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FRET-qemu/target-sparc/helper.c
bellard af7bf89b1f initial sparc64 support - sparc fixes (Blue Swirl) 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1251 c046a42c-6fe2-441c-8c8c-71466251a162
2005-01-30 22:39:04 +00:00

451 lines
12 KiB
C
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/*
* sparc helpers
*
* Copyright (c) 2003 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "exec.h"
//#define DEBUG_PCALL
//#define DEBUG_MMU
/* Sparc MMU emulation */
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int is_user, int is_softmmu);
/* thread support */
spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
void cpu_lock(void)
{
spin_lock(&global_cpu_lock);
}
void cpu_unlock(void)
{
spin_unlock(&global_cpu_lock);
}
#if !defined(CONFIG_USER_ONLY)
#define MMUSUFFIX _mmu
#define GETPC() (__builtin_return_address(0))
#define SHIFT 0
#include "softmmu_template.h"
#define SHIFT 1
#include "softmmu_template.h"
#define SHIFT 2
#include "softmmu_template.h"
#define SHIFT 3
#include "softmmu_template.h"
/* try to fill the TLB and return an exception if error. If retaddr is
NULL, it means that the function was called in C code (i.e. not
from generated code or from helper.c) */
/* XXX: fix it to restore all registers */
void tlb_fill(target_ulong addr, int is_write, int is_user, void *retaddr)
{
TranslationBlock *tb;
int ret;
unsigned long pc;
CPUState *saved_env;
/* XXX: hack to restore env in all cases, even if not called from
generated code */
saved_env = env;
env = cpu_single_env;
ret = cpu_sparc_handle_mmu_fault(env, addr, is_write, is_user, 1);
if (ret) {
if (retaddr) {
/* now we have a real cpu fault */
pc = (unsigned long)retaddr;
tb = tb_find_pc(pc);
if (tb) {
/* the PC is inside the translated code. It means that we have
a virtual CPU fault */
cpu_restore_state(tb, env, pc, NULL);
}
}
raise_exception_err(ret, env->error_code);
}
env = saved_env;
}
#endif
static const int access_table[8][8] = {
{ 0, 0, 0, 0, 2, 0, 3, 3 },
{ 0, 0, 0, 0, 2, 0, 0, 0 },
{ 2, 2, 0, 0, 0, 2, 3, 3 },
{ 2, 2, 0, 0, 0, 2, 0, 0 },
{ 2, 0, 2, 0, 2, 2, 3, 3 },
{ 2, 0, 2, 0, 2, 0, 2, 0 },
{ 2, 2, 2, 0, 2, 2, 3, 3 },
{ 2, 2, 2, 0, 2, 2, 2, 0 }
};
/* 1 = write OK */
static const int rw_table[2][8] = {
{ 0, 1, 0, 1, 0, 1, 0, 1 },
{ 0, 1, 0, 1, 0, 0, 0, 0 }
};
int get_physical_address (CPUState *env, target_phys_addr_t *physical, int *prot,
int *access_index, target_ulong address, int rw,
int is_user)
{
int access_perms = 0;
target_phys_addr_t pde_ptr;
uint32_t pde;
target_ulong virt_addr;
int error_code = 0, is_dirty;
unsigned long page_offset;
virt_addr = address & TARGET_PAGE_MASK;
if ((env->mmuregs[0] & MMU_E) == 0) { /* MMU disabled */
*physical = address;
*prot = PAGE_READ | PAGE_WRITE;
return 0;
}
/* SPARC reference MMU table walk: Context table->L1->L2->PTE */
/* Context base + context number */
pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4);
pde = ldl_phys(pde_ptr);
/* Ctx pde */
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
return 1;
case 2: /* L0 PTE, maybe should not happen? */
case 3: /* Reserved */
return 4;
case 1: /* L0 PDE */
pde_ptr = ((address >> 22) & ~3) + ((pde & ~3) << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
return 1;
case 3: /* Reserved */
return 4;
case 1: /* L1 PDE */
pde_ptr = ((address & 0xfc0000) >> 16) + ((pde & ~3) << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
return 1;
case 3: /* Reserved */
return 4;
case 1: /* L2 PDE */
pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
return 1;
case 1: /* PDE, should not happen */
case 3: /* Reserved */
return 4;
case 2: /* L3 PTE */
virt_addr = address & TARGET_PAGE_MASK;
page_offset = (address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1);
}
break;
case 2: /* L2 PTE */
virt_addr = address & ~0x3ffff;
page_offset = address & 0x3ffff;
}
break;
case 2: /* L1 PTE */
virt_addr = address & ~0xffffff;
page_offset = address & 0xffffff;
}
}
/* update page modified and dirty bits */
is_dirty = (rw & 1) && !(pde & PG_MODIFIED_MASK);
if (!(pde & PG_ACCESSED_MASK) || is_dirty) {
pde |= PG_ACCESSED_MASK;
if (is_dirty)
pde |= PG_MODIFIED_MASK;
stl_phys_notdirty(pde_ptr, pde);
}
/* check access */
*access_index = ((rw & 1) << 2) | (rw & 2) | (is_user? 0 : 1);
access_perms = (pde & PTE_ACCESS_MASK) >> PTE_ACCESS_SHIFT;
error_code = access_table[*access_index][access_perms];
if (error_code)
return error_code;
/* the page can be put in the TLB */
*prot = PAGE_READ;
if (pde & PG_MODIFIED_MASK) {
/* only set write access if already dirty... otherwise wait
for dirty access */
if (rw_table[is_user][access_perms])
*prot |= PAGE_WRITE;
}
/* Even if large ptes, we map only one 4KB page in the cache to
avoid filling it too fast */
*physical = ((pde & PTE_ADDR_MASK) << 4) + page_offset;
return 0;
}
/* Perform address translation */
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int is_user, int is_softmmu)
{
int exception = 0;
target_ulong virt_addr;
target_phys_addr_t paddr;
unsigned long vaddr;
int error_code = 0, prot, ret = 0, access_index;
if (env->user_mode_only) {
/* user mode only emulation */
error_code = -2;
goto do_fault_user;
}
error_code = get_physical_address(env, &paddr, &prot, &access_index, address, rw, is_user);
if (error_code == 0) {
virt_addr = address & TARGET_PAGE_MASK;
vaddr = virt_addr + ((address & TARGET_PAGE_MASK) & (TARGET_PAGE_SIZE - 1));
ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu);
return ret;
}
if (env->mmuregs[3]) /* Fault status register */
env->mmuregs[3] = 1; /* overflow (not read before another fault) */
env->mmuregs[3] |= (access_index << 5) | (error_code << 2) | 2;
env->mmuregs[4] = address; /* Fault address register */
if (env->mmuregs[0] & MMU_NF || env->psret == 0) // No fault
return 0;
do_fault_user:
env->exception_index = exception;
env->error_code = error_code;
return error_code;
}
void memcpy32(target_ulong *dst, const target_ulong *src)
{
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = src[3];
dst[4] = src[4];
dst[5] = src[5];
dst[6] = src[6];
dst[7] = src[7];
}
void set_cwp(int new_cwp)
{
/* put the modified wrap registers at their proper location */
if (env->cwp == (NWINDOWS - 1))
memcpy32(env->regbase, env->regbase + NWINDOWS * 16);
env->cwp = new_cwp;
/* put the wrap registers at their temporary location */
if (new_cwp == (NWINDOWS - 1))
memcpy32(env->regbase + NWINDOWS * 16, env->regbase);
env->regwptr = env->regbase + (new_cwp * 16);
}
void cpu_set_cwp(CPUState *env1, int new_cwp)
{
CPUState *saved_env;
saved_env = env;
env = env1;
set_cwp(new_cwp);
env = saved_env;
}
/*
* Begin execution of an interruption. is_int is TRUE if coming from
* the int instruction. next_eip is the EIP value AFTER the interrupt
* instruction. It is only relevant if is_int is TRUE.
*/
void do_interrupt(int intno, int is_int, int error_code,
unsigned int next_eip, int is_hw)
{
int cwp;
#ifdef DEBUG_PCALL
if (loglevel & CPU_LOG_INT) {
static int count;
fprintf(logfile, "%6d: v=%02x e=%04x i=%d pc=%08x npc=%08x SP=%08x\n",
count, intno, error_code, is_int,
env->pc,
env->npc, env->regwptr[6]);
#if 1
cpu_dump_state(env, logfile, fprintf, 0);
{
int i;
uint8_t *ptr;
fprintf(logfile, " code=");
ptr = (uint8_t *)env->pc;
for(i = 0; i < 16; i++) {
fprintf(logfile, " %02x", ldub(ptr + i));
}
fprintf(logfile, "\n");
}
#endif
count++;
}
#endif
#if !defined(CONFIG_USER_ONLY)
if (env->psret == 0) {
cpu_abort(cpu_single_env, "Trap while interrupts disabled, Error state");
return;
}
#endif
env->psret = 0;
cwp = (env->cwp - 1) & (NWINDOWS - 1);
set_cwp(cwp);
if (intno & 0x80) {
env->regwptr[9] = env->pc;
env->regwptr[10] = env->npc;
} else {
env->regwptr[9] = env->pc - 4; // XXX?
env->regwptr[10] = env->pc;
}
env->psrps = env->psrs;
env->psrs = 1;
env->tbr = (env->tbr & TBR_BASE_MASK) | (intno << 4);
env->pc = env->tbr;
env->npc = env->pc + 4;
env->exception_index = 0;
}
void raise_exception_err(int exception_index, int error_code)
{
raise_exception(exception_index);
}
target_ulong mmu_probe(target_ulong address, int mmulev)
{
target_phys_addr_t pde_ptr;
uint32_t pde;
/* Context base + context number */
pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
case 2: /* PTE, maybe should not happen? */
case 3: /* Reserved */
return 0;
case 1: /* L1 PDE */
if (mmulev == 3)
return pde;
pde_ptr = ((address >> 22) & ~3) + ((pde & ~3) << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
case 3: /* Reserved */
return 0;
case 2: /* L1 PTE */
return pde;
case 1: /* L2 PDE */
if (mmulev == 2)
return pde;
pde_ptr = ((address & 0xfc0000) >> 16) + ((pde & ~3) << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
case 3: /* Reserved */
return 0;
case 2: /* L2 PTE */
return pde;
case 1: /* L3 PDE */
if (mmulev == 1)
return pde;
pde_ptr = ((address & 0x3f000) >> 10) + ((pde & ~3) << 4);
pde = ldl_phys(pde_ptr);
switch (pde & PTE_ENTRYTYPE_MASK) {
default:
case 0: /* Invalid */
case 1: /* PDE, should not happen */
case 3: /* Reserved */
return 0;
case 2: /* L3 PTE */
return pde;
}
}
}
}
return 0;
}
void dump_mmu(void)
{
#ifdef DEBUG_MMU
target_ulong va, va1, va2;
unsigned int n, m, o;
target_phys_addr_t pde_ptr, pa;
uint32_t pde;
printf("MMU dump:\n");
pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4);
pde = ldl_phys(pde_ptr);
printf("Root ptr: " TARGET_FMT_lx ", ctx: %d\n", env->mmuregs[1] << 4, env->mmuregs[2]);
for (n = 0, va = 0; n < 256; n++, va += 16 * 1024 * 1024) {
pde_ptr = mmu_probe(va, 2);
if (pde_ptr) {
pa = cpu_get_phys_page_debug(env, va);
printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va, pa, pde_ptr);
for (m = 0, va1 = va; m < 64; m++, va1 += 256 * 1024) {
pde_ptr = mmu_probe(va1, 1);
if (pde_ptr) {
pa = cpu_get_phys_page_debug(env, va1);
printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va1, pa, pde_ptr);
for (o = 0, va2 = va1; o < 64; o++, va2 += 4 * 1024) {
pde_ptr = mmu_probe(va2, 0);
if (pde_ptr) {
pa = cpu_get_phys_page_debug(env, va2);
printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PTE: " TARGET_FMT_lx "\n", va2, pa, pde_ptr);
}
}
}
}
}
}
printf("MMU dump ends\n");
#endif
}
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