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-rw-r--r--arch/xtensa/kernel/traps.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 9f0b711..ba9ab93 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -369,6 +369,18 @@ void show_regs(struct pt_regs * regs)
regs->syscall);
}
+static __always_inline unsigned long *stack_pointer(struct task_struct *task)
+{
+ unsigned long *sp;
+
+ if (!task || task == current)
+ __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
+ else
+ sp = (unsigned long *)task->thread.sp;
+
+ return sp;
+}
+
void show_trace(struct task_struct *task, unsigned long *sp)
{
unsigned long a0, a1, pc;
@@ -377,7 +389,7 @@ void show_trace(struct task_struct *task, unsigned long *sp)
if (sp)
a1 = (unsigned long)sp;
else
- a1 = task->thread.sp;
+ a1 = (unsigned long)stack_pointer(task);
sp_start = a1 & ~(THREAD_SIZE-1);
sp_end = sp_start + THREAD_SIZE;
@@ -420,7 +432,7 @@ void show_stack(struct task_struct *task, unsigned long *sp)
unsigned long *stack;
if (!sp)
- sp = (unsigned long *)task->thread.sp;
+ sp = stack_pointer(task);
stack = sp;
printk("\nStack: ");
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