root / thunk.h @ 95d65800
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/*
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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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#ifndef THUNK_H
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#define THUNK_H
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#include <inttypes.h> |
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#include "cpu.h" |
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/* types enums definitions */
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typedef enum argtype { |
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TYPE_NULL, |
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TYPE_CHAR, |
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TYPE_SHORT, |
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TYPE_INT, |
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TYPE_LONG, |
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TYPE_ULONG, |
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TYPE_PTRVOID, /* pointer on unknown data */
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TYPE_LONGLONG, |
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TYPE_ULONGLONG, |
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TYPE_PTR, |
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TYPE_ARRAY, |
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TYPE_STRUCT, |
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TYPE_OLDDEVT, |
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} argtype; |
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#define MK_PTR(type) TYPE_PTR, type
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#define MK_ARRAY(type, size) TYPE_ARRAY, size, type
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#define MK_STRUCT(id) TYPE_STRUCT, id
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#define THUNK_TARGET 0 |
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#define THUNK_HOST 1 |
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typedef struct { |
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/* standard struct handling */
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const argtype *field_types;
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int nb_fields;
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int *field_offsets[2]; |
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/* special handling */
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void (*convert[2])(void *dst, const void *src); |
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int size[2]; |
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int align[2]; |
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const char *name; |
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} StructEntry; |
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/* Translation table for bitmasks... */
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typedef struct bitmask_transtbl { |
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unsigned int x86_mask; |
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unsigned int x86_bits; |
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unsigned int alpha_mask; |
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unsigned int alpha_bits; |
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} bitmask_transtbl; |
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void thunk_register_struct(int id, const char *name, const argtype *types); |
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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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const argtype *thunk_convert(void *dst, const void *src, |
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const argtype *type_ptr, int to_host); |
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#ifndef NO_THUNK_TYPE_SIZE
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extern StructEntry struct_entries[];
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int thunk_type_size_array(const argtype *type_ptr, int is_host); |
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int thunk_type_align_array(const argtype *type_ptr, int is_host); |
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static inline int thunk_type_size(const argtype *type_ptr, int is_host) |
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{ |
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int type, size;
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const StructEntry *se;
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type = *type_ptr; |
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switch(type) {
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case TYPE_CHAR:
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return 1; |
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case TYPE_SHORT:
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return 2; |
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case TYPE_INT:
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return 4; |
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case TYPE_LONGLONG:
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case TYPE_ULONGLONG:
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return 8; |
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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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case TYPE_PTR:
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if (is_host) {
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return sizeof(void *); |
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} else {
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return TARGET_ABI_BITS / 8; |
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} |
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break;
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case TYPE_OLDDEVT:
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if (is_host) {
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#if defined(HOST_X86_64)
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return 8; |
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#elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
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defined(HOST_PARISC) || defined(HOST_SPARC64) |
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return 4; |
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#elif defined(HOST_PPC)
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return sizeof(void *); |
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#else
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return 2; |
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#endif
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} else {
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#if defined(TARGET_X86_64)
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return 8; |
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#elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
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defined(TARGET_PARISC) || defined(TARGET_SPARC64) |
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return 4; |
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#elif defined(TARGET_PPC)
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return TARGET_ABI_BITS / 8; |
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#else
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return 2; |
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#endif
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} |
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break;
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case TYPE_ARRAY:
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size = type_ptr[1];
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return size * thunk_type_size_array(type_ptr + 2, is_host); |
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case TYPE_STRUCT:
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se = struct_entries + type_ptr[1];
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return se->size[is_host];
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default:
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return -1; |
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} |
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} |
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static inline int thunk_type_align(const argtype *type_ptr, int is_host) |
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{ |
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int type;
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const StructEntry *se;
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type = *type_ptr; |
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switch(type) {
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case TYPE_CHAR:
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return 1; |
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case TYPE_SHORT:
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return 2; |
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case TYPE_INT:
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return 4; |
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case TYPE_LONGLONG:
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case TYPE_ULONGLONG:
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return 8; |
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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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case TYPE_PTR:
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if (is_host) {
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return sizeof(void *); |
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} else {
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return TARGET_ABI_BITS / 8; |
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} |
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break;
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case TYPE_OLDDEVT:
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return thunk_type_size(type_ptr, is_host);
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case TYPE_ARRAY:
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return thunk_type_align_array(type_ptr + 2, is_host); |
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case TYPE_STRUCT:
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se = struct_entries + type_ptr[1];
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return se->align[is_host];
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default:
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return -1; |
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} |
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} |
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#endif /* NO_THUNK_TYPE_SIZE */ |
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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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unsigned int host_to_target_bitmask(unsigned int alpha_mask, |
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const bitmask_transtbl * trans_tbl);
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#endif
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