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target-i386: emulate LOCK'ed OP instructions using atomic helpers 

[rth: Eliminate some unnecessary temporaries.]

Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-13-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2016-06-27 15:01:58 -04:00 committed by Richard Henderson
parent ae03f8de45
commit a7cee522f3
1 changed files with 58 additions and 18 deletions
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76
target-i386/translate.c
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@ -1257,55 +1257,95 @@ static void gen_op(DisasContext *s1, int op, TCGMemOp ot, int d)
{
if (d != OR_TMP0) {
gen_op_mov_v_reg(ot, cpu_T0, d);
} else {
} else if (!(s1->prefix & PREFIX_LOCK)) {
gen_op_ld_v(s1, ot, cpu_T0, cpu_A0);
}
switch(op) {
case OP_ADCL:
gen_compute_eflags_c(s1, cpu_tmp4);
tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1);
tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_tmp4);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_add_tl(cpu_T0, cpu_tmp4, cpu_T1);
tcg_gen_atomic_add_fetch_tl(cpu_T0, cpu_A0, cpu_T0,
s1->mem_index, ot | MO_LE);
} else {
tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1);
tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_tmp4);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update3_cc(cpu_tmp4);
set_cc_op(s1, CC_OP_ADCB + ot);
break;
case OP_SBBL:
gen_compute_eflags_c(s1, cpu_tmp4);
tcg_gen_sub_tl(cpu_T0, cpu_T0, cpu_T1);
tcg_gen_sub_tl(cpu_T0, cpu_T0, cpu_tmp4);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_add_tl(cpu_T0, cpu_T1, cpu_tmp4);
tcg_gen_neg_tl(cpu_T0, cpu_T0);
tcg_gen_atomic_add_fetch_tl(cpu_T0, cpu_A0, cpu_T0,
s1->mem_index, ot | MO_LE);
} else {
tcg_gen_sub_tl(cpu_T0, cpu_T0, cpu_T1);
tcg_gen_sub_tl(cpu_T0, cpu_T0, cpu_tmp4);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update3_cc(cpu_tmp4);
set_cc_op(s1, CC_OP_SBBB + ot);
break;
case OP_ADDL:
tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_atomic_add_fetch_tl(cpu_T0, cpu_A0, cpu_T1,
s1->mem_index, ot | MO_LE);
} else {
tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update2_cc();
set_cc_op(s1, CC_OP_ADDB + ot);
break;
case OP_SUBL:
tcg_gen_mov_tl(cpu_cc_srcT, cpu_T0);
tcg_gen_sub_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_neg_tl(cpu_T0, cpu_T1);
tcg_gen_atomic_fetch_add_tl(cpu_cc_srcT, cpu_A0, cpu_T0,
s1->mem_index, ot | MO_LE);
tcg_gen_sub_tl(cpu_T0, cpu_cc_srcT, cpu_T1);
} else {
tcg_gen_mov_tl(cpu_cc_srcT, cpu_T0);
tcg_gen_sub_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update2_cc();
set_cc_op(s1, CC_OP_SUBB + ot);
break;
default:
case OP_ANDL:
tcg_gen_and_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_atomic_and_fetch_tl(cpu_T0, cpu_A0, cpu_T1,
s1->mem_index, ot | MO_LE);
} else {
tcg_gen_and_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update1_cc();
set_cc_op(s1, CC_OP_LOGICB + ot);
break;
case OP_ORL:
tcg_gen_or_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_atomic_or_fetch_tl(cpu_T0, cpu_A0, cpu_T1,
s1->mem_index, ot | MO_LE);
} else {
tcg_gen_or_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update1_cc();
set_cc_op(s1, CC_OP_LOGICB + ot);
break;
case OP_XORL:
tcg_gen_xor_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
if (s1->prefix & PREFIX_LOCK) {
tcg_gen_atomic_xor_fetch_tl(cpu_T0, cpu_A0, cpu_T1,
s1->mem_index, ot | MO_LE);
} else {
tcg_gen_xor_tl(cpu_T0, cpu_T0, cpu_T1);
gen_op_st_rm_T0_A0(s1, ot, d);
}
gen_op_update1_cc();
set_cc_op(s1, CC_OP_LOGICB + ot);
break;