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-rw-r--r--arch/blackfin/kernel/signal.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/signal.c b/arch/blackfin/kernel/signal.c
index cb9d883d493..dbc3bbf846b 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: