[gdbserver] linux-low.c: better starvation avoidance, handle non-stop mode too
This patch applies the same starvation avoidance improvements of the previous patch to the Linux gdbserver side. Without this, the test added by the following commit (gdb.threads/non-stop-fair-events.exp) always fails with time outs. gdb/gdbserver/ 2015-01-09 Pedro Alves <palves@redhat.com> * linux-low.c (step_over_bkpt): Move higher up in the file. (handle_extended_wait): Don't store the stop_pc here. (get_stop_pc): Adjust comments and rename to ... (check_stopped_by_breakpoint): ... this. Record whether the LWP stopped for a software breakpoint or hardware breakpoint. (thread_still_has_status_pending_p): New function. (status_pending_p_callback): Use thread_still_has_status_pending_p. If the event is no longer interesting, resume the LWP. (handle_tracepoints): Add assert. (maybe_move_out_of_jump_pad): Remove cancel_breakpoints call. (wstatus_maybe_breakpoint): New function. (cancel_breakpoint): Delete function. (check_stopped_by_watchpoint): New function, factored out from linux_low_filter_event. (lp_status_maybe_breakpoint): Delete function. (linux_low_filter_event): Remove filter_ptid argument. Leave thread group exits pending here. Store the LWP's stop PC. Always leave events pending. (linux_wait_for_event_filtered): Pull all events out of the kernel, and leave them all pending. (count_events_callback, select_event_lwp_callback): Consider all events. (cancel_breakpoints_callback, linux_cancel_breakpoints): Delete. (select_event_lwp): Only give preference to the stepping LWP in all-stop mode. Adjust comments. (ignore_event): New function. (linux_wait_1): Delete 'retry' label. Use ignore_event. Remove references to cancel_breakpoints. Adjust to renames. Also give equal priority to all LWPs that have had events in non-stop mode. If reporting a software breakpoint event, unadjust the LWP's PC. (linux_wait): If linux_wait_1 returned an ignored event, retry. (stuck_in_jump_pad_callback, move_out_of_jump_pad_callback): Adjust. (linux_resume_one_lwp): Store the LWP's PC. Adjust. (resume_status_pending_p): Use thread_still_has_status_pending_p. (linux_stopped_by_watchpoint): Adjust. (linux_target_ops): Remove reference to linux_cancel_breakpoints. * linux-low.h (enum lwp_stop_reason): New. (struct lwp_info) <stop_pc>: Adjust comment. <stopped_by_watchpoint>: Delete field. <stop_reason>: New field. * linux-x86-low.c (x86_linux_prepare_to_resume): Adjust. * mem-break.c (software_breakpoint_inserted_here) (hardware_breakpoint_inserted_here): New function. * mem-break.h (software_breakpoint_inserted_here) (hardware_breakpoint_inserted_here): Declare. * target.h (struct target_ops) <cancel_breakpoints>: Remove field. (cancel_breakpoints): Delete. * tracepoint.c (clear_installed_tracepoints, stop_tracing) (upload_fast_traceframes): Remove references to cancel_breakpoints.
This commit is contained in:
Pedro Alves
parent
9c02b52532
commit
582511be69
8 changed files with 518 additions and 358 deletions
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@ -1,3 +1,58 @@
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2015-01-09 Pedro Alves <palves@redhat.com>
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* linux-low.c (step_over_bkpt): Move higher up in the file.
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(handle_extended_wait): Don't store the stop_pc here.
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(get_stop_pc): Adjust comments and rename to ...
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(check_stopped_by_breakpoint): ... this. Record whether the LWP
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stopped for a software breakpoint or hardware breakpoint.
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(thread_still_has_status_pending_p): New function.
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(status_pending_p_callback): Use
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thread_still_has_status_pending_p. If the event is no longer
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interesting, resume the LWP.
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(handle_tracepoints): Add assert.
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(maybe_move_out_of_jump_pad): Remove cancel_breakpoints call.
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(wstatus_maybe_breakpoint): New function.
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(cancel_breakpoint): Delete function.
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(check_stopped_by_watchpoint): New function, factored out from
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linux_low_filter_event.
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(lp_status_maybe_breakpoint): Delete function.
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(linux_low_filter_event): Remove filter_ptid argument.
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Leave thread group exits pending here. Store the LWP's stop PC.
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Always leave events pending.
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(linux_wait_for_event_filtered): Pull all events out of the
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kernel, and leave them all pending.
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(count_events_callback, select_event_lwp_callback): Consider all
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events.
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(cancel_breakpoints_callback, linux_cancel_breakpoints): Delete.
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(select_event_lwp): Only give preference to the stepping LWP in
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all-stop mode. Adjust comments.
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(ignore_event): New function.
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(linux_wait_1): Delete 'retry' label. Use ignore_event. Remove
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references to cancel_breakpoints. Adjust to renames. Also give
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equal priority to all LWPs that have had events in non-stop mode.
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If reporting a software breakpoint event, unadjust the LWP's PC.
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(linux_wait): If linux_wait_1 returned an ignored event, retry.
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(stuck_in_jump_pad_callback, move_out_of_jump_pad_callback):
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Adjust.
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(linux_resume_one_lwp): Store the LWP's PC. Adjust.
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(resume_status_pending_p): Use thread_still_has_status_pending_p.
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(linux_stopped_by_watchpoint): Adjust.
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(linux_target_ops): Remove reference to linux_cancel_breakpoints.
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* linux-low.h (enum lwp_stop_reason): New.
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(struct lwp_info) <stop_pc>: Adjust comment.
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<stopped_by_watchpoint>: Delete field.
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<stop_reason>: New field.
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* linux-x86-low.c (x86_linux_prepare_to_resume): Adjust.
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* mem-break.c (software_breakpoint_inserted_here)
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(hardware_breakpoint_inserted_here): New function.
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* mem-break.h (software_breakpoint_inserted_here)
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(hardware_breakpoint_inserted_here): Declare.
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* target.h (struct target_ops) <cancel_breakpoints>: Remove field.
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(cancel_breakpoints): Delete.
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* tracepoint.c (clear_installed_tracepoints, stop_tracing)
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(upload_fast_traceframes): Remove references to
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cancel_breakpoints.
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2015-01-09 Pedro Alves <palves@redhat.com>
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* thread-db.c (find_new_threads_callback): Ignore thread if the
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File diff suppressed because it is too large
Load diff
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@ -230,6 +230,24 @@ extern struct linux_target_ops the_low_target;
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#define get_thread_lwp(thr) ((struct lwp_info *) (inferior_target_data (thr)))
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#define get_lwp_thread(lwp) ((lwp)->thread)
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/* Reasons an LWP last stopped. */
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enum lwp_stop_reason
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{
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/* Either not stopped, or stopped for a reason that doesn't require
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special tracking. */
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LWP_STOPPED_BY_NO_REASON,
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/* Stopped by a software breakpoint. */
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LWP_STOPPED_BY_SW_BREAKPOINT,
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/* Stopped by a hardware breakpoint. */
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LWP_STOPPED_BY_HW_BREAKPOINT,
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/* Stopped by a watchpoint. */
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LWP_STOPPED_BY_WATCHPOINT
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};
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/* This struct is recorded in the target_data field of struct thread_info.
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On linux ``all_threads'' is keyed by the LWP ID, which we use as the
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@ -269,8 +287,9 @@ struct lwp_info
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/* When stopped is set, the last wait status recorded for this lwp. */
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int last_status;
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/* When stopped is set, this is where the lwp stopped, with
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decr_pc_after_break already accounted for. */
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/* When stopped is set, this is where the lwp last stopped, with
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decr_pc_after_break already accounted for. If the LWP is
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running, this is the address at which the lwp was resumed. */
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CORE_ADDR stop_pc;
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/* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
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@ -278,9 +297,9 @@ struct lwp_info
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int status_pending_p;
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int status_pending;
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/* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
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watchpoint trap. */
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int stopped_by_watchpoint;
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/* The reason the LWP last stopped, if we need to track it
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(breakpoint, watchpoint, etc.) */
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enum lwp_stop_reason stop_reason;
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/* On architectures where it is possible to know the data address of
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a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
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@ -805,7 +805,7 @@ x86_linux_prepare_to_resume (struct lwp_info *lwp)
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lwp->arch_private->debug_registers_changed = 0;
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}
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if (clear_status || lwp->stopped_by_watchpoint)
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if (clear_status || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT)
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x86_linux_dr_set (ptid, DR_STATUS, 0);
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}
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@ -1610,6 +1610,40 @@ breakpoint_inserted_here (CORE_ADDR addr)
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return 0;
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}
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/* See mem-break.h. */
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int
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software_breakpoint_inserted_here (CORE_ADDR addr)
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{
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struct process_info *proc = current_process ();
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struct raw_breakpoint *bp;
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for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
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if (bp->raw_type == raw_bkpt_type_sw
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&& bp->pc == addr
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&& bp->inserted)
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return 1;
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return 0;
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}
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/* See mem-break.h. */
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int
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hardware_breakpoint_inserted_here (CORE_ADDR addr)
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{
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struct process_info *proc = current_process ();
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struct raw_breakpoint *bp;
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for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
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if (bp->raw_type == raw_bkpt_type_hw
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&& bp->pc == addr
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&& bp->inserted)
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return 1;
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return 0;
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}
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static int
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validate_inserted_breakpoint (struct raw_breakpoint *bp)
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{
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@ -90,6 +90,16 @@ int breakpoint_here (CORE_ADDR addr);
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int breakpoint_inserted_here (CORE_ADDR addr);
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/* Returns TRUE if there's any inserted software breakpoint at
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ADDR. */
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int software_breakpoint_inserted_here (CORE_ADDR addr);
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/* Returns TRUE if there's any inserted hardware (code) breakpoint at
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ADDR. */
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int hardware_breakpoint_inserted_here (CORE_ADDR addr);
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/* Clear all breakpoint conditions and commands associated with a
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breakpoint. */
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@ -304,9 +304,6 @@ struct target_ops
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the pause call. */
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void (*unpause_all) (int unfreeze);
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/* Cancel all pending breakpoints hits in all threads. */
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void (*cancel_breakpoints) (void);
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/* Stabilize all threads. That is, force them out of jump pads. */
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void (*stabilize_threads) (void);
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@ -453,13 +450,6 @@ int kill_inferior (int);
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(*the_target->unpause_all) (unfreeze); \
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} while (0)
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#define cancel_breakpoints() \
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do \
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{ \
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if (the_target->cancel_breakpoints) \
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(*the_target->cancel_breakpoints) (); \
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} while (0)
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#define stabilize_threads() \
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do \
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{ \
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@ -2443,7 +2443,6 @@ clear_installed_tracepoints (void)
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struct tracepoint *prev_stpoint;
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pause_all (1);
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cancel_breakpoints ();
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prev_stpoint = NULL;
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@ -3433,9 +3432,6 @@ stop_tracing (void)
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We can't now, since we may be getting here due to the inferior
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agent calling us. */
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pause_all (1);
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/* Since we're removing breakpoints, cancel breakpoint hits,
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possibly related to the breakpoints we're about to delete. */
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cancel_breakpoints ();
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/* Stop logging. Tracepoints can still be hit, but they will not be
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recorded. */
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@ -6538,7 +6534,6 @@ upload_fast_traceframes (void)
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trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx);
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pause_all (1);
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cancel_breakpoints ();
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delete_breakpoint (about_to_request_buffer_space_bkpt);
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about_to_request_buffer_space_bkpt = NULL;
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