thunk.h

   1 /*
   2  *  Generic thunking code to convert data between host and target CPU
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  */
  20 #ifndef THUNK_H
  21 #define THUNK_H
  22
  23 #include <inttypes.h>
  24 #include "cpu.h"
  25
  26 #include "bswap.h"
  27
  28 #if defined(WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
  29 #define BSWAP_NEEDED
  30 #endif
  31
  32 #ifdef BSWAP_NEEDED
  33
  34 static inline uint16_t tswap16(uint16_t s)
  35 {
  36     return bswap16(s);
  37 }
  38
  39 static inline uint32_t tswap32(uint32_t s)
  40 {
  41     return bswap32(s);
  42 }
  43
  44 static inline uint64_t tswap64(uint64_t s)
  45 {
  46     return bswap64(s);
  47 }
  48
  49 static inline void tswap16s(uint16_t *s)
  50 {
  51     *s = bswap16(*s);
  52 }
  53
  54 static inline void tswap32s(uint32_t *s)
  55 {
  56     *s = bswap32(*s);
  57 }
  58
  59 static inline void tswap64s(uint64_t *s)
  60 {
  61     *s = bswap64(*s);
  62 }
  63
  64 #else
  65
  66 static inline uint16_t tswap16(uint16_t s)
  67 {
  68     return s;
  69 }
  70
  71 static inline uint32_t tswap32(uint32_t s)
  72 {
  73     return s;
  74 }
  75
  76 static inline uint64_t tswap64(uint64_t s)
  77 {
  78     return s;
  79 }
  80
  81 static inline void tswap16s(uint16_t *s)
  82 {
  83 }
  84
  85 static inline void tswap32s(uint32_t *s)
  86 {
  87 }
  88
  89 static inline void tswap64s(uint64_t *s)
  90 {
  91 }
  92
  93 #endif
  94
  95 #if TARGET_LONG_SIZE == 4
  96 #define tswapl(s) tswap32(s)
  97 #define tswapls(s) tswap32s((uint32_t *)(s))
  98 #else
  99 #define tswapl(s) tswap64(s)
 100 #define tswapls(s) tswap64s((uint64_t *)(s))
 101 #endif
 102
 103 /* types enums definitions */
 104
 105 typedef enum argtype {
 106     TYPE_NULL,
 107     TYPE_CHAR,
 108     TYPE_SHORT,
 109     TYPE_INT,
 110     TYPE_LONG,
 111     TYPE_ULONG,
 112     TYPE_PTRVOID, /* pointer on unknown data */
 113     TYPE_LONGLONG,
 114     TYPE_ULONGLONG,
 115     TYPE_PTR,
 116     TYPE_ARRAY,
 117     TYPE_STRUCT,
 118 } argtype;
 119
 120 #define MK_PTR(type) TYPE_PTR, type
 121 #define MK_ARRAY(type, size) TYPE_ARRAY, size, type
 122 #define MK_STRUCT(id) TYPE_STRUCT, id
 123
 124 #define THUNK_TARGET 0
 125 #define THUNK_HOST   1
 126
 127 typedef struct {
 128     /* standard struct handling */
 129     const argtype *field_types;
 130     int nb_fields;
 131     int *field_offsets[2];
 132     /* special handling */
 133     void (*convert[2])(void *dst, const void *src);
 134     int size[2];
 135     int align[2];
 136     const char *name;
 137 } StructEntry;
 138
 139 /* Translation table for bitmasks... */
 140 typedef struct bitmask_transtbl {
 141         unsigned int    x86_mask;
 142         unsigned int    x86_bits;
 143         unsigned int    alpha_mask;
 144         unsigned int    alpha_bits;
 145 } bitmask_transtbl;
 146
 147 void thunk_register_struct(int id, const char *name, const argtype *types);
 148 void thunk_register_struct_direct(int id, const char *name, StructEntry *se1);
 149 const argtype *thunk_convert(void *dst, const void *src,
 150                              const argtype *type_ptr, int to_host);
 151 #ifndef NO_THUNK_TYPE_SIZE
 152
 153 extern StructEntry struct_entries[];
 154
 155 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
 156 {
 157     int type, size;
 158     const StructEntry *se;
 159
 160     type = *type_ptr;
 161     switch(type) {
 162     case TYPE_CHAR:
 163         return 1;
 164     case TYPE_SHORT:
 165         return 2;
 166     case TYPE_INT:
 167         return 4;
 168     case TYPE_LONGLONG:
 169     case TYPE_ULONGLONG:
 170         return 8;
 171     case TYPE_LONG:
 172     case TYPE_ULONG:
 173     case TYPE_PTRVOID:
 174     case TYPE_PTR:
 175         if (is_host) {
 176             return HOST_LONG_SIZE;
 177         } else {
 178             return TARGET_LONG_SIZE;
 179         }
 180         break;
 181     case TYPE_ARRAY:
 182         size = type_ptr[1];
 183         return size * thunk_type_size(type_ptr + 2, is_host);
 184     case TYPE_STRUCT:
 185         se = struct_entries + type_ptr[1];
 186         return se->size[is_host];
 187     default:
 188         return -1;
 189     }
 190 }
 191
 192 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 193 {
 194     int type;
 195     const StructEntry *se;
 196
 197     type = *type_ptr;
 198     switch(type) {
 199     case TYPE_CHAR:
 200         return 1;
 201     case TYPE_SHORT:
 202         return 2;
 203     case TYPE_INT:
 204         return 4;
 205     case TYPE_LONGLONG:
 206     case TYPE_ULONGLONG:
 207         return 8;
 208     case TYPE_LONG:
 209     case TYPE_ULONG:
 210     case TYPE_PTRVOID:
 211     case TYPE_PTR:
 212         if (is_host) {
 213             return HOST_LONG_SIZE;
 214         } else {
 215             return TARGET_LONG_SIZE;
 216         }
 217         break;
 218     case TYPE_ARRAY:
 219         return thunk_type_align(type_ptr + 2, is_host);
 220     case TYPE_STRUCT:
 221         se = struct_entries + type_ptr[1];
 222         return se->align[is_host];
 223     default:
 224         return -1;
 225     }
 226 }
 227
 228 #endif /* NO_THUNK_TYPE_SIZE */
 229
 230 unsigned int target_to_host_bitmask(unsigned int x86_mask,
 231                                     bitmask_transtbl * trans_tbl);
 232 unsigned int host_to_target_bitmask(unsigned int alpha_mask,
 233                                     bitmask_transtbl * trans_tbl);
 234
 235 #endif