mirror of https://gitee.com/openkylin/qemu.git
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
|
/*
|
||
|
|
* OpenRISC int helper routines
|
||
|
|
*
|
||
|
|
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
|
||
|
|
* Feng Gao <gf91597@gmail.com>
|
||
|
|
*
|
||
|
|
* 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 "helper.h"
|
||
|
|
#include "exception.h"
|
||
|
|
#include "host-utils.h"
|
||
|
|
|
||
|
|
target_ulong HELPER(ff1)(target_ulong x)
|
||
|
|
{
|
||
|
|
/*#ifdef TARGET_OPENRISC64
|
||
|
|
return x ? ctz64(x) + 1 : 0;
|
||
|
|
#else*/
|
||
|
|
return x ? ctz32(x) + 1 : 0;
|
||
|
|
/*#endif*/
|
||
|
|
}
|
||
|
|
|
||
|
|
target_ulong HELPER(fl1)(target_ulong x)
|
||
|
|
{
|
||
|
|
/* not used yet, open it when we need or64. */
|
||
|
|
/*#ifdef TARGET_OPENRISC64
|
||
|
|
return 64 - clz64(x);
|
||
|
|
#else*/
|
||
|
|
return 32 - clz32(x);
|
||
|
|
/*#endif*/
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t HELPER(mul32)(CPUOpenRISCState *env,
|
||
|
|
uint32_t ra, uint32_t rb)
|
||
|
|
{
|
||
|
|
uint64_t result;
|
||
|
|
uint32_t high, cy;
|
||
|
|
|
||
|
|
OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
|
||
|
|
|
||
|
|
result = (uint64_t)ra * rb;
|
||
|
|
/* regisiers in or32 is 32bit, so 32 is NOT a magic number.
|
||
|
|
or64 is not handled in this function, and not implement yet,
|
||
|
|
TARGET_LONG_BITS for or64 is 64, it will break this function,
|
||
|
|
so, we didn't use TARGET_LONG_BITS here. */
|
||
|
|
high = result >> 32;
|
||
|
|
cy = result >> (32 - 1);
|
||
|
|
|
||
|
|
if ((cy & 0x1) == 0x0) {
|
||
|
|
if (high == 0x0) {
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((cy & 0x1) == 0x1) {
|
||
|
|
if (high == 0xffffffff) {
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cpu->env.sr |= (SR_OV | SR_CY);
|
||
|
|
if (cpu->env.sr & SR_OVE) {
|
||
|
|
raise_exception(cpu, EXCP_RANGE);
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|