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
