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Running the current tree against my software-single-step-on-x86_64

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branch showed some extra assertions I have in place triggering.  Turns
out my previous change to 'resume' was incomplete, and we mishandle
the 'hw_step' / 'step' variable pair.  (I swear I had fixed this, but
I guess I lost that in some local branch...)

Tested on x86_64 Fedora 20.

gdb/
2014-05-29  Pedro Alves  <palves@redhat.com>

	* infrun.c (resume): Rename local 'hw_step' to 'entry_step'
	and make it const.  When a single-step decays to a continue,
	clear 'step', not 'hw_step'.  Pass whether the caller wanted
	to step to user_visible_resume_ptid, not what we ask the
	target to do.
This commit is contained in:
Pedro Alves 2014-05-29 22:17:20 +01:00
parent bdc36728ee
commit a09dd4413d
2 changed files with 21 additions and 7 deletions
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8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2014-05-29 Pedro Alves <palves@redhat.com>
* infrun.c (resume): Rename local 'hw_step' to 'entry_step'
and make it const. When a single-step decays to a continue,
clear 'step', not 'hw_step'. Pass whether the caller wanted
to step to user_visible_resume_ptid, not what we ask the
target to do.
2014-05-29 Pedro Alves <palves@redhat.com>
* infrun.c (process_event_stop_test, handle_step_into_function)

20
gdb/infrun.c
View File

@ -1769,7 +1769,13 @@ resume (int step, enum gdb_signal sig)
CORE_ADDR pc = regcache_read_pc (regcache);
struct address_space *aspace = get_regcache_aspace (regcache);
ptid_t resume_ptid;
int hw_step = step;
/* From here on, this represents the caller's step vs continue
request, while STEP represents what we'll actually request the
target to do. STEP can decay from a step to a continue, if e.g.,
we need to implement single-stepping with breakpoints (software
single-step). When deciding whether "set scheduler-locking step"
applies, it's the callers intention that counts. */
const int entry_step = step;
QUIT;
@ -1789,7 +1795,7 @@ resume (int step, enum gdb_signal sig)
if (debug_infrun)
fprintf_unfiltered (gdb_stdlog,
"infrun: resume : clear step\n");
hw_step = 0;
step = 0;
}
if (debug_infrun)
@ -1834,7 +1840,7 @@ a command like `return' or `jump' to continue execution."));
step software breakpoint. */
if (use_displaced_stepping (gdbarch)
&& (tp->control.trap_expected
|| (hw_step && gdbarch_software_single_step_p (gdbarch)))
|| (step && gdbarch_software_single_step_p (gdbarch)))
&& sig == GDB_SIGNAL_0
&& !current_inferior ()->waiting_for_vfork_done)
{
@ -1851,7 +1857,7 @@ a command like `return' or `jump' to continue execution."));
Unless we're calling an inferior function, as in that
case we pretend the inferior doesn't run at all. */
if (!tp->control.in_infcall)
set_running (user_visible_resume_ptid (step), 1);
set_running (user_visible_resume_ptid (entry_step), 1);
discard_cleanups (old_cleanups);
return;
}
@ -1861,8 +1867,8 @@ a command like `return' or `jump' to continue execution."));
pc = regcache_read_pc (get_thread_regcache (inferior_ptid));
displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid));
hw_step = gdbarch_displaced_step_hw_singlestep (gdbarch,
displaced->step_closure);
step = gdbarch_displaced_step_hw_singlestep (gdbarch,
displaced->step_closure);
}
/* Do we need to do it the hard way, w/temp breakpoints? */
@ -1924,7 +1930,7 @@ a command like `return' or `jump' to continue execution."));
/* Decide the set of threads to ask the target to resume. Start
by assuming everything will be resumed, than narrow the set
by applying increasingly restricting conditions. */
resume_ptid = user_visible_resume_ptid (step);
resume_ptid = user_visible_resume_ptid (entry_step);
/* Even if RESUME_PTID is a wildcard, and we end up resuming less
(e.g., we might need to step over a breakpoint), from the