80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
|
|
* AArch64 specific helpers
|
|
*
|
|
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
|
|
*
|
|
* 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 "exec/gdbstub.h"
|
|
#include "helper.h"
|
|
#include "qemu/host-utils.h"
|
|
#include "sysemu/sysemu.h"
|
|
#include "qemu/bitops.h"
|
|
|
|
/* C2.4.7 Multiply and divide */
|
|
/* special cases for 0 and LLONG_MIN are mandated by the standard */
|
|
uint64_t HELPER(udiv64)(uint64_t num, uint64_t den)
|
|
{
|
|
if (den == 0) {
|
|
return 0;
|
|
}
|
|
return num / den;
|
|
}
|
|
|
|
int64_t HELPER(sdiv64)(int64_t num, int64_t den)
|
|
{
|
|
if (den == 0) {
|
|
return 0;
|
|
}
|
|
if (num == LLONG_MIN && den == -1) {
|
|
return LLONG_MIN;
|
|
}
|
|
return num / den;
|
|
}
|
|
|
|
uint64_t HELPER(clz64)(uint64_t x)
|
|
{
|
|
return clz64(x);
|
|
}
|
|
|
|
uint64_t HELPER(cls64)(uint64_t x)
|
|
{
|
|
return clrsb64(x);
|
|
}
|
|
|
|
uint32_t HELPER(cls32)(uint32_t x)
|
|
{
|
|
return clrsb32(x);
|
|
}
|
|
|
|
uint64_t HELPER(rbit64)(uint64_t x)
|
|
{
|
|
/* assign the correct byte position */
|
|
x = bswap64(x);
|
|
|
|
/* assign the correct nibble position */
|
|
x = ((x & 0xf0f0f0f0f0f0f0f0ULL) >> 4)
|
|
| ((x & 0x0f0f0f0f0f0f0f0fULL) << 4);
|
|
|
|
/* assign the correct bit position */
|
|
x = ((x & 0x8888888888888888ULL) >> 3)
|
|
| ((x & 0x4444444444444444ULL) >> 1)
|
|
| ((x & 0x2222222222222222ULL) << 1)
|
|
| ((x & 0x1111111111111111ULL) << 3);
|
|
|
|
return x;
|
|
}
|