Commit ea97ebe8 authored by Emilio G. Cota's avatar Emilio G. Cota Committed by Richard Henderson
Browse files

target-i386: emulate XCHG using atomic helper 



Signed-off-by: default avatarEmilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-19-git-send-email-cota@braap.org>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent cfe819d3

target-i386/translate.c

+2 −6
Original line number Diff line number Diff line
@@ -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;