1 files changed, 18 insertions, 0 deletions

diff --git a/arch/mips/include/asm/switch_to.h b/arch/mips/include/asm/switch_to.h
index ebb5c0f2f90d..c0ae27971e31 100644
--- a/arch/mips/include/asm/switch_to.h
+++ b/arch/mips/include/asm/switch_to.h
@@ -76,6 +76,22 @@ do {	if (cpu_has_rw_llb) {						\
 } while (0)
 
 /*
+ * Check FCSR for any unmasked exceptions pending set with `ptrace',
+ * clear them and send a signal.
+ */
+#define __sanitize_fcr31(next)                                          \
+do {                                                                    \
+        unsigned long fcr31 = mask_fcr31_x(next->thread.fpu.fcr31);     \
+        void __user *pc;                                                \
+                                                                        \
+        if (unlikely(fcr31)) {                                          \
+                pc = (void __user *)task_pt_regs(next)->cp0_epc;        \
+                next->thread.fpu.fcr31 &= ~fcr31;                       \
+                force_fcr31_sig(fcr31, pc, next);                       \
+        }                                                               \
+} while (0)
+
+/*
  * For newly created kernel threads switch_to() will return to
  * ret_from_kernel_thread, newly created user threads to ret_from_fork.
  * That is, everything following resume() will be skipped for new threads.
@@ -85,6 +101,8 @@ do {	if (cpu_has_rw_llb) {						\
 do {                                                                    \
         __mips_mt_fpaff_switch_to(prev);                                \
         lose_fpu_inatomic(1, prev);                                     \
+        if (tsk_used_math(next))                                        \
+                __sanitize_fcr31(next);                                 \
         if (cpu_has_dsp) {                                              \
                 __save_dsp(prev);                                       \
                 __restore_dsp(next);                                    \