/* Process record and replay target for GDB, the GNU debugger.
- Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 2008-2012 Free Software Foundation, Inc.
This file is part of GDB.
#include "record.h"
#include "elf-bfd.h"
#include "gcore.h"
+#include "event-loop.h"
+#include "inf-loop.h"
+#include "gdb_bfd.h"
#include <signal.h>
struct record_end_entry
{
- enum target_signal sigval;
+ enum gdb_signal sigval;
ULONGEST insn_num;
};
/* 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 *,
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. */
return 0;
}
+int
+record_read_memory (struct gdbarch *gdbarch,
+ CORE_ADDR memaddr, gdb_byte *myaddr,
+ ssize_t len)
+{
+ int ret = target_read_memory (memaddr, myaddr, len);
+
+ if (ret && record_debug)
+ printf_unfiltered (_("Process record: error reading memory "
+ "at addr %s len = %ld.\n"),
+ paddress (gdbarch, memaddr), (long) len);
+ return ret;
+}
+
/* Record the value of a region of memory whose address is ADDR and
length is LEN to record_arch_list. */
rec = record_mem_alloc (addr, len);
- if (target_read_memory (addr, record_get_loc (rec), len))
+ if (record_read_memory (target_gdbarch, addr, record_get_loc (rec), len))
{
- if (record_debug)
- fprintf_unfiltered (gdb_stdlog,
- "Process record: error reading memory at "
- "addr = %s len = %d.\n",
- paddress (target_gdbarch, addr), len);
record_mem_release (rec);
return -1;
}
"Process record: add end to arch list.\n");
rec = record_end_alloc ();
- rec->u.end.sigval = TARGET_SIGNAL_0;
+ rec->u.end.sigval = GDB_SIGNAL_0;
rec->u.end.insn_num = ++record_insn_count;
record_arch_list_add (rec);
record_arch_list, and add it to record_list. */
static int
-record_message (struct regcache *regcache, enum target_signal signal)
+record_message (struct regcache *regcache, enum gdb_signal signal)
{
int ret;
struct gdbarch *gdbarch = get_regcache_arch (regcache);
record_list->u.end.sigval = signal;
}
- if (signal == TARGET_SIGNAL_0
+ if (signal == GDB_SIGNAL_0
|| !gdbarch_process_record_signal_p (gdbarch))
ret = gdbarch_process_record (gdbarch,
regcache,
struct record_message_args {
struct regcache *regcache;
- enum target_signal signal;
+ enum gdb_signal signal;
};
static int
static int
record_message_wrapper_safe (struct regcache *regcache,
- enum target_signal signal)
+ enum gdb_signal signal)
{
struct record_message_args args;
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);
- }
+ if (record_read_memory (gdbarch,
+ entry->u.mem.addr, mem, entry->u.mem.len))
+ entry->u.mem.mem_entry_not_accessible = 1;
else
{
if (target_write_memory (entry->u.mem.addr,
static struct target_ops *tmp_to_resume_ops;
static void (*tmp_to_resume) (struct target_ops *, ptid_t, int,
- enum target_signal);
+ 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 *,
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_async_inferior_event_handler (gdb_client_data data)
+{
+ inferior_event_handler (INF_REG_EVENT, NULL);
+}
+
/* Open the process record target. */
static void
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 "
push_target (&record_ops);
}
+static void record_init_record_breakpoints (void);
+
/* "to_open" target method. Open the process record target. */
static void
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)
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 (!tmp_to_xfer_partial)
error (_("Could not find 'to_xfer_partial' method on the target stack."));
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. */
}
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;
+/* 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 signal)
+ enum gdb_signal signal)
{
record_resume_step = step;
+ record_resumed = 1;
+ record_execution_dir = execution_direction;
if (!RECORD_IS_REPLAY)
{
}
}
+ /* Make sure the target beneath reports all signals. */
+ target_pass_signals (0, NULL);
+
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;
where to stop. */
static ptid_t
-record_wait (struct target_ops *ops,
- ptid_t ptid, struct target_waitstatus *status,
- int options)
+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_resumed)
+ {
+ 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);
{
ret = record_beneath_to_wait (record_beneath_to_wait_ops,
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;
+ return ret;
/* Is this a SIGTRAP? */
if (status->kind == TARGET_WAITKIND_STOPPED
- && status->value.sig == TARGET_SIGNAL_TRAP)
+ && status->value.sig == GDB_SIGNAL_TRAP)
{
struct regcache *regcache;
struct address_space *aspace;
int step = 1;
if (!record_message_wrapper_safe (regcache,
- TARGET_SIGNAL_0))
+ GDB_SIGNAL_0))
{
status->kind = TARGET_WAITKIND_STOPPED;
- status->value.sig = TARGET_SIGNAL_0;
+ status->value.sig = GDB_SIGNAL_0;
break;
}
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, step,
- TARGET_SIGNAL_0);
+ GDB_SIGNAL_0);
continue;
}
}
continue_flag = 0;
}
/* Check target signal */
- if (record_list->u.end.sigval != TARGET_SIGNAL_0)
+ if (record_list->u.end.sigval != GDB_SIGNAL_0)
/* FIXME: better way to check */
continue_flag = 0;
}
replay_out:
if (record_get_sig)
- status->value.sig = TARGET_SIGNAL_INT;
- else if (record_list->u.end.sigval != TARGET_SIGNAL_0)
+ 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);
}
return inferior_ptid;
}
+static ptid_t
+record_wait (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *status,
+ int options)
+{
+ ptid_t return_ptid;
+
+ 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)
{
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 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 (gdbarch, 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;
}
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 (gdbarch, 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. */
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)
{
/* 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;
}
static void
record_core_resume (struct target_ops *ops, ptid_t ptid, int step,
- enum target_signal signal)
+ 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. */
/* 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;
}
bfd *obfd = data;
char *pathname = xstrdup (bfd_get_filename (obfd));
- bfd_close (obfd);
+ gdb_bfd_unref (obfd);
unlink (pathname);
xfree (pathname);
}
}
do_cleanups (set_cleanups);
- bfd_close (obfd);
+ gdb_bfd_unref (obfd);
discard_cleanups (old_cleanups);
/* Succeeded. */
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)
{
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