qemu/target-sparc/helper.c

/*
 *  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 <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <signal.h>
#include <assert.h>

#include "cpu.h"
#include "exec-all.h"

//#define DEBUG_PCALL
//#define DEBUG_MMU

/* Sparc MMU emulation */

/* 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) 

int cpu_sparc_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
                               int is_user, int is_softmmu)
{
    if (rw & 2)
        env->exception_index = TT_TFAULT;
    else
        env->exception_index = TT_DFAULT;
    return 1;
}

#else

#ifndef TARGET_SPARC64
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;
    }

    *access_index = ((rw & 1) << 2) | (rw & 2) | (is_user? 0 : 1);
    *physical = 0xfffff000;

    /* SPARC reference MMU table walk: Context table->L1->L2->PTE */
    /* Context base + context number */
    pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 2);
    pde = ldl_phys(pde_ptr);

    /* Ctx pde */
    switch (pde & PTE_ENTRYTYPE_MASK) {
    default:
    case 0: /* Invalid */
	return 1 << 2;
    case 2: /* L0 PTE, maybe should not happen? */
    case 3: /* Reserved */
        return 4 << 2;
    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 << 8) | (1 << 2);
	case 3: /* Reserved */
	    return (1 << 8) | (4 << 2);
	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 (2 << 8) | (1 << 2);
	    case 3: /* Reserved */
		return (2 << 8) | (4 << 2);
	    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 (3 << 8) | (1 << 2);
		case 1: /* PDE, should not happen */
		case 3: /* Reserved */
		    return (3 << 8) | (4 << 2);
		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_perms = (pde & PTE_ACCESS_MASK) >> PTE_ACCESS_SHIFT;
    error_code = access_table[*access_index][access_perms];
    if (error_code && !(env->mmuregs[0] & MMU_NF))
	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 error_code;
}

/* Perform address translation */
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                              int is_user, int is_softmmu)
{
    target_ulong virt_addr;
    target_phys_addr_t paddr;
    unsigned long vaddr;
    int error_code = 0, prot, ret = 0, access_index;

    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;
    env->mmuregs[4] = address; /* Fault address register */

    if ((env->mmuregs[0] & MMU_NF) || env->psret == 0)  {
        // No fault mode: if a mapping is available, just override
        // permissions. If no mapping is available, redirect accesses to
        // neverland. Fake/overridden mappings will be flushed when
        // switching to normal mode.
	vaddr = address & TARGET_PAGE_MASK;
        prot = PAGE_READ | PAGE_WRITE;
        ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu);
	return ret;
    } else {
        if (rw & 2)
            env->exception_index = TT_TFAULT;
        else
            env->exception_index = TT_DFAULT;
        return 1;
    }
}
#else
static int get_physical_address_data(CPUState *env, target_phys_addr_t *physical, int *prot,
			  int *access_index, target_ulong address, int rw,
			  int is_user)
{
    target_ulong mask;
    unsigned int i;

    if ((env->lsu & DMMU_E) == 0) { /* DMMU disabled */
	*physical = address & 0xffffffff;
	*prot = PAGE_READ | PAGE_WRITE;
        return 0;
    }

    for (i = 0; i < 64; i++) {
	if ((env->dtlb_tte[i] & 0x8000000000000000ULL) != 0) {
	    switch (env->dtlb_tte[i] >> 60) {
	    default:
	    case 0x4: // 8k
		mask = 0xffffffffffffe000ULL;
		break;
	    case 0x5: // 64k
		mask = 0xffffffffffff0000ULL;
		break;
	    case 0x6: // 512k
		mask = 0xfffffffffff80000ULL;
		break;
	    case 0x7: // 4M
		mask = 0xffffffffffc00000ULL;
		break;
	    }
	    // ctx match, vaddr match?
	    if (env->dmmuregs[1] == (env->dtlb_tag[i] & 0x1fff) &&
		(address & mask) == (env->dtlb_tag[i] & ~0x1fffULL)) {
		// access ok?
		if (((env->dtlb_tte[i] & 0x4) && !(env->pstate & PS_PRIV)) ||
		    (!(env->dtlb_tte[i] & 0x2) && (rw == 1))) {
		    env->exception_index = TT_DFAULT;
		    return 1;
		}
		*physical = env->dtlb_tte[i] & 0xffffe000;
		*prot = PAGE_READ;
		if (env->dtlb_tte[i] & 0x2)
		    *prot |= PAGE_WRITE;
		return 0;
	    }
	}
    }
    env->exception_index = TT_DFAULT;
    return 1;
}

static int get_physical_address_code(CPUState *env, target_phys_addr_t *physical, int *prot,
			  int *access_index, target_ulong address, int rw,
			  int is_user)
{
    target_ulong mask;
    unsigned int i;

    if ((env->lsu & IMMU_E) == 0) { /* IMMU disabled */
	*physical = address & 0xffffffff;
	*prot = PAGE_READ;
        return 0;
    }
    for (i = 0; i < 64; i++) {
	if ((env->itlb_tte[i] & 0x8000000000000000ULL) != 0) {
	    switch (env->itlb_tte[i] >> 60) {
	    default:
	    case 0x4: // 8k
		mask = 0xffffffffffffe000ULL;
		break;
	    case 0x5: // 64k
		mask = 0xffffffffffff0000ULL;
		break;
	    case 0x6: // 512k
		mask = 0xfffffffffff80000ULL;
		break;
	    case 0x7: // 4M
		mask = 0xffffffffffc00000ULL;
		break;
	    }
	    // ctx match, vaddr match?
	    if (env->immuregs[1] == (env->itlb_tag[i] & 0x1fff) &&
		(address & mask) == (env->itlb_tag[i] & ~0x1fffULL)) {
		// access ok?
		if ((env->itlb_tte[i] & 0x4) && !(env->pstate & PS_PRIV)) {
		    env->exception_index = TT_TFAULT;
		    return 1;
		}
		*physical = env->itlb_tte[i] & 0xffffe000;
		*prot = PAGE_READ;
		return 0;
	    }
	}
    }
    env->exception_index = TT_TFAULT;
    return 1;
}

int get_physical_address(CPUState *env, target_phys_addr_t *physical, int *prot,
			  int *access_index, target_ulong address, int rw,
			  int is_user)
{
    if (rw == 2)
	return get_physical_address_code(env, physical, prot, access_index, address, rw, is_user);
    else
	return get_physical_address_data(env, physical, prot, access_index, address, rw, is_user);
}

/* Perform address translation */
int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                              int is_user, int is_softmmu)
{
    target_ulong virt_addr;
    target_phys_addr_t paddr;
    unsigned long vaddr;
    int error_code = 0, prot, ret = 0, access_index;

    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;
    }
    // XXX
    return 1;
}

#endif
#endif

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];
}

#if !defined(TARGET_SPARC64)
target_ulong mmu_probe(CPUState *env, 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] << 2);
    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;
}

#ifdef DEBUG_MMU
void dump_mmu(CPUState *env)
{
     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] << 2);
    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(env, 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(env, 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(env, 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
#endif