Archipelago » qemu

#include <math.h>

#include <fenv.h>

#include "exec.h"

//#define DEBUG_MMU

void raise_exception(int tt)

{

    env->exception_index = tt;

    cpu_loop_exit();

}   

#ifdef USE_INT_TO_FLOAT_HELPERS

void do_fitos(void)

{

    FT0 = (float) *((int32_t *)&FT1);

}

void do_fitod(void)

{

    DT0 = (double) *((int32_t *)&FT1);

}

#endif

void do_fabss(void)

{

    FT0 = fabsf(FT1);

}

void do_fsqrts(void)

{

    FT0 = sqrtf(FT1);

}

void do_fsqrtd(void)

{

    DT0 = sqrt(DT1);

}

void do_fcmps (void)

{

    if (isnan(FT0) || isnan(FT1)) {

        T0 = FSR_FCC1 | FSR_FCC0;

        env->fsr &= ~(FSR_FCC1 | FSR_FCC0);

        env->fsr |= T0;

        if (env->fsr & FSR_NVM) {

            raise_exception(TT_FP_EXCP);

        } else {

            env->fsr |= FSR_NVA;

        }

    } else if (FT0 < FT1) {

        T0 = FSR_FCC0;

    } else if (FT0 > FT1) {

        T0 = FSR_FCC1;

    } else {

        T0 = 0;

    }

    env->fsr = T0;

}

void do_fcmpd (void)

{

    if (isnan(DT0) || isnan(DT1)) {

        T0 = FSR_FCC1 | FSR_FCC0;

        env->fsr &= ~(FSR_FCC1 | FSR_FCC0);

        env->fsr |= T0;

        if (env->fsr & FSR_NVM) {

            raise_exception(TT_FP_EXCP);

        } else {

            env->fsr |= FSR_NVA;

        }

    } else if (DT0 < DT1) {

        T0 = FSR_FCC0;

    } else if (DT0 > DT1) {

        T0 = FSR_FCC1;

    } else {

        T0 = 0;

    }

    env->fsr = T0;

}

void helper_ld_asi(int asi, int size, int sign)

{

    uint32_t ret;

    switch (asi) {

    case 3: /* MMU probe */

        {

            int mmulev;

            mmulev = (T0 >> 8) & 15;

            if (mmulev > 4)

                ret = 0;

            else {

                ret = mmu_probe(T0, mmulev);

                //bswap32s(&ret);

            }

#ifdef DEBUG_MMU

            printf("mmu_probe: 0x%08x (lev %d) -> 0x%08x\n", T0, mmulev, ret);

#endif

        }

        break;

    case 4: /* read MMU regs */

        {

            int reg = (T0 >> 8) & 0xf;

            ret = env->mmuregs[reg];

            if (reg == 3) /* Fault status cleared on read */

                env->mmuregs[reg] = 0;

#ifdef DEBUG_MMU

            printf("mmu_read: reg[%d] = 0x%08x\n", reg, ret);

#endif

        }

        break;

    case 0x20 ... 0x2f: /* MMU passthrough */

        cpu_physical_memory_read(T0, (void *) &ret, size);

        if (size == 4)

            tswap32s(&ret);

        else if (size == 2)

            tswap16s((uint16_t *)&ret);

        break;

    default:

        ret = 0;

        break;

    }

    T1 = ret;

}

void helper_st_asi(int asi, int size, int sign)

{

    switch(asi) {

    case 3: /* MMU flush */

        {

            int mmulev;

            mmulev = (T0 >> 8) & 15;

#ifdef DEBUG_MMU

            printf("mmu flush level %d\n", mmulev);

#endif

            switch (mmulev) {

            case 0: // flush page

                tlb_flush_page(env, T0 & 0xfffff000);

                break;

            case 1: // flush segment (256k)

            case 2: // flush region (16M)

            case 3: // flush context (4G)

            case 4: // flush entire

                tlb_flush(env, 1);

                break;

            default:

                break;

            }

#ifdef DEBUG_MMU

            dump_mmu();

#endif

            return;

        }

    case 4: /* write MMU regs */

        {

            int reg = (T0 >> 8) & 0xf, oldreg;

            oldreg = env->mmuregs[reg];

            switch(reg) {

            case 0:

                env->mmuregs[reg] &= ~(MMU_E | MMU_NF);

                env->mmuregs[reg] |= T1 & (MMU_E | MMU_NF);

                // Mappings generated during no-fault mode or MMU

                // disabled mode are invalid in normal mode

                if (oldreg != env->mmuregs[reg])

                    tlb_flush(env, 1);

                break;

            case 2:

                env->mmuregs[reg] = T1;

                if (oldreg != env->mmuregs[reg]) {

                    /* we flush when the MMU context changes because

                       QEMU has no MMU context support */

                    tlb_flush(env, 1);

                }

                break;

            case 3:

            case 4:

                break;

            default:

                env->mmuregs[reg] = T1;

                break;

            }

#ifdef DEBUG_MMU

            if (oldreg != env->mmuregs[reg]) {

                printf("mmu change reg[%d]: 0x%08x -> 0x%08x\n", reg, oldreg, env->mmuregs[reg]);

            }

            dump_mmu();

#endif

            return;

        }

    case 0x17: /* Block copy, sta access */

        {

            // value (T1) = src

            // address (T0) = dst

            // copy 32 bytes

            int src = T1, dst = T0;

            uint8_t temp[32];

            tswap32s(&src);

            cpu_physical_memory_read(src, (void *) &temp, 32);

            cpu_physical_memory_write(dst, (void *) &temp, 32);

        }

        return;

    case 0x1f: /* Block fill, stda access */

        {

            // value (T1, T2)

            // address (T0) = dst

            // fill 32 bytes

            int i, dst = T0;

            uint64_t val;

            val = (((uint64_t)T1) << 32) | T2;

            tswap64s(&val);

            for (i = 0; i < 32; i += 8, dst += 8) {

                cpu_physical_memory_write(dst, (void *) &val, 8);

            }

        }

        return;

    case 0x20 ... 0x2f: /* MMU passthrough */

        {

            int temp = T1;

            if (size == 4)

                tswap32s(&temp);

            else if (size == 2)

                tswap16s((uint16_t *)&temp);

            cpu_physical_memory_write(T0, (void *) &temp, size);

        }

        return;

    default:

        return;

    }

}

void helper_rett()

{

    unsigned int cwp;

    env->psret = 1;

    cwp = (env->cwp + 1) & (NWINDOWS - 1); 

    if (env->wim & (1 << cwp)) {

        raise_exception(TT_WIN_UNF);

    }

    set_cwp(cwp);

    env->psrs = env->psrps;

}

void helper_ldfsr(void)

{

    switch (env->fsr & FSR_RD_MASK) {

    case FSR_RD_NEAREST:

        fesetround(FE_TONEAREST);

        break;

    case FSR_RD_ZERO:

        fesetround(FE_TOWARDZERO);

        break;

    case FSR_RD_POS:

        fesetround(FE_UPWARD);

        break;

    case FSR_RD_NEG:

        fesetround(FE_DOWNWARD);

        break;

    }

}

void cpu_get_fp64(uint64_t *pmant, uint16_t *pexp, double f)

{

    int exptemp;

    *pmant = ldexp(frexp(f, &exptemp), 53);

    *pexp = exptemp;

}

double cpu_put_fp64(uint64_t mant, uint16_t exp)

{

    return ldexp((double) mant, exp - 53);

}

void helper_debug()

{

    env->exception_index = EXCP_DEBUG;

    cpu_loop_exit();

}

void do_wrpsr()

{

    PUT_PSR(env, T0);

}

void do_rdpsr()

{

    T0 = GET_PSR(env);

}