MIPS: Always clear FCSR cause bits after emulation

[firefly-linux-kernel-4.4.55.git] / arch / mips / kernel / traps.c

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index dbfa47cdc8c1a8e04fbfd9a5243dcea265d7aade..4a0552dbcf4a7a756522e37f1cdac0f8c91a47bc 100644 (file)
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -761,6 +761,12 @@ static int simulate_fp(struct pt_regs *regs, unsigned int opcode,
        sig = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 1,
                                       &fault_addr);
 
+       /*
+        * We can't allow the emulated instruction to leave any of
+        * the cause bits set in $fcr31.
+        */
+       current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X;
+
        /* If something went wrong, signal */
        process_fpemu_return(sig, fault_addr);
 
@@ -807,7 +813,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
 
                /*
                 * We can't allow the emulated instruction to leave any of
-                * the cause bit set in $fcr31.
+                * the cause bits set in $fcr31.
                 */
                current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X;
 
@@ -1384,6 +1390,13 @@ asmlinkage void do_cpu(struct pt_regs *regs)
                        sig = fpu_emulator_cop1Handler(regs,
                                                       &current->thread.fpu,
                                                       0, &fault_addr);
+
+                       /*
+                        * We can't allow the emulated instruction to leave
+                        * any of the cause bits set in $fcr31.
+                        */
+                       current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X;
+
                        if (!process_fpemu_return(sig, fault_addr) && !err)
                                mt_ase_fp_affinity();
                }