MIPS: Use per-mm page to execute branch delay slot instructions

[cascardo/linux.git] / arch / mips / kernel / signal.c

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index ae42314..9383635 100644 (file)
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -772,6 +772,14 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
        struct mips_abi *abi = current->thread.abi;
        void *vdso = current->mm->context.vdso;
 
+       /*
+        * If we were emulating a delay slot instruction, exit that frame such
+        * that addresses in the sigframe are as expected for userland and we
+        * don't have a problem if we reuse the thread's frame for an
+        * instruction within the signal handler.
+        */
+       dsemul_thread_rollback(regs);
+
        if (regs->regs[0]) {
                switch(regs->regs[2]) {
                case ERESTART_RESTARTBLOCK: