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 "exec.h"

extern FILE *logfile;

void cpu_loop_exit(void)

{

    longjmp(env->jmp_env, 1);

}

/* shortcuts to generate exceptions */

void raise_exception_err (int exception_index, int error_code)

{

    env->exception_index = exception_index;

    env->error_code = error_code;

    cpu_loop_exit();

}

void raise_exception (int exception_index)

{

    env->exception_index = exception_index;

    env->error_code = 0;

    cpu_loop_exit();

}

/* Helpers for "fat" micro operations */

uint32_t do_load_cr (void)

{

    return (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 crn, uint32_t value)

{

    int i, sh;

    for (i = 0, sh = 7; i < 8; i++, sh --) {

        if (crn & (1 << sh))

            env->crf[i] = (value >> (sh * 4)) & 0xF;

    }

}

uint32_t do_load_xer (void)

{

    return (xer_so << XER_SO) |

        (xer_ov << XER_OV) |

        (xer_ca << XER_CA) |

        (xer_bc << XER_BC);

}

void do_store_xer (uint32_t value)

{

    xer_so = (value >> XER_SO) & 0x01;

    xer_ov = (value >> XER_OV) & 0x01;

    xer_ca = (value >> XER_CA) & 0x01;

    xer_bc = (value >> XER_BC) & 0x1f;

}

uint32_t do_load_msr (void)

{

    return (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 (uint32_t msr_value)

{

    msr_pow = (msr_value >> MSR_POW) & 0x03;

    msr_ile = (msr_value >> MSR_ILE) & 0x01;

    msr_ee = (msr_value >> MSR_EE) & 0x01;

    msr_pr = (msr_value >> MSR_PR) & 0x01;

    msr_fp = (msr_value >> MSR_FP) & 0x01;

    msr_me = (msr_value >> MSR_ME) & 0x01;

    msr_fe0 = (msr_value >> MSR_FE0) & 0x01;

    msr_se = (msr_value >> MSR_SE) & 0x01;

    msr_be = (msr_value >> MSR_BE) & 0x01;

    msr_fe1 = (msr_value >> MSR_FE1) & 0x01;

    msr_ip = (msr_value >> MSR_IP) & 0x01;

    msr_ir = (msr_value >> MSR_IR) & 0x01;

    msr_dr = (msr_value >> MSR_DR) & 0x01;

    msr_ri = (msr_value >> MSR_RI) & 0x01;

    msr_le = (msr_value >> MSR_LE) & 0x01;

}

/* The 32 MSB of the target fpr are undefined. They'll be zero... */

/* 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;

    }

}

int32_t do_sraw(int32_t value, uint32_t shift)

{

    int32_t ret;

    xer_ca = 0;

    if (shift & 0x20) {

        ret = (-1) * ((uint32_t)value >> 31);

        if (ret < 0)

            xer_ca = 1;

    } else {

        ret = value >> (shift & 0x1f);

        if (ret < 0 && (value & ((1 << shift) - 1)) != 0)

            xer_ca = 1;

    }

    return ret;

}

void do_lmw (int reg, uint32_t src)

{

    for (; reg <= 31; reg++, src += 4)

        ugpr(reg) = ld32(src);

}

void do_stmw (int reg, uint32_t dest)

{

    for (; reg <= 31; reg++, dest += 4)

        st32(dest, ugpr(reg));

}

void do_lsw (uint32_t reg, int count, uint32_t src)

{

    uint32_t tmp;

    int sh;

    for (; count > 3; count -= 4, src += 4) {

        ugpr(reg++) = ld32(src);

        if (T2 == 32)

            T2 = 0;

    }

    if (count > 0) {

                tmp = 0;

        for (sh = 24; count > 0; count--, src++, sh -= 8) {

            tmp |= ld8(src) << sh;

        }

        ugpr(reg) = tmp;

    }

}

void do_stsw (uint32_t reg, int count, uint32_t dest)

{

    int sh;

    for (; count > 3; count -= 4, dest += 4) {

        st32(dest, ugpr(reg++));

        if (reg == 32)

            reg = 0;

    }

    if (count > 0) {

        for (sh = 24; count > 0; count--, dest++, sh -= 8) {

            st8(dest, (ugpr(reg) >> sh) & 0xFF);

            }

        }

}

void do_dcbz (void)

{

    int i;

    /* Assume cache line size is 32 */

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

        st32(T0, 0);

        T0 += 4;

    }

}

/* Instruction cache invalidation helper */

void do_icbi (void)

{

    tb_invalidate_page(T0);

}