62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
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* OpenRISC int helper routines
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*
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* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
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* Feng Gao <gf91597@gmail.com>
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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 "exec/helper-proto.h"
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#include "exception.h"
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#include "qemu/host-utils.h"
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uint32_t HELPER(mul32)(CPUOpenRISCState *env,
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uint32_t ra, uint32_t rb)
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{
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uint64_t result;
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uint32_t high, cy;
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OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
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result = (uint64_t)ra * rb;
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/* regisiers in or32 is 32bit, so 32 is NOT a magic number.
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or64 is not handled in this function, and not implement yet,
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TARGET_LONG_BITS for or64 is 64, it will break this function,
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so, we didn't use TARGET_LONG_BITS here. */
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high = result >> 32;
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cy = result >> (32 - 1);
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if ((cy & 0x1) == 0x0) {
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if (high == 0x0) {
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return result;
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}
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}
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if ((cy & 0x1) == 0x1) {
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if (high == 0xffffffff) {
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return result;
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}
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}
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cpu->env.sr |= (SR_OV | SR_CY);
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if (cpu->env.sr & SR_OVE) {
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raise_exception(cpu, EXCP_RANGE);
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}
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return result;
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}
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