Archipelago » qemu

/*

 *  PowerPC emulation helpers for qemu.

 * 

 *  Copyright (c) 2003-2005 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 "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

//#define DEBUG_OP

//#define DEBUG_EXCEPTIONS

//#define FLUSH_ALL_TLBS

#define Ts0 (long)((target_long)T0)

#define Ts1 (long)((target_long)T1)

#define Ts2 (long)((target_long)T2)

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

/* 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_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);

}

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

/* Fixed point operations helpers */

void do_addo (void)

{

    T2 = T0;

    T0 += T1;

    if (likely(!((T2 ^ T1 ^ (-1)) & (T2 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

}

void do_addco (void)

{

    T2 = T0;

    T0 += T1;

    if (likely(T0 >= T2)) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

    if (likely(!((T2 ^ T1 ^ (-1)) & (T2 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

}

void do_adde (void)

{

    T2 = T0;

    T0 += T1 + xer_ca;

    if (likely(!(T0 < T2 || (xer_ca == 1 && T0 == T2)))) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

}

void do_addeo (void)

{

    T2 = T0;

    T0 += T1 + xer_ca;

    if (likely(!(T0 < T2 || (xer_ca == 1 && T0 == T2)))) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

    if (likely(!((T2 ^ T1 ^ (-1)) & (T2 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

}

void do_addmeo (void)

{

    T1 = T0;

    T0 += xer_ca + (-1);

    if (likely(!(T1 & (T1 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

    if (likely(T1 != 0))

        xer_ca = 1;

}

void do_addzeo (void)

{

    T1 = T0;

    T0 += xer_ca;

    if (likely(!((T1 ^ (-1)) & (T1 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

    if (likely(T0 >= T1)) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

}

void do_divwo (void)

{

    if (likely(!((Ts0 == INT32_MIN && Ts1 == -1) || Ts1 == 0))) {

        xer_ov = 0;

        T0 = (Ts0 / Ts1);

    } else {

        xer_so = 1;

        xer_ov = 1;

        T0 = (-1) * ((uint32_t)T0 >> 31);

    }

}

void do_divwuo (void)

{

    if (likely((uint32_t)T1 != 0)) {

        xer_ov = 0;

        T0 = (uint32_t)T0 / (uint32_t)T1;

    } else {

        xer_so = 1;

        xer_ov = 1;

        T0 = 0;

    }

}

void do_mullwo (void)

{

    int64_t res = (int64_t)Ts0 * (int64_t)Ts1;

    if (likely((int32_t)res == res)) {

        xer_ov = 0;

    } else {

        xer_ov = 1;

        xer_so = 1;

    }

    T0 = (int32_t)res;

}

void do_nego (void)

{

    if (likely(T0 != INT32_MIN)) {

        xer_ov = 0;

        T0 = -Ts0;

    } else {

        xer_ov = 1;

        xer_so = 1;

    }

}

void do_subfo (void)

{

    T2 = T0;

    T0 = T1 - T0;

    if (likely(!(((~T2) ^ T1 ^ (-1)) & ((~T2) ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

    RETURN();

}

void do_subfco (void)

{

    T2 = T0;

    T0 = T1 - T0;

    if (likely(T0 > T1)) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

    if (likely(!(((~T2) ^ T1 ^ (-1)) & ((~T2) ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

}

void do_subfe (void)

{

    T0 = T1 + ~T0 + xer_ca;

    if (likely(T0 >= T1 && (xer_ca == 0 || T0 != T1))) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

}

void do_subfeo (void)

{

    T2 = T0;

    T0 = T1 + ~T0 + xer_ca;

    if (likely(!((~T2 ^ T1 ^ (-1)) & (~T2 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

    if (likely(T0 >= T1 && (xer_ca == 0 || T0 != T1))) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

}

void do_subfmeo (void)

{

    T1 = T0;

    T0 = ~T0 + xer_ca - 1;

    if (likely(!(~T1 & (~T1 ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_so = 1;

        xer_ov = 1;

    }

    if (likely(T1 != -1))

        xer_ca = 1;

}

void do_subfzeo (void)

{

    T1 = T0;

    T0 = ~T0 + xer_ca;

    if (likely(!((~T1 ^ (-1)) & ((~T1) ^ T0) & (1 << 31)))) {

        xer_ov = 0;

    } else {

        xer_ov = 1;

        xer_so = 1;

    }

    if (likely(T0 >= ~T1)) {

        xer_ca = 0;

    } else {

        xer_ca = 1;

    }

}

/* shift right arithmetic helper */

void do_sraw (void)

{

    int32_t ret;

    if (likely(!(T1 & 0x20UL))) {

        if (likely(T1 != 0)) {

            ret = (int32_t)T0 >> (T1 & 0x1fUL);

            if (likely(ret >= 0 || ((int32_t)T0 & ((1 << T1) - 1)) == 0)) {

    xer_ca = 0;

            } else {

            xer_ca = 1;

            }

        } else {

        ret = T0;

            xer_ca = 0;

        }

    } else {

        ret = (-1) * ((uint32_t)T0 >> 31);

        if (likely(ret >= 0 || ((uint32_t)T0 & ~0x80000000UL) == 0)) {

            xer_ca = 0;

    } else {

            xer_ca = 1;

    }

    }

    T0 = ret;

}

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

/* Floating point operations helpers */

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 PowerPC 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 PowerPC 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 = float64_mul(FT0, FT1, &env->fp_status);

    FT0 = float64_add(FT0, FT2, &env->fp_status);

    if (likely(!isnan(FT0)))

        FT0 = float64_chs(FT0);

}

void do_fnmsub (void)

{

    FT0 = float64_mul(FT0, FT1, &env->fp_status);

    FT0 = float64_sub(FT0, FT2, &env->fp_status);

    if (likely(!isnan(FT0)))

        FT0 = float64_chs(FT0);

}

void do_fsqrt (void)

{

    FT0 = float64_sqrt(FT0, &env->fp_status);

}

void do_fres (void)

{

    union {

        double d;

        uint64_t i;

    } p;

    if (likely(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 (likely(isnormal(FT0) && FT0 > 0.0)) {

        FT0 = float64_sqrt(FT0, &env->fp_status);

        FT0 = float32_div(1.0, FT0, &env->fp_status);

    } 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 (likely(!isnan(FT0) && !isnan(FT1))) {

        if (float64_lt(FT0, FT1, &env->fp_status)) {

            T0 = 0x08UL;

        } else if (!float64_le(FT0, FT1, &env->fp_status)) {

            T0 = 0x04UL;

        } else {

            T0 = 0x02UL;

        }

    } else {

        T0 = 0x01UL;

        env->fpscr[4] |= 0x1;

        env->fpscr[6] |= 0x1;

    }

    env->fpscr[3] = T0;

}

void do_fcmpo (void)

{

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

    if (likely(!isnan(FT0) && !isnan(FT1))) {

        if (float64_lt(FT0, FT1, &env->fp_status)) {

            T0 = 0x08UL;

        } else if (!float64_le(FT0, FT1, &env->fp_status)) {

            T0 = 0x04UL;

        } else {

            T0 = 0x02UL;

        }

    } else {

        T0 = 0x01UL;

        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;

        }

    }

    env->fpscr[3] = T0;

}

void do_rfi (void)

{

    env->nip = env->spr[SPR_SRR0] & ~0x00000003;

    T0 = env->spr[SPR_SRR1] & ~0xFFFF0000UL;

    do_store_msr(env, T0);

#if defined (DEBUG_OP)

    dump_rfi();

#endif

    env->interrupt_request |= CPU_INTERRUPT_EXITTB;

}

void do_tw (uint32_t cmp, int flags)

{

    if (!likely(!((Ts0 < (int32_t)cmp && (flags & 0x10)) ||

                  (Ts0 > (int32_t)cmp && (flags & 0x08)) ||

                  (Ts0 == (int32_t)cmp && (flags & 0x04)) ||

                  (T0 < cmp && (flags & 0x02)) ||

                  (T0 > cmp && (flags & 0x01)))))

        do_raise_exception_err(EXCP_PROGRAM, EXCP_TRAP);

}

/* Instruction cache invalidation helper */

void do_icbi (void)

{

    uint32_t tmp;

    /* Invalidate one cache line :

     * PowerPC specification says this is to be treated like a load

     * (not a fetch) by the MMU. To be sure it will be so,

     * do the load "by hand".

     */

#if defined(TARGET_PPC64)

    if (!msr_sf)

        T0 &= 0xFFFFFFFFULL;

#endif

    tmp = ldl_kernel(T0);

    T0 &= ~(ICACHE_LINE_SIZE - 1);

    tb_invalidate_page_range(T0, T0 + ICACHE_LINE_SIZE);

}

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

/* MMU related helpers */

/* TLB invalidation helpers */

void do_tlbia (void)

{

    tlb_flush(env, 1);

}

void do_tlbie (void)

{

#if !defined(FLUSH_ALL_TLBS)

    tlb_flush_page(env, T0);

#else

    do_tlbia();

#endif

}

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

/* Softmmu support */

#if !defined (CONFIG_USER_ONLY)

#define MMUSUFFIX _mmu

#define GETPC() (__builtin_return_address(0))

#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"

/* try to fill the TLB and return an exception if error. If retaddr is

   NULL, it means that the function was called in C code (i.e. not

   from generated code or from helper.c) */

/* XXX: fix it to restore all registers */

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

{

    TranslationBlock *tb;

    CPUState *saved_env;

    target_phys_addr_t 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_ppc_handle_mmu_fault(env, addr, is_write, is_user, 1);

    if (!likely(ret == 0)) {

        if (likely(retaddr)) {

            /* now we have a real cpu fault */

            pc = (target_phys_addr_t)retaddr;

            tb = tb_find_pc(pc);

            if (likely(tb)) {

                /* the PC is inside the translated code. It means that we have

                   a virtual CPU fault */

                cpu_restore_state(tb, env, pc, NULL);

}

        }

        do_raise_exception_err(env->exception_index, env->error_code);

    }

    env = saved_env;

}

#endif /* !CONFIG_USER_ONLY */