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 "config.h"
  25
  26 #include "bswap.h"
  27
  28 #if defined(WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
  29 #define BSWAP_NEEDED
  30 #endif
  31
  32 /* XXX: autoconf */
  33 #define TARGET_LONG_BITS 32
  34
  35 #define TARGET_LONG_SIZE (TARGET_LONG_BITS / 8)
  36
  37 #ifdef BSWAP_NEEDED
  38
  39 static inline uint16_t tswap16(uint16_t s)
  40 {
  41     return bswap16(s);
  42 }
  43
  44 static inline uint32_t tswap32(uint32_t s)
  45 {
  46     return bswap32(s);
  47 }
  48
  49 static inline uint64_t tswap64(uint64_t s)
  50 {
  51     return bswap64(s);
  52 }
  53
  54 static inline void tswap16s(uint16_t *s)
  55 {
  56     *s = bswap16(*s);
  57 }
  58
  59 static inline void tswap32s(uint32_t *s)
  60 {
  61     *s = bswap32(*s);
  62 }
  63
  64 static inline void tswap64s(uint64_t *s)
  65 {
  66     *s = bswap64(*s);
  67 }
  68
  69 #else
  70
  71 static inline uint16_t tswap16(uint16_t s)
  72 {
  73     return s;
  74 }
  75
  76 static inline uint32_t tswap32(uint32_t s)
  77 {
  78     return s;
  79 }
  80
  81 static inline uint64_t tswap64(uint64_t s)
  82 {
  83     return s;
  84 }
  85
  86 static inline void tswap16s(uint16_t *s)
  87 {
  88 }
  89
  90 static inline void tswap32s(uint32_t *s)
  91 {
  92 }
  93
  94 static inline void tswap64s(uint64_t *s)
  95 {
  96 }
  97
  98 #endif
  99
 100 #if TARGET_LONG_SIZE == 4
 101 #define tswapl(s) tswap32(s)
 102 #define tswapls(s) tswap32s((uint32_t *)(s))
 103 #else
 104 #define tswapl(s) tswap64(s)
 105 #define tswapls(s) tswap64s((uint64_t *)(s))
 106 #endif
 107
 108 #if TARGET_LONG_SIZE == 4
 109 typedef int32_t target_long;
 110 typedef uint32_t target_ulong;
 111 #elif TARGET_LONG_SIZE == 8
 112 typedef int64_t target_long;
 113 typedef uint64_t target_ulong;
 114 #else
 115 #error TARGET_LONG_SIZE undefined
 116 #endif
 117
 118 /* types enums definitions */
 119
 120 typedef enum argtype {
 121     TYPE_NULL,
 122     TYPE_CHAR,
 123     TYPE_SHORT,
 124     TYPE_INT,
 125     TYPE_LONG,
 126     TYPE_ULONG,
 127     TYPE_PTRVOID, /* pointer on unknown data */
 128     TYPE_LONGLONG,
 129     TYPE_ULONGLONG,
 130     TYPE_PTR,
 131     TYPE_ARRAY,
 132     TYPE_STRUCT,
 133 } argtype;
 134
 135 #define MK_PTR(type) TYPE_PTR, type
 136 #define MK_ARRAY(type, size) TYPE_ARRAY, size, type
 137 #define MK_STRUCT(id) TYPE_STRUCT, id
 138
 139 #define THUNK_TARGET 0
 140 #define THUNK_HOST   1
 141
 142 typedef struct {
 143     /* standard struct handling */
 144     const argtype *field_types;
 145     int nb_fields;
 146     int *field_offsets[2];
 147     /* special handling */
 148     void (*convert[2])(void *dst, const void *src);
 149     int size[2];
 150     int align[2];
 151     const char *name;
 152 } StructEntry;
 153
 154 /* Translation table for bitmasks... */
 155 typedef struct bitmask_transtbl {
 156         unsigned int    x86_mask;
 157         unsigned int    x86_bits;
 158         unsigned int    alpha_mask;
 159         unsigned int    alpha_bits;
 160 } bitmask_transtbl;
 161
 162 void thunk_register_struct(int id, const char *name, const argtype *types);
 163 void thunk_register_struct_direct(int id, const char *name, StructEntry *se1);
 164 const argtype *thunk_convert(void *dst, const void *src,
 165                              const argtype *type_ptr, int to_host);
 166 #ifndef NO_THUNK_TYPE_SIZE
 167
 168 extern StructEntry struct_entries[];
 169
 170 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
 171 {
 172     int type, size;
 173     const StructEntry *se;
 174
 175     type = *type_ptr;
 176     switch(type) {
 177     case TYPE_CHAR:
 178         return 1;
 179     case TYPE_SHORT:
 180         return 2;
 181     case TYPE_INT:
 182         return 4;
 183     case TYPE_LONGLONG:
 184     case TYPE_ULONGLONG:
 185         return 8;
 186     case TYPE_LONG:
 187     case TYPE_ULONG:
 188     case TYPE_PTRVOID:
 189     case TYPE_PTR:
 190         if (is_host) {
 191             return HOST_LONG_SIZE;
 192         } else {
 193             return TARGET_LONG_SIZE;
 194         }
 195         break;
 196     case TYPE_ARRAY:
 197         size = type_ptr[1];
 198         return size * thunk_type_size(type_ptr + 2, is_host);
 199     case TYPE_STRUCT:
 200         se = struct_entries + type_ptr[1];
 201         return se->size[is_host];
 202     default:
 203         return -1;
 204     }
 205 }
 206
 207 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 208 {
 209     int type;
 210     const StructEntry *se;
 211
 212     type = *type_ptr;
 213     switch(type) {
 214     case TYPE_CHAR:
 215         return 1;
 216     case TYPE_SHORT:
 217         return 2;
 218     case TYPE_INT:
 219         return 4;
 220     case TYPE_LONGLONG:
 221     case TYPE_ULONGLONG:
 222         return 8;
 223     case TYPE_LONG:
 224     case TYPE_ULONG:
 225     case TYPE_PTRVOID:
 226     case TYPE_PTR:
 227         if (is_host) {
 228             return HOST_LONG_SIZE;
 229         } else {
 230             return TARGET_LONG_SIZE;
 231         }
 232         break;
 233     case TYPE_ARRAY:
 234         return thunk_type_align(type_ptr + 2, is_host);
 235     case TYPE_STRUCT:
 236         se = struct_entries + type_ptr[1];
 237         return se->align[is_host];
 238     default:
 239         return -1;
 240     }
 241 }
 242
 243 #endif /* NO_THUNK_TYPE_SIZE */
 244
 245 unsigned int target_to_host_bitmask(unsigned int x86_mask,
 246                                     bitmask_transtbl * trans_tbl);
 247 unsigned int host_to_target_bitmask(unsigned int alpha_mask,
 248                                     bitmask_transtbl * trans_tbl);
 249
 250 #endif