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 /* 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 } argtype;
  42
  43 #define MK_PTR(type) TYPE_PTR, type
  44 #define MK_ARRAY(type, size) TYPE_ARRAY, size, type
  45 #define MK_STRUCT(id) TYPE_STRUCT, id
  46
  47 #define THUNK_TARGET 0
  48 #define THUNK_HOST   1
  49
  50 typedef struct {
  51     /* standard struct handling */
  52     const argtype *field_types;
  53     int nb_fields;
  54     int *field_offsets[2];
  55     /* special handling */
  56     void (*convert[2])(void *dst, const void *src);
  57     int size[2];
  58     int align[2];
  59     const char *name;
  60 } StructEntry;
  61
  62 /* Translation table for bitmasks... */
  63 typedef struct bitmask_transtbl {
  64         unsigned int    x86_mask;
  65         unsigned int    x86_bits;
  66         unsigned int    alpha_mask;
  67         unsigned int    alpha_bits;
  68 } bitmask_transtbl;
  69
  70 void thunk_register_struct(int id, const char *name, const argtype *types);
  71 void thunk_register_struct_direct(int id, const char *name, StructEntry *se1);
  72 const argtype *thunk_convert(void *dst, const void *src,
  73                              const argtype *type_ptr, int to_host);
  74 #ifndef NO_THUNK_TYPE_SIZE
  75
  76 extern StructEntry struct_entries[];
  77
  78 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
  79 {
  80     int type, size;
  81     const StructEntry *se;
  82
  83     type = *type_ptr;
  84     switch(type) {
  85     case TYPE_CHAR:
  86         return 1;
  87     case TYPE_SHORT:
  88         return 2;
  89     case TYPE_INT:
  90         return 4;
  91     case TYPE_LONGLONG:
  92     case TYPE_ULONGLONG:
  93         return 8;
  94     case TYPE_LONG:
  95     case TYPE_ULONG:
  96     case TYPE_PTRVOID:
  97     case TYPE_PTR:
  98         if (is_host) {
  99             return HOST_LONG_SIZE;
 100         } else {
 101             return TARGET_LONG_SIZE;
 102         }
 103         break;
 104     case TYPE_ARRAY:
 105         size = type_ptr[1];
 106         return size * thunk_type_size(type_ptr + 2, is_host);
 107     case TYPE_STRUCT:
 108         se = struct_entries + type_ptr[1];
 109         return se->size[is_host];
 110     default:
 111         return -1;
 112     }
 113 }
 114
 115 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 116 {
 117     int type;
 118     const StructEntry *se;
 119
 120     type = *type_ptr;
 121     switch(type) {
 122     case TYPE_CHAR:
 123         return 1;
 124     case TYPE_SHORT:
 125         return 2;
 126     case TYPE_INT:
 127         return 4;
 128     case TYPE_LONGLONG:
 129     case TYPE_ULONGLONG:
 130         return 8;
 131     case TYPE_LONG:
 132     case TYPE_ULONG:
 133     case TYPE_PTRVOID:
 134     case TYPE_PTR:
 135         if (is_host) {
 136             return HOST_LONG_SIZE;
 137         } else {
 138             return TARGET_LONG_SIZE;
 139         }
 140         break;
 141     case TYPE_ARRAY:
 142         return thunk_type_align(type_ptr + 2, is_host);
 143     case TYPE_STRUCT:
 144         se = struct_entries + type_ptr[1];
 145         return se->align[is_host];
 146     default:
 147         return -1;
 148     }
 149 }
 150
 151 #endif /* NO_THUNK_TYPE_SIZE */
 152
 153 unsigned int target_to_host_bitmask(unsigned int x86_mask,
 154                                     bitmask_transtbl * trans_tbl);
 155 unsigned int host_to_target_bitmask(unsigned int alpha_mask,
 156                                     bitmask_transtbl * trans_tbl);
 157
 158 #endif