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qemu-e2k/target-ppc/op_helper.c
bellard 9fddaa0c0c PowerPC merge: real time TB and decrementer - faster and simpler exception handling (Jocelyn Mayer) 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@841 c046a42c-6fe2-441c-8c8c-71466251a162
2004-05-21 12:59:32 +00:00

432 lines
9.1 KiB
C
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/*
* PPC emulation helpers for qemu.
*
* Copyright (c) 2003 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_EXTERNAL:
case EXCP_DECR:
printf("DECREMENTER & EXTERNAL exceptions should be hard interrupts !\n");
if (msr_ee == 0)
return;
break;
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 */
/* Special registers load and store */
void do_load_cr (void)
{
T0 = (env->crf[0] << 28) |
(env->crf[1] << 24) |
(env->crf[2] << 20) |
(env->crf[3] << 16) |
(env->crf[4] << 12) |
(env->crf[5] << 8) |
(env->crf[6] << 4) |
(env->crf[7] << 0);
}
void do_store_cr (uint32_t mask)
{
int i, sh;
for (i = 0, sh = 7; i < 8; i++, sh --) {
if (mask & (1 << sh))
env->crf[i] = (T0 >> (sh * 4)) & 0xF;
}
}
void do_load_xer (void)
{
T0 = (xer_so << XER_SO) |
(xer_ov << XER_OV) |
(xer_ca << XER_CA) |
(xer_bc << XER_BC);
}
void do_store_xer (void)
{
xer_so = (T0 >> XER_SO) & 0x01;
xer_ov = (T0 >> XER_OV) & 0x01;
xer_ca = (T0 >> XER_CA) & 0x01;
xer_bc = (T0 >> XER_BC) & 0x1f;
}
void do_load_msr (void)
{
T0 = (msr_pow << MSR_POW) |
(msr_ile << MSR_ILE) |
(msr_ee << MSR_EE) |
(msr_pr << MSR_PR) |
(msr_fp << MSR_FP) |
(msr_me << MSR_ME) |
(msr_fe0 << MSR_FE0) |
(msr_se << MSR_SE) |
(msr_be << MSR_BE) |
(msr_fe1 << MSR_FE1) |
(msr_ip << MSR_IP) |
(msr_ir << MSR_IR) |
(msr_dr << MSR_DR) |
(msr_ri << MSR_RI) |
(msr_le << MSR_LE);
}
void do_store_msr (void)
{
if (((T0 >> MSR_IR) & 0x01) != msr_ir ||
((T0 >> MSR_DR) & 0x01) != msr_dr) {
/* Flush all tlb when changing translation mode or privilege level */
do_tlbia();
}
msr_pow = (T0 >> MSR_POW) & 0x03;
msr_ile = (T0 >> MSR_ILE) & 0x01;
msr_ee = (T0 >> MSR_EE) & 0x01;
msr_pr = (T0 >> MSR_PR) & 0x01;
msr_fp = (T0 >> MSR_FP) & 0x01;
msr_me = (T0 >> MSR_ME) & 0x01;
msr_fe0 = (T0 >> MSR_FE0) & 0x01;
msr_se = (T0 >> MSR_SE) & 0x01;
msr_be = (T0 >> MSR_BE) & 0x01;
msr_fe1 = (T0 >> MSR_FE1) & 0x01;
msr_ip = (T0 >> MSR_IP) & 0x01;
msr_ir = (T0 >> MSR_IR) & 0x01;
msr_dr = (T0 >> MSR_DR) & 0x01;
msr_ri = (T0 >> MSR_RI) & 0x01;
msr_le = (T0 >> MSR_LE) & 0x01;
}
/* shift right arithmetic helper */
void do_sraw (void)
{
int32_t ret;
xer_ca = 0;
if (T1 & 0x20) {
ret = (-1) * (T0 >> 31);
if (ret < 0)
xer_ca = 1;
} else {
ret = (int32_t)T0 >> (T1 & 0x1f);
if (ret < 0 && ((int32_t)T0 & ((1 << T1) - 1)) != 0)
xer_ca = 1;
}
(int32_t)T0 = ret;
}
/* Floating point operations helpers */
void do_load_fpscr (void)
{
/* The 32 MSB of the target fpr are undefined.
* They'll be zero...
*/
union {
double d;
struct {
uint32_t u[2];
} s;
} u;
int i;
u.s.u[0] = 0;
u.s.u[1] = 0;
for (i = 0; i < 8; i++)
u.s.u[1] |= env->fpscr[i] << (4 * i);
FT0 = u.d;
}
void do_store_fpscr (uint32_t mask)
{
/*
* We use only the 32 LSB of the incoming fpr
*/
union {
double d;
struct {
uint32_t u[2];
} s;
} u;
int i;
u.d = FT0;
if (mask & 0x80)
env->fpscr[0] = (env->fpscr[0] & 0x9) | ((u.s.u[1] >> 28) & ~0x9);
for (i = 1; i < 7; i++) {
if (mask & (1 << (7 - i)))
env->fpscr[i] = (u.s.u[1] >> (4 * (7 - i))) & 0xF;
}
/* TODO: update FEX & VX */
/* Set rounding mode */
switch (env->fpscr[0] & 0x3) {
case 0:
/* Best approximation (round to nearest) */
fesetround(FE_TONEAREST);
break;
case 1:
/* Smaller magnitude (round toward zero) */
fesetround(FE_TOWARDZERO);
break;
case 2:
/* Round toward +infinite */
fesetround(FE_UPWARD);
break;
case 3:
/* Round toward -infinite */
fesetround(FE_DOWNWARD);
break;
}
}
void do_fctiw (void)
{
union {
double d;
uint64_t i;
} *p = (void *)&FT1;
if (FT0 > (double)0x7FFFFFFF)
p->i = 0x7FFFFFFFULL << 32;
else if (FT0 < -(double)0x80000000)
p->i = 0x80000000ULL << 32;
else
p->i = 0;
p->i |= (uint32_t)FT0;
FT0 = p->d;
}
void do_fctiwz (void)
{
union {
double d;
uint64_t i;
} *p = (void *)&FT1;
int cround = fegetround();
fesetround(FE_TOWARDZERO);
if (FT0 > (double)0x7FFFFFFF)
p->i = 0x7FFFFFFFULL << 32;
else if (FT0 < -(double)0x80000000)
p->i = 0x80000000ULL << 32;
else
p->i = 0;
p->i |= (uint32_t)FT0;
FT0 = p->d;
fesetround(cround);
}
void do_fnmadds (void)
{
FTS0 = -((FTS0 * FTS1) + FTS2);
}
void do_fnmsubs (void)
{
FTS0 = -((FTS0 * FTS1) - FTS2);
}
void do_fsqrt (void)
{
FT0 = sqrt(FT0);
}
void do_fsqrts (void)
{
FT0 = (float)sqrt((float)FT0);
}
void do_fres (void)
{
FT0 = 1.0 / FT0;
}
void do_fsqrte (void)
{
FT0 = 1.0 / sqrt(FT0);
}
void do_fsel (void)
{
if (FT0 >= 0)
FT0 = FT2;
else
FT0 = FT1;
}
void do_fcmpu (void)
{
env->fpscr[4] &= ~0x1;
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)
{
FT0 = fabsl(FT0);
}
void do_fnabs (void)
{
FT0 = -fabsl(FT0);
}
/* Instruction cache invalidation helper */
#define ICACHE_LINE_SIZE 32
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);
}
/*****************************************************************************/
/* Special helpers for debug */
extern FILE *stdout;
void dump_state (void)
{
cpu_ppc_dump_state(env, stdout, 0);
}
void dump_rfi (void)
{
#if 0
printf("Return from interrupt %d => 0x%08x\n", pos, env->nip);
// cpu_ppc_dump_state(env, stdout, 0);
#endif
}
void dump_store_sr (int srnum)
{
#if 0
printf("%s: reg=%d 0x%08x\n", __func__, srnum, T0);
#endif
}
static void _dump_store_bat (char ID, int ul, int nr)
{
printf("Set %cBAT%d%c to 0x%08x (0x%08x)\n",
ID, nr, ul == 0 ? 'u' : 'l', T0, env->nip);
}
void dump_store_ibat (int ul, int nr)
{
_dump_store_bat('I', ul, nr);
}
void dump_store_dbat (int ul, int nr)
{
_dump_store_bat('D', ul, nr);
}
void dump_store_tb (int ul)
{
printf("Set TB%c to 0x%08x\n", ul == 0 ? 'L' : 'U', T0);
}
void dump_update_tb(uint32_t param)
{
#if 0
printf("Update TB: 0x%08x + %d => 0x%08x\n", T1, param, T0);
#endif
}
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