1 /* Process record and replay target for GDB, the GNU debugger.
3 Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
23 #include "gdbthread.h"
24 #include "event-top.h"
25 #include "exceptions.h"
26 #include "completer.h"
27 #include "arch-utils.h"
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.
41 Target record has two modes: recording, and replaying.
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).
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. */
56 #define DEFAULT_RECORD_INSN_MAX_NUM 200000
58 #define RECORD_IS_REPLAY \
59 (record_list->next || execution_direction == EXEC_REVERSE)
61 #define RECORD_FILE_MAGIC netorder32(0x20091016)
63 /* These are the core structs of the process record functionality.
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
71 Each struct record_entry is linked to "record_list" by "prev" and
74 struct record_mem_entry
78 /* Set this flag if target memory for this entry
79 can no longer be accessed. */
80 int mem_entry_not_accessible
;
84 gdb_byte buf
[sizeof (gdb_byte
*)];
88 struct record_reg_entry
95 gdb_byte buf
[2 * sizeof (gdb_byte
*)];
99 struct record_end_entry
101 enum target_signal sigval
;
112 /* This is the data structure that makes up the execution log.
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.
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).
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.
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. */
138 struct record_entry
*prev
;
139 struct record_entry
*next
;
140 enum record_type type
;
144 struct record_reg_entry reg
;
146 struct record_mem_entry mem
;
148 struct record_end_entry end
;
152 /* This is the debug switch for process record. */
153 int record_debug
= 0;
155 struct record_core_buf_entry
157 struct record_core_buf_entry
*prev
;
158 struct target_section
*p
;
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
;
168 /* The following variables are used for managing the linked list that
169 represents the execution log.
171 record_first is the anchor that holds down the beginning of the list.
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.
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. */
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
;
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
;
199 /* The target_ops of process record. */
200 static struct target_ops record_ops
;
201 static struct target_ops record_core_ops
;
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,
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
*,
211 static struct target_ops
*record_beneath_to_store_registers_ops
;
212 static void (*record_beneath_to_store_registers
) (struct target_ops
*,
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
,
220 const gdb_byte
*writebuf
,
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
*,
231 /* Alloc and free functions for record_reg, record_mem, and record_end
234 /* Alloc a record_reg record entry. */
236 static inline struct record_entry
*
237 record_reg_alloc (struct regcache
*regcache
, int regnum
)
239 struct record_entry
*rec
;
240 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
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
);
252 /* Free a record_reg record entry. */
255 record_reg_release (struct record_entry
*rec
)
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
);
263 /* Alloc a record_mem record entry. */
265 static inline struct record_entry
*
266 record_mem_alloc (CORE_ADDR addr
, int len
)
268 struct record_entry
*rec
;
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
);
280 /* Free a record_mem record entry. */
283 record_mem_release (struct record_entry
*rec
)
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
);
291 /* Alloc a record_end record entry. */
293 static inline struct record_entry
*
294 record_end_alloc (void)
296 struct record_entry
*rec
;
298 rec
= (struct record_entry
*) xcalloc (1, sizeof (struct record_entry
));
299 rec
->type
= record_end
;
304 /* Free a record_end record entry. */
307 record_end_release (struct record_entry
*rec
)
312 /* Free one record entry, any type.
313 Return entry->type, in case caller wants to know. */
315 static inline enum record_type
316 record_entry_release (struct record_entry
*rec
)
318 enum record_type type
= rec
->type
;
322 record_reg_release (rec
);
325 record_mem_release (rec
);
328 record_end_release (rec
);
334 /* Free all record entries in list pointed to by REC. */
337 record_list_release (struct record_entry
*rec
)
348 record_entry_release (rec
->next
);
351 if (rec
== &record_first
)
354 record_first
.next
= NULL
;
357 record_entry_release (rec
);
360 /* Free all record entries forward of the given list position. */
363 record_list_release_following (struct record_entry
*rec
)
365 struct record_entry
*tmp
= rec
->next
;
371 if (record_entry_release (tmp
) == record_end
)
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.
383 Note -- this function does not modify record_insn_num. */
386 record_list_release_first (void)
388 struct record_entry
*tmp
;
390 if (!record_first
.next
)
393 /* Loop until a record_end. */
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
;
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. */
405 if (!record_first
.next
)
407 gdb_assert (record_insn_num
== 1);
408 break; /* End loop when list is empty. */
413 /* Add a struct record_entry to record_arch_list. */
416 record_arch_list_add (struct record_entry
*rec
)
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
));
423 if (record_arch_list_tail
)
425 record_arch_list_tail
->next
= rec
;
426 rec
->prev
= record_arch_list_tail
;
427 record_arch_list_tail
= rec
;
431 record_arch_list_head
= rec
;
432 record_arch_list_tail
= rec
;
436 /* Return the value storage location of a record entry. */
437 static inline gdb_byte
*
438 record_get_loc (struct record_entry
*rec
)
442 if (rec
->u
.mem
.len
> sizeof (rec
->u
.mem
.u
.buf
))
443 return rec
->u
.mem
.u
.ptr
;
445 return rec
->u
.mem
.u
.buf
;
447 if (rec
->u
.reg
.len
> sizeof (rec
->u
.reg
.u
.buf
))
448 return rec
->u
.reg
.u
.ptr
;
450 return rec
->u
.reg
.u
.buf
;
458 /* Record the value of a register NUM to record_arch_list. */
461 record_arch_list_add_reg (struct regcache
*regcache
, int regnum
)
463 struct record_entry
*rec
;
465 if (record_debug
> 1)
466 fprintf_unfiltered (gdb_stdlog
,
467 "Process record: add register num = %d to "
471 rec
= record_reg_alloc (regcache
, regnum
);
473 regcache_raw_read (regcache
, regnum
, record_get_loc (rec
));
475 record_arch_list_add (rec
);
480 /* Record the value of a region of memory whose address is ADDR and
481 length is LEN to record_arch_list. */
484 record_arch_list_add_mem (CORE_ADDR addr
, int len
)
486 struct record_entry
*rec
;
488 if (record_debug
> 1)
489 fprintf_unfiltered (gdb_stdlog
,
490 "Process record: add mem addr = %s len = %d to "
492 paddress (target_gdbarch
, addr
), len
);
494 if (!addr
) /* FIXME: Why? Some arch must permit it... */
497 rec
= record_mem_alloc (addr
, len
);
499 if (target_read_memory (addr
, record_get_loc (rec
), len
))
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
);
510 record_arch_list_add (rec
);
515 /* Add a record_end type struct record_entry to record_arch_list. */
518 record_arch_list_add_end (void)
520 struct record_entry
*rec
;
522 if (record_debug
> 1)
523 fprintf_unfiltered (gdb_stdlog
,
524 "Process record: add end to arch list.\n");
526 rec
= record_end_alloc ();
527 rec
->u
.end
.sigval
= TARGET_SIGNAL_0
;
528 rec
->u
.end
.insn_num
= ++record_insn_count
;
530 record_arch_list_add (rec
);
536 record_check_insn_num (int set_terminal
)
538 if (record_insn_max_num
)
540 gdb_assert (record_insn_num
<= record_insn_max_num
);
541 if (record_insn_num
== record_insn_max_num
)
543 /* Ask user what to do. */
544 if (record_stop_at_limit
)
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)?"));
553 target_terminal_inferior ();
555 record_stop_at_limit
= 0;
557 error (_("Process record: stopped by user."));
564 record_arch_list_cleanups (void *ignore
)
566 record_list_release (record_arch_list_tail
);
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. */
576 record_message (struct regcache
*regcache
, enum target_signal signal
)
579 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
580 struct cleanup
*old_cleanups
= make_cleanup (record_arch_list_cleanups
, 0);
582 record_arch_list_head
= NULL
;
583 record_arch_list_tail
= NULL
;
585 /* Check record_insn_num. */
586 record_check_insn_num (1);
588 /* If gdb sends a signal value to target_resume,
589 save it in the 'end' field of the previous instruction.
591 Maybe process record should record what really happened,
592 rather than what gdb pretends has happened.
594 So if Linux delivered the signal to the child process during
595 the record mode, we will record it and deliver it again in
598 If user says "ignore this signal" during the record mode, then
599 it will be ignored again during the replay mode (no matter if
600 the user says something different, like "deliver this signal"
601 during the replay mode).
603 User should understand that nothing he does during the replay
604 mode will change the behavior of the child. If he tries,
605 then that is a user error.
607 But we should still deliver the signal to gdb during the replay,
608 if we delivered it during the recording. Therefore we should
609 record the signal during record_wait, not record_resume. */
610 if (record_list
!= &record_first
) /* FIXME better way to check */
612 gdb_assert (record_list
->type
== record_end
);
613 record_list
->u
.end
.sigval
= signal
;
616 if (signal
== TARGET_SIGNAL_0
617 || !gdbarch_process_record_signal_p (gdbarch
))
618 ret
= gdbarch_process_record (gdbarch
,
620 regcache_read_pc (regcache
));
622 ret
= gdbarch_process_record_signal (gdbarch
,
627 error (_("Process record: inferior program stopped."));
629 error (_("Process record: failed to record execution log."));
631 discard_cleanups (old_cleanups
);
633 record_list
->next
= record_arch_list_head
;
634 record_arch_list_head
->prev
= record_list
;
635 record_list
= record_arch_list_tail
;
637 if (record_insn_num
== record_insn_max_num
&& record_insn_max_num
)
638 record_list_release_first ();
645 struct record_message_args
{
646 struct regcache
*regcache
;
647 enum target_signal signal
;
651 record_message_wrapper (void *args
)
653 struct record_message_args
*record_args
= args
;
655 return record_message (record_args
->regcache
, record_args
->signal
);
659 record_message_wrapper_safe (struct regcache
*regcache
,
660 enum target_signal signal
)
662 struct record_message_args args
;
664 args
.regcache
= regcache
;
665 args
.signal
= signal
;
667 return catch_errors (record_message_wrapper
, &args
, NULL
, RETURN_MASK_ALL
);
670 /* Set to 1 if record_store_registers and record_xfer_partial
671 doesn't need record. */
673 static int record_gdb_operation_disable
= 0;
676 record_gdb_operation_disable_set (void)
678 struct cleanup
*old_cleanups
= NULL
;
681 make_cleanup_restore_integer (&record_gdb_operation_disable
);
682 record_gdb_operation_disable
= 1;
687 /* Flag set to TRUE for target_stopped_by_watchpoint. */
688 static int record_hw_watchpoint
= 0;
690 /* Execute one instruction from the record log. Each instruction in
691 the log will be represented by an arbitrary sequence of register
692 entries and memory entries, followed by an 'end' entry. */
695 record_exec_insn (struct regcache
*regcache
, struct gdbarch
*gdbarch
,
696 struct record_entry
*entry
)
700 case record_reg
: /* reg */
702 gdb_byte reg
[MAX_REGISTER_SIZE
];
704 if (record_debug
> 1)
705 fprintf_unfiltered (gdb_stdlog
,
706 "Process record: record_reg %s to "
707 "inferior num = %d.\n",
708 host_address_to_string (entry
),
711 regcache_cooked_read (regcache
, entry
->u
.reg
.num
, reg
);
712 regcache_cooked_write (regcache
, entry
->u
.reg
.num
,
713 record_get_loc (entry
));
714 memcpy (record_get_loc (entry
), reg
, entry
->u
.reg
.len
);
718 case record_mem
: /* mem */
720 /* Nothing to do if the entry is flagged not_accessible. */
721 if (!entry
->u
.mem
.mem_entry_not_accessible
)
723 gdb_byte
*mem
= alloca (entry
->u
.mem
.len
);
725 if (record_debug
> 1)
726 fprintf_unfiltered (gdb_stdlog
,
727 "Process record: record_mem %s to "
728 "inferior addr = %s len = %d.\n",
729 host_address_to_string (entry
),
730 paddress (gdbarch
, entry
->u
.mem
.addr
),
733 if (target_read_memory (entry
->u
.mem
.addr
, mem
, entry
->u
.mem
.len
))
735 entry
->u
.mem
.mem_entry_not_accessible
= 1;
737 warning ("Process record: error reading memory at "
738 "addr = %s len = %d.",
739 paddress (gdbarch
, entry
->u
.mem
.addr
),
744 if (target_write_memory (entry
->u
.mem
.addr
,
745 record_get_loc (entry
),
748 entry
->u
.mem
.mem_entry_not_accessible
= 1;
750 warning ("Process record: error writing memory at "
751 "addr = %s len = %d.",
752 paddress (gdbarch
, entry
->u
.mem
.addr
),
757 memcpy (record_get_loc (entry
), mem
, entry
->u
.mem
.len
);
759 /* We've changed memory --- check if a hardware
760 watchpoint should trap. Note that this
761 presently assumes the target beneath supports
762 continuable watchpoints. On non-continuable
763 watchpoints target, we'll want to check this
764 _before_ actually doing the memory change, and
765 not doing the change at all if the watchpoint
767 if (hardware_watchpoint_inserted_in_range
768 (get_regcache_aspace (regcache
),
769 entry
->u
.mem
.addr
, entry
->u
.mem
.len
))
770 record_hw_watchpoint
= 1;
779 static struct target_ops
*tmp_to_resume_ops
;
780 static void (*tmp_to_resume
) (struct target_ops
*, ptid_t
, int,
782 static struct target_ops
*tmp_to_wait_ops
;
783 static ptid_t (*tmp_to_wait
) (struct target_ops
*, ptid_t
,
784 struct target_waitstatus
*,
786 static struct target_ops
*tmp_to_store_registers_ops
;
787 static void (*tmp_to_store_registers
) (struct target_ops
*,
790 static struct target_ops
*tmp_to_xfer_partial_ops
;
791 static LONGEST (*tmp_to_xfer_partial
) (struct target_ops
*ops
,
792 enum target_object object
,
795 const gdb_byte
*writebuf
,
798 static int (*tmp_to_insert_breakpoint
) (struct gdbarch
*,
799 struct bp_target_info
*);
800 static int (*tmp_to_remove_breakpoint
) (struct gdbarch
*,
801 struct bp_target_info
*);
802 static int (*tmp_to_stopped_by_watchpoint
) (void);
803 static int (*tmp_to_stopped_data_address
) (struct target_ops
*, CORE_ADDR
*);
805 static void record_restore (void);
807 /* Open the process record target. */
810 record_core_open_1 (char *name
, int from_tty
)
812 struct regcache
*regcache
= get_current_regcache ();
813 int regnum
= gdbarch_num_regs (get_regcache_arch (regcache
));
816 /* Get record_core_regbuf. */
817 target_fetch_registers (regcache
, -1);
818 record_core_regbuf
= xmalloc (MAX_REGISTER_SIZE
* regnum
);
819 for (i
= 0; i
< regnum
; i
++)
820 regcache_raw_collect (regcache
, i
,
821 record_core_regbuf
+ MAX_REGISTER_SIZE
* i
);
823 /* Get record_core_start and record_core_end. */
824 if (build_section_table (core_bfd
, &record_core_start
, &record_core_end
))
826 xfree (record_core_regbuf
);
827 record_core_regbuf
= NULL
;
828 error (_("\"%s\": Can't find sections: %s"),
829 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
832 push_target (&record_core_ops
);
836 /* "to_open" target method for 'live' processes. */
839 record_open_1 (char *name
, int from_tty
)
842 fprintf_unfiltered (gdb_stdlog
, "Process record: record_open\n");
845 if (!target_has_execution
)
846 error (_("Process record: the program is not being run."));
848 error (_("Process record target can't debug inferior in non-stop mode "
850 if (target_async_permitted
)
851 error (_("Process record target can't debug inferior in asynchronous "
852 "mode (target-async)."));
854 if (!gdbarch_process_record_p (target_gdbarch
))
855 error (_("Process record: the current architecture doesn't support "
856 "record function."));
859 error (_("Could not find 'to_resume' method on the target stack."));
861 error (_("Could not find 'to_wait' method on the target stack."));
862 if (!tmp_to_store_registers
)
863 error (_("Could not find 'to_store_registers' method on the target stack."));
864 if (!tmp_to_insert_breakpoint
)
865 error (_("Could not find 'to_insert_breakpoint' method on the target stack."));
866 if (!tmp_to_remove_breakpoint
)
867 error (_("Could not find 'to_remove_breakpoint' method on the target stack."));
868 if (!tmp_to_stopped_by_watchpoint
)
869 error (_("Could not find 'to_stopped_by_watchpoint' method on the target stack."));
870 if (!tmp_to_stopped_data_address
)
871 error (_("Could not find 'to_stopped_data_address' method on the target stack."));
873 push_target (&record_ops
);
876 /* "to_open" target method. Open the process record target. */
879 record_open (char *name
, int from_tty
)
881 struct target_ops
*t
;
884 fprintf_unfiltered (gdb_stdlog
, "Process record: record_open\n");
886 /* Check if record target is already running. */
887 if (current_target
.to_stratum
== record_stratum
)
888 error (_("Process record target already running. Use \"record stop\" to "
889 "stop record target first."));
891 /* Reset the tmp beneath pointers. */
892 tmp_to_resume_ops
= NULL
;
893 tmp_to_resume
= NULL
;
894 tmp_to_wait_ops
= NULL
;
896 tmp_to_store_registers_ops
= NULL
;
897 tmp_to_store_registers
= NULL
;
898 tmp_to_xfer_partial_ops
= NULL
;
899 tmp_to_xfer_partial
= NULL
;
900 tmp_to_insert_breakpoint
= NULL
;
901 tmp_to_remove_breakpoint
= NULL
;
902 tmp_to_stopped_by_watchpoint
= NULL
;
903 tmp_to_stopped_data_address
= NULL
;
905 /* Set the beneath function pointers. */
906 for (t
= current_target
.beneath
; t
!= NULL
; t
= t
->beneath
)
910 tmp_to_resume
= t
->to_resume
;
911 tmp_to_resume_ops
= t
;
915 tmp_to_wait
= t
->to_wait
;
918 if (!tmp_to_store_registers
)
920 tmp_to_store_registers
= t
->to_store_registers
;
921 tmp_to_store_registers_ops
= t
;
923 if (!tmp_to_xfer_partial
)
925 tmp_to_xfer_partial
= t
->to_xfer_partial
;
926 tmp_to_xfer_partial_ops
= t
;
928 if (!tmp_to_insert_breakpoint
)
929 tmp_to_insert_breakpoint
= t
->to_insert_breakpoint
;
930 if (!tmp_to_remove_breakpoint
)
931 tmp_to_remove_breakpoint
= t
->to_remove_breakpoint
;
932 if (!tmp_to_stopped_by_watchpoint
)
933 tmp_to_stopped_by_watchpoint
= t
->to_stopped_by_watchpoint
;
934 if (!tmp_to_stopped_data_address
)
935 tmp_to_stopped_data_address
= t
->to_stopped_data_address
;
937 if (!tmp_to_xfer_partial
)
938 error (_("Could not find 'to_xfer_partial' method on the target stack."));
942 record_insn_count
= 0;
943 record_list
= &record_first
;
944 record_list
->next
= NULL
;
946 /* Set the tmp beneath pointers to beneath pointers. */
947 record_beneath_to_resume_ops
= tmp_to_resume_ops
;
948 record_beneath_to_resume
= tmp_to_resume
;
949 record_beneath_to_wait_ops
= tmp_to_wait_ops
;
950 record_beneath_to_wait
= tmp_to_wait
;
951 record_beneath_to_store_registers_ops
= tmp_to_store_registers_ops
;
952 record_beneath_to_store_registers
= tmp_to_store_registers
;
953 record_beneath_to_xfer_partial_ops
= tmp_to_xfer_partial_ops
;
954 record_beneath_to_xfer_partial
= tmp_to_xfer_partial
;
955 record_beneath_to_insert_breakpoint
= tmp_to_insert_breakpoint
;
956 record_beneath_to_remove_breakpoint
= tmp_to_remove_breakpoint
;
957 record_beneath_to_stopped_by_watchpoint
= tmp_to_stopped_by_watchpoint
;
958 record_beneath_to_stopped_data_address
= tmp_to_stopped_data_address
;
960 if (current_target
.to_stratum
== core_stratum
)
961 record_core_open_1 (name
, from_tty
);
963 record_open_1 (name
, from_tty
);
966 /* "to_close" target method. Close the process record target. */
969 record_close (int quitting
)
971 struct record_core_buf_entry
*entry
;
974 fprintf_unfiltered (gdb_stdlog
, "Process record: record_close\n");
976 record_list_release (record_list
);
978 /* Release record_core_regbuf. */
979 if (record_core_regbuf
)
981 xfree (record_core_regbuf
);
982 record_core_regbuf
= NULL
;
985 /* Release record_core_buf_list. */
986 if (record_core_buf_list
)
988 for (entry
= record_core_buf_list
->prev
; entry
; entry
= entry
->prev
)
990 xfree (record_core_buf_list
);
991 record_core_buf_list
= entry
;
993 record_core_buf_list
= NULL
;
997 static int record_resume_step
= 0;
999 /* "to_resume" target method. Resume the process record target. */
1002 record_resume (struct target_ops
*ops
, ptid_t ptid
, int step
,
1003 enum target_signal signal
)
1005 record_resume_step
= step
;
1007 if (!RECORD_IS_REPLAY
)
1009 record_message (get_current_regcache (), signal
);
1010 record_beneath_to_resume (record_beneath_to_resume_ops
, ptid
, 1,
1015 static int record_get_sig
= 0;
1017 /* SIGINT signal handler, registered by "to_wait" method. */
1020 record_sig_handler (int signo
)
1023 fprintf_unfiltered (gdb_stdlog
, "Process record: get a signal\n");
1025 /* It will break the running inferior in replay mode. */
1026 record_resume_step
= 1;
1028 /* It will let record_wait set inferior status to get the signal
1034 record_wait_cleanups (void *ignore
)
1036 if (execution_direction
== EXEC_REVERSE
)
1038 if (record_list
->next
)
1039 record_list
= record_list
->next
;
1042 record_list
= record_list
->prev
;
1045 /* "to_wait" target method for process record target.
1047 In record mode, the target is always run in singlestep mode
1048 (even when gdb says to continue). The to_wait method intercepts
1049 the stop events and determines which ones are to be passed on to
1050 gdb. Most stop events are just singlestep events that gdb is not
1051 to know about, so the to_wait method just records them and keeps
1054 In replay mode, this function emulates the recorded execution log,
1055 one instruction at a time (forward or backward), and determines
1059 record_wait (struct target_ops
*ops
,
1060 ptid_t ptid
, struct target_waitstatus
*status
,
1063 struct cleanup
*set_cleanups
= record_gdb_operation_disable_set ();
1066 fprintf_unfiltered (gdb_stdlog
,
1067 "Process record: record_wait "
1068 "record_resume_step = %d\n",
1069 record_resume_step
);
1071 if (!RECORD_IS_REPLAY
&& ops
!= &record_core_ops
)
1073 if (record_resume_step
)
1075 /* This is a single step. */
1076 return record_beneath_to_wait (record_beneath_to_wait_ops
,
1077 ptid
, status
, options
);
1081 /* This is not a single step. */
1087 ret
= record_beneath_to_wait (record_beneath_to_wait_ops
,
1088 ptid
, status
, options
);
1090 /* Is this a SIGTRAP? */
1091 if (status
->kind
== TARGET_WAITKIND_STOPPED
1092 && status
->value
.sig
== TARGET_SIGNAL_TRAP
)
1094 struct regcache
*regcache
;
1095 struct address_space
*aspace
;
1097 /* Yes -- this is likely our single-step finishing,
1098 but check if there's any reason the core would be
1099 interested in the event. */
1101 registers_changed ();
1102 regcache
= get_current_regcache ();
1103 tmp_pc
= regcache_read_pc (regcache
);
1104 aspace
= get_regcache_aspace (regcache
);
1106 if (target_stopped_by_watchpoint ())
1108 /* Always interested in watchpoints. */
1110 else if (breakpoint_inserted_here_p (aspace
, tmp_pc
))
1112 /* There is a breakpoint here. Let the core
1114 if (software_breakpoint_inserted_here_p (aspace
, tmp_pc
))
1116 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1117 CORE_ADDR decr_pc_after_break
1118 = gdbarch_decr_pc_after_break (gdbarch
);
1119 if (decr_pc_after_break
)
1120 regcache_write_pc (regcache
,
1121 tmp_pc
+ decr_pc_after_break
);
1126 /* This must be a single-step trap. Record the
1127 insn and issue another step. */
1128 if (!record_message_wrapper_safe (regcache
,
1131 status
->kind
= TARGET_WAITKIND_STOPPED
;
1132 status
->value
.sig
= TARGET_SIGNAL_0
;
1136 record_beneath_to_resume (record_beneath_to_resume_ops
,
1143 /* The inferior is broken by a breakpoint or a signal. */
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);
1160 record_hw_watchpoint
= 0;
1161 status
->kind
= TARGET_WAITKIND_STOPPED
;
1163 /* Check breakpoint when forward execute. */
1164 if (execution_direction
== EXEC_FORWARD
)
1166 tmp_pc
= regcache_read_pc (regcache
);
1167 if (breakpoint_inserted_here_p (aspace
, tmp_pc
))
1169 int decr_pc_after_break
= gdbarch_decr_pc_after_break (gdbarch
);
1172 fprintf_unfiltered (gdb_stdlog
,
1173 "Process record: break at %s.\n",
1174 paddress (gdbarch
, tmp_pc
));
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
);
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 ();
1193 /* In EXEC_FORWARD mode, record_list points to the tail of prev
1195 if (execution_direction
== EXEC_FORWARD
&& record_list
->next
)
1196 record_list
= record_list
->next
;
1198 /* Loop over the record_list, looking for the next place to
1202 /* Check for beginning and end of log. */
1203 if (execution_direction
== EXEC_REVERSE
1204 && record_list
== &record_first
)
1206 /* Hit beginning of record log in reverse. */
1207 status
->kind
= TARGET_WAITKIND_NO_HISTORY
;
1210 if (execution_direction
!= EXEC_REVERSE
&& !record_list
->next
)
1212 /* Hit end of record log going forward. */
1213 status
->kind
= TARGET_WAITKIND_NO_HISTORY
;
1217 record_exec_insn (regcache
, gdbarch
, record_list
);
1219 if (record_list
->type
== record_end
)
1221 if (record_debug
> 1)
1222 fprintf_unfiltered (gdb_stdlog
,
1223 "Process record: record_end %s to "
1225 host_address_to_string (record_list
));
1227 if (first_record_end
&& execution_direction
== EXEC_REVERSE
)
1229 /* When reverse excute, the first record_end is the part of
1230 current instruction. */
1231 first_record_end
= 0;
1235 /* In EXEC_REVERSE mode, this is the record_end of prev
1237 In EXEC_FORWARD mode, this is the record_end of current
1240 if (record_resume_step
)
1242 if (record_debug
> 1)
1243 fprintf_unfiltered (gdb_stdlog
,
1244 "Process record: step.\n");
1248 /* check breakpoint */
1249 tmp_pc
= regcache_read_pc (regcache
);
1250 if (breakpoint_inserted_here_p (aspace
, tmp_pc
))
1252 int decr_pc_after_break
1253 = gdbarch_decr_pc_after_break (gdbarch
);
1256 fprintf_unfiltered (gdb_stdlog
,
1257 "Process record: break "
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
,
1265 regcache_write_pc (regcache
,
1266 tmp_pc
+ decr_pc_after_break
);
1270 if (record_hw_watchpoint
)
1273 fprintf_unfiltered (gdb_stdlog
, "\
1274 Process record: hit hw watchpoint.\n");
1277 /* Check target signal */
1278 if (record_list
->u
.end
.sigval
!= TARGET_SIGNAL_0
)
1279 /* FIXME: better way to check */
1286 if (execution_direction
== EXEC_REVERSE
)
1288 if (record_list
->prev
)
1289 record_list
= record_list
->prev
;
1293 if (record_list
->next
)
1294 record_list
= record_list
->next
;
1298 while (continue_flag
);
1300 signal (SIGINT
, handle_sigint
);
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
;
1309 status
->value
.sig
= TARGET_SIGNAL_TRAP
;
1311 discard_cleanups (old_cleanups
);
1314 do_cleanups (set_cleanups
);
1315 return inferior_ptid
;
1319 record_stopped_by_watchpoint (void)
1321 if (RECORD_IS_REPLAY
)
1322 return record_hw_watchpoint
;
1324 return record_beneath_to_stopped_by_watchpoint ();
1328 record_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
1330 if (RECORD_IS_REPLAY
)
1333 return record_beneath_to_stopped_data_address (ops
, addr_p
);
1336 /* "to_disconnect" method for process record target. */
1339 record_disconnect (struct target_ops
*target
, char *args
, int from_tty
)
1342 fprintf_unfiltered (gdb_stdlog
, "Process record: record_disconnect\n");
1344 unpush_target (&record_ops
);
1345 target_disconnect (args
, from_tty
);
1348 /* "to_detach" method for process record target. */
1351 record_detach (struct target_ops
*ops
, char *args
, int from_tty
)
1354 fprintf_unfiltered (gdb_stdlog
, "Process record: record_detach\n");
1356 unpush_target (&record_ops
);
1357 target_detach (args
, from_tty
);
1360 /* "to_mourn_inferior" method for process record target. */
1363 record_mourn_inferior (struct target_ops
*ops
)
1366 fprintf_unfiltered (gdb_stdlog
, "Process record: "
1367 "record_mourn_inferior\n");
1369 unpush_target (&record_ops
);
1370 target_mourn_inferior ();
1373 /* Close process record target before killing the inferior process. */
1376 record_kill (struct target_ops
*ops
)
1379 fprintf_unfiltered (gdb_stdlog
, "Process record: record_kill\n");
1381 unpush_target (&record_ops
);
1385 /* Record registers change (by user or by GDB) to list as an instruction. */
1388 record_registers_change (struct regcache
*regcache
, int regnum
)
1390 /* Check record_insn_num. */
1391 record_check_insn_num (0);
1393 record_arch_list_head
= NULL
;
1394 record_arch_list_tail
= NULL
;
1399 for (i
= 0; i
< gdbarch_num_regs (get_regcache_arch (regcache
)); i
++)
1401 if (record_arch_list_add_reg (regcache
, i
))
1403 record_list_release (record_arch_list_tail
);
1404 error (_("Process record: failed to record execution log."));
1410 if (record_arch_list_add_reg (regcache
, regnum
))
1412 record_list_release (record_arch_list_tail
);
1413 error (_("Process record: failed to record execution log."));
1416 if (record_arch_list_add_end ())
1418 record_list_release (record_arch_list_tail
);
1419 error (_("Process record: failed to record execution log."));
1421 record_list
->next
= record_arch_list_head
;
1422 record_arch_list_head
->prev
= record_list
;
1423 record_list
= record_arch_list_tail
;
1425 if (record_insn_num
== record_insn_max_num
&& record_insn_max_num
)
1426 record_list_release_first ();
1431 /* "to_store_registers" method for process record target. */
1434 record_store_registers (struct target_ops
*ops
, struct regcache
*regcache
,
1437 if (!record_gdb_operation_disable
)
1439 if (RECORD_IS_REPLAY
)
1443 /* Let user choose if he wants to write register or not. */
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?"));
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
),
1460 /* Invalidate the value of regcache that was set in function
1461 "regcache_raw_write". */
1466 i
< gdbarch_num_regs (get_regcache_arch (regcache
));
1468 regcache_invalidate (regcache
, i
);
1471 regcache_invalidate (regcache
, regno
);
1473 error (_("Process record canceled the operation."));
1476 /* Destroy the record from here forward. */
1477 record_list_release_following (record_list
);
1480 record_registers_change (regcache
, regno
);
1482 record_beneath_to_store_registers (record_beneath_to_store_registers_ops
,
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. */
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
)
1495 if (!record_gdb_operation_disable
1496 && (object
== TARGET_OBJECT_MEMORY
1497 || object
== TARGET_OBJECT_RAW_MEMORY
) && writebuf
)
1499 if (RECORD_IS_REPLAY
)
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."));
1508 /* Destroy the record from here forward. */
1509 record_list_release_following (record_list
);
1512 /* Check record_insn_num */
1513 record_check_insn_num (0);
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
))
1520 record_list_release (record_arch_list_tail
);
1522 fprintf_unfiltered (gdb_stdlog
,
1523 "Process record: failed to record "
1527 if (record_arch_list_add_end ())
1529 record_list_release (record_arch_list_tail
);
1531 fprintf_unfiltered (gdb_stdlog
,
1532 "Process record: failed to record "
1536 record_list
->next
= record_arch_list_head
;
1537 record_arch_list_head
->prev
= record_list
;
1538 record_list
= record_arch_list_tail
;
1540 if (record_insn_num
== record_insn_max_num
&& record_insn_max_num
)
1541 record_list_release_first ();
1546 return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops
,
1547 object
, annex
, readbuf
, writebuf
,
1551 /* Behavior is conditional on RECORD_IS_REPLAY.
1552 We will not actually insert or remove breakpoints when replaying,
1553 nor when recording. */
1556 record_insert_breakpoint (struct gdbarch
*gdbarch
,
1557 struct bp_target_info
*bp_tgt
)
1559 if (!RECORD_IS_REPLAY
)
1561 struct cleanup
*old_cleanups
= record_gdb_operation_disable_set ();
1562 int ret
= record_beneath_to_insert_breakpoint (gdbarch
, bp_tgt
);
1564 do_cleanups (old_cleanups
);
1572 /* "to_remove_breakpoint" method for process record target. */
1575 record_remove_breakpoint (struct gdbarch
*gdbarch
,
1576 struct bp_target_info
*bp_tgt
)
1578 if (!RECORD_IS_REPLAY
)
1580 struct cleanup
*old_cleanups
= record_gdb_operation_disable_set ();
1581 int ret
= record_beneath_to_remove_breakpoint (gdbarch
, bp_tgt
);
1583 do_cleanups (old_cleanups
);
1591 /* "to_can_execute_reverse" method for process record target. */
1594 record_can_execute_reverse (void)
1599 /* "to_get_bookmark" method for process record and prec over core. */
1602 record_get_bookmark (char *args
, int from_tty
)
1604 gdb_byte
*ret
= NULL
;
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
));
1613 fprintf_unfiltered (gdb_stdlog
,
1614 "record_get_bookmark returns %s\n", ret
);
1616 fprintf_unfiltered (gdb_stdlog
,
1617 "record_get_bookmark returns NULL\n");
1622 /* The implementation of the command "record goto". */
1623 static void cmd_record_goto (char *, int);
1625 /* "to_goto_bookmark" method for process record and prec over core. */
1628 record_goto_bookmark (gdb_byte
*bookmark
, int from_tty
)
1631 fprintf_unfiltered (gdb_stdlog
,
1632 "record_goto_bookmark receives %s\n", bookmark
);
1634 if (bookmark
[0] == '\'' || bookmark
[0] == '\"')
1636 if (bookmark
[strlen (bookmark
) - 1] != bookmark
[0])
1637 error (_("Unbalanced quotes: %s"), bookmark
);
1639 /* Strip trailing quote. */
1640 bookmark
[strlen (bookmark
) - 1] = '\0';
1641 /* Strip leading quote. */
1643 /* Pass along to cmd_record_goto. */
1646 cmd_record_goto ((char *) bookmark
, from_tty
);
1651 init_record_ops (void)
1653 record_ops
.to_shortname
= "record";
1654 record_ops
.to_longname
= "Process record and replay target";
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_stopped_data_address
= record_stopped_data_address
;
1672 record_ops
.to_can_execute_reverse
= record_can_execute_reverse
;
1673 record_ops
.to_stratum
= record_stratum
;
1674 /* Add bookmark target methods. */
1675 record_ops
.to_get_bookmark
= record_get_bookmark
;
1676 record_ops
.to_goto_bookmark
= record_goto_bookmark
;
1677 record_ops
.to_magic
= OPS_MAGIC
;
1680 /* "to_resume" method for prec over corefile. */
1683 record_core_resume (struct target_ops
*ops
, ptid_t ptid
, int step
,
1684 enum target_signal signal
)
1686 record_resume_step
= step
;
1689 /* "to_kill" method for prec over corefile. */
1692 record_core_kill (struct target_ops
*ops
)
1695 fprintf_unfiltered (gdb_stdlog
, "Process record: record_core_kill\n");
1697 unpush_target (&record_core_ops
);
1700 /* "to_fetch_registers" method for prec over corefile. */
1703 record_core_fetch_registers (struct target_ops
*ops
,
1704 struct regcache
*regcache
,
1709 int num
= gdbarch_num_regs (get_regcache_arch (regcache
));
1712 for (i
= 0; i
< num
; i
++)
1713 regcache_raw_supply (regcache
, i
,
1714 record_core_regbuf
+ MAX_REGISTER_SIZE
* i
);
1717 regcache_raw_supply (regcache
, regno
,
1718 record_core_regbuf
+ MAX_REGISTER_SIZE
* regno
);
1721 /* "to_prepare_to_store" method for prec over corefile. */
1724 record_core_prepare_to_store (struct regcache
*regcache
)
1728 /* "to_store_registers" method for prec over corefile. */
1731 record_core_store_registers (struct target_ops
*ops
,
1732 struct regcache
*regcache
,
1735 if (record_gdb_operation_disable
)
1736 regcache_raw_collect (regcache
, regno
,
1737 record_core_regbuf
+ MAX_REGISTER_SIZE
* regno
);
1739 error (_("You can't do that without a process to debug."));
1742 /* "to_xfer_partial" method for prec over corefile. */
1745 record_core_xfer_partial (struct target_ops
*ops
, enum target_object object
,
1746 const char *annex
, gdb_byte
*readbuf
,
1747 const gdb_byte
*writebuf
, ULONGEST offset
,
1750 if (object
== TARGET_OBJECT_MEMORY
)
1752 if (record_gdb_operation_disable
|| !writebuf
)
1754 struct target_section
*p
;
1755 for (p
= record_core_start
; p
< record_core_end
; p
++)
1757 if (offset
>= p
->addr
)
1759 struct record_core_buf_entry
*entry
;
1760 ULONGEST sec_offset
;
1762 if (offset
>= p
->endaddr
)
1765 if (offset
+ len
> p
->endaddr
)
1766 len
= p
->endaddr
- offset
;
1768 sec_offset
= offset
- p
->addr
;
1770 /* Read readbuf or write writebuf p, offset, len. */
1772 if (p
->the_bfd_section
->flags
& SEC_CONSTRUCTOR
1773 || (p
->the_bfd_section
->flags
& SEC_HAS_CONTENTS
) == 0)
1776 memset (readbuf
, 0, len
);
1779 /* Get record_core_buf_entry. */
1780 for (entry
= record_core_buf_list
; entry
;
1781 entry
= entry
->prev
)
1788 /* Add a new entry. */
1790 = (struct record_core_buf_entry
*)
1792 (sizeof (struct record_core_buf_entry
));
1794 if (!bfd_malloc_and_get_section (p
->bfd
,
1801 entry
->prev
= record_core_buf_list
;
1802 record_core_buf_list
= entry
;
1805 memcpy (entry
->buf
+ sec_offset
, writebuf
,
1811 return record_beneath_to_xfer_partial
1812 (record_beneath_to_xfer_partial_ops
,
1813 object
, annex
, readbuf
, writebuf
,
1816 memcpy (readbuf
, entry
->buf
+ sec_offset
,
1827 error (_("You can't do that without a process to debug."));
1830 return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops
,
1831 object
, annex
, readbuf
, writebuf
,
1835 /* "to_insert_breakpoint" method for prec over corefile. */
1838 record_core_insert_breakpoint (struct gdbarch
*gdbarch
,
1839 struct bp_target_info
*bp_tgt
)
1844 /* "to_remove_breakpoint" method for prec over corefile. */
1847 record_core_remove_breakpoint (struct gdbarch
*gdbarch
,
1848 struct bp_target_info
*bp_tgt
)
1853 /* "to_has_execution" method for prec over corefile. */
1856 record_core_has_execution (struct target_ops
*ops
)
1862 init_record_core_ops (void)
1864 record_core_ops
.to_shortname
= "record-core";
1865 record_core_ops
.to_longname
= "Process record and replay target";
1866 record_core_ops
.to_doc
=
1867 "Log program while executing and replay execution from log.";
1868 record_core_ops
.to_open
= record_open
;
1869 record_core_ops
.to_close
= record_close
;
1870 record_core_ops
.to_resume
= record_core_resume
;
1871 record_core_ops
.to_wait
= record_wait
;
1872 record_core_ops
.to_kill
= record_core_kill
;
1873 record_core_ops
.to_fetch_registers
= record_core_fetch_registers
;
1874 record_core_ops
.to_prepare_to_store
= record_core_prepare_to_store
;
1875 record_core_ops
.to_store_registers
= record_core_store_registers
;
1876 record_core_ops
.to_xfer_partial
= record_core_xfer_partial
;
1877 record_core_ops
.to_insert_breakpoint
= record_core_insert_breakpoint
;
1878 record_core_ops
.to_remove_breakpoint
= record_core_remove_breakpoint
;
1879 record_core_ops
.to_stopped_by_watchpoint
= record_stopped_by_watchpoint
;
1880 record_core_ops
.to_stopped_data_address
= record_stopped_data_address
;
1881 record_core_ops
.to_can_execute_reverse
= record_can_execute_reverse
;
1882 record_core_ops
.to_has_execution
= record_core_has_execution
;
1883 record_core_ops
.to_stratum
= record_stratum
;
1884 /* Add bookmark target methods. */
1885 record_core_ops
.to_get_bookmark
= record_get_bookmark
;
1886 record_core_ops
.to_goto_bookmark
= record_goto_bookmark
;
1887 record_core_ops
.to_magic
= OPS_MAGIC
;
1890 /* Implement "show record debug" command. */
1893 show_record_debug (struct ui_file
*file
, int from_tty
,
1894 struct cmd_list_element
*c
, const char *value
)
1896 fprintf_filtered (file
, _("Debugging of process record target is %s.\n"),
1900 /* Alias for "target record". */
1903 cmd_record_start (char *args
, int from_tty
)
1905 execute_command ("target record", from_tty
);
1908 /* Truncate the record log from the present point
1909 of replay until the end. */
1912 cmd_record_delete (char *args
, int from_tty
)
1914 if (current_target
.to_stratum
== record_stratum
)
1916 if (RECORD_IS_REPLAY
)
1918 if (!from_tty
|| query (_("Delete the log from this point forward "
1919 "and begin to record the running message "
1921 record_list_release_following (record_list
);
1924 printf_unfiltered (_("Already at end of record list.\n"));
1928 printf_unfiltered (_("Process record is not started.\n"));
1931 /* Implement the "stoprecord" or "record stop" command. */
1934 cmd_record_stop (char *args
, int from_tty
)
1936 if (current_target
.to_stratum
== record_stratum
)
1938 unpush_target (&record_ops
);
1939 printf_unfiltered (_("Process record is stopped and all execution "
1940 "logs are deleted.\n"));
1943 printf_unfiltered (_("Process record is not started.\n"));
1946 /* Set upper limit of record log size. */
1949 set_record_insn_max_num (char *args
, int from_tty
, struct cmd_list_element
*c
)
1951 if (record_insn_num
> record_insn_max_num
&& record_insn_max_num
)
1953 /* Count down record_insn_num while releasing records from list. */
1954 while (record_insn_num
> record_insn_max_num
)
1956 record_list_release_first ();
1962 static struct cmd_list_element
*record_cmdlist
, *set_record_cmdlist
,
1963 *show_record_cmdlist
, *info_record_cmdlist
;
1966 set_record_command (char *args
, int from_tty
)
1968 printf_unfiltered (_("\
1969 \"set record\" must be followed by an apporpriate subcommand.\n"));
1970 help_list (set_record_cmdlist
, "set record ", all_commands
, gdb_stdout
);
1974 show_record_command (char *args
, int from_tty
)
1976 cmd_show_list (show_record_cmdlist
, from_tty
, "");
1979 /* Display some statistics about the execution log. */
1982 info_record_command (char *args
, int from_tty
)
1984 struct record_entry
*p
;
1986 if (current_target
.to_stratum
== record_stratum
)
1988 if (RECORD_IS_REPLAY
)
1989 printf_filtered (_("Replay mode:\n"));
1991 printf_filtered (_("Record mode:\n"));
1993 /* Find entry for first actual instruction in the log. */
1994 for (p
= record_first
.next
;
1995 p
!= NULL
&& p
->type
!= record_end
;
1999 /* Do we have a log at all? */
2000 if (p
!= NULL
&& p
->type
== record_end
)
2002 /* Display instruction number for first instruction in the log. */
2003 printf_filtered (_("Lowest recorded instruction number is %s.\n"),
2004 pulongest (p
->u
.end
.insn_num
));
2006 /* If in replay mode, display where we are in the log. */
2007 if (RECORD_IS_REPLAY
)
2008 printf_filtered (_("Current instruction number is %s.\n"),
2009 pulongest (record_list
->u
.end
.insn_num
));
2011 /* Display instruction number for last instruction in the log. */
2012 printf_filtered (_("Highest recorded instruction number is %s.\n"),
2013 pulongest (record_insn_count
));
2015 /* Display log count. */
2016 printf_filtered (_("Log contains %d instructions.\n"),
2021 printf_filtered (_("No instructions have been logged.\n"));
2026 printf_filtered (_("target record is not active.\n"));
2029 /* Display max log size. */
2030 printf_filtered (_("Max logged instructions is %d.\n"),
2031 record_insn_max_num
);
2034 /* Record log save-file format
2035 Version 1 (never released)
2038 4 bytes: magic number htonl(0x20090829).
2039 NOTE: be sure to change whenever this file format changes!
2043 1 byte: record type (record_end, see enum record_type).
2045 1 byte: record type (record_reg, see enum record_type).
2046 8 bytes: register id (network byte order).
2047 MAX_REGISTER_SIZE bytes: register value.
2049 1 byte: record type (record_mem, see enum record_type).
2050 8 bytes: memory length (network byte order).
2051 8 bytes: memory address (network byte order).
2052 n bytes: memory value (n == memory length).
2055 4 bytes: magic number netorder32(0x20091016).
2056 NOTE: be sure to change whenever this file format changes!
2060 1 byte: record type (record_end, see enum record_type).
2062 4 bytes: instruction count
2064 1 byte: record type (record_reg, see enum record_type).
2065 4 bytes: register id (network byte order).
2066 n bytes: register value (n == actual register size).
2067 (eg. 4 bytes for x86 general registers).
2069 1 byte: record type (record_mem, see enum record_type).
2070 4 bytes: memory length (network byte order).
2071 8 bytes: memory address (network byte order).
2072 n bytes: memory value (n == memory length).
2076 /* bfdcore_read -- read bytes from a core file section. */
2079 bfdcore_read (bfd
*obfd
, asection
*osec
, void *buf
, int len
, int *offset
)
2081 int ret
= bfd_get_section_contents (obfd
, osec
, buf
, *offset
, len
);
2086 error (_("Failed to read %d bytes from core file %s ('%s').\n"),
2087 len
, bfd_get_filename (obfd
),
2088 bfd_errmsg (bfd_get_error ()));
2091 static inline uint64_t
2092 netorder64 (uint64_t input
)
2096 store_unsigned_integer ((gdb_byte
*) &ret
, sizeof (ret
),
2097 BFD_ENDIAN_BIG
, input
);
2101 static inline uint32_t
2102 netorder32 (uint32_t input
)
2106 store_unsigned_integer ((gdb_byte
*) &ret
, sizeof (ret
),
2107 BFD_ENDIAN_BIG
, input
);
2111 static inline uint16_t
2112 netorder16 (uint16_t input
)
2116 store_unsigned_integer ((gdb_byte
*) &ret
, sizeof (ret
),
2117 BFD_ENDIAN_BIG
, input
);
2121 /* Restore the execution log from a core_bfd file. */
2123 record_restore (void)
2126 struct cleanup
*old_cleanups
;
2127 struct record_entry
*rec
;
2131 struct regcache
*regcache
;
2133 /* We restore the execution log from the open core bfd,
2135 if (core_bfd
== NULL
)
2138 /* "record_restore" can only be called when record list is empty. */
2139 gdb_assert (record_first
.next
== NULL
);
2142 fprintf_unfiltered (gdb_stdlog
, "Restoring recording from core file.\n");
2144 /* Now need to find our special note section. */
2145 osec
= bfd_get_section_by_name (core_bfd
, "null0");
2146 osec_size
= bfd_section_size (core_bfd
, osec
);
2148 fprintf_unfiltered (gdb_stdlog
, "Find precord section %s.\n",
2149 osec
? "succeeded" : "failed");
2153 fprintf_unfiltered (gdb_stdlog
, "%s", bfd_section_name (core_bfd
, osec
));
2155 /* Check the magic code. */
2156 bfdcore_read (core_bfd
, osec
, &magic
, sizeof (magic
), &bfd_offset
);
2157 if (magic
!= RECORD_FILE_MAGIC
)
2158 error (_("Version mis-match or file format error in core file %s."),
2159 bfd_get_filename (core_bfd
));
2161 fprintf_unfiltered (gdb_stdlog
, "\
2162 Reading 4-byte magic cookie RECORD_FILE_MAGIC (0x%s)\n",
2163 phex_nz (netorder32 (magic
), 4));
2165 /* Restore the entries in recfd into record_arch_list_head and
2166 record_arch_list_tail. */
2167 record_arch_list_head
= NULL
;
2168 record_arch_list_tail
= NULL
;
2169 record_insn_num
= 0;
2170 old_cleanups
= make_cleanup (record_arch_list_cleanups
, 0);
2171 regcache
= get_current_regcache ();
2176 uint32_t regnum
, len
, signal
, count
;
2179 /* We are finished when offset reaches osec_size. */
2180 if (bfd_offset
>= osec_size
)
2182 bfdcore_read (core_bfd
, osec
, &rectype
, sizeof (rectype
), &bfd_offset
);
2186 case record_reg
: /* reg */
2187 /* Get register number to regnum. */
2188 bfdcore_read (core_bfd
, osec
, ®num
,
2189 sizeof (regnum
), &bfd_offset
);
2190 regnum
= netorder32 (regnum
);
2192 rec
= record_reg_alloc (regcache
, regnum
);
2195 bfdcore_read (core_bfd
, osec
, record_get_loc (rec
),
2196 rec
->u
.reg
.len
, &bfd_offset
);
2199 fprintf_unfiltered (gdb_stdlog
, "\
2200 Reading register %d (1 plus %lu plus %d bytes)\n",
2202 (unsigned long) sizeof (regnum
),
2206 case record_mem
: /* mem */
2208 bfdcore_read (core_bfd
, osec
, &len
,
2209 sizeof (len
), &bfd_offset
);
2210 len
= netorder32 (len
);
2213 bfdcore_read (core_bfd
, osec
, &addr
,
2214 sizeof (addr
), &bfd_offset
);
2215 addr
= netorder64 (addr
);
2217 rec
= record_mem_alloc (addr
, len
);
2220 bfdcore_read (core_bfd
, osec
, record_get_loc (rec
),
2221 rec
->u
.mem
.len
, &bfd_offset
);
2224 fprintf_unfiltered (gdb_stdlog
, "\
2225 Reading memory %s (1 plus %lu plus %lu plus %d bytes)\n",
2226 paddress (get_current_arch (),
2228 (unsigned long) sizeof (addr
),
2229 (unsigned long) sizeof (len
),
2233 case record_end
: /* end */
2234 rec
= record_end_alloc ();
2237 /* Get signal value. */
2238 bfdcore_read (core_bfd
, osec
, &signal
,
2239 sizeof (signal
), &bfd_offset
);
2240 signal
= netorder32 (signal
);
2241 rec
->u
.end
.sigval
= signal
;
2243 /* Get insn count. */
2244 bfdcore_read (core_bfd
, osec
, &count
,
2245 sizeof (count
), &bfd_offset
);
2246 count
= netorder32 (count
);
2247 rec
->u
.end
.insn_num
= count
;
2248 record_insn_count
= count
+ 1;
2250 fprintf_unfiltered (gdb_stdlog
, "\
2251 Reading record_end (1 + %lu + %lu bytes), offset == %s\n",
2252 (unsigned long) sizeof (signal
),
2253 (unsigned long) sizeof (count
),
2254 paddress (get_current_arch (),
2259 error (_("Bad entry type in core file %s."),
2260 bfd_get_filename (core_bfd
));
2264 /* Add rec to record arch list. */
2265 record_arch_list_add (rec
);
2268 discard_cleanups (old_cleanups
);
2270 /* Add record_arch_list_head to the end of record list. */
2271 record_first
.next
= record_arch_list_head
;
2272 record_arch_list_head
->prev
= &record_first
;
2273 record_arch_list_tail
->next
= NULL
;
2274 record_list
= &record_first
;
2276 /* Update record_insn_max_num. */
2277 if (record_insn_num
> record_insn_max_num
)
2279 record_insn_max_num
= record_insn_num
;
2280 warning (_("Auto increase record/replay buffer limit to %d."),
2281 record_insn_max_num
);
2285 printf_filtered (_("Restored records from core file %s.\n"),
2286 bfd_get_filename (core_bfd
));
2288 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
2291 /* bfdcore_write -- write bytes into a core file section. */
2294 bfdcore_write (bfd
*obfd
, asection
*osec
, void *buf
, int len
, int *offset
)
2296 int ret
= bfd_set_section_contents (obfd
, osec
, buf
, *offset
, len
);
2301 error (_("Failed to write %d bytes to core file %s ('%s').\n"),
2302 len
, bfd_get_filename (obfd
),
2303 bfd_errmsg (bfd_get_error ()));
2306 /* Restore the execution log from a file. We use a modified elf
2307 corefile format, with an extra section for our data. */
2310 cmd_record_restore (char *args
, int from_tty
)
2312 core_file_command (args
, from_tty
);
2313 record_open (args
, from_tty
);
2317 record_save_cleanups (void *data
)
2320 char *pathname
= xstrdup (bfd_get_filename (obfd
));
2326 /* Save the execution log to a file. We use a modified elf corefile
2327 format, with an extra section for our data. */
2330 cmd_record_save (char *args
, int from_tty
)
2332 char *recfilename
, recfilename_buffer
[40];
2333 struct record_entry
*cur_record_list
;
2335 struct regcache
*regcache
;
2336 struct gdbarch
*gdbarch
;
2337 struct cleanup
*old_cleanups
;
2338 struct cleanup
*set_cleanups
;
2341 asection
*osec
= NULL
;
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"));
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
;
2358 /* Open the save file. */
2360 fprintf_unfiltered (gdb_stdlog
, "Saving execution log to core file '%s'\n",
2363 /* Open the output file. */
2364 obfd
= create_gcore_bfd (recfilename
);
2365 old_cleanups
= make_cleanup (record_save_cleanups
, obfd
);
2367 /* Save the current record entry to "cur_record_list". */
2368 cur_record_list
= record_list
;
2370 /* Get the values of regcache and gdbarch. */
2371 regcache
= get_current_regcache ();
2372 gdbarch
= get_regcache_arch (regcache
);
2374 /* Disable the GDB operation record. */
2375 set_cleanups
= record_gdb_operation_disable_set ();
2377 /* Reverse execute to the begin of record list. */
2380 /* Check for beginning and end of log. */
2381 if (record_list
== &record_first
)
2384 record_exec_insn (regcache
, gdbarch
, record_list
);
2386 if (record_list
->prev
)
2387 record_list
= record_list
->prev
;
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
)
2397 save_size
+= 1 + 4 + 4;
2400 save_size
+= 1 + 4 + record_list
->u
.reg
.len
;
2403 save_size
+= 1 + 4 + 8 + record_list
->u
.mem
.len
;
2407 /* Make the new bfd section. */
2408 osec
= bfd_make_section_anyway_with_flags (obfd
, "precord",
2412 error (_("Failed to create 'precord' section for corefile %s: %s"),
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;
2420 /* Save corefile state. */
2421 write_gcore_file (obfd
);
2423 /* Write out the record log. */
2424 /* Write the magic code. */
2425 magic
= RECORD_FILE_MAGIC
;
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
);
2432 /* Save the entries to recfd and forward execute to the end of
2434 record_list
= &record_first
;
2438 if (record_list
!= &record_first
)
2441 uint32_t regnum
, len
, signal
, count
;
2444 type
= record_list
->type
;
2445 bfdcore_write (obfd
, osec
, &type
, sizeof (type
), &bfd_offset
);
2447 switch (record_list
->type
)
2449 case record_reg
: /* reg */
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
);
2458 regnum
= netorder32 (record_list
->u
.reg
.num
);
2459 bfdcore_write (obfd
, osec
, ®num
,
2460 sizeof (regnum
), &bfd_offset
);
2463 bfdcore_write (obfd
, osec
, record_get_loc (record_list
),
2464 record_list
->u
.reg
.len
, &bfd_offset
);
2467 case record_mem
: /* mem */
2469 fprintf_unfiltered (gdb_stdlog
, "\
2470 Writing memory %s (1 plus %lu plus %lu plus %d bytes)\n",
2472 record_list
->u
.mem
.addr
),
2473 (unsigned long) sizeof (addr
),
2474 (unsigned long) sizeof (len
),
2475 record_list
->u
.mem
.len
);
2478 len
= netorder32 (record_list
->u
.mem
.len
);
2479 bfdcore_write (obfd
, osec
, &len
, sizeof (len
), &bfd_offset
);
2481 /* Write memaddr. */
2482 addr
= netorder64 (record_list
->u
.mem
.addr
);
2483 bfdcore_write (obfd
, osec
, &addr
,
2484 sizeof (addr
), &bfd_offset
);
2487 bfdcore_write (obfd
, osec
, record_get_loc (record_list
),
2488 record_list
->u
.mem
.len
, &bfd_offset
);
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
);
2502 /* Write insn count. */
2503 count
= netorder32 (record_list
->u
.end
.insn_num
);
2504 bfdcore_write (obfd
, osec
, &count
,
2505 sizeof (count
), &bfd_offset
);
2510 /* Execute entry. */
2511 record_exec_insn (regcache
, gdbarch
, record_list
);
2513 if (record_list
->next
)
2514 record_list
= record_list
->next
;
2519 /* Reverse execute to cur_record_list. */
2522 /* Check for beginning and end of log. */
2523 if (record_list
== cur_record_list
)
2526 record_exec_insn (regcache
, gdbarch
, record_list
);
2528 if (record_list
->prev
)
2529 record_list
= record_list
->prev
;
2532 do_cleanups (set_cleanups
);
2534 discard_cleanups (old_cleanups
);
2537 printf_filtered (_("Saved core file %s with execution log.\n"),
2541 /* record_goto_insn -- rewind the record log (forward or backward,
2542 depending on DIR) to the given entry, changing the program state
2546 record_goto_insn (struct record_entry
*entry
,
2547 enum exec_direction_kind dir
)
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
);
2553 /* Assume everything is valid: we will hit the entry,
2554 and we will not hit the end of the recording. */
2556 if (dir
== EXEC_FORWARD
)
2557 record_list
= record_list
->next
;
2561 record_exec_insn (regcache
, gdbarch
, record_list
);
2562 if (dir
== EXEC_REVERSE
)
2563 record_list
= record_list
->prev
;
2565 record_list
= record_list
->next
;
2566 } while (record_list
!= entry
);
2567 do_cleanups (set_cleanups
);
2570 /* "record goto" command. Argument is an instruction number,
2571 as given by "info record".
2573 Rewinds the recording (forward or backward) to the given instruction. */
2576 cmd_record_goto (char *arg
, int from_tty
)
2578 struct record_entry
*p
= NULL
;
2579 ULONGEST target_insn
= 0;
2581 if (arg
== NULL
|| *arg
== '\0')
2582 error (_("Command requires an argument (insn number to go to)."));
2584 if (strncmp (arg
, "start", strlen ("start")) == 0
2585 || strncmp (arg
, "begin", strlen ("begin")) == 0)
2587 /* Special case. Find first insn. */
2588 for (p
= &record_first
; p
!= NULL
; p
= p
->next
)
2589 if (p
->type
== record_end
)
2592 target_insn
= p
->u
.end
.insn_num
;
2594 else if (strncmp (arg
, "end", strlen ("end")) == 0)
2596 /* Special case. Find last insn. */
2597 for (p
= record_list
; p
->next
!= NULL
; p
= p
->next
)
2599 for (; p
!= NULL
; p
= p
->prev
)
2600 if (p
->type
== record_end
)
2603 target_insn
= p
->u
.end
.insn_num
;
2607 /* General case. Find designated insn. */
2608 target_insn
= parse_and_eval_long (arg
);
2610 for (p
= &record_first
; p
!= NULL
; p
= p
->next
)
2611 if (p
->type
== record_end
&& p
->u
.end
.insn_num
== target_insn
)
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
)
2621 printf_filtered (_("Go forward to insn number %s\n"),
2622 pulongest (target_insn
));
2623 record_goto_insn (p
, EXEC_FORWARD
);
2627 printf_filtered (_("Go backward to insn number %s\n"),
2628 pulongest (target_insn
));
2629 record_goto_insn (p
, EXEC_REVERSE
);
2631 registers_changed ();
2632 reinit_frame_cache ();
2633 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
2637 _initialize_record (void)
2639 struct cmd_list_element
*c
;
2641 /* Init record_first. */
2642 record_first
.prev
= NULL
;
2643 record_first
.next
= NULL
;
2644 record_first
.type
= record_end
;
2647 add_target (&record_ops
);
2648 init_record_core_ops ();
2649 add_target (&record_core_ops
);
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
,
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
);
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
);
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>'."),
2683 set_cmd_completer (c
, filename_completer
);
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'."),
2689 set_cmd_completer (c
, filename_completer
);
2691 add_cmd ("delete", class_obscure
, cmd_record_delete
,
2692 _("Delete the rest of execution log and start recording it anew."),
2694 add_alias_cmd ("d", "delete", class_obscure
, 1, &record_cmdlist
);
2695 add_alias_cmd ("del", "delete", class_obscure
, 1, &record_cmdlist
);
2697 add_cmd ("stop", class_obscure
, cmd_record_stop
,
2698 _("Stop the record/replay target."),
2700 add_alias_cmd ("s", "stop", class_obscure
, 1, &record_cmdlist
);
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."), _("\
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."),
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
);
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'."),