[PATCH v2 2/2] target/arm: Fill in the WnR syndrome bit in mte_check_fail

[Richard Henderson]

According to AArch64.TagCheckFault, none of the other ISS values are
provided, so we do not need to go so far as merge_syn_data_abort.
But we were missing the WnR bit.

Tested-by: Andrey Konovalov <andreyknvl@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/mte_helper.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/target/arm/mte_helper.c b/target/arm/mte_helper.c
index a40454588d..891306f5b0 100644
--- a/target/arm/mte_helper.c
+++ b/target/arm/mte_helper.c
@@ -519,7 +519,7 @@ static void mte_check_fail(CPUARMState *env, uint32_t desc,
 {
     int mmu_idx = FIELD_EX32(desc, MTEDESC, MIDX);
     ARMMMUIdx arm_mmu_idx = core_to_aa64_mmu_idx(mmu_idx);
-    int el, reg_el, tcf, select;
+    int el, reg_el, tcf, select, is_write, syn;
     uint64_t sctlr;
 
     reg_el = regime_el(env, arm_mmu_idx);
@@ -547,9 +547,10 @@ static void mte_check_fail(CPUARMState *env, uint32_t desc,
          */
         cpu_restore_state(env_cpu(env), ra, true);
         env->exception.vaddress = dirty_ptr;
-        raise_exception(env, EXCP_DATA_ABORT,
-                        syn_data_abort_no_iss(el != 0, 0, 0, 0, 0, 0, 0x11),
-                        exception_target_el(env));
+
+        is_write = FIELD_EX32(desc, MTEDESC, WRITE);
+        syn = syn_data_abort_no_iss(el != 0, 0, 0, 0, 0, is_write, 0x11);
+        raise_exception(env, EXCP_DATA_ABORT, syn, exception_target_el(env));
         /* noreturn, but fall through to the assert anyway */
 
     case 0:
-- 
2.25.1