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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>
This commit is contained in:
Emilio G. Cota 2016-06-27 15:02:04 -04:00 committed by Richard Henderson
parent cfe819d309
commit ea97ebe89f
1 changed files with 2 additions and 6 deletions
target-i386
translate.c

8
target-i386/translate.c
View File

@ -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;