From fb1988190eb2290a222acb1d5ffe679a2e753d67 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Sat, 21 Mar 2020 11:32:58 -0400
Subject: [PATCH] target/arm: Fix sign-extension for SMLAL*

The 32-bit product should be sign-extended, not zero-extended.

Fixes: ea96b37

Backports commit 1ab170865202aab8301131f31bffd87ea0f60d16 from qemu
---
 qemu/target/arm/translate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/qemu/target/arm/translate.c b/qemu/target/arm/translate.c
index bc0c9ca7..19aebd46 100644
--- a/qemu/target/arm/translate.c
+++ b/qemu/target/arm/translate.c
@@ -8335,7 +8335,8 @@ static bool op_smlaxxx(DisasContext *s, arg_rrrr *a,
     case 2:
         tl = load_reg(s, a->ra);
         th = load_reg(s, a->rd);
-        t1 = tcg_const_i32(tcg_ctx, 0);
+        t1 = tcg_temp_new_i32(tcg_ctx);
+        tcg_gen_sari_i32(tcg_ctx, t1, t0, 31);
         tcg_gen_add2_i32(tcg_ctx, tl, th, tl, th, t0, t1);
         tcg_temp_free_i32(tcg_ctx, t0);
         tcg_temp_free_i32(tcg_ctx, t1);