Signed-off-by: Emilio G. Cota <c...@braap.org> --- target-i386/translate.c | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c index fcccb1a..a5a633b 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -4800,11 +4800,37 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, } break; case 3: /* neg */ - tcg_gen_neg_tl(cpu_T0, cpu_T0); - if (mod != 3) { - gen_op_st_v(s, ot, cpu_T0, cpu_A0); + if (s->prefix & PREFIX_LOCK) { + TCGLabel *label1; + TCGv a0, t0, t1, t2; + + if (mod == 3) { + goto illegal_op; + } + a0 = tcg_temp_local_new(); + t0 = tcg_temp_local_new(); + t1 = tcg_temp_local_new(); + t2 = tcg_temp_new(); + label1 = gen_new_label(); + + tcg_gen_mov_tl(a0, cpu_A0); + gen_set_label(label1); + gen_op_ld_v(s, ot, t0, a0); + tcg_gen_neg_tl(t1, t0); + gen_cmpxchg(t2, a0, t0, t1, ot); + tcg_gen_brcond_tl(TCG_COND_NE, t2, t0, label1); + tcg_temp_free(t2); + tcg_temp_free(a0); + tcg_temp_free(t1); + tcg_gen_mov_tl(cpu_T0, t0); + tcg_temp_free(t0); } else { - gen_op_mov_reg_v(ot, rm, cpu_T0); + tcg_gen_neg_tl(cpu_T0, cpu_T0); + if (mod != 3) { + gen_op_st_v(s, ot, cpu_T0, cpu_A0); + } else { + gen_op_mov_reg_v(ot, rm, cpu_T0); + } } gen_op_update_neg_cc(); set_cc_op(s, CC_OP_SUBB + ot); -- 2.5.0