include/exec/user/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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef THUNK_H
  21 #define THUNK_H
  22
  23 #include "cpu.h"
  24 #include "exec/user/abitypes.h"
  25
  26 /* types enums definitions */
  27
  28 typedef enum argtype {
  29     TYPE_NULL,
  30     TYPE_CHAR,
  31     TYPE_SHORT,
  32     TYPE_INT,
  33     TYPE_LONG,
  34     TYPE_ULONG,
  35     TYPE_PTRVOID, /* pointer on unknown data */
  36     TYPE_LONGLONG,
  37     TYPE_ULONGLONG,
  38     TYPE_PTR,
  39     TYPE_ARRAY,
  40     TYPE_STRUCT,
  41     TYPE_OLDDEVT,
  42 } argtype;
  43
  44 #define MK_PTR(type) TYPE_PTR, type
  45 #define MK_ARRAY(type, size) TYPE_ARRAY, size, type
  46 #define MK_STRUCT(id) TYPE_STRUCT, id
  47
  48 #define THUNK_TARGET 0
  49 #define THUNK_HOST   1
  50
  51 typedef struct {
  52     /* standard struct handling */
  53     const argtype *field_types;
  54     int nb_fields;
  55     int *field_offsets[2];
  56     /* special handling */
  57     void (*convert[2])(void *dst, const void *src);
  58     int size[2];
  59     int align[2];
  60     const char *name;
  61 } StructEntry;
  62
  63 /* Translation table for bitmasks... */
  64 typedef struct bitmask_transtbl {
  65     unsigned int target_mask;
  66     unsigned int target_bits;
  67     unsigned int host_mask;
  68     unsigned int host_bits;
  69 } bitmask_transtbl;
  70
  71 void thunk_register_struct(int id, const char *name, const argtype *types);
  72 void thunk_register_struct_direct(int id, const char *name,
  73                                   const StructEntry *se1);
  74 const argtype *thunk_convert(void *dst, const void *src,
  75                              const argtype *type_ptr, int to_host);
  76 const argtype *thunk_print(void *arg, const argtype *type_ptr);
  77
  78 extern StructEntry *struct_entries;
  79
  80 int thunk_type_size_array(const argtype *type_ptr, int is_host);
  81 int thunk_type_align_array(const argtype *type_ptr, int is_host);
  82
  83 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
  84 {
  85     int type, size;
  86     const StructEntry *se;
  87
  88     type = *type_ptr;
  89     switch(type) {
  90     case TYPE_CHAR:
  91         return 1;
  92     case TYPE_SHORT:
  93         return 2;
  94     case TYPE_INT:
  95         return 4;
  96     case TYPE_LONGLONG:
  97     case TYPE_ULONGLONG:
  98         return 8;
  99     case TYPE_LONG:
 100     case TYPE_ULONG:
 101     case TYPE_PTRVOID:
 102     case TYPE_PTR:
 103         if (is_host) {
 104             return sizeof(void *);
 105         } else {
 106             return TARGET_ABI_BITS / 8;
 107         }
 108         break;
 109     case TYPE_OLDDEVT:
 110         if (is_host) {
 111 #if defined(HOST_X86_64)
 112             return 8;
 113 #elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
 114       defined(HOST_PARISC) || defined(HOST_SPARC64)
 115             return 4;
 116 #elif defined(HOST_PPC)
 117             return sizeof(void *);
 118 #else
 119             return 2;
 120 #endif
 121         } else {
 122 #if defined(TARGET_X86_64)
 123             return 8;
 124 #elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
 125       defined(TARGET_PARISC) || defined(TARGET_SPARC64)
 126             return 4;
 127 #elif defined(TARGET_PPC)
 128             return TARGET_ABI_BITS / 8;
 129 #else
 130             return 2;
 131 #endif
 132         }
 133         break;
 134     case TYPE_ARRAY:
 135         size = type_ptr[1];
 136         return size * thunk_type_size_array(type_ptr + 2, is_host);
 137     case TYPE_STRUCT:
 138         se = struct_entries + type_ptr[1];
 139         return se->size[is_host];
 140     default:
 141         g_assert_not_reached();
 142     }
 143 }
 144
 145 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 146 {
 147     int type;
 148     const StructEntry *se;
 149
 150     type = *type_ptr;
 151     switch(type) {
 152     case TYPE_CHAR:
 153         return 1;
 154     case TYPE_SHORT:
 155         if (is_host) {
 156             return __alignof__(short);
 157         } else {
 158             return ABI_SHORT_ALIGNMENT;
 159         }
 160     case TYPE_INT:
 161         if (is_host) {
 162             return __alignof__(int);
 163         } else {
 164             return ABI_INT_ALIGNMENT;
 165         }
 166     case TYPE_LONGLONG:
 167     case TYPE_ULONGLONG:
 168         if (is_host) {
 169             return __alignof__(long long);
 170         } else {
 171             return ABI_LLONG_ALIGNMENT;
 172         }
 173     case TYPE_LONG:
 174     case TYPE_ULONG:
 175     case TYPE_PTRVOID:
 176     case TYPE_PTR:
 177         if (is_host) {
 178             return __alignof__(long);
 179         } else {
 180             return ABI_LONG_ALIGNMENT;
 181         }
 182         break;
 183     case TYPE_OLDDEVT:
 184         return thunk_type_size(type_ptr, is_host);
 185     case TYPE_ARRAY:
 186         return thunk_type_align_array(type_ptr + 2, is_host);
 187     case TYPE_STRUCT:
 188         se = struct_entries + type_ptr[1];
 189         return se->align[is_host];
 190     default:
 191         g_assert_not_reached();
 192     }
 193 }
 194
 195 unsigned int target_to_host_bitmask(unsigned int target_mask,
 196                                     const bitmask_transtbl * trans_tbl);
 197 unsigned int host_to_target_bitmask(unsigned int host_mask,
 198                                     const bitmask_transtbl * trans_tbl);
 199
 200 void thunk_init(unsigned int max_structs);
 201
 202 #endif