Archipelago » qemu

/*

 *  Generic thunking code to convert data between host and target CPU

 *

 *  Copyright (c) 2003 Fabrice Bellard

 *

 * 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/>.

 */

#ifndef THUNK_H

#define THUNK_H

#include <inttypes.h>

#include "cpu.h"

/* types enums definitions */

typedef enum argtype {

    TYPE_NULL,

    TYPE_CHAR,

    TYPE_SHORT,

    TYPE_INT,

    TYPE_LONG,

    TYPE_ULONG,

    TYPE_PTRVOID, /* pointer on unknown data */

    TYPE_LONGLONG,

    TYPE_ULONGLONG,

    TYPE_PTR,

    TYPE_ARRAY,

    TYPE_STRUCT,

} argtype;

#define MK_PTR(type) TYPE_PTR, type

#define MK_ARRAY(type, size) TYPE_ARRAY, size, type

#define MK_STRUCT(id) TYPE_STRUCT, id

#define THUNK_TARGET 0

#define THUNK_HOST   1

typedef struct {

    /* standard struct handling */

    const argtype *field_types;

    int nb_fields;

    int *field_offsets[2];

    /* special handling */

    void (*convert[2])(void *dst, const void *src);

    int size[2];

    int align[2];

    const char *name;

} StructEntry;

/* Translation table for bitmasks... */

typedef struct bitmask_transtbl {

        unsigned int        x86_mask;

        unsigned int        x86_bits;

        unsigned int        alpha_mask;

        unsigned int        alpha_bits;

} bitmask_transtbl;

void thunk_register_struct(int id, const char *name, const argtype *types);

void thunk_register_struct_direct(int id, const char *name,

                                  const StructEntry *se1);

const argtype *thunk_convert(void *dst, const void *src,

                             const argtype *type_ptr, int to_host);

#ifndef NO_THUNK_TYPE_SIZE

extern StructEntry struct_entries[];

int thunk_type_size_array(const argtype *type_ptr, int is_host);

int thunk_type_align_array(const argtype *type_ptr, int is_host);

static inline int thunk_type_size(const argtype *type_ptr, int is_host)

{

    int type, size;

    const StructEntry *se;

    type = *type_ptr;

    switch(type) {

    case TYPE_CHAR:

        return 1;

    case TYPE_SHORT:

        return 2;

    case TYPE_INT:

        return 4;

    case TYPE_LONGLONG:

    case TYPE_ULONGLONG:

        return 8;

    case TYPE_LONG:

    case TYPE_ULONG:

    case TYPE_PTRVOID:

    case TYPE_PTR:

        if (is_host) {

            return HOST_LONG_SIZE;

        } else {

            return TARGET_ABI_BITS / 8;

        }

        break;

    case TYPE_ARRAY:

        size = type_ptr[1];

        return size * thunk_type_size_array(type_ptr + 2, is_host);

    case TYPE_STRUCT:

        se = struct_entries + type_ptr[1];

        return se->size[is_host];

    default:

        return -1;

    }

}

static inline int thunk_type_align(const argtype *type_ptr, int is_host)

{

    int type;

    const StructEntry *se;

    type = *type_ptr;

    switch(type) {

    case TYPE_CHAR:

        return 1;

    case TYPE_SHORT:

        return 2;

    case TYPE_INT:

        return 4;

    case TYPE_LONGLONG:

    case TYPE_ULONGLONG:

        return 8;

    case TYPE_LONG:

    case TYPE_ULONG:

    case TYPE_PTRVOID:

    case TYPE_PTR:

        if (is_host) {

            return HOST_LONG_SIZE;

        } else {

            return TARGET_ABI_BITS / 8;

        }

        break;

    case TYPE_ARRAY:

        return thunk_type_align_array(type_ptr + 2, is_host);

    case TYPE_STRUCT:

        se = struct_entries + type_ptr[1];

        return se->align[is_host];

    default:

        return -1;

    }

}

#endif /* NO_THUNK_TYPE_SIZE */

unsigned int target_to_host_bitmask(unsigned int x86_mask,

                                    const bitmask_transtbl * trans_tbl);

unsigned int host_to_target_bitmask(unsigned int alpha_mask,

                                    const bitmask_transtbl * trans_tbl);

#endif