Archipelago » qemu

/*

 * Sparc32 interrupt helpers

 *

 *  Copyright (c) 2003-2005 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, see <http://www.gnu.org/licenses/>.

 */

#include "cpu.h"

#include "trace.h"

#include "sysemu/sysemu.h"

#define DEBUG_PCALL

#ifdef DEBUG_PCALL

static const char * const excp_names[0x80] = {

    [TT_TFAULT] = "Instruction Access Fault",

    [TT_ILL_INSN] = "Illegal Instruction",

    [TT_PRIV_INSN] = "Privileged Instruction",

    [TT_NFPU_INSN] = "FPU Disabled",

    [TT_WIN_OVF] = "Window Overflow",

    [TT_WIN_UNF] = "Window Underflow",

    [TT_UNALIGNED] = "Unaligned Memory Access",

    [TT_FP_EXCP] = "FPU Exception",

    [TT_DFAULT] = "Data Access Fault",

    [TT_TOVF] = "Tag Overflow",

    [TT_EXTINT | 0x1] = "External Interrupt 1",

    [TT_EXTINT | 0x2] = "External Interrupt 2",

    [TT_EXTINT | 0x3] = "External Interrupt 3",

    [TT_EXTINT | 0x4] = "External Interrupt 4",

    [TT_EXTINT | 0x5] = "External Interrupt 5",

    [TT_EXTINT | 0x6] = "External Interrupt 6",

    [TT_EXTINT | 0x7] = "External Interrupt 7",

    [TT_EXTINT | 0x8] = "External Interrupt 8",

    [TT_EXTINT | 0x9] = "External Interrupt 9",

    [TT_EXTINT | 0xa] = "External Interrupt 10",

    [TT_EXTINT | 0xb] = "External Interrupt 11",

    [TT_EXTINT | 0xc] = "External Interrupt 12",

    [TT_EXTINT | 0xd] = "External Interrupt 13",

    [TT_EXTINT | 0xe] = "External Interrupt 14",

    [TT_EXTINT | 0xf] = "External Interrupt 15",

    [TT_TOVF] = "Tag Overflow",

    [TT_CODE_ACCESS] = "Instruction Access Error",

    [TT_DATA_ACCESS] = "Data Access Error",

    [TT_DIV_ZERO] = "Division By Zero",

    [TT_NCP_INSN] = "Coprocessor Disabled",

};

#endif

void do_interrupt(CPUSPARCState *env)

{

    int cwp, intno = env->exception_index;

    /* Compute PSR before exposing state.  */

    if (env->cc_op != CC_OP_FLAGS) {

        cpu_get_psr(env);

    }

#ifdef DEBUG_PCALL

    if (qemu_loglevel_mask(CPU_LOG_INT)) {

        static int count;

        const char *name;

        if (intno < 0 || intno >= 0x100) {

            name = "Unknown";

        } else if (intno >= 0x80) {

            name = "Trap Instruction";

        } else {

            name = excp_names[intno];

            if (!name) {

                name = "Unknown";

            }

        }

        qemu_log("%6d: %s (v=%02x)\n", count, name, intno);

        log_cpu_state(env, 0);

#if 0

        {

            int i;

            uint8_t *ptr;

            qemu_log("       code=");

            ptr = (uint8_t *)env->pc;

            for (i = 0; i < 16; i++) {

                qemu_log(" %02x", ldub(ptr + i));

            }

            qemu_log("\n");

        }

#endif

        count++;

    }

#endif

#if !defined(CONFIG_USER_ONLY)

    if (env->psret == 0) {

        if (env->exception_index == 0x80 &&

            env->def->features & CPU_FEATURE_TA0_SHUTDOWN) {

            qemu_system_shutdown_request();

        } else {

            cpu_abort(env, "Trap 0x%02x while interrupts disabled, Error state",

                      env->exception_index);

        }

        return;

    }

#endif

    env->psret = 0;

    cwp = cpu_cwp_dec(env, env->cwp - 1);

    cpu_set_cwp(env, 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 = -1;

#if !defined(CONFIG_USER_ONLY)

    /* IRQ acknowledgment */

    if ((intno & ~15) == TT_EXTINT && env->qemu_irq_ack != NULL) {

        env->qemu_irq_ack(env, env->irq_manager, intno);

    }

#endif

}

#if !defined(CONFIG_USER_ONLY)

static void leon3_cache_control_int(CPUSPARCState *env)

{

    uint32_t state = 0;

    if (env->cache_control & CACHE_CTRL_IF) {

        /* Instruction cache state */

        state = env->cache_control & CACHE_STATE_MASK;

        if (state == CACHE_ENABLED) {

            state = CACHE_FROZEN;

            trace_int_helper_icache_freeze();

        }

        env->cache_control &= ~CACHE_STATE_MASK;

        env->cache_control |= state;

    }

    if (env->cache_control & CACHE_CTRL_DF) {

        /* Data cache state */

        state = (env->cache_control >> 2) & CACHE_STATE_MASK;

        if (state == CACHE_ENABLED) {

            state = CACHE_FROZEN;

            trace_int_helper_dcache_freeze();

        }

        env->cache_control &= ~(CACHE_STATE_MASK << 2);

        env->cache_control |= (state << 2);

    }

}

void leon3_irq_manager(CPUSPARCState *env, void *irq_manager, int intno)

{

    leon3_irq_ack(irq_manager, intno);

    leon3_cache_control_int(env);

}

#endif