enum target_signal signal) |
| 993 | { |
| 994 | record_resume_step = step; |
| 995 | |
| 996 | if (!RECORD_IS_REPLAY) |
| 997 | { |
| 998 | if (do_record_message (get_current_regcache (), signal)) |
| 999 | { |
| 1000 | record_resume_error = 0; |
| 1001 | } |
| 1002 | else |
| 1003 | { |
| 1004 | record_resume_error = 1; |
| 1005 | return; |
| 1006 | } |
| 1007 | record_beneath_to_resume (record_beneath_to_resume_ops, ptid, 1, |
| 1008 | signal); |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | static int record_get_sig = 0; |
| 1013 | |
| 1014 | /* SIGINT signal handler, registered by "to_wait" method. */ |
| 1015 | |
| 1016 | static void |
| 1017 | record_sig_handler (int signo) |
| 1018 | { |
| 1019 | if (record_debug) |
| 1020 | fprintf_unfiltered (gdb_stdlog, "Process record: get a signal\n"); |
| 1021 | |
| 1022 | /* It will break the running inferior in replay mode. */ |
| 1023 | record_resume_step = 1; |
| 1024 | |
| 1025 | /* It will let record_wait set inferior status to get the signal |
| 1026 | SIGINT. */ |
| 1027 | record_get_sig = 1; |
| 1028 | } |
| 1029 | |
| 1030 | static void |
| 1031 | record_wait_cleanups (void *ignore) |
| 1032 | { |
| 1033 | if (execution_direction == EXEC_REVERSE) |
| 1034 | { |
| 1035 | if (record_list->next) |
| 1036 | record_list = record_list->next; |
| 1037 | } |
| 1038 | else |
| 1039 | record_list = record_list->prev; |
| 1040 | } |
| 1041 | |
| 1042 | /* "to_wait" target method for process record target. |
| 1043 | |
| 1044 | In record mode, the target is always run in singlestep mode |
| 1045 | (even when gdb says to continue). The to_wait method intercepts |
| 1046 | the stop events and determines which ones are to be passed on to |
| 1047 | gdb. Most stop events are just singlestep events that gdb is not |
| 1048 | to know about, so the to_wait method just records them and keeps |
| 1049 | singlestepping. |
| 1050 | |
| 1051 | In replay mode, this function emulates the recorded execution log, |
| 1052 | one instruction at a time (forward or backward), and determines |
| 1053 | where to stop. */ |
| 1054 | |
| 1055 | static ptid_t |
| 1056 | record_wait (struct target_ops *ops, |
| 1057 | ptid_t ptid, struct target_waitstatus *status, |
| 1058 | int options) |
| 1059 | { |
| 1060 | struct cleanup *set_cleanups = record_gdb_operation_disable_set (); |
| 1061 | |
| 1062 | if (record_debug) |
| 1063 | fprintf_unfiltered (gdb_stdlog, |
| 1064 | "Process record: record_wait " |
| 1065 | "record_resume_step = %d\n", |
| 1066 | record_resume_step); |
| 1067 | |
| 1068 | if (!RECORD_IS_REPLAY && ops != &record_core_ops) |
| 1069 | { |
| 1070 | if (record_resume_error) |
| 1071 | { |
| 1072 | /* If record_resume get error, return directly. */ |
| 1073 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1074 | status->value.sig = TARGET_SIGNAL_ABRT; |
| 1075 | return inferior_ptid; |
| 1076 | } |
| 1077 | |
| 1078 | if (record_resume_step) |
| 1079 | { |
| 1080 | /* This is a single step. */ |
| 1081 | return record_beneath_to_wait (record_beneath_to_wait_ops, |
| 1082 | ptid, status, options); |
| 1083 | } |
| 1084 | else |
| 1085 | { |
| 1086 | /* This is not a single step. */ |
| 1087 | ptid_t ret; |
| 1088 | CORE_ADDR tmp_pc; |
| 1089 | |
| 1090 | while (1) |
| 1091 | { |
| 1092 | ret = record_beneath_to_wait (record_beneath_to_wait_ops, |
| 1093 | ptid, status, options); |
| 1094 | |
| 1095 | /* Is this a SIGTRAP? */ |
| 1096 | if (status->kind == TARGET_WAITKIND_STOPPED |
| 1097 | && status->value.sig == TARGET_SIGNAL_TRAP) |
| 1098 | { |
| 1099 | struct regcache *regcache; |
| 1100 | struct address_space *aspace; |
| 1101 | |
| 1102 | /* Yes -- this is likely our single-step finishing, |
| 1103 | but check if there's any reason the core would be |
| 1104 | interested in the event. */ |
| 1105 | |
| 1106 | registers_changed (); |
| 1107 | regcache = get_current_regcache (); |
| 1108 | tmp_pc = regcache_read_pc (regcache); |
| 1109 | aspace = get_regcache_aspace (regcache); |
| 1110 | |
| 1111 | if (target_stopped_by_watchpoint ()) |
| 1112 | { |
| 1113 | /* Always interested in watchpoints. */ |
| 1114 | } |
| 1115 | else if (breakpoint_inserted_here_p (aspace, tmp_pc)) |
| 1116 | { |
| 1117 | /* There is a breakpoint here. Let the core |
| 1118 | handle it. */ |
| 1119 | if (software_breakpoint_inserted_here_p (aspace, tmp_pc)) |
| 1120 | { |
| 1121 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 1122 | CORE_ADDR decr_pc_after_break |
| 1123 | = gdbarch_decr_pc_after_break (gdbarch); |
| 1124 | if (decr_pc_after_break) |
| 1125 | regcache_write_pc (regcache, |
| 1126 | tmp_pc + decr_pc_after_break); |
| 1127 | } |
| 1128 | } |
| 1129 | else |
| 1130 | { |
| 1131 | /* This must be a single-step trap. Record the |
| 1132 | insn and issue another step. */ |
| 1133 | if (!do_record_message (regcache, TARGET_SIGNAL_0)) |
| 1134 | break; |
| 1135 | |
| 1136 | record_beneath_to_resume (record_beneath_to_resume_ops, |
| 1137 | ptid, 1, |
| 1138 | TARGET_SIGNAL_0); |
| 1139 | continue; |
| 1140 | } |
| 1141 | } |
| 1142 | |
| 1143 | /* The inferior is broken by a breakpoint or a signal. */ |
| 1144 | break; |
| 1145 | } |
| 1146 | |
| 1147 | return ret; |
| 1148 | } |
| 1149 | } |
| 1150 | else |
| 1151 | { |
| 1152 | struct regcache *regcache = get_current_regcache (); |
| 1153 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 1154 | struct address_space *aspace = get_regcache_aspace (regcache); |
| 1155 | int continue_flag = 1; |
| 1156 | int first_record_end = 1; |
| 1157 | struct cleanup *old_cleanups = make_cleanup (record_wait_cleanups, 0); |
| 1158 | CORE_ADDR tmp_pc; |
| 1159 | |
| 1160 | record_hw_watchpoint = 0; |
| 1161 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1162 | |
| 1163 | /* Check breakpoint when forward execute. */ |
| 1164 | if (execution_direction == EXEC_FORWARD) |
| 1165 | { |
| 1166 | tmp_pc = regcache_read_pc (regcache); |
| 1167 | if (breakpoint_inserted_here_p (aspace, tmp_pc)) |
| 1168 | { |
| 1169 | int decr_pc_after_break = gdbarch_decr_pc_after_break (gdbarch); |
| 1170 | |
| 1171 | if (record_debug) |
| 1172 | fprintf_unfiltered (gdb_stdlog, |
| 1173 | "Process record: break at %s.\n", |
| 1174 | paddress (gdbarch, tmp_pc)); |
| 1175 | |
| 1176 | if (decr_pc_after_break |
| 1177 | && !record_resume_step |
| 1178 | && software_breakpoint_inserted_here_p (aspace, tmp_pc)) |
| 1179 | regcache_write_pc (regcache, |
| 1180 | tmp_pc + decr_pc_after_break); |
| 1181 | goto replay_out; |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | record_get_sig = 0; |
| 1186 | signal (SIGINT, record_sig_handler); |
| 1187 | /* If GDB is in terminal_inferior mode, it will not get the signal. |
| 1188 | And in GDB replay mode, GDB doesn't need to be in terminal_inferior |
| 1189 | mode, because inferior will not executed. |
| 1190 | Then set it to terminal_ours to make GDB get the signal. */ |
| 1191 | target_terminal_ours (); |
| 1192 | |
| 1193 | /* In EXEC_FORWARD mode, record_list points to the tail of prev |
| 1194 | instruction. */ |
| 1195 | if (execution_direction == EXEC_FORWARD && record_list->next) |
| 1196 | record_list = record_list->next; |
| 1197 | |
| 1198 | /* Loop over the record_list, looking for the next place to |
| 1199 | stop. */ |
| 1200 | do |
| 1201 | { |
| 1202 | /* Check for beginning and end of log. */ |
| 1203 | if (execution_direction == EXEC_REVERSE |
| 1204 | && record_list == &record_first) |
| 1205 | { |
| 1206 | /* Hit beginning of record log in reverse. */ |
| 1207 | status->kind = TARGET_WAITKIND_NO_HISTORY; |
| 1208 | break; |
| 1209 | } |
| 1210 | if (execution_direction != EXEC_REVERSE && !record_list->next) |
| 1211 | { |
| 1212 | /* Hit end of record log going forward. */ |
| 1213 | status->kind = TARGET_WAITKIND_NO_HISTORY; |
| 1214 | break; |
| 1215 | } |
| 1216 | |
| 1217 | record_exec_insn (regcache, gdbarch, record_list); |
| 1218 | |
| 1219 | if (record_list->type == record_end) |
| 1220 | { |
| 1221 | if (record_debug > 1) |
| 1222 | fprintf_unfiltered (gdb_stdlog, |
| 1223 | "Process record: record_end %s to " |
| 1224 | "inferior.\n", |
| 1225 | host_address_to_string (record_list)); |
| 1226 | |
| 1227 | if (first_record_end && execution_direction == EXEC_REVERSE) |
| 1228 | { |
| 1229 | /* When reverse excute, the first record_end is the part of |
| 1230 | current instruction. */ |
| 1231 | first_record_end = 0; |
| 1232 | } |
| 1233 | else |
| 1234 | { |
| 1235 | /* In EXEC_REVERSE mode, this is the record_end of prev |
| 1236 | instruction. |
| 1237 | In EXEC_FORWARD mode, this is the record_end of current |
| 1238 | instruction. */ |
| 1239 | /* step */ |
| 1240 | if (record_resume_step) |
| 1241 | { |
| 1242 | if (record_debug > 1) |
| 1243 | fprintf_unfiltered (gdb_stdlog, |
| 1244 | "Process record: step.\n"); |
| 1245 | continue_flag = 0; |
| 1246 | } |
| 1247 | |
| 1248 | /* check breakpoint */ |
| 1249 | tmp_pc = regcache_read_pc (regcache); |
| 1250 | if (breakpoint_inserted_here_p (aspace, tmp_pc)) |
| 1251 | { |
| 1252 | int decr_pc_after_break |
| 1253 | = gdbarch_decr_pc_after_break (gdbarch); |
| 1254 | |
| 1255 | if (record_debug) |
| 1256 | fprintf_unfiltered (gdb_stdlog, |
| 1257 | "Process record: break " |
| 1258 | "at %s.\n", |
| 1259 | paddress (gdbarch, tmp_pc)); |
| 1260 | if (decr_pc_after_break |
| 1261 | && execution_direction == EXEC_FORWARD |
| 1262 | && !record_resume_step |
| 1263 | && software_breakpoint_inserted_here_p (aspace, |
| 1264 | tmp_pc)) |
| 1265 | regcache_write_pc (regcache, |
| 1266 | tmp_pc + decr_pc_after_break); |
| 1267 | continue_flag = 0; |
| 1268 | } |
| 1269 | |
| 1270 | if (record_hw_watchpoint) |
| 1271 | { |
| 1272 | if (record_debug) |
| 1273 | fprintf_unfiltered (gdb_stdlog, "\ |
| 1274 | Process record: hit hw watchpoint.\n"); |
| 1275 | continue_flag = 0; |
| 1276 | } |
| 1277 | /* Check target signal */ |
| 1278 | if (record_list->u.end.sigval != TARGET_SIGNAL_0) |
| 1279 | /* FIXME: better way to check */ |
| 1280 | continue_flag = 0; |
| 1281 | } |
| 1282 | } |
| 1283 | |
| 1284 | if (continue_flag) |
| 1285 | { |
| 1286 | if (execution_direction == EXEC_REVERSE) |
| 1287 | { |
| 1288 | if (record_list->prev) |
| 1289 | record_list = record_list->prev; |
| 1290 | } |
| 1291 | else |
| 1292 | { |
| 1293 | if (record_list->next) |
| 1294 | record_list = record_list->next; |
| 1295 | } |
| 1296 | } |
| 1297 | } |
| 1298 | while (continue_flag); |
| 1299 | |
| 1300 | signal (SIGINT, handle_sigint); |
| 1301 | |
| 1302 | replay_out: |
| 1303 | if (record_get_sig) |
| 1304 | status->value.sig = TARGET_SIGNAL_INT; |
| 1305 | else if (record_list->u.end.sigval != TARGET_SIGNAL_0) |
| 1306 | /* FIXME: better way to check */ |
| 1307 | status->value.sig = record_list->u.end.sigval; |
| 1308 | else |
| 1309 | status->value.sig = TARGET_SIGNAL_TRAP; |
| 1310 | |
| 1311 | discard_cleanups (old_cleanups); |
| 1312 | } |
| 1313 | |
| 1314 | do_cleanups (set_cleanups); |
| 1315 | return inferior_ptid; |
| 1316 | } |
| 1317 | |
| 1318 | static int |
| 1319 | record_stopped_by_watchpoint (void) |
| 1320 | { |
| 1321 | if (RECORD_IS_REPLAY) |
| 1322 | return record_hw_watchpoint; |
| 1323 | else |
| 1324 | return record_beneath_to_stopped_by_watchpoint (); |
| 1325 | } |
| 1326 | |
| 1327 | static int |
| 1328 | record_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) |
| 1329 | { |
| 1330 | if (RECORD_IS_REPLAY) |
| 1331 | return 0; |
| 1332 | else |
| 1333 | return record_beneath_to_stopped_data_address (ops, addr_p); |
| 1334 | } |
| 1335 | |
| 1336 | /* "to_disconnect" method for process record target. */ |
| 1337 | |
| 1338 | static void |
| 1339 | record_disconnect (struct target_ops *target, char *args, int from_tty) |
| 1340 | { |
| 1341 | if (record_debug) |
| 1342 | fprintf_unfiltered (gdb_stdlog, "Process record: record_disconnect\n"); |
| 1343 | |
| 1344 | unpush_target (&record_ops); |
| 1345 | target_disconnect (args, from_tty); |
| 1346 | } |
| 1347 | |
| 1348 | /* "to_detach" method for process record target. */ |
| 1349 | |
| 1350 | static void |
| 1351 | record_detach (struct target_ops *ops, char *args, int from_tty) |
| 1352 | { |
| 1353 | if (record_debug) |
| 1354 | fprintf_unfiltered (gdb_stdlog, "Process record: record_detach\n"); |
| 1355 | |
| 1356 | unpush_target (&record_ops); |
| 1357 | target_detach (args, from_tty); |
| 1358 | } |
| 1359 | |
| 1360 | /* "to_mourn_inferior" method for process record target. */ |
| 1361 | |
| 1362 | static void |
| 1363 | record_mourn_inferior (struct target_ops *ops) |
| 1364 | { |
| 1365 | if (record_debug) |
| 1366 | fprintf_unfiltered (gdb_stdlog, "Process record: " |
| 1367 | "record_mourn_inferior\n"); |
| 1368 | |
| 1369 | unpush_target (&record_ops); |
| 1370 | target_mourn_inferior (); |
| 1371 | } |
| 1372 | |
| 1373 | /* Close process record target before killing the inferior process. */ |
| 1374 | |
| 1375 | static void |
| 1376 | record_kill (struct target_ops *ops) |
| 1377 | { |
| 1378 | if (record_debug) |
| 1379 | fprintf_unfiltered (gdb_stdlog, "Process record: record_kill\n"); |
| 1380 | |
| 1381 | unpush_target (&record_ops); |
| 1382 | target_kill (); |
| 1383 | } |
| 1384 | |
| 1385 | /* Record registers change (by user or by GDB) to list as an instruction. */ |
| 1386 | |
| 1387 | static void |
| 1388 | record_registers_change (struct regcache *regcache, int regnum) |
| 1389 | { |
| 1390 | /* Check record_insn_num. */ |
| 1391 | record_check_insn_num (0); |
| 1392 | |
| 1393 | record_arch_list_head = NULL; |
| 1394 | record_arch_list_tail = NULL; |
| 1395 | |
| 1396 | if (regnum < 0) |
| 1397 | { |
| 1398 | int i; |
| 1399 | for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
| 1400 | { |
| 1401 | if (record_arch_list_add_reg (regcache, i)) |
| 1402 | { |
| 1403 | record_list_release (record_arch_list_tail); |
| 1404 | error (_("Process record: failed to record execution log.")); |
| 1405 | } |
| 1406 | } |
| 1407 | } |
| 1408 | else |
| 1409 | { |
| 1410 | if (record_arch_list_add_reg (regcache, regnum)) |
| 1411 | { |
| 1412 | record_list_release (record_arch_list_tail); |
| 1413 | error (_("Process record: failed to record execution log.")); |
| 1414 | } |
| 1415 | } |
| 1416 | if (record_arch_list_add_end ()) |
| 1417 | { |
| 1418 | record_list_release (record_arch_list_tail); |
| 1419 | error (_("Process record: failed to record execution log.")); |
| 1420 | } |
| 1421 | record_list->next = record_arch_list_head; |
| 1422 | record_arch_list_head->prev = record_list; |
| 1423 | record_list = record_arch_list_tail; |
| 1424 | |
| 1425 | if (record_insn_num == record_insn_max_num && record_insn_max_num) |
| 1426 | record_list_release_first (); |
| 1427 | else |
| 1428 | record_insn_num++; |
| 1429 | } |
| 1430 | |
| 1431 | /* "to_store_registers" method for process record target. */ |
| 1432 | |
| 1433 | static void |
| 1434 | record_store_registers (struct target_ops *ops, struct regcache *regcache, |
| 1435 | int regno) |
| 1436 | { |
| 1437 | if (!record_gdb_operation_disable) |
| 1438 | { |
| 1439 | if (RECORD_IS_REPLAY) |
| 1440 | { |
| 1441 | int n; |
| 1442 | |
| 1443 | /* Let user choose if he wants to write register or not. */ |
| 1444 | if (regno < 0) |
| 1445 | n = |
| 1446 | query (_("Because GDB is in replay mode, changing the " |
| 1447 | "value of a register will make the execution " |
| 1448 | "log unusable from this point onward. " |
| 1449 | "Change all registers?")); |
| 1450 | else |
| 1451 | n = |
| 1452 | query (_("Because GDB is in replay mode, changing the value " |
| 1453 | "of a register will make the execution log unusable " |
| 1454 | "from this point onward. Change register %s?"), |
| 1455 | gdbarch_register_name (get_regcache_arch (regcache), |
| 1456 | regno)); |
| 1457 | |
| 1458 | if (!n) |
| 1459 | { |
| 1460 | /* Invalidate the value of regcache that was set in function |
| 1461 | "regcache_raw_write". */ |
| 1462 | if (regno < 0) |
| 1463 | { |
| 1464 | int i; |
| 1465 | for (i = 0; |
| 1466 | i < gdbarch_num_regs (get_regcache_arch (regcache)); |
| 1467 | i++) |
| 1468 | regcache_invalidate (regcache, i); |
| 1469 | } |
| 1470 | else |
| 1471 | regcache_invalidate (regcache, regno); |
| 1472 | |
| 1473 | error (_("Process record canceled the operation.")); |
| 1474 | } |
| 1475 | |
| 1476 | /* Destroy the record from here forward. */ |
| 1477 | record_list_release_following (record_list); |
| 1478 | } |
| 1479 | |
| 1480 | record_registers_change (regcache, regno); |
| 1481 | } |
| 1482 | record_beneath_to_store_registers (record_beneath_to_store_registers_ops, |
| 1483 | regcache, regno); |
| 1484 | } |
| 1485 | |
| 1486 | /* "to_xfer_partial" method. Behavior is conditional on RECORD_IS_REPLAY. |
| 1487 | In replay mode, we cannot write memory unles we are willing to |
| 1488 | invalidate the record/replay log from this point forward. */ |
| 1489 | |
| 1490 | static LONGEST |
| 1491 | record_xfer_partial (struct target_ops *ops, enum target_object object, |
| 1492 | const char *annex, gdb_byte *readbuf, |
| 1493 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) |
| 1494 | { |
| 1495 | if (!record_gdb_operation_disable |
| 1496 | && (object == TARGET_OBJECT_MEMORY |
| 1497 | || object == TARGET_OBJECT_RAW_MEMORY) && writebuf) |
| 1498 | { |
| 1499 | if (RECORD_IS_REPLAY) |
| 1500 | { |
| 1501 | /* Let user choose if he wants to write memory or not. */ |
| 1502 | if (!query (_("Because GDB is in replay mode, writing to memory " |
| 1503 | "will make the execution log unusable from this " |
| 1504 | "point onward. Write memory at address %s?"), |
| 1505 | paddress (target_gdbarch, offset))) |
| 1506 | error (_("Process record canceled the operation.")); |
| 1507 | |
| 1508 | /* Destroy the record from here forward. */ |
| 1509 | record_list_release_following (record_list); |
| 1510 | } |
| 1511 | |
| 1512 | /* Check record_insn_num */ |
| 1513 | record_check_insn_num (0); |
| 1514 | |
| 1515 | /* Record registers change to list as an instruction. */ |
| 1516 | record_arch_list_head = NULL; |
| 1517 | record_arch_list_tail = NULL; |
| 1518 | if (record_arch_list_add_mem (offset, len)) |
| 1519 | { |
| 1520 | record_list_release (record_arch_list_tail); |
| 1521 | if (record_debug) |
| 1522 | fprintf_unfiltered (gdb_stdlog, |
| 1523 | "Process record: failed to record " |
| 1524 | "execution log."); |
| 1525 | return -1; |
| 1526 | } |
| 1527 | if (record_arch_list_add_end ()) |
| 1528 | { |
| 1529 | record_list_release (record_arch_list_tail); |
| 1530 | if (record_debug) |
| 1531 | fprintf_unfiltered (gdb_stdlog, |
| 1532 | "Process record: failed to record " |
| 1533 | "execution log."); |
| 1534 | return -1; |
| 1535 | } |
| 1536 | record_list->next = record_arch_list_head; |
| 1537 | record_arch_list_head->prev = record_list; |
| 1538 | record_list = record_arch_list_tail; |
| 1539 | |
| 1540 | if (record_insn_num == record_insn_max_num && record_insn_max_num) |
| 1541 | record_list_release_first (); |
| 1542 | else |
| 1543 | record_insn_num++; |
| 1544 | } |
| 1545 | |
| 1546 | return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops, |
| 1547 | object, annex, readbuf, writebuf, |
| 1548 | offset, len); |
| 1549 | } |
| 1550 | |
| 1551 | /* Behavior is conditional on RECORD_IS_REPLAY. |
| 1552 | We will not actually insert or remove breakpoints when replaying, |
| 1553 | nor when recording. */ |
| 1554 | |
| 1555 | static int |
| 1556 | record_insert_breakpoint (struct gdbarch *gdbarch, |
| 1557 | struct bp_target_info *bp_tgt) |
| 1558 | { |
| 1559 | if (!RECORD_IS_REPLAY) |
| 1560 | { |
| 1561 | struct cleanup *old_cleanups = record_gdb_operation_disable_set (); |
| 1562 | int ret = record_beneath_to_insert_breakpoint (gdbarch, bp_tgt); |
| 1563 | |
| 1564 | do_cleanups (old_cleanups); |
| 1565 | |
| 1566 | return ret; |
| 1567 | } |
| 1568 | |
| 1569 | return 0; |
| 1570 | } |
| 1571 | |
| 1572 | /* "to_remove_breakpoint" method for process record target. */ |
| 1573 | |
| 1574 | static int |
| 1575 | record_remove_breakpoint (struct gdbarch *gdbarch, |
| 1576 | struct bp_target_info *bp_tgt) |
| 1577 | { |
| 1578 | if (!RECORD_IS_REPLAY) |
| 1579 | { |
| 1580 | struct cleanup *old_cleanups = record_gdb_operation_disable_set (); |
| 1581 | int ret = record_beneath_to_remove_breakpoint (gdbarch, bp_tgt); |
| 1582 | |
| 1583 | do_cleanups (old_cleanups); |
| 1584 | |
| 1585 | return ret; |
| 1586 | } |
| 1587 | |
| 1588 | return 0; |
| 1589 | } |
| 1590 | |
| 1591 | /* "to_can_execute_reverse" method for process record target. */ |
| 1592 | |
| 1593 | static int |
| 1594 | record_can_execute_reverse (void) |
| 1595 | { |
| 1596 | return 1; |
| 1597 | } |
| 1598 | |
| 1599 | /* "to_get_bookmark" method for process record and prec over core. */ |
| 1600 | |
| 1601 | static gdb_byte * |
| 1602 | record_get_bookmark (char *args, int from_tty) |
| 1603 | { |
| 1604 | gdb_byte *ret = NULL; |
| 1605 | |
| 1606 | /* Return stringified form of instruction count. */ |
| 1607 | if (record_list && record_list->type == record_end) |
| 1608 | ret = xstrdup (pulongest (record_list->u.end.insn_num)); |
| 1609 | |
| 1610 | if (record_debug) |
| 1611 | { |
| 1612 | if (ret) |
| 1613 | fprintf_unfiltered (gdb_stdlog, |
| 1614 | "record_get_bookmark returns %s\n", ret); |
| 1615 | else |
| 1616 | fprintf_unfiltered (gdb_stdlog, |
| 1617 | "record_get_bookmark returns NULL\n"); |
| 1618 | } |
| 1619 | return ret; |
| 1620 | } |
| 1621 | |
| 1622 | /* The implementation of the command "record goto". */ |
| 1623 | static void cmd_record_goto (char *, int); |
| 1624 | |
| 1625 | /* "to_goto_bookmark" method for process record and prec over core. */ |
| 1626 | |
| 1627 | static void |
| 1628 | record_goto_bookmark (gdb_byte *bookmark, int from_tty) |
| 1629 | { |
| 1630 | if (record_debug) |
| 1631 | fprintf_unfiltered (gdb_stdlog, |
| 1632 | "record_goto_bookmark receives %s\n", bookmark); |
| 1633 | |
| 1634 | if (bookmark[0] == '\'' || bookmark[0] == '\"') |
| 1635 | { |
| 1636 | if (bookmark[strlen (bookmark) - 1] != bookmark[0]) |
| 1637 | error (_("Unbalanced quotes: %s"), bookmark); |
| 1638 | |
| 1639 | /* Strip trailing quote. */ |
| 1640 | bookmark[strlen (bookmark) - 1] = '\0'; |
| 1641 | /* Strip leading quote. */ |
| 1642 | bookmark++; |
| 1643 | /* Pass along to cmd_record_goto. */ |
| 1644 | } |
| 1645 | |
| 1646 | cmd_record_goto ((char *) bookmark, from_tty); |
| 1647 | return; |
| 1648 | } |
| 1649 | |
| 1650 | static void |
| 1651 | init_record_ops (void) |
| 1652 | { |
| 1653 | record_ops.to_shortname = "record"; |
| 1654 | record_ops.to_longname = "Process record and replay target"; |
| 1655 | record_ops.to_doc = |
| 1656 | "Log program while executing and replay execution from log."; |
| 1657 | record_ops.to_open = record_open; |
| 1658 | record_ops.to_close = record_close; |
| 1659 | record_ops.to_resume = record_resume; |
| 1660 | record_ops.to_wait = record_wait; |
| 1661 | record_ops.to_disconnect = record_disconnect; |
| 1662 | record_ops.to_detach = record_detach; |
| 1663 | record_ops.to_mourn_inferior = record_mourn_inferior; |
| 1664 | record_ops.to_kill = record_kill; |
| 1665 | record_ops.to_create_inferior = find_default_create_inferior; |
| 1666 | record_ops.to_store_registers = record_store_registers; |
| 1667 | record_ops.to_xfer_partial = record_xfer_partial; |
| 1668 | record_ops.to_insert_breakpoint = record_insert_breakpoint; |
| 1669 | record_ops.to_remove_breakpoint = record_remove_breakpoint; |
| 1670 | record_ops.to_stopped_by_watchpoint = record_stopped_by_watchpoint; |
| 1671 | record_ops.to_can_execute_reverse = record_can_execute_reverse; |
| 1672 | record_ops.to_stratum = record_stratum; |
| 1673 | /* Add bookmark target methods. */ |
| 1674 | record_ops.to_get_bookmark = record_get_bookmark; |
| 1675 | record_ops.to_goto_bookmark = record_goto_bookmark; |
| 1676 | record_ops.to_magic = OPS_MAGIC; |
| 1677 | } |
| 1678 | |
| 1679 | /* "to_resume" method for prec over corefile. */ |
| 1680 | |
| 1681 | static void |
| 1682 | record_core_resume (struct target_ops *ops, ptid_t ptid, int step, |
| 1683 | enum target_signal signal) |
| 1684 | { |
| 1685 | record_resume_step = step; |
| 1686 | } |
| 1687 | |
| 1688 | /* "to_kill" method for prec over corefile. */ |
| 1689 | |
| 1690 | static void |
| 1691 | record_core_kill (struct target_ops *ops) |
| 1692 | { |
| 1693 | if (record_debug) |
| 1694 | fprintf_unfiltered (gdb_stdlog, "Process record: record_core_kill\n"); |
| 1695 | |
| 1696 | unpush_target (&record_core_ops); |
| 1697 | } |
| 1698 | |
| 1699 | /* "to_fetch_registers" method for prec over corefile. */ |
| 1700 | |
| 1701 | static void |
| 1702 | record_core_fetch_registers (struct target_ops *ops, |
| 1703 | struct regcache *regcache, |
| 1704 | int regno) |
| 1705 | { |
| 1706 | if (regno < 0) |
| 1707 | { |
| 1708 | int num = gdbarch_num_regs (get_regcache_arch (regcache)); |
| 1709 | int i; |
| 1710 | |
| 1711 | for (i = 0; i < num; i ++) |
| 1712 | regcache_raw_supply (regcache, i, |
| 1713 | record_core_regbuf + MAX_REGISTER_SIZE * i); |
| 1714 | } |
| 1715 | else |
| 1716 | regcache_raw_supply (regcache, regno, |
| 1717 | record_core_regbuf + MAX_REGISTER_SIZE * regno); |
| 1718 | } |
| 1719 | |
| 1720 | /* "to_prepare_to_store" method for prec over corefile. */ |
| 1721 | |
| 1722 | static void |
| 1723 | record_core_prepare_to_store (struct regcache *regcache) |
| 1724 | { |
| 1725 | } |
| 1726 | |
| 1727 | /* "to_store_registers" method for prec over corefile. */ |
| 1728 | |
| 1729 | static void |
| 1730 | record_core_store_registers (struct target_ops *ops, |
| 1731 | struct regcache *regcache, |
| 1732 | int regno) |
| 1733 | { |
| 1734 | if (record_gdb_operation_disable) |
| 1735 | regcache_raw_collect (regcache, regno, |
| 1736 | record_core_regbuf + MAX_REGISTER_SIZE * regno); |
| 1737 | else |
| 1738 | error (_("You can't do that without a process to debug.")); |
| 1739 | } |
| 1740 | |
| 1741 | /* "to_xfer_partial" method for prec over corefile. */ |
| 1742 | |
| 1743 | static LONGEST |
| 1744 | record_core_xfer_partial (struct target_ops *ops, enum target_object object, |
| 1745 | const char *annex, gdb_byte *readbuf, |
| 1746 | const gdb_byte *writebuf, ULONGEST offset, |
| 1747 | LONGEST len) |
| 1748 | { |
| 1749 | if (object == TARGET_OBJECT_MEMORY) |
| 1750 | { |
| 1751 | if (record_gdb_operation_disable || !writebuf) |
| 1752 | { |
| 1753 | struct target_section *p; |
| 1754 | for (p = record_core_start; p < record_core_end; p++) |
| 1755 | { |
| 1756 | if (offset >= p->addr) |
| 1757 | { |
| 1758 | struct record_core_buf_entry *entry; |
| 1759 | ULONGEST sec_offset; |
| 1760 | |
| 1761 | if (offset >= p->endaddr) |
| 1762 | continue; |
| 1763 | |
| 1764 | if (offset + len > p->endaddr) |
| 1765 | len = p->endaddr - offset; |
| 1766 | |
| 1767 | sec_offset = offset - p->addr; |
| 1768 | |
| 1769 | /* Read readbuf or write writebuf p, offset, len. */ |
| 1770 | /* Check flags. */ |
| 1771 | if (p->the_bfd_section->flags & SEC_CONSTRUCTOR |
| 1772 | || (p->the_bfd_section->flags & SEC_HAS_CONTENTS) == 0) |
| 1773 | { |
| 1774 | if (readbuf) |
| 1775 | memset (readbuf, 0, len); |
| 1776 | return len; |
| 1777 | } |
| 1778 | /* Get record_core_buf_entry. */ |
| 1779 | for (entry = record_core_buf_list; entry; |
| 1780 | entry = entry->prev) |
| 1781 | if (entry->p == p) |
| 1782 | break; |
| 1783 | if (writebuf) |
| 1784 | { |
| 1785 | if (!entry) |
| 1786 | { |
| 1787 | /* Add a new entry. */ |
| 1788 | entry |
| 1789 | = (struct record_core_buf_entry *) |
| 1790 | xmalloc |
| 1791 | (sizeof (struct record_core_buf_entry)); |
| 1792 | entry->p = p; |
| 1793 | if (!bfd_malloc_and_get_section (p->bfd, |
| 1794 | p->the_bfd_section, |
| 1795 | &entry->buf)) |
| 1796 | { |
| 1797 | xfree (entry); |
| 1798 | return 0; |
| 1799 | } |
| 1800 | entry->prev = record_core_buf_list; |
| 1801 | record_core_buf_list = entry; |
| 1802 | } |
| 1803 | |
| 1804 | memcpy (entry->buf + sec_offset, writebuf, |
| 1805 | (size_t) len); |
| 1806 | } |
| 1807 | else |
| 1808 | { |
| 1809 | if (!entry) |
| 1810 | return record_beneath_to_xfer_partial |
| 1811 | (record_beneath_to_xfer_partial_ops, |
| 1812 | object, annex, readbuf, writebuf, |
| 1813 | offset, len); |
| 1814 | |
| 1815 | memcpy (readbuf, entry->buf + sec_offset, |
| 1816 | (size_t) len); |
| 1817 | } |
| 1818 | |
| 1819 | return len; |
| 1820 | } |
| 1821 | } |
| 1822 | |
| 1823 | return -1; |
| 1824 | } |
| 1825 | else |
| 1826 | error (_("You can't do that without a process to debug.")); |
| 1827 | } |
| 1828 | |
| 1829 | return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops, |
| 1830 | object, annex, readbuf, writebuf, |
| 1831 | offset, len); |
| 1832 | } |
| 1833 | |
| 1834 | /* "to_insert_breakpoint" method for prec over corefile. */ |
| 1835 | |
| 1836 | static int |
| 1837 | record_core_insert_breakpoint (struct gdbarch *gdbarch, |
| 1838 | struct bp_target_info *bp_tgt) |
| 1839 | { |
| 1840 | return 0; |
| 1841 | } |
| 1842 | |
| 1843 | /* "to_remove_breakpoint" method for prec over corefile. */ |
| 1844 | |
| 1845 | static int |
| 1846 | record_core_remove_breakpoint (struct gdbarch *gdbarch, |
| 1847 | struct bp_target_info *bp_tgt) |
| 1848 | { |
| 1849 | return 0; |
| 1850 | } |
| 1851 | |
| 1852 | /* "to_has_execution" method for prec over corefile. */ |
| 1853 | |
| 1854 | int |
| 1855 | record_core_has_execution (struct target_ops *ops) |
| 1856 | { |
| 1857 | return 1; |
| 1858 | } |
| 1859 | |
| 1860 | static void |
| 1861 | init_record_core_ops (void) |
| 1862 | { |
| 1863 | record_core_ops.to_shortname = "record_core"; |
| 1864 | record_core_ops.to_longname = "Process record and replay target"; |
| 1865 | record_core_ops.to_doc = |
| 1866 | "Log program while executing and replay execution from log."; |
| 1867 | record_core_ops.to_open = record_open; |
| 1868 | record_core_ops.to_close = record_close; |
| 1869 | record_core_ops.to_resume = record_core_resume; |
| 1870 | record_core_ops.to_wait = record_wait; |
| 1871 | record_core_ops.to_kill = record_core_kill; |
| 1872 | record_core_ops.to_fetch_registers = record_core_fetch_registers; |
| 1873 | record_core_ops.to_prepare_to_store = record_core_prepare_to_store; |
| 1874 | record_core_ops.to_store_registers = record_core_store_registers; |
| 1875 | record_core_ops.to_xfer_partial = record_core_xfer_partial; |
| 1876 | record_core_ops.to_insert_breakpoint = record_core_insert_breakpoint; |
| 1877 | record_core_ops.to_remove_breakpoint = record_core_remove_breakpoint; |
| 1878 | record_core_ops.to_stopped_by_watchpoint = record_stopped_by_watchpoint; |
| 1879 | record_core_ops.to_can_execute_reverse = record_can_execute_reverse; |
| 1880 | record_core_ops.to_has_execution = record_core_has_execution; |
| 1881 | record_core_ops.to_stratum = record_stratum; |
| 1882 | /* Add bookmark target methods. */ |
| 1883 | record_core_ops.to_get_bookmark = record_get_bookmark; |
| 1884 | record_core_ops.to_goto_bookmark = record_goto_bookmark; |
| 1885 | record_core_ops.to_magic = OPS_MAGIC; |
| 1886 | } |
| 1887 | |
| 1888 | /* Implement "show record debug" command. */ |
| 1889 | |
| 1890 | static void |
| 1891 | show_record_debug (struct ui_file *file, int from_tty, |
| 1892 | struct cmd_list_element *c, const char *value) |
| 1893 | { |
| 1894 | fprintf_filtered (file, _("Debugging of process record target is %s.\n"), |
| 1895 | value); |
| 1896 | } |
| 1897 | |
| 1898 | /* Alias for "target record". */ |
| 1899 | |
| 1900 | static void |
| 1901 | cmd_record_start (char *args, int from_tty) |
| 1902 | { |
| 1903 | execute_command ("target record", from_tty); |
| 1904 | } |
| 1905 | |
| 1906 | /* Truncate the record log from the present point |
| 1907 | of replay until the end. */ |
| 1908 | |
| 1909 | static void |
| 1910 | cmd_record_delete (char *args, int from_tty) |
| 1911 | { |
| 1912 | if (current_target.to_stratum == record_stratum) |
| 1913 | { |
| 1914 | if (RECORD_IS_REPLAY) |
| 1915 | { |
| 1916 | if (!from_tty || query (_("Delete the log from this point forward " |
| 1917 | "and begin to record the running message " |
| 1918 | "at current PC?"))) |
| 1919 | record_list_release_following (record_list); |
| 1920 | } |
| 1921 | else |
| 1922 | printf_unfiltered (_("Already at end of record list.\n")); |
| 1923 | |
| 1924 | } |
| 1925 | else |
| 1926 | printf_unfiltered (_("Process record is not started.\n")); |
| 1927 | } |
| 1928 | |
| 1929 | /* Implement the "stoprecord" or "record stop" command. */ |
| 1930 | |
| 1931 | static void |
| 1932 | cmd_record_stop (char *args, int from_tty) |
| 1933 | { |
| 1934 | if (current_target.to_stratum == record_stratum) |
| 1935 | { |
| 1936 | unpush_target (&record_ops); |
| 1937 | printf_unfiltered (_("Process record is stopped and all execution " |
| 1938 | "logs are deleted.\n")); |
| 1939 | } |
| 1940 | else |
| 1941 | printf_unfiltered (_("Process record is not started.\n")); |
| 1942 | } |
| 1943 | |
| 1944 | /* Set upper limit of record log size. */ |
| 1945 | |
| 1946 | static void |
| 1947 | set_record_insn_max_num (char *args, int from_tty, struct cmd_list_element *c) |
| 1948 | { |
| 1949 | if (record_insn_num > record_insn_max_num && record_insn_max_num) |
| 1950 | { |
| 1951 | /* Count down record_insn_num while releasing records from list. */ |
| 1952 | while (record_insn_num > record_insn_max_num) |
| 1953 | { |
| 1954 | record_list_release_first (); |
| 1955 | record_insn_num--; |
| 1956 | } |
| 1957 | } |
| 1958 | } |
| 1959 | |
| 1960 | static struct cmd_list_element *record_cmdlist, *set_record_cmdlist, |
| 1961 | *show_record_cmdlist, *info_record_cmdlist; |
| 1962 | |
| 1963 | static void |
| 1964 | set_record_command (char *args, int from_tty) |
| 1965 | { |
| 1966 | printf_unfiltered (_("\ |
| 1967 | \"set record\" must be followed by an apporpriate subcommand.\n")); |
| 1968 | help_list (set_record_cmdlist, "set record ", all_commands, gdb_stdout); |
| 1969 | } |
| 1970 | |
| 1971 | static void |
| 1972 | show_record_command (char *args, int from_tty) |
| 1973 | { |
| 1974 | cmd_show_list (show_record_cmdlist, from_tty, ""); |
| 1975 | } |
| 1976 | |
| 1977 | /* Display some statistics about the execution log. */ |
| 1978 | |
| 1979 | static void |
| 1980 | info_record_command (char *args, int from_tty) |
| 1981 | { |
| 1982 | struct record_entry *p; |
| 1983 | |
| 1984 | if (current_target.to_stratum == record_stratum) |
| 1985 | { |
| 1986 | if (RECORD_IS_REPLAY) |
| 1987 | printf_filtered (_("Replay mode:\n")); |
| 1988 | else |
| 1989 | printf_filtered (_("Record mode:\n")); |
| 1990 | |
| 1991 | /* Find entry for first actual instruction in the log. */ |
| 1992 | for (p = record_first.next; |
| 1993 | p != NULL && p->type != record_end; |
| 1994 | p = p->next) |
| 1995 | ; |
| 1996 | |
| 1997 | /* Do we have a log at all? */ |
| 1998 | if (p != NULL && p->type == record_end) |
| 1999 | { |
| 2000 | /* Display instruction number for first instruction in the log. */ |
| 2001 | printf_filtered (_("Lowest recorded instruction number is %s.\n"), |
| 2002 | pulongest (p->u.end.insn_num)); |
| 2003 | |
| 2004 | /* If in replay mode, display where we are in the log. */ |
| 2005 | if (RECORD_IS_REPLAY) |
| 2006 | printf_filtered (_("Current instruction number is %s.\n"), |
| 2007 | pulongest (record_list->u.end.insn_num)); |
| 2008 | |
| 2009 | /* Display instruction number for last instruction in the log. */ |
| 2010 | printf_filtered (_("Highest recorded instruction number is %s.\n"), |
| 2011 | pulongest (record_insn_count)); |
| 2012 | |
| 2013 | /* Display log count. */ |
| 2014 | printf_filtered (_("Log contains %d instructions.\n"), |
| 2015 | record_insn_num); |
| 2016 | } |
| 2017 | else |
| 2018 | { |
| 2019 | printf_filtered (_("No instructions have been logged.\n")); |
| 2020 | } |
| 2021 | } |
| 2022 | else |
| 2023 | { |
| 2024 | printf_filtered (_("target record is not active.\n")); |
| 2025 | } |
| 2026 | |
| 2027 | /* Display max log size. */ |
| 2028 | printf_filtered (_("Max logged instructions is %d.\n"), |
| 2029 | record_insn_max_num); |
| 2030 | } |
| 2031 | |
| 2032 | /* Record log save-file format |
| 2033 | Version 1 (never released) |
| 2034 | |
| 2035 | Header: |
| 2036 | 4 bytes: magic number htonl(0x20090829). |
| 2037 | NOTE: be sure to change whenever this file format changes! |
| 2038 | |
| 2039 | Records: |
| 2040 | record_end: |
| 2041 | 1 byte: record type (record_end, see enum record_type). |
| 2042 | record_reg: |
| 2043 | 1 byte: record type (record_reg, see enum record_type). |
| 2044 | 8 bytes: register id (network byte order). |
| 2045 | MAX_REGISTER_SIZE bytes: register value. |
| 2046 | record_mem: |
| 2047 | 1 byte: record type (record_mem, see enum record_type). |
| 2048 | 8 bytes: memory length (network byte order). |
| 2049 | 8 bytes: memory address (network byte order). |
| 2050 | n bytes: memory value (n == memory length). |
| 2051 | |
| 2052 | Version 2 |
| 2053 | 4 bytes: magic number netorder32(0x20091016). |
| 2054 | NOTE: be sure to change whenever this file format changes! |
| 2055 | |
| 2056 | Records: |
| 2057 | record_end: |
| 2058 | 1 byte: record type (record_end, see enum record_type). |
| 2059 | 4 bytes: signal |
| 2060 | 4 bytes: instruction count |
| 2061 | record_reg: |
| 2062 | 1 byte: record type (record_reg, see enum record_type). |
| 2063 | 4 bytes: register id (network byte order). |
| 2064 | n bytes: register value (n == actual register size). |
| 2065 | (eg. 4 bytes for x86 general registers). |
| 2066 | record_mem: |
| 2067 | 1 byte: record type (record_mem, see enum record_type). |
| 2068 | 4 bytes: memory length (network byte order). |
| 2069 | 8 bytes: memory address (network byte order). |
| 2070 | n bytes: memory value (n == memory length). |
| 2071 | |
| 2072 | */ |
| 2073 | |
| 2074 | /* bfdcore_read -- read bytes from a core file section. */ |
| 2075 | |
| 2076 | static inline void |
| 2077 | bfdcore_read (bfd *obfd, asection *osec, void *buf, int len, int *offset) |
| 2078 | { |
| 2079 | int ret = bfd_get_section_contents (obfd, osec, buf, *offset, len); |
| 2080 | |
| 2081 | if (ret) |
| 2082 | *offset += len; |
| 2083 | else |
| 2084 | error (_("Failed to read %d bytes from core file %s ('%s').\n"), |
| 2085 | len, bfd_get_filename (obfd), |
| 2086 | bfd_errmsg (bfd_get_error ())); |
| 2087 | } |
| 2088 | |
| 2089 | static inline uint64_t |
| 2090 | netorder64 (uint64_t input) |
| 2091 | { |
| 2092 | uint64_t ret; |
| 2093 | |
| 2094 | store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret), |
| 2095 | BFD_ENDIAN_BIG, input); |
| 2096 | return ret; |
| 2097 | } |
| 2098 | |
| 2099 | static inline uint32_t |
| 2100 | netorder32 (uint32_t input) |
| 2101 | { |
| 2102 | uint32_t ret; |
| 2103 | |
| 2104 | store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret), |
| 2105 | BFD_ENDIAN_BIG, input); |
| 2106 | return ret; |
| 2107 | } |
| 2108 | |
| 2109 | static inline uint16_t |
| 2110 | netorder16 (uint16_t input) |
| 2111 | { |
| 2112 | uint16_t ret; |
| 2113 | |
| 2114 | store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret), |
| 2115 | BFD_ENDIAN_BIG, input); |
| 2116 | return ret; |
| 2117 | } |
| 2118 | |
| 2119 | /* Restore the execution log from a core_bfd file. */ |
| 2120 | static void |
| 2121 | record_restore (void) |
| 2122 | { |
| 2123 | uint32_t magic; |
| 2124 | struct cleanup *old_cleanups; |
| 2125 | struct record_entry *rec; |
| 2126 | asection *osec; |
| 2127 | uint32_t osec_size; |
| 2128 | int bfd_offset = 0; |
| 2129 | struct regcache *regcache; |
| 2130 | |
| 2131 | /* We restore the execution log from the open core bfd, |
| 2132 | if there is one. */ |
| 2133 | if (core_bfd == NULL) |
| 2134 | return; |
| 2135 | |
| 2136 | /* "record_restore" can only be called when record list is empty. */ |
| 2137 | gdb_assert (record_first.next == NULL); |
| 2138 | |
| 2139 | if (record_debug) |
| 2140 | fprintf_unfiltered (gdb_stdlog, "Restoring recording from core file.\n"); |
| 2141 | |
| 2142 | /* Now need to find our special note section. */ |
| 2143 | osec = bfd_get_section_by_name (core_bfd, "null0"); |
| 2144 | osec_size = bfd_section_size (core_bfd, osec); |
| 2145 | if (record_debug) |
| 2146 | fprintf_unfiltered (gdb_stdlog, "Find precord section %s.\n", |
| 2147 | osec ? "succeeded" : "failed"); |
| 2148 | if (osec == NULL) |
| 2149 | return; |
| 2150 | if (record_debug) |
| 2151 | fprintf_unfiltered (gdb_stdlog, "%s", bfd_section_name (core_bfd, osec)); |
| 2152 | |
| 2153 | /* Check the magic code. */ |
| 2154 | bfdcore_read (core_bfd, osec, &magic, sizeof (magic), &bfd_offset); |
| 2155 | if (magic != RECORD_FILE_MAGIC) |
| 2156 | error (_("Version mis-match or file format error in core file %s."), |
| 2157 | bfd_get_filename (core_bfd)); |
| 2158 | if (record_debug) |
| 2159 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2160 | Reading 4-byte magic cookie RECORD_FILE_MAGIC (0x%s)\n", |
| 2161 | phex_nz (netorder32 (magic), 4)); |
| 2162 | |
| 2163 | /* Restore the entries in recfd into record_arch_list_head and |
| 2164 | record_arch_list_tail. */ |
| 2165 | record_arch_list_head = NULL; |
| 2166 | record_arch_list_tail = NULL; |
| 2167 | record_insn_num = 0; |
| 2168 | old_cleanups = make_cleanup (record_arch_list_cleanups, 0); |
| 2169 | regcache = get_current_regcache (); |
| 2170 | |
| 2171 | while (1) |
| 2172 | { |
| 2173 | int ret; |
| 2174 | uint8_t tmpu8; |
| 2175 | uint32_t regnum, len, signal, count; |
| 2176 | uint64_t addr; |
| 2177 | |
| 2178 | /* We are finished when offset reaches osec_size. */ |
| 2179 | if (bfd_offset >= osec_size) |
| 2180 | break; |
| 2181 | bfdcore_read (core_bfd, osec, &tmpu8, sizeof (tmpu8), &bfd_offset); |
| 2182 | |
| 2183 | switch (tmpu8) |
| 2184 | { |
| 2185 | case record_reg: /* reg */ |
| 2186 | /* Get register number to regnum. */ |
| 2187 | bfdcore_read (core_bfd, osec, ®num, |
| 2188 | sizeof (regnum), &bfd_offset); |
| 2189 | regnum = netorder32 (regnum); |
| 2190 | |
| 2191 | rec = record_reg_alloc (regcache, regnum); |
| 2192 | |
| 2193 | /* Get val. */ |
| 2194 | bfdcore_read (core_bfd, osec, record_get_loc (rec), |
| 2195 | rec->u.reg.len, &bfd_offset); |
| 2196 | |
| 2197 | if (record_debug) |
| 2198 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2199 | Reading register %d (1 plus %lu plus %d bytes)\n", |
| 2200 | rec->u.reg.num, |
| 2201 | (unsigned long) sizeof (regnum), |
| 2202 | rec->u.reg.len); |
| 2203 | break; |
| 2204 | |
| 2205 | case record_mem: /* mem */ |
| 2206 | /* Get len. */ |
| 2207 | bfdcore_read (core_bfd, osec, &len, |
| 2208 | sizeof (len), &bfd_offset); |
| 2209 | len = netorder32 (len); |
| 2210 | |
| 2211 | /* Get addr. */ |
| 2212 | bfdcore_read (core_bfd, osec, &addr, |
| 2213 | sizeof (addr), &bfd_offset); |
| 2214 | addr = netorder64 (addr); |
| 2215 | |
| 2216 | rec = record_mem_alloc (addr, len); |
| 2217 | |
| 2218 | /* Get val. */ |
| 2219 | bfdcore_read (core_bfd, osec, record_get_loc (rec), |
| 2220 | rec->u.mem.len, &bfd_offset); |
| 2221 | |
| 2222 | if (record_debug) |
| 2223 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2224 | Reading memory %s (1 plus %lu plus %lu plus %d bytes)\n", |
| 2225 | paddress (get_current_arch (), |
| 2226 | rec->u.mem.addr), |
| 2227 | (unsigned long) sizeof (addr), |
| 2228 | (unsigned long) sizeof (len), |
| 2229 | rec->u.mem.len); |
| 2230 | break; |
| 2231 | |
| 2232 | case record_end: /* end */ |
| 2233 | rec = record_end_alloc (); |
| 2234 | record_insn_num ++; |
| 2235 | |
| 2236 | /* Get signal value. */ |
| 2237 | bfdcore_read (core_bfd, osec, &signal, |
| 2238 | sizeof (signal), &bfd_offset); |
| 2239 | signal = netorder32 (signal); |
| 2240 | rec->u.end.sigval = signal; |
| 2241 | |
| 2242 | /* Get insn count. */ |
| 2243 | bfdcore_read (core_bfd, osec, &count, |
| 2244 | sizeof (count), &bfd_offset); |
| 2245 | count = netorder32 (count); |
| 2246 | rec->u.end.insn_num = count; |
| 2247 | record_insn_count = count + 1; |
| 2248 | if (record_debug) |
| 2249 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2250 | Reading record_end (1 + %lu + %lu bytes), offset == %s\n", |
| 2251 | (unsigned long) sizeof (signal), |
| 2252 | (unsigned long) sizeof (count), |
| 2253 | paddress (get_current_arch (), |
| 2254 | bfd_offset)); |
| 2255 | break; |
| 2256 | |
| 2257 | default: |
| 2258 | error (_("Bad entry type in core file %s."), |
| 2259 | bfd_get_filename (core_bfd)); |
| 2260 | break; |
| 2261 | } |
| 2262 | |
| 2263 | /* Add rec to record arch list. */ |
| 2264 | record_arch_list_add (rec); |
| 2265 | } |
| 2266 | |
| 2267 | discard_cleanups (old_cleanups); |
| 2268 | |
| 2269 | /* Add record_arch_list_head to the end of record list. */ |
| 2270 | record_first.next = record_arch_list_head; |
| 2271 | record_arch_list_head->prev = &record_first; |
| 2272 | record_arch_list_tail->next = NULL; |
| 2273 | record_list = &record_first; |
| 2274 | |
| 2275 | /* Update record_insn_max_num. */ |
| 2276 | if (record_insn_num > record_insn_max_num) |
| 2277 | { |
| 2278 | record_insn_max_num = record_insn_num; |
| 2279 | warning (_("Auto increase record/replay buffer limit to %d."), |
| 2280 | record_insn_max_num); |
| 2281 | } |
| 2282 | |
| 2283 | /* Succeeded. */ |
| 2284 | printf_filtered (_("Restored records from core file %s.\n"), |
| 2285 | bfd_get_filename (core_bfd)); |
| 2286 | |
| 2287 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 2288 | } |
| 2289 | |
| 2290 | /* bfdcore_write -- write bytes into a core file section. */ |
| 2291 | |
| 2292 | static inline void |
| 2293 | bfdcore_write (bfd *obfd, asection *osec, void *buf, int len, int *offset) |
| 2294 | { |
| 2295 | int ret = bfd_set_section_contents (obfd, osec, buf, *offset, len); |
| 2296 | |
| 2297 | if (ret) |
| 2298 | *offset += len; |
| 2299 | else |
| 2300 | error (_("Failed to write %d bytes to core file %s ('%s').\n"), |
| 2301 | len, bfd_get_filename (obfd), |
| 2302 | bfd_errmsg (bfd_get_error ())); |
| 2303 | } |
| 2304 | |
| 2305 | /* Restore the execution log from a file. We use a modified elf |
| 2306 | corefile format, with an extra section for our data. */ |
| 2307 | |
| 2308 | static void |
| 2309 | cmd_record_restore (char *args, int from_tty) |
| 2310 | { |
| 2311 | core_file_command (args, from_tty); |
| 2312 | record_open (args, from_tty); |
| 2313 | } |
| 2314 | |
| 2315 | static void |
| 2316 | record_save_cleanups (void *data) |
| 2317 | { |
| 2318 | bfd *obfd = data; |
| 2319 | char *pathname = xstrdup (bfd_get_filename (obfd)); |
| 2320 | bfd_close (obfd); |
| 2321 | unlink (pathname); |
| 2322 | xfree (pathname); |
| 2323 | } |
| 2324 | |
| 2325 | /* Save the execution log to a file. We use a modified elf corefile |
| 2326 | format, with an extra section for our data. */ |
| 2327 | |
| 2328 | static void |
| 2329 | cmd_record_save (char *args, int from_tty) |
| 2330 | { |
| 2331 | char *recfilename, recfilename_buffer[40]; |
| 2332 | int recfd; |
| 2333 | struct record_entry *cur_record_list; |
| 2334 | uint32_t magic; |
| 2335 | struct regcache *regcache; |
| 2336 | struct gdbarch *gdbarch; |
| 2337 | struct cleanup *old_cleanups; |
| 2338 | struct cleanup *set_cleanups; |
| 2339 | bfd *obfd; |
| 2340 | int save_size = 0; |
| 2341 | asection *osec = NULL; |
| 2342 | int bfd_offset = 0; |
| 2343 | |
| 2344 | if (strcmp (current_target.to_shortname, "record") != 0) |
| 2345 | error (_("This command can only be used with target 'record'.\n" |
| 2346 | "Use 'target record' first.\n")); |
| 2347 | |
| 2348 | if (args && *args) |
| 2349 | recfilename = args; |
| 2350 | else |
| 2351 | { |
| 2352 | /* Default recfile name is "gdb_record.PID". */ |
| 2353 | snprintf (recfilename_buffer, sizeof (recfilename_buffer), |
| 2354 | "gdb_record.%d", PIDGET (inferior_ptid)); |
| 2355 | recfilename = recfilename_buffer; |
| 2356 | } |
| 2357 | |
| 2358 | /* Open the save file. */ |
| 2359 | if (record_debug) |
| 2360 | fprintf_unfiltered (gdb_stdlog, "Saving execution log to core file '%s'\n", |
| 2361 | recfilename); |
| 2362 | |
| 2363 | /* Open the output file. */ |
| 2364 | obfd = create_gcore_bfd (recfilename); |
| 2365 | old_cleanups = make_cleanup (record_save_cleanups, obfd); |
| 2366 | |
| 2367 | /* Save the current record entry to "cur_record_list". */ |
| 2368 | cur_record_list = record_list; |
| 2369 | |
| 2370 | /* Get the values of regcache and gdbarch. */ |
| 2371 | regcache = get_current_regcache (); |
| 2372 | gdbarch = get_regcache_arch (regcache); |
| 2373 | |
| 2374 | /* Disable the GDB operation record. */ |
| 2375 | set_cleanups = record_gdb_operation_disable_set (); |
| 2376 | |
| 2377 | /* Reverse execute to the begin of record list. */ |
| 2378 | while (1) |
| 2379 | { |
| 2380 | /* Check for beginning and end of log. */ |
| 2381 | if (record_list == &record_first) |
| 2382 | break; |
| 2383 | |
| 2384 | record_exec_insn (regcache, gdbarch, record_list); |
| 2385 | |
| 2386 | if (record_list->prev) |
| 2387 | record_list = record_list->prev; |
| 2388 | } |
| 2389 | |
| 2390 | /* Compute the size needed for the extra bfd section. */ |
| 2391 | save_size = 4; /* magic cookie */ |
| 2392 | for (record_list = record_first.next; record_list; |
| 2393 | record_list = record_list->next) |
| 2394 | switch (record_list->type) |
| 2395 | { |
| 2396 | case record_end: |
| 2397 | save_size += 1 + 4 + 4; |
| 2398 | break; |
| 2399 | case record_reg: |
| 2400 | save_size += 1 + 4 + record_list->u.reg.len; |
| 2401 | break; |
| 2402 | case record_mem: |
| 2403 | save_size += 1 + 4 + 8 + record_list->u.mem.len; |
| 2404 | break; |
| 2405 | } |
| 2406 | |
| 2407 | /* Make the new bfd section. */ |
| 2408 | osec = bfd_make_section_anyway_with_flags (obfd, "precord", |
| 2409 | SEC_HAS_CONTENTS |
| 2410 | | SEC_READONLY); |
| 2411 | if (osec == NULL) |
| 2412 | error (_("Failed to create 'precord' section for corefile %s: %s"), |
| 2413 | recfilename, |
| 2414 | bfd_errmsg (bfd_get_error ())); |
| 2415 | bfd_set_section_size (obfd, osec, save_size); |
| 2416 | bfd_set_section_vma (obfd, osec, 0); |
| 2417 | bfd_set_section_alignment (obfd, osec, 0); |
| 2418 | bfd_section_lma (obfd, osec) = 0; |
| 2419 | |
| 2420 | /* Save corefile state. */ |
| 2421 | write_gcore_file (obfd); |
| 2422 | |
| 2423 | /* Write out the record log. */ |
| 2424 | /* Write the magic code. */ |
| 2425 | magic = RECORD_FILE_MAGIC; |
| 2426 | if (record_debug) |
| 2427 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2428 | Writing 4-byte magic cookie RECORD_FILE_MAGIC (0x%s)\n", |
| 2429 | phex_nz (magic, 4)); |
| 2430 | bfdcore_write (obfd, osec, &magic, sizeof (magic), &bfd_offset); |
| 2431 | |
| 2432 | /* Save the entries to recfd and forward execute to the end of |
| 2433 | record list. */ |
| 2434 | record_list = &record_first; |
| 2435 | while (1) |
| 2436 | { |
| 2437 | /* Save entry. */ |
| 2438 | if (record_list != &record_first) |
| 2439 | { |
| 2440 | uint8_t type; |
| 2441 | uint32_t regnum, len, signal, count; |
| 2442 | uint64_t addr; |
| 2443 | |
| 2444 | type = record_list->type; |
| 2445 | bfdcore_write (obfd, osec, &type, sizeof (type), &bfd_offset); |
| 2446 | |
| 2447 | switch (record_list->type) |
| 2448 | { |
| 2449 | case record_reg: /* reg */ |
| 2450 | if (record_debug) |
| 2451 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2452 | Writing register %d (1 plus %lu plus %d bytes)\n", |
| 2453 | record_list->u.reg.num, |
| 2454 | (unsigned long) sizeof (regnum), |
| 2455 | record_list->u.reg.len); |
| 2456 | |
| 2457 | /* Write regnum. */ |
| 2458 | regnum = netorder32 (record_list->u.reg.num); |
| 2459 | bfdcore_write (obfd, osec, ®num, |
| 2460 | sizeof (regnum), &bfd_offset); |
| 2461 | |
| 2462 | /* Write regval. */ |
| 2463 | bfdcore_write (obfd, osec, record_get_loc (record_list), |
| 2464 | record_list->u.reg.len, &bfd_offset); |
| 2465 | break; |
| 2466 | |
| 2467 | case record_mem: /* mem */ |
| 2468 | if (record_debug) |
| 2469 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2470 | Writing memory %s (1 plus %lu plus %lu plus %d bytes)\n", |
| 2471 | paddress (gdbarch, |
| 2472 | record_list->u.mem.addr), |
| 2473 | (unsigned long) sizeof (addr), |
| 2474 | (unsigned long) sizeof (len), |
| 2475 | record_list->u.mem.len); |
| 2476 | |
| 2477 | /* Write memlen. */ |
| 2478 | len = netorder32 (record_list->u.mem.len); |
| 2479 | bfdcore_write (obfd, osec, &len, sizeof (len), &bfd_offset); |
| 2480 | |
| 2481 | /* Write memaddr. */ |
| 2482 | addr = netorder64 (record_list->u.mem.addr); |
| 2483 | bfdcore_write (obfd, osec, &addr, |
| 2484 | sizeof (addr), &bfd_offset); |
| 2485 | |
| 2486 | /* Write memval. */ |
| 2487 | bfdcore_write (obfd, osec, record_get_loc (record_list), |
| 2488 | record_list->u.mem.len, &bfd_offset); |
| 2489 | break; |
| 2490 | |
| 2491 | case record_end: |
| 2492 | if (record_debug) |
| 2493 | fprintf_unfiltered (gdb_stdlog, "\ |
| 2494 | Writing record_end (1 + %lu + %lu bytes)\n", |
| 2495 | (unsigned long) sizeof (signal), |
| 2496 | (unsigned long) sizeof (count)); |
| 2497 | /* Write signal value. */ |
| 2498 | signal = netorder32 (record_list->u.end.sigval); |
| 2499 | bfdcore_write (obfd, osec, &signal, |
| 2500 | sizeof (signal), &bfd_offset); |
| 2501 | |
| 2502 | /* Write insn count. */ |
| 2503 | count = netorder32 (record_list->u.end.insn_num); |
| 2504 | bfdcore_write (obfd, osec, &count, |
| 2505 | sizeof (count), &bfd_offset); |
| 2506 | break; |
| 2507 | } |
| 2508 | } |
| 2509 | |
| 2510 | /* Execute entry. */ |
| 2511 | record_exec_insn (regcache, gdbarch, record_list); |
| 2512 | |
| 2513 | if (record_list->next) |
| 2514 | record_list = record_list->next; |
| 2515 | else |
| 2516 | break; |
| 2517 | } |
| 2518 | |
| 2519 | /* Reverse execute to cur_record_list. */ |
| 2520 | while (1) |
| 2521 | { |
| 2522 | /* Check for beginning and end of log. */ |
| 2523 | if (record_list == cur_record_list) |
| 2524 | break; |
| 2525 | |
| 2526 | record_exec_insn (regcache, gdbarch, record_list); |
| 2527 | |
| 2528 | if (record_list->prev) |
| 2529 | record_list = record_list->prev; |
| 2530 | } |
| 2531 | |
| 2532 | do_cleanups (set_cleanups); |
| 2533 | bfd_close (obfd); |
| 2534 | discard_cleanups (old_cleanups); |
| 2535 | |
| 2536 | /* Succeeded. */ |
| 2537 | printf_filtered (_("Saved core file %s with execution log.\n"), |
| 2538 | recfilename); |
| 2539 | } |
| 2540 | |
| 2541 | /* record_goto_insn -- rewind the record log (forward or backward, |
| 2542 | depending on DIR) to the given entry, changing the program state |
| 2543 | correspondingly. */ |
| 2544 | |
| 2545 | static void |
| 2546 | record_goto_insn (struct record_entry *entry, |
| 2547 | enum exec_direction_kind dir) |
| 2548 | { |
| 2549 | struct cleanup *set_cleanups = record_gdb_operation_disable_set (); |
| 2550 | struct regcache *regcache = get_current_regcache (); |
| 2551 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 2552 | |
| 2553 | /* Assume everything is valid: we will hit the entry, |
| 2554 | and we will not hit the end of the recording. */ |
| 2555 | |
| 2556 | if (dir == EXEC_FORWARD) |
| 2557 | record_list = record_list->next; |
| 2558 | |
| 2559 | do |
| 2560 | { |
| 2561 | record_exec_insn (regcache, gdbarch, record_list); |
| 2562 | if (dir == EXEC_REVERSE) |
| 2563 | record_list = record_list->prev; |
| 2564 | else |
| 2565 | record_list = record_list->next; |
| 2566 | } while (record_list != entry); |
| 2567 | do_cleanups (set_cleanups); |
| 2568 | } |
| 2569 | |
| 2570 | /* "record goto" command. Argument is an instruction number, |
| 2571 | as given by "info record". |
| 2572 | |
| 2573 | Rewinds the recording (forward or backward) to the given instruction. */ |
| 2574 | |
| 2575 | static void |
| 2576 | cmd_record_goto (char *arg, int from_tty) |
| 2577 | { |
| 2578 | struct record_entry *p = NULL; |
| 2579 | ULONGEST target_insn = 0; |
| 2580 | |
| 2581 | if (arg == NULL || *arg == '\0') |
| 2582 | error (_("Command requires an argument (insn number to go to).")); |
| 2583 | |
| 2584 | if (strncmp (arg, "start", strlen ("start")) == 0 |
| 2585 | || strncmp (arg, "begin", strlen ("begin")) == 0) |
| 2586 | { |
| 2587 | /* Special case. Find first insn. */ |
| 2588 | for (p = &record_first; p != NULL; p = p->next) |
| 2589 | if (p->type == record_end) |
| 2590 | break; |
| 2591 | if (p) |
| 2592 | target_insn = p->u.end.insn_num; |
| 2593 | } |
| 2594 | else if (strncmp (arg, "end", strlen ("end")) == 0) |
| 2595 | { |
| 2596 | /* Special case. Find last insn. */ |
| 2597 | for (p = record_list; p->next != NULL; p = p->next) |
| 2598 | ; |
| 2599 | for (; p!= NULL; p = p->prev) |
| 2600 | if (p->type == record_end) |
| 2601 | break; |
| 2602 | if (p) |
| 2603 | target_insn = p->u.end.insn_num; |
| 2604 | } |
| 2605 | else |
| 2606 | { |
| 2607 | /* General case. Find designated insn. */ |
| 2608 | target_insn = parse_and_eval_long (arg); |
| 2609 | |
| 2610 | for (p = &record_first; p != NULL; p = p->next) |
| 2611 | if (p->type == record_end && p->u.end.insn_num == target_insn) |
| 2612 | break; |
| 2613 | } |
| 2614 | |
| 2615 | if (p == NULL) |
| 2616 | error (_("Target insn '%s' not found."), arg); |
| 2617 | else if (p == record_list) |
| 2618 | error (_("Already at insn '%s'."), arg); |
| 2619 | else if (p->u.end.insn_num > record_list->u.end.insn_num) |
| 2620 | { |
| 2621 | printf_filtered (_("Go forward to insn number %s\n"), |
| 2622 | pulongest (target_insn)); |
| 2623 | record_goto_insn (p, EXEC_FORWARD); |
| 2624 | } |
| 2625 | else |
| 2626 | { |
| 2627 | printf_filtered (_("Go backward to insn number %s\n"), |
| 2628 | pulongest (target_insn)); |
| 2629 | record_goto_insn (p, EXEC_REVERSE); |
| 2630 | } |
| 2631 | registers_changed (); |
| 2632 | reinit_frame_cache (); |
| 2633 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
| 2634 | } |
| 2635 | |
| 2636 | void |
| 2637 | _initialize_record (void) |
| 2638 | { |
| 2639 | struct cmd_list_element *c; |
| 2640 | |
| 2641 | /* Init record_first. */ |
| 2642 | record_first.prev = NULL; |
| 2643 | record_first.next = NULL; |
| 2644 | record_first.type = record_end; |
| 2645 | |
| 2646 | init_record_ops (); |
| 2647 | add_target (&record_ops); |
| 2648 | init_record_core_ops (); |
| 2649 | add_target (&record_core_ops); |
| 2650 | |
| 2651 | add_setshow_zinteger_cmd ("record", no_class, &record_debug, |
| 2652 | _("Set debugging of record/replay feature."), |
| 2653 | _("Show debugging of record/replay feature."), |
| 2654 | _("When enabled, debugging output for " |
| 2655 | "record/replay feature is displayed."), |
| 2656 | NULL, show_record_debug, &setdebuglist, |
| 2657 | &showdebuglist); |
| 2658 | |
| 2659 | c = add_prefix_cmd ("record", class_obscure, cmd_record_start, |
| 2660 | _("Abbreviated form of \"target record\" command."), |
| 2661 | &record_cmdlist, "record ", 0, &cmdlist); |
| 2662 | set_cmd_completer (c, filename_completer); |
| 2663 | |
| 2664 | add_com_alias ("rec", "record", class_obscure, 1); |
| 2665 | add_prefix_cmd ("record", class_support, set_record_command, |
| 2666 | _("Set record options"), &set_record_cmdlist, |
| 2667 | "set record ", 0, &setlist); |
| 2668 | add_alias_cmd ("rec", "record", class_obscure, 1, &setlist); |
| 2669 | add_prefix_cmd ("record", class_support, show_record_command, |
| 2670 | _("Show record options"), &show_record_cmdlist, |
| 2671 | "show record ", 0, &showlist); |
| 2672 | add_alias_cmd ("rec", "record", class_obscure, 1, &showlist); |
| 2673 | add_prefix_cmd ("record", class_support, info_record_command, |
| 2674 | _("Info record options"), &info_record_cmdlist, |
| 2675 | "info record ", 0, &infolist); |
| 2676 | add_alias_cmd ("rec", "record", class_obscure, 1, &infolist); |
| 2677 | |
| 2678 | c = add_cmd ("save", class_obscure, cmd_record_save, |
| 2679 | _("Save the execution log to a file.\n\ |
| 2680 | Argument is optional filename.\n\ |
| 2681 | Default filename is 'gdb_record.<process_id>'."), |
| 2682 | &record_cmdlist); |
| 2683 | set_cmd_completer (c, filename_completer); |
| 2684 | |
| 2685 | c = add_cmd ("restore", class_obscure, cmd_record_restore, |
| 2686 | _("Restore the execution log from a file.\n\ |
| 2687 | Argument is filename. File must be created with 'record save'."), |
| 2688 | &record_cmdlist); |
| 2689 | set_cmd_completer (c, filename_completer); |
| 2690 | |
| 2691 | add_cmd ("delete", class_obscure, cmd_record_delete, |
| 2692 | _("Delete the rest of execution log and start recording it anew."), |
| 2693 | &record_cmdlist); |
| 2694 | add_alias_cmd ("d", "delete", class_obscure, 1, &record_cmdlist); |
| 2695 | add_alias_cmd ("del", "delete", class_obscure, 1, &record_cmdlist); |
| 2696 | |
| 2697 | add_cmd ("stop", class_obscure, cmd_record_stop, |
| 2698 | _("Stop the record/replay target."), |
| 2699 | &record_cmdlist); |
| 2700 | add_alias_cmd ("s", "stop", class_obscure, 1, &record_cmdlist); |
| 2701 | |
| 2702 | /* Record instructions number limit command. */ |
| 2703 | add_setshow_boolean_cmd ("stop-at-limit", no_class, |
| 2704 | &record_stop_at_limit, _("\ |
| 2705 | Set whether record/replay stops when record/replay buffer becomes full."), _("\ |
| 2706 | Show whether record/replay stops when record/replay buffer becomes full."), _("\ |
| 2707 | Default is ON.\n\ |
| 2708 | When ON, if the record/replay buffer becomes full, ask user what to do.\n\ |
| 2709 | When OFF, if the record/replay buffer becomes full,\n\ |
| 2710 | delete the oldest recorded instruction to make room for each new one."), |
| 2711 | NULL, NULL, |
| 2712 | &set_record_cmdlist, &show_record_cmdlist); |
| 2713 | add_setshow_uinteger_cmd ("insn-number-max", no_class, |
| 2714 | &record_insn_max_num, |
| 2715 | _("Set record/replay buffer limit."), |
| 2716 | _("Show record/replay buffer limit."), _("\ |
| 2717 | Set the maximum number of instructions to be stored in the\n\ |
| 2718 | record/replay buffer. Zero means unlimited. Default is 200000."), |
| 2719 | set_record_insn_max_num, |
| 2720 | NULL, &set_record_cmdlist, &show_record_cmdlist); |
| 2721 | |
| 2722 | add_cmd ("goto", class_obscure, cmd_record_goto, _("\ |
| 2723 | Restore the program to its state at instruction number N.\n\ |
| 2724 | Argument is instruction number, as shown by 'info record'."), |
| 2725 | &record_cmdlist); |
| 2726 | } |