mirror of https://gitee.com/openkylin/qemu.git
596 lines
13 KiB
C
596 lines
13 KiB
C
/*
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* S/390 condition code helper routines
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*
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* Copyright (c) 2009 Ulrich Hecht
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* Copyright (c) 2009 Alexander Graf
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "internal.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include "qemu/host-utils.h"
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/* #define DEBUG_HELPER */
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#ifdef DEBUG_HELPER
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#define HELPER_LOG(x...) qemu_log(x)
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#else
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#define HELPER_LOG(x...)
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#endif
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static uint32_t cc_calc_ltgt_32(int32_t src, int32_t dst)
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{
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if (src == dst) {
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return 0;
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} else if (src < dst) {
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return 1;
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} else {
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return 2;
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}
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}
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static uint32_t cc_calc_ltgt0_32(int32_t dst)
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{
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return cc_calc_ltgt_32(dst, 0);
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}
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static uint32_t cc_calc_ltgt_64(int64_t src, int64_t dst)
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{
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if (src == dst) {
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return 0;
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} else if (src < dst) {
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return 1;
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} else {
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return 2;
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}
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}
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static uint32_t cc_calc_ltgt0_64(int64_t dst)
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{
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return cc_calc_ltgt_64(dst, 0);
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}
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static uint32_t cc_calc_ltugtu_32(uint32_t src, uint32_t dst)
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{
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if (src == dst) {
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return 0;
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} else if (src < dst) {
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return 1;
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} else {
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return 2;
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}
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}
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static uint32_t cc_calc_ltugtu_64(uint64_t src, uint64_t dst)
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{
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if (src == dst) {
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return 0;
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} else if (src < dst) {
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return 1;
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} else {
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return 2;
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}
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}
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static uint32_t cc_calc_tm_32(uint32_t val, uint32_t mask)
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{
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uint32_t r = val & mask;
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if (r == 0) {
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return 0;
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} else if (r == mask) {
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return 3;
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} else {
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return 1;
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}
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}
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static uint32_t cc_calc_tm_64(uint64_t val, uint64_t mask)
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{
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uint64_t r = val & mask;
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if (r == 0) {
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return 0;
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} else if (r == mask) {
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return 3;
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} else {
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int top = clz64(mask);
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if ((int64_t)(val << top) < 0) {
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return 2;
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} else {
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return 1;
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}
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}
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}
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static uint32_t cc_calc_nz(uint64_t dst)
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{
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return !!dst;
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}
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static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar)
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{
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if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
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return 3; /* overflow */
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} else {
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if (ar < 0) {
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return 1;
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} else if (ar > 0) {
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return 2;
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} else {
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return 0;
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}
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}
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}
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static uint32_t cc_calc_addu_64(uint64_t a1, uint64_t a2, uint64_t ar)
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{
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return (ar != 0) + 2 * (ar < a1);
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}
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static uint32_t cc_calc_addc_64(uint64_t a1, uint64_t a2, uint64_t ar)
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{
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/* Recover a2 + carry_in. */
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uint64_t a2c = ar - a1;
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/* Check for a2+carry_in overflow, then a1+a2c overflow. */
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int carry_out = (a2c < a2) || (ar < a1);
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return (ar != 0) + 2 * carry_out;
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}
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static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar)
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{
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if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
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return 3; /* overflow */
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} else {
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if (ar < 0) {
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return 1;
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} else if (ar > 0) {
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return 2;
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} else {
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return 0;
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}
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}
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}
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static uint32_t cc_calc_subu_64(uint64_t a1, uint64_t a2, uint64_t ar)
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{
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if (ar == 0) {
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return 2;
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} else {
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if (a2 > a1) {
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return 1;
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} else {
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return 3;
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}
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}
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}
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static uint32_t cc_calc_subb_64(uint64_t a1, uint64_t a2, uint64_t ar)
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{
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int borrow_out;
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if (ar != a1 - a2) { /* difference means borrow-in */
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borrow_out = (a2 >= a1);
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} else {
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borrow_out = (a2 > a1);
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}
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return (ar != 0) + 2 * !borrow_out;
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}
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static uint32_t cc_calc_abs_64(int64_t dst)
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{
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if ((uint64_t)dst == 0x8000000000000000ULL) {
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return 3;
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} else if (dst) {
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return 2;
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} else {
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return 0;
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}
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}
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static uint32_t cc_calc_nabs_64(int64_t dst)
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{
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return !!dst;
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}
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static uint32_t cc_calc_comp_64(int64_t dst)
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{
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if ((uint64_t)dst == 0x8000000000000000ULL) {
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return 3;
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} else if (dst < 0) {
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return 1;
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} else if (dst > 0) {
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return 2;
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} else {
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return 0;
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}
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}
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static uint32_t cc_calc_add_32(int32_t a1, int32_t a2, int32_t ar)
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{
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if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
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return 3; /* overflow */
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} else {
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if (ar < 0) {
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return 1;
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} else if (ar > 0) {
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return 2;
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} else {
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return 0;
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}
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}
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}
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static uint32_t cc_calc_addu_32(uint32_t a1, uint32_t a2, uint32_t ar)
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{
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return (ar != 0) + 2 * (ar < a1);
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}
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static uint32_t cc_calc_addc_32(uint32_t a1, uint32_t a2, uint32_t ar)
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{
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/* Recover a2 + carry_in. */
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uint32_t a2c = ar - a1;
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/* Check for a2+carry_in overflow, then a1+a2c overflow. */
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int carry_out = (a2c < a2) || (ar < a1);
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return (ar != 0) + 2 * carry_out;
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}
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static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar)
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{
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if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
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return 3; /* overflow */
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} else {
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if (ar < 0) {
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return 1;
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} else if (ar > 0) {
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return 2;
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} else {
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return 0;
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}
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}
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}
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static uint32_t cc_calc_subu_32(uint32_t a1, uint32_t a2, uint32_t ar)
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{
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if (ar == 0) {
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return 2;
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} else {
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if (a2 > a1) {
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return 1;
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} else {
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return 3;
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}
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}
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}
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static uint32_t cc_calc_subb_32(uint32_t a1, uint32_t a2, uint32_t ar)
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{
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int borrow_out;
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if (ar != a1 - a2) { /* difference means borrow-in */
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borrow_out = (a2 >= a1);
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} else {
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borrow_out = (a2 > a1);
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}
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return (ar != 0) + 2 * !borrow_out;
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}
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static uint32_t cc_calc_abs_32(int32_t dst)
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{
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if ((uint32_t)dst == 0x80000000UL) {
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return 3;
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} else if (dst) {
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return 2;
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} else {
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return 0;
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}
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}
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static uint32_t cc_calc_nabs_32(int32_t dst)
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{
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return !!dst;
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}
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static uint32_t cc_calc_comp_32(int32_t dst)
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{
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if ((uint32_t)dst == 0x80000000UL) {
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return 3;
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} else if (dst < 0) {
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return 1;
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} else if (dst > 0) {
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return 2;
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} else {
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return 0;
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}
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}
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/* calculate condition code for insert character under mask insn */
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static uint32_t cc_calc_icm(uint64_t mask, uint64_t val)
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{
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if ((val & mask) == 0) {
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return 0;
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} else {
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int top = clz64(mask);
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if ((int64_t)(val << top) < 0) {
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return 1;
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} else {
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return 2;
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}
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}
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}
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static uint32_t cc_calc_sla_32(uint32_t src, int shift)
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{
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uint32_t mask = ((1U << shift) - 1U) << (32 - shift);
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uint32_t sign = 1U << 31;
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uint32_t match;
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int32_t r;
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/* Check if the sign bit stays the same. */
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if (src & sign) {
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match = mask;
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} else {
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match = 0;
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}
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if ((src & mask) != match) {
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/* Overflow. */
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return 3;
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}
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r = ((src << shift) & ~sign) | (src & sign);
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if (r == 0) {
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return 0;
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} else if (r < 0) {
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return 1;
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}
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return 2;
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}
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static uint32_t cc_calc_sla_64(uint64_t src, int shift)
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{
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uint64_t mask = ((1ULL << shift) - 1ULL) << (64 - shift);
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uint64_t sign = 1ULL << 63;
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uint64_t match;
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int64_t r;
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/* Check if the sign bit stays the same. */
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if (src & sign) {
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match = mask;
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} else {
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match = 0;
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}
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if ((src & mask) != match) {
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/* Overflow. */
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return 3;
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}
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r = ((src << shift) & ~sign) | (src & sign);
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if (r == 0) {
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return 0;
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} else if (r < 0) {
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return 1;
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}
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return 2;
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}
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static uint32_t cc_calc_flogr(uint64_t dst)
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{
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return dst ? 2 : 0;
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}
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static uint32_t cc_calc_lcbb(uint64_t dst)
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{
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return dst == 16 ? 0 : 3;
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}
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static uint32_t cc_calc_vc(uint64_t low, uint64_t high)
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{
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if (high == -1ull && low == -1ull) {
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/* all elements match */
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return 0;
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} else if (high == 0 && low == 0) {
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/* no elements match */
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return 3;
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} else {
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/* some elements but not all match */
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return 1;
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}
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}
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static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op,
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uint64_t src, uint64_t dst, uint64_t vr)
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{
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uint32_t r = 0;
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switch (cc_op) {
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case CC_OP_CONST0:
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case CC_OP_CONST1:
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case CC_OP_CONST2:
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case CC_OP_CONST3:
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/* cc_op value _is_ cc */
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r = cc_op;
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break;
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case CC_OP_LTGT0_32:
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r = cc_calc_ltgt0_32(dst);
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break;
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case CC_OP_LTGT0_64:
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r = cc_calc_ltgt0_64(dst);
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break;
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case CC_OP_LTGT_32:
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r = cc_calc_ltgt_32(src, dst);
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break;
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case CC_OP_LTGT_64:
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r = cc_calc_ltgt_64(src, dst);
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break;
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case CC_OP_LTUGTU_32:
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r = cc_calc_ltugtu_32(src, dst);
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break;
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case CC_OP_LTUGTU_64:
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r = cc_calc_ltugtu_64(src, dst);
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break;
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case CC_OP_TM_32:
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r = cc_calc_tm_32(src, dst);
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break;
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case CC_OP_TM_64:
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r = cc_calc_tm_64(src, dst);
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break;
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case CC_OP_NZ:
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r = cc_calc_nz(dst);
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break;
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case CC_OP_ADD_64:
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r = cc_calc_add_64(src, dst, vr);
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break;
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case CC_OP_ADDU_64:
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r = cc_calc_addu_64(src, dst, vr);
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break;
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case CC_OP_ADDC_64:
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r = cc_calc_addc_64(src, dst, vr);
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break;
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case CC_OP_SUB_64:
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r = cc_calc_sub_64(src, dst, vr);
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break;
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case CC_OP_SUBU_64:
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r = cc_calc_subu_64(src, dst, vr);
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break;
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case CC_OP_SUBB_64:
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r = cc_calc_subb_64(src, dst, vr);
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break;
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case CC_OP_ABS_64:
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r = cc_calc_abs_64(dst);
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break;
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case CC_OP_NABS_64:
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r = cc_calc_nabs_64(dst);
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break;
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case CC_OP_COMP_64:
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r = cc_calc_comp_64(dst);
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break;
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case CC_OP_ADD_32:
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r = cc_calc_add_32(src, dst, vr);
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break;
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case CC_OP_ADDU_32:
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r = cc_calc_addu_32(src, dst, vr);
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break;
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case CC_OP_ADDC_32:
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r = cc_calc_addc_32(src, dst, vr);
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break;
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case CC_OP_SUB_32:
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r = cc_calc_sub_32(src, dst, vr);
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break;
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case CC_OP_SUBU_32:
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r = cc_calc_subu_32(src, dst, vr);
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break;
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case CC_OP_SUBB_32:
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r = cc_calc_subb_32(src, dst, vr);
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break;
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case CC_OP_ABS_32:
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r = cc_calc_abs_32(dst);
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break;
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case CC_OP_NABS_32:
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r = cc_calc_nabs_32(dst);
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break;
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case CC_OP_COMP_32:
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r = cc_calc_comp_32(dst);
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break;
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case CC_OP_ICM:
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r = cc_calc_icm(src, dst);
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break;
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case CC_OP_SLA_32:
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r = cc_calc_sla_32(src, dst);
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break;
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case CC_OP_SLA_64:
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r = cc_calc_sla_64(src, dst);
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break;
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case CC_OP_FLOGR:
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r = cc_calc_flogr(dst);
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break;
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case CC_OP_LCBB:
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r = cc_calc_lcbb(dst);
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break;
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case CC_OP_VC:
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r = cc_calc_vc(src, dst);
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break;
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case CC_OP_NZ_F32:
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r = set_cc_nz_f32(dst);
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break;
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case CC_OP_NZ_F64:
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r = set_cc_nz_f64(dst);
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break;
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case CC_OP_NZ_F128:
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r = set_cc_nz_f128(make_float128(src, dst));
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break;
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default:
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cpu_abort(env_cpu(env), "Unknown CC operation: %s\n", cc_name(cc_op));
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}
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HELPER_LOG("%s: %15s 0x%016lx 0x%016lx 0x%016lx = %d\n", __func__,
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cc_name(cc_op), src, dst, vr, r);
|
|
return r;
|
|
}
|
|
|
|
uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
|
|
uint64_t vr)
|
|
{
|
|
return do_calc_cc(env, cc_op, src, dst, vr);
|
|
}
|
|
|
|
uint32_t HELPER(calc_cc)(CPUS390XState *env, uint32_t cc_op, uint64_t src,
|
|
uint64_t dst, uint64_t vr)
|
|
{
|
|
return do_calc_cc(env, cc_op, src, dst, vr);
|
|
}
|
|
|
|
#ifndef CONFIG_USER_ONLY
|
|
void HELPER(load_psw)(CPUS390XState *env, uint64_t mask, uint64_t addr)
|
|
{
|
|
load_psw(env, mask, addr);
|
|
cpu_loop_exit(env_cpu(env));
|
|
}
|
|
|
|
void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
|
|
{
|
|
HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1);
|
|
|
|
switch (a1 & 0xf00) {
|
|
case 0x000:
|
|
env->psw.mask &= ~PSW_MASK_ASC;
|
|
env->psw.mask |= PSW_ASC_PRIMARY;
|
|
break;
|
|
case 0x100:
|
|
env->psw.mask &= ~PSW_MASK_ASC;
|
|
env->psw.mask |= PSW_ASC_SECONDARY;
|
|
break;
|
|
case 0x300:
|
|
env->psw.mask &= ~PSW_MASK_ASC;
|
|
env->psw.mask |= PSW_ASC_HOME;
|
|
break;
|
|
default:
|
|
HELPER_LOG("unknown sacf mode: %" PRIx64 "\n", a1);
|
|
s390_program_interrupt(env, PGM_SPECIFICATION, 2, GETPC());
|
|
break;
|
|
}
|
|
}
|
|
#endif
|