From ea97ebe89f7a879ea9aba90140e40c29b5cbd653 Mon Sep 17 00:00:00 2001
From: "Emilio G. Cota" <cota@braap.org>
Date: Mon, 27 Jun 2016 15:02:04 -0400
Subject: [PATCH] target-i386: emulate XCHG using atomic helper
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-19-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
target-i386/translate.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index b3cb4c5f64..cfa3956543 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -5564,12 +5564,8 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_lea_modrm(env, s, modrm);
gen_op_mov_v_reg(ot, cpu_T0, reg);
/* for xchg, lock is implicit */
- if (!(prefixes & PREFIX_LOCK))
- gen_helper_lock();
- gen_op_ld_v(s, ot, cpu_T1, cpu_A0);
- gen_op_st_v(s, ot, cpu_T0, cpu_A0);
- if (!(prefixes & PREFIX_LOCK))
- gen_helper_unlock();
+ tcg_gen_atomic_xchg_tl(cpu_T1, cpu_A0, cpu_T0,
+ s->mem_index, ot | MO_LE);
gen_op_mov_reg_v(ot, reg, cpu_T1);
}
break;