target/arm: Set PSTATE.TCO on exception entry

D1.10 specifies that exception handlers begin with tag checks overridden.

Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Message-id: 20200626033144[email protected]
Signed-off-by: Peter Maydell <[email protected]>

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 23cf44fcf42a445c222172a588ccf3243be1c435..d220612a201e0bf532dd74df9f9cb00bcfb4026b 100644 (file)
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -9704,6 +9704,9 @@ static void arm_cpu_do_interrupt_aarch64(CPUState *cs)
             break;
         }
     }
+    if (cpu_isar_feature(aa64_mte, cpu)) {
+        new_mode |= PSTATE_TCO;
+    }
 
     pstate_write(env, PSTATE_DAIF | new_mode);
     env->aarch64 = 1;