qemu/target-ppc/op_helper.c
bellard 2be0071f22 simplified PowerPC exception handling (Jocelyn Mayer)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1492 c046a42c-6fe2-441c-8c8c-71466251a162
2005-07-02 22:09:27 +00:00

296 lines
6.2 KiB
C

/*
* PowerPC emulation helpers for qemu.
*
* Copyright (c) 2003-2005 Jocelyn Mayer
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include "exec.h"
#define MEMSUFFIX _raw
#include "op_helper_mem.h"
#if !defined(CONFIG_USER_ONLY)
#define MEMSUFFIX _user
#include "op_helper_mem.h"
#define MEMSUFFIX _kernel
#include "op_helper_mem.h"
#endif
/*****************************************************************************/
/* Exceptions processing helpers */
void cpu_loop_exit(void)
{
longjmp(env->jmp_env, 1);
}
void do_raise_exception_err (uint32_t exception, int error_code)
{
#if 0
printf("Raise exception %3x code : %d\n", exception, error_code);
#endif
switch (exception) {
case EXCP_PROGRAM:
if (error_code == EXCP_FP && msr_fe0 == 0 && msr_fe1 == 0)
return;
break;
default:
break;
}
env->exception_index = exception;
env->error_code = error_code;
cpu_loop_exit();
}
void do_raise_exception (uint32_t exception)
{
do_raise_exception_err(exception, 0);
}
/*****************************************************************************/
/* Helpers for "fat" micro operations */
/* shift right arithmetic helper */
void do_sraw (void)
{
int32_t ret;
xer_ca = 0;
if (T1 & 0x20) {
ret = (-1) * (T0 >> 31);
if (ret < 0 && (T0 & ~0x80000000) != 0)
xer_ca = 1;
#if 1 // TRY
} else if (T1 == 0) {
ret = T0;
#endif
} else {
ret = (int32_t)T0 >> (T1 & 0x1f);
if (ret < 0 && ((int32_t)T0 & ((1 << T1) - 1)) != 0)
xer_ca = 1;
}
T0 = ret;
}
/* Floating point operations helpers */
void do_fctiw (void)
{
union {
double d;
uint64_t i;
} p;
/* XXX: higher bits are not supposed to be significant.
* to make tests easier, return the same as a real PowerPC 750 (aka G3)
*/
p.i = float64_to_int32(FT0, &env->fp_status);
p.i |= 0xFFF80000ULL << 32;
FT0 = p.d;
}
void do_fctiwz (void)
{
union {
double d;
uint64_t i;
} p;
/* XXX: higher bits are not supposed to be significant.
* to make tests easier, return the same as a real PowerPC 750 (aka G3)
*/
p.i = float64_to_int32_round_to_zero(FT0, &env->fp_status);
p.i |= 0xFFF80000ULL << 32;
FT0 = p.d;
}
void do_fnmadd (void)
{
FT0 = (FT0 * FT1) + FT2;
if (!isnan(FT0))
FT0 = -FT0;
}
void do_fnmsub (void)
{
FT0 = (FT0 * FT1) - FT2;
if (!isnan(FT0))
FT0 = -FT0;
}
void do_fdiv (void)
{
if (FT0 == -0.0 && FT1 == -0.0)
FT0 = 0.0 / 0.0;
else
FT0 /= FT1;
}
void do_fsqrt (void)
{
FT0 = sqrt(FT0);
}
void do_fres (void)
{
union {
double d;
uint64_t i;
} p;
if (isnormal(FT0)) {
FT0 = (float)(1.0 / FT0);
} else {
p.d = FT0;
if (p.i == 0x8000000000000000ULL) {
p.i = 0xFFF0000000000000ULL;
} else if (p.i == 0x0000000000000000ULL) {
p.i = 0x7FF0000000000000ULL;
} else if (isnan(FT0)) {
p.i = 0x7FF8000000000000ULL;
} else if (FT0 < 0.0) {
p.i = 0x8000000000000000ULL;
} else {
p.i = 0x0000000000000000ULL;
}
FT0 = p.d;
}
}
void do_frsqrte (void)
{
union {
double d;
uint64_t i;
} p;
if (isnormal(FT0) && FT0 > 0.0) {
FT0 = (float)(1.0 / sqrt(FT0));
} else {
p.d = FT0;
if (p.i == 0x8000000000000000ULL) {
p.i = 0xFFF0000000000000ULL;
} else if (p.i == 0x0000000000000000ULL) {
p.i = 0x7FF0000000000000ULL;
} else if (isnan(FT0)) {
if (!(p.i & 0x0008000000000000ULL))
p.i |= 0x000FFFFFFFFFFFFFULL;
} else if (FT0 < 0) {
p.i = 0x7FF8000000000000ULL;
} else {
p.i = 0x0000000000000000ULL;
}
FT0 = p.d;
}
}
void do_fsel (void)
{
if (FT0 >= 0)
FT0 = FT1;
else
FT0 = FT2;
}
void do_fcmpu (void)
{
if (isnan(FT0) || isnan(FT1)) {
T0 = 0x01;
env->fpscr[4] |= 0x1;
env->fpscr[6] |= 0x1;
} else if (FT0 < FT1) {
T0 = 0x08;
} else if (FT0 > FT1) {
T0 = 0x04;
} else {
T0 = 0x02;
}
env->fpscr[3] = T0;
}
void do_fcmpo (void)
{
env->fpscr[4] &= ~0x1;
if (isnan(FT0) || isnan(FT1)) {
T0 = 0x01;
env->fpscr[4] |= 0x1;
/* I don't know how to test "quiet" nan... */
if (0 /* || ! quiet_nan(...) */) {
env->fpscr[6] |= 0x1;
if (!(env->fpscr[1] & 0x8))
env->fpscr[4] |= 0x8;
} else {
env->fpscr[4] |= 0x8;
}
} else if (FT0 < FT1) {
T0 = 0x08;
} else if (FT0 > FT1) {
T0 = 0x04;
} else {
T0 = 0x02;
}
env->fpscr[3] = T0;
}
void do_fabs (void)
{
union {
double d;
uint64_t i;
} p;
p.d = FT0;
p.i &= ~0x8000000000000000ULL;
FT0 = p.d;
}
void do_fnabs (void)
{
union {
double d;
uint64_t i;
} p;
p.d = FT0;
p.i |= 0x8000000000000000ULL;
FT0 = p.d;
}
/* Instruction cache invalidation helper */
#define ICACHE_LINE_SIZE 32
void do_check_reservation (void)
{
if ((env->reserve & ~0x03) == T0)
env->reserve = -1;
}
void do_icbi (void)
{
/* Invalidate one cache line */
T0 &= ~(ICACHE_LINE_SIZE - 1);
tb_invalidate_page_range(T0, T0 + ICACHE_LINE_SIZE);
}
/* TLB invalidation helpers */
void do_tlbia (void)
{
tlb_flush(env, 1);
}
void do_tlbie (void)
{
tlb_flush_page(env, T0);
}