2004-12-08 01:02:20 +00:00
|
|
|
2004-12-07 Jeff Johnston <jjohnstn@redhat.com>
|
|
|
|
|
|
|
|
|
|
* linux-nat.c (find_singlestep_lwp_callback): New function.
|
|
|
|
|
(linux-nat-wait): Before waiting on any pid, check if there
|
|
|
|
|
is a stepping lwp and if so, wait on it specifically.
|
|
|
|
|
|
|
|
|
|
--- gdb-6.3/gdb/linux-nat.c.fix Tue Dec 7 19:39:34 2004
|
|
|
|
|
+++ gdb-6.3/gdb/linux-nat.c Tue Dec 7 19:39:46 2004
|
|
|
|
|
@@ -1489,9 +1489,21 @@ count_events_callback (struct lwp_info *
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
-/* Select the LWP (if any) that is currently being single-stepped. */
|
|
|
|
|
+/* Find an LWP (if any) that is currently being single-stepped. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
+find_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
+{
|
|
|
|
|
+ if (lp->step)
|
|
|
|
|
+ return 1;
|
|
|
|
|
+ else
|
|
|
|
|
+ return 0;
|
|
|
|
|
+}
|
|
|
|
|
+
|
|
|
|
|
+/* Select the LWP with an event (if any) that is currently being
|
|
|
|
|
+ single-stepped. */
|
|
|
|
|
+
|
|
|
|
|
+static int
|
|
|
|
|
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
if (lp->step && lp->status != 0)
|
|
|
|
|
@@ -1774,7 +1786,25 @@ retry:
|
|
|
|
|
least if there are any LWPs at all. */
|
|
|
|
|
gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL));
|
|
|
|
|
|
|
|
|
|
- /* First check if there is a LWP with a wait status pending. */
|
|
|
|
|
+ /* Check if there is any LWP that is being single-stepped. We need to
|
|
|
|
|
+ wait specifically on such an LWP because the higher-level code is
|
|
|
|
|
+ expecting a step operation to find an event on the stepped LWP.
|
|
|
|
|
+ It is possible for other events to occur before the step operation
|
|
|
|
|
+ gets the expected trap so we don't want to wait on any LWP.
|
|
|
|
|
+ This has ramifications when adjustment of the PC is required which can be
|
|
|
|
|
+ different after a breakpoint vs a step (e.g. x86). */
|
|
|
|
|
+ lp = iterate_over_lwps (find_singlestep_lwp_callback, NULL);
|
|
|
|
|
+ if (lp) {
|
2005-01-07 21:07:55 +00:00
|
|
|
+ if (debug_linux_nat)
|
2004-12-08 01:02:20 +00:00
|
|
|
+ fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
+ "LLW: Found step lwp %s.\n",
|
|
|
|
|
+ target_pid_to_str (lp->ptid));
|
|
|
|
|
+ ptid = lp->ptid;
|
|
|
|
|
+ pid = PIDGET (ptid);
|
|
|
|
|
+ }
|
|
|
|
|
+
|
|
|
|
|
+ /* If any pid, check if there is a LWP with a wait status pending. */
|
|
|
|
|
+
|
|
|
|
|
if (pid == -1)
|
|
|
|
|
{
|
|
|
|
|
/* Any LWP that's been resumed will do. */
|
