include/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 2.1 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 USER_THUNK_H
  21 #define USER_THUNK_H
  22
  23 #ifndef CONFIG_USER_ONLY
  24 #error Cannot include this header from system emulation
  25 #endif
  26
  27 #include "cpu.h"
  28 #include "user/abitypes.h"
  29
  30 /* types enums definitions */
  31
  32 typedef enum argtype {
  33     TYPE_NULL,
  34     TYPE_CHAR,
  35     TYPE_SHORT,
  36     TYPE_INT,
  37     TYPE_LONG,
  38     TYPE_ULONG,
  39     TYPE_PTRVOID, /* pointer on unknown data */
  40     TYPE_LONGLONG,
  41     TYPE_ULONGLONG,
  42     TYPE_PTR,
  43     TYPE_ARRAY,
  44     TYPE_STRUCT,
  45     TYPE_OLDDEVT,
  46 } argtype;
  47
  48 #define MK_PTR(type) TYPE_PTR, type
  49 #define MK_ARRAY(type, size) TYPE_ARRAY, (int)(size), type
  50 #define MK_STRUCT(id) TYPE_STRUCT, id
  51
  52 #define THUNK_TARGET 0
  53 #define THUNK_HOST   1
  54
  55 typedef struct {
  56     /* standard struct handling */
  57     const argtype *field_types;
  58     int nb_fields;
  59     int *field_offsets[2];
  60     /* special handling */
  61     void (*convert[2])(void *dst, const void *src);
  62     void (*print)(void *arg);
  63     int size[2];
  64     int align[2];
  65     const char *name;
  66 } StructEntry;
  67
  68 /* Translation table for bitmasks... */
  69 typedef struct bitmask_transtbl {
  70     unsigned int target_mask;
  71     unsigned int target_bits;
  72     unsigned int host_mask;
  73     unsigned int host_bits;
  74 } bitmask_transtbl;
  75
  76 void thunk_register_struct(int id, const char *name, const argtype *types);
  77 void thunk_register_struct_direct(int id, const char *name,
  78                                   const StructEntry *se1);
  79 const argtype *thunk_convert(void *dst, const void *src,
  80                              const argtype *type_ptr, int to_host);
  81 const argtype *thunk_print(void *arg, const argtype *type_ptr);
  82
  83 extern StructEntry *struct_entries;
  84
  85 int thunk_type_size_array(const argtype *type_ptr, int is_host);
  86 int thunk_type_align_array(const argtype *type_ptr, int is_host);
  87
  88 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
  89 {
  90     int type, size;
  91     const StructEntry *se;
  92
  93     type = *type_ptr;
  94     switch(type) {
  95     case TYPE_CHAR:
  96         return 1;
  97     case TYPE_SHORT:
  98         return 2;
  99     case TYPE_INT:
 100         return 4;
 101     case TYPE_LONGLONG:
 102     case TYPE_ULONGLONG:
 103         return 8;
 104     case TYPE_LONG:
 105     case TYPE_ULONG:
 106     case TYPE_PTRVOID:
 107     case TYPE_PTR:
 108         if (is_host) {
 109             return sizeof(void *);
 110         } else {
 111             return TARGET_ABI_BITS / 8;
 112         }
 113         break;
 114     case TYPE_OLDDEVT:
 115         if (is_host) {
 116 #if defined(HOST_X86_64)
 117             return 8;
 118 #elif defined(HOST_MIPS) || defined(HOST_SPARC64)
 119             return 4;
 120 #elif defined(HOST_PPC)
 121             return sizeof(void *);
 122 #else
 123             return 2;
 124 #endif
 125         } else {
 126 #if defined(TARGET_X86_64)
 127             return 8;
 128 #elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
 129       defined(TARGET_PARISC) || defined(TARGET_SPARC64)
 130             return 4;
 131 #elif defined(TARGET_PPC)
 132             return TARGET_ABI_BITS / 8;
 133 #else
 134             return 2;
 135 #endif
 136         }
 137         break;
 138     case TYPE_ARRAY:
 139         size = type_ptr[1];
 140         return size * thunk_type_size_array(type_ptr + 2, is_host);
 141     case TYPE_STRUCT:
 142         se = struct_entries + type_ptr[1];
 143         return se->size[is_host];
 144     default:
 145         g_assert_not_reached();
 146     }
 147 }
 148
 149 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 150 {
 151     int type;
 152     const StructEntry *se;
 153
 154     type = *type_ptr;
 155     switch(type) {
 156     case TYPE_CHAR:
 157         return 1;
 158     case TYPE_SHORT:
 159         if (is_host) {
 160             return __alignof__(short);
 161         } else {
 162             return ABI_SHORT_ALIGNMENT;
 163         }
 164     case TYPE_INT:
 165         if (is_host) {
 166             return __alignof__(int);
 167         } else {
 168             return ABI_INT_ALIGNMENT;
 169         }
 170     case TYPE_LONGLONG:
 171     case TYPE_ULONGLONG:
 172         if (is_host) {
 173             return __alignof__(long long);
 174         } else {
 175             return ABI_LLONG_ALIGNMENT;
 176         }
 177     case TYPE_LONG:
 178     case TYPE_ULONG:
 179     case TYPE_PTRVOID:
 180     case TYPE_PTR:
 181         if (is_host) {
 182             return __alignof__(long);
 183         } else {
 184             return ABI_LONG_ALIGNMENT;
 185         }
 186         break;
 187     case TYPE_OLDDEVT:
 188         return thunk_type_size(type_ptr, is_host);
 189     case TYPE_ARRAY:
 190         return thunk_type_align_array(type_ptr + 2, is_host);
 191     case TYPE_STRUCT:
 192         se = struct_entries + type_ptr[1];
 193         return se->align[is_host];
 194     default:
 195         g_assert_not_reached();
 196     }
 197 }
 198
 199 unsigned int target_to_host_bitmask_len(unsigned int target_mask,
 200                                         const bitmask_transtbl *trans_tbl,
 201                                         size_t trans_len);
 202 unsigned int host_to_target_bitmask_len(unsigned int host_mask,
 203                                         const bitmask_transtbl * trans_tbl,
 204                                         size_t trans_len);
 205
 206 #define target_to_host_bitmask(M, T) \
 207     target_to_host_bitmask_len(M, T, ARRAY_SIZE(T))
 208 #define host_to_target_bitmask(M, T) \
 209     host_to_target_bitmask_len(M, T, ARRAY_SIZE(T))
 210
 211 void thunk_init(unsigned int max_structs);
 212
 213 #endif