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| author | Bernd Schmidt <bernds_cb1@t-online.de> | 2008-05-07 11:41:26 +0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2008-05-07 11:41:26 +0800 |
| commit | 8513c42edb3f1c91a8418fae11846c87cf7b8581 (patch) | |
| tree | d8e4b855507413b55a0097aa86885d8e3fd037c6 /arch/blackfin | |
| parent | 7d39270d31b91647722823a0919164dea9fd4ad7 (diff) | |
| download | linux-8513c42edb3f1c91a8418fae11846c87cf7b8581.tar.gz linux-8513c42edb3f1c91a8418fae11846c87cf7b8581.tar.bz2 linux-8513c42edb3f1c91a8418fae11846c87cf7b8581.zip | |
[Blackfin] arch: disable single stepping when delivering a signal
When delivering a signal, disable single stepping but call
ptrace_notify if it was enabled before. The idea was taken
from the x86 port.
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/kernel/signal.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c index cb9d883d493c..dbc3bbf846be 100644 --- a/arch/blackfin/kernel/signal.c +++ b/arch/blackfin/kernel/signal.c @@ -42,6 +42,9 @@ #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) +/* Location of the trace bit in SYSCFG. */ +#define TRACE_BITS 0x0001 + struct fdpic_func_descriptor { unsigned long text; unsigned long GOT; @@ -225,6 +228,16 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t * info, regs->r1 = (unsigned long)(&frame->info); regs->r2 = (unsigned long)(&frame->uc); + /* + * Clear the trace flag when entering the signal handler, but + * notify any tracer that was single-stepping it. The tracer + * may want to single-step inside the handler too. + */ + if (regs->syscfg & TRACE_BITS) { + regs->syscfg &= ~TRACE_BITS; + ptrace_notify(SIGTRAP); + } + return 0; give_sigsegv: |