cris: Consider the TLB valid bit on writes to the TLB

When updating the guest TLB we only need to flush previous
mappings from the entry written if the entry was valid.

Also fixes a compiler warning reported by Blue Swirl.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

diff --git a/target-cris/op_helper.c b/target-cris/op_helper.c
index a60da94f309628df4f4bf9815c769aa1cddd30bf..be9eb06fd06a29fd19e4e2bd3db2cc13d2dde281 100644 (file)
--- a/target-cris/op_helper.c
+++ b/target-cris/op_helper.c
@@ -164,7 +164,9 @@ void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
 
                        D_LOG("tlb flush vaddr=%x v=%d pc=%x\n", 
                                  vaddr, tlb_v, env->pc);
-                       tlb_flush_page(env, vaddr);
+                       if (tlb_v) {
+                               tlb_flush_page(env, vaddr);
+                       }
                }
        }
 #endif