Archipelago » qemu

/*

 *  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 */

/* 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)

{

    env->mmuregs[4] = address;

    if (rw & 2)

        env->exception_index = TT_TFAULT;

    else

        env->exception_index = TT_DFAULT;

    return 1;

}

#else

#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);

            }

        }

        cpu_loop_exit();

    }

    env = saved_env;

}

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)

{

    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) | 2;

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

    if ((env->mmuregs[0] & MMU_NF) || env->psret == 0)  {

        // No fault

        cpu_abort(env, "Unsupported MMU no fault case");

    }

    if (rw & 2)

        env->exception_index = TT_TFAULT;

    else

        env->exception_index = TT_DFAULT;

    return 1;

}

#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];

}

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;

}

void do_interrupt(int intno)

{

    int cwp;

#ifdef DEBUG_PCALL

    if (loglevel & CPU_LOG_INT) {

        static int count;

        fprintf(logfile, "%6d: v=%02x pc=%08x npc=%08x SP=%08x\n",

                count, intno,

                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 0x%02x while interrupts disabled, Error state", env->exception_index);

        return;

    }

#endif

    env->psret = 0;

    cwp = (env->cwp - 1) & (NWINDOWS - 1); 

    set_cwp(cwp);

    env->regwptr[9] = env->pc;

    env->regwptr[10] = env->npc;

    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;

}

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

}