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
  77 extern StructEntry *struct_entries;
  78
  79 int thunk_type_size_array(const argtype *type_ptr, int is_host);
  80 int thunk_type_align_array(const argtype *type_ptr, int is_host);
  81
  82 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
  83 {
  84     int type, size;
  85     const StructEntry *se;
  86
  87     type = *type_ptr;
  88     switch(type) {
  89     case TYPE_CHAR:
  90         return 1;
  91     case TYPE_SHORT:
  92         return 2;
  93     case TYPE_INT:
  94         return 4;
  95     case TYPE_LONGLONG:
  96     case TYPE_ULONGLONG:
  97         return 8;
  98     case TYPE_LONG:
  99     case TYPE_ULONG:
 100     case TYPE_PTRVOID:
 101     case TYPE_PTR:
 102         if (is_host) {
 103             return sizeof(void *);
 104         } else {
 105             return TARGET_ABI_BITS / 8;
 106         }
 107         break;
 108     case TYPE_OLDDEVT:
 109         if (is_host) {
 110 #if defined(HOST_X86_64)
 111             return 8;
 112 #elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
 113       defined(HOST_PARISC) || defined(HOST_SPARC64)
 114             return 4;
 115 #elif defined(HOST_PPC)
 116             return sizeof(void *);
 117 #else
 118             return 2;
 119 #endif
 120         } else {
 121 #if defined(TARGET_X86_64)
 122             return 8;
 123 #elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
 124       defined(TARGET_PARISC) || defined(TARGET_SPARC64)
 125             return 4;
 126 #elif defined(TARGET_PPC)
 127             return TARGET_ABI_BITS / 8;
 128 #else
 129             return 2;
 130 #endif
 131         }
 132         break;
 133     case TYPE_ARRAY:
 134         size = type_ptr[1];
 135         return size * thunk_type_size_array(type_ptr + 2, is_host);
 136     case TYPE_STRUCT:
 137         se = struct_entries + type_ptr[1];
 138         return se->size[is_host];
 139     default:
 140         g_assert_not_reached();
 141     }
 142 }
 143
 144 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 145 {
 146     int type;
 147     const StructEntry *se;
 148
 149     type = *type_ptr;
 150     switch(type) {
 151     case TYPE_CHAR:
 152         return 1;
 153     case TYPE_SHORT:
 154         if (is_host) {
 155             return __alignof__(short);
 156         } else {
 157             return ABI_SHORT_ALIGNMENT;
 158         }
 159     case TYPE_INT:
 160         if (is_host) {
 161             return __alignof__(int);
 162         } else {
 163             return ABI_INT_ALIGNMENT;
 164         }
 165     case TYPE_LONGLONG:
 166     case TYPE_ULONGLONG:
 167         if (is_host) {
 168             return __alignof__(long long);
 169         } else {
 170             return ABI_LLONG_ALIGNMENT;
 171         }
 172     case TYPE_LONG:
 173     case TYPE_ULONG:
 174     case TYPE_PTRVOID:
 175     case TYPE_PTR:
 176         if (is_host) {
 177             return __alignof__(long);
 178         } else {
 179             return ABI_LONG_ALIGNMENT;
 180         }
 181         break;
 182     case TYPE_OLDDEVT:
 183         return thunk_type_size(type_ptr, is_host);
 184     case TYPE_ARRAY:
 185         return thunk_type_align_array(type_ptr + 2, is_host);
 186     case TYPE_STRUCT:
 187         se = struct_entries + type_ptr[1];
 188         return se->align[is_host];
 189     default:
 190         g_assert_not_reached();
 191     }
 192 }
 193
 194 unsigned int target_to_host_bitmask(unsigned int target_mask,
 195                                     const bitmask_transtbl * trans_tbl);
 196 unsigned int host_to_target_bitmask(unsigned int host_mask,
 197                                     const bitmask_transtbl * trans_tbl);
 198
 199 void thunk_init(unsigned int max_structs);
 200
 201 #endif