1 /* Process record and replay target for GDB, the GNU debugger.
3 Copyright (C) 2013-2018 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 "completer.h"
26 #include "arch-utils.h"
30 #include "record-full.h"
33 #include "event-loop.h"
36 #include "observable.h"
38 #include "common/gdb_unlinker.h"
39 #include "common/byte-vector.h"
43 /* This module implements "target record-full", also known as "process
44 record and replay". This target sits on top of a "normal" target
45 (a target that "has execution"), and provides a record and replay
46 functionality, including reverse debugging.
48 Target record has two modes: recording, and replaying.
50 In record mode, we intercept the to_resume and to_wait methods.
51 Whenever gdb resumes the target, we run the target in single step
52 mode, and we build up an execution log in which, for each executed
53 instruction, we record all changes in memory and register state.
54 This is invisible to the user, to whom it just looks like an
55 ordinary debugging session (except for performance degredation).
57 In replay mode, instead of actually letting the inferior run as a
58 process, we simulate its execution by playing back the recorded
59 execution log. For each instruction in the log, we simulate the
60 instruction's side effects by duplicating the changes that it would
61 have made on memory and registers. */
63 #define DEFAULT_RECORD_FULL_INSN_MAX_NUM 200000
65 #define RECORD_FULL_IS_REPLAY \
66 (record_full_list->next || execution_direction == EXEC_REVERSE)
68 #define RECORD_FULL_FILE_MAGIC netorder32(0x20091016)
70 /* These are the core structs of the process record functionality.
72 A record_full_entry is a record of the value change of a register
73 ("record_full_reg") or a part of memory ("record_full_mem"). And each
74 instruction must have a struct record_full_entry ("record_full_end")
75 that indicates that this is the last struct record_full_entry of this
78 Each struct record_full_entry is linked to "record_full_list" by "prev"
79 and "next" pointers. */
81 struct record_full_mem_entry
85 /* Set this flag if target memory for this entry
86 can no longer be accessed. */
87 int mem_entry_not_accessible
;
91 gdb_byte buf
[sizeof (gdb_byte
*)];
95 struct record_full_reg_entry
102 gdb_byte buf
[2 * sizeof (gdb_byte
*)];
106 struct record_full_end_entry
108 enum gdb_signal sigval
;
112 enum record_full_type
119 /* This is the data structure that makes up the execution log.
121 The execution log consists of a single linked list of entries
122 of type "struct record_full_entry". It is doubly linked so that it
123 can be traversed in either direction.
125 The start of the list is anchored by a struct called
126 "record_full_first". The pointer "record_full_list" either points
127 to the last entry that was added to the list (in record mode), or to
128 the next entry in the list that will be executed (in replay mode).
130 Each list element (struct record_full_entry), in addition to next
131 and prev pointers, consists of a union of three entry types: mem,
132 reg, and end. A field called "type" determines which entry type is
133 represented by a given list element.
135 Each instruction that is added to the execution log is represented
136 by a variable number of list elements ('entries'). The instruction
137 will have one "reg" entry for each register that is changed by
138 executing the instruction (including the PC in every case). It
139 will also have one "mem" entry for each memory change. Finally,
140 each instruction will have an "end" entry that separates it from
141 the changes associated with the next instruction. */
143 struct record_full_entry
145 struct record_full_entry
*prev
;
146 struct record_full_entry
*next
;
147 enum record_full_type type
;
151 struct record_full_reg_entry reg
;
153 struct record_full_mem_entry mem
;
155 struct record_full_end_entry end
;
159 /* If true, query if PREC cannot record memory
160 change of next instruction. */
161 int record_full_memory_query
= 0;
163 struct record_full_core_buf_entry
165 struct record_full_core_buf_entry
*prev
;
166 struct target_section
*p
;
170 /* Record buf with core target. */
171 static detached_regcache
*record_full_core_regbuf
= NULL
;
172 static struct target_section
*record_full_core_start
;
173 static struct target_section
*record_full_core_end
;
174 static struct record_full_core_buf_entry
*record_full_core_buf_list
= NULL
;
176 /* The following variables are used for managing the linked list that
177 represents the execution log.
179 record_full_first is the anchor that holds down the beginning of
182 record_full_list serves two functions:
183 1) In record mode, it anchors the end of the list.
184 2) In replay mode, it traverses the list and points to
185 the next instruction that must be emulated.
187 record_full_arch_list_head and record_full_arch_list_tail are used
188 to manage a separate list, which is used to build up the change
189 elements of the currently executing instruction during record mode.
190 When this instruction has been completely annotated in the "arch
191 list", it will be appended to the main execution log. */
193 static struct record_full_entry record_full_first
;
194 static struct record_full_entry
*record_full_list
= &record_full_first
;
195 static struct record_full_entry
*record_full_arch_list_head
= NULL
;
196 static struct record_full_entry
*record_full_arch_list_tail
= NULL
;
198 /* 1 ask user. 0 auto delete the last struct record_full_entry. */
199 static int record_full_stop_at_limit
= 1;
200 /* Maximum allowed number of insns in execution log. */
201 static unsigned int record_full_insn_max_num
202 = DEFAULT_RECORD_FULL_INSN_MAX_NUM
;
203 /* Actual count of insns presently in execution log. */
204 static unsigned int record_full_insn_num
= 0;
205 /* Count of insns logged so far (may be larger
206 than count of insns presently in execution log). */
207 static ULONGEST record_full_insn_count
;
209 /* The target_ops of process record. */
210 static struct target_ops record_full_ops
;
211 static struct target_ops record_full_core_ops
;
213 /* See record-full.h. */
216 record_full_is_used (void)
218 struct target_ops
*t
;
220 t
= find_record_target ();
221 return (t
== &record_full_ops
222 || t
== &record_full_core_ops
);
226 /* Command lists for "set/show record full". */
227 static struct cmd_list_element
*set_record_full_cmdlist
;
228 static struct cmd_list_element
*show_record_full_cmdlist
;
230 /* Command list for "record full". */
231 static struct cmd_list_element
*record_full_cmdlist
;
233 static void record_full_goto_insn (struct record_full_entry
*entry
,
234 enum exec_direction_kind dir
);
235 static void record_full_save (struct target_ops
*self
,
236 const char *recfilename
);
238 /* Alloc and free functions for record_full_reg, record_full_mem, and
239 record_full_end entries. */
241 /* Alloc a record_full_reg record entry. */
243 static inline struct record_full_entry
*
244 record_full_reg_alloc (struct regcache
*regcache
, int regnum
)
246 struct record_full_entry
*rec
;
247 struct gdbarch
*gdbarch
= regcache
->arch ();
249 rec
= XCNEW (struct record_full_entry
);
250 rec
->type
= record_full_reg
;
251 rec
->u
.reg
.num
= regnum
;
252 rec
->u
.reg
.len
= register_size (gdbarch
, regnum
);
253 if (rec
->u
.reg
.len
> sizeof (rec
->u
.reg
.u
.buf
))
254 rec
->u
.reg
.u
.ptr
= (gdb_byte
*) xmalloc (rec
->u
.reg
.len
);
259 /* Free a record_full_reg record entry. */
262 record_full_reg_release (struct record_full_entry
*rec
)
264 gdb_assert (rec
->type
== record_full_reg
);
265 if (rec
->u
.reg
.len
> sizeof (rec
->u
.reg
.u
.buf
))
266 xfree (rec
->u
.reg
.u
.ptr
);
270 /* Alloc a record_full_mem record entry. */
272 static inline struct record_full_entry
*
273 record_full_mem_alloc (CORE_ADDR addr
, int len
)
275 struct record_full_entry
*rec
;
277 rec
= XCNEW (struct record_full_entry
);
278 rec
->type
= record_full_mem
;
279 rec
->u
.mem
.addr
= addr
;
280 rec
->u
.mem
.len
= len
;
281 if (rec
->u
.mem
.len
> sizeof (rec
->u
.mem
.u
.buf
))
282 rec
->u
.mem
.u
.ptr
= (gdb_byte
*) xmalloc (len
);
287 /* Free a record_full_mem record entry. */
290 record_full_mem_release (struct record_full_entry
*rec
)
292 gdb_assert (rec
->type
== record_full_mem
);
293 if (rec
->u
.mem
.len
> sizeof (rec
->u
.mem
.u
.buf
))
294 xfree (rec
->u
.mem
.u
.ptr
);
298 /* Alloc a record_full_end record entry. */
300 static inline struct record_full_entry
*
301 record_full_end_alloc (void)
303 struct record_full_entry
*rec
;
305 rec
= XCNEW (struct record_full_entry
);
306 rec
->type
= record_full_end
;
311 /* Free a record_full_end record entry. */
314 record_full_end_release (struct record_full_entry
*rec
)
319 /* Free one record entry, any type.
320 Return entry->type, in case caller wants to know. */
322 static inline enum record_full_type
323 record_full_entry_release (struct record_full_entry
*rec
)
325 enum record_full_type type
= rec
->type
;
328 case record_full_reg
:
329 record_full_reg_release (rec
);
331 case record_full_mem
:
332 record_full_mem_release (rec
);
334 case record_full_end
:
335 record_full_end_release (rec
);
341 /* Free all record entries in list pointed to by REC. */
344 record_full_list_release (struct record_full_entry
*rec
)
355 record_full_entry_release (rec
->next
);
358 if (rec
== &record_full_first
)
360 record_full_insn_num
= 0;
361 record_full_first
.next
= NULL
;
364 record_full_entry_release (rec
);
367 /* Free all record entries forward of the given list position. */
370 record_full_list_release_following (struct record_full_entry
*rec
)
372 struct record_full_entry
*tmp
= rec
->next
;
378 if (record_full_entry_release (tmp
) == record_full_end
)
380 record_full_insn_num
--;
381 record_full_insn_count
--;
387 /* Delete the first instruction from the beginning of the log, to make
388 room for adding a new instruction at the end of the log.
390 Note -- this function does not modify record_full_insn_num. */
393 record_full_list_release_first (void)
395 struct record_full_entry
*tmp
;
397 if (!record_full_first
.next
)
400 /* Loop until a record_full_end. */
403 /* Cut record_full_first.next out of the linked list. */
404 tmp
= record_full_first
.next
;
405 record_full_first
.next
= tmp
->next
;
406 tmp
->next
->prev
= &record_full_first
;
408 /* tmp is now isolated, and can be deleted. */
409 if (record_full_entry_release (tmp
) == record_full_end
)
410 break; /* End loop at first record_full_end. */
412 if (!record_full_first
.next
)
414 gdb_assert (record_full_insn_num
== 1);
415 break; /* End loop when list is empty. */
420 /* Add a struct record_full_entry to record_full_arch_list. */
423 record_full_arch_list_add (struct record_full_entry
*rec
)
425 if (record_debug
> 1)
426 fprintf_unfiltered (gdb_stdlog
,
427 "Process record: record_full_arch_list_add %s.\n",
428 host_address_to_string (rec
));
430 if (record_full_arch_list_tail
)
432 record_full_arch_list_tail
->next
= rec
;
433 rec
->prev
= record_full_arch_list_tail
;
434 record_full_arch_list_tail
= rec
;
438 record_full_arch_list_head
= rec
;
439 record_full_arch_list_tail
= rec
;
443 /* Return the value storage location of a record entry. */
444 static inline gdb_byte
*
445 record_full_get_loc (struct record_full_entry
*rec
)
448 case record_full_mem
:
449 if (rec
->u
.mem
.len
> sizeof (rec
->u
.mem
.u
.buf
))
450 return rec
->u
.mem
.u
.ptr
;
452 return rec
->u
.mem
.u
.buf
;
453 case record_full_reg
:
454 if (rec
->u
.reg
.len
> sizeof (rec
->u
.reg
.u
.buf
))
455 return rec
->u
.reg
.u
.ptr
;
457 return rec
->u
.reg
.u
.buf
;
458 case record_full_end
:
460 gdb_assert_not_reached ("unexpected record_full_entry type");
465 /* Record the value of a register NUM to record_full_arch_list. */
468 record_full_arch_list_add_reg (struct regcache
*regcache
, int regnum
)
470 struct record_full_entry
*rec
;
472 if (record_debug
> 1)
473 fprintf_unfiltered (gdb_stdlog
,
474 "Process record: add register num = %d to "
478 rec
= record_full_reg_alloc (regcache
, regnum
);
480 regcache_raw_read (regcache
, regnum
, record_full_get_loc (rec
));
482 record_full_arch_list_add (rec
);
487 /* Record the value of a region of memory whose address is ADDR and
488 length is LEN to record_full_arch_list. */
491 record_full_arch_list_add_mem (CORE_ADDR addr
, int len
)
493 struct record_full_entry
*rec
;
495 if (record_debug
> 1)
496 fprintf_unfiltered (gdb_stdlog
,
497 "Process record: add mem addr = %s len = %d to "
499 paddress (target_gdbarch (), addr
), len
);
501 if (!addr
) /* FIXME: Why? Some arch must permit it... */
504 rec
= record_full_mem_alloc (addr
, len
);
506 if (record_read_memory (target_gdbarch (), addr
,
507 record_full_get_loc (rec
), len
))
509 record_full_mem_release (rec
);
513 record_full_arch_list_add (rec
);
518 /* Add a record_full_end type struct record_full_entry to
519 record_full_arch_list. */
522 record_full_arch_list_add_end (void)
524 struct record_full_entry
*rec
;
526 if (record_debug
> 1)
527 fprintf_unfiltered (gdb_stdlog
,
528 "Process record: add end to arch list.\n");
530 rec
= record_full_end_alloc ();
531 rec
->u
.end
.sigval
= GDB_SIGNAL_0
;
532 rec
->u
.end
.insn_num
= ++record_full_insn_count
;
534 record_full_arch_list_add (rec
);
540 record_full_check_insn_num (void)
542 if (record_full_insn_num
== record_full_insn_max_num
)
544 /* Ask user what to do. */
545 if (record_full_stop_at_limit
)
547 if (!yquery (_("Do you want to auto delete previous execution "
548 "log entries when record/replay buffer becomes "
549 "full (record full stop-at-limit)?")))
550 error (_("Process record: stopped by user."));
551 record_full_stop_at_limit
= 0;
557 record_full_arch_list_cleanups (void *ignore
)
559 record_full_list_release (record_full_arch_list_tail
);
562 /* Before inferior step (when GDB record the running message, inferior
563 only can step), GDB will call this function to record the values to
564 record_full_list. This function will call gdbarch_process_record to
565 record the running message of inferior and set them to
566 record_full_arch_list, and add it to record_full_list. */
569 record_full_message (struct regcache
*regcache
, enum gdb_signal signal
)
572 struct gdbarch
*gdbarch
= regcache
->arch ();
573 struct cleanup
*old_cleanups
574 = make_cleanup (record_full_arch_list_cleanups
, 0);
576 record_full_arch_list_head
= NULL
;
577 record_full_arch_list_tail
= NULL
;
579 /* Check record_full_insn_num. */
580 record_full_check_insn_num ();
582 /* If gdb sends a signal value to target_resume,
583 save it in the 'end' field of the previous instruction.
585 Maybe process record should record what really happened,
586 rather than what gdb pretends has happened.
588 So if Linux delivered the signal to the child process during
589 the record mode, we will record it and deliver it again in
592 If user says "ignore this signal" during the record mode, then
593 it will be ignored again during the replay mode (no matter if
594 the user says something different, like "deliver this signal"
595 during the replay mode).
597 User should understand that nothing he does during the replay
598 mode will change the behavior of the child. If he tries,
599 then that is a user error.
601 But we should still deliver the signal to gdb during the replay,
602 if we delivered it during the recording. Therefore we should
603 record the signal during record_full_wait, not
604 record_full_resume. */
605 if (record_full_list
!= &record_full_first
) /* FIXME better way to check */
607 gdb_assert (record_full_list
->type
== record_full_end
);
608 record_full_list
->u
.end
.sigval
= signal
;
611 if (signal
== GDB_SIGNAL_0
612 || !gdbarch_process_record_signal_p (gdbarch
))
613 ret
= gdbarch_process_record (gdbarch
,
615 regcache_read_pc (regcache
));
617 ret
= gdbarch_process_record_signal (gdbarch
,
622 error (_("Process record: inferior program stopped."));
624 error (_("Process record: failed to record execution log."));
626 discard_cleanups (old_cleanups
);
628 record_full_list
->next
= record_full_arch_list_head
;
629 record_full_arch_list_head
->prev
= record_full_list
;
630 record_full_list
= record_full_arch_list_tail
;
632 if (record_full_insn_num
== record_full_insn_max_num
)
633 record_full_list_release_first ();
635 record_full_insn_num
++;
639 record_full_message_wrapper_safe (struct regcache
*regcache
,
640 enum gdb_signal signal
)
644 record_full_message (regcache
, signal
);
646 CATCH (ex
, RETURN_MASK_ALL
)
648 exception_print (gdb_stderr
, ex
);
656 /* Set to 1 if record_full_store_registers and record_full_xfer_partial
657 doesn't need record. */
659 static int record_full_gdb_operation_disable
= 0;
661 scoped_restore_tmpl
<int>
662 record_full_gdb_operation_disable_set (void)
664 return make_scoped_restore (&record_full_gdb_operation_disable
, 1);
667 /* Flag set to TRUE for target_stopped_by_watchpoint. */
668 static enum target_stop_reason record_full_stop_reason
669 = TARGET_STOPPED_BY_NO_REASON
;
671 /* Execute one instruction from the record log. Each instruction in
672 the log will be represented by an arbitrary sequence of register
673 entries and memory entries, followed by an 'end' entry. */
676 record_full_exec_insn (struct regcache
*regcache
,
677 struct gdbarch
*gdbarch
,
678 struct record_full_entry
*entry
)
682 case record_full_reg
: /* reg */
684 gdb::byte_vector
reg (entry
->u
.reg
.len
);
686 if (record_debug
> 1)
687 fprintf_unfiltered (gdb_stdlog
,
688 "Process record: record_full_reg %s to "
689 "inferior num = %d.\n",
690 host_address_to_string (entry
),
693 regcache_cooked_read (regcache
, entry
->u
.reg
.num
, reg
.data ());
694 regcache_cooked_write (regcache
, entry
->u
.reg
.num
,
695 record_full_get_loc (entry
));
696 memcpy (record_full_get_loc (entry
), reg
.data (), entry
->u
.reg
.len
);
700 case record_full_mem
: /* mem */
702 /* Nothing to do if the entry is flagged not_accessible. */
703 if (!entry
->u
.mem
.mem_entry_not_accessible
)
705 gdb::byte_vector
mem (entry
->u
.mem
.len
);
707 if (record_debug
> 1)
708 fprintf_unfiltered (gdb_stdlog
,
709 "Process record: record_full_mem %s to "
710 "inferior addr = %s len = %d.\n",
711 host_address_to_string (entry
),
712 paddress (gdbarch
, entry
->u
.mem
.addr
),
715 if (record_read_memory (gdbarch
,
716 entry
->u
.mem
.addr
, mem
.data (),
718 entry
->u
.mem
.mem_entry_not_accessible
= 1;
721 if (target_write_memory (entry
->u
.mem
.addr
,
722 record_full_get_loc (entry
),
725 entry
->u
.mem
.mem_entry_not_accessible
= 1;
727 warning (_("Process record: error writing memory at "
728 "addr = %s len = %d."),
729 paddress (gdbarch
, entry
->u
.mem
.addr
),
734 memcpy (record_full_get_loc (entry
), mem
.data (),
737 /* We've changed memory --- check if a hardware
738 watchpoint should trap. Note that this
739 presently assumes the target beneath supports
740 continuable watchpoints. On non-continuable
741 watchpoints target, we'll want to check this
742 _before_ actually doing the memory change, and
743 not doing the change at all if the watchpoint
745 if (hardware_watchpoint_inserted_in_range
746 (regcache
->aspace (),
747 entry
->u
.mem
.addr
, entry
->u
.mem
.len
))
748 record_full_stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
757 static void record_full_restore (void);
759 /* Asynchronous signal handle registered as event loop source for when
760 we have pending events ready to be passed to the core. */
762 static struct async_event_handler
*record_full_async_inferior_event_token
;
765 record_full_async_inferior_event_handler (gdb_client_data data
)
767 inferior_event_handler (INF_REG_EVENT
, NULL
);
770 /* Open the process record target. */
773 record_full_core_open_1 (const char *name
, int from_tty
)
775 struct regcache
*regcache
= get_current_regcache ();
776 int regnum
= gdbarch_num_regs (regcache
->arch ());
779 /* Get record_full_core_regbuf. */
780 target_fetch_registers (regcache
, -1);
781 record_full_core_regbuf
= new detached_regcache (regcache
->arch (), false);
783 for (i
= 0; i
< regnum
; i
++)
784 record_full_core_regbuf
->raw_supply (i
, *regcache
);
786 /* Get record_full_core_start and record_full_core_end. */
787 if (build_section_table (core_bfd
, &record_full_core_start
,
788 &record_full_core_end
))
790 delete record_full_core_regbuf
;
791 record_full_core_regbuf
= NULL
;
792 error (_("\"%s\": Can't find sections: %s"),
793 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
796 push_target (&record_full_core_ops
);
797 record_full_restore ();
800 /* "to_open" target method for 'live' processes. */
803 record_full_open_1 (const char *name
, int from_tty
)
806 fprintf_unfiltered (gdb_stdlog
, "Process record: record_full_open_1\n");
809 if (!target_has_execution
)
810 error (_("Process record: the program is not being run."));
812 error (_("Process record target can't debug inferior in non-stop mode "
815 if (!gdbarch_process_record_p (target_gdbarch ()))
816 error (_("Process record: the current architecture doesn't support "
817 "record function."));
819 push_target (&record_full_ops
);
822 static void record_full_init_record_breakpoints (void);
824 /* "to_open" target method. Open the process record target. */
827 record_full_open (const char *name
, int from_tty
)
830 fprintf_unfiltered (gdb_stdlog
, "Process record: record_full_open\n");
835 record_full_insn_num
= 0;
836 record_full_insn_count
= 0;
837 record_full_list
= &record_full_first
;
838 record_full_list
->next
= NULL
;
841 record_full_core_open_1 (name
, from_tty
);
843 record_full_open_1 (name
, from_tty
);
845 /* Register extra event sources in the event loop. */
846 record_full_async_inferior_event_token
847 = create_async_event_handler (record_full_async_inferior_event_handler
,
850 record_full_init_record_breakpoints ();
852 gdb::observers::record_changed
.notify (current_inferior (), 1, "full", NULL
);
855 /* "to_close" target method. Close the process record target. */
858 record_full_close (struct target_ops
*self
)
860 struct record_full_core_buf_entry
*entry
;
863 fprintf_unfiltered (gdb_stdlog
, "Process record: record_full_close\n");
865 record_full_list_release (record_full_list
);
867 /* Release record_full_core_regbuf. */
868 if (record_full_core_regbuf
)
870 delete record_full_core_regbuf
;
871 record_full_core_regbuf
= NULL
;
874 /* Release record_full_core_buf_list. */
875 if (record_full_core_buf_list
)
877 for (entry
= record_full_core_buf_list
->prev
; entry
;
880 xfree (record_full_core_buf_list
);
881 record_full_core_buf_list
= entry
;
883 record_full_core_buf_list
= NULL
;
886 if (record_full_async_inferior_event_token
)
887 delete_async_event_handler (&record_full_async_inferior_event_token
);
890 /* "to_async" target method. */
893 record_full_async (struct target_ops
*ops
, int enable
)
896 mark_async_event_handler (record_full_async_inferior_event_token
);
898 clear_async_event_handler (record_full_async_inferior_event_token
);
900 ops
->beneath
->to_async (ops
->beneath
, enable
);
903 static int record_full_resume_step
= 0;
905 /* True if we've been resumed, and so each record_full_wait call should
906 advance execution. If this is false, record_full_wait will return a
907 TARGET_WAITKIND_IGNORE. */
908 static int record_full_resumed
= 0;
910 /* The execution direction of the last resume we got. This is
911 necessary for async mode. Vis (order is not strictly accurate):
913 1. user has the global execution direction set to forward
914 2. user does a reverse-step command
915 3. record_full_resume is called with global execution direction
916 temporarily switched to reverse
917 4. GDB's execution direction is reverted back to forward
918 5. target record notifies event loop there's an event to handle
919 6. infrun asks the target which direction was it going, and switches
920 the global execution direction accordingly (to reverse)
921 7. infrun polls an event out of the record target, and handles it
922 8. GDB goes back to the event loop, and goto #4.
924 static enum exec_direction_kind record_full_execution_dir
= EXEC_FORWARD
;
926 /* "to_resume" target method. Resume the process record target. */
929 record_full_resume (struct target_ops
*ops
, ptid_t ptid
, int step
,
930 enum gdb_signal signal
)
932 record_full_resume_step
= step
;
933 record_full_resumed
= 1;
934 record_full_execution_dir
= execution_direction
;
936 if (!RECORD_FULL_IS_REPLAY
)
938 struct gdbarch
*gdbarch
= target_thread_architecture (ptid
);
940 record_full_message (get_current_regcache (), signal
);
944 /* This is not hard single step. */
945 if (!gdbarch_software_single_step_p (gdbarch
))
947 /* This is a normal continue. */
952 /* This arch supports soft single step. */
953 if (thread_has_single_step_breakpoints_set (inferior_thread ()))
955 /* This is a soft single step. */
956 record_full_resume_step
= 1;
959 step
= !insert_single_step_breakpoints (gdbarch
);
963 /* Make sure the target beneath reports all signals. */
964 target_pass_signals (0, NULL
);
966 ops
->beneath
->to_resume (ops
->beneath
, ptid
, step
, signal
);
969 /* We are about to start executing the inferior (or simulate it),
970 let's register it with the event loop. */
971 if (target_can_async_p ())
975 /* "to_commit_resume" method for process record target. */
978 record_full_commit_resume (struct target_ops
*ops
)
980 if (!RECORD_FULL_IS_REPLAY
)
981 ops
->beneath
->to_commit_resume (ops
->beneath
);
984 static int record_full_get_sig
= 0;
986 /* SIGINT signal handler, registered by "to_wait" method. */
989 record_full_sig_handler (int signo
)
992 fprintf_unfiltered (gdb_stdlog
, "Process record: get a signal\n");
994 /* It will break the running inferior in replay mode. */
995 record_full_resume_step
= 1;
997 /* It will let record_full_wait set inferior status to get the signal
999 record_full_get_sig
= 1;
1003 record_full_wait_cleanups (void *ignore
)
1005 if (execution_direction
== EXEC_REVERSE
)
1007 if (record_full_list
->next
)
1008 record_full_list
= record_full_list
->next
;
1011 record_full_list
= record_full_list
->prev
;
1014 /* "to_wait" target method for process record target.
1016 In record mode, the target is always run in singlestep mode
1017 (even when gdb says to continue). The to_wait method intercepts
1018 the stop events and determines which ones are to be passed on to
1019 gdb. Most stop events are just singlestep events that gdb is not
1020 to know about, so the to_wait method just records them and keeps
1023 In replay mode, this function emulates the recorded execution log,
1024 one instruction at a time (forward or backward), and determines
1028 record_full_wait_1 (struct target_ops
*ops
,
1029 ptid_t ptid
, struct target_waitstatus
*status
,
1032 scoped_restore restore_operation_disable
1033 = record_full_gdb_operation_disable_set ();
1036 fprintf_unfiltered (gdb_stdlog
,
1037 "Process record: record_full_wait "
1038 "record_full_resume_step = %d, "
1039 "record_full_resumed = %d, direction=%s\n",
1040 record_full_resume_step
, record_full_resumed
,
1041 record_full_execution_dir
== EXEC_FORWARD
1042 ? "forward" : "reverse");
1044 if (!record_full_resumed
)
1046 gdb_assert ((options
& TARGET_WNOHANG
) != 0);
1048 /* No interesting event. */
1049 status
->kind
= TARGET_WAITKIND_IGNORE
;
1050 return minus_one_ptid
;
1053 record_full_get_sig
= 0;
1054 signal (SIGINT
, record_full_sig_handler
);
1056 record_full_stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
1058 if (!RECORD_FULL_IS_REPLAY
&& ops
!= &record_full_core_ops
)
1060 if (record_full_resume_step
)
1062 /* This is a single step. */
1063 return ops
->beneath
->to_wait (ops
->beneath
, ptid
, status
, options
);
1067 /* This is not a single step. */
1070 struct gdbarch
*gdbarch
= target_thread_architecture (inferior_ptid
);
1074 struct thread_info
*tp
;
1076 ret
= ops
->beneath
->to_wait (ops
->beneath
, ptid
, status
, options
);
1077 if (status
->kind
== TARGET_WAITKIND_IGNORE
)
1080 fprintf_unfiltered (gdb_stdlog
,
1081 "Process record: record_full_wait "
1082 "target beneath not done yet\n");
1086 ALL_NON_EXITED_THREADS (tp
)
1087 delete_single_step_breakpoints (tp
);
1089 if (record_full_resume_step
)
1092 /* Is this a SIGTRAP? */
1093 if (status
->kind
== TARGET_WAITKIND_STOPPED
1094 && status
->value
.sig
== GDB_SIGNAL_TRAP
)
1096 struct regcache
*regcache
;
1097 enum target_stop_reason
*stop_reason_p
1098 = &record_full_stop_reason
;
1100 /* Yes -- this is likely our single-step finishing,
1101 but check if there's any reason the core would be
1102 interested in the event. */
1104 registers_changed ();
1105 regcache
= get_current_regcache ();
1106 tmp_pc
= regcache_read_pc (regcache
);
1107 const struct address_space
*aspace
= regcache
->aspace ();
1109 if (target_stopped_by_watchpoint ())
1111 /* Always interested in watchpoints. */
1113 else if (record_check_stopped_by_breakpoint (aspace
, tmp_pc
,
1116 /* There is a breakpoint here. Let the core
1121 /* This is a single-step trap. Record the
1122 insn and issue another step.
1123 FIXME: this part can be a random SIGTRAP too.
1124 But GDB cannot handle it. */
1127 if (!record_full_message_wrapper_safe (regcache
,
1130 status
->kind
= TARGET_WAITKIND_STOPPED
;
1131 status
->value
.sig
= GDB_SIGNAL_0
;
1135 if (gdbarch_software_single_step_p (gdbarch
))
1137 /* Try to insert the software single step breakpoint.
1138 If insert success, set step to 0. */
1139 set_executing (inferior_ptid
, 0);
1140 reinit_frame_cache ();
1142 step
= !insert_single_step_breakpoints (gdbarch
);
1144 set_executing (inferior_ptid
, 1);
1148 fprintf_unfiltered (gdb_stdlog
,
1149 "Process record: record_full_wait "
1150 "issuing one more step in the "
1151 "target beneath\n");
1152 ops
->beneath
->to_resume (ops
->beneath
, ptid
, step
,
1154 ops
->beneath
->to_commit_resume (ops
->beneath
);
1159 /* The inferior is broken by a breakpoint or a signal. */
1168 struct regcache
*regcache
= get_current_regcache ();
1169 struct gdbarch
*gdbarch
= regcache
->arch ();
1170 const struct address_space
*aspace
= regcache
->aspace ();
1171 int continue_flag
= 1;
1172 int first_record_full_end
= 1;
1173 struct cleanup
*old_cleanups
1174 = make_cleanup (record_full_wait_cleanups
, 0);
1177 record_full_stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
1178 status
->kind
= TARGET_WAITKIND_STOPPED
;
1180 /* Check breakpoint when forward execute. */
1181 if (execution_direction
== EXEC_FORWARD
)
1183 tmp_pc
= regcache_read_pc (regcache
);
1184 if (record_check_stopped_by_breakpoint (aspace
, tmp_pc
,
1185 &record_full_stop_reason
))
1188 fprintf_unfiltered (gdb_stdlog
,
1189 "Process record: break at %s.\n",
1190 paddress (gdbarch
, tmp_pc
));
1195 /* If GDB is in terminal_inferior mode, it will not get the signal.
1196 And in GDB replay mode, GDB doesn't need to be in terminal_inferior
1197 mode, because inferior will not executed.
1198 Then set it to terminal_ours to make GDB get the signal. */
1199 target_terminal::ours ();
1201 /* In EXEC_FORWARD mode, record_full_list points to the tail of prev
1203 if (execution_direction
== EXEC_FORWARD
&& record_full_list
->next
)
1204 record_full_list
= record_full_list
->next
;
1206 /* Loop over the record_full_list, looking for the next place to
1210 /* Check for beginning and end of log. */
1211 if (execution_direction
== EXEC_REVERSE
1212 && record_full_list
== &record_full_first
)
1214 /* Hit beginning of record log in reverse. */
1215 status
->kind
= TARGET_WAITKIND_NO_HISTORY
;
1218 if (execution_direction
!= EXEC_REVERSE
&& !record_full_list
->next
)
1220 /* Hit end of record log going forward. */
1221 status
->kind
= TARGET_WAITKIND_NO_HISTORY
;
1225 record_full_exec_insn (regcache
, gdbarch
, record_full_list
);
1227 if (record_full_list
->type
== record_full_end
)
1229 if (record_debug
> 1)
1230 fprintf_unfiltered (gdb_stdlog
,
1231 "Process record: record_full_end %s to "
1233 host_address_to_string (record_full_list
));
1235 if (first_record_full_end
&& execution_direction
== EXEC_REVERSE
)
1237 /* When reverse excute, the first record_full_end is the
1238 part of current instruction. */
1239 first_record_full_end
= 0;
1243 /* In EXEC_REVERSE mode, this is the record_full_end of prev
1245 In EXEC_FORWARD mode, this is the record_full_end of
1246 current instruction. */
1248 if (record_full_resume_step
)
1250 if (record_debug
> 1)
1251 fprintf_unfiltered (gdb_stdlog
,
1252 "Process record: step.\n");
1256 /* check breakpoint */
1257 tmp_pc
= regcache_read_pc (regcache
);
1258 if (record_check_stopped_by_breakpoint (aspace
, tmp_pc
,
1259 &record_full_stop_reason
))
1262 fprintf_unfiltered (gdb_stdlog
,
1263 "Process record: break "
1265 paddress (gdbarch
, tmp_pc
));
1270 if (record_full_stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
1273 fprintf_unfiltered (gdb_stdlog
,
1274 "Process record: hit hw "
1278 /* Check target signal */
1279 if (record_full_list
->u
.end
.sigval
!= GDB_SIGNAL_0
)
1280 /* FIXME: better way to check */
1287 if (execution_direction
== EXEC_REVERSE
)
1289 if (record_full_list
->prev
)
1290 record_full_list
= record_full_list
->prev
;
1294 if (record_full_list
->next
)
1295 record_full_list
= record_full_list
->next
;
1299 while (continue_flag
);
1302 if (record_full_get_sig
)
1303 status
->value
.sig
= GDB_SIGNAL_INT
;
1304 else if (record_full_list
->u
.end
.sigval
!= GDB_SIGNAL_0
)
1305 /* FIXME: better way to check */
1306 status
->value
.sig
= record_full_list
->u
.end
.sigval
;
1308 status
->value
.sig
= GDB_SIGNAL_TRAP
;
1310 discard_cleanups (old_cleanups
);
1313 signal (SIGINT
, handle_sigint
);
1315 return inferior_ptid
;
1319 record_full_wait (struct target_ops
*ops
,
1320 ptid_t ptid
, struct target_waitstatus
*status
,
1325 return_ptid
= record_full_wait_1 (ops
, ptid
, status
, options
);
1326 if (status
->kind
!= TARGET_WAITKIND_IGNORE
)
1328 /* We're reporting a stop. Make sure any spurious
1329 target_wait(WNOHANG) doesn't advance the target until the
1330 core wants us resumed again. */
1331 record_full_resumed
= 0;
1337 record_full_stopped_by_watchpoint (struct target_ops
*ops
)
1339 if (RECORD_FULL_IS_REPLAY
)
1340 return record_full_stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
1342 return ops
->beneath
->to_stopped_by_watchpoint (ops
->beneath
);
1346 record_full_stopped_data_address (struct target_ops
*ops
, CORE_ADDR
*addr_p
)
1348 if (RECORD_FULL_IS_REPLAY
)
1351 return ops
->beneath
->to_stopped_data_address (ops
->beneath
, addr_p
);
1354 /* The to_stopped_by_sw_breakpoint method of target record-full. */
1357 record_full_stopped_by_sw_breakpoint (struct target_ops
*ops
)
1359 return record_full_stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
;
1362 /* The to_supports_stopped_by_sw_breakpoint method of target
1366 record_full_supports_stopped_by_sw_breakpoint (struct target_ops
*ops
)
1371 /* The to_stopped_by_hw_breakpoint method of target record-full. */
1374 record_full_stopped_by_hw_breakpoint (struct target_ops
*ops
)
1376 return record_full_stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
;
1379 /* The to_supports_stopped_by_sw_breakpoint method of target
1383 record_full_supports_stopped_by_hw_breakpoint (struct target_ops
*ops
)
1388 /* Record registers change (by user or by GDB) to list as an instruction. */
1391 record_full_registers_change (struct regcache
*regcache
, int regnum
)
1393 /* Check record_full_insn_num. */
1394 record_full_check_insn_num ();
1396 record_full_arch_list_head
= NULL
;
1397 record_full_arch_list_tail
= NULL
;
1403 for (i
= 0; i
< gdbarch_num_regs (regcache
->arch ()); i
++)
1405 if (record_full_arch_list_add_reg (regcache
, i
))
1407 record_full_list_release (record_full_arch_list_tail
);
1408 error (_("Process record: failed to record execution log."));
1414 if (record_full_arch_list_add_reg (regcache
, regnum
))
1416 record_full_list_release (record_full_arch_list_tail
);
1417 error (_("Process record: failed to record execution log."));
1420 if (record_full_arch_list_add_end ())
1422 record_full_list_release (record_full_arch_list_tail
);
1423 error (_("Process record: failed to record execution log."));
1425 record_full_list
->next
= record_full_arch_list_head
;
1426 record_full_arch_list_head
->prev
= record_full_list
;
1427 record_full_list
= record_full_arch_list_tail
;
1429 if (record_full_insn_num
== record_full_insn_max_num
)
1430 record_full_list_release_first ();
1432 record_full_insn_num
++;
1435 /* "to_store_registers" method for process record target. */
1438 record_full_store_registers (struct target_ops
*ops
,
1439 struct regcache
*regcache
,
1442 if (!record_full_gdb_operation_disable
)
1444 if (RECORD_FULL_IS_REPLAY
)
1448 /* Let user choose if he wants to write register or not. */
1451 query (_("Because GDB is in replay mode, changing the "
1452 "value of a register will make the execution "
1453 "log unusable from this point onward. "
1454 "Change all registers?"));
1457 query (_("Because GDB is in replay mode, changing the value "
1458 "of a register will make the execution log unusable "
1459 "from this point onward. Change register %s?"),
1460 gdbarch_register_name (regcache
->arch (),
1465 /* Invalidate the value of regcache that was set in function
1466 "regcache_raw_write". */
1472 i
< gdbarch_num_regs (regcache
->arch ());
1474 regcache_invalidate (regcache
, i
);
1477 regcache_invalidate (regcache
, regno
);
1479 error (_("Process record canceled the operation."));
1482 /* Destroy the record from here forward. */
1483 record_full_list_release_following (record_full_list
);
1486 record_full_registers_change (regcache
, regno
);
1488 ops
->beneath
->to_store_registers (ops
->beneath
, regcache
, regno
);
1491 /* "to_xfer_partial" method. Behavior is conditional on
1492 RECORD_FULL_IS_REPLAY.
1493 In replay mode, we cannot write memory unles we are willing to
1494 invalidate the record/replay log from this point forward. */
1496 static enum target_xfer_status
1497 record_full_xfer_partial (struct target_ops
*ops
, enum target_object object
,
1498 const char *annex
, gdb_byte
*readbuf
,
1499 const gdb_byte
*writebuf
, ULONGEST offset
,
1500 ULONGEST len
, ULONGEST
*xfered_len
)
1502 if (!record_full_gdb_operation_disable
1503 && (object
== TARGET_OBJECT_MEMORY
1504 || object
== TARGET_OBJECT_RAW_MEMORY
) && writebuf
)
1506 if (RECORD_FULL_IS_REPLAY
)
1508 /* Let user choose if he wants to write memory or not. */
1509 if (!query (_("Because GDB is in replay mode, writing to memory "
1510 "will make the execution log unusable from this "
1511 "point onward. Write memory at address %s?"),
1512 paddress (target_gdbarch (), offset
)))
1513 error (_("Process record canceled the operation."));
1515 /* Destroy the record from here forward. */
1516 record_full_list_release_following (record_full_list
);
1519 /* Check record_full_insn_num */
1520 record_full_check_insn_num ();
1522 /* Record registers change to list as an instruction. */
1523 record_full_arch_list_head
= NULL
;
1524 record_full_arch_list_tail
= NULL
;
1525 if (record_full_arch_list_add_mem (offset
, len
))
1527 record_full_list_release (record_full_arch_list_tail
);
1529 fprintf_unfiltered (gdb_stdlog
,
1530 "Process record: failed to record "
1532 return TARGET_XFER_E_IO
;
1534 if (record_full_arch_list_add_end ())
1536 record_full_list_release (record_full_arch_list_tail
);
1538 fprintf_unfiltered (gdb_stdlog
,
1539 "Process record: failed to record "
1541 return TARGET_XFER_E_IO
;
1543 record_full_list
->next
= record_full_arch_list_head
;
1544 record_full_arch_list_head
->prev
= record_full_list
;
1545 record_full_list
= record_full_arch_list_tail
;
1547 if (record_full_insn_num
== record_full_insn_max_num
)
1548 record_full_list_release_first ();
1550 record_full_insn_num
++;
1553 return ops
->beneath
->to_xfer_partial (ops
->beneath
, object
, annex
,
1554 readbuf
, writebuf
, offset
,
1558 /* This structure represents a breakpoint inserted while the record
1559 target is active. We use this to know when to install/remove
1560 breakpoints in/from the target beneath. For example, a breakpoint
1561 may be inserted while recording, but removed when not replaying nor
1562 recording. In that case, the breakpoint had not been inserted on
1563 the target beneath, so we should not try to remove it there. */
1565 struct record_full_breakpoint
1567 /* The address and address space the breakpoint was set at. */
1568 struct address_space
*address_space
;
1571 /* True when the breakpoint has been also installed in the target
1572 beneath. This will be false for breakpoints set during replay or
1574 int in_target_beneath
;
1577 typedef struct record_full_breakpoint
*record_full_breakpoint_p
;
1578 DEF_VEC_P(record_full_breakpoint_p
);
1580 /* The list of breakpoints inserted while the record target is
1582 VEC(record_full_breakpoint_p
) *record_full_breakpoints
= NULL
;
1585 record_full_sync_record_breakpoints (struct bp_location
*loc
, void *data
)
1587 if (loc
->loc_type
!= bp_loc_software_breakpoint
)
1592 struct record_full_breakpoint
*bp
= XNEW (struct record_full_breakpoint
);
1594 bp
->addr
= loc
->target_info
.placed_address
;
1595 bp
->address_space
= loc
->target_info
.placed_address_space
;
1597 bp
->in_target_beneath
= 1;
1599 VEC_safe_push (record_full_breakpoint_p
, record_full_breakpoints
, bp
);
1603 /* Sync existing breakpoints to record_full_breakpoints. */
1606 record_full_init_record_breakpoints (void)
1608 VEC_free (record_full_breakpoint_p
, record_full_breakpoints
);
1610 iterate_over_bp_locations (record_full_sync_record_breakpoints
);
1613 /* Behavior is conditional on RECORD_FULL_IS_REPLAY. We will not actually
1614 insert or remove breakpoints in the real target when replaying, nor
1618 record_full_insert_breakpoint (struct target_ops
*ops
,
1619 struct gdbarch
*gdbarch
,
1620 struct bp_target_info
*bp_tgt
)
1622 struct record_full_breakpoint
*bp
;
1623 int in_target_beneath
= 0;
1626 if (!RECORD_FULL_IS_REPLAY
)
1628 /* When recording, we currently always single-step, so we don't
1629 really need to install regular breakpoints in the inferior.
1630 However, we do have to insert software single-step
1631 breakpoints, in case the target can't hardware step. To keep
1632 things simple, we always insert. */
1635 scoped_restore restore_operation_disable
1636 = record_full_gdb_operation_disable_set ();
1637 ret
= ops
->beneath
->to_insert_breakpoint (ops
->beneath
, gdbarch
, bp_tgt
);
1642 in_target_beneath
= 1;
1645 /* Use the existing entries if found in order to avoid duplication
1646 in record_full_breakpoints. */
1649 VEC_iterate (record_full_breakpoint_p
,
1650 record_full_breakpoints
, ix
, bp
);
1653 if (bp
->addr
== bp_tgt
->placed_address
1654 && bp
->address_space
== bp_tgt
->placed_address_space
)
1656 gdb_assert (bp
->in_target_beneath
== in_target_beneath
);
1661 bp
= XNEW (struct record_full_breakpoint
);
1662 bp
->addr
= bp_tgt
->placed_address
;
1663 bp
->address_space
= bp_tgt
->placed_address_space
;
1664 bp
->in_target_beneath
= in_target_beneath
;
1665 VEC_safe_push (record_full_breakpoint_p
, record_full_breakpoints
, bp
);
1669 /* "to_remove_breakpoint" method for process record target. */
1672 record_full_remove_breakpoint (struct target_ops
*ops
,
1673 struct gdbarch
*gdbarch
,
1674 struct bp_target_info
*bp_tgt
,
1675 enum remove_bp_reason reason
)
1677 struct record_full_breakpoint
*bp
;
1681 VEC_iterate (record_full_breakpoint_p
,
1682 record_full_breakpoints
, ix
, bp
);
1685 if (bp
->addr
== bp_tgt
->placed_address
1686 && bp
->address_space
== bp_tgt
->placed_address_space
)
1688 if (bp
->in_target_beneath
)
1692 scoped_restore restore_operation_disable
1693 = record_full_gdb_operation_disable_set ();
1694 ret
= ops
->beneath
->to_remove_breakpoint (ops
->beneath
, gdbarch
,
1700 if (reason
== REMOVE_BREAKPOINT
)
1702 VEC_unordered_remove (record_full_breakpoint_p
,
1703 record_full_breakpoints
, ix
);
1709 gdb_assert_not_reached ("removing unknown breakpoint");
1712 /* "to_can_execute_reverse" method for process record target. */
1715 record_full_can_execute_reverse (struct target_ops
*self
)
1720 /* "to_get_bookmark" method for process record and prec over core. */
1723 record_full_get_bookmark (struct target_ops
*self
, const char *args
,
1728 /* Return stringified form of instruction count. */
1729 if (record_full_list
&& record_full_list
->type
== record_full_end
)
1730 ret
= xstrdup (pulongest (record_full_list
->u
.end
.insn_num
));
1735 fprintf_unfiltered (gdb_stdlog
,
1736 "record_full_get_bookmark returns %s\n", ret
);
1738 fprintf_unfiltered (gdb_stdlog
,
1739 "record_full_get_bookmark returns NULL\n");
1741 return (gdb_byte
*) ret
;
1744 /* "to_goto_bookmark" method for process record and prec over core. */
1747 record_full_goto_bookmark (struct target_ops
*self
,
1748 const gdb_byte
*raw_bookmark
, int from_tty
)
1750 const char *bookmark
= (const char *) raw_bookmark
;
1753 fprintf_unfiltered (gdb_stdlog
,
1754 "record_full_goto_bookmark receives %s\n", bookmark
);
1756 std::string name_holder
;
1757 if (bookmark
[0] == '\'' || bookmark
[0] == '\"')
1759 if (bookmark
[strlen (bookmark
) - 1] != bookmark
[0])
1760 error (_("Unbalanced quotes: %s"), bookmark
);
1762 name_holder
= std::string (bookmark
+ 1, strlen (bookmark
) - 2);
1763 bookmark
= name_holder
.c_str ();
1766 record_goto (bookmark
);
1769 static enum exec_direction_kind
1770 record_full_execution_direction (struct target_ops
*self
)
1772 return record_full_execution_dir
;
1775 /* The to_record_method method of target record-full. */
1778 record_full_record_method (struct target_ops
*self
, ptid_t ptid
)
1780 return RECORD_METHOD_FULL
;
1784 record_full_info (struct target_ops
*self
)
1786 struct record_full_entry
*p
;
1788 if (RECORD_FULL_IS_REPLAY
)
1789 printf_filtered (_("Replay mode:\n"));
1791 printf_filtered (_("Record mode:\n"));
1793 /* Find entry for first actual instruction in the log. */
1794 for (p
= record_full_first
.next
;
1795 p
!= NULL
&& p
->type
!= record_full_end
;
1799 /* Do we have a log at all? */
1800 if (p
!= NULL
&& p
->type
== record_full_end
)
1802 /* Display instruction number for first instruction in the log. */
1803 printf_filtered (_("Lowest recorded instruction number is %s.\n"),
1804 pulongest (p
->u
.end
.insn_num
));
1806 /* If in replay mode, display where we are in the log. */
1807 if (RECORD_FULL_IS_REPLAY
)
1808 printf_filtered (_("Current instruction number is %s.\n"),
1809 pulongest (record_full_list
->u
.end
.insn_num
));
1811 /* Display instruction number for last instruction in the log. */
1812 printf_filtered (_("Highest recorded instruction number is %s.\n"),
1813 pulongest (record_full_insn_count
));
1815 /* Display log count. */
1816 printf_filtered (_("Log contains %u instructions.\n"),
1817 record_full_insn_num
);
1820 printf_filtered (_("No instructions have been logged.\n"));
1822 /* Display max log size. */
1823 printf_filtered (_("Max logged instructions is %u.\n"),
1824 record_full_insn_max_num
);
1827 /* The "to_record_delete" target method. */
1830 record_full_delete (struct target_ops
*self
)
1832 record_full_list_release_following (record_full_list
);
1835 /* The "to_record_is_replaying" target method. */
1838 record_full_is_replaying (struct target_ops
*self
, ptid_t ptid
)
1840 return RECORD_FULL_IS_REPLAY
;
1843 /* The "to_record_will_replay" target method. */
1846 record_full_will_replay (struct target_ops
*self
, ptid_t ptid
, int dir
)
1848 /* We can currently only record when executing forwards. Should we be able
1849 to record when executing backwards on targets that support reverse
1850 execution, this needs to be changed. */
1852 return RECORD_FULL_IS_REPLAY
|| dir
== EXEC_REVERSE
;
1855 /* Go to a specific entry. */
1858 record_full_goto_entry (struct record_full_entry
*p
)
1861 error (_("Target insn not found."));
1862 else if (p
== record_full_list
)
1863 error (_("Already at target insn."));
1864 else if (p
->u
.end
.insn_num
> record_full_list
->u
.end
.insn_num
)
1866 printf_filtered (_("Go forward to insn number %s\n"),
1867 pulongest (p
->u
.end
.insn_num
));
1868 record_full_goto_insn (p
, EXEC_FORWARD
);
1872 printf_filtered (_("Go backward to insn number %s\n"),
1873 pulongest (p
->u
.end
.insn_num
));
1874 record_full_goto_insn (p
, EXEC_REVERSE
);
1877 registers_changed ();
1878 reinit_frame_cache ();
1879 stop_pc
= regcache_read_pc (get_current_regcache ());
1880 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1883 /* The "to_goto_record_begin" target method. */
1886 record_full_goto_begin (struct target_ops
*self
)
1888 struct record_full_entry
*p
= NULL
;
1890 for (p
= &record_full_first
; p
!= NULL
; p
= p
->next
)
1891 if (p
->type
== record_full_end
)
1894 record_full_goto_entry (p
);
1897 /* The "to_goto_record_end" target method. */
1900 record_full_goto_end (struct target_ops
*self
)
1902 struct record_full_entry
*p
= NULL
;
1904 for (p
= record_full_list
; p
->next
!= NULL
; p
= p
->next
)
1906 for (; p
!= NULL
; p
= p
->prev
)
1907 if (p
->type
== record_full_end
)
1910 record_full_goto_entry (p
);
1913 /* The "to_goto_record" target method. */
1916 record_full_goto (struct target_ops
*self
, ULONGEST target_insn
)
1918 struct record_full_entry
*p
= NULL
;
1920 for (p
= &record_full_first
; p
!= NULL
; p
= p
->next
)
1921 if (p
->type
== record_full_end
&& p
->u
.end
.insn_num
== target_insn
)
1924 record_full_goto_entry (p
);
1927 /* The "to_record_stop_replaying" target method. */
1930 record_full_stop_replaying (struct target_ops
*self
)
1932 record_full_goto_end (self
);
1936 init_record_full_ops (void)
1938 record_full_ops
.to_shortname
= "record-full";
1939 record_full_ops
.to_longname
= "Process record and replay target";
1940 record_full_ops
.to_doc
=
1941 "Log program while executing and replay execution from log.";
1942 record_full_ops
.to_open
= record_full_open
;
1943 record_full_ops
.to_close
= record_full_close
;
1944 record_full_ops
.to_async
= record_full_async
;
1945 record_full_ops
.to_resume
= record_full_resume
;
1946 record_full_ops
.to_commit_resume
= record_full_commit_resume
;
1947 record_full_ops
.to_wait
= record_full_wait
;
1948 record_full_ops
.to_disconnect
= record_disconnect
;
1949 record_full_ops
.to_detach
= record_detach
;
1950 record_full_ops
.to_mourn_inferior
= record_mourn_inferior
;
1951 record_full_ops
.to_kill
= record_kill
;
1952 record_full_ops
.to_store_registers
= record_full_store_registers
;
1953 record_full_ops
.to_xfer_partial
= record_full_xfer_partial
;
1954 record_full_ops
.to_insert_breakpoint
= record_full_insert_breakpoint
;
1955 record_full_ops
.to_remove_breakpoint
= record_full_remove_breakpoint
;
1956 record_full_ops
.to_stopped_by_watchpoint
= record_full_stopped_by_watchpoint
;
1957 record_full_ops
.to_stopped_data_address
= record_full_stopped_data_address
;
1958 record_full_ops
.to_stopped_by_sw_breakpoint
1959 = record_full_stopped_by_sw_breakpoint
;
1960 record_full_ops
.to_supports_stopped_by_sw_breakpoint
1961 = record_full_supports_stopped_by_sw_breakpoint
;
1962 record_full_ops
.to_stopped_by_hw_breakpoint
1963 = record_full_stopped_by_hw_breakpoint
;
1964 record_full_ops
.to_supports_stopped_by_hw_breakpoint
1965 = record_full_supports_stopped_by_hw_breakpoint
;
1966 record_full_ops
.to_can_execute_reverse
= record_full_can_execute_reverse
;
1967 record_full_ops
.to_stratum
= record_stratum
;
1968 /* Add bookmark target methods. */
1969 record_full_ops
.to_get_bookmark
= record_full_get_bookmark
;
1970 record_full_ops
.to_goto_bookmark
= record_full_goto_bookmark
;
1971 record_full_ops
.to_execution_direction
= record_full_execution_direction
;
1972 record_full_ops
.to_record_method
= record_full_record_method
;
1973 record_full_ops
.to_info_record
= record_full_info
;
1974 record_full_ops
.to_save_record
= record_full_save
;
1975 record_full_ops
.to_delete_record
= record_full_delete
;
1976 record_full_ops
.to_record_is_replaying
= record_full_is_replaying
;
1977 record_full_ops
.to_record_will_replay
= record_full_will_replay
;
1978 record_full_ops
.to_record_stop_replaying
= record_full_stop_replaying
;
1979 record_full_ops
.to_goto_record_begin
= record_full_goto_begin
;
1980 record_full_ops
.to_goto_record_end
= record_full_goto_end
;
1981 record_full_ops
.to_goto_record
= record_full_goto
;
1982 record_full_ops
.to_magic
= OPS_MAGIC
;
1985 /* "to_resume" method for prec over corefile. */
1988 record_full_core_resume (struct target_ops
*ops
, ptid_t ptid
, int step
,
1989 enum gdb_signal signal
)
1991 record_full_resume_step
= step
;
1992 record_full_resumed
= 1;
1993 record_full_execution_dir
= execution_direction
;
1995 /* We are about to start executing the inferior (or simulate it),
1996 let's register it with the event loop. */
1997 if (target_can_async_p ())
2001 /* "to_kill" method for prec over corefile. */
2004 record_full_core_kill (struct target_ops
*ops
)
2007 fprintf_unfiltered (gdb_stdlog
, "Process record: record_full_core_kill\n");
2009 unpush_target (&record_full_core_ops
);
2012 /* "to_fetch_registers" method for prec over corefile. */
2015 record_full_core_fetch_registers (struct target_ops
*ops
,
2016 struct regcache
*regcache
,
2021 int num
= gdbarch_num_regs (regcache
->arch ());
2024 for (i
= 0; i
< num
; i
++)
2025 regcache
->raw_supply (i
, *record_full_core_regbuf
);
2028 regcache
->raw_supply (regno
, *record_full_core_regbuf
);
2031 /* "to_prepare_to_store" method for prec over corefile. */
2034 record_full_core_prepare_to_store (struct target_ops
*self
,
2035 struct regcache
*regcache
)
2039 /* "to_store_registers" method for prec over corefile. */
2042 record_full_core_store_registers (struct target_ops
*ops
,
2043 struct regcache
*regcache
,
2046 if (record_full_gdb_operation_disable
)
2047 record_full_core_regbuf
->raw_supply (regno
, *regcache
);
2049 error (_("You can't do that without a process to debug."));
2052 /* "to_xfer_partial" method for prec over corefile. */
2054 static enum target_xfer_status
2055 record_full_core_xfer_partial (struct target_ops
*ops
,
2056 enum target_object object
,
2057 const char *annex
, gdb_byte
*readbuf
,
2058 const gdb_byte
*writebuf
, ULONGEST offset
,
2059 ULONGEST len
, ULONGEST
*xfered_len
)
2061 if (object
== TARGET_OBJECT_MEMORY
)
2063 if (record_full_gdb_operation_disable
|| !writebuf
)
2065 struct target_section
*p
;
2067 for (p
= record_full_core_start
; p
< record_full_core_end
; p
++)
2069 if (offset
>= p
->addr
)
2071 struct record_full_core_buf_entry
*entry
;
2072 ULONGEST sec_offset
;
2074 if (offset
>= p
->endaddr
)
2077 if (offset
+ len
> p
->endaddr
)
2078 len
= p
->endaddr
- offset
;
2080 sec_offset
= offset
- p
->addr
;
2082 /* Read readbuf or write writebuf p, offset, len. */
2084 if (p
->the_bfd_section
->flags
& SEC_CONSTRUCTOR
2085 || (p
->the_bfd_section
->flags
& SEC_HAS_CONTENTS
) == 0)
2088 memset (readbuf
, 0, len
);
2091 return TARGET_XFER_OK
;
2093 /* Get record_full_core_buf_entry. */
2094 for (entry
= record_full_core_buf_list
; entry
;
2095 entry
= entry
->prev
)
2102 /* Add a new entry. */
2103 entry
= XNEW (struct record_full_core_buf_entry
);
2105 if (!bfd_malloc_and_get_section
2106 (p
->the_bfd_section
->owner
,
2111 return TARGET_XFER_EOF
;
2113 entry
->prev
= record_full_core_buf_list
;
2114 record_full_core_buf_list
= entry
;
2117 memcpy (entry
->buf
+ sec_offset
, writebuf
,
2123 return ops
->beneath
->to_xfer_partial (ops
->beneath
,
2129 memcpy (readbuf
, entry
->buf
+ sec_offset
,
2134 return TARGET_XFER_OK
;
2138 return TARGET_XFER_E_IO
;
2141 error (_("You can't do that without a process to debug."));
2144 return ops
->beneath
->to_xfer_partial (ops
->beneath
, object
, annex
,
2145 readbuf
, writebuf
, offset
, len
,
2149 /* "to_insert_breakpoint" method for prec over corefile. */
2152 record_full_core_insert_breakpoint (struct target_ops
*ops
,
2153 struct gdbarch
*gdbarch
,
2154 struct bp_target_info
*bp_tgt
)
2159 /* "to_remove_breakpoint" method for prec over corefile. */
2162 record_full_core_remove_breakpoint (struct target_ops
*ops
,
2163 struct gdbarch
*gdbarch
,
2164 struct bp_target_info
*bp_tgt
,
2165 enum remove_bp_reason reason
)
2170 /* "to_has_execution" method for prec over corefile. */
2173 record_full_core_has_execution (struct target_ops
*ops
, ptid_t the_ptid
)
2179 init_record_full_core_ops (void)
2181 record_full_core_ops
.to_shortname
= "record-core";
2182 record_full_core_ops
.to_longname
= "Process record and replay target";
2183 record_full_core_ops
.to_doc
=
2184 "Log program while executing and replay execution from log.";
2185 record_full_core_ops
.to_open
= record_full_open
;
2186 record_full_core_ops
.to_close
= record_full_close
;
2187 record_full_core_ops
.to_async
= record_full_async
;
2188 record_full_core_ops
.to_resume
= record_full_core_resume
;
2189 record_full_core_ops
.to_wait
= record_full_wait
;
2190 record_full_core_ops
.to_kill
= record_full_core_kill
;
2191 record_full_core_ops
.to_fetch_registers
= record_full_core_fetch_registers
;
2192 record_full_core_ops
.to_prepare_to_store
= record_full_core_prepare_to_store
;
2193 record_full_core_ops
.to_store_registers
= record_full_core_store_registers
;
2194 record_full_core_ops
.to_xfer_partial
= record_full_core_xfer_partial
;
2195 record_full_core_ops
.to_insert_breakpoint
2196 = record_full_core_insert_breakpoint
;
2197 record_full_core_ops
.to_remove_breakpoint
2198 = record_full_core_remove_breakpoint
;
2199 record_full_core_ops
.to_stopped_by_watchpoint
2200 = record_full_stopped_by_watchpoint
;
2201 record_full_core_ops
.to_stopped_data_address
2202 = record_full_stopped_data_address
;
2203 record_full_core_ops
.to_stopped_by_sw_breakpoint
2204 = record_full_stopped_by_sw_breakpoint
;
2205 record_full_core_ops
.to_supports_stopped_by_sw_breakpoint
2206 = record_full_supports_stopped_by_sw_breakpoint
;
2207 record_full_core_ops
.to_stopped_by_hw_breakpoint
2208 = record_full_stopped_by_hw_breakpoint
;
2209 record_full_core_ops
.to_supports_stopped_by_hw_breakpoint
2210 = record_full_supports_stopped_by_hw_breakpoint
;
2211 record_full_core_ops
.to_can_execute_reverse
2212 = record_full_can_execute_reverse
;
2213 record_full_core_ops
.to_has_execution
= record_full_core_has_execution
;
2214 record_full_core_ops
.to_stratum
= record_stratum
;
2215 /* Add bookmark target methods. */
2216 record_full_core_ops
.to_get_bookmark
= record_full_get_bookmark
;
2217 record_full_core_ops
.to_goto_bookmark
= record_full_goto_bookmark
;
2218 record_full_core_ops
.to_execution_direction
2219 = record_full_execution_direction
;
2220 record_full_core_ops
.to_record_method
= record_full_record_method
;
2221 record_full_core_ops
.to_info_record
= record_full_info
;
2222 record_full_core_ops
.to_delete_record
= record_full_delete
;
2223 record_full_core_ops
.to_record_is_replaying
= record_full_is_replaying
;
2224 record_full_core_ops
.to_record_will_replay
= record_full_will_replay
;
2225 record_full_core_ops
.to_goto_record_begin
= record_full_goto_begin
;
2226 record_full_core_ops
.to_goto_record_end
= record_full_goto_end
;
2227 record_full_core_ops
.to_goto_record
= record_full_goto
;
2228 record_full_core_ops
.to_magic
= OPS_MAGIC
;
2231 /* Record log save-file format
2232 Version 1 (never released)
2235 4 bytes: magic number htonl(0x20090829).
2236 NOTE: be sure to change whenever this file format changes!
2240 1 byte: record type (record_full_end, see enum record_full_type).
2242 1 byte: record type (record_full_reg, see enum record_full_type).
2243 8 bytes: register id (network byte order).
2244 MAX_REGISTER_SIZE bytes: register value.
2246 1 byte: record type (record_full_mem, see enum record_full_type).
2247 8 bytes: memory length (network byte order).
2248 8 bytes: memory address (network byte order).
2249 n bytes: memory value (n == memory length).
2252 4 bytes: magic number netorder32(0x20091016).
2253 NOTE: be sure to change whenever this file format changes!
2257 1 byte: record type (record_full_end, see enum record_full_type).
2259 4 bytes: instruction count
2261 1 byte: record type (record_full_reg, see enum record_full_type).
2262 4 bytes: register id (network byte order).
2263 n bytes: register value (n == actual register size).
2264 (eg. 4 bytes for x86 general registers).
2266 1 byte: record type (record_full_mem, see enum record_full_type).
2267 4 bytes: memory length (network byte order).
2268 8 bytes: memory address (network byte order).
2269 n bytes: memory value (n == memory length).
2273 /* bfdcore_read -- read bytes from a core file section. */
2276 bfdcore_read (bfd
*obfd
, asection
*osec
, void *buf
, int len
, int *offset
)
2278 int ret
= bfd_get_section_contents (obfd
, osec
, buf
, *offset
, len
);
2283 error (_("Failed to read %d bytes from core file %s ('%s')."),
2284 len
, bfd_get_filename (obfd
),
2285 bfd_errmsg (bfd_get_error ()));
2288 static inline uint64_t
2289 netorder64 (uint64_t input
)
2293 store_unsigned_integer ((gdb_byte
*) &ret
, sizeof (ret
),
2294 BFD_ENDIAN_BIG
, input
);
2298 static inline uint32_t
2299 netorder32 (uint32_t input
)
2303 store_unsigned_integer ((gdb_byte
*) &ret
, sizeof (ret
),
2304 BFD_ENDIAN_BIG
, input
);
2308 /* Restore the execution log from a core_bfd file. */
2310 record_full_restore (void)
2313 struct cleanup
*old_cleanups
;
2314 struct record_full_entry
*rec
;
2318 struct regcache
*regcache
;
2320 /* We restore the execution log from the open core bfd,
2322 if (core_bfd
== NULL
)
2325 /* "record_full_restore" can only be called when record list is empty. */
2326 gdb_assert (record_full_first
.next
== NULL
);
2329 fprintf_unfiltered (gdb_stdlog
, "Restoring recording from core file.\n");
2331 /* Now need to find our special note section. */
2332 osec
= bfd_get_section_by_name (core_bfd
, "null0");
2334 fprintf_unfiltered (gdb_stdlog
, "Find precord section %s.\n",
2335 osec
? "succeeded" : "failed");
2338 osec_size
= bfd_section_size (core_bfd
, osec
);
2340 fprintf_unfiltered (gdb_stdlog
, "%s", bfd_section_name (core_bfd
, osec
));
2342 /* Check the magic code. */
2343 bfdcore_read (core_bfd
, osec
, &magic
, sizeof (magic
), &bfd_offset
);
2344 if (magic
!= RECORD_FULL_FILE_MAGIC
)
2345 error (_("Version mis-match or file format error in core file %s."),
2346 bfd_get_filename (core_bfd
));
2348 fprintf_unfiltered (gdb_stdlog
,
2349 " Reading 4-byte magic cookie "
2350 "RECORD_FULL_FILE_MAGIC (0x%s)\n",
2351 phex_nz (netorder32 (magic
), 4));
2353 /* Restore the entries in recfd into record_full_arch_list_head and
2354 record_full_arch_list_tail. */
2355 record_full_arch_list_head
= NULL
;
2356 record_full_arch_list_tail
= NULL
;
2357 record_full_insn_num
= 0;
2358 old_cleanups
= make_cleanup (record_full_arch_list_cleanups
, 0);
2359 regcache
= get_current_regcache ();
2364 uint32_t regnum
, len
, signal
, count
;
2367 /* We are finished when offset reaches osec_size. */
2368 if (bfd_offset
>= osec_size
)
2370 bfdcore_read (core_bfd
, osec
, &rectype
, sizeof (rectype
), &bfd_offset
);
2374 case record_full_reg
: /* reg */
2375 /* Get register number to regnum. */
2376 bfdcore_read (core_bfd
, osec
, ®num
,
2377 sizeof (regnum
), &bfd_offset
);
2378 regnum
= netorder32 (regnum
);
2380 rec
= record_full_reg_alloc (regcache
, regnum
);
2383 bfdcore_read (core_bfd
, osec
, record_full_get_loc (rec
),
2384 rec
->u
.reg
.len
, &bfd_offset
);
2387 fprintf_unfiltered (gdb_stdlog
,
2388 " Reading register %d (1 "
2389 "plus %lu plus %d bytes)\n",
2391 (unsigned long) sizeof (regnum
),
2395 case record_full_mem
: /* mem */
2397 bfdcore_read (core_bfd
, osec
, &len
,
2398 sizeof (len
), &bfd_offset
);
2399 len
= netorder32 (len
);
2402 bfdcore_read (core_bfd
, osec
, &addr
,
2403 sizeof (addr
), &bfd_offset
);
2404 addr
= netorder64 (addr
);
2406 rec
= record_full_mem_alloc (addr
, len
);
2409 bfdcore_read (core_bfd
, osec
, record_full_get_loc (rec
),
2410 rec
->u
.mem
.len
, &bfd_offset
);
2413 fprintf_unfiltered (gdb_stdlog
,
2414 " Reading memory %s (1 plus "
2415 "%lu plus %lu plus %d bytes)\n",
2416 paddress (get_current_arch (),
2418 (unsigned long) sizeof (addr
),
2419 (unsigned long) sizeof (len
),
2423 case record_full_end
: /* end */
2424 rec
= record_full_end_alloc ();
2425 record_full_insn_num
++;
2427 /* Get signal value. */
2428 bfdcore_read (core_bfd
, osec
, &signal
,
2429 sizeof (signal
), &bfd_offset
);
2430 signal
= netorder32 (signal
);
2431 rec
->u
.end
.sigval
= (enum gdb_signal
) signal
;
2433 /* Get insn count. */
2434 bfdcore_read (core_bfd
, osec
, &count
,
2435 sizeof (count
), &bfd_offset
);
2436 count
= netorder32 (count
);
2437 rec
->u
.end
.insn_num
= count
;
2438 record_full_insn_count
= count
+ 1;
2440 fprintf_unfiltered (gdb_stdlog
,
2441 " Reading record_full_end (1 + "
2442 "%lu + %lu bytes), offset == %s\n",
2443 (unsigned long) sizeof (signal
),
2444 (unsigned long) sizeof (count
),
2445 paddress (get_current_arch (),
2450 error (_("Bad entry type in core file %s."),
2451 bfd_get_filename (core_bfd
));
2455 /* Add rec to record arch list. */
2456 record_full_arch_list_add (rec
);
2459 discard_cleanups (old_cleanups
);
2461 /* Add record_full_arch_list_head to the end of record list. */
2462 record_full_first
.next
= record_full_arch_list_head
;
2463 record_full_arch_list_head
->prev
= &record_full_first
;
2464 record_full_arch_list_tail
->next
= NULL
;
2465 record_full_list
= &record_full_first
;
2467 /* Update record_full_insn_max_num. */
2468 if (record_full_insn_num
> record_full_insn_max_num
)
2470 record_full_insn_max_num
= record_full_insn_num
;
2471 warning (_("Auto increase record/replay buffer limit to %u."),
2472 record_full_insn_max_num
);
2476 printf_filtered (_("Restored records from core file %s.\n"),
2477 bfd_get_filename (core_bfd
));
2479 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
2482 /* bfdcore_write -- write bytes into a core file section. */
2485 bfdcore_write (bfd
*obfd
, asection
*osec
, void *buf
, int len
, int *offset
)
2487 int ret
= bfd_set_section_contents (obfd
, osec
, buf
, *offset
, len
);
2492 error (_("Failed to write %d bytes to core file %s ('%s')."),
2493 len
, bfd_get_filename (obfd
),
2494 bfd_errmsg (bfd_get_error ()));
2497 /* Restore the execution log from a file. We use a modified elf
2498 corefile format, with an extra section for our data. */
2501 cmd_record_full_restore (const char *args
, int from_tty
)
2503 core_file_command (args
, from_tty
);
2504 record_full_open (args
, from_tty
);
2507 /* Save the execution log to a file. We use a modified elf corefile
2508 format, with an extra section for our data. */
2511 record_full_save (struct target_ops
*self
, const char *recfilename
)
2513 struct record_full_entry
*cur_record_full_list
;
2515 struct regcache
*regcache
;
2516 struct gdbarch
*gdbarch
;
2518 asection
*osec
= NULL
;
2521 /* Open the save file. */
2523 fprintf_unfiltered (gdb_stdlog
, "Saving execution log to core file '%s'\n",
2526 /* Open the output file. */
2527 gdb_bfd_ref_ptr
obfd (create_gcore_bfd (recfilename
));
2529 /* Arrange to remove the output file on failure. */
2530 gdb::unlinker
unlink_file (recfilename
);
2532 /* Save the current record entry to "cur_record_full_list". */
2533 cur_record_full_list
= record_full_list
;
2535 /* Get the values of regcache and gdbarch. */
2536 regcache
= get_current_regcache ();
2537 gdbarch
= regcache
->arch ();
2539 /* Disable the GDB operation record. */
2540 scoped_restore restore_operation_disable
2541 = record_full_gdb_operation_disable_set ();
2543 /* Reverse execute to the begin of record list. */
2546 /* Check for beginning and end of log. */
2547 if (record_full_list
== &record_full_first
)
2550 record_full_exec_insn (regcache
, gdbarch
, record_full_list
);
2552 if (record_full_list
->prev
)
2553 record_full_list
= record_full_list
->prev
;
2556 /* Compute the size needed for the extra bfd section. */
2557 save_size
= 4; /* magic cookie */
2558 for (record_full_list
= record_full_first
.next
; record_full_list
;
2559 record_full_list
= record_full_list
->next
)
2560 switch (record_full_list
->type
)
2562 case record_full_end
:
2563 save_size
+= 1 + 4 + 4;
2565 case record_full_reg
:
2566 save_size
+= 1 + 4 + record_full_list
->u
.reg
.len
;
2568 case record_full_mem
:
2569 save_size
+= 1 + 4 + 8 + record_full_list
->u
.mem
.len
;
2573 /* Make the new bfd section. */
2574 osec
= bfd_make_section_anyway_with_flags (obfd
.get (), "precord",
2578 error (_("Failed to create 'precord' section for corefile %s: %s"),
2580 bfd_errmsg (bfd_get_error ()));
2581 bfd_set_section_size (obfd
.get (), osec
, save_size
);
2582 bfd_set_section_vma (obfd
.get (), osec
, 0);
2583 bfd_set_section_alignment (obfd
.get (), osec
, 0);
2584 bfd_section_lma (obfd
.get (), osec
) = 0;
2586 /* Save corefile state. */
2587 write_gcore_file (obfd
.get ());
2589 /* Write out the record log. */
2590 /* Write the magic code. */
2591 magic
= RECORD_FULL_FILE_MAGIC
;
2593 fprintf_unfiltered (gdb_stdlog
,
2594 " Writing 4-byte magic cookie "
2595 "RECORD_FULL_FILE_MAGIC (0x%s)\n",
2596 phex_nz (magic
, 4));
2597 bfdcore_write (obfd
.get (), osec
, &magic
, sizeof (magic
), &bfd_offset
);
2599 /* Save the entries to recfd and forward execute to the end of
2601 record_full_list
= &record_full_first
;
2605 if (record_full_list
!= &record_full_first
)
2608 uint32_t regnum
, len
, signal
, count
;
2611 type
= record_full_list
->type
;
2612 bfdcore_write (obfd
.get (), osec
, &type
, sizeof (type
), &bfd_offset
);
2614 switch (record_full_list
->type
)
2616 case record_full_reg
: /* reg */
2618 fprintf_unfiltered (gdb_stdlog
,
2619 " Writing register %d (1 "
2620 "plus %lu plus %d bytes)\n",
2621 record_full_list
->u
.reg
.num
,
2622 (unsigned long) sizeof (regnum
),
2623 record_full_list
->u
.reg
.len
);
2626 regnum
= netorder32 (record_full_list
->u
.reg
.num
);
2627 bfdcore_write (obfd
.get (), osec
, ®num
,
2628 sizeof (regnum
), &bfd_offset
);
2631 bfdcore_write (obfd
.get (), osec
,
2632 record_full_get_loc (record_full_list
),
2633 record_full_list
->u
.reg
.len
, &bfd_offset
);
2636 case record_full_mem
: /* mem */
2638 fprintf_unfiltered (gdb_stdlog
,
2639 " Writing memory %s (1 plus "
2640 "%lu plus %lu plus %d bytes)\n",
2642 record_full_list
->u
.mem
.addr
),
2643 (unsigned long) sizeof (addr
),
2644 (unsigned long) sizeof (len
),
2645 record_full_list
->u
.mem
.len
);
2648 len
= netorder32 (record_full_list
->u
.mem
.len
);
2649 bfdcore_write (obfd
.get (), osec
, &len
, sizeof (len
),
2652 /* Write memaddr. */
2653 addr
= netorder64 (record_full_list
->u
.mem
.addr
);
2654 bfdcore_write (obfd
.get (), osec
, &addr
,
2655 sizeof (addr
), &bfd_offset
);
2658 bfdcore_write (obfd
.get (), osec
,
2659 record_full_get_loc (record_full_list
),
2660 record_full_list
->u
.mem
.len
, &bfd_offset
);
2663 case record_full_end
:
2665 fprintf_unfiltered (gdb_stdlog
,
2666 " Writing record_full_end (1 + "
2667 "%lu + %lu bytes)\n",
2668 (unsigned long) sizeof (signal
),
2669 (unsigned long) sizeof (count
));
2670 /* Write signal value. */
2671 signal
= netorder32 (record_full_list
->u
.end
.sigval
);
2672 bfdcore_write (obfd
.get (), osec
, &signal
,
2673 sizeof (signal
), &bfd_offset
);
2675 /* Write insn count. */
2676 count
= netorder32 (record_full_list
->u
.end
.insn_num
);
2677 bfdcore_write (obfd
.get (), osec
, &count
,
2678 sizeof (count
), &bfd_offset
);
2683 /* Execute entry. */
2684 record_full_exec_insn (regcache
, gdbarch
, record_full_list
);
2686 if (record_full_list
->next
)
2687 record_full_list
= record_full_list
->next
;
2692 /* Reverse execute to cur_record_full_list. */
2695 /* Check for beginning and end of log. */
2696 if (record_full_list
== cur_record_full_list
)
2699 record_full_exec_insn (regcache
, gdbarch
, record_full_list
);
2701 if (record_full_list
->prev
)
2702 record_full_list
= record_full_list
->prev
;
2705 unlink_file
.keep ();
2708 printf_filtered (_("Saved core file %s with execution log.\n"),
2712 /* record_full_goto_insn -- rewind the record log (forward or backward,
2713 depending on DIR) to the given entry, changing the program state
2717 record_full_goto_insn (struct record_full_entry
*entry
,
2718 enum exec_direction_kind dir
)
2720 scoped_restore restore_operation_disable
2721 = record_full_gdb_operation_disable_set ();
2722 struct regcache
*regcache
= get_current_regcache ();
2723 struct gdbarch
*gdbarch
= regcache
->arch ();
2725 /* Assume everything is valid: we will hit the entry,
2726 and we will not hit the end of the recording. */
2728 if (dir
== EXEC_FORWARD
)
2729 record_full_list
= record_full_list
->next
;
2733 record_full_exec_insn (regcache
, gdbarch
, record_full_list
);
2734 if (dir
== EXEC_REVERSE
)
2735 record_full_list
= record_full_list
->prev
;
2737 record_full_list
= record_full_list
->next
;
2738 } while (record_full_list
!= entry
);
2741 /* Alias for "target record-full". */
2744 cmd_record_full_start (const char *args
, int from_tty
)
2746 execute_command ("target record-full", from_tty
);
2750 set_record_full_insn_max_num (const char *args
, int from_tty
,
2751 struct cmd_list_element
*c
)
2753 if (record_full_insn_num
> record_full_insn_max_num
)
2755 /* Count down record_full_insn_num while releasing records from list. */
2756 while (record_full_insn_num
> record_full_insn_max_num
)
2758 record_full_list_release_first ();
2759 record_full_insn_num
--;
2764 /* The "set record full" command. */
2767 set_record_full_command (const char *args
, int from_tty
)
2769 printf_unfiltered (_("\"set record full\" must be followed "
2770 "by an appropriate subcommand.\n"));
2771 help_list (set_record_full_cmdlist
, "set record full ", all_commands
,
2775 /* The "show record full" command. */
2778 show_record_full_command (const char *args
, int from_tty
)
2780 cmd_show_list (show_record_full_cmdlist
, from_tty
, "");
2784 _initialize_record_full (void)
2786 struct cmd_list_element
*c
;
2788 /* Init record_full_first. */
2789 record_full_first
.prev
= NULL
;
2790 record_full_first
.next
= NULL
;
2791 record_full_first
.type
= record_full_end
;
2793 init_record_full_ops ();
2794 add_target (&record_full_ops
);
2795 add_deprecated_target_alias (&record_full_ops
, "record");
2796 init_record_full_core_ops ();
2797 add_target (&record_full_core_ops
);
2799 add_prefix_cmd ("full", class_obscure
, cmd_record_full_start
,
2800 _("Start full execution recording."), &record_full_cmdlist
,
2801 "record full ", 0, &record_cmdlist
);
2803 c
= add_cmd ("restore", class_obscure
, cmd_record_full_restore
,
2804 _("Restore the execution log from a file.\n\
2805 Argument is filename. File must be created with 'record save'."),
2806 &record_full_cmdlist
);
2807 set_cmd_completer (c
, filename_completer
);
2809 /* Deprecate the old version without "full" prefix. */
2810 c
= add_alias_cmd ("restore", "full restore", class_obscure
, 1,
2812 set_cmd_completer (c
, filename_completer
);
2813 deprecate_cmd (c
, "record full restore");
2815 add_prefix_cmd ("full", class_support
, set_record_full_command
,
2816 _("Set record options"), &set_record_full_cmdlist
,
2817 "set record full ", 0, &set_record_cmdlist
);
2819 add_prefix_cmd ("full", class_support
, show_record_full_command
,
2820 _("Show record options"), &show_record_full_cmdlist
,
2821 "show record full ", 0, &show_record_cmdlist
);
2823 /* Record instructions number limit command. */
2824 add_setshow_boolean_cmd ("stop-at-limit", no_class
,
2825 &record_full_stop_at_limit
, _("\
2826 Set whether record/replay stops when record/replay buffer becomes full."), _("\
2827 Show whether record/replay stops when record/replay buffer becomes full."),
2828 _("Default is ON.\n\
2829 When ON, if the record/replay buffer becomes full, ask user what to do.\n\
2830 When OFF, if the record/replay buffer becomes full,\n\
2831 delete the oldest recorded instruction to make room for each new one."),
2833 &set_record_full_cmdlist
, &show_record_full_cmdlist
);
2835 c
= add_alias_cmd ("stop-at-limit", "full stop-at-limit", no_class
, 1,
2836 &set_record_cmdlist
);
2837 deprecate_cmd (c
, "set record full stop-at-limit");
2839 c
= add_alias_cmd ("stop-at-limit", "full stop-at-limit", no_class
, 1,
2840 &show_record_cmdlist
);
2841 deprecate_cmd (c
, "show record full stop-at-limit");
2843 add_setshow_uinteger_cmd ("insn-number-max", no_class
,
2844 &record_full_insn_max_num
,
2845 _("Set record/replay buffer limit."),
2846 _("Show record/replay buffer limit."), _("\
2847 Set the maximum number of instructions to be stored in the\n\
2848 record/replay buffer. A value of either \"unlimited\" or zero means no\n\
2849 limit. Default is 200000."),
2850 set_record_full_insn_max_num
,
2851 NULL
, &set_record_full_cmdlist
,
2852 &show_record_full_cmdlist
);
2854 c
= add_alias_cmd ("insn-number-max", "full insn-number-max", no_class
, 1,
2855 &set_record_cmdlist
);
2856 deprecate_cmd (c
, "set record full insn-number-max");
2858 c
= add_alias_cmd ("insn-number-max", "full insn-number-max", no_class
, 1,
2859 &show_record_cmdlist
);
2860 deprecate_cmd (c
, "show record full insn-number-max");
2862 add_setshow_boolean_cmd ("memory-query", no_class
,
2863 &record_full_memory_query
, _("\
2864 Set whether query if PREC cannot record memory change of next instruction."),
2866 Show whether query if PREC cannot record memory change of next instruction."),
2869 When ON, query if PREC cannot record memory change of next instruction."),
2871 &set_record_full_cmdlist
,
2872 &show_record_full_cmdlist
);
2874 c
= add_alias_cmd ("memory-query", "full memory-query", no_class
, 1,
2875 &set_record_cmdlist
);
2876 deprecate_cmd (c
, "set record full memory-query");
2878 c
= add_alias_cmd ("memory-query", "full memory-query", no_class
, 1,
2879 &show_record_cmdlist
);
2880 deprecate_cmd (c
, "show record full memory-query");