2004-05-10 Andrew Cagney <cagney@redhat.com>
* infrun.c (check_sigtramp2): Delete function. (handle_inferior_event): When single stepping, and taking a signal, set a breakpoint at the signal return address. Delete redundant calls to check_sigtramp2. (insert_step_resume_breakpoint): New function. (through_sigtramp_breakpoint, handle_inferior_event) (follow_exec, wait_for_inferior, fetch_inferior_event) (currently_stepping, keep_going): Delete most uses of through_sigtramp_breakpoint, not that it should be deleted. (delete_breakpoint_current_contents): Delete function. Index: testsuite/ChangeLog 2004-05-10 Andrew Cagney <cagney@redhat.com> * gdb.base/signals.exp (signal_tests_1): Simplify "continue to func1" and "next to 2nd alarm", kernel bug avoided.
This commit is contained in:
Andrew Cagney
parent
03f4cc205b
commit
d303a6c766
@ -1,3 +1,16 @@
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2004-05-10 Andrew Cagney <cagney@redhat.com>
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* infrun.c (check_sigtramp2): Delete function.
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(handle_inferior_event): When single stepping, and taking a
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signal, set a breakpoint at the signal return address. Delete
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redundant calls to check_sigtramp2.
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(insert_step_resume_breakpoint): New function.
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(through_sigtramp_breakpoint, handle_inferior_event)
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(follow_exec, wait_for_inferior, fetch_inferior_event)
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(currently_stepping, keep_going): Delete most uses of
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through_sigtramp_breakpoint, not that it should be deleted.
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(delete_breakpoint_current_contents): Delete function.
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2004-05-10 Randolph Chung <tausq@debian.org>
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* config/pa/linux.mt (TM_FILE): Use new tm-linux.h for hppa-linux
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189
gdb/infrun.c
189
gdb/infrun.c
@ -60,8 +60,6 @@ static void resume_cleanups (void *);
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static int hook_stop_stub (void *);
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static void delete_breakpoint_current_contents (void *);
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static int restore_selected_frame (void *);
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static void build_infrun (void);
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@ -305,6 +303,8 @@ static int breakpoints_failed;
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static int stop_print_frame;
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static struct breakpoint *step_resume_breakpoint = NULL;
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/* NOTE: cagney/2004-05-08: This variable needs to be garbage
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collected, it isn't used. */
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static struct breakpoint *through_sigtramp_breakpoint = NULL;
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/* On some platforms (e.g., HP-UX), hardware watchpoints have bad
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@ -423,9 +423,6 @@ follow_exec (int pid, char *execd_pathname)
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step_range_start = 0;
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step_range_end = 0;
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/* If there was one, it's gone now. */
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through_sigtramp_breakpoint = NULL;
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/* What is this a.out's name? */
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printf_unfiltered ("Executing new program: %s\n", execd_pathname);
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@ -905,17 +902,6 @@ init_wait_for_inferior (void)
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stepping_past_singlestep_breakpoint = 0;
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}
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static void
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delete_breakpoint_current_contents (void *arg)
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{
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struct breakpoint **breakpointp = (struct breakpoint **) arg;
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if (*breakpointp != NULL)
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{
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delete_breakpoint (*breakpointp);
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*breakpointp = NULL;
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}
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}
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/* This enum encodes possible reasons for doing a target_wait, so that
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wfi can call target_wait in one place. (Ultimately the call will be
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@ -984,9 +970,10 @@ void init_execution_control_state (struct execution_control_state *ecs);
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static void handle_step_into_function (struct execution_control_state *ecs);
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void handle_inferior_event (struct execution_control_state *ecs);
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static void check_sigtramp2 (struct execution_control_state *ecs);
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static void step_into_function (struct execution_control_state *ecs);
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static void step_over_function (struct execution_control_state *ecs);
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static void insert_step_resume_breakpoint (struct frame_info *step_frame,
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struct execution_control_state *ecs);
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static void stop_stepping (struct execution_control_state *ecs);
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static void prepare_to_wait (struct execution_control_state *ecs);
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static void keep_going (struct execution_control_state *ecs);
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@ -1008,8 +995,6 @@ wait_for_inferior (void)
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old_cleanups = make_cleanup (delete_step_resume_breakpoint,
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&step_resume_breakpoint);
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make_cleanup (delete_breakpoint_current_contents,
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&through_sigtramp_breakpoint);
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/* wfi still stays in a loop, so it's OK just to take the address of
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a local to get the ecs pointer. */
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@ -1070,8 +1055,6 @@ fetch_inferior_event (void *client_data)
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{
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old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint,
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&step_resume_breakpoint);
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make_exec_cleanup (delete_breakpoint_current_contents,
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&through_sigtramp_breakpoint);
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/* Fill in with reasonable starting values. */
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init_execution_control_state (async_ecs);
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@ -1989,15 +1972,9 @@ handle_inferior_event (struct execution_control_state *ecs)
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return;
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}
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/* Don't even think about breakpoints
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if just proceeded over a breakpoint.
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However, if we are trying to proceed over a breakpoint
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and end up in sigtramp, then through_sigtramp_breakpoint
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will be set and we should check whether we've hit the
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step breakpoint. */
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if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected
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&& through_sigtramp_breakpoint == NULL)
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/* Don't even think about breakpoints if just proceeded over a
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breakpoint. */
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if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected)
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bpstat_clear (&stop_bpstat);
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else
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{
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@ -2080,39 +2057,22 @@ process_event_stop_test:
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if (signal_program[stop_signal] == 0)
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stop_signal = TARGET_SIGNAL_0;
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/* I'm not sure whether this needs to be check_sigtramp2 or
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whether it could/should be keep_going.
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if (step_range_end != 0
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&& stop_signal != TARGET_SIGNAL_0
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&& stop_pc >= step_range_start && stop_pc < step_range_end
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&& frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id))
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{
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/* The inferior is about to take a signal that will take it
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out of the single step range. Set a breakpoint at the
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current PC (which is presumably where the signal handler
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will eventually return) and then allow the inferior to
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run free.
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This used to jump to step_over_function if we are stepping,
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which is wrong.
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Suppose the user does a `next' over a function call, and while
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that call is in progress, the inferior receives a signal for
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which GDB does not stop (i.e., signal_stop[SIG] is false). In
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that case, when we reach this point, there is already a
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step-resume breakpoint established, right where it should be:
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immediately after the function call the user is "next"-ing
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over. If we call step_over_function now, two bad things
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happen:
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- we'll create a new breakpoint, at wherever the current
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frame's return address happens to be. That could be
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anywhere, depending on what function call happens to be on
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the top of the stack at that point. Point is, it's probably
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not where we need it.
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- the existing step-resume breakpoint (which is at the correct
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address) will get orphaned: step_resume_breakpoint will point
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to the new breakpoint, and the old step-resume breakpoint
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will never be cleaned up.
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The old behavior was meant to help HP-UX single-step out of
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sigtramps. It would place the new breakpoint at prev_pc, which
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was certainly wrong. I don't know the details there, so fixing
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this probably breaks that. As with anything else, it's up to
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the HP-UX maintainer to furnish a fix that doesn't break other
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platforms. --JimB, 20 May 1999 */
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check_sigtramp2 (ecs);
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Note that this is only needed for a signal delivered
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while in the single-step range. Nested signals aren't a
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problem as they eventually all return. */
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insert_step_resume_breakpoint (get_current_frame (), ecs);
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}
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keep_going (ecs);
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return;
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}
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@ -2153,13 +2113,6 @@ process_event_stop_test:
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{
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delete_step_resume_breakpoint (&step_resume_breakpoint);
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}
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/* Not sure whether we need to blow this away too, but probably
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it is like the step-resume breakpoint. */
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if (through_sigtramp_breakpoint != NULL)
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{
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delete_breakpoint (through_sigtramp_breakpoint);
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through_sigtramp_breakpoint = NULL;
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}
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#if 0
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/* FIXME - Need to implement nested temporary breakpoints */
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@ -2207,9 +2160,8 @@ process_event_stop_test:
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case BPSTAT_WHAT_STOP_NOISY:
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stop_print_frame = 1;
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/* We are about to nuke the step_resume_breakpoint and
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through_sigtramp_breakpoint via the cleanup chain, so
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no need to worry about it here. */
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/* We are about to nuke the step_resume_breakpointt via the
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cleanup chain, so no need to worry about it here. */
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stop_stepping (ecs);
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return;
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@ -2217,9 +2169,8 @@ process_event_stop_test:
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case BPSTAT_WHAT_STOP_SILENT:
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stop_print_frame = 0;
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/* We are about to nuke the step_resume_breakpoint and
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through_sigtramp_breakpoint via the cleanup chain, so
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no need to worry about it here. */
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/* We are about to nuke the step_resume_breakpoin via the
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cleanup chain, so no need to worry about it here. */
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stop_stepping (ecs);
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return;
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@ -2251,10 +2202,6 @@ process_event_stop_test:
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break;
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case BPSTAT_WHAT_THROUGH_SIGTRAMP:
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if (through_sigtramp_breakpoint)
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delete_breakpoint (through_sigtramp_breakpoint);
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through_sigtramp_breakpoint = NULL;
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/* If were waiting for a trap, hitting the step_resume_break
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doesn't count as getting it. */
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if (trap_expected)
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@ -2398,9 +2345,6 @@ process_event_stop_test:
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/* Having a step-resume breakpoint overrides anything
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else having to do with stepping commands until
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that breakpoint is reached. */
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/* I'm not sure whether this needs to be check_sigtramp2 or
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whether it could/should be keep_going. */
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check_sigtramp2 (ecs);
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keep_going (ecs);
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return;
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}
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@ -2408,9 +2352,6 @@ process_event_stop_test:
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if (step_range_end == 0)
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{
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/* Likewise if we aren't even stepping. */
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/* I'm not sure whether this needs to be check_sigtramp2 or
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whether it could/should be keep_going. */
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check_sigtramp2 (ecs);
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keep_going (ecs);
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return;
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}
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@ -2422,9 +2363,6 @@ process_event_stop_test:
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within it! */
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if (stop_pc >= step_range_start && stop_pc < step_range_end)
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{
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/* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal.
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So definately need to check for sigtramp here. */
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check_sigtramp2 (ecs);
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keep_going (ecs);
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return;
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}
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@ -2688,50 +2626,13 @@ process_event_stop_test:
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static int
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currently_stepping (struct execution_control_state *ecs)
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{
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return ((through_sigtramp_breakpoint == NULL
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&& !ecs->handling_longjmp
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return ((!ecs->handling_longjmp
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&& ((step_range_end && step_resume_breakpoint == NULL)
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|| trap_expected))
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|| ecs->stepping_through_solib_after_catch
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|| bpstat_should_step ());
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}
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static void
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check_sigtramp2 (struct execution_control_state *ecs)
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{
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char *name;
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struct symtab_and_line sr_sal;
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/* Check that what has happened here is that we have just stepped
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the inferior with a signal (because it is a signal which
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shouldn't make us stop), thus stepping into sigtramp. */
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if (!trap_expected)
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return;
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if (get_frame_type (get_current_frame ()) != SIGTRAMP_FRAME)
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return;
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/* So we need to set a step_resume_break_address breakpoint and
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continue until we hit it, and then step. FIXME: This should be
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more enduring than a step_resume breakpoint; we should know that
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we will later need to keep going rather than re-hitting the
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breakpoint here (see the testsuite, gdb.base/signals.exp where it
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says "exceedingly difficult"). */
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init_sal (&sr_sal); /* initialize to zeroes */
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sr_sal.pc = prev_pc;
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sr_sal.section = find_pc_overlay (sr_sal.pc);
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/* We perhaps could set the frame if we kept track of what the frame
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corresponding to prev_pc was. But we don't, so don't. */
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through_sigtramp_breakpoint =
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set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp);
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if (breakpoints_inserted)
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insert_breakpoints ();
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ecs->remove_breakpoints_on_following_step = 1;
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ecs->another_trap = 1;
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}
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/* Subroutine call with source code we should not step over. Do step
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to the first line of code in it. */
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@ -2809,6 +2710,38 @@ step_into_function (struct execution_control_state *ecs)
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keep_going (ecs);
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}
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/* The inferior, as a result of a function call (has left) or signal
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(about to leave) the single-step range. Set a momentary breakpoint
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within the step range where the inferior is expected to later
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return. */
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static void
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insert_step_resume_breakpoint (struct frame_info *step_frame,
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struct execution_control_state *ecs)
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{
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struct symtab_and_line sr_sal;
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/* This is only used within the step-resume range/frame. */
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gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame)));
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gdb_assert (step_range_end != 0);
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gdb_assert (get_frame_pc (step_frame) >= step_range_start
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&& get_frame_pc (step_frame) < step_range_end);
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init_sal (&sr_sal); /* initialize to zeros */
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sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame));
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sr_sal.section = find_pc_overlay (sr_sal.pc);
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check_for_old_step_resume_breakpoint ();
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step_resume_breakpoint
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= set_momentary_breakpoint (sr_sal, get_frame_id (step_frame),
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bp_step_resume);
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if (breakpoints_inserted)
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insert_breakpoints ();
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}
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/* We've just entered a callee, and we wish to resume until it returns
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to the caller. Setting a step_resume breakpoint on the return
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address will catch a return from the callee.
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@ -2933,15 +2866,13 @@ keep_going (struct execution_control_state *ecs)
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/* If we've just finished a special step resume and we don't
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want to hit a breakpoint, pull em out. */
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if (step_resume_breakpoint == NULL
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&& through_sigtramp_breakpoint == NULL
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&& ecs->remove_breakpoints_on_following_step)
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{
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ecs->remove_breakpoints_on_following_step = 0;
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remove_breakpoints ();
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breakpoints_inserted = 0;
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}
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else if (!breakpoints_inserted &&
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(through_sigtramp_breakpoint != NULL || !ecs->another_trap))
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else if (!breakpoints_inserted && !ecs->another_trap)
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{
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breakpoints_failed = insert_breakpoints ();
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if (breakpoints_failed)
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@ -1,3 +1,8 @@
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2004-05-10 Andrew Cagney <cagney@redhat.com>
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* gdb.base/signals.exp (signal_tests_1): Simplify "continue to
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func1" and "next to 2nd alarm", kernel bug avoided.
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2004-05-10 Daniel Jacobowitz <dan@debian.org>
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PR external/1568
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@ -60,102 +60,47 @@ proc signal_tests_1 {} {
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# An alarm has been signaled, give the signal time to get delivered.
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sleep 2
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# i386 BSD currently fails the next test with a SIGTRAP.
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setup_xfail "i*86-*-bsd*"
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# But Dynix has a DECR_PC_AFTER_BREAK of zero, so the failure
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# is shadowed by hitting the through_sigtramp_breakpoint.
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clear_xfail "i*86-sequent-bsd*"
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# Univel SVR4 i386 continues instead of stepping.
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setup_xfail "i*86-univel-sysv4*"
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# lynx fails with "next" acting like "continue"
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setup_xfail "*-*-*lynx*"
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# linux (aout versions) also fails with "next" acting like "continue"
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# this is probably more dependant on the kernel version than on the
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# object file format or utils. (sigh)
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setup_xfail "i*86-pc-linuxaout-gnu" "i*86-pc-linuxoldld-gnu"
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send_gdb "next\n"
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gdb_expect {
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-re "alarm .*$gdb_prompt $" { pass "next to 2nd alarm (1)" }
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-re "Program received signal SIGTRAP.*first.*$gdb_prompt $" {
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# NOTE: cagney/2004-05-09: The following is retained as an
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# historical reference. Because signal delivery when doing a
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# next has been changed to use a continue, and not a
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# single-step, the kernel bug of a stuck trace-bit in the
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# trampoline's saved PS register is avoided.
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# This can happen on machines that have a trace flag
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# in their PS register.
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# The trace flag in the PS register will be set due to
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# the `next' command.
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# Before calling the signal handler, the PS register
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# is pushed along with the context on the user stack.
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# When the signal handler has finished, it reenters the
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# the kernel via a sigreturn syscall, which restores the
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# PS register along with the context.
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# If the kernel erroneously does not clear the trace flag
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# in the pushed context, gdb will receive a SIGTRAP from
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# the set trace flag in the restored context after the
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# signal handler has finished.
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# This can happen on machines that have a trace flag in their
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# PS register. The trace flag in the PS register will be set
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# due to the `next' command. Before calling the signal
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# handler, the PS register is pushed along with the context on
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# the user stack. When the signal handler has finished, it
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# reenters the the kernel via a sigreturn syscall, which
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# restores the PS register along with the context. If the
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# kernel erroneously does not clear the trace flag in the
|
||||
# pushed context, gdb will receive a SIGTRAP from the set
|
||||
# trace flag in the restored context after the signal handler
|
||||
# has finished.
|
||||
|
||||
# I do not yet understand why the SIGTRAP does not occur
|
||||
# after stepping the instruction at the restored PC on
|
||||
# i386 BSDI 1.0 systems.
|
||||
# I do not yet understand why the SIGTRAP does not occur after
|
||||
# stepping the instruction at the restored PC on i386 BSDI 1.0
|
||||
# systems.
|
||||
|
||||
# Note that the vax under Ultrix also exhibits
|
||||
# this behaviour (it is uncovered by the `continue from
|
||||
# a break in a signal handler' test below).
|
||||
# With this test the failure is shadowed by hitting the
|
||||
# through_sigtramp_breakpoint upon return from the signal
|
||||
# handler.
|
||||
# Note that the vax under Ultrix also exhibits this behaviour
|
||||
# (it is uncovered by the `continue from a break in a signal
|
||||
# handler' test below). With this test the failure is
|
||||
# shadowed by hitting the through_sigtramp_breakpoint upon
|
||||
# return from the signal handler.
|
||||
|
||||
# SVR4 and Linux based i*86 systems exhibit this behaviour as
|
||||
# well (it is uncovered by the `continue from a break in a
|
||||
# signal handler' test below). As these systems use procfs,
|
||||
# where we tell the kernel not to tell gdb about `pass'
|
||||
# signals, and the trace flag is cleared by the kernel before
|
||||
# entering the sigtramp routine, GDB will not notice the
|
||||
# execution of the signal handler. Upon return from the
|
||||
# signal handler, GDB will receive a SIGTRAP from the set
|
||||
# trace flag in the restored context. The SIGTRAP marks the
|
||||
# end of a (albeit long winded) single step for GDB, causing
|
||||
# this test to pass.
|
||||
|
||||
# SVR4 and Linux based i*86 systems exhibit this behaviour
|
||||
# as well (it is uncovered by the `continue from a break
|
||||
# in a signal handler' test below).
|
||||
# As these systems use procfs, where we tell the kernel not
|
||||
# to tell gdb about `pass' signals, and the trace flag is
|
||||
# cleared by the kernel before entering the sigtramp
|
||||
# routine, GDB will not notice the execution of the signal
|
||||
# handler.
|
||||
# Upon return from the signal handler, GDB will receive
|
||||
# a SIGTRAP from the set trace flag in the restored context.
|
||||
# The SIGTRAP marks the end of a (albeit long winded)
|
||||
# single step for GDB, causing this test to pass.
|
||||
|
||||
fail "next to 2nd alarm (1) (probably kernel bug)"
|
||||
gdb_test "next" "alarm.*" "next to 2nd alarm (1)"
|
||||
}
|
||||
-re "Program exited with code.*$gdb_prompt $" {
|
||||
|
||||
# This is apparently a bug in the UnixWare kernel (but
|
||||
# has not been investigated beyond the
|
||||
# resume/target_wait level, and has not been reported
|
||||
# to Univel). If it steps when a signal is pending,
|
||||
# it does a continue instead. I don't know whether
|
||||
# there is a workaround.
|
||||
|
||||
# Perhaps this problem exists on other SVR4 systems;
|
||||
# but (a) we have no reason to think so, and (b) if we
|
||||
# put a wrong xfail here, we never get an XPASS to let
|
||||
# us know that it was incorrect (and then if such a
|
||||
# configuration regresses we have no way of knowing).
|
||||
# Solaris is not a relevant data point either way
|
||||
# because it lacks single stepping.
|
||||
|
||||
# fnf: I don't agree with the above philosophy. We
|
||||
# can never be sure that any particular XFAIL is
|
||||
# specified 100% correctly in that no systems with
|
||||
# the bug are missed and all systems without the bug
|
||||
# are excluded. If we include an XFAIL that isn't
|
||||
# appropriate for a particular system, then when that
|
||||
# system gets tested it will XPASS, and someone should
|
||||
# investigate and fix the setup_xfail as appropriate,
|
||||
# or more preferably, the actual bug. Each such case
|
||||
# adds more data to narrowing down the scope of the
|
||||
# problem and ultimately fixing it.
|
||||
|
||||
setup_xfail "i*86-*-sysv4*"
|
||||
fail "'next' behaved as 'continue (known SVR4 bug)'"
|
||||
return 0
|
||||
}
|
||||
-re ".*$gdb_prompt $" { fail "next to 2nd alarm (1)" }
|
||||
timeout { fail "next to 2nd alarm (1); (timeout)" }
|
||||
eof { fail "next to 2nd alarm (1); (eof)" }
|
||||
}
|
||||
gdb_test "next" "alarm .*" "next to 2nd alarm"
|
||||
|
||||
gdb_test "break handler" "Breakpoint \[0-9\]+ .*"
|
||||
gdb_test "next" "\\+\\+count; /\\* second \\*/" \
|
||||
@ -191,41 +136,13 @@ proc signal_tests_1 {} {
|
||||
gdb_test "break func1" "Breakpoint \[0-9\]+ .*"
|
||||
gdb_test "break func2" "Breakpoint \[0-9\]+ .*"
|
||||
|
||||
# Vax Ultrix and i386 BSD currently fail the next test with
|
||||
# a SIGTRAP, but with different symptoms.
|
||||
setup_xfail "vax-*-ultrix*"
|
||||
setup_xfail "i*86-*-bsd*"
|
||||
setup_xfail "i*86-*-freebsd*"
|
||||
setup_xfail "i*86-pc-linux-gnu*"
|
||||
setup_xfail "i*86-*-solaris2*"
|
||||
send_gdb "continue\n"
|
||||
gdb_expect {
|
||||
-re "Breakpoint.*func1.*$gdb_prompt $" { pass "continue to func1" }
|
||||
-re "Program received signal SIGTRAP.*second.*$gdb_prompt $" {
|
||||
# NOTE: cagney/2004-05-09: Ref "next to 2nd alarm" above.
|
||||
# Because signal delivery when doing a next has been changed
|
||||
# to use a continue, and not a single-step, the kernel bug of
|
||||
# a stuck trace-bit in the trampoline's saved PS register is
|
||||
# avoided.
|
||||
|
||||
# See explanation for `next to 2nd alarm (1)' fail above.
|
||||
# We did step into the signal handler, hit a breakpoint
|
||||
# in the handler and continued from the breakpoint.
|
||||
# The set trace flag in the restored context is causing
|
||||
# the SIGTRAP, without stepping an instruction.
|
||||
|
||||
fail "continue to func1 (probably kernel bug)"
|
||||
gdb_test "continue" "Breakpoint.*func1.*" \
|
||||
"extra continue to func1"
|
||||
}
|
||||
-re "Program received signal SIGTRAP.*func1 ..;.*$gdb_prompt $" {
|
||||
|
||||
# On the vax under Ultrix the set trace flag in the restored
|
||||
# context is causing the SIGTRAP, but after stepping one
|
||||
# instruction, as expected.
|
||||
|
||||
fail "continue to func1 (probably kernel bug)"
|
||||
gdb_test "continue" "Breakpoint.*func1.*" \
|
||||
"extra continue to func1"
|
||||
}
|
||||
-re ".*$gdb_prompt $" { fail "continue to func1" }
|
||||
default { fail "continue to func1" }
|
||||
}
|
||||
gdb_test "continue" "Breakpoint.*func1.*" "continue to func1"
|
||||
|
||||
setup_xfail "*-*-irix*"
|
||||
send_gdb "signal SIGUSR1\n"
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user