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-rw-r--r--gdb/ChangeLog35
-rw-r--r--gdb/breakpoint.c16
-rw-r--r--gdb/gdbthread.h5
-rw-r--r--gdb/infrun.c144
-rw-r--r--gdb/infrun.h4
5 files changed, 114 insertions, 90 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 5de5681..0b03948 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,40 @@
2014-10-15 Pedro Alves <palves@redhat.com>
+ * breakpoint.c (should_be_inserted): Don't insert watchpoints if
+ trying to step past a non-steppable watchpoint.
+ * gdbthread.h (struct thread_info) <stepping_over_watchpoint>: New
+ field.
+ * infrun.c (struct step_over_info): Add new field
+ 'nonsteppable_watchpoint_p' and adjust comments.
+ (set_step_over_info): New 'nonsteppable_watchpoint_p' parameter.
+ Adjust.
+ (clear_step_over_info): Clear nonsteppable_watchpoint_p as well.
+ (stepping_past_nonsteppable_watchpoint): New function.
+ (step_over_info_valid_p): Also return true if stepping past a
+ nonsteppable watchpoint.
+ (proceed): Adjust call to set_step_over_info. Remove reference to
+ init_infwait_state.
+ (init_wait_for_inferior): Remove reference to init_infwait_state.
+ (waiton_ptid): Delete global.
+ (struct execution_control_state)
+ <stepped_after_stopped_by_watchpoint>: Delete field.
+ (wait_for_inferior, fetch_inferior_event): Always pass
+ minus_one_ptid to target_wait.
+ (init_thread_stepping_state): Clear 'stepping_over_watchpoint'
+ field.
+ (init_infwait_state): Delete function.
+ (handle_inferior_event): Remove infwait_state handling.
+ (handle_signal_stop) <watchpoints handling>: Adjust after
+ stepped_after_stopped_by_watchpoint removal. Don't remove
+ breakpoints here nor set infwait_state. Set the thread's
+ stepping_over_watchpoint flag, and call keep_going instead.
+ (keep_going): Handle stepping_over_watchpoint. Adjust
+ set_step_over_info calls.
+ * infrun.h (stepping_past_nonsteppable_watchpoint): Declare
+ function.
+
+2014-10-15 Pedro Alves <palves@redhat.com>
+
* infrun.c (step_over_info_valid_p): New function.
(resume): Use step_over_info_valid_p instead of checking the
threads's trap_expected flag.
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index dc2e297..2a6e51d 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -2208,6 +2208,22 @@ should_be_inserted (struct bp_location *bl)
return 0;
}
+ /* Don't insert watchpoints if we're trying to step past the
+ instruction that triggered one. */
+ if ((bl->loc_type == bp_loc_hardware_watchpoint)
+ && stepping_past_nonsteppable_watchpoint ())
+ {
+ if (debug_infrun)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "infrun: stepping past non-steppable watchpoint. "
+ "skipping watchpoint at %s:%d\n",
+ paddress (bl->gdbarch, bl->address),
+ bl->length);
+ }
+ return 0;
+ }
+
return 1;
}
diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
index 26ca925..36ad5a7 100644
--- a/gdb/gdbthread.h
+++ b/gdb/gdbthread.h
@@ -197,6 +197,11 @@ struct thread_info
/* Should we step over breakpoint next time keep_going is called? */
int stepping_over_breakpoint;
+ /* Should we step over a watchpoint next time keep_going is called?
+ This is needed on targets with non-continuable, non-steppable
+ watchpoints. */
+ int stepping_over_watchpoint;
+
/* Set to TRUE if we should finish single-stepping over a breakpoint
after hitting the current step-resume breakpoint. The context here
is that GDB is to do `next' or `step' while signal arrives.
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 650d711..d0431df 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -377,8 +377,6 @@ static void context_switch (ptid_t ptid);
void init_thread_stepping_state (struct thread_info *tss);
-static void init_infwait_state (void);
-
static const char follow_fork_mode_child[] = "child";
static const char follow_fork_mode_parent[] = "parent";
@@ -1208,16 +1206,20 @@ static ptid_t singlestep_ptid;
/* PC when we started this single-step. */
static CORE_ADDR singlestep_pc;
-/* Info about an instruction that is being stepped over. Invalid if
- ASPACE is NULL. */
+/* Info about an instruction that is being stepped over. */
struct step_over_info
{
- /* The instruction's address space. */
+ /* If we're stepping past a breakpoint, this is the address space
+ and address of the instruction the breakpoint is set at. We'll
+ skip inserting all breakpoints here. Valid iff ASPACE is
+ non-NULL. */
struct address_space *aspace;
-
- /* The instruction's address. */
CORE_ADDR address;
+
+ /* The instruction being stepped over triggers a nonsteppable
+ watchpoint. If true, we'll skip inserting watchpoints. */
+ int nonsteppable_watchpoint_p;
};
/* The step-over info of the location that is being stepped over.
@@ -1250,10 +1252,12 @@ static struct step_over_info step_over_info;
stepping over. */
static void
-set_step_over_info (struct address_space *aspace, CORE_ADDR address)
+set_step_over_info (struct address_space *aspace, CORE_ADDR address,
+ int nonsteppable_watchpoint_p)
{
step_over_info.aspace = aspace;
step_over_info.address = address;
+ step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p;
}
/* Called when we're not longer stepping over a breakpoint / an
@@ -1264,6 +1268,7 @@ clear_step_over_info (void)
{
step_over_info.aspace = NULL;
step_over_info.address = 0;
+ step_over_info.nonsteppable_watchpoint_p = 0;
}
/* See infrun.h. */
@@ -1278,12 +1283,21 @@ stepping_past_instruction_at (struct address_space *aspace,
step_over_info.address));
}
+/* See infrun.h. */
+
+int
+stepping_past_nonsteppable_watchpoint (void)
+{
+ return step_over_info.nonsteppable_watchpoint_p;
+}
+
/* Returns true if step-over info is valid. */
static int
step_over_info_valid_p (void)
{
- return (step_over_info.aspace != NULL);
+ return (step_over_info.aspace != NULL
+ || stepping_past_nonsteppable_watchpoint ());
}
@@ -2555,7 +2569,7 @@ proceed (CORE_ADDR addr, enum gdb_signal siggnal, int step)
struct regcache *regcache = get_current_regcache ();
set_step_over_info (get_regcache_aspace (regcache),
- regcache_read_pc (regcache));
+ regcache_read_pc (regcache), 0);
}
else
clear_step_over_info ();
@@ -2595,9 +2609,6 @@ proceed (CORE_ADDR addr, enum gdb_signal siggnal, int step)
correctly when the inferior is stopped. */
tp->prev_pc = regcache_read_pc (get_current_regcache ());
- /* Reset to normal state. */
- init_infwait_state ();
-
/* Resume inferior. */
resume (tp->control.trap_expected || step || bpstat_should_step (),
tp->suspend.stop_signal);
@@ -2662,7 +2673,6 @@ init_wait_for_inferior (void)
target_last_wait_ptid = minus_one_ptid;
previous_inferior_ptid = inferior_ptid;
- init_infwait_state ();
/* Discard any skipped inlined frames. */
clear_inline_frame_state (minus_one_ptid);
@@ -2683,9 +2693,6 @@ enum infwait_states
infwait_nonstep_watch_state
};
-/* The PTID we'll do a target_wait on.*/
-ptid_t waiton_ptid;
-
/* Current inferior wait state. */
static enum infwait_states infwait_state;
@@ -2705,11 +2712,6 @@ struct execution_control_state
const char *stop_func_name;
int wait_some_more;
- /* We were in infwait_step_watch_state or
- infwait_nonstep_watch_state state, and the thread reported an
- event. */
- int stepped_after_stopped_by_watchpoint;
-
/* True if the event thread hit the single-step breakpoint of
another thread. Thus the event doesn't cause a stop, the thread
needs to be single-stepped past the single-step breakpoint before
@@ -3034,6 +3036,7 @@ wait_for_inferior (void)
struct execution_control_state ecss;
struct execution_control_state *ecs = &ecss;
struct cleanup *old_chain;
+ ptid_t waiton_ptid = minus_one_ptid;
memset (ecs, 0, sizeof (*ecs));
@@ -3089,6 +3092,7 @@ fetch_inferior_event (void *client_data)
struct cleanup *ts_old_chain;
int was_sync = sync_execution;
int cmd_done = 0;
+ ptid_t waiton_ptid = minus_one_ptid;
memset (ecs, 0, sizeof (*ecs));
@@ -3206,6 +3210,7 @@ void
init_thread_stepping_state (struct thread_info *tss)
{
tss->stepping_over_breakpoint = 0;
+ tss->stepping_over_watchpoint = 0;
tss->step_after_step_resume_breakpoint = 0;
}
@@ -3375,13 +3380,6 @@ adjust_pc_after_break (struct execution_control_state *ecs)
}
}
-static void
-init_infwait_state (void)
-{
- waiton_ptid = pid_to_ptid (-1);
- infwait_state = infwait_normal_state;
-}
-
static int
stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id)
{
@@ -3602,40 +3600,6 @@ handle_inferior_event (struct execution_control_state *ecs)
&& ecs->ws.kind != TARGET_WAITKIND_EXITED)
set_executing (ecs->ptid, 0);
- switch (infwait_state)
- {
- case infwait_normal_state:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n");
- break;
-
- case infwait_step_watch_state:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: infwait_step_watch_state\n");
-
- ecs->stepped_after_stopped_by_watchpoint = 1;
- break;
-
- case infwait_nonstep_watch_state:
- if (debug_infrun)
- fprintf_unfiltered (gdb_stdlog,
- "infrun: infwait_nonstep_watch_state\n");
- insert_breakpoints ();
-
- /* FIXME-maybe: is this cleaner than setting a flag? Does it
- handle things like signals arriving and other things happening
- in combination correctly? */
- ecs->stepped_after_stopped_by_watchpoint = 1;
- break;
-
- default:
- internal_error (__FILE__, __LINE__, _("bad switch"));
- }
-
- infwait_state = infwait_normal_state;
- waiton_ptid = pid_to_ptid (-1);
-
switch (ecs->ws.kind)
{
case TARGET_WAITKIND_LOADED:
@@ -4225,7 +4189,9 @@ handle_signal_stop (struct execution_control_state *ecs)
singlestep_breakpoints_inserted_p = 0;
}
- if (ecs->stepped_after_stopped_by_watchpoint)
+ if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP
+ && ecs->event_thread->control.trap_expected
+ && ecs->event_thread->stepping_over_watchpoint)
stopped_by_watchpoint = 0;
else
stopped_by_watchpoint = watchpoints_triggered (&ecs->ws);
@@ -4255,29 +4221,21 @@ handle_signal_stop (struct execution_control_state *ecs)
It is far more common to need to disable a watchpoint to step
the inferior over it. If we have non-steppable watchpoints,
we must disable the current watchpoint; it's simplest to
- disable all watchpoints and breakpoints. */
- int hw_step = 1;
-
- if (!target_have_steppable_watchpoint)
- {
- remove_breakpoints ();
- /* See comment in resume why we need to stop bypassing signals
- while breakpoints have been removed. */
- target_pass_signals (0, NULL);
- }
- /* Single step */
- hw_step = maybe_software_singlestep (gdbarch, stop_pc);
- target_resume (ecs->ptid, hw_step, GDB_SIGNAL_0);
- waiton_ptid = ecs->ptid;
- if (target_have_steppable_watchpoint)
- infwait_state = infwait_step_watch_state;
- else
- infwait_state = infwait_nonstep_watch_state;
- prepare_to_wait (ecs);
+ disable all watchpoints.
+
+ Any breakpoint at PC must also be stepped over -- if there's
+ one, it will have already triggered before the watchpoint
+ triggered, and we either already reported it to the user, or
+ it didn't cause a stop and we called keep_going. In either
+ case, if there was a breakpoint at PC, we must be trying to
+ step past it. */
+ ecs->event_thread->stepping_over_watchpoint = 1;
+ keep_going (ecs);
return;
}
ecs->event_thread->stepping_over_breakpoint = 0;
+ ecs->event_thread->stepping_over_watchpoint = 0;
bpstat_clear (&ecs->event_thread->control.stop_bpstat);
ecs->event_thread->control.stop_step = 0;
stop_print_frame = 1;
@@ -6015,6 +5973,8 @@ keep_going (struct execution_control_state *ecs)
{
volatile struct gdb_exception e;
struct regcache *regcache = get_current_regcache ();
+ int remove_bp;
+ int remove_wps;
/* Either the trap was not expected, but we are continuing
anyway (if we got a signal, the user asked it be passed to
@@ -6034,13 +5994,19 @@ keep_going (struct execution_control_state *ecs)
(watchpoints, etc.) but the one we're stepping over, step one
instruction, and then re-insert the breakpoint when that step
is finished. */
- if ((ecs->hit_singlestep_breakpoint
- || thread_still_needs_step_over (ecs->event_thread))
- && !use_displaced_stepping (get_regcache_arch (regcache)))
+
+ remove_bp = (ecs->hit_singlestep_breakpoint
+ || thread_still_needs_step_over (ecs->event_thread));
+ remove_wps = (ecs->event_thread->stepping_over_watchpoint
+ && !target_have_steppable_watchpoint);
+
+ if (remove_bp && !use_displaced_stepping (get_regcache_arch (regcache)))
{
set_step_over_info (get_regcache_aspace (regcache),
- regcache_read_pc (regcache));
+ regcache_read_pc (regcache), remove_wps);
}
+ else if (remove_wps)
+ set_step_over_info (NULL, 0, remove_wps);
else
clear_step_over_info ();
@@ -6056,9 +6022,7 @@ keep_going (struct execution_control_state *ecs)
return;
}
- ecs->event_thread->control.trap_expected
- = (ecs->event_thread->stepping_over_breakpoint
- || ecs->hit_singlestep_breakpoint);
+ ecs->event_thread->control.trap_expected = (remove_bp || remove_wps);
/* Do not deliver GDB_SIGNAL_TRAP (except when the user
explicitly specifies that such a signal should be delivered
diff --git a/gdb/infrun.h b/gdb/infrun.h
index fb6276b..4d5159e 100644
--- a/gdb/infrun.h
+++ b/gdb/infrun.h
@@ -120,6 +120,10 @@ extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
extern int stepping_past_instruction_at (struct address_space *aspace,
CORE_ADDR address);
+/* Returns true if we're trying to step past an instruction that
+ triggers a non-steppable watchpoint. */
+extern int stepping_past_nonsteppable_watchpoint (void);
+
extern void set_step_info (struct frame_info *frame,
struct symtab_and_line sal);
generated by cgit v1.1 at 2024-10-17 17:42:48 +0000