/*

 *  MIPS emulation helpers for qemu.

 *

 *  Copyright (c) 2004-2005 Jocelyn Mayer

 *

 * 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 <stdlib.h>

#include "exec.h"

#include "host-utils.h"

#include "helper.h"

/*****************************************************************************/

/* Exceptions processing helpers */

void do_raise_exception_err (uint32_t exception, int error_code)

{

#if 1

    if (logfile && exception < 0x100)

        fprintf(logfile, "%s: %d %d\n", __func__, exception, error_code);

#endif

    env->exception_index = exception;

    env->error_code = error_code;

    cpu_loop_exit();

}

void do_raise_exception (uint32_t exception)

{

    do_raise_exception_err(exception, 0);

}

void do_interrupt_restart (void)

{

    if (!(env->CP0_Status & (1 << CP0St_EXL)) &&

        !(env->CP0_Status & (1 << CP0St_ERL)) &&

        !(env->hflags & MIPS_HFLAG_DM) &&

        (env->CP0_Status & (1 << CP0St_IE)) &&

        (env->CP0_Status & env->CP0_Cause & CP0Ca_IP_mask)) {

        env->CP0_Cause &= ~(0x1f << CP0Ca_EC);

        do_raise_exception(EXCP_EXT_INTERRUPT);

    }

}

#if !defined(CONFIG_USER_ONLY)

static void do_restore_state (void *pc_ptr)

{

    TranslationBlock *tb;

    unsigned long pc = (unsigned long) pc_ptr;

    tb = tb_find_pc (pc);

    if (tb) {

        cpu_restore_state (tb, env, pc, NULL);

    }

}

#endif

target_ulong do_clo (target_ulong t0)

{

    return clo32(t0);

}

target_ulong do_clz (target_ulong t0)

{

    return clz32(t0);

}

#if defined(TARGET_MIPS64)

target_ulong do_dclo (target_ulong t0)

{

    return clo64(t0);

}

target_ulong do_dclz (target_ulong t0)

{

    return clz64(t0);

}

#endif /* TARGET_MIPS64 */

/* 64 bits arithmetic for 32 bits hosts */

static inline uint64_t get_HILO (void)

{

    return ((uint64_t)(env->active_tc.HI[0]) << 32) | (uint32_t)env->active_tc.LO[0];

}

static inline void set_HILO (uint64_t HILO)

{

    env->active_tc.LO[0] = (int32_t)HILO;

    env->active_tc.HI[0] = (int32_t)(HILO >> 32);

}

static inline void set_HIT0_LO (target_ulong t0, uint64_t HILO)

{

    env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);

    t0 = env->active_tc.HI[0] = (int32_t)(HILO >> 32);

}

static inline void set_HI_LOT0 (target_ulong t0, uint64_t HILO)

{

    t0 = env->active_tc.LO[0] = (int32_t)(HILO & 0xFFFFFFFF);

    env->active_tc.HI[0] = (int32_t)(HILO >> 32);

}

#if TARGET_LONG_BITS > HOST_LONG_BITS

void do_madd (target_ulong t0, target_ulong t1)

{

    int64_t tmp;

    tmp = ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1);

    set_HILO((int64_t)get_HILO() + tmp);

}

void do_maddu (target_ulong t0, target_ulong t1)

{

    uint64_t tmp;

    tmp = ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1);

    set_HILO(get_HILO() + tmp);

}

void do_msub (target_ulong t0, target_ulong t1)

{

    int64_t tmp;

    tmp = ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1);

    set_HILO((int64_t)get_HILO() - tmp);

}

void do_msubu (target_ulong t0, target_ulong t1)

{

    uint64_t tmp;

    tmp = ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1);

    set_HILO(get_HILO() - tmp);

}

#endif /* TARGET_LONG_BITS > HOST_LONG_BITS */

/* Multiplication variants of the vr54xx. */

target_ulong do_muls (target_ulong t0, target_ulong t1)

{

    set_HI_LOT0(t0, 0 - ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1));

    return t0;

}

target_ulong do_mulsu (target_ulong t0, target_ulong t1)

{

    set_HI_LOT0(t0, 0 - ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1));

    return t0;

}

target_ulong do_macc (target_ulong t0, target_ulong t1)

{

    set_HI_LOT0(t0, ((int64_t)get_HILO()) + ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1));

    return t0;

}

target_ulong do_macchi (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, ((int64_t)get_HILO()) + ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1));

    return t0;

}

target_ulong do_maccu (target_ulong t0, target_ulong t1)

{

    set_HI_LOT0(t0, ((uint64_t)get_HILO()) + ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1));

    return t0;

}

target_ulong do_macchiu (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, ((uint64_t)get_HILO()) + ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1));

    return t0;

}

target_ulong do_msac (target_ulong t0, target_ulong t1)

{

    set_HI_LOT0(t0, ((int64_t)get_HILO()) - ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1));

    return t0;

}

target_ulong do_msachi (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, ((int64_t)get_HILO()) - ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1));

    return t0;

}

target_ulong do_msacu (target_ulong t0, target_ulong t1)

{

    set_HI_LOT0(t0, ((uint64_t)get_HILO()) - ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1));

    return t0;

}

target_ulong do_msachiu (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, ((uint64_t)get_HILO()) - ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1));

    return t0;

}

target_ulong do_mulhi (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, (int64_t)(int32_t)t0 * (int64_t)(int32_t)t1);

    return t0;

}

target_ulong do_mulhiu (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, (uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1);

    return t0;

}

target_ulong do_mulshi (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, 0 - ((int64_t)(int32_t)t0 * (int64_t)(int32_t)t1));

    return t0;

}

target_ulong do_mulshiu (target_ulong t0, target_ulong t1)

{

    set_HIT0_LO(t0, 0 - ((uint64_t)(uint32_t)t0 * (uint64_t)(uint32_t)t1));

    return t0;

}

#ifdef TARGET_MIPS64

void do_dmult (target_ulong t0, target_ulong t1)

{

    muls64(&(env->active_tc.LO[0]), &(env->active_tc.HI[0]), t0, t1);

}

void do_dmultu (target_ulong t0, target_ulong t1)

{

    mulu64(&(env->active_tc.LO[0]), &(env->active_tc.HI[0]), t0, t1);

}

#endif

#ifdef TARGET_WORDS_BIGENDIAN

#define GET_LMASK(v) ((v) & 3)

#define GET_OFFSET(addr, offset) (addr + (offset))

#else

#define GET_LMASK(v) (((v) & 3) ^ 3)

#define GET_OFFSET(addr, offset) (addr - (offset))

#endif

target_ulong do_lwl(target_ulong t0, target_ulong t1, int mem_idx)

{

    target_ulong tmp;

#ifdef CONFIG_USER_ONLY

#define ldfun ldub_raw

#else

    int (*ldfun)(target_ulong);

    switch (mem_idx)

    {

    case 0: ldfun = ldub_kernel; break;

    case 1: ldfun = ldub_super; break;

    default:

    case 2: ldfun = ldub_user; break;

    }

#endif

    tmp = ldfun(t0);

    t1 = (t1 & 0x00FFFFFF) | (tmp << 24);

    if (GET_LMASK(t0) <= 2) {

        tmp = ldfun(GET_OFFSET(t0, 1));

        t1 = (t1 & 0xFF00FFFF) | (tmp << 16);

    }

    if (GET_LMASK(t0) <= 1) {

        tmp = ldfun(GET_OFFSET(t0, 2));

        t1 = (t1 & 0xFFFF00FF) | (tmp << 8);

    }

    if (GET_LMASK(t0) == 0) {

        tmp = ldfun(GET_OFFSET(t0, 3));

        t1 = (t1 & 0xFFFFFF00) | tmp;

    }

    return (int32_t)t1;

}

target_ulong do_lwr(target_ulong t0, target_ulong t1, int mem_idx)

{

    target_ulong tmp;

#ifdef CONFIG_USER_ONLY

#define ldfun ldub_raw

#else

    int (*ldfun)(target_ulong);

    switch (mem_idx)

    {

    case 0: ldfun = ldub_kernel; break;

    case 1: ldfun = ldub_super; break;

    default:

    case 2: ldfun = ldub_user; break;

    }

#endif

    tmp = ldfun(t0);

    t1 = (t1 & 0xFFFFFF00) | tmp;

    if (GET_LMASK(t0) >= 1) {

        tmp = ldfun(GET_OFFSET(t0, -1));

        t1 = (t1 & 0xFFFF00FF) | (tmp << 8);

    }

    if (GET_LMASK(t0) >= 2) {

        tmp = ldfun(GET_OFFSET(t0, -2));

        t1 = (t1 & 0xFF00FFFF) | (tmp << 16);

    }

    if (GET_LMASK(t0) == 3) {

        tmp = ldfun(GET_OFFSET(t0, -3));

        t1 = (t1 & 0x00FFFFFF) | (tmp << 24);

    }

    return (int32_t)t1;

}

void do_swl(target_ulong t0, target_ulong t1, int mem_idx)

{

#ifdef CONFIG_USER_ONLY

#define stfun stb_raw

#else

    void (*stfun)(target_ulong, int);

    switch (mem_idx)

    {

    case 0: stfun = stb_kernel; break;

    case 1: stfun = stb_super; break;

    default:

    case 2: stfun = stb_user; break;

    }

#endif

    stfun(t0, (uint8_t)(t1 >> 24));

    if (GET_LMASK(t0) <= 2)

        stfun(GET_OFFSET(t0, 1), (uint8_t)(t1 >> 16));

    if (GET_LMASK(t0) <= 1)

        stfun(GET_OFFSET(t0, 2), (uint8_t)(t1 >> 8));

    if (GET_LMASK(t0) == 0)

        stfun(GET_OFFSET(t0, 3), (uint8_t)t1);

}

void do_swr(target_ulong t0, target_ulong t1, int mem_idx)

{

#ifdef CONFIG_USER_ONLY

#define stfun stb_raw

#else

    void (*stfun)(target_ulong, int);

    switch (mem_idx)

    {

    case 0: stfun = stb_kernel; break;

    case 1: stfun = stb_super; break;

    default:

    case 2: stfun = stb_user; break;

    }

#endif

    stfun(t0, (uint8_t)t1);

    if (GET_LMASK(t0) >= 1)

        stfun(GET_OFFSET(t0, -1), (uint8_t)(t1 >> 8));

    if (GET_LMASK(t0) >= 2)

        stfun(GET_OFFSET(t0, -2), (uint8_t)(t1 >> 16));

    if (GET_LMASK(t0) == 3)

        stfun(GET_OFFSET(t0, -3), (uint8_t)(t1 >> 24));

}

#if defined(TARGET_MIPS64)

/* "half" load and stores.  We must do the memory access inline,

   or fault handling won't work.  */

#ifdef TARGET_WORDS_BIGENDIAN

#define GET_LMASK64(v) ((v) & 7)

#else

#define GET_LMASK64(v) (((v) & 7) ^ 7)

#endif

target_ulong do_ldl(target_ulong t0, target_ulong t1, int mem_idx)

{

    uint64_t tmp;

#ifdef CONFIG_USER_ONLY

#define ldfun ldub_raw

#else

    int (*ldfun)(target_ulong);

    switch (mem_idx)

    {

    case 0: ldfun = ldub_kernel; break;

    case 1: ldfun = ldub_super; break;

    default:

    case 2: ldfun = ldub_user; break;

    }

#endif

    tmp = ldfun(t0);

    t1 = (t1 & 0x00FFFFFFFFFFFFFFULL) | (tmp << 56);

    if (GET_LMASK64(t0) <= 6) {

        tmp = ldfun(GET_OFFSET(t0, 1));

        t1 = (t1 & 0xFF00FFFFFFFFFFFFULL) | (tmp << 48);

    }

    if (GET_LMASK64(t0) <= 5) {

        tmp = ldfun(GET_OFFSET(t0, 2));

        t1 = (t1 & 0xFFFF00FFFFFFFFFFULL) | (tmp << 40);

    }

    if (GET_LMASK64(t0) <= 4) {

        tmp = ldfun(GET_OFFSET(t0, 3));

        t1 = (t1 & 0xFFFFFF00FFFFFFFFULL) | (tmp << 32);

    }

    if (GET_LMASK64(t0) <= 3) {

        tmp = ldfun(GET_OFFSET(t0, 4));

        t1 = (t1 & 0xFFFFFFFF00FFFFFFULL) | (tmp << 24);

    }

    if (GET_LMASK64(t0) <= 2) {

        tmp = ldfun(GET_OFFSET(t0, 5));

        t1 = (t1 & 0xFFFFFFFFFF00FFFFULL) | (tmp << 16);

    }

    if (GET_LMASK64(t0) <= 1) {

        tmp = ldfun(GET_OFFSET(t0, 6));

        t1 = (t1 & 0xFFFFFFFFFFFF00FFULL) | (tmp << 8);

    }

    if (GET_LMASK64(t0) == 0) {

        tmp = ldfun(GET_OFFSET(t0, 7));

        t1 = (t1 & 0xFFFFFFFFFFFFFF00ULL) | tmp;

    }

    return t1;

}

target_ulong do_ldr(target_ulong t0, target_ulong t1, int mem_idx)

{

    uint64_t tmp;

#ifdef CONFIG_USER_ONLY

#define ldfun ldub_raw

#else

    int (*ldfun)(target_ulong);

    switch (mem_idx)

    {

    case 0: ldfun = ldub_kernel; break;

    case 1: ldfun = ldub_super; break;

    default:

    case 2: ldfun = ldub_user; break;

    }

#endif

    tmp = ldfun(t0);

    t1 = (t1 & 0xFFFFFFFFFFFFFF00ULL) | tmp;

    if (GET_LMASK64(t0) >= 1) {

        tmp = ldfun(GET_OFFSET(t0, -1));

        t1 = (t1 & 0xFFFFFFFFFFFF00FFULL) | (tmp  << 8);

    }

    if (GET_LMASK64(t0) >= 2) {

        tmp = ldfun(GET_OFFSET(t0, -2));

        t1 = (t1 & 0xFFFFFFFFFF00FFFFULL) | (tmp << 16);

    }

    if (GET_LMASK64(t0) >= 3) {

        tmp = ldfun(GET_OFFSET(t0, -3));

        t1 = (t1 & 0xFFFFFFFF00FFFFFFULL) | (tmp << 24);

    }

    if (GET_LMASK64(t0) >= 4) {

        tmp = ldfun(GET_OFFSET(t0, -4));

        t1 = (t1 & 0xFFFFFF00FFFFFFFFULL) | (tmp << 32);

    }

    if (GET_LMASK64(t0) >= 5) {

        tmp = ldfun(GET_OFFSET(t0, -5));

        t1 = (t1 & 0xFFFF00FFFFFFFFFFULL) | (tmp << 40);

    }

    if (GET_LMASK64(t0) >= 6) {

        tmp = ldfun(GET_OFFSET(t0, -6));

        t1 = (t1 & 0xFF00FFFFFFFFFFFFULL) | (tmp << 48);

    }

    if (GET_LMASK64(t0) == 7) {

        tmp = ldfun(GET_OFFSET(t0, -7));

        t1 = (t1 & 0x00FFFFFFFFFFFFFFULL) | (tmp << 56);

    }

    return t1;

}

void do_sdl(target_ulong t0, target_ulong t1, int mem_idx)

{

#ifdef CONFIG_USER_ONLY

#define stfun stb_raw

#else

    void (*stfun)(target_ulong, int);