From e2456a83a4fcf97f67faf5152f4b29d3e7b529d2 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Thu, 25 Feb 2021 22:41:25 -0500
Subject: [PATCH] target/arm: Set PSTATE.TCO on exception entry

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

Backports commit 34669338bd9d66255fceaa84c314251ca49ca8d5 from qemu
---
 qemu/target/arm/helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qemu/target/arm/helper.c b/qemu/target/arm/helper.c
index 71b48aa5..492ffb0b 100644
--- a/qemu/target/arm/helper.c
+++ b/qemu/target/arm/helper.c
@@ -9384,6 +9384,9 @@ 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;