Archipelago » qemu

/*

 *  SH4 emulation

 *

 *  Copyright (c) 2005 Samuel Tardieu

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include <assert.h>

#include <stdlib.h>

#include "exec.h"

#include "helper.h"

static void cpu_restore_state_from_retaddr(void *retaddr)

{

    TranslationBlock *tb;

    unsigned long pc;

    if (retaddr) {

        pc = (unsigned long) retaddr;

        tb = tb_find_pc(pc);

        if (tb) {

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

               a virtual CPU fault */

            cpu_restore_state(tb, env, pc);

        }

    }

}

#ifndef CONFIG_USER_ONLY

#define MMUSUFFIX _mmu

#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"

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

{

    CPUState *saved_env;

    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_sh4_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);

    if (ret) {

        /* now we have a real cpu fault */

        cpu_restore_state_from_retaddr(retaddr);

        cpu_loop_exit();

    }

    env = saved_env;

}

#endif

void helper_ldtlb(void)

{

#ifdef CONFIG_USER_ONLY

    /* XXXXX */

    cpu_abort(env, "Unhandled ldtlb");

#else

    cpu_load_tlb(env);

#endif

}

static inline void raise_exception(int index, void *retaddr)

{

    env->exception_index = index;

    cpu_restore_state_from_retaddr(retaddr);

    cpu_loop_exit();

}

void helper_raise_illegal_instruction(void)

{

    raise_exception(0x180, GETPC());

}

void helper_raise_slot_illegal_instruction(void)

{

    raise_exception(0x1a0, GETPC());

}

void helper_raise_fpu_disable(void)

{

    raise_exception(0x800, GETPC());

}

void helper_raise_slot_fpu_disable(void)

{

    raise_exception(0x820, GETPC());

}

void helper_debug(void)

{

    env->exception_index = EXCP_DEBUG;

    cpu_loop_exit();

}

void helper_sleep(uint32_t next_pc)

{

    env->halted = 1;

    env->in_sleep = 1;

    env->exception_index = EXCP_HLT;

    env->pc = next_pc;

    cpu_loop_exit();

}

void helper_trapa(uint32_t tra)

{

    env->tra = tra << 2;

    raise_exception(0x160, GETPC());

}

void helper_movcal(uint32_t address, uint32_t value)

{

    if (cpu_sh4_is_cached (env, address))

    {

        memory_content *r = malloc (sizeof(memory_content));

        r->address = address;

        r->value = value;

        r->next = NULL;

        *(env->movcal_backup_tail) = r;

        env->movcal_backup_tail = &(r->next);

    }

}

void helper_discard_movcal_backup(void)

{

    memory_content *current = env->movcal_backup;

    while(current)

    {

        memory_content *next = current->next;

        free (current);

        env->movcal_backup = current = next;

        if (current == NULL)

            env->movcal_backup_tail = &(env->movcal_backup);

    } 

}

void helper_ocbi(uint32_t address)

{

    memory_content **current = &(env->movcal_backup);

    while (*current)

    {

        uint32_t a = (*current)->address;

        if ((a & ~0x1F) == (address & ~0x1F))

        {

            memory_content *next = (*current)->next;

            stl(a, (*current)->value);

            if (next == NULL)

            {

                env->movcal_backup_tail = current;

            }

            free (*current);

            *current = next;

            break;

        }

    }

}

uint32_t helper_addc(uint32_t arg0, uint32_t arg1)

{

    uint32_t tmp0, tmp1;

    tmp1 = arg0 + arg1;

    tmp0 = arg1;

    arg1 = tmp1 + (env->sr & 1);

    if (tmp0 > tmp1)

        env->sr |= SR_T;

    else

        env->sr &= ~SR_T;

    if (tmp1 > arg1)

        env->sr |= SR_T;

    return arg1;

}

uint32_t helper_addv(uint32_t arg0, uint32_t arg1)

{

    uint32_t dest, src, ans;

    if ((int32_t) arg1 >= 0)

        dest = 0;

    else

        dest = 1;

    if ((int32_t) arg0 >= 0)

        src = 0;

    else

        src = 1;

    src += dest;

    arg1 += arg0;

    if ((int32_t) arg1 >= 0)

        ans = 0;

    else

        ans = 1;

    ans += dest;

    if (src == 0 || src == 2) {

        if (ans == 1)

            env->sr |= SR_T;

        else

            env->sr &= ~SR_T;

    } else

        env->sr &= ~SR_T;

    return arg1;

}

#define T (env->sr & SR_T)

#define Q (env->sr & SR_Q ? 1 : 0)

#define M (env->sr & SR_M ? 1 : 0)

#define SETT env->sr |= SR_T

#define CLRT env->sr &= ~SR_T

#define SETQ env->sr |= SR_Q

#define CLRQ env->sr &= ~SR_Q

#define SETM env->sr |= SR_M

#define CLRM env->sr &= ~SR_M

uint32_t helper_div1(uint32_t arg0, uint32_t arg1)

{

    uint32_t tmp0, tmp2;

    uint8_t old_q, tmp1 = 0xff;

    //printf("div1 arg0=0x%08x arg1=0x%08x M=%d Q=%d T=%d\n", arg0, arg1, M, Q, T);

    old_q = Q;

    if ((0x80000000 & arg1) != 0)

        SETQ;

    else

        CLRQ;

    tmp2 = arg0;

    arg1 <<= 1;

    arg1 |= T;

    switch (old_q) {

    case 0:

        switch (M) {

        case 0:

            tmp0 = arg1;

            arg1 -= tmp2;

            tmp1 = arg1 > tmp0;

            switch (Q) {

            case 0:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        case 1:

            tmp0 = arg1;

            arg1 += tmp2;

            tmp1 = arg1 < tmp0;

            switch (Q) {

            case 0:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        }

        break;

    case 1:

        switch (M) {

        case 0:

            tmp0 = arg1;

            arg1 += tmp2;

            tmp1 = arg1 < tmp0;

            switch (Q) {

            case 0:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        case 1:

            tmp0 = arg1;

            arg1 -= tmp2;

            tmp1 = arg1 > tmp0;

            switch (Q) {

            case 0:

                if (tmp1 == 0)

                    SETQ;

                else

                    CLRQ;

                break;

            case 1:

                if (tmp1)

                    SETQ;

                else

                    CLRQ;

                break;

            }

            break;

        }

        break;

    }

    if (Q == M)

        SETT;

    else

        CLRT;

    //printf("Output: arg1=0x%08x M=%d Q=%d T=%d\n", arg1, M, Q, T);

    return arg1;

}

void helper_macl(uint32_t arg0, uint32_t arg1)

{

    int64_t res;

    res = ((uint64_t) env->mach << 32) | env->macl;

    res += (int64_t) (int32_t) arg0 *(int64_t) (int32_t) arg1;

    env->mach = (res >> 32) & 0xffffffff;

    env->macl = res & 0xffffffff;

    if (env->sr & SR_S) {

        if (res < 0)

            env->mach |= 0xffff0000;

        else

            env->mach &= 0x00007fff;

    }

}

void helper_macw(uint32_t arg0, uint32_t arg1)

{

    int64_t res;

    res = ((uint64_t) env->mach << 32) | env->macl;

    res += (int64_t) (int16_t) arg0 *(int64_t) (int16_t) arg1;

    env->mach = (res >> 32) & 0xffffffff;

    env->macl = res & 0xffffffff;

    if (env->sr & SR_S) {

        if (res < -0x80000000) {

            env->mach = 1;

            env->macl = 0x80000000;

        } else if (res > 0x000000007fffffff) {

            env->mach = 1;

            env->macl = 0x7fffffff;

        }

    }

}

uint32_t helper_subc(uint32_t arg0, uint32_t arg1)

{

    uint32_t tmp0, tmp1;

    tmp1 = arg1 - arg0;

    tmp0 = arg1;

    arg1 = tmp1 - (env->sr & SR_T);

    if (tmp0 < tmp1)

        env->sr |= SR_T;

    else

        env->sr &= ~SR_T;

    if (tmp1 < arg1)

        env->sr |= SR_T;

    return arg1;

}

uint32_t helper_subv(uint32_t arg0, uint32_t arg1)

{

    int32_t dest, src, ans;

    if ((int32_t) arg1 >= 0)

        dest = 0;

    else

        dest = 1;

    if ((int32_t) arg0 >= 0)

        src = 0;

    else

        src = 1;

    src += dest;

    arg1 -= arg0;

    if ((int32_t) arg1 >= 0)

        ans = 0;

    else

        ans = 1;

    ans += dest;

    if (src == 1) {

        if (ans == 1)

            env->sr |= SR_T;

        else

            env->sr &= ~SR_T;

    } else

        env->sr &= ~SR_T;

    return arg1;

}

static inline void set_t(void)

{

    env->sr |= SR_T;

}

static inline void clr_t(void)

{

    env->sr &= ~SR_T;

}

void helper_ld_fpscr(uint32_t val)

{

    env->fpscr = val & FPSCR_MASK;

    if ((val & FPSCR_RM_MASK) == FPSCR_RM_ZERO) {

        set_float_rounding_mode(float_round_to_zero, &env->fp_status);

    } else {

        set_float_rounding_mode(float_round_nearest_even, &env->fp_status);

    }

    set_flush_to_zero((val & FPSCR_DN) != 0, &env->fp_status);

}

static void update_fpscr(void *retaddr)

{

    int xcpt, cause, enable;

    xcpt = get_float_exception_flags(&env->fp_status);

    /* Clear the flag entries */

    env->fpscr &= ~FPSCR_FLAG_MASK;

    if (unlikely(xcpt)) {

        if (xcpt & float_flag_invalid) {

            env->fpscr |= FPSCR_FLAG_V;

        }

        if (xcpt & float_flag_divbyzero) {

            env->fpscr |= FPSCR_FLAG_Z;

        }

        if (xcpt & float_flag_overflow) {

            env->fpscr |= FPSCR_FLAG_O;

        }

        if (xcpt & float_flag_underflow) {

            env->fpscr |= FPSCR_FLAG_U;

        }

        if (xcpt & float_flag_inexact) {

            env->fpscr |= FPSCR_FLAG_I;

        }

        /* Accumulate in cause entries */

        env->fpscr |= (env->fpscr & FPSCR_FLAG_MASK)

                      << (FPSCR_CAUSE_SHIFT - FPSCR_FLAG_SHIFT);

        /* Generate an exception if enabled */

        cause = (env->fpscr & FPSCR_CAUSE_MASK) >> FPSCR_CAUSE_SHIFT;

        enable = (env->fpscr & FPSCR_ENABLE_MASK) >> FPSCR_ENABLE_SHIFT;

        if (cause & enable) {

            cpu_restore_state_from_retaddr(retaddr);

            env->exception_index = 0x120;

            cpu_loop_exit();

        }

    }

}

float32 helper_fabs_FT(float32 t0)

{

    return float32_abs(t0);

}

float64 helper_fabs_DT(float64 t0)

{

    return float64_abs(t0);

}

float32 helper_fadd_FT(float32 t0, float32 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float32_add(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float64 helper_fadd_DT(float64 t0, float64 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float64_add(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

void helper_fcmp_eq_FT(float32 t0, float32 t1)

{

    int relation;

    set_float_exception_flags(0, &env->fp_status);

    relation = float32_compare(t0, t1, &env->fp_status);

    if (unlikely(relation == float_relation_unordered)) {

        update_fpscr(GETPC());

    } else if (relation == float_relation_equal) {

        set_t();

    } else {

        clr_t();

    }

}

void helper_fcmp_eq_DT(float64 t0, float64 t1)

{

    int relation;

    set_float_exception_flags(0, &env->fp_status);

    relation = float64_compare(t0, t1, &env->fp_status);

    if (unlikely(relation == float_relation_unordered)) {

        update_fpscr(GETPC());

    } else if (relation == float_relation_equal) {

        set_t();

    } else {

        clr_t();

    }

}

void helper_fcmp_gt_FT(float32 t0, float32 t1)

{

    int relation;

    set_float_exception_flags(0, &env->fp_status);

    relation = float32_compare(t0, t1, &env->fp_status);

    if (unlikely(relation == float_relation_unordered)) {

        update_fpscr(GETPC());

    } else if (relation == float_relation_greater) {

        set_t();

    } else {

        clr_t();

    }

}

void helper_fcmp_gt_DT(float64 t0, float64 t1)

{

    int relation;

    set_float_exception_flags(0, &env->fp_status);

    relation = float64_compare(t0, t1, &env->fp_status);

    if (unlikely(relation == float_relation_unordered)) {

        update_fpscr(GETPC());

    } else if (relation == float_relation_greater) {

        set_t();

    } else {

        clr_t();

    }

}

float64 helper_fcnvsd_FT_DT(float32 t0)

{

    float64 ret;

    set_float_exception_flags(0, &env->fp_status);

    ret = float32_to_float64(t0, &env->fp_status);

    update_fpscr(GETPC());

    return ret;

}

float32 helper_fcnvds_DT_FT(float64 t0)

{

    float32 ret;

    set_float_exception_flags(0, &env->fp_status);

    ret = float64_to_float32(t0, &env->fp_status);

    update_fpscr(GETPC());

    return ret;

}

float32 helper_fdiv_FT(float32 t0, float32 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float32_div(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float64 helper_fdiv_DT(float64 t0, float64 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float64_div(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float32 helper_float_FT(uint32_t t0)

{

    float32 ret;

    set_float_exception_flags(0, &env->fp_status);

    ret = int32_to_float32(t0, &env->fp_status);

    update_fpscr(GETPC());

    return ret;

}

float64 helper_float_DT(uint32_t t0)

{

    float64 ret;

    set_float_exception_flags(0, &env->fp_status);

    ret = int32_to_float64(t0, &env->fp_status);

    update_fpscr(GETPC());

    return ret;

}

float32 helper_fmac_FT(float32 t0, float32 t1, float32 t2)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float32_mul(t0, t1, &env->fp_status);

    t0 = float32_add(t0, t2, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float32 helper_fmul_FT(float32 t0, float32 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float32_mul(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float64 helper_fmul_DT(float64 t0, float64 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float64_mul(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float32 helper_fneg_T(float32 t0)

{

    return float32_chs(t0);

}

float32 helper_fsqrt_FT(float32 t0)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float32_sqrt(t0, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float64 helper_fsqrt_DT(float64 t0)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float64_sqrt(t0, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float32 helper_fsub_FT(float32 t0, float32 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float32_sub(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

float64 helper_fsub_DT(float64 t0, float64 t1)

{

    set_float_exception_flags(0, &env->fp_status);

    t0 = float64_sub(t0, t1, &env->fp_status);

    update_fpscr(GETPC());

    return t0;

}

uint32_t helper_ftrc_FT(float32 t0)

{

    uint32_t ret;

    set_float_exception_flags(0, &env->fp_status);

    ret = float32_to_int32_round_to_zero(t0, &env->fp_status);

    update_fpscr(GETPC());

    return ret;

}

uint32_t helper_ftrc_DT(float64 t0)

{

    uint32_t ret;

    set_float_exception_flags(0, &env->fp_status);

    ret = float64_to_int32_round_to_zero(t0, &env->fp_status);

    update_fpscr(GETPC());

    return ret;

}

void helper_fipr(uint32_t m, uint32_t n)

{

    int bank, i;

    float32 r, p;

    bank = (env->sr & FPSCR_FR) ? 16 : 0;

    r = float32_zero;

    set_float_exception_flags(0, &env->fp_status);

    for (i = 0 ; i < 4 ; i++) {

        p = float32_mul(env->fregs[bank + m + i],

                        env->fregs[bank + n + i],

                        &env->fp_status);

        r = float32_add(r, p, &env->fp_status);

    }

    update_fpscr(GETPC());

    env->fregs[bank + n + 3] = r;

}

void helper_ftrv(uint32_t n)

{

    int bank_matrix, bank_vector;

    int i, j;

    float32 r[4];

    float32 p;

    bank_matrix = (env->sr & FPSCR_FR) ? 0 : 16;

    bank_vector = (env->sr & FPSCR_FR) ? 16 : 0;

    set_float_exception_flags(0, &env->fp_status);

    for (i = 0 ; i < 4 ; i++) {

        r[i] = float32_zero;

        for (j = 0 ; j < 4 ; j++) {

            p = float32_mul(env->fregs[bank_matrix + 4 * j + i],

                            env->fregs[bank_vector + j],

                            &env->fp_status);

            r[i] = float32_add(r[i], p, &env->fp_status);

        }

    }

    update_fpscr(GETPC());

    for (i = 0 ; i < 4 ; i++) {

        env->fregs[bank_vector + i] = r[i];

    }

}