1 files changed, 19 insertions, 0 deletions

diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index e64efac3b9db..bc1e14cf9369 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -381,6 +381,25 @@ static __always_inline unsigned long *stack_pointer(struct task_struct *task)
         return sp;
 }
 
+static inline void spill_registers(void)
+{
+        unsigned int a0, ps;
+
+        __asm__ __volatile__ (
+                "movi   a14," __stringify (PS_EXCM_BIT) " | 1\n\t"
+                "mov    a12, a0\n\t"
+                "rsr    a13," __stringify(SAR) "\n\t"
+                "xsr    a14," __stringify(PS) "\n\t"
+                "movi   a0, _spill_registers\n\t"
+                "rsync\n\t"
+                "callx0 a0\n\t"
+                "mov    a0, a12\n\t"
+                "wsr    a13," __stringify(SAR) "\n\t"
+                "wsr    a14," __stringify(PS) "\n\t"
+                :: "a" (&a0), "a" (&ps)
+                : "a2", "a3", "a4", "a7", "a11", "a12", "a13", "a14", "a15", "memory");
+}
+
 void show_trace(struct task_struct *task, unsigned long *sp)
 {
         unsigned long a0, a1, pc;