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target-i386: emulate LOCK'ed NEG using cmpxchg helper

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Backports commit 8eb8c7385608b99bed6055a22d897ff727a6cb8e from qemu
This commit is contained in:
Emilio G. Cota 2018-02-27 23:03:26 -05:00 committed by Lioncash
parent fedeb0f93e
commit f9ed728f27
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 34 additions and 4 deletions
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38
qemu/target-i386/translate.c
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@ -5362,11 +5362,41 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
}
break;
case 3: /* neg */
tcg_gen_neg_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) {
TCGLabel *label1;
TCGv a0, t0, t1, t2;
if (mod == 3) {
goto illegal_op;
}
a0 = tcg_temp_local_new(tcg_ctx);
t0 = tcg_temp_local_new(tcg_ctx);
label1 = gen_new_label(tcg_ctx);
tcg_gen_mov_tl(tcg_ctx, a0, cpu_A0);
tcg_gen_mov_tl(tcg_ctx, t0, cpu_T0);
gen_set_label(tcg_ctx, label1);
t1 = tcg_temp_new(tcg_ctx);
t2 = tcg_temp_new(tcg_ctx);
tcg_gen_mov_tl(tcg_ctx, t2, t0);
tcg_gen_neg_tl(tcg_ctx, t1, t0);
tcg_gen_atomic_cmpxchg_tl(tcg_ctx, t0, a0, t0, t1,
s->mem_index, ot | MO_LE);
tcg_temp_free(tcg_ctx, t1);
tcg_gen_brcond_tl(tcg_ctx, TCG_COND_NE, t0, t2, label1);
tcg_temp_free(tcg_ctx, t2);
tcg_temp_free(tcg_ctx, a0);
tcg_gen_mov_tl(tcg_ctx, cpu_T0, t0);
tcg_temp_free(tcg_ctx, t0);
} else {
gen_op_mov_reg_v(tcg_ctx, ot, rm, cpu_T0);
tcg_gen_neg_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);
}
}
gen_op_update_neg_cc(tcg_ctx);
set_cc_op(s, CC_OP_SUBB + ot);