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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 "cpu.h"
#include "qemu/host-utils.h"
#include "helper.h"
/* #define DEBUG_HELPER */
#ifdef DEBUG_HELPER
#define HELPER_LOG(x...) qemu_log(x)
#else
#define HELPER_LOG(x...)
#endif
/* 64/64 -> 128 unsigned multiplication */
uint64_t HELPER(mul128)(CPUS390XState *env, uint64_t v1, uint64_t v2)
{
uint64_t reth;
mulu64(&env->retxl, &reth, v1, v2);
return reth;
}
/* 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) {
runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
}
ret = q = a / b;
env->retxl = a % b;
/* Catch non-representable quotient. */
if (ret != q) {
runtime_exception(env, PGM_FIXPT_DIVIDE, 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) {
runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
}
ret = q = a / b;
env->retxl = a % b;
/* Catch non-representable quotient. */
if (ret != q) {
runtime_exception(env, PGM_FIXPT_DIVIDE, 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))) {
runtime_exception(env, PGM_FIXPT_DIVIDE, 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) {
runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
}
if (ah == 0) {
/* 64 -> 64/64 case */
env->retxl = al % b;
ret = al / b;
} else {
/* ??? Move i386 idivq helper to host-utils. */
#if HOST_LONG_BITS == 64 && defined(__GNUC__)
/* assuming 64-bit hosts have __uint128_t */
__uint128_t a = ((__uint128_t)ah << 64) | al;
__uint128_t q = a / b;
env->retxl = a % b;
ret = q;
if (ret != q) {
runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
}
#else
/* 32-bit hosts would need special wrapper functionality - just abort if
we encounter such a case; it's very unlikely anyways. */
cpu_abort(env, "128 -> 64/64 division not implemented\n");
#endif
}
return ret;
}
/* absolute value 32-bit */
uint32_t HELPER(abs_i32)(int32_t val)
{
if (val < 0) {
return -val;
} else {
return val;
}
}
/* negative absolute value 32-bit */
int32_t HELPER(nabs_i32)(int32_t val)
{
if (val < 0) {
return val;
} else {
return -val;
}
}
/* absolute value 64-bit */
uint64_t HELPER(abs_i64)(int64_t val)
{
HELPER_LOG("%s: val 0x%" PRIx64 "\n", __func__, val);
if (val < 0) {
return -val;
} else {
return val;
}
}
/* negative absolute value 64-bit */
int64_t HELPER(nabs_i64)(int64_t val)
{
if (val < 0) {
return val;
} else {
return -val;
}
}
/* find leftmost one */
uint32_t HELPER(flogr)(CPUS390XState *env, uint32_t r1, uint64_t v2)
{
uint64_t res = 0;
uint64_t ov2 = v2;
while (!(v2 & 0x8000000000000000ULL) && v2) {
v2 <<= 1;
res++;
}
if (!v2) {
env->regs[r1] = 64;
env->regs[r1 + 1] = 0;
return 0;
} else {
env->regs[r1] = res;
env->regs[r1 + 1] = ov2 & ~(0x8000000000000000ULL >> res);
return 2;
}
}
uint64_t HELPER(cvd)(int32_t bin)
{
/* positive 0 */
uint64_t dec = 0x0c;
int shift = 4;
if (bin < 0) {
bin = -bin;
dec = 0x0d;
}
for (shift = 4; (shift < 64) && bin; shift += 4) {
int current_number = bin % 10;
dec |= (current_number) << shift;
bin /= 10;
}
return dec;
}
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