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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#ifndef _CPU_SH4_H

#define _CPU_SH4_H

#include "config.h"

#define TARGET_LONG_BITS 32

#define TARGET_HAS_ICE 1

#define ELF_MACHINE        EM_SH

#include "cpu-defs.h"

#include "softfloat.h"

#define TARGET_PAGE_BITS 12        /* 4k XXXXX */

#define SR_MD (1 << 30)

#define SR_RB (1 << 29)

#define SR_BL (1 << 28)

#define SR_FD (1 << 15)

#define SR_M  (1 << 9)

#define SR_Q  (1 << 8)

#define SR_S  (1 << 1)

#define SR_T  (1 << 0)

#define FPSCR_FR (1 << 21)

#define FPSCR_SZ (1 << 20)

#define FPSCR_PR (1 << 19)

#define FPSCR_DN (1 << 18)

#define DELAY_SLOT             (1 << 0)

#define DELAY_SLOT_CONDITIONAL (1 << 1)

#define DELAY_SLOT_TRUE        (1 << 2)

#define DELAY_SLOT_CLEARME     (1 << 3)

/* The dynamic value of the DELAY_SLOT_TRUE flag determines whether the jump

 * after the delay slot should be taken or not. It is calculated from SR_T.

 *

 * It is unclear if it is permitted to modify the SR_T flag in a delay slot.

 * The use of DELAY_SLOT_TRUE flag makes us accept such SR_T modification.

 */

/* XXXXX The structure could be made more compact */

typedef struct tlb_t {

    uint8_t asid;                /* address space identifier */

    uint32_t vpn;                /* virtual page number */

    uint8_t v;                        /* validity */

    uint32_t ppn;                /* physical page number */

    uint8_t sz;                        /* page size */

    uint32_t size;                /* cached page size in bytes */

    uint8_t sh;                        /* share status */

    uint8_t c;                        /* cacheability */

    uint8_t pr;                        /* protection key */

    uint8_t d;                        /* dirty */

    uint8_t wt;                        /* write through */

    uint8_t sa;                        /* space attribute (PCMCIA) */

    uint8_t tc;                        /* timing control */

} tlb_t;

#define UTLB_SIZE 64

#define ITLB_SIZE 4

#define NB_MMU_MODES 2

typedef struct CPUSH4State {

    uint32_t flags;                /* general execution flags */

    uint32_t gregs[24];                /* general registers */

    float32 fregs[32];                /* floating point registers */

    uint32_t sr;                /* status register */

    uint32_t ssr;                /* saved status register */

    uint32_t spc;                /* saved program counter */

    uint32_t gbr;                /* global base register */

    uint32_t vbr;                /* vector base register */

    uint32_t sgr;                /* saved global register 15 */

    uint32_t dbr;                /* debug base register */

    uint32_t pc;                /* program counter */

    uint32_t delayed_pc;        /* target of delayed jump */

    uint32_t mach;                /* multiply and accumulate high */

    uint32_t macl;                /* multiply and accumulate low */

    uint32_t pr;                /* procedure register */

    uint32_t fpscr;                /* floating point status/control register */

    uint32_t fpul;                /* floating point communication register */

    /* temporary float registers */

    float32 ft0, ft1;

    float64 dt0, dt1;

    float_status fp_status;

    /* Those belong to the specific unit (SH7750) but are handled here */

    uint32_t mmucr;                /* MMU control register */

    uint32_t pteh;                /* page table entry high register */

    uint32_t ptel;                /* page table entry low register */

    uint32_t ptea;                /* page table entry assistance register */

    uint32_t ttb;                /* tranlation table base register */

    uint32_t tea;                /* TLB exception address register */

    uint32_t tra;                /* TRAPA exception register */

    uint32_t expevt;                /* exception event register */

    uint32_t intevt;                /* interrupt event register */

    int user_mode_only;

    int interrupt_request;

     CPU_COMMON tlb_t utlb[UTLB_SIZE];        /* unified translation table */

    tlb_t itlb[ITLB_SIZE];        /* instruction translation table */

    void *intc_handle;

} CPUSH4State;

CPUSH4State *cpu_sh4_init(const char *cpu_model);

int cpu_sh4_exec(CPUSH4State * s);

int cpu_sh4_signal_handler(int host_signum, void *pinfo,

                           void *puc);

#include "softfloat.h"

#define CPUState CPUSH4State

#define cpu_init cpu_sh4_init

#define cpu_exec cpu_sh4_exec

#define cpu_gen_code cpu_sh4_gen_code

#define cpu_signal_handler cpu_sh4_signal_handler

/* MMU modes definitions */

#define MMU_MODE0_SUFFIX _kernel

#define MMU_MODE1_SUFFIX _user

#define MMU_USER_IDX 1

static inline int cpu_mmu_index (CPUState *env)

{

    return (env->sr & SR_MD) == 0 ? 1 : 0;

}

#include "cpu-all.h"

/* Memory access type */

enum {

    /* Privilege */

    ACCESS_PRIV = 0x01,

    /* Direction */

    ACCESS_WRITE = 0x02,

    /* Type of instruction */

    ACCESS_CODE = 0x10,

    ACCESS_INT = 0x20

};

/* MMU control register */

#define MMUCR    0x1F000010

#define MMUCR_AT (1<<0)

#define MMUCR_SV (1<<8)

#define MMUCR_URC_BITS (6)

#define MMUCR_URC_OFFSET (10)

#define MMUCR_URC_SIZE (1 << MMUCR_URC_BITS)

#define MMUCR_URC_MASK (((MMUCR_URC_SIZE) - 1) << MMUCR_URC_OFFSET)

static inline int cpu_mmucr_urc (uint32_t mmucr)

{

    return ((mmucr & MMUCR_URC_MASK) >> MMUCR_URC_OFFSET);

}

/* PTEH : Page Translation Entry High register */

#define PTEH_ASID_BITS (8)

#define PTEH_ASID_SIZE (1 << PTEH_ASID_BITS)

#define PTEH_ASID_MASK (PTEH_ASID_SIZE - 1)

#define cpu_pteh_asid(pteh) ((pteh) & PTEH_ASID_MASK)

#define PTEH_VPN_BITS (22)

#define PTEH_VPN_OFFSET (10)

#define PTEH_VPN_SIZE (1 << PTEH_VPN_BITS)

#define PTEH_VPN_MASK (((PTEH_VPN_SIZE) - 1) << PTEH_VPN_OFFSET)

static inline int cpu_pteh_vpn (uint32_t pteh)

{

    return ((pteh & PTEH_VPN_MASK) >> PTEH_VPN_OFFSET);

}

/* PTEL : Page Translation Entry Low register */

#define PTEL_V        (1 << 8)

#define cpu_ptel_v(ptel) (((ptel) & PTEL_V) >> 8)

#define PTEL_C        (1 << 3)

#define cpu_ptel_c(ptel) (((ptel) & PTEL_C) >> 3)

#define PTEL_D        (1 << 2)

#define cpu_ptel_d(ptel) (((ptel) & PTEL_D) >> 2)

#define PTEL_SH       (1 << 1)

#define cpu_ptel_sh(ptel)(((ptel) & PTEL_SH) >> 1)

#define PTEL_WT       (1 << 0)

#define cpu_ptel_wt(ptel) ((ptel) & PTEL_WT)

#define PTEL_SZ_HIGH_OFFSET  (7)

#define PTEL_SZ_HIGH  (1 << PTEL_SZ_HIGH_OFFSET)

#define PTEL_SZ_LOW_OFFSET   (4)

#define PTEL_SZ_LOW   (1 << PTEL_SZ_LOW_OFFSET)

static inline int cpu_ptel_sz (uint32_t ptel)

{

    int sz;

    sz = (ptel & PTEL_SZ_HIGH) >> PTEL_SZ_HIGH_OFFSET;

    sz <<= 1;

    sz |= (ptel & PTEL_SZ_LOW) >> PTEL_SZ_LOW_OFFSET;

    return sz;

}

#define PTEL_PPN_BITS (19)

#define PTEL_PPN_OFFSET (10)

#define PTEL_PPN_SIZE (1 << PTEL_PPN_BITS)

#define PTEL_PPN_MASK (((PTEL_PPN_SIZE) - 1) << PTEL_PPN_OFFSET)

static inline int cpu_ptel_ppn (uint32_t ptel)

{

    return ((ptel & PTEL_PPN_MASK) >> PTEL_PPN_OFFSET);

}

#define PTEL_PR_BITS   (2)

#define PTEL_PR_OFFSET (5)

#define PTEL_PR_SIZE (1 << PTEL_PR_BITS)

#define PTEL_PR_MASK (((PTEL_PR_SIZE) - 1) << PTEL_PR_OFFSET)

static inline int cpu_ptel_pr (uint32_t ptel)

{

    return ((ptel & PTEL_PR_MASK) >> PTEL_PR_OFFSET);

}

/* PTEA : Page Translation Entry Assistance register */

#define PTEA_SA_BITS (3)

#define PTEA_SA_SIZE (1 << PTEA_SA_BITS)

#define PTEA_SA_MASK (PTEA_SA_SIZE - 1)

#define cpu_ptea_sa(ptea) ((ptea) & PTEA_SA_MASK)

#define PTEA_TC        (1 << 3)

#define cpu_ptea_tc(ptea) (((ptea) & PTEA_TC) >> 3)

#endif                                /* _CPU_SH4_H */