[mirror_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, see <http://www.gnu.org/licenses/>.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

#include "qemu.h"
#include "exec/user/thunk.h"

//#define DEBUG

static unsigned int max_struct_entries;
StructEntry *struct_entries;

static const argtype *thunk_type_next_ptr(const argtype *type_ptr);

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:
    case TYPE_OLDDEVT:
        return type_ptr;
    case TYPE_PTR:
        return thunk_type_next_ptr(type_ptr);
    case TYPE_ARRAY:
        return thunk_type_next_ptr(type_ptr + 1);
    case TYPE_STRUCT:
        return type_ptr + 1;
    default:
        return NULL;
    }
}

static const argtype *thunk_type_next_ptr(const argtype *type_ptr)
{
    return thunk_type_next(type_ptr);
}

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;

    assert(id < max_struct_entries);
    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,
                                  const StructEntry *se1)
{
    StructEntry *se;

    assert(id < max_struct_entries);
    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_ABI_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_ABI_BITS == 32
    case TYPE_LONG:
    case TYPE_ULONG:
    case TYPE_PTRVOID:
        if (to_host) {
            if (type == TYPE_LONG) {
                /* sign extension */
                *(uint64_t *)dst = (int32_t)tswap32(*(uint32_t *)src);
            } else {
                *(uint64_t *)dst = tswap32(*(uint32_t *)src);
            }
        } else {
            *(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff);
        }
        break;
#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
    case TYPE_LONG:
    case TYPE_ULONG:
    case TYPE_PTRVOID:
        *(uint64_t *)dst = tswap64(*(uint64_t *)src);
        break;
#elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64
    case TYPE_LONG:
    case TYPE_ULONG:
    case TYPE_PTRVOID:
        if (to_host) {
            *(uint32_t *)dst = tswap64(*(uint64_t *)src);
        } else {
            if (type == TYPE_LONG) {
                /* sign extension */
                *(uint64_t *)dst = tswap64(*(int32_t *)src);
            } else {
                *(uint64_t *)dst = tswap64(*(uint32_t *)src);
            }
        }
        break;
#else
#warning unsupported conversion
#endif
    case TYPE_OLDDEVT:
    {
        uint64_t val = 0;
        switch (thunk_type_size(type_ptr - 1, !to_host)) {
        case 2:
            val = *(uint16_t *)src;
            break;
        case 4:
            val = *(uint32_t *)src;
            break;
        case 8:
            val = *(uint64_t *)src;
            break;
        }
        switch (thunk_type_size(type_ptr - 1, to_host)) {
        case 2:
            *(uint16_t *)dst = tswap16(val);
            break;
        case 4:
            *(uint32_t *)dst = tswap32(val);
            break;
        case 8:
            *(uint64_t *)dst = tswap64(val);
            break;
        }
        break;
    }
    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;

            assert(*type_ptr < max_struct_entries);
            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,
                                    const bitmask_transtbl * trans_tbl)
{
    const 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,
                                    const bitmask_transtbl * trans_tbl)
{
    const 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);
}

#ifndef NO_THUNK_TYPE_SIZE
int thunk_type_size_array(const argtype *type_ptr, int is_host)
{
    return thunk_type_size(type_ptr, is_host);
}

int thunk_type_align_array(const argtype *type_ptr, int is_host)
{
    return thunk_type_align(type_ptr, is_host);
}
#endif /* ndef NO_THUNK_TYPE_SIZE */

void thunk_init(unsigned int max_structs)
{
    max_struct_entries = max_structs;
    struct_entries = g_new0(StructEntry, max_structs);
}
Commit	Line	Data
31e31b8a FB	1	/*
31e31b8a FB	2	* Generic thunking code to convert data between host and target CPU
5fafdf24	3	*
31e31b8a FB	4	* Copyright (c) 2003 Fabrice Bellard
31e31b8a FB	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	16	* You should have received a copy of the GNU Lesser General Public
8167ee88	17	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
31e31b8a FB	18	*/
	19	#include <stdlib.h>
	20	#include <stdio.h>
	21	#include <stdarg.h>
	22
3ef693a0	23	#include "qemu.h"
022c62cb	24	#include "exec/user/thunk.h"
31e31b8a FB	25
	26	//#define DEBUG
	27
8be656b8 AG	28	static unsigned int max_struct_entries;
8be656b8 AG	29	StructEntry *struct_entries;
31e31b8a	30
26553115 JM	31	static const argtype thunk_type_next_ptr(const argtype type_ptr);
26553115 JM	32
31e31b8a FB	33	static inline const argtype thunk_type_next(const argtype type_ptr)
	34	{
	35	int type;
	36
	37	type = *type_ptr++;
	38	switch(type) {
	39	case TYPE_CHAR:
	40	case TYPE_SHORT:
	41	case TYPE_INT:
	42	case TYPE_LONGLONG:
	43	case TYPE_ULONGLONG:
	44	case TYPE_LONG:
	45	case TYPE_ULONG:
	46	case TYPE_PTRVOID:
6083abd9	47	case TYPE_OLDDEVT:
31e31b8a FB	48	return type_ptr;
31e31b8a FB	49	case TYPE_PTR:
26553115	50	return thunk_type_next_ptr(type_ptr);
31e31b8a	51	case TYPE_ARRAY:
26553115	52	return thunk_type_next_ptr(type_ptr + 1);
31e31b8a FB	53	case TYPE_STRUCT:
	54	return type_ptr + 1;
	55	default:
	56	return NULL;
	57	}
	58	}
	59
26553115 JM	60	static const argtype thunk_type_next_ptr(const argtype type_ptr)
	61	{
	62	return thunk_type_next(type_ptr);
	63	}
	64
31e31b8a FB	65	void thunk_register_struct(int id, const char name, const argtype types)
	66	{
	67	const argtype *type_ptr;
	68	StructEntry *se;
	69	int nb_fields, offset, max_align, align, size, i, j;
	70
8be656b8	71	assert(id < max_struct_entries);
31e31b8a	72	se = struct_entries + id;
3b46e624	73
31e31b8a FB	74	/* first we count the number of fields */
	75	type_ptr = types;
	76	nb_fields = 0;
	77	while (*type_ptr != TYPE_NULL) {
	78	type_ptr = thunk_type_next(type_ptr);
	79	nb_fields++;
	80	}
	81	se->field_types = types;
	82	se->nb_fields = nb_fields;
	83	se->name = name;
	84	#ifdef DEBUG
5fafdf24	85	printf("struct %s: id=%d nb_fields=%d\n",
31e31b8a FB	86	se->name, id, se->nb_fields);
	87	#endif
	88	/* now we can alloc the data */
	89
	90	for(i = 0;i < 2; i++) {
	91	offset = 0;
	92	max_align = 1;
	93	se->field_offsets[i] = malloc(nb_fields * sizeof(int));
	94	type_ptr = se->field_types;
	95	for(j = 0;j < nb_fields; j++) {
	96	size = thunk_type_size(type_ptr, i);
	97	align = thunk_type_align(type_ptr, i);
	98	offset = (offset + align - 1) & ~(align - 1);
	99	se->field_offsets[i][j] = offset;
	100	offset += size;
	101	if (align > max_align)
	102	max_align = align;
24374901	103	type_ptr = thunk_type_next(type_ptr);
31e31b8a FB	104	}
	105	offset = (offset + max_align - 1) & ~(max_align - 1);
	106	se->size[i] = offset;
	107	se->align[i] = max_align;
	108	#ifdef DEBUG
5fafdf24	109	printf("%s: size=%d align=%d\n",
31e31b8a FB	110	i == THUNK_HOST ? "host" : "target", offset, max_align);
	111	#endif
	112	}
	113	}
	114
8e853dc7 BS	115	void thunk_register_struct_direct(int id, const char *name,
8e853dc7 BS	116	const StructEntry *se1)
31e31b8a FB	117	{
31e31b8a FB	118	StructEntry *se;
8be656b8 AG	119
8be656b8 AG	120	assert(id < max_struct_entries);
31e31b8a FB	121	se = struct_entries + id;
	122	se = se1;
	123	se->name = name;
	124	}
	125
	126
	127	/* now we can define the main conversion functions */
5fafdf24	128	const argtype thunk_convert(void dst, const void *src,
31e31b8a FB	129	const argtype *type_ptr, int to_host)
	130	{
	131	int type;
	132
	133	type = *type_ptr++;
	134	switch(type) {
	135	case TYPE_CHAR:
	136	(uint8_t )dst = (uint8_t )src;
	137	break;
	138	case TYPE_SHORT:
	139	(uint16_t )dst = tswap16((uint16_t )src);
	140	break;
	141	case TYPE_INT:
	142	(uint32_t )dst = tswap32((uint32_t )src);
	143	break;
	144	case TYPE_LONGLONG:
	145	case TYPE_ULONGLONG:
	146	(uint64_t )dst = tswap64((uint64_t )src);
	147	break;
992f48a0	148	#if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32
31e31b8a FB	149	case TYPE_LONG:
	150	case TYPE_ULONG:
	151	case TYPE_PTRVOID:
	152	(uint32_t )dst = tswap32((uint32_t )src);
	153	break;
992f48a0	154	#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32
31e31b8a FB	155	case TYPE_LONG:
	156	case TYPE_ULONG:
	157	case TYPE_PTRVOID:
d0cd3b8d	158	if (to_host) {
70499c98 FB	159	if (type == TYPE_LONG) {
	160	/* sign extension */
	161	(uint64_t )dst = (int32_t)tswap32((uint32_t )src);
	162	} else {
	163	(uint64_t )dst = tswap32((uint32_t )src);
	164	}
31e31b8a FB	165	} else {
	166	(uint32_t )dst = tswap32((uint64_t )src & 0xffffffff);
	167	}
	168	break;
70499c98 FB	169	#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
	170	case TYPE_LONG:
	171	case TYPE_ULONG:
	172	case TYPE_PTRVOID:
	173	(uint64_t )dst = tswap64((uint64_t )src);
	174	break;
	175	#elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64
	176	case TYPE_LONG:
	177	case TYPE_ULONG:
	178	case TYPE_PTRVOID:
	179	if (to_host) {
	180	(uint32_t )dst = tswap64((uint64_t )src);
	181	} else {
	182	if (type == TYPE_LONG) {
	183	/* sign extension */
	184	(uint64_t )dst = tswap64((int32_t )src);
	185	} else {
	186	(uint64_t )dst = tswap64((uint32_t )src);
	187	}
	188	}
	189	break;
31e31b8a	190	#else
64b3ab24	191	#warning unsupported conversion
31e31b8a	192	#endif
6083abd9 AG	193	case TYPE_OLDDEVT:
	194	{
	195	uint64_t val = 0;
	196	switch (thunk_type_size(type_ptr - 1, !to_host)) {
	197	case 2:
	198	val = (uint16_t )src;
	199	break;
	200	case 4:
	201	val = (uint32_t )src;
	202	break;
	203	case 8:
	204	val = (uint64_t )src;
	205	break;
	206	}
	207	switch (thunk_type_size(type_ptr - 1, to_host)) {
	208	case 2:
	209	(uint16_t )dst = tswap16(val);
	210	break;
	211	case 4:
	212	(uint32_t )dst = tswap32(val);
	213	break;
	214	case 8:
	215	(uint64_t )dst = tswap64(val);
	216	break;
	217	}
	218	break;
	219	}
31e31b8a FB	220	case TYPE_ARRAY:
	221	{
	222	int array_length, i, dst_size, src_size;
	223	const uint8_t *s;
	224	uint8_t *d;
	225
	226	array_length = *type_ptr++;
	227	dst_size = thunk_type_size(type_ptr, to_host);
	228	src_size = thunk_type_size(type_ptr, 1 - to_host);
	229	d = dst;
	230	s = src;
	231	for(i = 0;i < array_length; i++) {
	232	thunk_convert(d, s, type_ptr, to_host);
	233	d += dst_size;
	234	s += src_size;
	235	}
	236	type_ptr = thunk_type_next(type_ptr);
	237	}
	238	break;
	239	case TYPE_STRUCT:
	240	{
	241	int i;
	242	const StructEntry *se;
	243	const uint8_t *s;
	244	uint8_t *d;
	245	const argtype *field_types;
	246	const int dst_offsets, src_offsets;
3b46e624	247
8be656b8	248	assert(*type_ptr < max_struct_entries);
31e31b8a FB	249	se = struct_entries + *type_ptr++;
	250	if (se->convert[0] != NULL) {
	251	/* specific conversion is needed */
	252	(*se->convert[to_host])(dst, src);
	253	} else {
	254	/* standard struct conversion */
	255	field_types = se->field_types;
	256	dst_offsets = se->field_offsets[to_host];
	257	src_offsets = se->field_offsets[1 - to_host];
	258	d = dst;
	259	s = src;
	260	for(i = 0;i < se->nb_fields; i++) {
5fafdf24 TS	261	field_types = thunk_convert(d + dst_offsets[i],
5fafdf24 TS	262	s + src_offsets[i],
31e31b8a FB	263	field_types, to_host);
	264	}
	265	}
	266	}
	267	break;
	268	default:
	269	fprintf(stderr, "Invalid type 0x%x\n", type);
	270	break;
	271	}
	272	return type_ptr;
	273	}
	274
	275	/* from em86 */
	276
	277	/* Utility function: Table-driven functions to translate bitmasks
	278	* between X86 and Alpha formats...
	279	*/
5fafdf24	280	unsigned int target_to_host_bitmask(unsigned int x86_mask,
b39bc503	281	const bitmask_transtbl * trans_tbl)
31e31b8a	282	{
b39bc503	283	const bitmask_transtbl *btp;
31e31b8a FB	284	unsigned int alpha_mask = 0;
	285
	286	for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
	287	if((x86_mask & btp->x86_mask) == btp->x86_bits) {
	288	alpha_mask \|= btp->alpha_bits;
	289	}
	290	}
	291	return(alpha_mask);
	292	}
	293
5fafdf24	294	unsigned int host_to_target_bitmask(unsigned int alpha_mask,
b39bc503	295	const bitmask_transtbl * trans_tbl)
31e31b8a	296	{
b39bc503	297	const bitmask_transtbl *btp;
31e31b8a FB	298	unsigned int x86_mask = 0;
	299
	300	for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
	301	if((alpha_mask & btp->alpha_mask) == btp->alpha_bits) {
7a987127	302	x86_mask \|= btp->x86_bits;
31e31b8a FB	303	}
	304	}
	305	return(x86_mask);
	306	}
26553115 JM	307
	308	#ifndef NO_THUNK_TYPE_SIZE
	309	int thunk_type_size_array(const argtype *type_ptr, int is_host)
	310	{
	311	return thunk_type_size(type_ptr, is_host);
	312	}
	313
	314	int thunk_type_align_array(const argtype *type_ptr, int is_host)
	315	{
	316	return thunk_type_align(type_ptr, is_host);
	317	}
	318	#endif /* ndef NO_THUNK_TYPE_SIZE */
8be656b8 AG	319
	320	void thunk_init(unsigned int max_structs)
	321	{
	322	max_struct_entries = max_structs;
	323	struct_entries = g_new0(StructEntry, max_structs);
	324	}