csky: Fixup dead loop in show_stack

When STACKTRACE is enabled, we must pass fp as stack for unwind,
otherwise random value in stack will casue a dead loop.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reported-by: Lu Baoquan <lu.baoquan@intellif.com>

diff --git a/arch/csky/kernel/dumpstack.c b/arch/csky/kernel/dumpstack.c
index 659253e9989cb062e84f38c04ce9d4219ebf1d2e..d67f9777cfd9d7a10ca0b439937fd9784f88f8e6 100644 (file)
--- a/arch/csky/kernel/dumpstack.c
+++ b/arch/csky/kernel/dumpstack.c
@@ -38,7 +38,11 @@ void show_stack(struct task_struct *task, unsigned long *stack)
                if (task)
                        stack = (unsigned long *)thread_saved_fp(task);
                else
+#ifdef CONFIG_STACKTRACE
+                       asm volatile("mov %0, r8\n":"=r"(stack)::"memory");
+#else
                        stack = (unsigned long *)&stack;
+#endif
        }
 
        show_trace(stack);