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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>
This commit is contained in:
Guo Ren 2019-01-31 14:34:37 +08:00
parent 76d21d186a
commit 131aee8b98
1 changed files with 4 additions and 0 deletions
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4
arch/csky/kernel/dumpstack.c
View File

@ -38,7 +38,11 @@ void show_stack(struct task_struct *task, unsigned long *stack)
if (task) if (task)
stack = (unsigned long *)thread_saved_fp(task); stack = (unsigned long *)thread_saved_fp(task);
else else
#ifdef CONFIG_STACKTRACE
asm volatile("mov %0, r8\n":"=r"(stack)::"memory");
#else
stack = (unsigned long *)&stack; stack = (unsigned long *)&stack;
#endif
} }
show_trace(stack); show_trace(stack);