/*
 *  PPC emulation helpers for qemu.
 * 
 *  Copyright (c) 2003 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 <math.h>
#include "exec.h"

#define MEMSUFFIX _raw
#include "op_helper_mem.h"
#if !defined(CONFIG_USER_ONLY)
#define MEMSUFFIX _user
#include "op_helper_mem.h"
#define MEMSUFFIX _kernel
#include "op_helper_mem.h"
#endif

/*****************************************************************************/
/* Exceptions processing helpers */
void cpu_loop_exit(void)
{
    longjmp(env->jmp_env, 1);
}

void do_raise_exception_err (uint32_t exception, int error_code)
{
#if 0
    printf("Raise exception %3x code : %d\n", exception, error_code);
#endif
    switch (exception) {
    case EXCP_EXTERNAL:
    case EXCP_DECR:
	printf("DECREMENTER & EXTERNAL exceptions should be hard interrupts !\n");
	if (msr_ee == 0)
	    return;
	break;
    case EXCP_PROGRAM:
	if (error_code == EXCP_FP && msr_fe0 == 0 && msr_fe1 == 0)
	    return;
	break;
    default:
	break;
}
    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);
}

/*****************************************************************************/
/* Helpers for "fat" micro operations */
/* Special registers load and store */
void do_load_cr (void)
{
    T0 = (env->crf[0] << 28) |
        (env->crf[1] << 24) |
        (env->crf[2] << 20) |
        (env->crf[3] << 16) |
        (env->crf[4] << 12) |
        (env->crf[5] << 8) |
        (env->crf[6] << 4) |
        (env->crf[7] << 0);
}

void do_store_cr (uint32_t mask)
{
    int i, sh;

    for (i = 0, sh = 7; i < 8; i++, sh --) {
        if (mask & (1 << sh))
            env->crf[i] = (T0 >> (sh * 4)) & 0xF;
    }
}

void do_load_xer (void)
{
    T0 = (xer_so << XER_SO) |
        (xer_ov << XER_OV) |
        (xer_ca << XER_CA) |
        (xer_bc << XER_BC);
}

void do_store_xer (void)
{
    xer_so = (T0 >> XER_SO) & 0x01;
    xer_ov = (T0 >> XER_OV) & 0x01;
    xer_ca = (T0 >> XER_CA) & 0x01;
    xer_bc = (T0 >> XER_BC) & 0x1f;
}

void do_load_msr (void)
{
    T0 = (msr_pow << MSR_POW) |
        (msr_ile << MSR_ILE) |
        (msr_ee << MSR_EE) |
        (msr_pr << MSR_PR) |
        (msr_fp << MSR_FP) |
        (msr_me << MSR_ME) |
        (msr_fe0 << MSR_FE0) |
        (msr_se << MSR_SE) |
        (msr_be << MSR_BE) |
        (msr_fe1 << MSR_FE1) |
        (msr_ip << MSR_IP) |
        (msr_ir << MSR_IR) |
        (msr_dr << MSR_DR) |
        (msr_ri << MSR_RI) |
        (msr_le << MSR_LE);
}

void do_store_msr (void)
{
#if 1 // TRY
    if (((T0 >> MSR_IR) & 0x01) != msr_ir ||
        ((T0 >> MSR_DR) & 0x01) != msr_dr ||
        ((T0 >> MSR_PR) & 0x01) != msr_pr)
    {
        do_tlbia();
    }
#endif
    msr_pow = (T0 >> MSR_POW) & 0x03;
    msr_ile = (T0 >> MSR_ILE) & 0x01;
    msr_ee = (T0 >> MSR_EE) & 0x01;
    msr_pr = (T0 >> MSR_PR) & 0x01;
    msr_fp = (T0 >> MSR_FP) & 0x01;
    msr_me = (T0 >> MSR_ME) & 0x01;
    msr_fe0 = (T0 >> MSR_FE0) & 0x01;
    msr_se = (T0 >> MSR_SE) & 0x01;
    msr_be = (T0 >> MSR_BE) & 0x01;
    msr_fe1 = (T0 >> MSR_FE1) & 0x01;
    msr_ip = (T0 >> MSR_IP) & 0x01;
    msr_ir = (T0 >> MSR_IR) & 0x01;
    msr_dr = (T0 >> MSR_DR) & 0x01;
    msr_ri = (T0 >> MSR_RI) & 0x01;
    msr_le = (T0 >> MSR_LE) & 0x01;
}

/* shift right arithmetic helper */
void do_sraw (void)
{
    int32_t ret;

    xer_ca = 0;
    if (T1 & 0x20) {
        ret = (-1) * (T0 >> 31);
        if (ret < 0 && (T0 & ~0x80000000) != 0)
            xer_ca = 1;
#if 1 // TRY
    } else if (T1 == 0) {
        ret = T0;
#endif
    } else {
        ret = (int32_t)T0 >> (T1 & 0x1f);
        if (ret < 0 && ((int32_t)T0 & ((1 << T1) - 1)) != 0)
            xer_ca = 1;
    }
    T0 = ret;
}

/* Floating point operations helpers */
void do_load_fpscr (void)
{
    /* The 32 MSB of the target fpr are undefined.
     * They'll be zero...
     */
    union {
        double d;
        struct {
            uint32_t u[2];
        } s;
    } u;
    int i;

#ifdef WORDS_BIGENDIAN
#define WORD0 0
#define WORD1 1
#else
#define WORD0 1
#define WORD1 0
#endif
    u.s.u[WORD0] = 0;
    u.s.u[WORD1] = 0;
    for (i = 0; i < 8; i++)
        u.s.u[WORD1] |= env->fpscr[i] << (4 * i);
    FT0 = u.d;
}

void do_store_fpscr (uint32_t mask)
{
    /*
     * We use only the 32 LSB of the incoming fpr
     */
    union {
        double d;
        struct {
            uint32_t u[2];
        } s;
    } u;
    int i, rnd_type;

    u.d = FT0;
    if (mask & 0x80)
        env->fpscr[0] = (env->fpscr[0] & 0x9) | ((u.s.u[WORD1] >> 28) & ~0x9);
    for (i = 1; i < 7; i++) {
        if (mask & (1 << (7 - i)))
            env->fpscr[i] = (u.s.u[WORD1] >> (4 * (7 - i))) & 0xF;
    }
    /* TODO: update FEX & VX */
    /* Set rounding mode */
    switch (env->fpscr[0] & 0x3) {
    case 0:
        /* Best approximation (round to nearest) */
        rnd_type = float_round_nearest_even;
        break;
    case 1:
        /* Smaller magnitude (round toward zero) */
        rnd_type = float_round_to_zero;
        break;
    case 2:
        /* Round toward +infinite */
        rnd_type = float_round_up;
        break;
    default:
    case 3:
        /* Round toward -infinite */
        rnd_type = float_round_down;
        break;
    }
    set_float_rounding_mode(rnd_type, &env->fp_status);
}

void do_fctiw (void)
{
    union {
        double d;
        uint64_t i;
    } p;

    /* XXX: higher bits are not supposed to be significant.
     *      to make tests easier, return the same as a real PPC 750 (aka G3)
     */
    p.i = float64_to_int32(FT0, &env->fp_status);
    p.i |= 0xFFF80000ULL << 32;
    FT0 = p.d;
}

void do_fctiwz (void)
{
    union {
        double d;
        uint64_t i;
    } p;

    /* XXX: higher bits are not supposed to be significant.
     *      to make tests easier, return the same as a real PPC 750 (aka G3)
     */
    p.i = float64_to_int32_round_to_zero(FT0, &env->fp_status);
    p.i |= 0xFFF80000ULL << 32;
    FT0 = p.d;
}

void do_fnmadd (void)
{
    FT0 = (FT0 * FT1) + FT2;
    if (!isnan(FT0))
        FT0 = -FT0;
}

void do_fnmsub (void)
{
    FT0 = (FT0 * FT1) - FT2;
    if (!isnan(FT0))
        FT0 = -FT0;
}

void do_fdiv (void)
{
    if (FT0 == -0.0 && FT1 == -0.0)
        FT0 = 0.0 / 0.0;
    else
        FT0 /= FT1;
}

void do_fsqrt (void)
{
    FT0 = sqrt(FT0);
}

void do_fres (void)
{
    union {
        double d;
        uint64_t i;
    } p;

    if (isnormal(FT0)) {
        FT0 = (float)(1.0 / FT0);
    } else {
        p.d = FT0;
        if (p.i == 0x8000000000000000ULL) {
            p.i = 0xFFF0000000000000ULL;
        } else if (p.i == 0x0000000000000000ULL) {
            p.i = 0x7FF0000000000000ULL;
        } else if (isnan(FT0)) {
            p.i = 0x7FF8000000000000ULL;
        } else if (FT0 < 0.0) {
            p.i = 0x8000000000000000ULL;
        } else {
            p.i = 0x0000000000000000ULL;
        }
        FT0 = p.d;
    }
}

void do_frsqrte (void)
{
    union {
        double d;
        uint64_t i;
    } p;

    if (isnormal(FT0) && FT0 > 0.0) {
        FT0 = (float)(1.0 / sqrt(FT0));
    } else {
        p.d = FT0;
        if (p.i == 0x8000000000000000ULL) {
            p.i = 0xFFF0000000000000ULL;
        } else if (p.i == 0x0000000000000000ULL) {
            p.i = 0x7FF0000000000000ULL;
        } else if (isnan(FT0)) {
            if (!(p.i & 0x0008000000000000ULL))
                p.i |= 0x000FFFFFFFFFFFFFULL;
        } else if (FT0 < 0) {
            p.i = 0x7FF8000000000000ULL;
        } else {
            p.i = 0x0000000000000000ULL;
        }
        FT0 = p.d;
    }
}

void do_fsel (void)
{
    if (FT0 >= 0)
        FT0 = FT1;
    else
        FT0 = FT2;
}

void do_fcmpu (void)
{
    if (isnan(FT0) || isnan(FT1)) {
        T0 = 0x01;
        env->fpscr[4] |= 0x1;
        env->fpscr[6] |= 0x1;
    } else if (FT0 < FT1) {
        T0 = 0x08;
    } else if (FT0 > FT1) {
        T0 = 0x04;
    } else {
        T0 = 0x02;
    }
    env->fpscr[3] = T0;
}

void do_fcmpo (void)
{
    env->fpscr[4] &= ~0x1;
    if (isnan(FT0) || isnan(FT1)) {
        T0 = 0x01;
        env->fpscr[4] |= 0x1;
        /* I don't know how to test "quiet" nan... */
        if (0 /* || ! quiet_nan(...) */) {
            env->fpscr[6] |= 0x1;
            if (!(env->fpscr[1] & 0x8))
                env->fpscr[4] |= 0x8;
        } else {
            env->fpscr[4] |= 0x8;
        }
    } else if (FT0 < FT1) {
        T0 = 0x08;
    } else if (FT0 > FT1) {
        T0 = 0x04;
    } else {
        T0 = 0x02;
    }
    env->fpscr[3] = T0;
}

void do_fabs (void)
{
    union {
        double d;
        uint64_t i;
    } p;

    p.d = FT0;
    p.i &= ~0x8000000000000000ULL;
    FT0 = p.d;
}

void do_fnabs (void)
{
    union {
        double d;
        uint64_t i;
    } p;

    p.d = FT0;
    p.i |= 0x8000000000000000ULL;
    FT0 = p.d;
}

/* Instruction cache invalidation helper */
#define ICACHE_LINE_SIZE 32

void do_check_reservation (void)
{
    if ((env->reserve & ~0x03) == T0)
        env->reserve = -1;
}

void do_icbi (void)
{
    /* Invalidate one cache line */
    T0 &= ~(ICACHE_LINE_SIZE - 1);
    tb_invalidate_page_range(T0, T0 + ICACHE_LINE_SIZE);
}

/* TLB invalidation helpers */
void do_tlbia (void)
{
    tlb_flush(env, 1);
}

void do_tlbie (void)
{
    tlb_flush_page(env, T0);
}

void do_store_sr (uint32_t srnum)
{
#if defined (DEBUG_OP)
    dump_store_sr(srnum);
#endif
#if 0 // TRY
    {
        uint32_t base, page;
        
        base = srnum << 28;
        for (page = base; page != base + 0x100000000; page += 0x1000)
            tlb_flush_page(env, page);
    }
#else
    tlb_flush(env, 1);
#endif
    env->sr[srnum] = T0;
}

/* For BATs, we may not invalidate any TLBs if the change is only on
 * protection bits for user mode.
 */
void do_store_ibat (int ul, int nr)
{
#if defined (DEBUG_OP)
    dump_store_ibat(ul, nr);
#endif
#if 0 // TRY
    {
        uint32_t base, length, page;

        base = env->IBAT[0][nr];
        length = (((base >> 2) & 0x000007FF) + 1) << 17;
        base &= 0xFFFC0000;
        for (page = base; page != base + length; page += 0x1000)
            tlb_flush_page(env, page);
    }
#else
    tlb_flush(env, 1);
#endif
    env->IBAT[ul][nr] = T0;
}

void do_store_dbat (int ul, int nr)
{
#if defined (DEBUG_OP)
    dump_store_dbat(ul, nr);
#endif
#if 0 // TRY
    {
        uint32_t base, length, page;
        base = env->DBAT[0][nr];
        length = (((base >> 2) & 0x000007FF) + 1) << 17;
        base &= 0xFFFC0000;
        for (page = base; page != base + length; page += 0x1000)
            tlb_flush_page(env, page);
    }
#else
    tlb_flush(env, 1);
#endif
    env->DBAT[ul][nr] = T0;
}

/*****************************************************************************/
/* Special helpers for debug */
void dump_state (void)
{
    //    cpu_dump_state(env, stdout, fprintf, 0);
}

void dump_rfi (void)
{
#if 0
    printf("Return from interrupt => 0x%08x\n", env->nip);
    //    cpu_dump_state(env, stdout, fprintf, 0);
#endif
}

void dump_store_sr (int srnum)
{
#if 0
    printf("%s: reg=%d 0x%08x\n", __func__, srnum, T0);
#endif
}

static void _dump_store_bat (char ID, int ul, int nr)
{
    printf("Set %cBAT%d%c to 0x%08x (0x%08x)\n",
           ID, nr, ul == 0 ? 'u' : 'l', T0, env->nip);
}

void dump_store_ibat (int ul, int nr)
{
    _dump_store_bat('I', ul, nr);
}

void dump_store_dbat (int ul, int nr)
{
    _dump_store_bat('D', ul, nr);
}

void dump_store_tb (int ul)
{
    printf("Set TB%c to 0x%08x\n", ul == 0 ? 'L' : 'U', T0);
}

void dump_update_tb(uint32_t param)
{
#if 0
    printf("Update TB: 0x%08x + %d => 0x%08x\n", T1, param, T0);
#endif
}