[qemu.git] / thunk.c

/*
 *  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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

#include "qemu.h"
#include "thunk.h"

//#define DEBUG

#define MAX_STRUCTS 128

/* XXX: make it dynamic */
StructEntry struct_entries[MAX_STRUCTS];

static inline const argtype *thunk_type_next(const argtype *type_ptr)
{
    int type;

    type = *type_ptr++;
    switch(type) {
    case TYPE_CHAR:
    case TYPE_SHORT:
    case TYPE_INT:
    case TYPE_LONGLONG:
    case TYPE_ULONGLONG:
    case TYPE_LONG:
    case TYPE_ULONG:
    case TYPE_PTRVOID:
        return type_ptr;
    case TYPE_PTR:
        return thunk_type_next(type_ptr);
    case TYPE_ARRAY:
        return thunk_type_next(type_ptr + 1);
    case TYPE_STRUCT:
        return type_ptr + 1;
    default:
        return NULL;
    }
}

void thunk_register_struct(int id, const char *name, const argtype *types)
{
    const argtype *type_ptr;
    StructEntry *se;
    int nb_fields, offset, max_align, align, size, i, j;

    se = struct_entries + id;
    
    /* first we count the number of fields */
    type_ptr = types;
    nb_fields = 0;
    while (*type_ptr != TYPE_NULL) {
        type_ptr = thunk_type_next(type_ptr);
        nb_fields++;
    }
    se->field_types = types;
    se->nb_fields = nb_fields;
    se->name = name;
#ifdef DEBUG
    printf("struct %s: id=%d nb_fields=%d\n", 
           se->name, id, se->nb_fields);
#endif
    /* now we can alloc the data */

    for(i = 0;i < 2; i++) {
        offset = 0;
        max_align = 1;
        se->field_offsets[i] = malloc(nb_fields * sizeof(int));
        type_ptr = se->field_types;
        for(j = 0;j < nb_fields; j++) {
            size = thunk_type_size(type_ptr, i);
            align = thunk_type_align(type_ptr, i);
            offset = (offset + align - 1) & ~(align - 1);
            se->field_offsets[i][j] = offset;
            offset += size;
            if (align > max_align)
                max_align = align;
            type_ptr = thunk_type_next(type_ptr);
        }
        offset = (offset + max_align - 1) & ~(max_align - 1);
        se->size[i] = offset;
        se->align[i] = max_align;
#ifdef DEBUG
        printf("%s: size=%d align=%d\n", 
               i == THUNK_HOST ? "host" : "target", offset, max_align);
#endif
    }
}

void thunk_register_struct_direct(int id, const char *name, StructEntry *se1)
{
    StructEntry *se;
    se = struct_entries + id;
    *se = *se1;
    se->name = name;
}


/* now we can define the main conversion functions */
const argtype *thunk_convert(void *dst, const void *src, 
                             const argtype *type_ptr, int to_host)
{
    int type;

    type = *type_ptr++;
    switch(type) {
    case TYPE_CHAR:
        *(uint8_t *)dst = *(uint8_t *)src;
        break;
    case TYPE_SHORT:
        *(uint16_t *)dst = tswap16(*(uint16_t *)src);
        break;
    case TYPE_INT:
        *(uint32_t *)dst = tswap32(*(uint32_t *)src);
        break;
    case TYPE_LONGLONG:
    case TYPE_ULONGLONG:
        *(uint64_t *)dst = tswap64(*(uint64_t *)src);
        break;
#if HOST_LONG_BITS == 32 && TARGET_LONG_BITS == 32
    case TYPE_LONG:
    case TYPE_ULONG:
    case TYPE_PTRVOID:
        *(uint32_t *)dst = tswap32(*(uint32_t *)src);
        break;
#elif HOST_LONG_BITS == 64 && TARGET_LONG_BITS == 32
    case TYPE_LONG:
    case TYPE_ULONG:
    case TYPE_PTRVOID:
        if (to_host) {
            *(uint64_t *)dst = tswap32(*(uint32_t *)src);
        } else {
            *(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff);
        }
        break;
#else
#warning unsupported conversion
#endif
    case TYPE_ARRAY:
        {
            int array_length, i, dst_size, src_size;
            const uint8_t *s;
            uint8_t  *d;

            array_length = *type_ptr++;
            dst_size = thunk_type_size(type_ptr, to_host);
            src_size = thunk_type_size(type_ptr, 1 - to_host);
            d = dst;
            s = src;
            for(i = 0;i < array_length; i++) {
                thunk_convert(d, s, type_ptr, to_host);
                d += dst_size;
                s += src_size;
            }
            type_ptr = thunk_type_next(type_ptr);
        }
        break;
    case TYPE_STRUCT:
        {
            int i;
            const StructEntry *se;
            const uint8_t *s;
            uint8_t  *d;
            const argtype *field_types;
            const int *dst_offsets, *src_offsets;
            
            se = struct_entries + *type_ptr++;
            if (se->convert[0] != NULL) {
                /* specific conversion is needed */
                (*se->convert[to_host])(dst, src);
            } else {
                /* standard struct conversion */
                field_types = se->field_types;
                dst_offsets = se->field_offsets[to_host];
                src_offsets = se->field_offsets[1 - to_host];
                d = dst;
                s = src;
                for(i = 0;i < se->nb_fields; i++) {
                    field_types = thunk_convert(d + dst_offsets[i], 
                                                s + src_offsets[i], 
                                                field_types, to_host);
                }
            }
        }
        break;
    default:
        fprintf(stderr, "Invalid type 0x%x\n", type);
        break;
    }
    return type_ptr;
}

/* from em86 */

/* Utility function: Table-driven functions to translate bitmasks
 * between X86 and Alpha formats...
 */
unsigned int target_to_host_bitmask(unsigned int x86_mask, 
                                    bitmask_transtbl * trans_tbl)
{
    bitmask_transtbl *	btp;
    unsigned int	alpha_mask = 0;

    for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
	if((x86_mask & btp->x86_mask) == btp->x86_bits) {
	    alpha_mask |= btp->alpha_bits;
	}
    }
    return(alpha_mask);
}

unsigned int host_to_target_bitmask(unsigned int alpha_mask, 
                                    bitmask_transtbl * trans_tbl)
{
    bitmask_transtbl *	btp;
    unsigned int	x86_mask = 0;

    for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
	if((alpha_mask & btp->alpha_mask) == btp->alpha_bits) {
	    x86_mask |= btp->x86_bits;
	}
    }
    return(x86_mask);
}
Commit	Line	Data
31e31b8a FB	1	/*
	2	* Generic thunking code to convert data between host and target CPU
	3	*
	4	* Copyright (c) 2003 Fabrice Bellard
	5	*
3ef693a0 FB	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
31e31b8a	10	*
3ef693a0 FB	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
31e31b8a	15	*
3ef693a0 FB	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31e31b8a FB	19	*/
	20	#include <stdlib.h>
	21	#include <stdio.h>
	22	#include <stdarg.h>
	23
3ef693a0	24	#include "qemu.h"
31e31b8a FB	25	#include "thunk.h"
	26
	27	//#define DEBUG
	28
	29	#define MAX_STRUCTS 128
	30
	31	/* XXX: make it dynamic */
24374901	32	StructEntry struct_entries[MAX_STRUCTS];
31e31b8a FB	33
	34	static inline const argtype thunk_type_next(const argtype type_ptr)
	35	{
	36	int type;
	37
	38	type = *type_ptr++;
	39	switch(type) {
	40	case TYPE_CHAR:
	41	case TYPE_SHORT:
	42	case TYPE_INT:
	43	case TYPE_LONGLONG:
	44	case TYPE_ULONGLONG:
	45	case TYPE_LONG:
	46	case TYPE_ULONG:
	47	case TYPE_PTRVOID:
	48	return type_ptr;
	49	case TYPE_PTR:
	50	return thunk_type_next(type_ptr);
	51	case TYPE_ARRAY:
	52	return thunk_type_next(type_ptr + 1);
	53	case TYPE_STRUCT:
	54	return type_ptr + 1;
	55	default:
	56	return NULL;
	57	}
	58	}
	59
	60	void thunk_register_struct(int id, const char name, const argtype types)
	61	{
	62	const argtype *type_ptr;
	63	StructEntry *se;
	64	int nb_fields, offset, max_align, align, size, i, j;
	65
	66	se = struct_entries + id;
	67
	68	/* first we count the number of fields */
	69	type_ptr = types;
	70	nb_fields = 0;
	71	while (*type_ptr != TYPE_NULL) {
	72	type_ptr = thunk_type_next(type_ptr);
	73	nb_fields++;
	74	}
	75	se->field_types = types;
	76	se->nb_fields = nb_fields;
	77	se->name = name;
	78	#ifdef DEBUG
	79	printf("struct %s: id=%d nb_fields=%d\n",
	80	se->name, id, se->nb_fields);
	81	#endif
	82	/* now we can alloc the data */
	83
	84	for(i = 0;i < 2; i++) {
	85	offset = 0;
	86	max_align = 1;
	87	se->field_offsets[i] = malloc(nb_fields * sizeof(int));
	88	type_ptr = se->field_types;
	89	for(j = 0;j < nb_fields; j++) {
	90	size = thunk_type_size(type_ptr, i);
	91	align = thunk_type_align(type_ptr, i);
	92	offset = (offset + align - 1) & ~(align - 1);
	93	se->field_offsets[i][j] = offset;
	94	offset += size;
	95	if (align > max_align)
	96	max_align = align;
24374901	97	type_ptr = thunk_type_next(type_ptr);
31e31b8a FB	98	}
	99	offset = (offset + max_align - 1) & ~(max_align - 1);
	100	se->size[i] = offset;
	101	se->align[i] = max_align;
	102	#ifdef DEBUG
	103	printf("%s: size=%d align=%d\n",
	104	i == THUNK_HOST ? "host" : "target", offset, max_align);
	105	#endif
	106	}
	107	}
	108
	109	void thunk_register_struct_direct(int id, const char name, StructEntry se1)
	110	{
	111	StructEntry *se;
	112	se = struct_entries + id;
	113	se = se1;
	114	se->name = name;
	115	}
	116
	117
	118	/* now we can define the main conversion functions */
	119	const argtype thunk_convert(void dst, const void *src,
	120	const argtype *type_ptr, int to_host)
	121	{
	122	int type;
	123
	124	type = *type_ptr++;
	125	switch(type) {
	126	case TYPE_CHAR:
	127	(uint8_t )dst = (uint8_t )src;
	128	break;
	129	case TYPE_SHORT:
	130	(uint16_t )dst = tswap16((uint16_t )src);
	131	break;
	132	case TYPE_INT:
	133	(uint32_t )dst = tswap32((uint32_t )src);
	134	break;
	135	case TYPE_LONGLONG:
	136	case TYPE_ULONGLONG:
	137	(uint64_t )dst = tswap64((uint64_t )src);
	138	break;
	139	#if HOST_LONG_BITS == 32 && TARGET_LONG_BITS == 32
	140	case TYPE_LONG:
	141	case TYPE_ULONG:
	142	case TYPE_PTRVOID:
	143	(uint32_t )dst = tswap32((uint32_t )src);
	144	break;
	145	#elif HOST_LONG_BITS == 64 && TARGET_LONG_BITS == 32
	146	case TYPE_LONG:
	147	case TYPE_ULONG:
	148	case TYPE_PTRVOID:
d0cd3b8d	149	if (to_host) {
31e31b8a FB	150	(uint64_t )dst = tswap32((uint32_t )src);
	151	} else {
	152	(uint32_t )dst = tswap32((uint64_t )src & 0xffffffff);
	153	}
	154	break;
	155	#else
64b3ab24	156	#warning unsupported conversion
31e31b8a FB	157	#endif
	158	case TYPE_ARRAY:
	159	{
	160	int array_length, i, dst_size, src_size;
	161	const uint8_t *s;
	162	uint8_t *d;
	163
	164	array_length = *type_ptr++;
	165	dst_size = thunk_type_size(type_ptr, to_host);
	166	src_size = thunk_type_size(type_ptr, 1 - to_host);
	167	d = dst;
	168	s = src;
	169	for(i = 0;i < array_length; i++) {
	170	thunk_convert(d, s, type_ptr, to_host);
	171	d += dst_size;
	172	s += src_size;
	173	}
	174	type_ptr = thunk_type_next(type_ptr);
	175	}
	176	break;
	177	case TYPE_STRUCT:
	178	{
	179	int i;
	180	const StructEntry *se;
	181	const uint8_t *s;
	182	uint8_t *d;
	183	const argtype *field_types;
	184	const int dst_offsets, src_offsets;
	185
	186	se = struct_entries + *type_ptr++;
	187	if (se->convert[0] != NULL) {
	188	/* specific conversion is needed */
	189	(*se->convert[to_host])(dst, src);
	190	} else {
	191	/* standard struct conversion */
	192	field_types = se->field_types;
	193	dst_offsets = se->field_offsets[to_host];
	194	src_offsets = se->field_offsets[1 - to_host];
	195	d = dst;
	196	s = src;
	197	for(i = 0;i < se->nb_fields; i++) {
	198	field_types = thunk_convert(d + dst_offsets[i],
	199	s + src_offsets[i],
	200	field_types, to_host);
	201	}
	202	}
	203	}
	204	break;
	205	default:
	206	fprintf(stderr, "Invalid type 0x%x\n", type);
	207	break;
	208	}
	209	return type_ptr;
	210	}
	211
	212	/* from em86 */
	213
	214	/* Utility function: Table-driven functions to translate bitmasks
	215	* between X86 and Alpha formats...
	216	*/
	217	unsigned int target_to_host_bitmask(unsigned int x86_mask,
	218	bitmask_transtbl * trans_tbl)
	219	{
	220	bitmask_transtbl * btp;
221	unsigned int alpha_mask = 0;
222
223	for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
224	if((x86_mask & btp->x86_mask) == btp->x86_bits) {
225	alpha_mask \|= btp->alpha_bits;
226	}
227	}
228	return(alpha_mask);
229	}
230
231	unsigned int host_to_target_bitmask(unsigned int alpha_mask,
232	bitmask_transtbl * trans_tbl)
233	{
234	bitmask_transtbl * btp;
235	unsigned int x86_mask = 0;
236
237	for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
238	if((alpha_mask & btp->alpha_mask) == btp->alpha_bits) {
7a987127	239	x86_mask \|= btp->x86_bits;
31e31b8a FB	240	}
	241	}
	242	return(x86_mask);
	243	}