Archipelago » qemu

/*

 *  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"

#if defined(CONFIG_USER_ONLY)

#define MEMSUFFIX _raw

#include "op_helper_mem.h"

#else

#define MEMSUFFIX _user

#include "op_helper_mem.h"

#define MEMSUFFIX _kernel

#include "op_helper_mem.h"

#endif

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

/* Exceptions processing helpers */

void do_queue_exception_err (uint32_t exception, int error_code)

{

    /* Queue real PPC exceptions */

    if (exception < EXCP_PPC_MAX) {

        env->exceptions |= 1 << exception;

        env->errors[exception] = error_code;

    } else {

        /* Preserve compatibility with qemu core */

        env->exceptions |= 1;

        env->exception_index = exception;

        env->error_code = error_code;

    }

}

void do_queue_exception (uint32_t exception)

{

    do_queue_exception_err(exception, 0);

}

void do_check_exception_state (void)

{

    if ((env->exceptions & 1) == 1 || check_exception_state(env)) {

        env->exceptions &= ~1;

        cpu_loop_exit();

    }

}

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

/* 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 (((T0 >> MSR_IR) & 0x01) != msr_ir ||

        ((T0 >> MSR_DR) & 0x01) != msr_dr ||

        ((T0 >> MSR_PR) & 0x01) != msr_pr) {

        /* Flush all tlb when changing translation mode or privilege level */

        do_tlbia();

    }

#if 0

    if ((T0 >> MSR_IP) & 0x01) {

        printf("Halting CPU. Stop emulation\n");

        do_queue_exception(EXCP_HLT);

        cpu_loop_exit();

    }

#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)

            xer_ca = 1;

    } else {

        ret = (int32_t)T0 >> (T1 & 0x1f);

        if (ret < 0 && ((int32_t)T0 & ((1 << T1) - 1)) != 0)

            xer_ca = 1;

    }

    (int32_t)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;

    u.s.u[0] = 0;

    u.s.u[1] = 0;

    for (i = 0; i < 8; i++)

        u.s.u[1] |= 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;

    u.d = FT0;

    if (mask & 0x80)

        env->fpscr[0] = (env->fpscr[0] & 0x9) | ((u.s.u[1] >> 28) & ~0x9);

    for (i = 1; i < 7; i++) {

        if (mask & (1 << (7 - i)))

            env->fpscr[i] = (u.s.u[1] >> (4 * (7 - i))) & 0xF;

    }

    /* TODO: update FEX & VX */

    /* Set rounding mode */

    switch (env->fpscr[0] & 0x3) {

    case 0:

        /* Best approximation (round to nearest) */

        fesetround(FE_TONEAREST);

        break;

    case 1:

        /* Smaller magnitude (round toward zero) */

        fesetround(FE_TOWARDZERO);

        break;

    case 2:

        /* Round toward +infinite */

        fesetround(FE_UPWARD);

        break;

    case 3:

        /* Round toward -infinite */

        fesetround(FE_DOWNWARD);

        break;

    }

}

void do_fctiw (void)

{

    union {

        double d;

        uint64_t i;

    } *p = (void *)&FT1;

    if (FT0 > (double)0x7FFFFFFF)

        p->i = 0x7FFFFFFFULL << 32;

    else if (FT0 < -(double)0x80000000)

        p->i = 0x80000000ULL << 32;

    else

        p->i = 0;

    p->i |= (uint32_t)FT0;

    FT0 = p->d;

}

void do_fctiwz (void)

{

    union {

        double d;

        uint64_t i;

    } *p = (void *)&FT1;

    int cround = fegetround();

    fesetround(FE_TOWARDZERO);

    if (FT0 > (double)0x7FFFFFFF)

        p->i = 0x7FFFFFFFULL << 32;

    else if (FT0 < -(double)0x80000000)

        p->i = 0x80000000ULL << 32;

    else

        p->i = 0;

    p->i |= (uint32_t)FT0;

    FT0 = p->d;

    fesetround(cround);

}

void do_fsqrt (void)

{

    FT0 = sqrt(FT0);

}

void do_fsqrts (void)

{

    FT0 = (float)sqrt((float)FT0);

}

void do_fres (void)

{

    FT0 = 1.0 / FT0;

}

void do_fsqrte (void)

{

    FT0 = 1.0 / sqrt(FT0);

}

void do_fsel (void)

{

    if (FT0 >= 0)

        FT0 = FT2;

    else

        FT0 = FT1;

}

void do_fcmpu (void)

{

    env->fpscr[4] &= ~0x1;

    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)

{

    FT0 = fabsl(FT0);

}

void do_fnabs (void)

{

    FT0 = -fabsl(FT0);

}

/* Instruction cache invalidation helper */

#define ICACHE_LINE_SIZE 32

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);

}

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

/* Special helpers for debug */

void dump_rfi (void)

{

#if 0

    printf("Return from interrupt\n");

    printf("nip=0x%08x LR=0x%08x CTR=0x%08x MSR=0x%08x\n",

           env->nip, env->lr, env->ctr,

           (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));

    {

        int  i;

        for (i = 0; i < 32; i++) {

            if ((i & 7) == 0)

                printf("GPR%02d:", i);

            printf(" %08x", env->gpr[i]);

            if ((i & 7) == 7)

                printf("\n");

        }

        printf("CR: 0x");

        for (i = 0; i < 8; i++)

            printf("%01x", env->crf[i]);

        printf("  [");

        for (i = 0; i < 8; i++) {

            char a = '-';

            if (env->crf[i] & 0x08)

                a = 'L';

            else if (env->crf[i] & 0x04)

                a = 'G';

            else if (env->crf[i] & 0x02)

                a = 'E';

            printf(" %c%c", a, env->crf[i] & 0x01 ? 'O' : ' ');

        }

        printf(" ] ");

    }

    printf("TB: 0x%08x %08x\n", env->tb[1], env->tb[0]);

    printf("SRR0 0x%08x SRR1 0x%08x\n", env->spr[SRR0], env->spr[SRR1]);

#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

}