mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
334 lines
8.6 KiB
C
334 lines
8.6 KiB
C
/*
|
|
* i386 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)
|
|
#define SIGN_MASK (((target_ulong)1) << (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_TYPE uint8_t
|
|
#define DATA_STYPE int8_t
|
|
#define DATA_MASK 0xff
|
|
#elif DATA_BITS == 16
|
|
#define SUFFIX w
|
|
#define DATA_TYPE uint16_t
|
|
#define DATA_STYPE int16_t
|
|
#define DATA_MASK 0xffff
|
|
#elif DATA_BITS == 32
|
|
#define SUFFIX l
|
|
#define DATA_TYPE uint32_t
|
|
#define DATA_STYPE int32_t
|
|
#define DATA_MASK 0xffffffff
|
|
#elif DATA_BITS == 64
|
|
#define SUFFIX q
|
|
#define DATA_TYPE uint64_t
|
|
#define DATA_STYPE int64_t
|
|
#define DATA_MASK 0xffffffffffffffffULL
|
|
#else
|
|
#error unhandled operand size
|
|
#endif
|
|
|
|
/* dynamic flags computation */
|
|
|
|
static int glue(compute_all_add, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
target_long src1, src2;
|
|
src1 = CC_SRC;
|
|
src2 = CC_DST - CC_SRC;
|
|
cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = (CC_DST ^ src1 ^ src2) & 0x10;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_c_add, SUFFIX)(void)
|
|
{
|
|
int cf;
|
|
target_long src1;
|
|
src1 = CC_SRC;
|
|
cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
|
|
return cf;
|
|
}
|
|
|
|
static int glue(compute_all_adc, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
target_long src1, src2;
|
|
src1 = CC_SRC;
|
|
src2 = CC_DST - CC_SRC - 1;
|
|
cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = (CC_DST ^ src1 ^ src2) & 0x10;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_c_adc, SUFFIX)(void)
|
|
{
|
|
int cf;
|
|
target_long src1;
|
|
src1 = CC_SRC;
|
|
cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1;
|
|
return cf;
|
|
}
|
|
|
|
static int glue(compute_all_sub, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
target_long src1, src2;
|
|
src1 = CC_DST + CC_SRC;
|
|
src2 = CC_SRC;
|
|
cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = (CC_DST ^ src1 ^ src2) & 0x10;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_c_sub, SUFFIX)(void)
|
|
{
|
|
int cf;
|
|
target_long src1, src2;
|
|
src1 = CC_DST + CC_SRC;
|
|
src2 = CC_SRC;
|
|
cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
|
|
return cf;
|
|
}
|
|
|
|
static int glue(compute_all_sbb, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
target_long src1, src2;
|
|
src1 = CC_DST + CC_SRC + 1;
|
|
src2 = CC_SRC;
|
|
cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = (CC_DST ^ src1 ^ src2) & 0x10;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_c_sbb, SUFFIX)(void)
|
|
{
|
|
int cf;
|
|
target_long src1, src2;
|
|
src1 = CC_DST + CC_SRC + 1;
|
|
src2 = CC_SRC;
|
|
cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2;
|
|
return cf;
|
|
}
|
|
|
|
static int glue(compute_all_logic, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
cf = 0;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = 0;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = 0;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_c_logic, SUFFIX)(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int glue(compute_all_inc, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
target_long src1, src2;
|
|
src1 = CC_DST - 1;
|
|
src2 = 1;
|
|
cf = CC_SRC;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = (CC_DST ^ src1 ^ src2) & 0x10;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
#if DATA_BITS == 32
|
|
static int glue(compute_c_inc, SUFFIX)(void)
|
|
{
|
|
return CC_SRC;
|
|
}
|
|
#endif
|
|
|
|
static int glue(compute_all_dec, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
target_long src1, src2;
|
|
src1 = CC_DST + 1;
|
|
src2 = 1;
|
|
cf = CC_SRC;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = (CC_DST ^ src1 ^ src2) & 0x10;
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_all_shl, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = 0; /* undefined */
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
/* of is defined if shift count == 1 */
|
|
of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
static int glue(compute_c_shl, SUFFIX)(void)
|
|
{
|
|
return (CC_SRC >> (DATA_BITS - 1)) & CC_C;
|
|
}
|
|
|
|
#if DATA_BITS == 32
|
|
static int glue(compute_c_sar, SUFFIX)(void)
|
|
{
|
|
return CC_SRC & 1;
|
|
}
|
|
#endif
|
|
|
|
static int glue(compute_all_sar, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
cf = CC_SRC & 1;
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = 0; /* undefined */
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
/* of is defined if shift count == 1 */
|
|
of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
#if DATA_BITS == 32
|
|
static int glue(compute_c_mul, SUFFIX)(void)
|
|
{
|
|
int cf;
|
|
cf = (CC_SRC != 0);
|
|
return cf;
|
|
}
|
|
#endif
|
|
|
|
/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
|
|
CF are modified and it is slower to do that. */
|
|
static int glue(compute_all_mul, SUFFIX)(void)
|
|
{
|
|
int cf, pf, af, zf, sf, of;
|
|
cf = (CC_SRC != 0);
|
|
pf = parity_table[(uint8_t)CC_DST];
|
|
af = 0; /* undefined */
|
|
zf = ((DATA_TYPE)CC_DST == 0) << 6;
|
|
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
|
|
of = cf << 11;
|
|
return cf | pf | af | zf | sf | of;
|
|
}
|
|
|
|
/* shifts */
|
|
|
|
target_ulong glue(helper_rcl, SUFFIX)(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 = helper_cc_compute_all(CC_OP);
|
|
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_tmp = (eflags & ~(CC_C | CC_O)) |
|
|
(lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
|
|
((src >> (DATA_BITS - count)) & CC_C);
|
|
} else {
|
|
env->cc_tmp = -1;
|
|
}
|
|
return t0;
|
|
}
|
|
|
|
target_ulong glue(helper_rcr, SUFFIX)(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 = helper_cc_compute_all(CC_OP);
|
|
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_tmp = (eflags & ~(CC_C | CC_O)) |
|
|
(lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
|
|
((src >> (count - 1)) & CC_C);
|
|
} else {
|
|
env->cc_tmp = -1;
|
|
}
|
|
return t0;
|
|
}
|
|
|
|
#undef DATA_BITS
|
|
#undef SHIFT_MASK
|
|
#undef SHIFT1_MASK
|
|
#undef SIGN_MASK
|
|
#undef DATA_TYPE
|
|
#undef DATA_STYPE
|
|
#undef DATA_MASK
|
|
#undef SUFFIX
|