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target-i386: emulate LOCK'ed NOT using atomic helper

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Backports commit 2a5fe8ae145ef7a3ab480922116d27efcc97b85d from qemu
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Emilio G. Cota 2018-02-27 23:00:32 -05:00 committed by Lioncash
parent 05c94546d5
commit fedeb0f93e
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 20 additions and 6 deletions
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26
qemu/target-i386/translate.c
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@ -5324,10 +5324,15 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
rm = (modrm & 7) | REX_B(s);
op = (modrm >> 3) & 7;
if (mod != 3) {
if (op == 0)
if (op == 0) {
s->rip_offset = insn_const_size(ot);
}
gen_lea_modrm(env, s, modrm);
gen_op_ld_v(s, ot, cpu_T0, cpu_A0);
/* For those below that handle locked memory, don't load here. */
if (!(s->prefix & PREFIX_LOCK)
|| op != 2) {
gen_op_ld_v(s, ot, cpu_T0, cpu_A0);
}
} else {
gen_op_mov_v_reg(tcg_ctx, ot, cpu_T0, rm);
}
@ -5340,11 +5345,20 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
set_cc_op(s, CC_OP_LOGICB + ot);
break;
case 2: /* not */
tcg_gen_not_tl(tcg_ctx, cpu_T0, cpu_T0);
if (mod != 3) {
gen_op_st_v(s, ot, cpu_T0, cpu_A0);
if (s->prefix & PREFIX_LOCK) {
if (mod == 3) {
goto illegal_op;
}
tcg_gen_movi_tl(tcg_ctx, cpu_T0, ~0);
tcg_gen_atomic_xor_fetch_tl(tcg_ctx, cpu_T0, cpu_A0, cpu_T0,
s->mem_index, ot | MO_LE);
} else {
gen_op_mov_reg_v(tcg_ctx, ot, rm, cpu_T0);
tcg_gen_not_tl(tcg_ctx, cpu_T0, cpu_T0);
if (mod != 3) {
gen_op_st_v(s, ot, cpu_T0, cpu_A0);
} else {
gen_op_mov_reg_v(tcg_ctx, ot, rm, cpu_T0);
}
}
break;
case 3: /* neg */