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 2.1 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 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, (int)(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     void (*print)(void *arg);
  59     int size[2];
  60     int align[2];
  61     const char *name;
  62 } StructEntry;
  63
  64 /* Translation table for bitmasks... */
  65 typedef struct bitmask_transtbl {
  66     unsigned int target_mask;
  67     unsigned int target_bits;
  68     unsigned int host_mask;
  69     unsigned int host_bits;
  70 } bitmask_transtbl;
  71
  72 void thunk_register_struct(int id, const char *name, const argtype *types);
  73 void thunk_register_struct_direct(int id, const char *name,
  74                                   const StructEntry *se1);
  75 const argtype *thunk_convert(void *dst, const void *src,
  76                              const argtype *type_ptr, int to_host);
  77 const argtype *thunk_print(void *arg, const argtype *type_ptr);
  78
  79 extern StructEntry *struct_entries;
  80
  81 int thunk_type_size_array(const argtype *type_ptr, int is_host);
  82 int thunk_type_align_array(const argtype *type_ptr, int is_host);
  83
  84 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
  85 {
  86     int type, size;
  87     const StructEntry *se;
  88
  89     type = *type_ptr;
  90     switch(type) {
  91     case TYPE_CHAR:
  92         return 1;
  93     case TYPE_SHORT:
  94         return 2;
  95     case TYPE_INT:
  96         return 4;
  97     case TYPE_LONGLONG:
  98     case TYPE_ULONGLONG:
  99         return 8;
 100     case TYPE_LONG:
 101     case TYPE_ULONG:
 102     case TYPE_PTRVOID:
 103     case TYPE_PTR:
 104         if (is_host) {
 105             return sizeof(void *);
 106         } else {
 107             return TARGET_ABI_BITS / 8;
 108         }
 109         break;
 110     case TYPE_OLDDEVT:
 111         if (is_host) {
 112 #if defined(HOST_X86_64)
 113             return 8;
 114 #elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
 115       defined(HOST_PARISC) || defined(HOST_SPARC64)
 116             return 4;
 117 #elif defined(HOST_PPC)
 118             return sizeof(void *);
 119 #else
 120             return 2;
 121 #endif
 122         } else {
 123 #if defined(TARGET_X86_64)
 124             return 8;
 125 #elif defined(TARGET_ALPHA) || defined(TARGET_IA64) || defined(TARGET_MIPS) || \
 126       defined(TARGET_PARISC) || defined(TARGET_SPARC64)
 127             return 4;
 128 #elif defined(TARGET_PPC)
 129             return TARGET_ABI_BITS / 8;
 130 #else
 131             return 2;
 132 #endif
 133         }
 134         break;
 135     case TYPE_ARRAY:
 136         size = type_ptr[1];
 137         return size * thunk_type_size_array(type_ptr + 2, is_host);
 138     case TYPE_STRUCT:
 139         se = struct_entries + type_ptr[1];
 140         return se->size[is_host];
 141     default:
 142         g_assert_not_reached();
 143     }
 144 }
 145
 146 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
 147 {
 148     int type;
 149     const StructEntry *se;
 150
 151     type = *type_ptr;
 152     switch(type) {
 153     case TYPE_CHAR:
 154         return 1;
 155     case TYPE_SHORT:
 156         if (is_host) {
 157             return __alignof__(short);
 158         } else {
 159             return ABI_SHORT_ALIGNMENT;
 160         }
 161     case TYPE_INT:
 162         if (is_host) {
 163             return __alignof__(int);
 164         } else {
 165             return ABI_INT_ALIGNMENT;
 166         }
 167     case TYPE_LONGLONG:
 168     case TYPE_ULONGLONG:
 169         if (is_host) {
 170             return __alignof__(long long);
 171         } else {
 172             return ABI_LLONG_ALIGNMENT;
 173         }
 174     case TYPE_LONG:
 175     case TYPE_ULONG:
 176     case TYPE_PTRVOID:
 177     case TYPE_PTR:
 178         if (is_host) {
 179             return __alignof__(long);
 180         } else {
 181             return ABI_LONG_ALIGNMENT;
 182         }
 183         break;
 184     case TYPE_OLDDEVT:
 185         return thunk_type_size(type_ptr, is_host);
 186     case TYPE_ARRAY:
 187         return thunk_type_align_array(type_ptr + 2, is_host);
 188     case TYPE_STRUCT:
 189         se = struct_entries + type_ptr[1];
 190         return se->align[is_host];
 191     default:
 192         g_assert_not_reached();
 193     }
 194 }
 195
 196 unsigned int target_to_host_bitmask(unsigned int target_mask,
 197                                     const bitmask_transtbl * trans_tbl);
 198 unsigned int host_to_target_bitmask(unsigned int host_mask,
 199                                     const bitmask_transtbl * trans_tbl);
 200
 201 void thunk_init(unsigned int max_structs);
 202
 203 #endif