mirror of https://gitee.com/openkylin/qemu.git
149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
/*
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* S/390 integer 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 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 "qemu/host-utils.h"
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#include "exec/helper-proto.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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/* 64/32 -> 32 signed division */
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int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
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{
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int32_t ret, b = b64;
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int64_t q;
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if (b == 0) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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ret = q = a / b;
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env->retxl = a % b;
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/* Catch non-representable quotient. */
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if (ret != q) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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return ret;
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}
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/* 64/32 -> 32 unsigned division */
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uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
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{
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uint32_t ret, b = b64;
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uint64_t q;
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if (b == 0) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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ret = q = a / b;
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env->retxl = a % b;
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/* Catch non-representable quotient. */
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if (ret != q) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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return ret;
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}
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/* 64/64 -> 64 signed division */
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int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
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{
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/* Catch divide by zero, and non-representable quotient (MIN / -1). */
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if (b == 0 || (b == -1 && a == (1ll << 63))) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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env->retxl = a % b;
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return a / b;
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}
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/* 128 -> 64/64 unsigned division */
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uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
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uint64_t b)
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{
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uint64_t ret;
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/* Signal divide by zero. */
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if (b == 0) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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if (ah == 0) {
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/* 64 -> 64/64 case */
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env->retxl = al % b;
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ret = al / b;
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} else {
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/* ??? Move i386 idivq helper to host-utils. */
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#ifdef CONFIG_INT128
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__uint128_t a = ((__uint128_t)ah << 64) | al;
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__uint128_t q = a / b;
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env->retxl = a % b;
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ret = q;
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if (ret != q) {
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runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
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}
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#else
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S390CPU *cpu = s390_env_get_cpu(env);
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/* 32-bit hosts would need special wrapper functionality - just abort if
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we encounter such a case; it's very unlikely anyways. */
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cpu_abort(CPU(cpu), "128 -> 64/64 division not implemented\n");
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#endif
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}
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return ret;
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}
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uint64_t HELPER(cvd)(int32_t reg)
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{
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/* positive 0 */
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uint64_t dec = 0x0c;
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int64_t bin = reg;
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int shift;
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if (bin < 0) {
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bin = -bin;
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dec = 0x0d;
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}
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for (shift = 4; (shift < 64) && bin; shift += 4) {
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dec |= (bin % 10) << shift;
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bin /= 10;
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}
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return dec;
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}
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uint64_t HELPER(popcnt)(uint64_t val)
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{
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/* Note that we don't fold past bytes. */
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val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
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val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
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val = (val + (val >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
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return val;
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}
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