Re: [RFA] Submit process record and replay third time, 3/9

teawater
2009-02-23T08:56:56Z

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Hi Pedro,

3-record_target.txt patch update follow your "Modernize solaris
threads support" patch.

Thanks,
Hui

On Tue, Feb 17, 2009 at 15:01, teawater <teawater@gmail.com> wrote:
> Update follow the cvs-head. It just has a very small change - add a 0
> to be the argument of observer_notify_normal_stop.
>
> On Sun, Feb 8, 2009 at 21:03, teawater <teawater@gmail.com> wrote:
>> Hi Pedro,
>>
>> According to your mail "Get rid of linux-thread-db.c:target_beneath".
>> I get ride of this global beneath function pointers.
>>
>> Do you think this patch is OK?
>>
>> Thanks,
>> Hui
>>
>

[-- Attachment #2: 3-record_target.txt --]
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---
Makefile.in | 4
record.c | 1283 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
record.h | 87 ++++
3 files changed, 1372 insertions(+), 2 deletions(-)

--- a/Makefile.in
+++ b/Makefile.in
@@ -662,7 +662,7 @@ SFILES = ada-exp.y ada-lang.c ada-typepr
valarith.c valops.c valprint.c value.c varobj.c vec.c \
wrapper.c \
xml-tdesc.c xml-support.c \
- inferior.c
+ inferior.c record.c

LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c

@@ -813,7 +813,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $
solib.o solib-null.o \
prologue-value.o memory-map.o xml-support.o \
target-descriptions.o target-memory.o xml-tdesc.o xml-builtin.o \
- inferior.o osdata.o
+ inferior.o osdata.o record.o

TSOBS = inflow.o

--- /dev/null
+++ b/record.c
@@ -0,0 +1,1283 @@
+/* Process record and replay target for GDB, the GNU debugger.
+
+ Copyright (C) 2008 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "target.h"
+#include "gdbcmd.h"
+#include "regcache.h"
+#include "inferior.h"
+#include "gdbthread.h"
+#include "event-top.h"
+#include "annotate.h"
+#include "observer.h"
+#include "record.h"
+
+#include <signal.h>
+
+#define DEFAULT_RECORD_INSN_MAX_NUM 200000
+
+int record_debug = 0;
+
+record_t record_first;
+record_t *record_list = &record_first;
+record_t *record_arch_list_head = NULL;
+record_t *record_arch_list_tail = NULL;
+struct regcache *record_regcache = NULL;
+
+/* 1 ask user. 0 auto delete the last record_t. */
+static int record_stop_at_limit = 1;
+static int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM;
+static int record_insn_num = 0;
+
+struct target_ops record_ops;
+static int record_resume_step = 0;
+static enum target_signal record_resume_siggnal;
+static int record_get_sig = 0;
+static sigset_t record_maskall;
+static int record_gdb_operation_disable = 0;
+int record_will_store_registers = 0;
+
+extern struct bp_location *bp_location_chain;
+
+/* The beneath function pointers. */
+static struct target_ops *record_beneath_to_resume_ops = NULL;
+static void (*record_beneath_to_resume) (struct target_ops *, ptid_t, int,
+ enum target_signal) = NULL;
+static struct target_ops *record_beneath_to_wait_ops = NULL;
+static ptid_t (*record_beneath_to_wait) (struct target_ops *, ptid_t,
+ struct target_waitstatus *) = NULL;
+static struct target_ops *record_beneath_to_store_registers_ops = NULL;
+static void (*record_beneath_to_store_registers) (struct target_ops *,
+ struct regcache *,
+ int regno) = NULL;
+static struct target_ops *record_beneath_to_xfer_partial_ops = NULL;
+static LONGEST (*record_beneath_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) = NULL;
+static int (*record_beneath_to_insert_breakpoint) (struct bp_target_info *) =
+ NULL;
+static int (*record_beneath_to_remove_breakpoint) (struct bp_target_info *) =
+ NULL;
+
+static void
+record_list_release (record_t * rec)
+{
+ record_t *tmp;
+
+ if (!rec)
+ return;
+
+ while (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);
+ }
+
+ if (rec != &record_first)
+ xfree (rec);
+}
+
+static void
+record_list_release_next (void)
+{
+ record_t *rec = record_list;
+ record_t *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);
+ tmp = rec;
+ }
+}
+
+static void
+record_list_release_first (void)
+{
+ record_t *tmp = NULL;
+ enum record_type type;
+
+ if (!record_first.next)
+ return;
+
+ 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);
+ tmp = record_first.next;
+ record_first.next = tmp->next;
+ xfree (tmp);
+
+ if (!record_first.next)
+ {
+ gdb_assert (record_insn_num == 1);
+ break;
+ }
+
+ record_first.next->prev = &record_first;
+
+ if (type == record_end)
+ break;
+ }
+
+ record_insn_num--;
+}
+
+/* Add a record_t to record_arch_list. */
+static void
+record_arch_list_add (record_t * rec)
+{
+ if (record_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: record_arch_list_add %s.\n",
+ host_address_to_string (rec));
+
+ if (record_arch_list_tail)
+ {
+ record_arch_list_tail->next = rec;
+ rec->prev = record_arch_list_tail;
+ record_arch_list_tail = rec;
+ }
+ else
+ {
+ record_arch_list_head = rec;
+ record_arch_list_tail = rec;
+ }
+}
+
+/* Record the value of a register ("num") to record_arch_list. */
+int
+record_arch_list_add_reg (int num)
+{
+ record_t *rec;
+
+ if (record_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: add register num = %d to "
+ "record list.\n",
+ num);
+
+ rec = (record_t *) xmalloc (sizeof (record_t));
+ 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;
+
+ regcache_raw_read (record_regcache, num, rec->u.reg.val);
+
+ record_arch_list_add (rec);
+
+ return 0;
+}
+
+/* Record the value of a region of memory whose address is "addr" and
+ length is "len" to record_arch_list. */
+
+int
+record_arch_list_add_mem (CORE_ADDR addr, int len)
+{
+ record_t *rec;
+
+ if (record_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: add mem addr = 0x%s len = %d to "
+ "record list.\n",
+ paddr_nz (addr), len);
+
+ if (!addr)
+ return 0;
+
+ rec = (record_t *) xmalloc (sizeof (record_t));
+ 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;
+
+ if (target_read_memory (addr, rec->u.mem.val, 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);
+ return -1;
+ }
+
+ record_arch_list_add (rec);
+
+ return 0;
+}
+
+/* Add a record_end type record_t to record_arch_list. */
+int
+record_arch_list_add_end (int need_dasm)
+{
+ record_t *rec;
+
+ if (record_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: add end need_dasm = %d to "
+ "arch list.\n",
+ need_dasm);
+
+ rec = (record_t *) xmalloc (sizeof (record_t));
+ rec->prev = NULL;
+ rec->next = NULL;
+ rec->type = record_end;
+
+ rec->u.need_dasm = need_dasm;
+
+ record_arch_list_add (rec);
+
+ return 0;
+}
+
+static void
+record_check_insn_num (int set_terminal)
+{
+ if (record_insn_max_num)
+ {
+ gdb_assert (record_insn_num <= record_insn_max_num);
+ if (record_insn_num == record_insn_max_num)
+ {
+ /* Ask user what to do. */
+ if (record_stop_at_limit)
+ {
+ int q;
+ if (set_terminal)
+ target_terminal_ours ();
+ q = yquery (_("Do you want to auto delete previous execution "
+ "log entries when record/replay buffer becomes "
+ "full (record-stop-at-limit)?"));
+ if (set_terminal)
+ target_terminal_inferior ();
+ if (q)
+ record_stop_at_limit = 0;
+ else
+ error (_("Process record: inferior program stopped."));
+ }
+ }
+ }
+}
+
+static void
+record_normal_stop (void)
+{
+ finish_thread_state (minus_one_ptid);
+
+ if (!breakpoints_always_inserted_mode () && target_has_execution)
+ remove_breakpoints ();
+
+ target_terminal_ours ();
+
+ if (target_has_stack && !stop_stack_dummy)
+ set_current_sal_from_frame (get_current_frame (), 1);
+
+ select_frame (get_current_frame ());
+
+ annotate_stopped ();
+ if (!suppress_stop_observer)
+ {
+ if (!ptid_equal (inferior_ptid, null_ptid))
+ observer_notify_normal_stop (inferior_thread ()->stop_bpstat, 0);
+ else
+ observer_notify_normal_stop (NULL, 0);
+ }
+}
+
+/* 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);
+ set_executing (inferior_ptid, 0);
+ record_normal_stop ();
+}
+
+void
+record_message (struct gdbarch *gdbarch)
+{
+ int ret;
+ struct cleanup *old_cleanups = make_cleanup (record_message_cleanups, 0);
+
+ record_arch_list_head = NULL;
+ record_arch_list_tail = NULL;
+
+ /* Check record_insn_num. */
+ record_check_insn_num (1);
+
+ record_regcache = get_current_regcache ();
+
+ ret = gdbarch_process_record (gdbarch,
+ regcache_read_pc (record_regcache));
+ if (ret > 0)
+ error (_("Process record: inferior program stopped."));
+ if (ret < 0)
+ error (_("Process record: failed to record execution log."));
+
+ discard_cleanups (old_cleanups);
+
+ record_list->next = record_arch_list_head;
+ record_arch_list_head->prev = record_list;
+ record_list = record_arch_list_tail;
+
+ if (record_insn_num == record_insn_max_num && record_insn_max_num)
+ record_list_release_first ();
+ else
+ record_insn_num++;
+}
+
+/* Things to clean up if we error or QUIT out of function that set
+ record_gdb_operation_disable (ie. command that caused target_wait to
+ be called). */
+static void
+record_gdb_operation_disable_cleanups (void *ignore)
+{
+ record_gdb_operation_disable = 0;
+}
+
+struct cleanup *
+record_gdb_operation_disable_set (void)
+{
+ struct cleanup *old_cleanups =
+ make_cleanup (record_gdb_operation_disable_cleanups, 0);
+ record_gdb_operation_disable = 1;
+
+ return old_cleanups;
+}
+
+static void
+record_open (char *name, int from_tty)
+{
+ struct target_ops *t;
+
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: record_open\n");
+
+ /* check exec */
+ if (!target_has_execution)
+ error (_("Process record: the program is not being run."));
+ if (non_stop)
+ error (_("Process record target can't debug inferior in non-stop mode "
+ "(non-stop)."));
+ if (target_async_permitted)
+ error (_("Process record target can't debug inferior in asynchronous "
+ "mode (target-async)."));
+
+ if (!gdbarch_process_record_p (current_gdbarch))
+ error (_("Process record: the current architecture doesn't support "
+ "record function."));
+
+ /* Check if record target is already running. */
+ if (TARGET_IS_PROCESS_RECORD)
+ {
+ if (!nquery
+ (_("Process record target already running, do you want to delete "
+ "the old record log?")))
+ return;
+ }
+
+ /* Set the beneath function pointers. */
+ for (t = current_target.beneath; t != NULL; t = t->beneath)
+ {
+ if (!record_beneath_to_resume)
+ {
+ record_beneath_to_resume = t->to_resume;
+ record_beneath_to_resume_ops = t;
+ }
+ if (!record_beneath_to_wait)
+ {
+ record_beneath_to_wait = t->to_wait;
+ record_beneath_to_wait_ops = t;
+ }
+ if (!record_beneath_to_store_registers)
+ {
+ record_beneath_to_store_registers = t->to_store_registers;
+ record_beneath_to_store_registers_ops = t;
+ }
+ if (!record_beneath_to_xfer_partial)
+ {
+ record_beneath_to_xfer_partial = t->to_xfer_partial;
+ record_beneath_to_xfer_partial_ops = t;
+ }
+ if (!record_beneath_to_insert_breakpoint)
+ record_beneath_to_insert_breakpoint = t->to_insert_breakpoint;
+ if (!record_beneath_to_remove_breakpoint)
+ record_beneath_to_remove_breakpoint = t->to_remove_breakpoint;
+ }
+ if (!record_beneath_to_resume)
+ error (_("Process record can't get to_resume."));
+ if (!record_beneath_to_wait)
+ error (_("Process record can't get to_wait."));
+ if (!record_beneath_to_store_registers)
+ error (_("Process record can't get to_store_registers."));
+ if (!record_beneath_to_xfer_partial)
+ error (_("Process record can't get to_xfer_partial."));
+ if (!record_beneath_to_insert_breakpoint)
+ error (_("Process record can't get to_insert_breakpoint."));
+ if (!record_beneath_to_remove_breakpoint)
+ error (_("Process record can't get to_remove_breakpoint."));
+
+ push_target (&record_ops);
+
+ /* Reset */
+ record_insn_num = 0;
+ record_list = &record_first;
+ record_list->next = NULL;
+}
+
+static void
+record_close (int quitting)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: record_close\n");
+
+ record_list_release (record_list);
+}
+
+static void
+record_resume (struct target_ops *ops, ptid_t ptid, int step,
+ enum target_signal siggnal)
+{
+ record_resume_step = step;
+ record_resume_siggnal = siggnal;
+
+ if (!RECORD_IS_REPLAY)
+ {
+ record_message (current_gdbarch);
+ record_beneath_to_resume (record_beneath_to_resume_ops, ptid, 1,
+ siggnal);
+ }
+}
+
+static void
+record_sig_handler (int signo)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: get a signal\n");
+
+ record_resume_step = 1;
+ record_get_sig = 1;
+}
+
+static void
+record_wait_cleanups (void *ignore)
+{
+ if (execution_direction == EXEC_REVERSE)
+ {
+ if (record_list->next)
+ record_list = record_list->next;
+ }
+ else
+ record_list = record_list->prev;
+
+ set_executing (inferior_ptid, 0);
+ record_normal_stop ();
+}
+
+/* record_wait
+ In replay mode, this function examines the recorded log and
+ determines where to stop. */
+
+static ptid_t
+record_wait (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *status)
+{
+ struct cleanup *set_cleanups = record_gdb_operation_disable_set ();
+
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: record_wait "
+ "record_resume_step = %d\n",
+ record_resume_step);
+
+ if (!RECORD_IS_REPLAY)
+ {
+ if (record_resume_step)
+ {
+ /* This is a single step. */
+ return record_beneath_to_wait (record_beneath_to_wait_ops,
+ ptid, status);
+ }
+ else
+ {
+ if (record_resume_step)
+ {
+ /* This is a single step. */
+ return record_beneath_to_wait (record_beneath_to_wait_ops,
+ ptid, status);
+ }
+ else
+ {
+ /* This is not a single step. */
+ ptid_t ret;
+ int is_breakpoint = 1;
+ CORE_ADDR pc = 0;
+ int pc_is_read = 0;
+ struct bp_location *bl;
+ struct breakpoint *b;
+
+ do
+ {
+ ret = record_beneath_to_wait (record_beneath_to_wait_ops,
+ ptid, status);
+
+ if (status->kind == TARGET_WAITKIND_STOPPED
+ && status->value.sig == TARGET_SIGNAL_TRAP)
+ {
+ /* Check if there is a breakpoint. */
+ pc_is_read = 0;
+ registers_changed ();
+ for (bl = bp_location_chain; bl; bl = bl->global_next)
+ {
+ b = bl->owner;
+ gdb_assert (b);
+ if (b->enable_state != bp_enabled
+ && b->enable_state != bp_permanent)
+ continue;
+ if (!pc_is_read)
+ {
+ pc =
+ regcache_read_pc (get_thread_regcache (ret));
+ pc_is_read = 1;
+ }
+ switch (b->type)
+ {
+ default:
+ if (bl->address == pc)
+ goto breakpoint;
+ break;
+
+ case bp_watchpoint:
+ /* XXX teawater: I still not very clear how to
+ deal with it. */
+ goto breakpoint;
+ break;
+
+ case bp_catchpoint:
+ gdb_assert (b->ops != NULL
+ && b->ops->breakpoint_hit != NULL);
+ if (b->ops->breakpoint_hit (b))
+ goto breakpoint;
+ break;
+
+ case bp_hardware_watchpoint:
+ case bp_read_watchpoint:
+ case bp_access_watchpoint:
+ if (STOPPED_BY_WATCHPOINT (0))
+ goto breakpoint;
+ break;
+ }
+ }
+
+ /* There is not a breakpoint. */
+ record_message (current_gdbarch);
+ record_beneath_to_resume (record_beneath_to_resume_ops,
+ ptid, 1,
+ record_resume_siggnal);
+ continue;
+ }
+
+ is_breakpoint = 0;
+
+ breakpoint:
+ /* Add gdbarch_decr_pc_after_break to pc because gdb will
+ expect the pc to be at address plus decr_pc_after_break
+ when the inferior stops at a breakpoint. */
+ if (is_breakpoint)
+ {
+ CORE_ADDR decr_pc_after_break =
+ gdbarch_decr_pc_after_break (current_gdbarch);
+ if (decr_pc_after_break)
+ {
+ if (!pc_is_read)
+ pc =
+ regcache_read_pc (get_thread_regcache (ret));
+ regcache_write_pc (get_thread_regcache (ret),
+ pc + decr_pc_after_break);
+ }
+ }
+
+ break;
+ }
+ while (1);
+
+ return ret;
+ }
+ }
+ }
+ else
+ {
+ int need_dasm = 0;
+ struct regcache *regcache = get_current_regcache ();
+ int continue_flag = 1;
+ int first_record_end = 1;
+ struct cleanup *old_cleanups = make_cleanup (record_wait_cleanups, 0);
+ CORE_ADDR tmp_pc;
+
+ status->kind = TARGET_WAITKIND_STOPPED;
+
+ /* Check breakpoint when forward execute. */
+ if (execution_direction == EXEC_FORWARD)
+ {
+ tmp_pc = regcache_read_pc (regcache);
+ if (breakpoint_inserted_here_p (tmp_pc))
+ {
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: break at 0x%s.\n",
+ paddr_nz (tmp_pc));
+ if (gdbarch_decr_pc_after_break (get_regcache_arch (regcache))
+ && !record_resume_step)
+ regcache_write_pc (regcache,
+ tmp_pc +
+ gdbarch_decr_pc_after_break
+ (get_regcache_arch (regcache)));
+ goto replay_out;
+ }
+ }
+
+ record_get_sig = 0;
+ signal (SIGINT, record_sig_handler);
+ /* If GDB is in terminal_inferior mode, it will not get the signal.
+ And in GDB replay mode, GDB doesn't need to be in terminal_inferior
+ mode, because inferior will not executed.
+ Then set it to terminal_ours to make GDB get the signal. */
+ target_terminal_ours ();
+
+ /* In EXEC_FORWARD mode, record_list points to the tail of prev
+ instruction. */
+ if (execution_direction == EXEC_FORWARD && record_list->next)
+ record_list = record_list->next;
+
+ /* Loop over the record_list, looking for the next place to
+ stop. */
+ do
+ {
+ /* Check for beginning and end of log. */
+ if (execution_direction == EXEC_REVERSE
+ && record_list == &record_first)
+ {
+ /* Hit beginning of record log in reverse. */
+ status->kind = TARGET_WAITKIND_NO_HISTORY;
+ break;
+ }
+ if (execution_direction != EXEC_REVERSE && !record_list->next)
+ {
+ /* Hit end of record log going forward. */
+ status->kind = TARGET_WAITKIND_NO_HISTORY;
+ break;
+ }
+
+ /* Set ptid, register and memory according to record_list. */
+ if (record_list->type == record_reg)
+ {
+ /* reg */
+ gdb_byte reg[MAX_REGISTER_SIZE];
+ if (record_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: record_reg %s to "
+ "inferior num = %d.\n",
+ host_address_to_string (record_list),
+ record_list->u.reg.num);
+ regcache_cooked_read (regcache, record_list->u.reg.num, reg);
+ regcache_cooked_write (regcache, record_list->u.reg.num,
+ record_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);
+
+ 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_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: record_end %s to "
+ "inferior need_dasm = %d.\n",
+ host_address_to_string (record_list),
+ record_list->u.need_dasm);
+
+ if (execution_direction == EXEC_FORWARD)
+ need_dasm = record_list->u.need_dasm;
+ if (need_dasm)
+ gdbarch_process_record_dasm (current_gdbarch);
+
+ if (first_record_end && execution_direction == EXEC_REVERSE)
+ {
+ /* When reverse excute, the first record_end is the part of
+ current instruction. */
+ first_record_end = 0;
+ }
+ else
+ {
+ /* In EXEC_REVERSE mode, this is the record_end of prev
+ instruction.
+ In EXEC_FORWARD mode, this is the record_end of current
+ instruction. */
+ /* step */
+ if (record_resume_step)
+ {
+ if (record_debug > 1)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: step.\n");
+ continue_flag = 0;
+ }
+
+ /* check breakpoint */
+ tmp_pc = regcache_read_pc (regcache);
+ if (breakpoint_inserted_here_p (tmp_pc))
+ {
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "Process record: break "
+ "at 0x%s.\n",
+ paddr_nz (tmp_pc));
+ if (gdbarch_decr_pc_after_break (get_regcache_arch (regcache))
+ && execution_direction == EXEC_FORWARD
+ && !record_resume_step)
+ regcache_write_pc (regcache,
+ tmp_pc +
+ gdbarch_decr_pc_after_break
+ (get_regcache_arch (regcache)));
+ continue_flag = 0;
+ }
+ }
+ if (execution_direction == EXEC_REVERSE)
+ need_dasm = record_list->u.need_dasm;
+ }
+
+next:
+ if (continue_flag)
+ {
+ if (execution_direction == EXEC_REVERSE)
+ {
+ if (record_list->prev)
+ record_list = record_list->prev;
+ }
+ else
+ {
+ if (record_list->next)
+ record_list = record_list->next;
+ }
+ }
+ }
+ while (continue_flag);
+
+ signal (SIGINT, handle_sigint);
+
+replay_out:
+ if (record_get_sig)
+ status->value.sig = TARGET_SIGNAL_INT;
+ else
+ status->value.sig = TARGET_SIGNAL_TRAP;
+
+ discard_cleanups (old_cleanups);
+ }
+
+ do_cleanups (set_cleanups);
+ return inferior_ptid;
+}
+
+static void
+record_disconnect (struct target_ops *target, char *args, int from_tty)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: record_disconnect\n");
+
+ unpush_target (&record_ops);
+ target_disconnect (args, from_tty);
+}
+
+static void
+record_detach (struct target_ops *ops, char *args, int from_tty)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: record_detach\n");
+
+ unpush_target (&record_ops);
+ target_detach (args, from_tty);
+}
+
+static void
+record_mourn_inferior (struct target_ops *ops)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: "
+ "record_mourn_inferior\n");
+
+ unpush_target (&record_ops);
+ target_mourn_inferior ();
+}
+
+/* Close process record target before killing the inferior process. */
+static void
+record_kill (void)
+{
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog, "Process record: record_kill\n");
+
+ unpush_target (&record_ops);
+ target_kill ();
+}
+
+/* Record registers change (by user or by GDB) to list as an instruction. */
+static void
+record_registers_change (struct regcache *regcache, int regnum)
+{
+ /* Check record_insn_num. */
+ record_check_insn_num (0);
+
+ record_arch_list_head = NULL;
+ record_arch_list_tail = NULL;
+
+ record_regcache = get_current_regcache ();
+
+ if (regnum < 0)
+ {
+ int i;
+ for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
+ {
+ if (record_arch_list_add_reg (i))
+ {
+ record_list_release (record_arch_list_tail);
+ error (_("Process record: failed to record execution log."));
+ }
+ }
+ }
+ else
+ {
+ if (record_arch_list_add_reg (regnum))
+ {
+ record_list_release (record_arch_list_tail);
+ error (_("Process record: failed to record execution log."));
+ }
+ }
+ if (record_arch_list_add_end (0))
+ {
+ record_list_release (record_arch_list_tail);
+ error (_("Process record: failed to record execution log."));
+ }
+ record_list->next = record_arch_list_head;
+ record_arch_list_head->prev = record_list;
+ record_list = record_arch_list_tail;
+
+ if (record_insn_num == record_insn_max_num && record_insn_max_num)
+ record_list_release_first ();
+ else
+ record_insn_num++;
+}
+
+static void
+record_store_registers (struct target_ops *ops, struct regcache *regcache,
+ int regno)
+{
+ if (!record_gdb_operation_disable)
+ {
+ if (RECORD_IS_REPLAY)
+ {
+ int n;
+ 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?"));
+ 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?"),
+ gdbarch_register_name (get_regcache_arch (regcache),
+ regno));
+
+ if (!n)
+ {
+ /* Invalidate the value of regcache that was set in function
+ "regcache_raw_write". */
+ if (regno < 0)
+ {
+ int i;
+ for (i = 0;
+ i < gdbarch_num_regs (get_regcache_arch (regcache));
+ i++)
+ regcache_invalidate (regcache, i);
+ }
+ else
+ regcache_invalidate (regcache, regno);
+
+ error (_("Process record canceled the operation."));
+ }
+
+ /* Destroy the record from here forward. */
+ record_list_release_next ();
+ }
+
+ record_registers_change (regcache, regno);
+ }
+ record_beneath_to_store_registers (record_beneath_to_store_registers_ops,
+ regcache, regno);
+}
+
+/* record_xfer_partial -- behavior is conditional on RECORD_IS_REPLAY.
+ In replay mode, we cannot write memory unles we are willing to
+ invalidate the record/replay log from this point forward. */
+
+static LONGEST
+record_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte * readbuf,
+ const gdb_byte * writebuf, ULONGEST offset, LONGEST len)
+{
+ if (!record_gdb_operation_disable
+ && (object == TARGET_OBJECT_MEMORY
+ || object == TARGET_OBJECT_RAW_MEMORY) && writebuf)
+ {
+ if (RECORD_IS_REPLAY)
+ {
+ /* Let user choose if he wants to write memory or not. */
+ if (!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;
+
+ /* Destroy the record from here forward. */
+ record_list_release_next ();
+ }
+
+ /* Check record_insn_num */
+ record_check_insn_num (0);
+
+ /* Record registers change to list as an instruction. */
+ record_arch_list_head = NULL;
+ record_arch_list_tail = NULL;
+ if (record_arch_list_add_mem (offset, len))
+ {
+ record_list_release (record_arch_list_tail);
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ _("Process record: failed to record "
+ "execution log."));
+ return -1;
+ }
+ if (record_arch_list_add_end (0))
+ {
+ record_list_release (record_arch_list_tail);
+ if (record_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ _("Process record: failed to record "
+ "execution log."));
+ return -1;
+ }
+ record_list->next = record_arch_list_head;
+ record_arch_list_head->prev = record_list;
+ record_list = record_arch_list_tail;
+
+ if (record_insn_num == record_insn_max_num && record_insn_max_num)
+ record_list_release_first ();
+ else
+ record_insn_num++;
+ }
+
+ return record_beneath_to_xfer_partial (record_beneath_to_xfer_partial_ops,
+ object, annex, readbuf, writebuf,
+ offset, len);
+}
+
+/* record_insert_breakpoint
+ record_remove_breakpoint
+ Behavior is conditional on RECORD_IS_REPLAY.
+ We will not actually insert or remove breakpoints when replaying,
+ nor when recording. */
+
+static int
+record_insert_breakpoint (struct bp_target_info *bp_tgt)
+{
+ if (!RECORD_IS_REPLAY)
+ {
+ struct cleanup *old_cleanups = record_gdb_operation_disable_set ();
+ int ret = record_beneath_to_insert_breakpoint (bp_tgt);
+
+ do_cleanups (old_cleanups);
+
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+record_remove_breakpoint (struct bp_target_info *bp_tgt)
+{
+ if (!RECORD_IS_REPLAY)
+ {
+ struct cleanup *old_cleanups = record_gdb_operation_disable_set ();
+ int ret = record_beneath_to_remove_breakpoint (bp_tgt);
+
+ do_cleanups (old_cleanups);
+
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+record_can_execute_reverse (void)
+{
+ return 1;
+}
+
+static void
+init_record_ops (void)
+{
+ record_ops.to_shortname = "record";
+ record_ops.to_longname = "Process record and replay target";
+ record_ops.to_doc =
+ "Log program while executing and replay execution from log.";
+ record_ops.to_open = record_open;
+ record_ops.to_close = record_close;
+ record_ops.to_resume = record_resume;
+ record_ops.to_wait = record_wait;
+ record_ops.to_disconnect = record_disconnect;
+ record_ops.to_detach = record_detach;
+ record_ops.to_mourn_inferior = record_mourn_inferior;
+ record_ops.to_kill = record_kill;
+ record_ops.to_create_inferior = find_default_create_inferior;
+ record_ops.to_store_registers = record_store_registers;
+ record_ops.to_xfer_partial = record_xfer_partial;
+ record_ops.to_insert_breakpoint = record_insert_breakpoint;
+ record_ops.to_remove_breakpoint = record_remove_breakpoint;
+ record_ops.to_can_execute_reverse = record_can_execute_reverse;
+ record_ops.to_stratum = record_stratum;
+ record_ops.to_magic = OPS_MAGIC;
+}
+
+static void
+show_record_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Debugging of process record target is %s.\n"),
+ value);
+}
+
+/* cmd_record_start -- alias for "target record". */
+
+static void
+cmd_record_start (char *args, int from_tty)
+{
+ execute_command ("target record", from_tty);
+}
+
+/* cmd_record_delete -- truncate the record log from the present point
+ of replay until the end. */
+
+static void
+cmd_record_delete (char *args, int from_tty)
+{
+ if (TARGET_IS_PROCESS_RECORD)
+ {
+ if (RECORD_IS_REPLAY)
+ {
+ if (!from_tty || query (_("Delete the log from this point forward "
+ "and begin to record the running message "
+ "at current PC?")))
+ record_list_release_next ();
+ }
+ else
+ printf_unfiltered (_("Already at end of record list.\n"));
+
+ }
+ else
+ printf_unfiltered (_("Process record is not started.\n"));
+}
+
+/* cmd_record_stop -- implement the "stoprecord" command. */
+
+static void
+cmd_record_stop (char *args, int from_tty)
+{
+ if (TARGET_IS_PROCESS_RECORD)
+ {
+ if (!record_list || !from_tty || query (_("Delete recorded log and "
+ "stop recording?")))
+ unpush_target (&record_ops);
+ }
+ else
+ printf_unfiltered (_("Process record is not started.\n"));
+}
+
+/* set_record_insn_max_num -- set upper limit of record log size. */
+
+static void
+set_record_insn_max_num (char *args, int from_tty, struct cmd_list_element *c)
+{
+ if (record_insn_num > record_insn_max_num && record_insn_max_num)
+ {
+ printf_unfiltered (_("Record instructions number is bigger than "
+ "record instructions max number. Auto delete "
+ "the first ones?\n"));
+
+ while (record_insn_num > record_insn_max_num)
+ record_list_release_first ();
+ }
+}
+
+/* show_record_insn_number -- 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);
+}
+
+void
+_initialize_record (void)
+{
+ /* Init record_maskall. */
+ if (sigfillset (&record_maskall) == -1)
+ perror_with_name (_("Process record: sigfillset failed"));
+
+ /* Init record_first. */
+ record_first.prev = NULL;
+ record_first.next = NULL;
+ record_first.type = record_end;
+ record_first.u.need_dasm = 0;
+
+ init_record_ops ();
+ add_target (&record_ops);
+
+ add_setshow_zinteger_cmd ("record", no_class, &record_debug,
+ _("Set debugging of record/replay feature."),
+ _("Show debugging of record/replay feature."),
+ _("When enabled, debugging output for "
+ "record/replay feature is displayed."),
+ NULL, show_record_debug, &setdebuglist,
+ &showdebuglist);
+
+ add_com ("record", class_obscure, cmd_record_start,
+ _("Abbreviated form of \"target record\" command."));
+
+ add_com_alias ("rec", "record", class_obscure, 1);
+
+ /* XXX: I try to use some simple commands such as "disconnect" and
+ "detach" to support this functions. But these commands all have
+ other affect to GDB such as call function "no_shared_libraries".
+ So I add special commands to GDB. */
+ add_com ("delrecord", class_obscure, cmd_record_delete,
+ _("Delete the rest of execution log and start recording it anew."));
+ add_com_alias ("dr", "delrecord", class_obscure, 1);
+ add_com ("stoprecord", class_obscure, cmd_record_stop,
+ _("Stop the record/replay target."));
+ add_com_alias ("sr", "stoprecord", class_obscure, 1);
+
+ /* Record instructions number limit command. */
+ add_setshow_boolean_cmd ("record-stop-at-limit", no_class,
+ &record_stop_at_limit,
+ _("Set whether record/replay stop when "
+ "record/replay buffer becomes full."),
+ _("Show whether record/replay stop when "
+ "record/replay buffer becomes full."),
+ _("Enable is default value.\n"
+ "When enabled, if the record/replay buffer "
+ "becomes full,\n"
+ "ask user what to do.\n"
+ "When disabled, if the record/replay buffer "
+ "becomes full,\n"
+ "delete it and start new recording."),
+ NULL, NULL, &setlist, &showlist);
+ add_setshow_zinteger_cmd ("record-insn-number-max", no_class,
+ &record_insn_max_num,
+ _("Set record/replay buffer limit."),
+ _("Show record/replay buffer limit."),
+ _("Set the maximum number of instructions to be "
+ "stored in the\n"
+ "record/replay buffer. "
+ "Zero means unlimited (default 200000)."),
+ set_record_insn_max_num,
+ NULL, &setlist, &showlist);
+ add_info ("record-insn-number", show_record_insn_number,
+ _("Show the current number of instructions in the "
+ "record/replay buffer."));
+}
--- /dev/null
+++ b/record.h
@@ -0,0 +1,87 @@
+/* Process record and replay target for GDB, the GNU debugger.
+
+ Copyright (C) 2008 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef _RECORD_H_
+#define _RECORD_H_
+
+#define TARGET_IS_PROCESS_RECORD \
+ (current_target.beneath == &record_ops)
+#define RECORD_IS_REPLAY \
+ (record_list->next || execution_direction == EXEC_REVERSE)
+
+typedef struct record_reg_s
+{
+ int num;
+ gdb_byte *val;
+} record_reg_t;
+
+typedef struct record_mem_s
+{
+ CORE_ADDR addr;
+ int len;
+ gdb_byte *val;
+} record_mem_t;
+
+enum record_type
+{
+ record_end = 0,
+ record_reg,
+ record_mem
+};
+
+/* This is the core struct of record function.
+
+ An entity of record_t 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 record_t ("record_end") that points out this
+ is the last record_t of this instruction.
+
+ Each record_t is linked to "record_list" by "prev" and "next".
+ */
+typedef struct record_s
+{
+ struct record_s *prev;
+ struct record_s *next;
+ enum record_type type;
+ union
+ {
+ /* reg */
+ record_reg_t reg;
+ /* mem */
+ record_mem_t mem;
+ /* end */
+ int need_dasm;
+ } u;
+} record_t;
+
+extern int record_debug;
+extern record_t *record_list;
+extern record_t *record_arch_list_head;
+extern record_t *record_arch_list_tail;
+extern struct regcache *record_regcache;
+
+extern struct target_ops record_ops;
+
+extern int record_arch_list_add_reg (int num);
+extern int record_arch_list_add_mem (CORE_ADDR addr, int len);
+extern int record_arch_list_add_end (int need_dasm);
+extern void record_message (struct gdbarch *gdbarch);
+extern struct cleanup * record_gdb_operation_disable_set (void);
+
+#endif /* _RECORD_H_ */