arm: Use the mmu_idx we're passed in arm_cpu_do_unaligned_access()

When identifying the DFSR format for an alignment fault, use
the mmu index that we are passed, rather than calling cpu_mmu_index()
to get the mmu index for the current CPU state. This doesn't actually
make any difference since the only cases where the current MMU index
differs from the index used for the load are the "unprivileged
load/store" instructions, and in that case the mmu index may
differ but the translation regime is the same (apart from the
"use from Hyp mode" case which is UNPREDICTABLE).
However it's the more logical thing to do.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 1493122030-32191-2-git-send-email-peter.maydell@linaro.org

diff --git a/target/arm/op_helper.c b/target/arm/op_helper.c
index 156b8250407a464e5a051897216f8ba110171bc2..de2481598a6102b0c63f2ad737f68aae9723eb04 100644 (file)
--- a/target/arm/op_helper.c
+++ b/target/arm/op_helper.c
@@ -208,7 +208,7 @@ void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
     /* the DFSR for an alignment fault depends on whether we're using
      * the LPAE long descriptor format, or the short descriptor format
      */
-    if (arm_s1_regime_using_lpae_format(env, cpu_mmu_index(env, false))) {
+    if (arm_s1_regime_using_lpae_format(env, mmu_idx)) {
         env->exception.fsr = (1 << 9) | 0x21;
     } else {
         env->exception.fsr = 0x1;