/* Process record and replay target for GDB, the GNU debugger.
- Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2008-2012 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbthread.h"
#include "event-top.h"
#include "exceptions.h"
+#include "completer.h"
+#include "arch-utils.h"
+#include "gdbcore.h"
+#include "exec.h"
#include "record.h"
+#include "elf-bfd.h"
+#include "gcore.h"
+#include "event-loop.h"
+#include "inf-loop.h"
#include <signal.h>
+/* This module implements "target record", also known as "process
+ record and replay". This target sits on top of a "normal" target
+ (a target that "has execution"), and provides a record and replay
+ functionality, including reverse debugging.
+
+ Target record has two modes: recording, and replaying.
+
+ In record mode, we intercept the to_resume and to_wait methods.
+ Whenever gdb resumes the target, we run the target in single step
+ mode, and we build up an execution log in which, for each executed
+ instruction, we record all changes in memory and register state.
+ This is invisible to the user, to whom it just looks like an
+ ordinary debugging session (except for performance degredation).
+
+ In replay mode, instead of actually letting the inferior run as a
+ process, we simulate its execution by playing back the recorded
+ execution log. For each instruction in the log, we simulate the
+ instruction's side effects by duplicating the changes that it would
+ have made on memory and registers. */
+
#define DEFAULT_RECORD_INSN_MAX_NUM 200000
#define RECORD_IS_REPLAY \
(record_list->next || execution_direction == EXEC_REVERSE)
-/* These are the core struct of record function.
+#define RECORD_FILE_MAGIC netorder32(0x20091016)
- An record_entry is a record of the value change of a register
+/* These are the core structs of the process record functionality.
+
+ A record_entry is a record of the value change of a register
("record_reg") or a part of memory ("record_mem"). And each
- instruction must has a struct record_entry ("record_end") that points out this
- is the last struct record_entry of this instruction.
+ instruction must have a struct record_entry ("record_end") that
+ indicates that this is the last struct record_entry of this
+ instruction.
+
+ Each struct record_entry is linked to "record_list" by "prev" and
+ "next" pointers. */
- Each struct record_entry is linked to "record_list" by "prev" and "next". */
+struct record_mem_entry
+{
+ CORE_ADDR addr;
+ int len;
+ /* Set this flag if target memory for this entry
+ can no longer be accessed. */
+ int mem_entry_not_accessible;
+ union
+ {
+ gdb_byte *ptr;
+ gdb_byte buf[sizeof (gdb_byte *)];
+ } u;
+};
struct record_reg_entry
{
- int num;
- gdb_byte *val;
+ unsigned short num;
+ unsigned short len;
+ union
+ {
+ gdb_byte *ptr;
+ gdb_byte buf[2 * sizeof (gdb_byte *)];
+ } u;
};
-struct record_mem_entry
+struct record_end_entry
{
- CORE_ADDR addr;
- int len;
- gdb_byte *val;
+ enum gdb_signal sigval;
+ ULONGEST insn_num;
};
enum record_type
record_mem
};
+/* This is the data structure that makes up the execution log.
+
+ The execution log consists of a single linked list of entries
+ of type "struct record_entry". It is doubly linked so that it
+ can be traversed in either direction.
+
+ The start of the list is anchored by a struct called
+ "record_first". The pointer "record_list" either points to the
+ last entry that was added to the list (in record mode), or to the
+ next entry in the list that will be executed (in replay mode).
+
+ Each list element (struct record_entry), in addition to next and
+ prev pointers, consists of a union of three entry types: mem, reg,
+ and end. A field called "type" determines which entry type is
+ represented by a given list element.
+
+ Each instruction that is added to the execution log is represented
+ by a variable number of list elements ('entries'). The instruction
+ will have one "reg" entry for each register that is changed by
+ executing the instruction (including the PC in every case). It
+ will also have one "mem" entry for each memory change. Finally,
+ each instruction will have an "end" entry that separates it from
+ the changes associated with the next instruction. */
+
struct record_entry
{
struct record_entry *prev;
struct record_reg_entry reg;
/* mem */
struct record_mem_entry mem;
+ /* end */
+ struct record_end_entry end;
} u;
};
/* This is the debug switch for process record. */
int record_debug = 0;
-/* These list is for execution log. */
+/* If true, query if PREC cannot record memory
+ change of next instruction. */
+int record_memory_query = 0;
+
+struct record_core_buf_entry
+{
+ struct record_core_buf_entry *prev;
+ struct target_section *p;
+ bfd_byte *buf;
+};
+
+/* Record buf with core target. */
+static gdb_byte *record_core_regbuf = NULL;
+static struct target_section *record_core_start;
+static struct target_section *record_core_end;
+static struct record_core_buf_entry *record_core_buf_list = NULL;
+
+/* The following variables are used for managing the linked list that
+ represents the execution log.
+
+ record_first is the anchor that holds down the beginning of the list.
+
+ record_list serves two functions:
+ 1) In record mode, it anchors the end of the list.
+ 2) In replay mode, it traverses the list and points to
+ the next instruction that must be emulated.
+
+ record_arch_list_head and record_arch_list_tail are used to manage
+ a separate list, which is used to build up the change elements of
+ the currently executing instruction during record mode. When this
+ instruction has been completely annotated in the "arch list", it
+ will be appended to the main execution log. */
+
static struct record_entry record_first;
static struct record_entry *record_list = &record_first;
static struct record_entry *record_arch_list_head = NULL;
/* 1 ask user. 0 auto delete the last struct record_entry. */
static int record_stop_at_limit = 1;
-static int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM;
+/* Maximum allowed number of insns in execution log. */
+static unsigned int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM;
+/* Actual count of insns presently in execution log. */
static int record_insn_num = 0;
+/* Count of insns logged so far (may be larger
+ than count of insns presently in execution log). */
+static ULONGEST record_insn_count;
/* The target_ops of process record. */
static struct target_ops record_ops;
+static struct target_ops record_core_ops;
/* The beneath function pointers. */
static struct target_ops *record_beneath_to_resume_ops;
static void (*record_beneath_to_resume) (struct target_ops *, ptid_t, int,
- enum target_signal);
+ enum gdb_signal);
static struct target_ops *record_beneath_to_wait_ops;
static ptid_t (*record_beneath_to_wait) (struct target_ops *, ptid_t,
- struct target_waitstatus *);
+ struct target_waitstatus *,
+ int);
static struct target_ops *record_beneath_to_store_registers_ops;
static void (*record_beneath_to_store_registers) (struct target_ops *,
struct regcache *,
const gdb_byte *writebuf,
ULONGEST offset,
LONGEST len);
-static int (*record_beneath_to_insert_breakpoint) (struct bp_target_info *);
-static int (*record_beneath_to_remove_breakpoint) (struct bp_target_info *);
+static int (*record_beneath_to_insert_breakpoint) (struct gdbarch *,
+ struct bp_target_info *);
+static int (*record_beneath_to_remove_breakpoint) (struct gdbarch *,
+ struct bp_target_info *);
+static int (*record_beneath_to_stopped_by_watchpoint) (void);
+static int (*record_beneath_to_stopped_data_address) (struct target_ops *,
+ CORE_ADDR *);
+static void (*record_beneath_to_async) (void (*) (enum inferior_event_type, void *), void *);
+
+/* Alloc and free functions for record_reg, record_mem, and record_end
+ entries. */
+
+/* Alloc a record_reg record entry. */
+
+static inline struct record_entry *
+record_reg_alloc (struct regcache *regcache, int regnum)
+{
+ struct record_entry *rec;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+
+ rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry));
+ rec->type = record_reg;
+ rec->u.reg.num = regnum;
+ rec->u.reg.len = register_size (gdbarch, regnum);
+ if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
+ rec->u.reg.u.ptr = (gdb_byte *) xmalloc (rec->u.reg.len);
+
+ return rec;
+}
+
+/* Free a record_reg record entry. */
+
+static inline void
+record_reg_release (struct record_entry *rec)
+{
+ gdb_assert (rec->type == record_reg);
+ if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
+ xfree (rec->u.reg.u.ptr);
+ xfree (rec);
+}
+
+/* Alloc a record_mem record entry. */
+
+static inline struct record_entry *
+record_mem_alloc (CORE_ADDR addr, int len)
+{
+ struct record_entry *rec;
+
+ rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry));
+ rec->type = record_mem;
+ rec->u.mem.addr = addr;
+ rec->u.mem.len = len;
+ if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
+ rec->u.mem.u.ptr = (gdb_byte *) xmalloc (len);
+
+ return rec;
+}
+
+/* Free a record_mem record entry. */
+
+static inline void
+record_mem_release (struct record_entry *rec)
+{
+ gdb_assert (rec->type == record_mem);
+ if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
+ xfree (rec->u.mem.u.ptr);
+ xfree (rec);
+}
+
+/* Alloc a record_end record entry. */
+
+static inline struct record_entry *
+record_end_alloc (void)
+{
+ struct record_entry *rec;
+
+ rec = (struct record_entry *) xcalloc (1, sizeof (struct record_entry));
+ rec->type = record_end;
+
+ return rec;
+}
+
+/* Free a record_end record entry. */
+
+static inline void
+record_end_release (struct record_entry *rec)
+{
+ xfree (rec);
+}
+
+/* Free one record entry, any type.
+ Return entry->type, in case caller wants to know. */
+
+static inline enum record_type
+record_entry_release (struct record_entry *rec)
+{
+ enum record_type type = rec->type;
+
+ switch (type) {
+ case record_reg:
+ record_reg_release (rec);
+ break;
+ case record_mem:
+ record_mem_release (rec);
+ break;
+ case record_end:
+ record_end_release (rec);
+ break;
+ }
+ return type;
+}
+
+/* Free all record entries in list pointed to by REC. */
static void
record_list_release (struct record_entry *rec)
{
- struct record_entry *tmp;
-
if (!rec)
return;
while (rec->next)
- {
- rec = rec->next;
- }
+ rec = rec->next;
while (rec->prev)
{
- tmp = rec;
rec = rec->prev;
- if (tmp->type == record_reg)
- xfree (tmp->u.reg.val);
- else if (tmp->type == record_mem)
- xfree (tmp->u.mem.val);
- xfree (tmp);
+ record_entry_release (rec->next);
}
- if (rec != &record_first)
- xfree (rec);
+ if (rec == &record_first)
+ {
+ record_insn_num = 0;
+ record_first.next = NULL;
+ }
+ else
+ record_entry_release (rec);
}
+/* Free all record entries forward of the given list position. */
+
static void
-record_list_release_next (void)
+record_list_release_following (struct record_entry *rec)
{
- struct record_entry *rec = record_list;
struct record_entry *tmp = rec->next;
+
rec->next = NULL;
while (tmp)
{
rec = tmp->next;
- if (tmp->type == record_reg)
- record_insn_num--;
- else if (tmp->type == record_reg)
- xfree (tmp->u.reg.val);
- else if (tmp->type == record_mem)
- xfree (tmp->u.mem.val);
- xfree (tmp);
+ if (record_entry_release (tmp) == record_end)
+ {
+ record_insn_num--;
+ record_insn_count--;
+ }
tmp = rec;
}
}
+/* Delete the first instruction from the beginning of the log, to make
+ room for adding a new instruction at the end of the log.
+
+ Note -- this function does not modify record_insn_num. */
+
static void
record_list_release_first (void)
{
- struct record_entry *tmp = NULL;
- enum record_type type;
+ struct record_entry *tmp;
if (!record_first.next)
return;
+ /* Loop until a record_end. */
while (1)
{
- type = record_first.next->type;
-
- if (type == record_reg)
- xfree (record_first.next->u.reg.val);
- else if (type == record_mem)
- xfree (record_first.next->u.mem.val);
+ /* Cut record_first.next out of the linked list. */
tmp = record_first.next;
record_first.next = tmp->next;
- xfree (tmp);
+ tmp->next->prev = &record_first;
+
+ /* tmp is now isolated, and can be deleted. */
+ if (record_entry_release (tmp) == record_end)
+ break; /* End loop at first record_end. */
if (!record_first.next)
{
gdb_assert (record_insn_num == 1);
- break;
+ break; /* End loop when list is empty. */
}
-
- record_first.next->prev = &record_first;
-
- if (type == record_end)
- break;
}
-
- record_insn_num--;
}
/* Add a struct record_entry to record_arch_list. */
}
}
+/* Return the value storage location of a record entry. */
+static inline gdb_byte *
+record_get_loc (struct record_entry *rec)
+{
+ switch (rec->type) {
+ case record_mem:
+ if (rec->u.mem.len > sizeof (rec->u.mem.u.buf))
+ return rec->u.mem.u.ptr;
+ else
+ return rec->u.mem.u.buf;
+ case record_reg:
+ if (rec->u.reg.len > sizeof (rec->u.reg.u.buf))
+ return rec->u.reg.u.ptr;
+ else
+ return rec->u.reg.u.buf;
+ case record_end:
+ default:
+ gdb_assert_not_reached ("unexpected record_entry type");
+ return NULL;
+ }
+}
+
/* Record the value of a register NUM to record_arch_list. */
int
-record_arch_list_add_reg (struct regcache *regcache, int num)
+record_arch_list_add_reg (struct regcache *regcache, int regnum)
{
struct record_entry *rec;
fprintf_unfiltered (gdb_stdlog,
"Process record: add register num = %d to "
"record list.\n",
- num);
+ regnum);
- rec = (struct record_entry *) xmalloc (sizeof (struct record_entry));
- rec->u.reg.val = (gdb_byte *) xmalloc (MAX_REGISTER_SIZE);
- rec->prev = NULL;
- rec->next = NULL;
- rec->type = record_reg;
- rec->u.reg.num = num;
+ rec = record_reg_alloc (regcache, regnum);
- regcache_raw_read (regcache, num, rec->u.reg.val);
+ regcache_raw_read (regcache, regnum, record_get_loc (rec));
record_arch_list_add (rec);
if (record_debug > 1)
fprintf_unfiltered (gdb_stdlog,
- "Process record: add mem addr = 0x%s len = %d to "
+ "Process record: add mem addr = %s len = %d to "
"record list.\n",
- paddr_nz (addr), len);
+ paddress (target_gdbarch, addr), len);
- if (!addr)
+ if (!addr) /* FIXME: Why? Some arch must permit it... */
return 0;
- rec = (struct record_entry *) xmalloc (sizeof (struct record_entry));
- rec->u.mem.val = (gdb_byte *) xmalloc (len);
- rec->prev = NULL;
- rec->next = NULL;
- rec->type = record_mem;
- rec->u.mem.addr = addr;
- rec->u.mem.len = len;
+ rec = record_mem_alloc (addr, len);
- if (target_read_memory (addr, rec->u.mem.val, len))
+ if (target_read_memory (addr, record_get_loc (rec), len))
{
if (record_debug)
fprintf_unfiltered (gdb_stdlog,
"Process record: error reading memory at "
- "addr = 0x%s len = %d.\n",
- paddr_nz (addr), len);
- xfree (rec->u.mem.val);
- xfree (rec);
+ "addr = %s len = %d.\n",
+ paddress (target_gdbarch, addr), len);
+ record_mem_release (rec);
return -1;
}
fprintf_unfiltered (gdb_stdlog,
"Process record: add end to arch list.\n");
- rec = (struct record_entry *) xmalloc (sizeof (struct record_entry));
- rec->prev = NULL;
- rec->next = NULL;
- rec->type = record_end;
+ rec = record_end_alloc ();
+ rec->u.end.sigval = GDB_SIGNAL_0;
+ rec->u.end.insn_num = ++record_insn_count;
record_arch_list_add (rec);
if (record_stop_at_limit)
{
int q;
+
if (set_terminal)
target_terminal_ours ();
q = yquery (_("Do you want to auto delete previous execution "
if (q)
record_stop_at_limit = 0;
else
- error (_("Process record: inferior program stopped."));
+ error (_("Process record: stopped by user."));
}
}
}
}
+static void
+record_arch_list_cleanups (void *ignore)
+{
+ record_list_release (record_arch_list_tail);
+}
+
/* Before inferior step (when GDB record the running message, inferior
only can step), GDB will call this function to record the values to
record_list. This function will call gdbarch_process_record to
record the running message of inferior and set them to
record_arch_list, and add it to record_list. */
-static void
-record_message_cleanups (void *ignore)
-{
- record_list_release (record_arch_list_tail);
-}
-
static int
-record_message (void *args)
+record_message (struct regcache *regcache, enum gdb_signal signal)
{
int ret;
- struct regcache *regcache = args;
- struct cleanup *old_cleanups = make_cleanup (record_message_cleanups, 0);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct cleanup *old_cleanups = make_cleanup (record_arch_list_cleanups, 0);
record_arch_list_head = NULL;
record_arch_list_tail = NULL;
/* Check record_insn_num. */
record_check_insn_num (1);
- ret = gdbarch_process_record (get_regcache_arch (regcache),
- regcache,
- regcache_read_pc (regcache));
+ /* If gdb sends a signal value to target_resume,
+ save it in the 'end' field of the previous instruction.
+
+ Maybe process record should record what really happened,
+ rather than what gdb pretends has happened.
+
+ So if Linux delivered the signal to the child process during
+ the record mode, we will record it and deliver it again in
+ the replay mode.
+
+ If user says "ignore this signal" during the record mode, then
+ it will be ignored again during the replay mode (no matter if
+ the user says something different, like "deliver this signal"
+ during the replay mode).
+
+ User should understand that nothing he does during the replay
+ mode will change the behavior of the child. If he tries,
+ then that is a user error.
+
+ But we should still deliver the signal to gdb during the replay,
+ if we delivered it during the recording. Therefore we should
+ record the signal during record_wait, not record_resume. */
+ if (record_list != &record_first) /* FIXME better way to check */
+ {
+ gdb_assert (record_list->type == record_end);
+ record_list->u.end.sigval = signal;
+ }
+
+ if (signal == GDB_SIGNAL_0
+ || !gdbarch_process_record_signal_p (gdbarch))
+ ret = gdbarch_process_record (gdbarch,
+ regcache,
+ regcache_read_pc (regcache));
+ else
+ ret = gdbarch_process_record_signal (gdbarch,
+ regcache,
+ signal);
+
if (ret > 0)
error (_("Process record: inferior program stopped."));
if (ret < 0)
return 1;
}
+struct record_message_args {
+ struct regcache *regcache;
+ enum gdb_signal signal;
+};
+
+static int
+record_message_wrapper (void *args)
+{
+ struct record_message_args *record_args = args;
+
+ return record_message (record_args->regcache, record_args->signal);
+}
+
static int
-do_record_message (struct regcache *regcache)
+record_message_wrapper_safe (struct regcache *regcache,
+ enum gdb_signal signal)
{
- return catch_errors (record_message, regcache, NULL, RETURN_MASK_ALL);
+ struct record_message_args args;
+
+ args.regcache = regcache;
+ args.signal = signal;
+
+ return catch_errors (record_message_wrapper, &args, NULL, RETURN_MASK_ALL);
}
/* Set to 1 if record_store_registers and record_xfer_partial
return old_cleanups;
}
+/* Flag set to TRUE for target_stopped_by_watchpoint. */
+static int record_hw_watchpoint = 0;
+
+/* Execute one instruction from the record log. Each instruction in
+ the log will be represented by an arbitrary sequence of register
+ entries and memory entries, followed by an 'end' entry. */
+
+static inline void
+record_exec_insn (struct regcache *regcache, struct gdbarch *gdbarch,
+ struct record_entry *entry)
+{
+ switch (entry->type)
+ {
+ case 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 (entry),
+ entry->u.reg.num);
+
+ regcache_cooked_read (regcache, entry->u.reg.num, reg);
+ regcache_cooked_write (regcache, entry->u.reg.num,
+ record_get_loc (entry));
+ memcpy (record_get_loc (entry), reg, entry->u.reg.len);
+ }
+ break;
+
+ case record_mem: /* mem */
+ {
+ /* Nothing to do if the entry is flagged not_accessible. */
+ if (!entry->u.mem.mem_entry_not_accessible)
+ {
+ gdb_byte *mem = alloca (entry->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 (entry),
+ paddress (gdbarch, entry->u.mem.addr),
+ entry->u.mem.len);
+
+ if (target_read_memory (entry->u.mem.addr, mem, entry->u.mem.len))
+ {
+ entry->u.mem.mem_entry_not_accessible = 1;
+ if (record_debug)
+ warning (_("Process record: error reading memory at "
+ "addr = %s len = %d."),
+ paddress (gdbarch, entry->u.mem.addr),
+ entry->u.mem.len);
+ }
+ else
+ {
+ if (target_write_memory (entry->u.mem.addr,
+ record_get_loc (entry),
+ entry->u.mem.len))
+ {
+ entry->u.mem.mem_entry_not_accessible = 1;
+ if (record_debug)
+ warning (_("Process record: error writing memory at "
+ "addr = %s len = %d."),
+ paddress (gdbarch, entry->u.mem.addr),
+ entry->u.mem.len);
+ }
+ else
+ {
+ memcpy (record_get_loc (entry), mem, entry->u.mem.len);
+
+ /* We've changed memory --- check if a hardware
+ watchpoint should trap. Note that this
+ presently assumes the target beneath supports
+ continuable watchpoints. On non-continuable
+ watchpoints target, we'll want to check this
+ _before_ actually doing the memory change, and
+ not doing the change at all if the watchpoint
+ traps. */
+ if (hardware_watchpoint_inserted_in_range
+ (get_regcache_aspace (regcache),
+ entry->u.mem.addr, entry->u.mem.len))
+ record_hw_watchpoint = 1;
+ }
+ }
+ }
+ }
+ break;
+ }
+}
+
+static struct target_ops *tmp_to_resume_ops;
+static void (*tmp_to_resume) (struct target_ops *, ptid_t, int,
+ enum gdb_signal);
+static struct target_ops *tmp_to_wait_ops;
+static ptid_t (*tmp_to_wait) (struct target_ops *, ptid_t,
+ struct target_waitstatus *,
+ int);
+static struct target_ops *tmp_to_store_registers_ops;
+static void (*tmp_to_store_registers) (struct target_ops *,
+ struct regcache *,
+ int regno);
+static struct target_ops *tmp_to_xfer_partial_ops;
+static LONGEST (*tmp_to_xfer_partial) (struct target_ops *ops,
+ enum target_object object,
+ const char *annex,
+ gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset,
+ LONGEST len);
+static int (*tmp_to_insert_breakpoint) (struct gdbarch *,
+ struct bp_target_info *);
+static int (*tmp_to_remove_breakpoint) (struct gdbarch *,
+ struct bp_target_info *);
+static int (*tmp_to_stopped_by_watchpoint) (void);
+static int (*tmp_to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
+static int (*tmp_to_stopped_data_address) (struct target_ops *, CORE_ADDR *);
+static void (*tmp_to_async) (void (*) (enum inferior_event_type, void *), void *);
+
+static void record_restore (void);
+
+/* Asynchronous signal handle registered as event loop source for when
+ we have pending events ready to be passed to the core. */
+
+static struct async_event_handler *record_async_inferior_event_token;
+
static void
-record_open (char *name, int from_tty)
+record_async_inferior_event_handler (gdb_client_data data)
{
- struct target_ops *t;
+ inferior_event_handler (INF_REG_EVENT, NULL);
+}
+
+/* Open the process record target. */
+
+static void
+record_core_open_1 (char *name, int from_tty)
+{
+ struct regcache *regcache = get_current_regcache ();
+ int regnum = gdbarch_num_regs (get_regcache_arch (regcache));
+ int i;
+
+ /* Get record_core_regbuf. */
+ target_fetch_registers (regcache, -1);
+ record_core_regbuf = xmalloc (MAX_REGISTER_SIZE * regnum);
+ for (i = 0; i < regnum; i ++)
+ regcache_raw_collect (regcache, i,
+ record_core_regbuf + MAX_REGISTER_SIZE * i);
+
+ /* Get record_core_start and record_core_end. */
+ if (build_section_table (core_bfd, &record_core_start, &record_core_end))
+ {
+ xfree (record_core_regbuf);
+ record_core_regbuf = NULL;
+ error (_("\"%s\": Can't find sections: %s"),
+ bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ()));
+ }
+
+ push_target (&record_core_ops);
+ record_restore ();
+}
+
+/* "to_open" target method for 'live' processes. */
+static void
+record_open_1 (char *name, int from_tty)
+{
if (record_debug)
fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n");
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 (current_gdbarch))
+ if (!gdbarch_process_record_p (target_gdbarch))
error (_("Process record: the current architecture doesn't support "
"record function."));
+ if (!tmp_to_resume)
+ error (_("Could not find 'to_resume' method on the target stack."));
+ if (!tmp_to_wait)
+ error (_("Could not find 'to_wait' method on the target stack."));
+ if (!tmp_to_store_registers)
+ error (_("Could not find 'to_store_registers' "
+ "method on the target stack."));
+ if (!tmp_to_insert_breakpoint)
+ error (_("Could not find 'to_insert_breakpoint' "
+ "method on the target stack."));
+ if (!tmp_to_remove_breakpoint)
+ error (_("Could not find 'to_remove_breakpoint' "
+ "method on the target stack."));
+ if (!tmp_to_stopped_by_watchpoint)
+ error (_("Could not find 'to_stopped_by_watchpoint' "
+ "method on the target stack."));
+ if (!tmp_to_stopped_data_address)
+ error (_("Could not find 'to_stopped_data_address' "
+ "method on the target stack."));
+
+ push_target (&record_ops);
+}
+
+static void record_init_record_breakpoints (void);
+
+/* "to_open" target method. Open the process record target. */
+
+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 if record target is already running. */
if (current_target.to_stratum == record_stratum)
- {
- if (!nquery
- (_("Process record target already running, do you want to delete "
- "the old record log?")))
- return;
- }
-
- /*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;
+ error (_("Process record target already running. Use \"record stop\" to "
+ "stop record target first."));
+
+ /* Reset the tmp beneath pointers. */
+ tmp_to_resume_ops = NULL;
+ tmp_to_resume = NULL;
+ tmp_to_wait_ops = NULL;
+ tmp_to_wait = NULL;
+ tmp_to_store_registers_ops = NULL;
+ tmp_to_store_registers = NULL;
+ tmp_to_xfer_partial_ops = NULL;
+ tmp_to_xfer_partial = NULL;
+ tmp_to_insert_breakpoint = NULL;
+ tmp_to_remove_breakpoint = NULL;
+ tmp_to_stopped_by_watchpoint = NULL;
+ tmp_to_stopped_data_address = NULL;
+ tmp_to_async = NULL;
/* Set the beneath function pointers. */
for (t = current_target.beneath; t != NULL; t = t->beneath)
{
- if (!record_beneath_to_resume)
+ if (!tmp_to_resume)
{
- record_beneath_to_resume = t->to_resume;
- record_beneath_to_resume_ops = t;
+ tmp_to_resume = t->to_resume;
+ tmp_to_resume_ops = t;
}
- if (!record_beneath_to_wait)
+ if (!tmp_to_wait)
{
- record_beneath_to_wait = t->to_wait;
- record_beneath_to_wait_ops = t;
+ tmp_to_wait = t->to_wait;
+ tmp_to_wait_ops = t;
}
- if (!record_beneath_to_store_registers)
+ if (!tmp_to_store_registers)
{
- record_beneath_to_store_registers = t->to_store_registers;
- record_beneath_to_store_registers_ops = t;
+ tmp_to_store_registers = t->to_store_registers;
+ tmp_to_store_registers_ops = t;
}
- if (!record_beneath_to_xfer_partial)
+ if (!tmp_to_xfer_partial)
{
- record_beneath_to_xfer_partial = t->to_xfer_partial;
- record_beneath_to_xfer_partial_ops = t;
+ tmp_to_xfer_partial = t->to_xfer_partial;
+ tmp_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 (!tmp_to_insert_breakpoint)
+ tmp_to_insert_breakpoint = t->to_insert_breakpoint;
+ if (!tmp_to_remove_breakpoint)
+ tmp_to_remove_breakpoint = t->to_remove_breakpoint;
+ if (!tmp_to_stopped_by_watchpoint)
+ tmp_to_stopped_by_watchpoint = t->to_stopped_by_watchpoint;
+ if (!tmp_to_stopped_data_address)
+ tmp_to_stopped_data_address = t->to_stopped_data_address;
+ if (!tmp_to_async)
+ tmp_to_async = t->to_async;
}
- 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);
+ if (!tmp_to_xfer_partial)
+ error (_("Could not find 'to_xfer_partial' method on the target stack."));
/* Reset */
record_insn_num = 0;
+ record_insn_count = 0;
record_list = &record_first;
record_list->next = NULL;
+
+ /* Set the tmp beneath pointers to beneath pointers. */
+ record_beneath_to_resume_ops = tmp_to_resume_ops;
+ record_beneath_to_resume = tmp_to_resume;
+ record_beneath_to_wait_ops = tmp_to_wait_ops;
+ record_beneath_to_wait = tmp_to_wait;
+ record_beneath_to_store_registers_ops = tmp_to_store_registers_ops;
+ record_beneath_to_store_registers = tmp_to_store_registers;
+ record_beneath_to_xfer_partial_ops = tmp_to_xfer_partial_ops;
+ record_beneath_to_xfer_partial = tmp_to_xfer_partial;
+ record_beneath_to_insert_breakpoint = tmp_to_insert_breakpoint;
+ record_beneath_to_remove_breakpoint = tmp_to_remove_breakpoint;
+ record_beneath_to_stopped_by_watchpoint = tmp_to_stopped_by_watchpoint;
+ record_beneath_to_stopped_data_address = tmp_to_stopped_data_address;
+ record_beneath_to_async = tmp_to_async;
+
+ if (core_bfd)
+ record_core_open_1 (name, from_tty);
+ else
+ record_open_1 (name, from_tty);
+
+ /* Register extra event sources in the event loop. */
+ record_async_inferior_event_token
+ = create_async_event_handler (record_async_inferior_event_handler,
+ NULL);
+
+ record_init_record_breakpoints ();
}
+/* "to_close" target method. Close the process record target. */
+
static void
record_close (int quitting)
{
+ struct record_core_buf_entry *entry;
+
if (record_debug)
fprintf_unfiltered (gdb_stdlog, "Process record: record_close\n");
record_list_release (record_list);
+
+ /* Release record_core_regbuf. */
+ if (record_core_regbuf)
+ {
+ xfree (record_core_regbuf);
+ record_core_regbuf = NULL;
+ }
+
+ /* Release record_core_buf_list. */
+ if (record_core_buf_list)
+ {
+ for (entry = record_core_buf_list->prev; entry; entry = entry->prev)
+ {
+ xfree (record_core_buf_list);
+ record_core_buf_list = entry;
+ }
+ record_core_buf_list = NULL;
+ }
+
+ if (record_async_inferior_event_token)
+ delete_async_event_handler (&record_async_inferior_event_token);
}
static int record_resume_step = 0;
-static enum target_signal record_resume_siggnal;
-static int record_resume_error;
+
+/* True if we've been resumed, and so each record_wait call should
+ advance execution. If this is false, record_wait will return a
+ TARGET_WAITKIND_IGNORE. */
+static int record_resumed = 0;
+
+/* The execution direction of the last resume we got. This is
+ necessary for async mode. Vis (order is not strictly accurate):
+
+ 1. user has the global execution direction set to forward
+ 2. user does a reverse-step command
+ 3. record_resume is called with global execution direction
+ temporarily switched to reverse
+ 4. GDB's execution direction is reverted back to forward
+ 5. target record notifies event loop there's an event to handle
+ 6. infrun asks the target which direction was it going, and switches
+ the global execution direction accordingly (to reverse)
+ 7. infrun polls an event out of the record target, and handles it
+ 8. GDB goes back to the event loop, and goto #4.
+*/
+static enum exec_direction_kind record_execution_dir = EXEC_FORWARD;
+
+/* "to_resume" target method. Resume the process record target. */
static void
record_resume (struct target_ops *ops, ptid_t ptid, int step,
- enum target_signal siggnal)
+ enum gdb_signal signal)
{
record_resume_step = step;
- record_resume_siggnal = siggnal;
+ record_resumed = 1;
+ record_execution_dir = execution_direction;
if (!RECORD_IS_REPLAY)
{
- if (do_record_message (get_current_regcache ()))
- {
- record_resume_error = 0;
- }
- else
+ struct gdbarch *gdbarch = target_thread_architecture (ptid);
+
+ record_message (get_current_regcache (), signal);
+
+ if (!step)
{
- record_resume_error = 1;
- return;
+ /* This is not hard single step. */
+ if (!gdbarch_software_single_step_p (gdbarch))
+ {
+ /* This is a normal continue. */
+ step = 1;
+ }
+ else
+ {
+ /* This arch support soft sigle step. */
+ if (single_step_breakpoints_inserted ())
+ {
+ /* This is a soft single step. */
+ record_resume_step = 1;
+ }
+ else
+ {
+ /* This is a continue.
+ Try to insert a soft single step breakpoint. */
+ if (!gdbarch_software_single_step (gdbarch,
+ get_current_frame ()))
+ {
+ /* This system don't want use soft single step.
+ Use hard sigle step. */
+ step = 1;
+ }
+ }
+ }
}
- record_beneath_to_resume (record_beneath_to_resume_ops, ptid, 1,
- siggnal);
+
+ record_beneath_to_resume (record_beneath_to_resume_ops,
+ ptid, step, signal);
+ }
+
+ /* We are about to start executing the inferior (or simulate it),
+ let's register it with the event loop. */
+ if (target_can_async_p ())
+ {
+ target_async (inferior_event_handler, 0);
+ /* Notify the event loop there's an event to wait for. We do
+ most of the work in record_wait. */
+ mark_async_event_handler (record_async_inferior_event_token);
}
}
static int record_get_sig = 0;
+/* SIGINT signal handler, registered by "to_wait" method. */
+
static void
record_sig_handler (int signo)
{
record_list = record_list->prev;
}
-/* In replay mode, this function examines the recorded log and
- determines where to stop. */
+/* "to_wait" target method for process record target.
+
+ In record mode, the target is always run in singlestep mode
+ (even when gdb says to continue). The to_wait method intercepts
+ the stop events and determines which ones are to be passed on to
+ gdb. Most stop events are just singlestep events that gdb is not
+ to know about, so the to_wait method just records them and keeps
+ singlestepping.
+
+ In replay mode, this function emulates the recorded execution log,
+ one instruction at a time (forward or backward), and determines
+ where to stop. */
static ptid_t
-record_wait (struct target_ops *ops,
- ptid_t ptid, struct target_waitstatus *status)
+record_wait_1 (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);
+ "record_resume_step = %d, record_resumed = %d, direction=%s\n",
+ record_resume_step, record_resumed,
+ record_execution_dir == EXEC_FORWARD ? "forward" : "reverse");
- if (!RECORD_IS_REPLAY)
+ if (!record_resumed)
{
- 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;
- }
+ gdb_assert ((options & TARGET_WNOHANG) != 0);
+
+ /* No interesting event. */
+ status->kind = TARGET_WAITKIND_IGNORE;
+ return minus_one_ptid;
+ }
+
+ record_get_sig = 0;
+ signal (SIGINT, record_sig_handler);
+ if (!RECORD_IS_REPLAY && ops != &record_core_ops)
+ {
if (record_resume_step)
{
/* This is a single step. */
return record_beneath_to_wait (record_beneath_to_wait_ops,
- ptid, status);
+ ptid, status, options);
}
else
{
/* This is not a single step. */
ptid_t ret;
CORE_ADDR tmp_pc;
+ struct gdbarch *gdbarch = target_thread_architecture (inferior_ptid);
while (1)
{
ret = record_beneath_to_wait (record_beneath_to_wait_ops,
- ptid, status);
+ ptid, status, options);
+ if (status->kind == TARGET_WAITKIND_IGNORE)
+ {
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: record_wait "
+ "target beneath not done yet\n");
+ return ret;
+ }
+
+ if (single_step_breakpoints_inserted ())
+ remove_single_step_breakpoints ();
+ if (record_resume_step)
+ return ret;
+
+ /* Is this a SIGTRAP? */
if (status->kind == TARGET_WAITKIND_STOPPED
- && status->value.sig == TARGET_SIGNAL_TRAP)
+ && status->value.sig == GDB_SIGNAL_TRAP)
{
- /* Check if there is a breakpoint. */
+ struct regcache *regcache;
+ struct address_space *aspace;
+
+ /* Yes -- this is likely our single-step finishing,
+ but check if there's any reason the core would be
+ interested in the event. */
+
registers_changed ();
- tmp_pc = regcache_read_pc (get_current_regcache ());
- if (breakpoint_inserted_here_p (tmp_pc))
+ regcache = get_current_regcache ();
+ tmp_pc = regcache_read_pc (regcache);
+ aspace = get_regcache_aspace (regcache);
+
+ if (target_stopped_by_watchpoint ())
+ {
+ /* Always interested in watchpoints. */
+ }
+ else if (breakpoint_inserted_here_p (aspace, tmp_pc))
{
- /* There is a breakpoint. */
- CORE_ADDR decr_pc_after_break =
- gdbarch_decr_pc_after_break
- (get_regcache_arch (get_current_regcache ()));
- if (decr_pc_after_break)
+ /* There is a breakpoint here. Let the core
+ handle it. */
+ if (software_breakpoint_inserted_here_p (aspace, tmp_pc))
{
- regcache_write_pc (get_thread_regcache (ret),
- tmp_pc + decr_pc_after_break);
+ struct gdbarch *gdbarch
+ = get_regcache_arch (regcache);
+ CORE_ADDR decr_pc_after_break
+ = gdbarch_decr_pc_after_break (gdbarch);
+ if (decr_pc_after_break)
+ regcache_write_pc (regcache,
+ tmp_pc + decr_pc_after_break);
}
}
else
{
- /* There is not a breakpoint. */
- if (!do_record_message (get_current_regcache ()))
+ /* This is a single-step trap. Record the
+ insn and issue another step.
+ FIXME: this part can be a random SIGTRAP too.
+ But GDB cannot handle it. */
+ int step = 1;
+
+ if (!record_message_wrapper_safe (regcache,
+ GDB_SIGNAL_0))
+ {
+ status->kind = TARGET_WAITKIND_STOPPED;
+ status->value.sig = GDB_SIGNAL_0;
+ break;
+ }
+
+ if (gdbarch_software_single_step_p (gdbarch))
{
- break;
+ /* Try to insert the software single step breakpoint.
+ If insert success, set step to 0. */
+ set_executing (inferior_ptid, 0);
+ reinit_frame_cache ();
+ if (gdbarch_software_single_step (gdbarch,
+ get_current_frame ()))
+ step = 0;
+ set_executing (inferior_ptid, 1);
}
+
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: record_wait "
+ "issuing one more step in the target beneath\n");
record_beneath_to_resume (record_beneath_to_resume_ops,
- ptid, 1,
- record_resume_siggnal);
+ ptid, step,
+ GDB_SIGNAL_0);
continue;
}
}
else
{
struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct address_space *aspace = get_regcache_aspace (regcache);
int continue_flag = 1;
int first_record_end = 1;
struct cleanup *old_cleanups = make_cleanup (record_wait_cleanups, 0);
CORE_ADDR tmp_pc;
+ record_hw_watchpoint = 0;
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 (breakpoint_inserted_here_p (aspace, tmp_pc))
{
+ int decr_pc_after_break = gdbarch_decr_pc_after_break (gdbarch);
+
if (record_debug)
fprintf_unfiltered (gdb_stdlog,
- "Process record: break at 0x%s.\n",
- paddr_nz (tmp_pc));
- if (gdbarch_decr_pc_after_break (get_regcache_arch (regcache))
- && !record_resume_step)
+ "Process record: break at %s.\n",
+ paddress (gdbarch, tmp_pc));
+
+ if (decr_pc_after_break
+ && !record_resume_step
+ && software_breakpoint_inserted_here_p (aspace, tmp_pc))
regcache_write_pc (regcache,
- tmp_pc +
- gdbarch_decr_pc_after_break
- (get_regcache_arch (regcache)));
+ tmp_pc + decr_pc_after_break);
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.
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_list->u.reg.val);
- memcpy (record_list->u.reg.val, reg, MAX_REGISTER_SIZE);
- }
- else if (record_list->type == record_mem)
- {
- /* mem */
- 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 = 0x%s len = %d.\n",
- host_address_to_string (record_list),
- paddr_nz (record_list->u.mem.addr),
- record_list->u.mem.len);
+ record_exec_insn (regcache, gdbarch, record_list);
- if (target_read_memory
- (record_list->u.mem.addr, mem, record_list->u.mem.len))
- error (_("Process record: error reading memory at "
- "addr = 0x%s len = %d."),
- paddr_nz (record_list->u.mem.addr),
- record_list->u.mem.len);
-
- if (target_write_memory
- (record_list->u.mem.addr, record_list->u.mem.val,
- record_list->u.mem.len))
- error (_
- ("Process record: error writing memory at "
- "addr = 0x%s len = %d."),
- paddr_nz (record_list->u.mem.addr),
- record_list->u.mem.len);
-
- memcpy (record_list->u.mem.val, mem, record_list->u.mem.len);
- }
- else
+ if (record_list->type == record_end)
{
if (record_debug > 1)
fprintf_unfiltered (gdb_stdlog,
/* check breakpoint */
tmp_pc = regcache_read_pc (regcache);
- if (breakpoint_inserted_here_p (tmp_pc))
+ if (breakpoint_inserted_here_p (aspace, tmp_pc))
{
+ int decr_pc_after_break
+ = gdbarch_decr_pc_after_break (gdbarch);
+
if (record_debug)
fprintf_unfiltered (gdb_stdlog,
"Process record: break "
- "at 0x%s.\n",
- paddr_nz (tmp_pc));
- if (gdbarch_decr_pc_after_break (get_regcache_arch (regcache))
+ "at %s.\n",
+ paddress (gdbarch, tmp_pc));
+ if (decr_pc_after_break
&& execution_direction == EXEC_FORWARD
- && !record_resume_step)
+ && !record_resume_step
+ && software_breakpoint_inserted_here_p (aspace,
+ tmp_pc))
regcache_write_pc (regcache,
- tmp_pc +
- gdbarch_decr_pc_after_break
- (get_regcache_arch (regcache)));
+ tmp_pc + decr_pc_after_break);
+ continue_flag = 0;
+ }
+
+ if (record_hw_watchpoint)
+ {
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: hit hw "
+ "watchpoint.\n");
continue_flag = 0;
}
+ /* Check target signal */
+ if (record_list->u.end.sigval != GDB_SIGNAL_0)
+ /* FIXME: better way to check */
+ continue_flag = 0;
}
}
}
while (continue_flag);
- signal (SIGINT, handle_sigint);
-
replay_out:
if (record_get_sig)
- status->value.sig = TARGET_SIGNAL_INT;
+ status->value.sig = GDB_SIGNAL_INT;
+ else if (record_list->u.end.sigval != GDB_SIGNAL_0)
+ /* FIXME: better way to check */
+ status->value.sig = record_list->u.end.sigval;
else
- status->value.sig = TARGET_SIGNAL_TRAP;
+ status->value.sig = GDB_SIGNAL_TRAP;
discard_cleanups (old_cleanups);
}
+ signal (SIGINT, handle_sigint);
+
do_cleanups (set_cleanups);
return inferior_ptid;
}
-static void
-record_disconnect (struct target_ops *target, char *args, int from_tty)
+static ptid_t
+record_wait (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *status,
+ int options)
{
- if (record_debug)
- fprintf_unfiltered (gdb_stdlog, "Process record: record_disconnect\n");
+ ptid_t return_ptid;
- unpush_target (&record_ops);
+ return_ptid = record_wait_1 (ops, ptid, status, options);
+ if (status->kind != TARGET_WAITKIND_IGNORE)
+ {
+ /* We're reporting a stop. Make sure any spurious
+ target_wait(WNOHANG) doesn't advance the target until the
+ core wants us resumed again. */
+ record_resumed = 0;
+ }
+ return return_ptid;
+}
+
+static int
+record_stopped_by_watchpoint (void)
+{
+ if (RECORD_IS_REPLAY)
+ return record_hw_watchpoint;
+ else
+ return record_beneath_to_stopped_by_watchpoint ();
+}
+
+static int
+record_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
+{
+ if (RECORD_IS_REPLAY)
+ return 0;
+ else
+ return record_beneath_to_stopped_data_address (ops, addr_p);
+}
+
+/* "to_disconnect" method for process record target. */
+
+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);
}
+/* "to_detach" method for process record target. */
+
static void
record_detach (struct target_ops *ops, char *args, int from_tty)
{
target_detach (args, from_tty);
}
+/* "to_mourn_inferior" method for process record target. */
+
static void
record_mourn_inferior (struct target_ops *ops)
{
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_insn_num++;
}
+/* "to_store_registers" method for process record target. */
+
static void
record_store_registers (struct target_ops *ops, struct regcache *regcache,
int regno)
if (RECORD_IS_REPLAY)
{
int n;
- struct cleanup *old_cleanups;
/* Let user choose if he wants to write register or not. */
if (regno < 0)
n =
- nquery (_("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?"));
+ 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 =
- nquery (_("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?"),
+ 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 (regno < 0)
{
int i;
+
for (i = 0;
i < gdbarch_num_regs (get_regcache_arch (regcache));
i++)
}
/* Destroy the record from here forward. */
- record_list_release_next ();
+ record_list_release_following (record_list);
}
record_registers_change (regcache, regno);
regcache, regno);
}
-/* Behavior is conditional on RECORD_IS_REPLAY.
+/* "to_xfer_partial" method. 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. */
if (RECORD_IS_REPLAY)
{
/* Let user choose if he wants to write memory or not. */
- if (!nquery (_("Because GDB is in replay mode, writing to memory "
- "will make the execution log unusable from this "
- "point onward. Write memory at address 0x%s?"),
- paddr_nz (offset)))
- return -1;
+ 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_next ();
+ record_list_release_following (record_list);
}
/* Check record_insn_num */
record_list_release (record_arch_list_tail);
if (record_debug)
fprintf_unfiltered (gdb_stdlog,
- _("Process record: failed to record "
- "execution log."));
+ "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."));
+ "Process record: failed to record "
+ "execution log.");
return -1;
}
record_list->next = record_arch_list_head;
offset, len);
}
-/* Behavior is conditional on RECORD_IS_REPLAY.
- We will not actually insert or remove breakpoints when replaying,
- nor when recording. */
+/* This structure represents a breakpoint inserted while the record
+ target is active. We use this to know when to install/remove
+ breakpoints in/from the target beneath. For example, a breakpoint
+ may be inserted while recording, but removed when not replaying nor
+ recording. In that case, the breakpoint had not been inserted on
+ the target beneath, so we should not try to remove it there. */
+
+struct record_breakpoint
+{
+ /* The address and address space the breakpoint was set at. */
+ struct address_space *address_space;
+ CORE_ADDR addr;
+
+ /* True when the breakpoint has been also installed in the target
+ beneath. This will be false for breakpoints set during replay or
+ when recording. */
+ int in_target_beneath;
+};
+
+typedef struct record_breakpoint *record_breakpoint_p;
+DEF_VEC_P(record_breakpoint_p);
+
+/* The list of breakpoints inserted while the record target is
+ active. */
+VEC(record_breakpoint_p) *record_breakpoints = NULL;
+
+static void
+record_sync_record_breakpoints (struct bp_location *loc, void *data)
+{
+ if (loc->loc_type != bp_loc_software_breakpoint)
+ return;
+
+ if (loc->inserted)
+ {
+ struct record_breakpoint *bp = XNEW (struct record_breakpoint);
+
+ bp->addr = loc->target_info.placed_address;
+ bp->address_space = loc->target_info.placed_address_space;
+
+ bp->in_target_beneath = 1;
+
+ VEC_safe_push (record_breakpoint_p, record_breakpoints, bp);
+ }
+}
+
+/* Sync existing breakpoints to record_breakpoints. */
+
+static void
+record_init_record_breakpoints (void)
+{
+ VEC_free (record_breakpoint_p, record_breakpoints);
+
+ iterate_over_bp_locations (record_sync_record_breakpoints);
+}
+
+/* Behavior is conditional on RECORD_IS_REPLAY. We will not actually
+ insert or remove breakpoints in the real target when replaying, nor
+ when recording. */
static int
-record_insert_breakpoint (struct bp_target_info *bp_tgt)
+record_insert_breakpoint (struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
{
+ struct record_breakpoint *bp;
+ int in_target_beneath = 0;
+
if (!RECORD_IS_REPLAY)
{
- struct cleanup *old_cleanups = record_gdb_operation_disable_set ();
- int ret = record_beneath_to_insert_breakpoint (bp_tgt);
-
+ /* When recording, we currently always single-step, so we don't
+ really need to install regular breakpoints in the inferior.
+ However, we do have to insert software single-step
+ breakpoints, in case the target can't hardware step. To keep
+ things single, we always insert. */
+ struct cleanup *old_cleanups;
+ int ret;
+
+ old_cleanups = record_gdb_operation_disable_set ();
+ ret = record_beneath_to_insert_breakpoint (gdbarch, bp_tgt);
do_cleanups (old_cleanups);
- return ret;
+ if (ret != 0)
+ return ret;
+
+ in_target_beneath = 1;
}
+ bp = XNEW (struct record_breakpoint);
+ bp->addr = bp_tgt->placed_address;
+ bp->address_space = bp_tgt->placed_address_space;
+ bp->in_target_beneath = in_target_beneath;
+ VEC_safe_push (record_breakpoint_p, record_breakpoints, bp);
return 0;
}
+/* "to_remove_breakpoint" method for process record target. */
+
static int
-record_remove_breakpoint (struct bp_target_info *bp_tgt)
+record_remove_breakpoint (struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
{
- if (!RECORD_IS_REPLAY)
+ struct record_breakpoint *bp;
+ int ix;
+
+ for (ix = 0;
+ VEC_iterate (record_breakpoint_p, record_breakpoints, ix, bp);
+ ++ix)
{
- struct cleanup *old_cleanups = record_gdb_operation_disable_set ();
- int ret = record_beneath_to_remove_breakpoint (bp_tgt);
+ if (bp->addr == bp_tgt->placed_address
+ && bp->address_space == bp_tgt->placed_address_space)
+ {
+ if (bp->in_target_beneath)
+ {
+ struct cleanup *old_cleanups;
+ int ret;
- do_cleanups (old_cleanups);
+ old_cleanups = record_gdb_operation_disable_set ();
+ ret = record_beneath_to_remove_breakpoint (gdbarch, bp_tgt);
+ do_cleanups (old_cleanups);
+
+ if (ret != 0)
+ return ret;
+ }
- return ret;
+ VEC_unordered_remove (record_breakpoint_p, record_breakpoints, ix);
+ return 0;
+ }
}
- return 0;
+ gdb_assert_not_reached ("removing unknown breakpoint");
}
+/* "to_can_execute_reverse" method for process record target. */
+
static int
record_can_execute_reverse (void)
{
return 1;
}
+/* "to_get_bookmark" method for process record and prec over core. */
+
+static gdb_byte *
+record_get_bookmark (char *args, int from_tty)
+{
+ gdb_byte *ret = NULL;
+
+ /* Return stringified form of instruction count. */
+ if (record_list && record_list->type == record_end)
+ ret = xstrdup (pulongest (record_list->u.end.insn_num));
+
+ if (record_debug)
+ {
+ if (ret)
+ fprintf_unfiltered (gdb_stdlog,
+ "record_get_bookmark returns %s\n", ret);
+ else
+ fprintf_unfiltered (gdb_stdlog,
+ "record_get_bookmark returns NULL\n");
+ }
+ return ret;
+}
+
+/* The implementation of the command "record goto". */
+static void cmd_record_goto (char *, int);
+
+/* "to_goto_bookmark" method for process record and prec over core. */
+
+static void
+record_goto_bookmark (gdb_byte *bookmark, int from_tty)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "record_goto_bookmark receives %s\n", bookmark);
+
+ if (bookmark[0] == '\'' || bookmark[0] == '\"')
+ {
+ if (bookmark[strlen (bookmark) - 1] != bookmark[0])
+ error (_("Unbalanced quotes: %s"), bookmark);
+
+ /* Strip trailing quote. */
+ bookmark[strlen (bookmark) - 1] = '\0';
+ /* Strip leading quote. */
+ bookmark++;
+ /* Pass along to cmd_record_goto. */
+ }
+
+ cmd_record_goto ((char *) bookmark, from_tty);
+ return;
+}
+
+static void
+record_async (void (*callback) (enum inferior_event_type event_type,
+ void *context), void *context)
+{
+ /* If we're on top of a line target (e.g., linux-nat, remote), then
+ set it to async mode as well. Will be NULL if we're sitting on
+ top of the core target, for "record restore". */
+ if (record_beneath_to_async != NULL)
+ record_beneath_to_async (callback, context);
+}
+
+static int
+record_can_async_p (void)
+{
+ /* We only enable async when the user specifically asks for it. */
+ return target_async_permitted;
+}
+
+static int
+record_is_async_p (void)
+{
+ /* We only enable async when the user specifically asks for it. */
+ return target_async_permitted;
+}
+
+static enum exec_direction_kind
+record_execution_direction (void)
+{
+ return record_execution_dir;
+}
+
static void
init_record_ops (void)
{
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_stopped_by_watchpoint = record_stopped_by_watchpoint;
+ record_ops.to_stopped_data_address = record_stopped_data_address;
record_ops.to_can_execute_reverse = record_can_execute_reverse;
record_ops.to_stratum = record_stratum;
+ /* Add bookmark target methods. */
+ record_ops.to_get_bookmark = record_get_bookmark;
+ record_ops.to_goto_bookmark = record_goto_bookmark;
+ record_ops.to_async = record_async;
+ record_ops.to_can_async_p = record_can_async_p;
+ record_ops.to_is_async_p = record_is_async_p;
+ record_ops.to_execution_direction = record_execution_direction;
record_ops.to_magic = OPS_MAGIC;
}
+/* "to_resume" method for prec over corefile. */
+
+static void
+record_core_resume (struct target_ops *ops, ptid_t ptid, int step,
+ enum gdb_signal signal)
+{
+ record_resume_step = step;
+ record_resumed = 1;
+ record_execution_dir = execution_direction;
+
+ /* We are about to start executing the inferior (or simulate it),
+ let's register it with the event loop. */
+ if (target_can_async_p ())
+ {
+ target_async (inferior_event_handler, 0);
+
+ /* Notify the event loop there's an event to wait for. */
+ mark_async_event_handler (record_async_inferior_event_token);
+ }
+}
+
+/* "to_kill" method for prec over corefile. */
+
+static void
+record_core_kill (struct target_ops *ops)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: record_core_kill\n");
+
+ unpush_target (&record_core_ops);
+}
+
+/* "to_fetch_registers" method for prec over corefile. */
+
+static void
+record_core_fetch_registers (struct target_ops *ops,
+ struct regcache *regcache,
+ int regno)
+{
+ if (regno < 0)
+ {
+ int num = gdbarch_num_regs (get_regcache_arch (regcache));
+ int i;
+
+ for (i = 0; i < num; i ++)
+ regcache_raw_supply (regcache, i,
+ record_core_regbuf + MAX_REGISTER_SIZE * i);
+ }
+ else
+ regcache_raw_supply (regcache, regno,
+ record_core_regbuf + MAX_REGISTER_SIZE * regno);
+}
+
+/* "to_prepare_to_store" method for prec over corefile. */
+
+static void
+record_core_prepare_to_store (struct regcache *regcache)
+{
+}
+
+/* "to_store_registers" method for prec over corefile. */
+
+static void
+record_core_store_registers (struct target_ops *ops,
+ struct regcache *regcache,
+ int regno)
+{
+ if (record_gdb_operation_disable)
+ regcache_raw_collect (regcache, regno,
+ record_core_regbuf + MAX_REGISTER_SIZE * regno);
+ else
+ error (_("You can't do that without a process to debug."));
+}
+
+/* "to_xfer_partial" method for prec over corefile. */
+
+static LONGEST
+record_core_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 (object == TARGET_OBJECT_MEMORY)
+ {
+ if (record_gdb_operation_disable || !writebuf)
+ {
+ struct target_section *p;
+
+ for (p = record_core_start; p < record_core_end; p++)
+ {
+ if (offset >= p->addr)
+ {
+ struct record_core_buf_entry *entry;
+ ULONGEST sec_offset;
+
+ if (offset >= p->endaddr)
+ continue;
+
+ if (offset + len > p->endaddr)
+ len = p->endaddr - offset;
+
+ sec_offset = offset - p->addr;
+
+ /* Read readbuf or write writebuf p, offset, len. */
+ /* Check flags. */
+ if (p->the_bfd_section->flags & SEC_CONSTRUCTOR
+ || (p->the_bfd_section->flags & SEC_HAS_CONTENTS) == 0)
+ {
+ if (readbuf)
+ memset (readbuf, 0, len);
+ return len;
+ }
+ /* Get record_core_buf_entry. */
+ for (entry = record_core_buf_list; entry;
+ entry = entry->prev)
+ if (entry->p == p)
+ break;
+ if (writebuf)
+ {
+ if (!entry)
+ {
+ /* Add a new entry. */
+ entry = (struct record_core_buf_entry *)
+ xmalloc (sizeof (struct record_core_buf_entry));
+ entry->p = p;
+ if (!bfd_malloc_and_get_section (p->bfd,
+ p->the_bfd_section,
+ &entry->buf))
+ {
+ xfree (entry);
+ return 0;
+ }
+ entry->prev = record_core_buf_list;
+ record_core_buf_list = entry;
+ }
+
+ memcpy (entry->buf + sec_offset, writebuf,
+ (size_t) len);
+ }
+ else
+ {
+ if (!entry)
+ return record_beneath_to_xfer_partial
+ (record_beneath_to_xfer_partial_ops,
+ object, annex, readbuf, writebuf,
+ offset, len);
+
+ memcpy (readbuf, entry->buf + sec_offset,
+ (size_t) len);
+ }
+
+ return len;
+ }
+ }
+
+ return -1;
+ }
+ else
+ error (_("You can't do that without a process to debug."));
+ }
+
+ return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops,
+ object, annex, readbuf, writebuf,
+ offset, len);
+}
+
+/* "to_insert_breakpoint" method for prec over corefile. */
+
+static int
+record_core_insert_breakpoint (struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
+{
+ return 0;
+}
+
+/* "to_remove_breakpoint" method for prec over corefile. */
+
+static int
+record_core_remove_breakpoint (struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
+{
+ return 0;
+}
+
+/* "to_has_execution" method for prec over corefile. */
+
+static int
+record_core_has_execution (struct target_ops *ops, ptid_t the_ptid)
+{
+ return 1;
+}
+
+static void
+init_record_core_ops (void)
+{
+ record_core_ops.to_shortname = "record-core";
+ record_core_ops.to_longname = "Process record and replay target";
+ record_core_ops.to_doc =
+ "Log program while executing and replay execution from log.";
+ record_core_ops.to_open = record_open;
+ record_core_ops.to_close = record_close;
+ record_core_ops.to_resume = record_core_resume;
+ record_core_ops.to_wait = record_wait;
+ record_core_ops.to_kill = record_core_kill;
+ record_core_ops.to_fetch_registers = record_core_fetch_registers;
+ record_core_ops.to_prepare_to_store = record_core_prepare_to_store;
+ record_core_ops.to_store_registers = record_core_store_registers;
+ record_core_ops.to_xfer_partial = record_core_xfer_partial;
+ record_core_ops.to_insert_breakpoint = record_core_insert_breakpoint;
+ record_core_ops.to_remove_breakpoint = record_core_remove_breakpoint;
+ record_core_ops.to_stopped_by_watchpoint = record_stopped_by_watchpoint;
+ record_core_ops.to_stopped_data_address = record_stopped_data_address;
+ record_core_ops.to_can_execute_reverse = record_can_execute_reverse;
+ record_core_ops.to_has_execution = record_core_has_execution;
+ record_core_ops.to_stratum = record_stratum;
+ /* Add bookmark target methods. */
+ record_core_ops.to_get_bookmark = record_get_bookmark;
+ record_core_ops.to_goto_bookmark = record_goto_bookmark;
+ record_core_ops.to_async = record_async;
+ record_core_ops.to_can_async_p = record_can_async_p;
+ record_core_ops.to_is_async_p = record_is_async_p;
+ record_core_ops.to_execution_direction = record_execution_direction;
+ record_core_ops.to_magic = OPS_MAGIC;
+}
+
+/* Implement "show record debug" command. */
+
static void
show_record_debug (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
if (!from_tty || query (_("Delete the log from this point forward "
"and begin to record the running message "
"at current PC?")))
- record_list_release_next ();
+ record_list_release_following (record_list);
}
else
printf_unfiltered (_("Already at end of record list.\n"));
printf_unfiltered (_("Process record is not started.\n"));
}
-/* Implement the "stoprecord" command. */
+/* Implement the "stoprecord" or "record stop" command. */
static void
cmd_record_stop (char *args, int from_tty)
{
if (current_target.to_stratum == record_stratum)
{
- if (!record_list || !from_tty || query (_("Delete recorded log and "
- "stop recording?")))
- unpush_target (&record_ops);
+ unpush_target (&record_ops);
+ printf_unfiltered (_("Process record is stopped and all execution "
+ "logs are deleted.\n"));
}
else
printf_unfiltered (_("Process record is not started.\n"));
{
if (record_insn_num > record_insn_max_num && record_insn_max_num)
{
- printf_unfiltered (_("Record instructions number is bigger than "
- "record instructions max number. Auto delete "
- "the first ones?\n"));
-
+ /* Count down record_insn_num while releasing records from list. */
while (record_insn_num > record_insn_max_num)
- record_list_release_first ();
+ {
+ 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"));
+ printf_unfiltered (_("\"set record\" must be followed "
+ "by an apporpriate subcommand.\n"));
help_list (set_record_cmdlist, "set record ", all_commands, gdb_stdout);
}
cmd_show_list (show_record_cmdlist, from_tty, "");
}
+/* Display some statistics about the execution log. */
+
static void
info_record_command (char *args, int from_tty)
{
- cmd_show_list (info_record_cmdlist, from_tty, "");
+ struct record_entry *p;
+
+ if (current_target.to_stratum == record_stratum)
+ {
+ if (RECORD_IS_REPLAY)
+ printf_filtered (_("Replay mode:\n"));
+ else
+ printf_filtered (_("Record mode:\n"));
+
+ /* Find entry for first actual instruction in the log. */
+ for (p = record_first.next;
+ p != NULL && p->type != record_end;
+ p = p->next)
+ ;
+
+ /* Do we have a log at all? */
+ if (p != NULL && p->type == record_end)
+ {
+ /* Display instruction number for first instruction in the log. */
+ printf_filtered (_("Lowest recorded instruction number is %s.\n"),
+ pulongest (p->u.end.insn_num));
+
+ /* If in replay mode, display where we are in the log. */
+ if (RECORD_IS_REPLAY)
+ printf_filtered (_("Current instruction number is %s.\n"),
+ pulongest (record_list->u.end.insn_num));
+
+ /* Display instruction number for last instruction in the log. */
+ printf_filtered (_("Highest recorded instruction number is %s.\n"),
+ pulongest (record_insn_count));
+
+ /* Display log count. */
+ printf_filtered (_("Log contains %d instructions.\n"),
+ record_insn_num);
+ }
+ else
+ {
+ printf_filtered (_("No instructions have been logged.\n"));
+ }
+ }
+ else
+ {
+ printf_filtered (_("target record is not active.\n"));
+ }
+
+ /* Display max log size. */
+ printf_filtered (_("Max logged instructions is %d.\n"),
+ record_insn_max_num);
+}
+
+/* Record log save-file format
+ Version 1 (never released)
+
+ Header:
+ 4 bytes: magic number htonl(0x20090829).
+ NOTE: be sure to change whenever this file format changes!
+
+ Records:
+ record_end:
+ 1 byte: record type (record_end, see enum record_type).
+ record_reg:
+ 1 byte: record type (record_reg, see enum record_type).
+ 8 bytes: register id (network byte order).
+ MAX_REGISTER_SIZE bytes: register value.
+ record_mem:
+ 1 byte: record type (record_mem, see enum record_type).
+ 8 bytes: memory length (network byte order).
+ 8 bytes: memory address (network byte order).
+ n bytes: memory value (n == memory length).
+
+ Version 2
+ 4 bytes: magic number netorder32(0x20091016).
+ NOTE: be sure to change whenever this file format changes!
+
+ Records:
+ record_end:
+ 1 byte: record type (record_end, see enum record_type).
+ 4 bytes: signal
+ 4 bytes: instruction count
+ record_reg:
+ 1 byte: record type (record_reg, see enum record_type).
+ 4 bytes: register id (network byte order).
+ n bytes: register value (n == actual register size).
+ (eg. 4 bytes for x86 general registers).
+ record_mem:
+ 1 byte: record type (record_mem, see enum record_type).
+ 4 bytes: memory length (network byte order).
+ 8 bytes: memory address (network byte order).
+ n bytes: memory value (n == memory length).
+
+*/
+
+/* bfdcore_read -- read bytes from a core file section. */
+
+static inline void
+bfdcore_read (bfd *obfd, asection *osec, void *buf, int len, int *offset)
+{
+ int ret = bfd_get_section_contents (obfd, osec, buf, *offset, len);
+
+ if (ret)
+ *offset += len;
+ else
+ error (_("Failed to read %d bytes from core file %s ('%s')."),
+ len, bfd_get_filename (obfd),
+ bfd_errmsg (bfd_get_error ()));
+}
+
+static inline uint64_t
+netorder64 (uint64_t input)
+{
+ uint64_t ret;
+
+ store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret),
+ BFD_ENDIAN_BIG, input);
+ return ret;
+}
+
+static inline uint32_t
+netorder32 (uint32_t input)
+{
+ uint32_t ret;
+
+ store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret),
+ BFD_ENDIAN_BIG, input);
+ return ret;
+}
+
+static inline uint16_t
+netorder16 (uint16_t input)
+{
+ uint16_t ret;
+
+ store_unsigned_integer ((gdb_byte *) &ret, sizeof (ret),
+ BFD_ENDIAN_BIG, input);
+ return ret;
}
+/* Restore the execution log from a core_bfd file. */
+static void
+record_restore (void)
+{
+ uint32_t magic;
+ struct cleanup *old_cleanups;
+ struct record_entry *rec;
+ asection *osec;
+ uint32_t osec_size;
+ int bfd_offset = 0;
+ struct regcache *regcache;
+
+ /* We restore the execution log from the open core bfd,
+ if there is one. */
+ if (core_bfd == NULL)
+ return;
+
+ /* "record_restore" can only be called when record list is empty. */
+ gdb_assert (record_first.next == NULL);
+
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Restoring recording from core file.\n");
+
+ /* Now need to find our special note section. */
+ osec = bfd_get_section_by_name (core_bfd, "null0");
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Find precord section %s.\n",
+ osec ? "succeeded" : "failed");
+ if (osec == NULL)
+ return;
+ osec_size = bfd_section_size (core_bfd, osec);
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "%s", bfd_section_name (core_bfd, osec));
+
+ /* Check the magic code. */
+ bfdcore_read (core_bfd, osec, &magic, sizeof (magic), &bfd_offset);
+ if (magic != RECORD_FILE_MAGIC)
+ error (_("Version mis-match or file format error in core file %s."),
+ bfd_get_filename (core_bfd));
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Reading 4-byte magic cookie "
+ "RECORD_FILE_MAGIC (0x%s)\n",
+ phex_nz (netorder32 (magic), 4));
+
+ /* Restore the entries in recfd into record_arch_list_head and
+ record_arch_list_tail. */
+ record_arch_list_head = NULL;
+ record_arch_list_tail = NULL;
+ record_insn_num = 0;
+ old_cleanups = make_cleanup (record_arch_list_cleanups, 0);
+ regcache = get_current_regcache ();
+
+ while (1)
+ {
+ uint8_t rectype;
+ uint32_t regnum, len, signal, count;
+ uint64_t addr;
+
+ /* We are finished when offset reaches osec_size. */
+ if (bfd_offset >= osec_size)
+ break;
+ bfdcore_read (core_bfd, osec, &rectype, sizeof (rectype), &bfd_offset);
+
+ switch (rectype)
+ {
+ case record_reg: /* reg */
+ /* Get register number to regnum. */
+ bfdcore_read (core_bfd, osec, ®num,
+ sizeof (regnum), &bfd_offset);
+ regnum = netorder32 (regnum);
+
+ rec = record_reg_alloc (regcache, regnum);
+
+ /* Get val. */
+ bfdcore_read (core_bfd, osec, record_get_loc (rec),
+ rec->u.reg.len, &bfd_offset);
+
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Reading register %d (1 "
+ "plus %lu plus %d bytes)\n",
+ rec->u.reg.num,
+ (unsigned long) sizeof (regnum),
+ rec->u.reg.len);
+ break;
+
+ case record_mem: /* mem */
+ /* Get len. */
+ bfdcore_read (core_bfd, osec, &len,
+ sizeof (len), &bfd_offset);
+ len = netorder32 (len);
+
+ /* Get addr. */
+ bfdcore_read (core_bfd, osec, &addr,
+ sizeof (addr), &bfd_offset);
+ addr = netorder64 (addr);
+
+ rec = record_mem_alloc (addr, len);
+
+ /* Get val. */
+ bfdcore_read (core_bfd, osec, record_get_loc (rec),
+ rec->u.mem.len, &bfd_offset);
+
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Reading memory %s (1 plus "
+ "%lu plus %lu plus %d bytes)\n",
+ paddress (get_current_arch (),
+ rec->u.mem.addr),
+ (unsigned long) sizeof (addr),
+ (unsigned long) sizeof (len),
+ rec->u.mem.len);
+ break;
+
+ case record_end: /* end */
+ rec = record_end_alloc ();
+ record_insn_num ++;
+
+ /* Get signal value. */
+ bfdcore_read (core_bfd, osec, &signal,
+ sizeof (signal), &bfd_offset);
+ signal = netorder32 (signal);
+ rec->u.end.sigval = signal;
+
+ /* Get insn count. */
+ bfdcore_read (core_bfd, osec, &count,
+ sizeof (count), &bfd_offset);
+ count = netorder32 (count);
+ rec->u.end.insn_num = count;
+ record_insn_count = count + 1;
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Reading record_end (1 + "
+ "%lu + %lu bytes), offset == %s\n",
+ (unsigned long) sizeof (signal),
+ (unsigned long) sizeof (count),
+ paddress (get_current_arch (),
+ bfd_offset));
+ break;
+
+ default:
+ error (_("Bad entry type in core file %s."),
+ bfd_get_filename (core_bfd));
+ break;
+ }
+
+ /* Add rec to record arch list. */
+ record_arch_list_add (rec);
+ }
+
+ discard_cleanups (old_cleanups);
+
+ /* Add record_arch_list_head to the end of record list. */
+ record_first.next = record_arch_list_head;
+ record_arch_list_head->prev = &record_first;
+ record_arch_list_tail->next = NULL;
+ record_list = &record_first;
+
+ /* Update record_insn_max_num. */
+ if (record_insn_num > record_insn_max_num)
+ {
+ record_insn_max_num = record_insn_num;
+ warning (_("Auto increase record/replay buffer limit to %d."),
+ record_insn_max_num);
+ }
+
+ /* Succeeded. */
+ printf_filtered (_("Restored records from core file %s.\n"),
+ bfd_get_filename (core_bfd));
+
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+}
+
+/* bfdcore_write -- write bytes into a core file section. */
+
+static inline void
+bfdcore_write (bfd *obfd, asection *osec, void *buf, int len, int *offset)
+{
+ int ret = bfd_set_section_contents (obfd, osec, buf, *offset, len);
+
+ if (ret)
+ *offset += len;
+ else
+ error (_("Failed to write %d bytes to core file %s ('%s')."),
+ len, bfd_get_filename (obfd),
+ bfd_errmsg (bfd_get_error ()));
+}
+
+/* Restore the execution log from a file. We use a modified elf
+ corefile format, with an extra section for our data. */
+
+static void
+cmd_record_restore (char *args, int from_tty)
+{
+ core_file_command (args, from_tty);
+ record_open (args, from_tty);
+}
+
+static void
+record_save_cleanups (void *data)
+{
+ bfd *obfd = data;
+ char *pathname = xstrdup (bfd_get_filename (obfd));
+
+ bfd_close (obfd);
+ unlink (pathname);
+ xfree (pathname);
+}
+
+/* Save the execution log to a file. We use a modified elf corefile
+ format, with an extra section for our data. */
+
+static void
+cmd_record_save (char *args, int from_tty)
+{
+ char *recfilename, recfilename_buffer[40];
+ struct record_entry *cur_record_list;
+ uint32_t magic;
+ struct regcache *regcache;
+ struct gdbarch *gdbarch;
+ struct cleanup *old_cleanups;
+ struct cleanup *set_cleanups;
+ bfd *obfd;
+ int save_size = 0;
+ asection *osec = NULL;
+ int bfd_offset = 0;
+
+ if (strcmp (current_target.to_shortname, "record") != 0)
+ error (_("This command can only be used with target 'record'.\n"
+ "Use 'target record' first.\n"));
+
+ if (args && *args)
+ recfilename = args;
+ else
+ {
+ /* Default recfile name is "gdb_record.PID". */
+ snprintf (recfilename_buffer, sizeof (recfilename_buffer),
+ "gdb_record.%d", PIDGET (inferior_ptid));
+ recfilename = recfilename_buffer;
+ }
+
+ /* Open the save file. */
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Saving execution log to core file '%s'\n",
+ recfilename);
+
+ /* Open the output file. */
+ obfd = create_gcore_bfd (recfilename);
+ old_cleanups = make_cleanup (record_save_cleanups, obfd);
+
+ /* Save the current record entry to "cur_record_list". */
+ cur_record_list = record_list;
+
+ /* Get the values of regcache and gdbarch. */
+ regcache = get_current_regcache ();
+ gdbarch = get_regcache_arch (regcache);
+
+ /* Disable the GDB operation record. */
+ set_cleanups = record_gdb_operation_disable_set ();
+
+ /* Reverse execute to the begin of record list. */
+ while (1)
+ {
+ /* Check for beginning and end of log. */
+ if (record_list == &record_first)
+ break;
+
+ record_exec_insn (regcache, gdbarch, record_list);
+
+ if (record_list->prev)
+ record_list = record_list->prev;
+ }
+
+ /* Compute the size needed for the extra bfd section. */
+ save_size = 4; /* magic cookie */
+ for (record_list = record_first.next; record_list;
+ record_list = record_list->next)
+ switch (record_list->type)
+ {
+ case record_end:
+ save_size += 1 + 4 + 4;
+ break;
+ case record_reg:
+ save_size += 1 + 4 + record_list->u.reg.len;
+ break;
+ case record_mem:
+ save_size += 1 + 4 + 8 + record_list->u.mem.len;
+ break;
+ }
+
+ /* Make the new bfd section. */
+ osec = bfd_make_section_anyway_with_flags (obfd, "precord",
+ SEC_HAS_CONTENTS
+ | SEC_READONLY);
+ if (osec == NULL)
+ error (_("Failed to create 'precord' section for corefile %s: %s"),
+ recfilename,
+ bfd_errmsg (bfd_get_error ()));
+ bfd_set_section_size (obfd, osec, save_size);
+ bfd_set_section_vma (obfd, osec, 0);
+ bfd_set_section_alignment (obfd, osec, 0);
+ bfd_section_lma (obfd, osec) = 0;
+
+ /* Save corefile state. */
+ write_gcore_file (obfd);
+
+ /* Write out the record log. */
+ /* Write the magic code. */
+ magic = RECORD_FILE_MAGIC;
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Writing 4-byte magic cookie "
+ "RECORD_FILE_MAGIC (0x%s)\n",
+ phex_nz (magic, 4));
+ bfdcore_write (obfd, osec, &magic, sizeof (magic), &bfd_offset);
+
+ /* Save the entries to recfd and forward execute to the end of
+ record list. */
+ record_list = &record_first;
+ while (1)
+ {
+ /* Save entry. */
+ if (record_list != &record_first)
+ {
+ uint8_t type;
+ uint32_t regnum, len, signal, count;
+ uint64_t addr;
+
+ type = record_list->type;
+ bfdcore_write (obfd, osec, &type, sizeof (type), &bfd_offset);
+
+ switch (record_list->type)
+ {
+ case record_reg: /* reg */
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Writing register %d (1 "
+ "plus %lu plus %d bytes)\n",
+ record_list->u.reg.num,
+ (unsigned long) sizeof (regnum),
+ record_list->u.reg.len);
+
+ /* Write regnum. */
+ regnum = netorder32 (record_list->u.reg.num);
+ bfdcore_write (obfd, osec, ®num,
+ sizeof (regnum), &bfd_offset);
+
+ /* Write regval. */
+ bfdcore_write (obfd, osec, record_get_loc (record_list),
+ record_list->u.reg.len, &bfd_offset);
+ break;
+
+ case record_mem: /* mem */
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Writing memory %s (1 plus "
+ "%lu plus %lu plus %d bytes)\n",
+ paddress (gdbarch,
+ record_list->u.mem.addr),
+ (unsigned long) sizeof (addr),
+ (unsigned long) sizeof (len),
+ record_list->u.mem.len);
+
+ /* Write memlen. */
+ len = netorder32 (record_list->u.mem.len);
+ bfdcore_write (obfd, osec, &len, sizeof (len), &bfd_offset);
+
+ /* Write memaddr. */
+ addr = netorder64 (record_list->u.mem.addr);
+ bfdcore_write (obfd, osec, &addr,
+ sizeof (addr), &bfd_offset);
+
+ /* Write memval. */
+ bfdcore_write (obfd, osec, record_get_loc (record_list),
+ record_list->u.mem.len, &bfd_offset);
+ break;
+
+ case record_end:
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ " Writing record_end (1 + "
+ "%lu + %lu bytes)\n",
+ (unsigned long) sizeof (signal),
+ (unsigned long) sizeof (count));
+ /* Write signal value. */
+ signal = netorder32 (record_list->u.end.sigval);
+ bfdcore_write (obfd, osec, &signal,
+ sizeof (signal), &bfd_offset);
+
+ /* Write insn count. */
+ count = netorder32 (record_list->u.end.insn_num);
+ bfdcore_write (obfd, osec, &count,
+ sizeof (count), &bfd_offset);
+ break;
+ }
+ }
+
+ /* Execute entry. */
+ record_exec_insn (regcache, gdbarch, record_list);
+
+ if (record_list->next)
+ record_list = record_list->next;
+ else
+ break;
+ }
+
+ /* Reverse execute to cur_record_list. */
+ while (1)
+ {
+ /* Check for beginning and end of log. */
+ if (record_list == cur_record_list)
+ break;
+
+ record_exec_insn (regcache, gdbarch, record_list);
+
+ if (record_list->prev)
+ record_list = record_list->prev;
+ }
+
+ do_cleanups (set_cleanups);
+ bfd_close (obfd);
+ discard_cleanups (old_cleanups);
+
+ /* Succeeded. */
+ printf_filtered (_("Saved core file %s with execution log.\n"),
+ recfilename);
+}
+
+/* record_goto_insn -- rewind the record log (forward or backward,
+ depending on DIR) to the given entry, changing the program state
+ correspondingly. */
+
+static void
+record_goto_insn (struct record_entry *entry,
+ enum exec_direction_kind dir)
+{
+ struct cleanup *set_cleanups = record_gdb_operation_disable_set ();
+ struct regcache *regcache = get_current_regcache ();
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+
+ /* Assume everything is valid: we will hit the entry,
+ and we will not hit the end of the recording. */
+
+ if (dir == EXEC_FORWARD)
+ record_list = record_list->next;
+
+ do
+ {
+ record_exec_insn (regcache, gdbarch, record_list);
+ if (dir == EXEC_REVERSE)
+ record_list = record_list->prev;
+ else
+ record_list = record_list->next;
+ } while (record_list != entry);
+ do_cleanups (set_cleanups);
+}
+
+/* "record goto" command. Argument is an instruction number,
+ as given by "info record".
+
+ Rewinds the recording (forward or backward) to the given instruction. */
+
+static void
+cmd_record_goto (char *arg, int from_tty)
+{
+ struct record_entry *p = NULL;
+ ULONGEST target_insn = 0;
+
+ if (arg == NULL || *arg == '\0')
+ error (_("Command requires an argument (insn number to go to)."));
+
+ if (strncmp (arg, "start", strlen ("start")) == 0
+ || strncmp (arg, "begin", strlen ("begin")) == 0)
+ {
+ /* Special case. Find first insn. */
+ for (p = &record_first; p != NULL; p = p->next)
+ if (p->type == record_end)
+ break;
+ if (p)
+ target_insn = p->u.end.insn_num;
+ }
+ else if (strncmp (arg, "end", strlen ("end")) == 0)
+ {
+ /* Special case. Find last insn. */
+ for (p = record_list; p->next != NULL; p = p->next)
+ ;
+ for (; p!= NULL; p = p->prev)
+ if (p->type == record_end)
+ break;
+ if (p)
+ target_insn = p->u.end.insn_num;
+ }
+ else
+ {
+ /* General case. Find designated insn. */
+ target_insn = parse_and_eval_long (arg);
+
+ for (p = &record_first; p != NULL; p = p->next)
+ if (p->type == record_end && p->u.end.insn_num == target_insn)
+ break;
+ }
+
+ if (p == NULL)
+ error (_("Target insn '%s' not found."), arg);
+ else if (p == record_list)
+ error (_("Already at insn '%s'."), arg);
+ else if (p->u.end.insn_num > record_list->u.end.insn_num)
+ {
+ printf_filtered (_("Go forward to insn number %s\n"),
+ pulongest (target_insn));
+ record_goto_insn (p, EXEC_FORWARD);
+ }
+ else
+ {
+ printf_filtered (_("Go backward to insn number %s\n"),
+ pulongest (target_insn));
+ record_goto_insn (p, EXEC_REVERSE);
+ }
+ registers_changed ();
+ reinit_frame_cache ();
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_record;
+
void
_initialize_record (void)
{
+ struct cmd_list_element *c;
+
/* Init record_first. */
record_first.prev = NULL;
record_first.next = NULL;
init_record_ops ();
add_target (&record_ops);
+ init_record_core_ops ();
+ add_target (&record_core_ops);
add_setshow_zinteger_cmd ("record", no_class, &record_debug,
_("Set debugging of record/replay feature."),
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);
+ c = add_prefix_cmd ("record", class_obscure, cmd_record_start,
+ _("Abbreviated form of \"target record\" command."),
+ &record_cmdlist, "record ", 0, &cmdlist);
+ set_cmd_completer (c, filename_completer);
+
add_com_alias ("rec", "record", class_obscure, 1);
add_prefix_cmd ("record", class_support, set_record_command,
_("Set record options"), &set_record_cmdlist,
"info record ", 0, &infolist);
add_alias_cmd ("rec", "record", class_obscure, 1, &infolist);
+ c = add_cmd ("save", class_obscure, cmd_record_save,
+ _("Save the execution log to a file.\n\
+Argument is optional filename.\n\
+Default filename is 'gdb_record.<process_id>'."),
+ &record_cmdlist);
+ set_cmd_completer (c, filename_completer);
+
+ c = add_cmd ("restore", class_obscure, cmd_record_restore,
+ _("Restore the execution log from a file.\n\
+Argument is filename. File must be created with 'record save'."),
+ &record_cmdlist);
+ set_cmd_completer (c, filename_completer);
add_cmd ("delete", class_obscure, cmd_record_delete,
_("Delete the rest of execution log and start recording it anew."),
/* Record instructions number limit command. */
add_setshow_boolean_cmd ("stop-at-limit", no_class,
- &record_stop_at_limit, _("\
+ &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\
+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_zinteger_cmd ("insn-number-max", no_class,
+ 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."), _("\
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);
+
+ add_cmd ("goto", class_obscure, cmd_record_goto, _("\
+Restore the program to its state at instruction number N.\n\
+Argument is instruction number, as shown by 'info record'."),
+ &record_cmdlist);
+
+ add_setshow_boolean_cmd ("memory-query", no_class,
+ &record_memory_query, _("\
+Set whether query if PREC cannot record memory change of next instruction."),
+ _("\
+Show whether query if PREC cannot record memory change of next instruction."),
+ _("\
+Default is OFF.\n\
+When ON, query if PREC cannot record memory change of next instruction."),
+ NULL, NULL,
+ &set_record_cmdlist, &show_record_cmdlist);
+
}
projects / thirdparty / binutils-gdb.git / blobdiff