mirror of
https://github.com/yuzu-emu/unicorn.git
synced 2025-10-27 22:08:19 +00:00
109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*
|
|
* x86 shift helpers
|
|
*
|
|
* Copyright (c) 2008 Fabrice Bellard
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#define DATA_BITS (1 << (3 + SHIFT))
|
|
#define SHIFT_MASK (DATA_BITS - 1)
|
|
#if DATA_BITS <= 32
|
|
#define SHIFT1_MASK 0x1f
|
|
#else
|
|
#define SHIFT1_MASK 0x3f
|
|
#endif
|
|
|
|
#if DATA_BITS == 8
|
|
#define SUFFIX b
|
|
#define DATA_MASK 0xff
|
|
#elif DATA_BITS == 16
|
|
#define SUFFIX w
|
|
#define DATA_MASK 0xffff
|
|
#elif DATA_BITS == 32
|
|
#define SUFFIX l
|
|
#define DATA_MASK 0xffffffff
|
|
#elif DATA_BITS == 64
|
|
#define SUFFIX q
|
|
#define DATA_MASK 0xffffffffffffffffULL
|
|
#else
|
|
#error unhandled operand size
|
|
#endif
|
|
|
|
target_ulong glue(helper_rcl, SUFFIX)(CPUX86State *env, target_ulong t0,
|
|
target_ulong t1)
|
|
{
|
|
int count, eflags;
|
|
target_ulong src;
|
|
target_long res;
|
|
|
|
count = t1 & SHIFT1_MASK;
|
|
#if DATA_BITS == 16
|
|
count = rclw_table[count];
|
|
#elif DATA_BITS == 8
|
|
count = rclb_table[count];
|
|
#endif
|
|
if (count) {
|
|
eflags = (int)env->cc_src;
|
|
t0 &= DATA_MASK;
|
|
src = t0;
|
|
res = (t0 << count) | ((target_ulong)(eflags & CC_C) << (count - 1));
|
|
if (count > 1) {
|
|
res |= t0 >> (DATA_BITS + 1 - count);
|
|
}
|
|
t0 = res;
|
|
env->cc_src = (eflags & ~(CC_C | CC_O)) |
|
|
(lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
|
|
((src >> (DATA_BITS - count)) & CC_C);
|
|
}
|
|
return t0;
|
|
}
|
|
|
|
target_ulong glue(helper_rcr, SUFFIX)(CPUX86State *env, target_ulong t0,
|
|
target_ulong t1)
|
|
{
|
|
int count, eflags;
|
|
target_ulong src;
|
|
target_long res;
|
|
|
|
count = t1 & SHIFT1_MASK;
|
|
#if DATA_BITS == 16
|
|
count = rclw_table[count];
|
|
#elif DATA_BITS == 8
|
|
count = rclb_table[count];
|
|
#endif
|
|
if (count) {
|
|
eflags = (int)env->cc_src;
|
|
t0 &= DATA_MASK;
|
|
src = t0;
|
|
res = (t0 >> count) |
|
|
((target_ulong)(eflags & CC_C) << (DATA_BITS - count));
|
|
if (count > 1) {
|
|
res |= t0 << (DATA_BITS + 1 - count);
|
|
}
|
|
t0 = res;
|
|
env->cc_src = (eflags & ~(CC_C | CC_O)) |
|
|
(lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
|
|
((src >> (count - 1)) & CC_C);
|
|
}
|
|
return t0;
|
|
}
|
|
|
|
#undef DATA_BITS
|
|
#undef SHIFT_MASK
|
|
#undef SHIFT1_MASK
|
|
#undef DATA_TYPE
|
|
#undef DATA_MASK
|
|
#undef SUFFIX
|