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| author | Yao Qi <yao.qi@linaro.org> | 2016-04-25 09:16:21 +0100 |
|---|---|---|
| committer | Yao Qi <yao.qi@linaro.org> | 2016-04-25 09:16:21 +0100 |
| commit | 21edc42f4e1ec6fe8cfce171232bab27ad4af372 (patch) | |
| tree | e78cffc7c9c92a0492e51e2d0b9b989518ed4e39 /gdb/infrun.h | |
| parent | 101ae4cd3167bcb6fa1becee4f0c3ad1ffc41f15 (diff) | |
| download | gdb-21edc42f4e1ec6fe8cfce171232bab27ad4af372.zip gdb-21edc42f4e1ec6fe8cfce171232bab27ad4af372.tar.gz gdb-21edc42f4e1ec6fe8cfce171232bab27ad4af372.tar.bz2 | |
Force to insert software single step breakpoint
GDB doesn't insert software single step breakpoint if the instruction
branches to itself, so that the program can't stop after command "si".
(gdb) b 32
Breakpoint 2 at 0x8680: file git/gdb/testsuite/gdb.base/branch-to-self.c, line 32.
(gdb) c
Continuing.
Breakpoint 2, main () at gdb/git/gdb/testsuite/gdb.base/branch-to-self.c:32
32 asm (".Lhere: " BRANCH_INSN " .Lhere"); /* loop-line */
(gdb) si
infrun: clear_proceed_status_thread (Thread 3991.3991)
infrun: proceed (addr=0xffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: step-over queue now empty
infrun: resuming [Thread 3991.3991] for step-over
infrun: skipping breakpoint: stepping past insn at: 0x8680
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sending packet: $Z0,8678,4#f3...Packet received: OK
infrun: skipping breakpoint: stepping past insn at: 0x8680
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sending packet: $Z0,b6fe86c8,4#82...Packet received: OK
infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=1, current thread [Thread 3991.3991] at 0x868
breakpoint.c:should_be_inserted thinks the breakpoint shouldn't be
inserted, which is wrong. This patch restrict the condition that
only skip the non-single-step breakpoints if they are inserted at
the place we are stepping over, however we don't want to skip
single-step breakpoint if its thread is the thread we are stepping
over, so in this patch, I add a thread num in 'struct step_over_info'
to record the thread we're stepping over.
gdb:
2016-04-25 Yao Qi <yao.qi@linaro.org>
* breakpoint.c (should_be_inserted): Return 0 if the location's
owner is not single step breakpoint or single step breakpoint's
thread isn't the thread which is stepping past a breakpoint.
* gdbarch.sh (software_single_step): Update comments.
* gdbarch.h: Regenerated.
* infrun.c (struct step_over_info) <thread>: New field.
(set_step_over_info): New argument 'thread'. Callers updated.
(clear_step_over_info): Set field thread to -1.
(thread_is_stepping_over_breakpoint): New function.
* infrun.h (thread_is_stepping_over_breakpoint): Declaration.
Diffstat (limited to 'gdb/infrun.h')
| -rw-r--r-- | gdb/infrun.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gdb/infrun.h b/gdb/infrun.h index 61d3b20..e79bf2d 100644 --- a/gdb/infrun.h +++ b/gdb/infrun.h @@ -133,6 +133,10 @@ 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 thread whose thread number is THREAD is stepping + over a breakpoint. */ +extern int thread_is_stepping_over_breakpoint (int thread); + /* Returns true if we're trying to step past an instruction that triggers a non-steppable watchpoint. */ extern int stepping_past_nonsteppable_watchpoint (void); |