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qemu-e2k/target-alpha/helper.c
Stefan Weil 212df02975 target-alpha: Fix compiler warning for gcc-4.3 (and older) 
"Old" compilers obviously are not able to recognise
that all cases are handled here:

qemu/target-alpha/helper.c:70: error: ‘round_mode’ may be used uninitialized in this function

A small modification helps the compiler to do its jobs.

gcc-4.4 does not need this, but is still not standard on all platforms.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Acked-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2009-12-16 18:26:28 +01:00

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/*
* Alpha emulation cpu helpers for qemu.
*
* Copyright (c) 2007 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include "cpu.h"
#include "exec-all.h"
#include "softfloat.h"
uint64_t cpu_alpha_load_fpcr (CPUState *env)
{
uint64_t ret = 0;
int flags, mask;
flags = env->fp_status.float_exception_flags;
ret |= (uint64_t) flags << 52;
if (flags)
ret |= FPCR_SUM;
env->ipr[IPR_EXC_SUM] &= ~0x3E;
env->ipr[IPR_EXC_SUM] |= flags << 1;
mask = env->fp_status.float_exception_mask;
if (mask & float_flag_invalid)
ret |= FPCR_INVD;
if (mask & float_flag_divbyzero)
ret |= FPCR_DZED;
if (mask & float_flag_overflow)
ret |= FPCR_OVFD;
if (mask & float_flag_underflow)
ret |= FPCR_UNFD;
if (mask & float_flag_inexact)
ret |= FPCR_INED;
switch (env->fp_status.float_rounding_mode) {
case float_round_nearest_even:
ret |= 2ULL << FPCR_DYN_SHIFT;
break;
case float_round_down:
ret |= 1ULL << FPCR_DYN_SHIFT;
break;
case float_round_up:
ret |= 3ULL << FPCR_DYN_SHIFT;
break;
case float_round_to_zero:
break;
}
return ret;
}
void cpu_alpha_store_fpcr (CPUState *env, uint64_t val)
{
int round_mode, mask;
set_float_exception_flags((val >> 52) & 0x3F, &env->fp_status);
mask = 0;
if (val & FPCR_INVD)
mask |= float_flag_invalid;
if (val & FPCR_DZED)
mask |= float_flag_divbyzero;
if (val & FPCR_OVFD)
mask |= float_flag_overflow;
if (val & FPCR_UNFD)
mask |= float_flag_underflow;
if (val & FPCR_INED)
mask |= float_flag_inexact;
env->fp_status.float_exception_mask = mask;
switch ((val >> FPCR_DYN_SHIFT) & 3) {
case 0:
round_mode = float_round_to_zero;
break;
case 1:
round_mode = float_round_down;
break;
case 2:
round_mode = float_round_nearest_even;
break;
case 3:
default: /* this avoids a gcc (< 4.4) warning */
round_mode = float_round_up;
break;
}
set_float_rounding_mode(round_mode, &env->fp_status);
}
#if defined(CONFIG_USER_ONLY)
int cpu_alpha_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int mmu_idx, int is_softmmu)
{
if (rw == 2)
env->exception_index = EXCP_ITB_MISS;
else
env->exception_index = EXCP_DFAULT;
env->ipr[IPR_EXC_ADDR] = address;
return 1;
}
target_phys_addr_t cpu_get_phys_page_debug (CPUState *env, target_ulong addr)
{
return addr;
}
void do_interrupt (CPUState *env)
{
env->exception_index = -1;
}
#else
target_phys_addr_t cpu_get_phys_page_debug (CPUState *env, target_ulong addr)
{
return -1;
}
int cpu_alpha_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int mmu_idx, int is_softmmu)
{
uint32_t opc;
if (rw == 2) {
/* Instruction translation buffer miss */
env->exception_index = EXCP_ITB_MISS;
} else {
if (env->ipr[IPR_EXC_ADDR] & 1)
env->exception_index = EXCP_DTB_MISS_PAL;
else
env->exception_index = EXCP_DTB_MISS_NATIVE;
opc = (ldl_code(env->pc) >> 21) << 4;
if (rw) {
opc |= 0x9;
} else {
opc |= 0x4;
}
env->ipr[IPR_MM_STAT] = opc;
}
return 1;
}
int cpu_alpha_mfpr (CPUState *env, int iprn, uint64_t *valp)
{
uint64_t hwpcb;
int ret = 0;
hwpcb = env->ipr[IPR_PCBB];
switch (iprn) {
case IPR_ASN:
if (env->features & FEATURE_ASN)
*valp = env->ipr[IPR_ASN];
else
*valp = 0;
break;
case IPR_ASTEN:
*valp = ((int64_t)(env->ipr[IPR_ASTEN] << 60)) >> 60;
break;
case IPR_ASTSR:
*valp = ((int64_t)(env->ipr[IPR_ASTSR] << 60)) >> 60;
break;
case IPR_DATFX:
/* Write only */
ret = -1;
break;
case IPR_ESP:
if (env->features & FEATURE_SPS)
*valp = env->ipr[IPR_ESP];
else
*valp = ldq_raw(hwpcb + 8);
break;
case IPR_FEN:
*valp = ((int64_t)(env->ipr[IPR_FEN] << 63)) >> 63;
break;
case IPR_IPIR:
/* Write-only */
ret = -1;
break;
case IPR_IPL:
*valp = ((int64_t)(env->ipr[IPR_IPL] << 59)) >> 59;
break;
case IPR_KSP:
if (!(env->ipr[IPR_EXC_ADDR] & 1)) {
ret = -1;
} else {
if (env->features & FEATURE_SPS)
*valp = env->ipr[IPR_KSP];
else
*valp = ldq_raw(hwpcb + 0);
}
break;
case IPR_MCES:
*valp = ((int64_t)(env->ipr[IPR_MCES] << 59)) >> 59;
break;
case IPR_PERFMON:
/* Implementation specific */
*valp = 0;
break;
case IPR_PCBB:
*valp = ((int64_t)env->ipr[IPR_PCBB] << 16) >> 16;
break;
case IPR_PRBR:
*valp = env->ipr[IPR_PRBR];
break;
case IPR_PTBR:
*valp = env->ipr[IPR_PTBR];
break;
case IPR_SCBB:
*valp = (int64_t)((int32_t)env->ipr[IPR_SCBB]);
break;
case IPR_SIRR:
/* Write-only */
ret = -1;
break;
case IPR_SISR:
*valp = (int64_t)((int16_t)env->ipr[IPR_SISR]);
case IPR_SSP:
if (env->features & FEATURE_SPS)
*valp = env->ipr[IPR_SSP];
else
*valp = ldq_raw(hwpcb + 16);
break;
case IPR_SYSPTBR:
if (env->features & FEATURE_VIRBND)
*valp = env->ipr[IPR_SYSPTBR];
else
ret = -1;
break;
case IPR_TBCHK:
if ((env->features & FEATURE_TBCHK)) {
/* XXX: TODO */
*valp = 0;
ret = -1;
} else {
ret = -1;
}
break;
case IPR_TBIA:
/* Write-only */
ret = -1;
break;
case IPR_TBIAP:
/* Write-only */
ret = -1;
break;
case IPR_TBIS:
/* Write-only */
ret = -1;
break;
case IPR_TBISD:
/* Write-only */
ret = -1;
break;
case IPR_TBISI:
/* Write-only */
ret = -1;
break;
case IPR_USP:
if (env->features & FEATURE_SPS)
*valp = env->ipr[IPR_USP];
else
*valp = ldq_raw(hwpcb + 24);
break;
case IPR_VIRBND:
if (env->features & FEATURE_VIRBND)
*valp = env->ipr[IPR_VIRBND];
else
ret = -1;
break;
case IPR_VPTB:
*valp = env->ipr[IPR_VPTB];
break;
case IPR_WHAMI:
*valp = env->ipr[IPR_WHAMI];
break;
default:
/* Invalid */
ret = -1;
break;
}
return ret;
}
int cpu_alpha_mtpr (CPUState *env, int iprn, uint64_t val, uint64_t *oldvalp)
{
uint64_t hwpcb, tmp64;
uint8_t tmp8;
int ret = 0;
hwpcb = env->ipr[IPR_PCBB];
switch (iprn) {
case IPR_ASN:
/* Read-only */
ret = -1;
break;
case IPR_ASTEN:
tmp8 = ((int8_t)(env->ipr[IPR_ASTEN] << 4)) >> 4;
*oldvalp = tmp8;
tmp8 &= val & 0xF;
tmp8 |= (val >> 4) & 0xF;
env->ipr[IPR_ASTEN] &= ~0xF;
env->ipr[IPR_ASTEN] |= tmp8;
ret = 1;
break;
case IPR_ASTSR:
tmp8 = ((int8_t)(env->ipr[IPR_ASTSR] << 4)) >> 4;
*oldvalp = tmp8;
tmp8 &= val & 0xF;
tmp8 |= (val >> 4) & 0xF;
env->ipr[IPR_ASTSR] &= ~0xF;
env->ipr[IPR_ASTSR] |= tmp8;
ret = 1;
case IPR_DATFX:
env->ipr[IPR_DATFX] &= ~0x1;
env->ipr[IPR_DATFX] |= val & 1;
tmp64 = ldq_raw(hwpcb + 56);
tmp64 &= ~0x8000000000000000ULL;
tmp64 |= (val & 1) << 63;
stq_raw(hwpcb + 56, tmp64);
break;
case IPR_ESP:
if (env->features & FEATURE_SPS)
env->ipr[IPR_ESP] = val;
else
stq_raw(hwpcb + 8, val);
break;
case IPR_FEN:
env->ipr[IPR_FEN] = val & 1;
tmp64 = ldq_raw(hwpcb + 56);
tmp64 &= ~1;
tmp64 |= val & 1;
stq_raw(hwpcb + 56, tmp64);
break;
case IPR_IPIR:
/* XXX: TODO: Send IRQ to CPU #ir[16] */
break;
case IPR_IPL:
*oldvalp = ((int64_t)(env->ipr[IPR_IPL] << 59)) >> 59;
env->ipr[IPR_IPL] &= ~0x1F;
env->ipr[IPR_IPL] |= val & 0x1F;
/* XXX: may issue an interrupt or ASR _now_ */
ret = 1;
break;
case IPR_KSP:
if (!(env->ipr[IPR_EXC_ADDR] & 1)) {
ret = -1;
} else {
if (env->features & FEATURE_SPS)
env->ipr[IPR_KSP] = val;
else
stq_raw(hwpcb + 0, val);
}
break;
case IPR_MCES:
env->ipr[IPR_MCES] &= ~((val & 0x7) | 0x18);
env->ipr[IPR_MCES] |= val & 0x18;
break;
case IPR_PERFMON:
/* Implementation specific */
*oldvalp = 0;
ret = 1;
break;
case IPR_PCBB:
/* Read-only */
ret = -1;
break;
case IPR_PRBR:
env->ipr[IPR_PRBR] = val;
break;
case IPR_PTBR:
/* Read-only */
ret = -1;
break;
case IPR_SCBB:
env->ipr[IPR_SCBB] = (uint32_t)val;
break;
case IPR_SIRR:
if (val & 0xF) {
env->ipr[IPR_SISR] |= 1 << (val & 0xF);
/* XXX: request a software interrupt _now_ */
}
break;
case IPR_SISR:
/* Read-only */
ret = -1;
break;
case IPR_SSP:
if (env->features & FEATURE_SPS)
env->ipr[IPR_SSP] = val;
else
stq_raw(hwpcb + 16, val);
break;
case IPR_SYSPTBR:
if (env->features & FEATURE_VIRBND)
env->ipr[IPR_SYSPTBR] = val;
else
ret = -1;
case IPR_TBCHK:
/* Read-only */
ret = -1;
break;
case IPR_TBIA:
tlb_flush(env, 1);
break;
case IPR_TBIAP:
tlb_flush(env, 1);
break;
case IPR_TBIS:
tlb_flush_page(env, val);
break;
case IPR_TBISD:
tlb_flush_page(env, val);
break;
case IPR_TBISI:
tlb_flush_page(env, val);
break;
case IPR_USP:
if (env->features & FEATURE_SPS)
env->ipr[IPR_USP] = val;
else
stq_raw(hwpcb + 24, val);
break;
case IPR_VIRBND:
if (env->features & FEATURE_VIRBND)
env->ipr[IPR_VIRBND] = val;
else
ret = -1;
break;
case IPR_VPTB:
env->ipr[IPR_VPTB] = val;
break;
case IPR_WHAMI:
/* Read-only */
ret = -1;
break;
default:
/* Invalid */
ret = -1;
break;
}
return ret;
}
void do_interrupt (CPUState *env)
{
int excp;
env->ipr[IPR_EXC_ADDR] = env->pc | 1;
excp = env->exception_index;
env->exception_index = 0;
env->error_code = 0;
/* XXX: disable interrupts and memory mapping */
if (env->ipr[IPR_PAL_BASE] != -1ULL) {
/* We use native PALcode */
env->pc = env->ipr[IPR_PAL_BASE] + excp;
} else {
/* We use emulated PALcode */
call_pal(env);
/* Emulate REI */
env->pc = env->ipr[IPR_EXC_ADDR] & ~7;
env->ipr[IPR_EXC_ADDR] = env->ipr[IPR_EXC_ADDR] & 1;
/* XXX: re-enable interrupts and memory mapping */
}
}
#endif
void cpu_dump_state (CPUState *env, FILE *f,
int (*cpu_fprintf)(FILE *f, const char *fmt, ...),
int flags)
{
static const char *linux_reg_names[] = {
"v0 ", "t0 ", "t1 ", "t2 ", "t3 ", "t4 ", "t5 ", "t6 ",
"t7 ", "s0 ", "s1 ", "s2 ", "s3 ", "s4 ", "s5 ", "fp ",
"a0 ", "a1 ", "a2 ", "a3 ", "a4 ", "a5 ", "t8 ", "t9 ",
"t10", "t11", "ra ", "t12", "at ", "gp ", "sp ", "zero",
};
int i;
cpu_fprintf(f, " PC " TARGET_FMT_lx " PS " TARGET_FMT_lx "\n",
env->pc, env->ps);
for (i = 0; i < 31; i++) {
cpu_fprintf(f, "IR%02d %s " TARGET_FMT_lx " ", i,
linux_reg_names[i], env->ir[i]);
if ((i % 3) == 2)
cpu_fprintf(f, "\n");
}
cpu_fprintf(f, "\n");
for (i = 0; i < 31; i++) {
cpu_fprintf(f, "FIR%02d " TARGET_FMT_lx " ", i,
*((uint64_t *)(&env->fir[i])));
if ((i % 3) == 2)
cpu_fprintf(f, "\n");
}
cpu_fprintf(f, "\nlock " TARGET_FMT_lx "\n", env->lock);
}
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