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/*
* S/390 integer helper routines
*
* Copyright (c) 2009 Ulrich Hecht
* Copyright (c) 2009 Alexander Graf
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "internal.h"
#include "exec/exec-all.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
/* #define DEBUG_HELPER */
#ifdef DEBUG_HELPER
#define HELPER_LOG(x...) qemu_log(x)
#else
#define HELPER_LOG(x...)
#endif
/* 64/32 -> 32 signed division */
int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
{
int32_t ret, b = b64;
int64_t q;
if (b == 0) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
ret = q = a / b;
env->retxl = a % b;
/* Catch non-representable quotient. */
if (ret != q) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
return ret;
}
/* 64/32 -> 32 unsigned division */
uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
{
uint32_t ret, b = b64;
uint64_t q;
if (b == 0) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
ret = q = a / b;
env->retxl = a % b;
/* Catch non-representable quotient. */
if (ret != q) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
return ret;
}
/* 64/64 -> 64 signed division */
int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
{
/* Catch divide by zero, and non-representable quotient (MIN / -1). */
if (b == 0 || (b == -1 && a == (1ll << 63))) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
env->retxl = a % b;
return a / b;
}
/* 128 -> 64/64 unsigned division */
uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
uint64_t b)
{
uint64_t ret;
/* Signal divide by zero. */
if (b == 0) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
if (ah == 0) {
/* 64 -> 64/64 case */
env->retxl = al % b;
ret = al / b;
} else {
/* ??? Move i386 idivq helper to host-utils. */
#ifdef CONFIG_INT128
__uint128_t a = ((__uint128_t)ah << 64) | al;
__uint128_t q = a / b;
env->retxl = a % b;
ret = q;
if (ret != q) {
s390_program_interrupt(env, PGM_FIXPT_DIVIDE, ILEN_AUTO, GETPC());
}
#else
S390CPU *cpu = s390_env_get_cpu(env);
/* 32-bit hosts would need special wrapper functionality - just abort if
we encounter such a case; it's very unlikely anyways. */
cpu_abort(CPU(cpu), "128 -> 64/64 division not implemented\n");
#endif
}
return ret;
}
uint64_t HELPER(cvd)(int32_t reg)
{
/* positive 0 */
uint64_t dec = 0x0c;
int64_t bin = reg;
int shift;
if (bin < 0) {
bin = -bin;
dec = 0x0d;
}
for (shift = 4; (shift < 64) && bin; shift += 4) {
dec |= (bin % 10) << shift;
bin /= 10;
}
return dec;
}
uint64_t HELPER(popcnt)(uint64_t val)
{
/* Note that we don't fold past bytes. */
val = (val & 0x5555555555555555ULL) + ((val >> 1) & 0x5555555555555555ULL);
val = (val & 0x3333333333333333ULL) + ((val >> 2) & 0x3333333333333333ULL);
val = (val + (val >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
return val;
}
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