[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 "qemu/osdep.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 host and target formats
 */
unsigned int target_to_host_bitmask(unsigned int target_mask,
                                    const bitmask_transtbl * trans_tbl)
{
    const bitmask_transtbl *btp;
    unsigned int host_mask = 0;

    for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
        if ((target_mask & btp->target_mask) == btp->target_bits) {
            host_mask |= btp->host_bits;
        }
    }
    return host_mask;
}

unsigned int host_to_target_bitmask(unsigned int host_mask,
                                    const bitmask_transtbl * trans_tbl)
{
    const bitmask_transtbl *btp;
    unsigned int target_mask = 0;

    for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
        if ((host_mask & btp->host_mask) == btp->host_bits) {
            target_mask |= btp->target_bits;
        }
    }
    return target_mask;
}

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);
}

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	18	*/
d38ea87a	19	#include "qemu/osdep.h"
31e31b8a	20
3ef693a0	21	#include "qemu.h"
022c62cb	22	#include "exec/user/thunk.h"
31e31b8a FB	23
	24	//#define DEBUG
	25
8be656b8 AG	26	static unsigned int max_struct_entries;
8be656b8 AG	27	StructEntry *struct_entries;
31e31b8a	28
26553115 JM	29	static const argtype thunk_type_next_ptr(const argtype type_ptr);
26553115 JM	30
31e31b8a FB	31	static inline const argtype thunk_type_next(const argtype type_ptr)
	32	{
	33	int type;
	34
	35	type = *type_ptr++;
	36	switch(type) {
	37	case TYPE_CHAR:
	38	case TYPE_SHORT:
	39	case TYPE_INT:
	40	case TYPE_LONGLONG:
	41	case TYPE_ULONGLONG:
	42	case TYPE_LONG:
	43	case TYPE_ULONG:
	44	case TYPE_PTRVOID:
6083abd9	45	case TYPE_OLDDEVT:
31e31b8a FB	46	return type_ptr;
31e31b8a FB	47	case TYPE_PTR:
26553115	48	return thunk_type_next_ptr(type_ptr);
31e31b8a	49	case TYPE_ARRAY:
26553115	50	return thunk_type_next_ptr(type_ptr + 1);
31e31b8a FB	51	case TYPE_STRUCT:
	52	return type_ptr + 1;
	53	default:
	54	return NULL;
	55	}
	56	}
	57
26553115 JM	58	static const argtype thunk_type_next_ptr(const argtype type_ptr)
	59	{
	60	return thunk_type_next(type_ptr);
	61	}
	62
31e31b8a FB	63	void thunk_register_struct(int id, const char name, const argtype types)
	64	{
	65	const argtype *type_ptr;
	66	StructEntry *se;
	67	int nb_fields, offset, max_align, align, size, i, j;
	68
8be656b8	69	assert(id < max_struct_entries);
31e31b8a	70	se = struct_entries + id;
3b46e624	71
31e31b8a FB	72	/* first we count the number of fields */
	73	type_ptr = types;
	74	nb_fields = 0;
	75	while (*type_ptr != TYPE_NULL) {
	76	type_ptr = thunk_type_next(type_ptr);
	77	nb_fields++;
	78	}
	79	se->field_types = types;
	80	se->nb_fields = nb_fields;
	81	se->name = name;
	82	#ifdef DEBUG
5fafdf24	83	printf("struct %s: id=%d nb_fields=%d\n",
31e31b8a FB	84	se->name, id, se->nb_fields);
	85	#endif
	86	/* now we can alloc the data */
	87
	88	for(i = 0;i < 2; i++) {
	89	offset = 0;
	90	max_align = 1;
	91	se->field_offsets[i] = malloc(nb_fields * sizeof(int));
	92	type_ptr = se->field_types;
	93	for(j = 0;j < nb_fields; j++) {
	94	size = thunk_type_size(type_ptr, i);
	95	align = thunk_type_align(type_ptr, i);
	96	offset = (offset + align - 1) & ~(align - 1);
	97	se->field_offsets[i][j] = offset;
	98	offset += size;
	99	if (align > max_align)
	100	max_align = align;
24374901	101	type_ptr = thunk_type_next(type_ptr);
31e31b8a FB	102	}
	103	offset = (offset + max_align - 1) & ~(max_align - 1);
	104	se->size[i] = offset;
	105	se->align[i] = max_align;
	106	#ifdef DEBUG
5fafdf24	107	printf("%s: size=%d align=%d\n",
31e31b8a FB	108	i == THUNK_HOST ? "host" : "target", offset, max_align);
	109	#endif
	110	}
	111	}
	112
8e853dc7 BS	113	void thunk_register_struct_direct(int id, const char *name,
8e853dc7 BS	114	const StructEntry *se1)
31e31b8a FB	115	{
31e31b8a FB	116	StructEntry *se;
8be656b8 AG	117
8be656b8 AG	118	assert(id < max_struct_entries);
31e31b8a FB	119	se = struct_entries + id;
	120	se = se1;
	121	se->name = name;
	122	}
	123
	124
	125	/* now we can define the main conversion functions */
5fafdf24	126	const argtype thunk_convert(void dst, const void *src,
31e31b8a FB	127	const argtype *type_ptr, int to_host)
	128	{
	129	int type;
	130
	131	type = *type_ptr++;
	132	switch(type) {
	133	case TYPE_CHAR:
	134	(uint8_t )dst = (uint8_t )src;
	135	break;
	136	case TYPE_SHORT:
	137	(uint16_t )dst = tswap16((uint16_t )src);
	138	break;
	139	case TYPE_INT:
	140	(uint32_t )dst = tswap32((uint32_t )src);
	141	break;
	142	case TYPE_LONGLONG:
	143	case TYPE_ULONGLONG:
	144	(uint64_t )dst = tswap64((uint64_t )src);
	145	break;
992f48a0	146	#if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32
31e31b8a FB	147	case TYPE_LONG:
	148	case TYPE_ULONG:
	149	case TYPE_PTRVOID:
	150	(uint32_t )dst = tswap32((uint32_t )src);
	151	break;
992f48a0	152	#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32
31e31b8a FB	153	case TYPE_LONG:
	154	case TYPE_ULONG:
	155	case TYPE_PTRVOID:
d0cd3b8d	156	if (to_host) {
70499c98 FB	157	if (type == TYPE_LONG) {
	158	/* sign extension */
	159	(uint64_t )dst = (int32_t)tswap32((uint32_t )src);
	160	} else {
	161	(uint64_t )dst = tswap32((uint32_t )src);
	162	}
31e31b8a FB	163	} else {
	164	(uint32_t )dst = tswap32((uint64_t )src & 0xffffffff);
	165	}
	166	break;
70499c98 FB	167	#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
	168	case TYPE_LONG:
	169	case TYPE_ULONG:
	170	case TYPE_PTRVOID:
	171	(uint64_t )dst = tswap64((uint64_t )src);
	172	break;
	173	#elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64
	174	case TYPE_LONG:
	175	case TYPE_ULONG:
	176	case TYPE_PTRVOID:
	177	if (to_host) {
	178	(uint32_t )dst = tswap64((uint64_t )src);
	179	} else {
	180	if (type == TYPE_LONG) {
	181	/* sign extension */
	182	(uint64_t )dst = tswap64((int32_t )src);
	183	} else {
	184	(uint64_t )dst = tswap64((uint32_t )src);
	185	}
	186	}
	187	break;
31e31b8a	188	#else
64b3ab24	189	#warning unsupported conversion
31e31b8a	190	#endif
6083abd9 AG	191	case TYPE_OLDDEVT:
	192	{
	193	uint64_t val = 0;
	194	switch (thunk_type_size(type_ptr - 1, !to_host)) {
	195	case 2:
	196	val = (uint16_t )src;
	197	break;
	198	case 4:
	199	val = (uint32_t )src;
	200	break;
	201	case 8:
	202	val = (uint64_t )src;
	203	break;
	204	}
	205	switch (thunk_type_size(type_ptr - 1, to_host)) {
	206	case 2:
	207	(uint16_t )dst = tswap16(val);
	208	break;
	209	case 4:
	210	(uint32_t )dst = tswap32(val);
	211	break;
	212	case 8:
	213	(uint64_t )dst = tswap64(val);
	214	break;
	215	}
	216	break;
	217	}
31e31b8a FB	218	case TYPE_ARRAY:
	219	{
	220	int array_length, i, dst_size, src_size;
	221	const uint8_t *s;
	222	uint8_t *d;
	223
	224	array_length = *type_ptr++;
	225	dst_size = thunk_type_size(type_ptr, to_host);
	226	src_size = thunk_type_size(type_ptr, 1 - to_host);
	227	d = dst;
	228	s = src;
	229	for(i = 0;i < array_length; i++) {
	230	thunk_convert(d, s, type_ptr, to_host);
	231	d += dst_size;
	232	s += src_size;
	233	}
	234	type_ptr = thunk_type_next(type_ptr);
	235	}
	236	break;
	237	case TYPE_STRUCT:
	238	{
	239	int i;
	240	const StructEntry *se;
	241	const uint8_t *s;
	242	uint8_t *d;
	243	const argtype *field_types;
	244	const int dst_offsets, src_offsets;
3b46e624	245
8be656b8	246	assert(*type_ptr < max_struct_entries);
31e31b8a FB	247	se = struct_entries + *type_ptr++;
	248	if (se->convert[0] != NULL) {
	249	/* specific conversion is needed */
	250	(*se->convert[to_host])(dst, src);
	251	} else {
	252	/* standard struct conversion */
	253	field_types = se->field_types;
	254	dst_offsets = se->field_offsets[to_host];
	255	src_offsets = se->field_offsets[1 - to_host];
	256	d = dst;
	257	s = src;
	258	for(i = 0;i < se->nb_fields; i++) {
5fafdf24 TS	259	field_types = thunk_convert(d + dst_offsets[i],
5fafdf24 TS	260	s + src_offsets[i],
31e31b8a FB	261	field_types, to_host);
	262	}
	263	}
	264	}
	265	break;
	266	default:
	267	fprintf(stderr, "Invalid type 0x%x\n", type);
	268	break;
	269	}
	270	return type_ptr;
	271	}
	272
	273	/* from em86 */
	274
	275	/* Utility function: Table-driven functions to translate bitmasks
e0ca2ed5	276	* between host and target formats
31e31b8a	277	*/
e0ca2ed5	278	unsigned int target_to_host_bitmask(unsigned int target_mask,
b39bc503	279	const bitmask_transtbl * trans_tbl)
31e31b8a	280	{
b39bc503	281	const bitmask_transtbl *btp;
e0ca2ed5	282	unsigned int host_mask = 0;
31e31b8a	283
e0ca2ed5 PM	284	for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
	285	if ((target_mask & btp->target_mask) == btp->target_bits) {
	286	host_mask \|= btp->host_bits;
	287	}
31e31b8a	288	}
e0ca2ed5	289	return host_mask;
31e31b8a FB	290	}
31e31b8a FB	291
e0ca2ed5	292	unsigned int host_to_target_bitmask(unsigned int host_mask,
b39bc503	293	const bitmask_transtbl * trans_tbl)
31e31b8a	294	{
b39bc503	295	const bitmask_transtbl *btp;
e0ca2ed5	296	unsigned int target_mask = 0;
31e31b8a	297
e0ca2ed5 PM	298	for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
	299	if ((host_mask & btp->host_mask) == btp->host_bits) {
	300	target_mask \|= btp->target_bits;
	301	}
31e31b8a	302	}
e0ca2ed5	303	return target_mask;
31e31b8a	304	}
26553115	305
26553115 JM	306	int thunk_type_size_array(const argtype *type_ptr, int is_host)
	307	{
	308	return thunk_type_size(type_ptr, is_host);
	309	}
	310
	311	int thunk_type_align_array(const argtype *type_ptr, int is_host)
	312	{
	313	return thunk_type_align(type_ptr, is_host);
	314	}
8be656b8 AG	315
	316	void thunk_init(unsigned int max_structs)
	317	{
	318	max_struct_entries = max_structs;
	319	struct_entries = g_new0(StructEntry, max_structs);
	320	}