Archipelago » qemu

/*

 *  MicroBlaze helper routines.

 *

 *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>

 *

 * 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 <stdio.h>

#include <string.h>

#include <assert.h>

#include "config.h"

#include "cpu.h"

#include "host-utils.h"

#define D(x)

#define DMMU(x)

#if defined(CONFIG_USER_ONLY)

void do_interrupt (CPUState *env)

{

    env->exception_index = -1;

    env->regs[14] = env->sregs[SR_PC];

}

int cpu_mb_handle_mmu_fault(CPUState * env, target_ulong address, int rw,

                            int mmu_idx)

{

    env->exception_index = 0xaa;

    cpu_dump_state(env, stderr, fprintf, 0);

    return 1;

}

#else /* !CONFIG_USER_ONLY */

int cpu_mb_handle_mmu_fault (CPUState *env, target_ulong address, int rw,

                             int mmu_idx)

{

    unsigned int hit;

    unsigned int mmu_available;

    int r = 1;

    int prot;

    mmu_available = 0;

    if (env->pvr.regs[0] & PVR0_USE_MMU) {

        mmu_available = 1;

        if ((env->pvr.regs[0] & PVR0_PVR_FULL_MASK)

            && (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {

            mmu_available = 0;

        }

    }

    /* Translate if the MMU is available and enabled.  */

    if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {

        target_ulong vaddr, paddr;

        struct microblaze_mmu_lookup lu;

        hit = mmu_translate(&env->mmu, &lu, address, rw, mmu_idx);

        if (hit) {

            vaddr = address & TARGET_PAGE_MASK;

            paddr = lu.paddr + vaddr - lu.vaddr;

            DMMU(qemu_log("MMU map mmu=%d v=%x p=%x prot=%x\n",

                     mmu_idx, vaddr, paddr, lu.prot));

            tlb_set_page(env, vaddr, paddr, lu.prot, mmu_idx, TARGET_PAGE_SIZE);

            r = 0;

        } else {

            env->sregs[SR_EAR] = address;

            DMMU(qemu_log("mmu=%d miss v=%x\n", mmu_idx, address));

            switch (lu.err) {

                case ERR_PROT:

                    env->sregs[SR_ESR] = rw == 2 ? 17 : 16;

                    env->sregs[SR_ESR] |= (rw == 1) << 10;

                    break;

                case ERR_MISS:

                    env->sregs[SR_ESR] = rw == 2 ? 19 : 18;

                    env->sregs[SR_ESR] |= (rw == 1) << 10;

                    break;

                default:

                    abort();

                    break;

            }

            if (env->exception_index == EXCP_MMU) {

                cpu_abort(env, "recursive faults\n");

            }

            /* TLB miss.  */

            env->exception_index = EXCP_MMU;

        }

    } else {

        /* MMU disabled or not available.  */

        address &= TARGET_PAGE_MASK;

        prot = PAGE_BITS;

        tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);

        r = 0;

    }

    return r;

}

void do_interrupt(CPUState *env)

{

    uint32_t t;

    /* IMM flag cannot propagate across a branch and into the dslot.  */

    assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));

    assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));

/*    assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions.  */

    switch (env->exception_index) {

        case EXCP_HW_EXCP:

            if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {

                qemu_log("Exception raised on system without exceptions!\n");

                return;

            }

            env->regs[17] = env->sregs[SR_PC] + 4;

            env->sregs[SR_ESR] &= ~(1 << 12);

            /* Exception breaks branch + dslot sequence?  */

            if (env->iflags & D_FLAG) {

                env->sregs[SR_ESR] |= 1 << 12 ;

                env->sregs[SR_BTR] = env->btarget;

            }

            /* Disable the MMU.  */

            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;

            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);

            env->sregs[SR_MSR] |= t;

            /* Exception in progress.  */

            env->sregs[SR_MSR] |= MSR_EIP;

            qemu_log_mask(CPU_LOG_INT,

                          "hw exception at pc=%x ear=%x esr=%x iflags=%x\n",

                          env->sregs[SR_PC], env->sregs[SR_EAR],

                          env->sregs[SR_ESR], env->iflags);

            log_cpu_state_mask(CPU_LOG_INT, env, 0);

            env->iflags &= ~(IMM_FLAG | D_FLAG);

            env->sregs[SR_PC] = 0x20;

            break;

        case EXCP_MMU:

            env->regs[17] = env->sregs[SR_PC];

            env->sregs[SR_ESR] &= ~(1 << 12);

            /* Exception breaks branch + dslot sequence?  */

            if (env->iflags & D_FLAG) {

                D(qemu_log("D_FLAG set at exception bimm=%d\n", env->bimm));

                env->sregs[SR_ESR] |= 1 << 12 ;

                env->sregs[SR_BTR] = env->btarget;

                /* Reexecute the branch.  */

                env->regs[17] -= 4;

                /* was the branch immprefixed?.  */

                if (env->bimm) {

                    qemu_log_mask(CPU_LOG_INT,

                                  "bimm exception at pc=%x iflags=%x\n",

                                  env->sregs[SR_PC], env->iflags);

                    env->regs[17] -= 4;

                    log_cpu_state_mask(CPU_LOG_INT, env, 0);

                }

            } else if (env->iflags & IMM_FLAG) {

                D(qemu_log("IMM_FLAG set at exception\n"));

                env->regs[17] -= 4;

            }

            /* Disable the MMU.  */

            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;

            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);

            env->sregs[SR_MSR] |= t;

            /* Exception in progress.  */

            env->sregs[SR_MSR] |= MSR_EIP;

            qemu_log_mask(CPU_LOG_INT,

                          "exception at pc=%x ear=%x iflags=%x\n",

                          env->sregs[SR_PC], env->sregs[SR_EAR], env->iflags);

            log_cpu_state_mask(CPU_LOG_INT, env, 0);

            env->iflags &= ~(IMM_FLAG | D_FLAG);

            env->sregs[SR_PC] = 0x20;

            break;

        case EXCP_IRQ:

            assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));

            assert(env->sregs[SR_MSR] & MSR_IE);

            assert(!(env->iflags & D_FLAG));

            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;

#if 0

#include "disas.h"

/* Useful instrumentation when debugging interrupt issues in either

   the models or in sw.  */

            {

                const char *sym;

                sym = lookup_symbol(env->sregs[SR_PC]);

                if (sym

                    && (!strcmp("netif_rx", sym)

                        || !strcmp("process_backlog", sym))) {

                    qemu_log(

                         "interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",

                         env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags,

                         sym);

                    log_cpu_state(env, 0);

                }

            }

#endif

            qemu_log_mask(CPU_LOG_INT,

                         "interrupt at pc=%x msr=%x %x iflags=%x\n",

                         env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);

            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \

                                    | MSR_UM | MSR_IE);

            env->sregs[SR_MSR] |= t;

            env->regs[14] = env->sregs[SR_PC];

            env->sregs[SR_PC] = 0x10;

            //log_cpu_state_mask(CPU_LOG_INT, env, 0);

            break;

        case EXCP_BREAK:

        case EXCP_HW_BREAK:

            assert(!(env->iflags & IMM_FLAG));

            assert(!(env->iflags & D_FLAG));

            t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;

            qemu_log_mask(CPU_LOG_INT,

                        "break at pc=%x msr=%x %x iflags=%x\n",

                        env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);

            log_cpu_state_mask(CPU_LOG_INT, env, 0);

            env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);

            env->sregs[SR_MSR] |= t;

            env->sregs[SR_MSR] |= MSR_BIP;

            if (env->exception_index == EXCP_HW_BREAK) {

                env->regs[16] = env->sregs[SR_PC];

                env->sregs[SR_MSR] |= MSR_BIP;

                env->sregs[SR_PC] = 0x18;

            } else

                env->sregs[SR_PC] = env->btarget;

            break;

        default:

            cpu_abort(env, "unhandled exception type=%d\n",

                      env->exception_index);

            break;

    }

}

target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)

{

    target_ulong vaddr, paddr = 0;

    struct microblaze_mmu_lookup lu;

    unsigned int hit;

    if (env->sregs[SR_MSR] & MSR_VM) {

        hit = mmu_translate(&env->mmu, &lu, addr, 0, 0);

        if (hit) {

            vaddr = addr & TARGET_PAGE_MASK;

            paddr = lu.paddr + vaddr - lu.vaddr;

        } else

            paddr = 0; /* ???.  */

    } else

        paddr = addr & TARGET_PAGE_MASK;

    return paddr;

}

#endif