Archipelago » qemu

/*

 *  SH4 emulation

 *

 *  Copyright (c) 2005 Samuel Tardieu

 *

 * 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 <assert.h>

#include "exec.h"

#ifndef CONFIG_USER_ONLY

#define MMUSUFFIX _mmu

#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"

void tlb_fill(target_ulong addr, int is_write, int mmu_idx, void *retaddr)

{

    TranslationBlock *tb;

    CPUState *saved_env;

    unsigned long pc;

    int ret;

    /* XXX: hack to restore env in all cases, even if not called from

       generated code */

    saved_env = env;

    env = cpu_single_env;

    ret = cpu_sh4_handle_mmu_fault(env, addr, is_write, mmu_idx, 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;

}

#endif

void helper_ldtlb(void)

{

#ifdef CONFIG_USER_ONLY

    /* XXXXX */

    assert(0);

#else

    cpu_load_tlb(env);

#endif

}

void helper_raise_illegal_instruction(void)

{

    env->exception_index = 0x180;

    cpu_loop_exit();

}

void helper_raise_slot_illegal_instruction(void)

{

    env->exception_index = 0x1a0;

    cpu_loop_exit();

}

void helper_debug(void)

{

    env->exception_index = EXCP_DEBUG;

    cpu_loop_exit();

}

void helper_sleep(void)

{

    env->halted = 1;

    env->exception_index = EXCP_HLT;

    cpu_loop_exit();

}

void helper_trapa(uint32_t tra)

{

    env->tra = tra << 2;

    env->exception_index = 0x160;

    cpu_loop_exit();

}

uint32_t helper_addc(uint32_t arg0, uint32_t arg1)

{

    uint32_t tmp0, tmp1;

    tmp1 = arg0 + arg1;

    tmp0 = arg1;

    arg1 = tmp1 + (env->sr & 1);

    if (tmp0 > tmp1)

        env->sr |= SR_T;

    else

        env->sr &= ~SR_T;

    if (tmp1 > arg1)

        env->sr |= SR_T;

    return arg1;

}

uint32_t helper_addv(uint32_t arg0, uint32_t arg1)

{

    uint32_t dest, src, ans;

    if ((int32_t) arg1 >= 0)

        dest = 0;

    else

        dest = 1;

    if ((int32_t) arg0 >= 0)

        src = 0;

    else

        src = 1;

    src += dest;

    arg1 += arg0;

    if ((int32_t) arg1 >= 0)

        ans = 0;

    else

        ans = 1;

    ans += dest;

    if (src == 0 || src == 2) {

        if (ans == 1)

            env->sr |= SR_T;

        else

            env->sr &= ~SR_T;

    } else

        env->sr &= ~SR_T;

    return arg1;

}

#define T (env->sr & SR_T)

#define Q (env->sr & SR_Q ? 1 : 0)

#define M (env->sr & SR_M ? 1 : 0)

#define SETT env->sr |= SR_T

#define CLRT env->sr &= ~SR_T

#define SETQ env->sr |= SR_Q

#define CLRQ env->sr &= ~SR_Q

#define SETM env->sr |= SR_M

#define CLRM env->sr &= ~SR_M

uint32_t helper_div1(uint32_t arg0, uint32_t arg1)

{

    uint32_t tmp0, tmp2;

    uint8_t old_q, tmp1 = 0xff;

    //printf("div1 arg0=0x%08x arg1=0x%08x M=%d Q=%d T=%d\n", arg0, arg1, M, Q, T);

    old_q = Q;

    if ((0x80000000 & arg1) != 0)

        SETQ;

    else

        CLRQ;

    tmp2 = arg0;

    arg1 <<= 1;

    arg1 |= T;

    switch (old_q) {

    case 0:

        switch (M) {

        case 0:

            tmp0 = arg1;

            arg1 -= tmp2;

            tmp1 = arg1 > tmp0;

            switch (Q) {

            case 0:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        case 1:

            tmp0 = arg1;

            arg1 += tmp2;

            tmp1 = arg1 < tmp0;

            switch (Q) {

            case 0:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        }

        break;

    case 1:

        switch (M) {

        case 0:

            tmp0 = arg1;

            arg1 += tmp2;

            tmp1 = arg1 < tmp0;

            switch (Q) {

            case 0:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        case 1:

            tmp0 = arg1;

            arg1 -= tmp2;

            tmp1 = arg1 > tmp0;

            switch (Q) {

            case 0:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        }

        break;

    }

    if (Q == M)

        SETT;

    else

        CLRT;

    //printf("Output: arg1=0x%08x M=%d Q=%d T=%d\n", arg1, M, Q, T);

    return arg1;

}

void helper_macl(uint32_t arg0, uint32_t arg1)

{

    int64_t res;

    res = ((uint64_t) env->mach << 32) | env->macl;

    res += (int64_t) (int32_t) arg0 *(int64_t) (int32_t) arg1;

    env->mach = (res >> 32) & 0xffffffff;

    env->macl = res & 0xffffffff;

    if (env->sr & SR_S) {

        if (res < 0)

            env->mach |= 0xffff0000;

        else

            env->mach &= 0x00007fff;

    }

}

void helper_macw(uint32_t arg0, uint32_t arg1)

{

    int64_t res;

    res = ((uint64_t) env->mach << 32) | env->macl;

    res += (int64_t) (int16_t) arg0 *(int64_t) (int16_t) arg1;

    env->mach = (res >> 32) & 0xffffffff;

    env->macl = res & 0xffffffff;

    if (env->sr & SR_S) {

        if (res < -0x80000000) {

            env->mach = 1;

            env->macl = 0x80000000;

        } else if (res > 0x000000007fffffff) {

            env->mach = 1;

            env->macl = 0x7fffffff;

        }

    }

}

uint32_t helper_negc(uint32_t arg)

{

    uint32_t temp;

    temp = -arg;

    arg = temp - (env->sr & SR_T);

    if (0 < temp)

        env->sr |= SR_T;

    else

        env->sr &= ~SR_T;

    if (temp < arg)

        env->sr |= SR_T;

    return arg;

}

uint32_t helper_subc(uint32_t arg0, uint32_t arg1)

{

    uint32_t tmp0, tmp1;

    tmp1 = arg1 - arg0;

    tmp0 = arg1;

    arg1 = tmp1 - (env->sr & SR_T);

    if (tmp0 < tmp1)

        env->sr |= SR_T;

    else

        env->sr &= ~SR_T;

    if (tmp1 < arg1)

        env->sr |= SR_T;

    return arg1;

}

uint32_t helper_subv(uint32_t arg0, uint32_t arg1)

{

    int32_t dest, src, ans;

    if ((int32_t) arg1 >= 0)

        dest = 0;

    else

        dest = 1;

    if ((int32_t) arg0 >= 0)

        src = 0;

    else

        src = 1;

    src += dest;

    arg1 -= arg0;

    if ((int32_t) arg1 >= 0)

        ans = 0;

    else

        ans = 1;

    ans += dest;

    if (src == 1) {

        if (ans == 1)

            env->sr |= SR_T;

        else

            env->sr &= ~SR_T;

    } else

        env->sr &= ~SR_T;

    return arg1;

}

void helper_ld_fpscr(uint32_t val)

{

    env->fpscr = val & 0x003fffff;

    if (val & 0x01)

        set_float_rounding_mode(float_round_to_zero, &env->fp_status);

    else

        set_float_rounding_mode(float_round_nearest_even, &env->fp_status);

}