1490 lines
40 KiB
C
1490 lines
40 KiB
C
/* Process record and replay target for GDB, the GNU debugger.
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Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcmd.h"
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#include "regcache.h"
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#include "gdbthread.h"
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#include "event-top.h"
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#include "exceptions.h"
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#include "record.h"
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#include <signal.h>
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#define DEFAULT_RECORD_INSN_MAX_NUM 200000
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#define RECORD_IS_REPLAY \
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(record_list->next || execution_direction == EXEC_REVERSE)
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/* These are the core structs of the process record functionality.
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A record_entry is a record of the value change of a register
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("record_reg") or a part of memory ("record_mem"). And each
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instruction must have a struct record_entry ("record_end") that
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indicates that this is the last struct record_entry of this
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instruction.
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Each struct record_entry is linked to "record_list" by "prev" and
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"next" pointers. */
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struct record_mem_entry
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{
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CORE_ADDR addr;
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int len;
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/* Set this flag if target memory for this entry
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can no longer be accessed. */
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int mem_entry_not_accessible;
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union
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{
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gdb_byte *ptr;
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gdb_byte buf[sizeof (gdb_byte *)];
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} u;
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};
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struct record_reg_entry
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{
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unsigned short num;
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unsigned short len;
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union
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{
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gdb_byte *ptr;
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gdb_byte buf[2 * sizeof (gdb_byte *)];
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} u;
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};
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struct record_end_entry
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{
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enum target_signal sigval;
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};
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enum record_type
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{
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record_end = 0,
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record_reg,
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record_mem
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};
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struct record_entry
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{
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struct record_entry *prev;
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struct record_entry *next;
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enum record_type type;
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union
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{
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/* reg */
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struct record_reg_entry reg;
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/* mem */
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struct record_mem_entry mem;
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/* end */
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struct record_end_entry end;
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} u;
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};
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/* This is the debug switch for process record. */
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int record_debug = 0;
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/* These list is for execution log. */
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static struct record_entry record_first;
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static struct record_entry *record_list = &record_first;
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static struct record_entry *record_arch_list_head = NULL;
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static struct record_entry *record_arch_list_tail = NULL;
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/* 1 ask user. 0 auto delete the last struct record_entry. */
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static int record_stop_at_limit = 1;
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static unsigned int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM;
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static int record_insn_num = 0;
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/* The target_ops of process record. */
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static struct target_ops record_ops;
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/* The beneath function pointers. */
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static struct target_ops *record_beneath_to_resume_ops;
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static void (*record_beneath_to_resume) (struct target_ops *, ptid_t, int,
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enum target_signal);
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static struct target_ops *record_beneath_to_wait_ops;
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static ptid_t (*record_beneath_to_wait) (struct target_ops *, ptid_t,
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struct target_waitstatus *,
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int);
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static struct target_ops *record_beneath_to_store_registers_ops;
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static void (*record_beneath_to_store_registers) (struct target_ops *,
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struct regcache *,
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int regno);
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static struct target_ops *record_beneath_to_xfer_partial_ops;
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static LONGEST (*record_beneath_to_xfer_partial) (struct target_ops *ops,
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enum target_object object,
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const char *annex,
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gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset,
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LONGEST len);
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static int (*record_beneath_to_insert_breakpoint) (struct gdbarch *,
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struct bp_target_info *);
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static int (*record_beneath_to_remove_breakpoint) (struct gdbarch *,
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struct bp_target_info *);
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/* Alloc and free functions for record_reg, record_mem, and record_end
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entries. */
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/* Alloc a record_reg record entry. */
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static inline struct record_entry *
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record_reg_alloc (struct regcache *regcache, int regnum)
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{
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struct record_entry *rec;
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry));
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rec->type = record_reg;
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rec->u.reg.num = regnum;
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rec->u.reg.len = register_size (gdbarch, regnum);
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if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
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rec->u.reg.u.ptr = (gdb_byte *) xmalloc (rec->u.reg.len);
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return rec;
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}
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/* Free a record_reg record entry. */
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static inline void
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record_reg_release (struct record_entry *rec)
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{
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gdb_assert (rec->type == record_reg);
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if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
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xfree (rec->u.reg.u.ptr);
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xfree (rec);
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}
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/* Alloc a record_mem record entry. */
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static inline struct record_entry *
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record_mem_alloc (CORE_ADDR addr, int len)
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{
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struct record_entry *rec;
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rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry));
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rec->type = record_mem;
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rec->u.mem.addr = addr;
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rec->u.mem.len = len;
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if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
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rec->u.mem.u.ptr = (gdb_byte *) xmalloc (len);
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return rec;
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}
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/* Free a record_mem record entry. */
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static inline void
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record_mem_release (struct record_entry *rec)
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{
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gdb_assert (rec->type == record_mem);
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if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
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xfree (rec->u.mem.u.ptr);
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xfree (rec);
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}
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/* Alloc a record_end record entry. */
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static inline struct record_entry *
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record_end_alloc (void)
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{
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struct record_entry *rec;
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rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry));
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rec->type = record_end;
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return rec;
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}
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/* Free a record_end record entry. */
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static inline void
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record_end_release (struct record_entry *rec)
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{
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xfree (rec);
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}
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/* Free one record entry, any type.
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Return entry->type, in case caller wants to know. */
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static inline enum record_type
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record_entry_release (struct record_entry *rec)
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{
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enum record_type type = rec->type;
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switch (type) {
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case record_reg:
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record_reg_release (rec);
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break;
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case record_mem:
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record_mem_release (rec);
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break;
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case record_end:
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record_end_release (rec);
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break;
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}
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return type;
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}
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/* Free all record entries in list pointed to by REC. */
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static void
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record_list_release (struct record_entry *rec)
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{
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if (!rec)
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return;
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while (rec->next)
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rec = rec->next;
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while (rec->prev)
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{
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rec = rec->prev;
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record_entry_release (rec->next);
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}
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if (rec == &record_first)
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{
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record_insn_num = 0;
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record_first.next = NULL;
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}
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else
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record_entry_release (rec);
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}
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/* Free all record entries forward of the given list position. */
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static void
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record_list_release_following (struct record_entry *rec)
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{
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struct record_entry *tmp = rec->next;
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rec->next = NULL;
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while (tmp)
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{
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rec = tmp->next;
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if (record_entry_release (tmp) == record_end)
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record_insn_num--;
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tmp = rec;
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}
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}
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/* Delete the first instruction from the beginning of the log, to make
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room for adding a new instruction at the end of the log.
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Note -- this function does not modify record_insn_num. */
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static void
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record_list_release_first (void)
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{
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struct record_entry *tmp;
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if (!record_first.next)
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return;
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/* Loop until a record_end. */
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while (1)
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{
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/* Cut record_first.next out of the linked list. */
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tmp = record_first.next;
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record_first.next = tmp->next;
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tmp->next->prev = &record_first;
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/* tmp is now isolated, and can be deleted. */
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if (record_entry_release (tmp) == record_end)
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{
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record_insn_num--;
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break; /* End loop at first record_end. */
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}
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if (!record_first.next)
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{
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gdb_assert (record_insn_num == 1);
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break; /* End loop when list is empty. */
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}
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}
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}
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/* Add a struct record_entry to record_arch_list. */
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static void
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record_arch_list_add (struct record_entry *rec)
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{
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if (record_debug > 1)
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fprintf_unfiltered (gdb_stdlog,
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"Process record: record_arch_list_add %s.\n",
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host_address_to_string (rec));
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if (record_arch_list_tail)
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{
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record_arch_list_tail->next = rec;
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rec->prev = record_arch_list_tail;
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record_arch_list_tail = rec;
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}
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else
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{
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record_arch_list_head = rec;
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record_arch_list_tail = rec;
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}
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}
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/* Return the value storage location of a record entry. */
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static inline gdb_byte *
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record_get_loc (struct record_entry *rec)
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{
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switch (rec->type) {
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case record_mem:
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if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
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return rec->u.mem.u.ptr;
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else
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return rec->u.mem.u.buf;
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case record_reg:
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if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
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return rec->u.reg.u.ptr;
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else
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return rec->u.reg.u.buf;
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case record_end:
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default:
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gdb_assert (0);
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return NULL;
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}
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}
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/* Record the value of a register NUM to record_arch_list. */
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int
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record_arch_list_add_reg (struct regcache *regcache, int regnum)
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{
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struct record_entry *rec;
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if (record_debug > 1)
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fprintf_unfiltered (gdb_stdlog,
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"Process record: add register num = %d to "
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"record list.\n",
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regnum);
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rec = record_reg_alloc (regcache, regnum);
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regcache_raw_read (regcache, regnum, record_get_loc (rec));
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record_arch_list_add (rec);
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return 0;
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}
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/* Record the value of a region of memory whose address is ADDR and
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length is LEN to record_arch_list. */
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int
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record_arch_list_add_mem (CORE_ADDR addr, int len)
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{
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struct record_entry *rec;
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if (record_debug > 1)
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fprintf_unfiltered (gdb_stdlog,
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"Process record: add mem addr = %s len = %d to "
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"record list.\n",
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paddress (target_gdbarch, addr), len);
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if (!addr) /* FIXME: Why? Some arch must permit it... */
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return 0;
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rec = record_mem_alloc (addr, len);
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if (target_read_memory (addr, record_get_loc (rec), len))
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{
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if (record_debug)
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fprintf_unfiltered (gdb_stdlog,
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"Process record: error reading memory at "
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"addr = %s len = %d.\n",
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paddress (target_gdbarch, addr), len);
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record_mem_release (rec);
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return -1;
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}
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record_arch_list_add (rec);
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return 0;
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}
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/* Add a record_end type struct record_entry to record_arch_list. */
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int
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record_arch_list_add_end (void)
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{
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struct record_entry *rec;
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if (record_debug > 1)
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fprintf_unfiltered (gdb_stdlog,
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"Process record: add end to arch list.\n");
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rec = record_end_alloc ();
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rec->u.end.sigval = TARGET_SIGNAL_0;
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record_arch_list_add (rec);
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return 0;
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}
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static void
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record_check_insn_num (int set_terminal)
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{
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if (record_insn_max_num)
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{
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gdb_assert (record_insn_num <= record_insn_max_num);
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if (record_insn_num == record_insn_max_num)
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{
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/* Ask user what to do. */
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if (record_stop_at_limit)
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{
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int q;
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if (set_terminal)
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target_terminal_ours ();
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q = yquery (_("Do you want to auto delete previous execution "
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"log entries when record/replay buffer becomes "
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"full (record stop-at-limit)?"));
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if (set_terminal)
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target_terminal_inferior ();
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if (q)
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record_stop_at_limit = 0;
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else
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error (_("Process record: inferior program stopped."));
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}
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}
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}
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}
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/* Before inferior step (when GDB record the running message, inferior
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only can step), GDB will call this function to record the values to
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record_list. This function will call gdbarch_process_record to
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record the running message of inferior and set them to
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record_arch_list, and add it to record_list. */
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static void
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record_message_cleanups (void *ignore)
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{
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record_list_release (record_arch_list_tail);
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}
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struct record_message_args {
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struct regcache *regcache;
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enum target_signal signal;
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};
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static int
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record_message (void *args)
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{
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int ret;
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struct record_message_args *myargs = args;
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struct gdbarch *gdbarch = get_regcache_arch (myargs->regcache);
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struct cleanup *old_cleanups = make_cleanup (record_message_cleanups, 0);
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record_arch_list_head = NULL;
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record_arch_list_tail = NULL;
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/* Check record_insn_num. */
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record_check_insn_num (1);
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/* If gdb sends a signal value to target_resume,
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save it in the 'end' field of the previous instruction.
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Maybe process record should record what really happened,
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rather than what gdb pretends has happened.
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So if Linux delivered the signal to the child process during
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the record mode, we will record it and deliver it again in
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the replay mode.
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If user says "ignore this signal" during the record mode, then
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it will be ignored again during the replay mode (no matter if
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the user says something different, like "deliver this signal"
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during the replay mode).
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User should understand that nothing he does during the replay
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mode will change the behavior of the child. If he tries,
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then that is a user error.
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But we should still deliver the signal to gdb during the replay,
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if we delivered it during the recording. Therefore we should
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record the signal during record_wait, not record_resume. */
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if (record_list != &record_first) /* FIXME better way to check */
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{
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gdb_assert (record_list->type == record_end);
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record_list->u.end.sigval = myargs->signal;
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}
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if (myargs->signal == TARGET_SIGNAL_0
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|| !gdbarch_process_record_signal_p (gdbarch))
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ret = gdbarch_process_record (gdbarch,
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myargs->regcache,
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regcache_read_pc (myargs->regcache));
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else
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ret = gdbarch_process_record_signal (gdbarch,
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myargs->regcache,
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myargs->signal);
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if (ret > 0)
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error (_("Process record: inferior program stopped."));
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if (ret < 0)
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error (_("Process record: failed to record execution log."));
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discard_cleanups (old_cleanups);
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record_list->next = record_arch_list_head;
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record_arch_list_head->prev = record_list;
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record_list = record_arch_list_tail;
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if (record_insn_num == record_insn_max_num && record_insn_max_num)
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record_list_release_first ();
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else
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record_insn_num++;
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return 1;
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}
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static int
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do_record_message (struct regcache *regcache,
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enum target_signal signal)
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{
|
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struct record_message_args args;
|
|
|
|
args.regcache = regcache;
|
|
args.signal = signal;
|
|
return catch_errors (record_message, &args, NULL, RETURN_MASK_ALL);
|
|
}
|
|
|
|
/* Set to 1 if record_store_registers and record_xfer_partial
|
|
doesn't need record. */
|
|
|
|
static int record_gdb_operation_disable = 0;
|
|
|
|
struct cleanup *
|
|
record_gdb_operation_disable_set (void)
|
|
{
|
|
struct cleanup *old_cleanups = NULL;
|
|
|
|
old_cleanups =
|
|
make_cleanup_restore_integer (&record_gdb_operation_disable);
|
|
record_gdb_operation_disable = 1;
|
|
|
|
return old_cleanups;
|
|
}
|
|
|
|
static void
|
|
record_open (char *name, int from_tty)
|
|
{
|
|
struct target_ops *t;
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n");
|
|
|
|
/* check exec */
|
|
if (!target_has_execution)
|
|
error (_("Process record: the program is not being run."));
|
|
if (non_stop)
|
|
error (_("Process record target can't debug inferior in non-stop mode "
|
|
"(non-stop)."));
|
|
if (target_async_permitted)
|
|
error (_("Process record target can't debug inferior in asynchronous "
|
|
"mode (target-async)."));
|
|
|
|
if (!gdbarch_process_record_p (target_gdbarch))
|
|
error (_("Process record: the current architecture doesn't support "
|
|
"record function."));
|
|
|
|
/* Check if record target is already running. */
|
|
if (current_target.to_stratum == record_stratum)
|
|
error (_("Process record target already running. Use \"record stop\" to "
|
|
"stop record target first."));
|
|
|
|
/*Reset the beneath function pointers. */
|
|
record_beneath_to_resume = NULL;
|
|
record_beneath_to_wait = NULL;
|
|
record_beneath_to_store_registers = NULL;
|
|
record_beneath_to_xfer_partial = NULL;
|
|
record_beneath_to_insert_breakpoint = NULL;
|
|
record_beneath_to_remove_breakpoint = NULL;
|
|
|
|
/* Set the beneath function pointers. */
|
|
for (t = current_target.beneath; t != NULL; t = t->beneath)
|
|
{
|
|
if (!record_beneath_to_resume)
|
|
{
|
|
record_beneath_to_resume = t->to_resume;
|
|
record_beneath_to_resume_ops = t;
|
|
}
|
|
if (!record_beneath_to_wait)
|
|
{
|
|
record_beneath_to_wait = t->to_wait;
|
|
record_beneath_to_wait_ops = t;
|
|
}
|
|
if (!record_beneath_to_store_registers)
|
|
{
|
|
record_beneath_to_store_registers = t->to_store_registers;
|
|
record_beneath_to_store_registers_ops = t;
|
|
}
|
|
if (!record_beneath_to_xfer_partial)
|
|
{
|
|
record_beneath_to_xfer_partial = t->to_xfer_partial;
|
|
record_beneath_to_xfer_partial_ops = t;
|
|
}
|
|
if (!record_beneath_to_insert_breakpoint)
|
|
record_beneath_to_insert_breakpoint = t->to_insert_breakpoint;
|
|
if (!record_beneath_to_remove_breakpoint)
|
|
record_beneath_to_remove_breakpoint = t->to_remove_breakpoint;
|
|
}
|
|
if (!record_beneath_to_resume)
|
|
error (_("Process record can't get to_resume."));
|
|
if (!record_beneath_to_wait)
|
|
error (_("Process record can't get to_wait."));
|
|
if (!record_beneath_to_store_registers)
|
|
error (_("Process record can't get to_store_registers."));
|
|
if (!record_beneath_to_xfer_partial)
|
|
error (_("Process record can't get to_xfer_partial."));
|
|
if (!record_beneath_to_insert_breakpoint)
|
|
error (_("Process record can't get to_insert_breakpoint."));
|
|
if (!record_beneath_to_remove_breakpoint)
|
|
error (_("Process record can't get to_remove_breakpoint."));
|
|
|
|
push_target (&record_ops);
|
|
|
|
/* Reset */
|
|
record_insn_num = 0;
|
|
record_list = &record_first;
|
|
record_list->next = NULL;
|
|
}
|
|
|
|
static void
|
|
record_close (int quitting)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_close\n");
|
|
|
|
record_list_release (record_list);
|
|
}
|
|
|
|
static int record_resume_step = 0;
|
|
static int record_resume_error;
|
|
|
|
static void
|
|
record_resume (struct target_ops *ops, ptid_t ptid, int step,
|
|
enum target_signal signal)
|
|
{
|
|
record_resume_step = step;
|
|
|
|
if (!RECORD_IS_REPLAY)
|
|
{
|
|
if (do_record_message (get_current_regcache (), signal))
|
|
{
|
|
record_resume_error = 0;
|
|
}
|
|
else
|
|
{
|
|
record_resume_error = 1;
|
|
return;
|
|
}
|
|
record_beneath_to_resume (record_beneath_to_resume_ops, ptid, 1,
|
|
signal);
|
|
}
|
|
}
|
|
|
|
static int record_get_sig = 0;
|
|
|
|
static void
|
|
record_sig_handler (int signo)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: get a signal\n");
|
|
|
|
/* It will break the running inferior in replay mode. */
|
|
record_resume_step = 1;
|
|
|
|
/* It will let record_wait set inferior status to get the signal
|
|
SIGINT. */
|
|
record_get_sig = 1;
|
|
}
|
|
|
|
static void
|
|
record_wait_cleanups (void *ignore)
|
|
{
|
|
if (execution_direction == EXEC_REVERSE)
|
|
{
|
|
if (record_list->next)
|
|
record_list = record_list->next;
|
|
}
|
|
else
|
|
record_list = record_list->prev;
|
|
}
|
|
|
|
/* In replay mode, this function examines the recorded log and
|
|
determines where to stop. */
|
|
|
|
static ptid_t
|
|
record_wait (struct target_ops *ops,
|
|
ptid_t ptid, struct target_waitstatus *status,
|
|
int options)
|
|
{
|
|
struct cleanup *set_cleanups = record_gdb_operation_disable_set ();
|
|
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_wait "
|
|
"record_resume_step = %d\n",
|
|
record_resume_step);
|
|
|
|
if (!RECORD_IS_REPLAY)
|
|
{
|
|
if (record_resume_error)
|
|
{
|
|
/* If record_resume get error, return directly. */
|
|
status->kind = TARGET_WAITKIND_STOPPED;
|
|
status->value.sig = TARGET_SIGNAL_ABRT;
|
|
return inferior_ptid;
|
|
}
|
|
|
|
if (record_resume_step)
|
|
{
|
|
/* This is a single step. */
|
|
return record_beneath_to_wait (record_beneath_to_wait_ops,
|
|
ptid, status, options);
|
|
}
|
|
else
|
|
{
|
|
/* This is not a single step. */
|
|
ptid_t ret;
|
|
CORE_ADDR tmp_pc;
|
|
|
|
while (1)
|
|
{
|
|
ret = record_beneath_to_wait (record_beneath_to_wait_ops,
|
|
ptid, status, options);
|
|
|
|
/* Is this a SIGTRAP? */
|
|
if (status->kind == TARGET_WAITKIND_STOPPED
|
|
&& status->value.sig == TARGET_SIGNAL_TRAP)
|
|
{
|
|
/* Yes -- check if there is a breakpoint. */
|
|
registers_changed ();
|
|
tmp_pc = regcache_read_pc (get_current_regcache ());
|
|
if (breakpoint_inserted_here_p (tmp_pc))
|
|
{
|
|
/* There is a breakpoint. GDB will want to stop. */
|
|
CORE_ADDR decr_pc_after_break =
|
|
gdbarch_decr_pc_after_break
|
|
(get_regcache_arch (get_current_regcache ()));
|
|
if (decr_pc_after_break)
|
|
{
|
|
regcache_write_pc (get_thread_regcache (ret),
|
|
tmp_pc + decr_pc_after_break);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* There is not a breakpoint, and gdb is not
|
|
stepping, therefore gdb will not stop.
|
|
Therefore we will not return to gdb.
|
|
Record the insn and resume. */
|
|
if (!do_record_message (get_current_regcache (),
|
|
TARGET_SIGNAL_0))
|
|
{
|
|
break;
|
|
}
|
|
record_beneath_to_resume (record_beneath_to_resume_ops,
|
|
ptid, 1,
|
|
TARGET_SIGNAL_0);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* The inferior is broken by a breakpoint or a signal. */
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
struct regcache *regcache = get_current_regcache ();
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
int continue_flag = 1;
|
|
int first_record_end = 1;
|
|
struct cleanup *old_cleanups = make_cleanup (record_wait_cleanups, 0);
|
|
CORE_ADDR tmp_pc;
|
|
|
|
status->kind = TARGET_WAITKIND_STOPPED;
|
|
|
|
/* Check breakpoint when forward execute. */
|
|
if (execution_direction == EXEC_FORWARD)
|
|
{
|
|
tmp_pc = regcache_read_pc (regcache);
|
|
if (breakpoint_inserted_here_p (tmp_pc))
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: break at %s.\n",
|
|
paddress (gdbarch, tmp_pc));
|
|
if (gdbarch_decr_pc_after_break (gdbarch)
|
|
&& !record_resume_step)
|
|
regcache_write_pc (regcache,
|
|
tmp_pc +
|
|
gdbarch_decr_pc_after_break (gdbarch));
|
|
goto replay_out;
|
|
}
|
|
}
|
|
|
|
record_get_sig = 0;
|
|
signal (SIGINT, record_sig_handler);
|
|
/* If GDB is in terminal_inferior mode, it will not get the signal.
|
|
And in GDB replay mode, GDB doesn't need to be in terminal_inferior
|
|
mode, because inferior will not executed.
|
|
Then set it to terminal_ours to make GDB get the signal. */
|
|
target_terminal_ours ();
|
|
|
|
/* In EXEC_FORWARD mode, record_list points to the tail of prev
|
|
instruction. */
|
|
if (execution_direction == EXEC_FORWARD && record_list->next)
|
|
record_list = record_list->next;
|
|
|
|
/* Loop over the record_list, looking for the next place to
|
|
stop. */
|
|
do
|
|
{
|
|
/* Check for beginning and end of log. */
|
|
if (execution_direction == EXEC_REVERSE
|
|
&& record_list == &record_first)
|
|
{
|
|
/* Hit beginning of record log in reverse. */
|
|
status->kind = TARGET_WAITKIND_NO_HISTORY;
|
|
break;
|
|
}
|
|
if (execution_direction != EXEC_REVERSE && !record_list->next)
|
|
{
|
|
/* Hit end of record log going forward. */
|
|
status->kind = TARGET_WAITKIND_NO_HISTORY;
|
|
break;
|
|
}
|
|
|
|
/* Set ptid, register and memory according to record_list. */
|
|
if (record_list->type == record_reg)
|
|
{
|
|
/* reg */
|
|
gdb_byte reg[MAX_REGISTER_SIZE];
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_reg %s to "
|
|
"inferior num = %d.\n",
|
|
host_address_to_string (record_list),
|
|
record_list->u.reg.num);
|
|
regcache_cooked_read (regcache, record_list->u.reg.num, reg);
|
|
regcache_cooked_write (regcache, record_list->u.reg.num,
|
|
record_get_loc (record_list));
|
|
memcpy (record_get_loc (record_list), reg,
|
|
record_list->u.reg.len);
|
|
}
|
|
else if (record_list->type == record_mem)
|
|
{
|
|
/* mem */
|
|
/* Nothing to do if the entry is flagged not_accessible. */
|
|
if (!record_list->u.mem.mem_entry_not_accessible)
|
|
{
|
|
gdb_byte *mem = alloca (record_list->u.mem.len);
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_mem %s to "
|
|
"inferior addr = %s len = %d.\n",
|
|
host_address_to_string (record_list),
|
|
paddress (gdbarch,
|
|
record_list->u.mem.addr),
|
|
record_list->u.mem.len);
|
|
|
|
if (target_read_memory (record_list->u.mem.addr, mem,
|
|
record_list->u.mem.len))
|
|
{
|
|
if (execution_direction != EXEC_REVERSE)
|
|
error (_("Process record: error reading memory at "
|
|
"addr = %s len = %d."),
|
|
paddress (gdbarch, record_list->u.mem.addr),
|
|
record_list->u.mem.len);
|
|
else
|
|
/* Read failed --
|
|
flag entry as not_accessible. */
|
|
record_list->u.mem.mem_entry_not_accessible = 1;
|
|
}
|
|
else
|
|
{
|
|
if (target_write_memory (record_list->u.mem.addr,
|
|
record_get_loc (record_list),
|
|
record_list->u.mem.len))
|
|
{
|
|
if (execution_direction != EXEC_REVERSE)
|
|
error (_("Process record: error writing memory at "
|
|
"addr = %s len = %d."),
|
|
paddress (gdbarch, record_list->u.mem.addr),
|
|
record_list->u.mem.len);
|
|
else
|
|
/* Write failed --
|
|
flag entry as not_accessible. */
|
|
record_list->u.mem.mem_entry_not_accessible = 1;
|
|
}
|
|
else
|
|
{
|
|
memcpy (record_get_loc (record_list), mem,
|
|
record_list->u.mem.len);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: record_end %s to "
|
|
"inferior.\n",
|
|
host_address_to_string (record_list));
|
|
|
|
if (first_record_end && execution_direction == EXEC_REVERSE)
|
|
{
|
|
/* When reverse excute, the first record_end is the part of
|
|
current instruction. */
|
|
first_record_end = 0;
|
|
}
|
|
else
|
|
{
|
|
/* In EXEC_REVERSE mode, this is the record_end of prev
|
|
instruction.
|
|
In EXEC_FORWARD mode, this is the record_end of current
|
|
instruction. */
|
|
/* step */
|
|
if (record_resume_step)
|
|
{
|
|
if (record_debug > 1)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: step.\n");
|
|
continue_flag = 0;
|
|
}
|
|
|
|
/* check breakpoint */
|
|
tmp_pc = regcache_read_pc (regcache);
|
|
if (breakpoint_inserted_here_p (tmp_pc))
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Process record: break "
|
|
"at %s.\n",
|
|
paddress (gdbarch, tmp_pc));
|
|
if (gdbarch_decr_pc_after_break (gdbarch)
|
|
&& execution_direction == EXEC_FORWARD
|
|
&& !record_resume_step)
|
|
regcache_write_pc (regcache,
|
|
tmp_pc +
|
|
gdbarch_decr_pc_after_break (gdbarch));
|
|
continue_flag = 0;
|
|
}
|
|
/* Check target signal */
|
|
if (record_list->u.end.sigval != TARGET_SIGNAL_0)
|
|
/* FIXME: better way to check */
|
|
continue_flag = 0;
|
|
}
|
|
}
|
|
|
|
if (continue_flag)
|
|
{
|
|
if (execution_direction == EXEC_REVERSE)
|
|
{
|
|
if (record_list->prev)
|
|
record_list = record_list->prev;
|
|
}
|
|
else
|
|
{
|
|
if (record_list->next)
|
|
record_list = record_list->next;
|
|
}
|
|
}
|
|
}
|
|
while (continue_flag);
|
|
|
|
signal (SIGINT, handle_sigint);
|
|
|
|
replay_out:
|
|
if (record_get_sig)
|
|
status->value.sig = TARGET_SIGNAL_INT;
|
|
else if (record_list->u.end.sigval != TARGET_SIGNAL_0)
|
|
/* FIXME: better way to check */
|
|
status->value.sig = record_list->u.end.sigval;
|
|
else
|
|
status->value.sig = TARGET_SIGNAL_TRAP;
|
|
|
|
discard_cleanups (old_cleanups);
|
|
}
|
|
|
|
do_cleanups (set_cleanups);
|
|
return inferior_ptid;
|
|
}
|
|
|
|
static void
|
|
record_disconnect (struct target_ops *target, char *args, int from_tty)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_disconnect\n");
|
|
|
|
unpush_target (&record_ops);
|
|
target_disconnect (args, from_tty);
|
|
}
|
|
|
|
static void
|
|
record_detach (struct target_ops *ops, char *args, int from_tty)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_detach\n");
|
|
|
|
unpush_target (&record_ops);
|
|
target_detach (args, from_tty);
|
|
}
|
|
|
|
static void
|
|
record_mourn_inferior (struct target_ops *ops)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: "
|
|
"record_mourn_inferior\n");
|
|
|
|
unpush_target (&record_ops);
|
|
target_mourn_inferior ();
|
|
}
|
|
|
|
/* Close process record target before killing the inferior process. */
|
|
|
|
static void
|
|
record_kill (struct target_ops *ops)
|
|
{
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog, "Process record: record_kill\n");
|
|
|
|
unpush_target (&record_ops);
|
|
target_kill ();
|
|
}
|
|
|
|
/* Record registers change (by user or by GDB) to list as an instruction. */
|
|
|
|
static void
|
|
record_registers_change (struct regcache *regcache, int regnum)
|
|
{
|
|
/* Check record_insn_num. */
|
|
record_check_insn_num (0);
|
|
|
|
record_arch_list_head = NULL;
|
|
record_arch_list_tail = NULL;
|
|
|
|
if (regnum < 0)
|
|
{
|
|
int i;
|
|
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
|
|
{
|
|
if (record_arch_list_add_reg (regcache, i))
|
|
{
|
|
record_list_release (record_arch_list_tail);
|
|
error (_("Process record: failed to record execution log."));
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (record_arch_list_add_reg (regcache, regnum))
|
|
{
|
|
record_list_release (record_arch_list_tail);
|
|
error (_("Process record: failed to record execution log."));
|
|
}
|
|
}
|
|
if (record_arch_list_add_end ())
|
|
{
|
|
record_list_release (record_arch_list_tail);
|
|
error (_("Process record: failed to record execution log."));
|
|
}
|
|
record_list->next = record_arch_list_head;
|
|
record_arch_list_head->prev = record_list;
|
|
record_list = record_arch_list_tail;
|
|
|
|
if (record_insn_num == record_insn_max_num && record_insn_max_num)
|
|
record_list_release_first ();
|
|
else
|
|
record_insn_num++;
|
|
}
|
|
|
|
static void
|
|
record_store_registers (struct target_ops *ops, struct regcache *regcache,
|
|
int regno)
|
|
{
|
|
if (!record_gdb_operation_disable)
|
|
{
|
|
if (RECORD_IS_REPLAY)
|
|
{
|
|
int n;
|
|
|
|
/* Let user choose if he wants to write register or not. */
|
|
if (regno < 0)
|
|
n =
|
|
query (_("Because GDB is in replay mode, changing the "
|
|
"value of a register will make the execution "
|
|
"log unusable from this point onward. "
|
|
"Change all registers?"));
|
|
else
|
|
n =
|
|
query (_("Because GDB is in replay mode, changing the value "
|
|
"of a register will make the execution log unusable "
|
|
"from this point onward. Change register %s?"),
|
|
gdbarch_register_name (get_regcache_arch (regcache),
|
|
regno));
|
|
|
|
if (!n)
|
|
{
|
|
/* Invalidate the value of regcache that was set in function
|
|
"regcache_raw_write". */
|
|
if (regno < 0)
|
|
{
|
|
int i;
|
|
for (i = 0;
|
|
i < gdbarch_num_regs (get_regcache_arch (regcache));
|
|
i++)
|
|
regcache_invalidate (regcache, i);
|
|
}
|
|
else
|
|
regcache_invalidate (regcache, regno);
|
|
|
|
error (_("Process record canceled the operation."));
|
|
}
|
|
|
|
/* Destroy the record from here forward. */
|
|
record_list_release_following (record_list);
|
|
}
|
|
|
|
record_registers_change (regcache, regno);
|
|
}
|
|
record_beneath_to_store_registers (record_beneath_to_store_registers_ops,
|
|
regcache, regno);
|
|
}
|
|
|
|
/* Behavior is conditional on RECORD_IS_REPLAY.
|
|
In replay mode, we cannot write memory unles we are willing to
|
|
invalidate the record/replay log from this point forward. */
|
|
|
|
static LONGEST
|
|
record_xfer_partial (struct target_ops *ops, enum target_object object,
|
|
const char *annex, gdb_byte *readbuf,
|
|
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
|
|
{
|
|
if (!record_gdb_operation_disable
|
|
&& (object == TARGET_OBJECT_MEMORY
|
|
|| object == TARGET_OBJECT_RAW_MEMORY) && writebuf)
|
|
{
|
|
if (RECORD_IS_REPLAY)
|
|
{
|
|
/* Let user choose if he wants to write memory or not. */
|
|
if (!query (_("Because GDB is in replay mode, writing to memory "
|
|
"will make the execution log unusable from this "
|
|
"point onward. Write memory at address %s?"),
|
|
paddress (target_gdbarch, offset)))
|
|
error (_("Process record canceled the operation."));
|
|
|
|
/* Destroy the record from here forward. */
|
|
record_list_release_following (record_list);
|
|
}
|
|
|
|
/* Check record_insn_num */
|
|
record_check_insn_num (0);
|
|
|
|
/* Record registers change to list as an instruction. */
|
|
record_arch_list_head = NULL;
|
|
record_arch_list_tail = NULL;
|
|
if (record_arch_list_add_mem (offset, len))
|
|
{
|
|
record_list_release (record_arch_list_tail);
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
_("Process record: failed to record "
|
|
"execution log."));
|
|
return -1;
|
|
}
|
|
if (record_arch_list_add_end ())
|
|
{
|
|
record_list_release (record_arch_list_tail);
|
|
if (record_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
_("Process record: failed to record "
|
|
"execution log."));
|
|
return -1;
|
|
}
|
|
record_list->next = record_arch_list_head;
|
|
record_arch_list_head->prev = record_list;
|
|
record_list = record_arch_list_tail;
|
|
|
|
if (record_insn_num == record_insn_max_num && record_insn_max_num)
|
|
record_list_release_first ();
|
|
else
|
|
record_insn_num++;
|
|
}
|
|
|
|
return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops,
|
|
object, annex, readbuf, writebuf,
|
|
offset, len);
|
|
}
|
|
|
|
/* Behavior is conditional on RECORD_IS_REPLAY.
|
|
We will not actually insert or remove breakpoints when replaying,
|
|
nor when recording. */
|
|
|
|
static int
|
|
record_insert_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
if (!RECORD_IS_REPLAY)
|
|
{
|
|
struct cleanup *old_cleanups = record_gdb_operation_disable_set ();
|
|
int ret = record_beneath_to_insert_breakpoint (gdbarch, bp_tgt);
|
|
|
|
do_cleanups (old_cleanups);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
record_remove_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
if (!RECORD_IS_REPLAY)
|
|
{
|
|
struct cleanup *old_cleanups = record_gdb_operation_disable_set ();
|
|
int ret = record_beneath_to_remove_breakpoint (gdbarch, bp_tgt);
|
|
|
|
do_cleanups (old_cleanups);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
record_can_execute_reverse (void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
init_record_ops (void)
|
|
{
|
|
record_ops.to_shortname = "record";
|
|
record_ops.to_longname = "Process record and replay target";
|
|
record_ops.to_doc =
|
|
"Log program while executing and replay execution from log.";
|
|
record_ops.to_open = record_open;
|
|
record_ops.to_close = record_close;
|
|
record_ops.to_resume = record_resume;
|
|
record_ops.to_wait = record_wait;
|
|
record_ops.to_disconnect = record_disconnect;
|
|
record_ops.to_detach = record_detach;
|
|
record_ops.to_mourn_inferior = record_mourn_inferior;
|
|
record_ops.to_kill = record_kill;
|
|
record_ops.to_create_inferior = find_default_create_inferior;
|
|
record_ops.to_store_registers = record_store_registers;
|
|
record_ops.to_xfer_partial = record_xfer_partial;
|
|
record_ops.to_insert_breakpoint = record_insert_breakpoint;
|
|
record_ops.to_remove_breakpoint = record_remove_breakpoint;
|
|
record_ops.to_can_execute_reverse = record_can_execute_reverse;
|
|
record_ops.to_stratum = record_stratum;
|
|
record_ops.to_magic = OPS_MAGIC;
|
|
}
|
|
|
|
static void
|
|
show_record_debug (struct ui_file *file, int from_tty,
|
|
struct cmd_list_element *c, const char *value)
|
|
{
|
|
fprintf_filtered (file, _("Debugging of process record target is %s.\n"),
|
|
value);
|
|
}
|
|
|
|
/* Alias for "target record". */
|
|
|
|
static void
|
|
cmd_record_start (char *args, int from_tty)
|
|
{
|
|
execute_command ("target record", from_tty);
|
|
}
|
|
|
|
/* Truncate the record log from the present point
|
|
of replay until the end. */
|
|
|
|
static void
|
|
cmd_record_delete (char *args, int from_tty)
|
|
{
|
|
if (current_target.to_stratum == record_stratum)
|
|
{
|
|
if (RECORD_IS_REPLAY)
|
|
{
|
|
if (!from_tty || query (_("Delete the log from this point forward "
|
|
"and begin to record the running message "
|
|
"at current PC?")))
|
|
record_list_release_following (record_list);
|
|
}
|
|
else
|
|
printf_unfiltered (_("Already at end of record list.\n"));
|
|
|
|
}
|
|
else
|
|
printf_unfiltered (_("Process record is not started.\n"));
|
|
}
|
|
|
|
/* Implement the "stoprecord" command. */
|
|
|
|
static void
|
|
cmd_record_stop (char *args, int from_tty)
|
|
{
|
|
if (current_target.to_stratum == record_stratum)
|
|
{
|
|
unpush_target (&record_ops);
|
|
printf_unfiltered (_("Process record is stoped and all execution "
|
|
"log is deleted.\n"));
|
|
}
|
|
else
|
|
printf_unfiltered (_("Process record is not started.\n"));
|
|
}
|
|
|
|
/* Set upper limit of record log size. */
|
|
|
|
static void
|
|
set_record_insn_max_num (char *args, int from_tty, struct cmd_list_element *c)
|
|
{
|
|
if (record_insn_num > record_insn_max_num && record_insn_max_num)
|
|
{
|
|
/* Count down record_insn_num while releasing records from list. */
|
|
while (record_insn_num > record_insn_max_num)
|
|
{
|
|
record_list_release_first ();
|
|
record_insn_num--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Print the current index into the record log (number of insns recorded
|
|
so far). */
|
|
|
|
static void
|
|
show_record_insn_number (char *ignore, int from_tty)
|
|
{
|
|
printf_unfiltered (_("Record instruction number is %d.\n"),
|
|
record_insn_num);
|
|
}
|
|
|
|
static struct cmd_list_element *record_cmdlist, *set_record_cmdlist,
|
|
*show_record_cmdlist, *info_record_cmdlist;
|
|
|
|
static void
|
|
set_record_command (char *args, int from_tty)
|
|
{
|
|
printf_unfiltered (_("\
|
|
\"set record\" must be followed by an apporpriate subcommand.\n"));
|
|
help_list (set_record_cmdlist, "set record ", all_commands, gdb_stdout);
|
|
}
|
|
|
|
static void
|
|
show_record_command (char *args, int from_tty)
|
|
{
|
|
cmd_show_list (show_record_cmdlist, from_tty, "");
|
|
}
|
|
|
|
static void
|
|
info_record_command (char *args, int from_tty)
|
|
{
|
|
cmd_show_list (info_record_cmdlist, from_tty, "");
|
|
}
|
|
|
|
void
|
|
_initialize_record (void)
|
|
{
|
|
/* Init record_first. */
|
|
record_first.prev = NULL;
|
|
record_first.next = NULL;
|
|
record_first.type = record_end;
|
|
|
|
init_record_ops ();
|
|
add_target (&record_ops);
|
|
|
|
add_setshow_zinteger_cmd ("record", no_class, &record_debug,
|
|
_("Set debugging of record/replay feature."),
|
|
_("Show debugging of record/replay feature."),
|
|
_("When enabled, debugging output for "
|
|
"record/replay feature is displayed."),
|
|
NULL, show_record_debug, &setdebuglist,
|
|
&showdebuglist);
|
|
|
|
add_prefix_cmd ("record", class_obscure, cmd_record_start,
|
|
_("Abbreviated form of \"target record\" command."),
|
|
&record_cmdlist, "record ", 0, &cmdlist);
|
|
add_com_alias ("rec", "record", class_obscure, 1);
|
|
add_prefix_cmd ("record", class_support, set_record_command,
|
|
_("Set record options"), &set_record_cmdlist,
|
|
"set record ", 0, &setlist);
|
|
add_alias_cmd ("rec", "record", class_obscure, 1, &setlist);
|
|
add_prefix_cmd ("record", class_support, show_record_command,
|
|
_("Show record options"), &show_record_cmdlist,
|
|
"show record ", 0, &showlist);
|
|
add_alias_cmd ("rec", "record", class_obscure, 1, &showlist);
|
|
add_prefix_cmd ("record", class_support, info_record_command,
|
|
_("Info record options"), &info_record_cmdlist,
|
|
"info record ", 0, &infolist);
|
|
add_alias_cmd ("rec", "record", class_obscure, 1, &infolist);
|
|
|
|
|
|
add_cmd ("delete", class_obscure, cmd_record_delete,
|
|
_("Delete the rest of execution log and start recording it anew."),
|
|
&record_cmdlist);
|
|
add_alias_cmd ("d", "delete", class_obscure, 1, &record_cmdlist);
|
|
add_alias_cmd ("del", "delete", class_obscure, 1, &record_cmdlist);
|
|
|
|
add_cmd ("stop", class_obscure, cmd_record_stop,
|
|
_("Stop the record/replay target."),
|
|
&record_cmdlist);
|
|
add_alias_cmd ("s", "stop", class_obscure, 1, &record_cmdlist);
|
|
|
|
/* Record instructions number limit command. */
|
|
add_setshow_boolean_cmd ("stop-at-limit", no_class,
|
|
&record_stop_at_limit, _("\
|
|
Set whether record/replay stops when record/replay buffer becomes full."), _("\
|
|
Show whether record/replay stops when record/replay buffer becomes full."), _("\
|
|
Default is ON.\n\
|
|
When ON, if the record/replay buffer becomes full, ask user what to do.\n\
|
|
When OFF, if the record/replay buffer becomes full,\n\
|
|
delete the oldest recorded instruction to make room for each new one."),
|
|
NULL, NULL,
|
|
&set_record_cmdlist, &show_record_cmdlist);
|
|
add_setshow_uinteger_cmd ("insn-number-max", no_class,
|
|
&record_insn_max_num,
|
|
_("Set record/replay buffer limit."),
|
|
_("Show record/replay buffer limit."), _("\
|
|
Set the maximum number of instructions to be stored in the\n\
|
|
record/replay buffer. Zero means unlimited. Default is 200000."),
|
|
set_record_insn_max_num,
|
|
NULL, &set_record_cmdlist, &show_record_cmdlist);
|
|
add_cmd ("insn-number", class_obscure, show_record_insn_number,
|
|
_("Show the current number of instructions in the "
|
|
"record/replay buffer."), &info_record_cmdlist);
|
|
}
|