Barf on branches/jumps in branch delay slots. Spotted by Stefan Weil.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2513 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 13 insertions, 5 deletions

diff --git a/target-mips/translate.c b/target-mips/translate.c
index 6ae3c68..b39ec5f 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -1368,12 +1368,20 @@ static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
 static void gen_compute_branch (DisasContext *ctx, uint32_t opc,
                                 int rs, int rt, int32_t offset)
 {
-    target_ulong btarget;
-    int blink, bcond;
+    target_ulong btarget = -1;
+    int blink = 0;
+    int bcond = 0;
+
+    if (ctx->hflags & MIPS_HFLAG_BMASK) {
+        if (loglevel & CPU_LOG_TB_IN_ASM) {
+            fprintf(logfile,
+                    "undefined branch in delay slot at pc 0x%08x\n", ctx->pc);
+	}
+        MIPS_INVAL("branch/jump in bdelay slot");
+        generate_exception(ctx, EXCP_RI);
+        return;
+    }
 
-    btarget = -1;
-    blink = 0;
-    bcond = 0;
     /* Load needed operands */
     switch (opc) {
     case OPC_BEQ: