Signed-off-by: Emilio G. Cota <c...@braap.org> --- target-i386/translate.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c index a5a633b..7df744e 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -1314,6 +1314,7 @@ glue(gen_atomic_, NAME)(TCGv ret, TCGv addr, TCGv reg, TCGMemOp ot) \ } #endif /* TARGET_X86_64 */ +GEN_ATOMIC_HELPER(fetch_add) GEN_ATOMIC_HELPER(fetch_sub) GEN_ATOMIC_HELPER(add_fetch) @@ -5227,10 +5228,16 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, gen_op_mov_reg_v(ot, rm, cpu_T0); } else { gen_lea_modrm(env, s, modrm); - gen_op_mov_v_reg(ot, cpu_T0, reg); - gen_op_ld_v(s, ot, cpu_T1, cpu_A0); - tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); - gen_op_st_v(s, ot, cpu_T0, cpu_A0); + if (s->prefix & PREFIX_LOCK) { + gen_op_mov_v_reg(ot, cpu_T0, reg); + gen_atomic_fetch_add(cpu_T1, cpu_A0, cpu_T0, ot); + tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); + } else { + gen_op_ld_v(s, ot, cpu_T1, cpu_A0); + gen_op_mov_v_reg(ot, cpu_T0, reg); + tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); + gen_op_st_v(s, ot, cpu_T0, cpu_A0); + } gen_op_mov_reg_v(ot, reg, cpu_T1); } gen_op_update2_cc(); -- 2.5.0