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/*
* RISC-V Emulation Helpers for QEMU.
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
* Copyright (c) 2017-2018 SiFive, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
target_ulong HELPER(divu_i128)(CPURISCVState *env,
target_ulong ul, target_ulong uh,
target_ulong vl, target_ulong vh)
{
target_ulong ql, qh;
Int128 q;
if (vl == 0 && vh == 0) { /* Handle special behavior on div by zero */
ql = ~0x0;
qh = ~0x0;
} else {
q = int128_divu(int128_make128(ul, uh), int128_make128(vl, vh));
ql = int128_getlo(q);
qh = int128_gethi(q);
}
env->retxh = qh;
return ql;
}
target_ulong HELPER(remu_i128)(CPURISCVState *env,
target_ulong ul, target_ulong uh,
target_ulong vl, target_ulong vh)
{
target_ulong rl, rh;
Int128 r;
if (vl == 0 && vh == 0) {
rl = ul;
rh = uh;
} else {
r = int128_remu(int128_make128(ul, uh), int128_make128(vl, vh));
rl = int128_getlo(r);
rh = int128_gethi(r);
}
env->retxh = rh;
return rl;
}
target_ulong HELPER(divs_i128)(CPURISCVState *env,
target_ulong ul, target_ulong uh,
target_ulong vl, target_ulong vh)
{
target_ulong qh, ql;
Int128 q;
if (vl == 0 && vh == 0) { /* Div by zero check */
ql = ~0x0;
qh = ~0x0;
} else if (uh == (1ULL << (TARGET_LONG_BITS - 1)) && ul == 0 &&
vh == ~0x0 && vl == ~0x0) {
/* Signed div overflow check (-2**127 / -1) */
ql = ul;
qh = uh;
} else {
q = int128_divs(int128_make128(ul, uh), int128_make128(vl, vh));
ql = int128_getlo(q);
qh = int128_gethi(q);
}
env->retxh = qh;
return ql;
}
target_ulong HELPER(rems_i128)(CPURISCVState *env,
target_ulong ul, target_ulong uh,
target_ulong vl, target_ulong vh)
{
target_ulong rh, rl;
Int128 r;
if (vl == 0 && vh == 0) {
rl = ul;
rh = uh;
} else {
r = int128_rems(int128_make128(ul, uh), int128_make128(vl, vh));
rl = int128_getlo(r);
rh = int128_gethi(r);
}
env->retxh = rh;
return rl;
}
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