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289 lines
8.2 KiB
C
289 lines
8.2 KiB
C
/*
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* Generic thunking code to convert data between host and target CPU
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include "qemu.h"
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#include "thunk.h"
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//#define DEBUG
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#define MAX_STRUCTS 128
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/* XXX: make it dynamic */
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StructEntry struct_entries[MAX_STRUCTS];
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static const argtype *thunk_type_next_ptr(const argtype *type_ptr);
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static inline const argtype *thunk_type_next(const argtype *type_ptr)
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{
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int type;
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type = *type_ptr++;
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switch(type) {
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case TYPE_CHAR:
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case TYPE_SHORT:
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case TYPE_INT:
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case TYPE_LONGLONG:
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case TYPE_ULONGLONG:
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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return type_ptr;
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case TYPE_PTR:
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return thunk_type_next_ptr(type_ptr);
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case TYPE_ARRAY:
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return thunk_type_next_ptr(type_ptr + 1);
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case TYPE_STRUCT:
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return type_ptr + 1;
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default:
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return NULL;
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}
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}
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static const argtype *thunk_type_next_ptr(const argtype *type_ptr)
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{
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return thunk_type_next(type_ptr);
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}
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void thunk_register_struct(int id, const char *name, const argtype *types)
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{
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const argtype *type_ptr;
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StructEntry *se;
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int nb_fields, offset, max_align, align, size, i, j;
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se = struct_entries + id;
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/* first we count the number of fields */
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type_ptr = types;
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nb_fields = 0;
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while (*type_ptr != TYPE_NULL) {
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type_ptr = thunk_type_next(type_ptr);
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nb_fields++;
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}
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se->field_types = types;
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se->nb_fields = nb_fields;
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se->name = name;
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#ifdef DEBUG
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printf("struct %s: id=%d nb_fields=%d\n",
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se->name, id, se->nb_fields);
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#endif
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/* now we can alloc the data */
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for(i = 0;i < 2; i++) {
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offset = 0;
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max_align = 1;
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se->field_offsets[i] = malloc(nb_fields * sizeof(int));
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type_ptr = se->field_types;
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for(j = 0;j < nb_fields; j++) {
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size = thunk_type_size(type_ptr, i);
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align = thunk_type_align(type_ptr, i);
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offset = (offset + align - 1) & ~(align - 1);
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se->field_offsets[i][j] = offset;
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offset += size;
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if (align > max_align)
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max_align = align;
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type_ptr = thunk_type_next(type_ptr);
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}
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offset = (offset + max_align - 1) & ~(max_align - 1);
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se->size[i] = offset;
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se->align[i] = max_align;
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#ifdef DEBUG
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printf("%s: size=%d align=%d\n",
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i == THUNK_HOST ? "host" : "target", offset, max_align);
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#endif
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}
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}
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void thunk_register_struct_direct(int id, const char *name,
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const StructEntry *se1)
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{
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StructEntry *se;
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se = struct_entries + id;
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*se = *se1;
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se->name = name;
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}
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/* now we can define the main conversion functions */
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const argtype *thunk_convert(void *dst, const void *src,
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const argtype *type_ptr, int to_host)
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{
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int type;
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type = *type_ptr++;
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switch(type) {
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case TYPE_CHAR:
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*(uint8_t *)dst = *(uint8_t *)src;
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break;
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case TYPE_SHORT:
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*(uint16_t *)dst = tswap16(*(uint16_t *)src);
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break;
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case TYPE_INT:
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*(uint32_t *)dst = tswap32(*(uint32_t *)src);
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break;
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case TYPE_LONGLONG:
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case TYPE_ULONGLONG:
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*(uint64_t *)dst = tswap64(*(uint64_t *)src);
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break;
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#if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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*(uint32_t *)dst = tswap32(*(uint32_t *)src);
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break;
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#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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if (to_host) {
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if (type == TYPE_LONG) {
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/* sign extension */
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*(uint64_t *)dst = (int32_t)tswap32(*(uint32_t *)src);
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} else {
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*(uint64_t *)dst = tswap32(*(uint32_t *)src);
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}
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} else {
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*(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff);
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}
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break;
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#elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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*(uint64_t *)dst = tswap64(*(uint64_t *)src);
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break;
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#elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64
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case TYPE_LONG:
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case TYPE_ULONG:
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case TYPE_PTRVOID:
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if (to_host) {
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*(uint32_t *)dst = tswap64(*(uint64_t *)src);
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} else {
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if (type == TYPE_LONG) {
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/* sign extension */
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*(uint64_t *)dst = tswap64(*(int32_t *)src);
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} else {
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*(uint64_t *)dst = tswap64(*(uint32_t *)src);
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}
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}
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break;
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#else
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#warning unsupported conversion
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#endif
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case TYPE_ARRAY:
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{
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int array_length, i, dst_size, src_size;
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const uint8_t *s;
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uint8_t *d;
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array_length = *type_ptr++;
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dst_size = thunk_type_size(type_ptr, to_host);
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src_size = thunk_type_size(type_ptr, 1 - to_host);
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d = dst;
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s = src;
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for(i = 0;i < array_length; i++) {
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thunk_convert(d, s, type_ptr, to_host);
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d += dst_size;
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s += src_size;
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}
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type_ptr = thunk_type_next(type_ptr);
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}
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break;
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case TYPE_STRUCT:
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{
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int i;
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const StructEntry *se;
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const uint8_t *s;
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uint8_t *d;
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const argtype *field_types;
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const int *dst_offsets, *src_offsets;
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se = struct_entries + *type_ptr++;
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if (se->convert[0] != NULL) {
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/* specific conversion is needed */
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(*se->convert[to_host])(dst, src);
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} else {
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/* standard struct conversion */
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field_types = se->field_types;
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dst_offsets = se->field_offsets[to_host];
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src_offsets = se->field_offsets[1 - to_host];
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d = dst;
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s = src;
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for(i = 0;i < se->nb_fields; i++) {
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field_types = thunk_convert(d + dst_offsets[i],
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s + src_offsets[i],
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field_types, to_host);
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}
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}
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}
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break;
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default:
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fprintf(stderr, "Invalid type 0x%x\n", type);
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break;
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}
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return type_ptr;
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}
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/* from em86 */
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/* Utility function: Table-driven functions to translate bitmasks
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* between X86 and Alpha formats...
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*/
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unsigned int target_to_host_bitmask(unsigned int x86_mask,
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const bitmask_transtbl * trans_tbl)
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{
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const bitmask_transtbl *btp;
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unsigned int alpha_mask = 0;
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for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
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if((x86_mask & btp->x86_mask) == btp->x86_bits) {
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alpha_mask |= btp->alpha_bits;
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}
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}
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return(alpha_mask);
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}
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unsigned int host_to_target_bitmask(unsigned int alpha_mask,
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const bitmask_transtbl * trans_tbl)
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{
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const bitmask_transtbl *btp;
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unsigned int x86_mask = 0;
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for(btp = trans_tbl; btp->x86_mask && btp->alpha_mask; btp++) {
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if((alpha_mask & btp->alpha_mask) == btp->alpha_bits) {
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x86_mask |= btp->x86_bits;
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}
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}
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return(x86_mask);
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}
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#ifndef NO_THUNK_TYPE_SIZE
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int thunk_type_size_array(const argtype *type_ptr, int is_host)
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{
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return thunk_type_size(type_ptr, is_host);
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}
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int thunk_type_align_array(const argtype *type_ptr, int is_host)
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{
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return thunk_type_align(type_ptr, is_host);
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}
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#endif /* ndef NO_THUNK_TYPE_SIZE */
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