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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-03-14 12:01:08 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-03-14 12:59:38 +0100 |
| commit | 818a330c4e1be9c39fa7ca9221e044907d92b4bb (patch) | |
| tree | 1341793bde170543839a96a71fd72350c8f04c1d /arch/s390/kernel/ptrace.c | |
| parent | s390/perf: make print_debug_cf() static (diff) | |
| download | linux-dev-818a330c4e1be9c39fa7ca9221e044907d92b4bb.tar.xz linux-dev-818a330c4e1be9c39fa7ca9221e044907d92b4bb.zip | |
s390/ptrace: add support for PTRACE_SINGLEBLOCK
The PTRACE_SINGLEBLOCK option is used to get control whenever
the inferior has executed a successful branch. The PER option to
implement block stepping is successful-branching event, bit 32
in the PER-event mask.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/ptrace.c')
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index f6be6087a0e9..4ac8fafec95f 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -85,7 +85,10 @@ void update_cr_regs(struct task_struct *task) /* merge TIF_SINGLE_STEP into user specified PER registers. */ if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) { - new.control |= PER_EVENT_IFETCH; + if (test_tsk_thread_flag(task, TIF_BLOCK_STEP)) + new.control |= PER_EVENT_BRANCH; + else + new.control |= PER_EVENT_IFETCH; #ifdef CONFIG_64BIT new.control |= PER_CONTROL_SUSPENSION; new.control |= PER_EVENT_TRANSACTION_END; @@ -107,14 +110,22 @@ void update_cr_regs(struct task_struct *task) void user_enable_single_step(struct task_struct *task) { + clear_tsk_thread_flag(task, TIF_BLOCK_STEP); set_tsk_thread_flag(task, TIF_SINGLE_STEP); } void user_disable_single_step(struct task_struct *task) { + clear_tsk_thread_flag(task, TIF_BLOCK_STEP); clear_tsk_thread_flag(task, TIF_SINGLE_STEP); } +void user_enable_block_step(struct task_struct *task) +{ + set_tsk_thread_flag(task, TIF_SINGLE_STEP); + set_tsk_thread_flag(task, TIF_BLOCK_STEP); +} + /* * Called by kernel/ptrace.c when detaching.. * |