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      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 #ifndef THUNK_H
     20 #define THUNK_H
     21 
     22 #include <inttypes.h>
     23 #include "cpu.h"
     24 
     25 /* types enums definitions */
     26 
     27 typedef enum argtype {
     28     TYPE_NULL,
     29     TYPE_CHAR,
     30     TYPE_SHORT,
     31     TYPE_INT,
     32     TYPE_LONG,
     33     TYPE_ULONG,
     34     TYPE_PTRVOID, /* pointer on unknown data */
     35     TYPE_LONGLONG,
     36     TYPE_ULONGLONG,
     37     TYPE_PTR,
     38     TYPE_ARRAY,
     39     TYPE_STRUCT,
     40 } argtype;
     41 
     42 #define MK_PTR(type) TYPE_PTR, type
     43 #define MK_ARRAY(type, size) TYPE_ARRAY, size, type
     44 #define MK_STRUCT(id) TYPE_STRUCT, id
     45 
     46 #define THUNK_TARGET 0
     47 #define THUNK_HOST   1
     48 
     49 typedef struct {
     50     /* standard struct handling */
     51     const argtype *field_types;
     52     int nb_fields;
     53     int *field_offsets[2];
     54     /* special handling */
     55     void (*convert[2])(void *dst, const void *src);
     56     int size[2];
     57     int align[2];
     58     const char *name;
     59 } StructEntry;
     60 
     61 /* Translation table for bitmasks... */
     62 typedef struct bitmask_transtbl {
     63 	unsigned int	x86_mask;
     64 	unsigned int	x86_bits;
     65 	unsigned int	alpha_mask;
     66 	unsigned int	alpha_bits;
     67 } bitmask_transtbl;
     68 
     69 void thunk_register_struct(int id, const char *name, const argtype *types);
     70 void thunk_register_struct_direct(int id, const char *name,
     71                                   const 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 int thunk_type_size_array(const argtype *type_ptr, int is_host);
     79 int thunk_type_align_array(const argtype *type_ptr, int is_host);
     80 
     81 static inline int thunk_type_size(const argtype *type_ptr, int is_host)
     82 {
     83     int type, size;
     84     const StructEntry *se;
     85 
     86     type = *type_ptr;
     87     switch(type) {
     88     case TYPE_CHAR:
     89         return 1;
     90     case TYPE_SHORT:
     91         return 2;
     92     case TYPE_INT:
     93         return 4;
     94     case TYPE_LONGLONG:
     95     case TYPE_ULONGLONG:
     96         return 8;
     97     case TYPE_LONG:
     98     case TYPE_ULONG:
     99     case TYPE_PTRVOID:
    100     case TYPE_PTR:
    101         if (is_host) {
    102             return HOST_LONG_SIZE;
    103         } else {
    104             return TARGET_ABI_BITS / 8;
    105         }
    106         break;
    107     case TYPE_ARRAY:
    108         size = type_ptr[1];
    109         return size * thunk_type_size_array(type_ptr + 2, is_host);
    110     case TYPE_STRUCT:
    111         se = struct_entries + type_ptr[1];
    112         return se->size[is_host];
    113     default:
    114         return -1;
    115     }
    116 }
    117 
    118 static inline int thunk_type_align(const argtype *type_ptr, int is_host)
    119 {
    120     int type;
    121     const StructEntry *se;
    122 
    123     type = *type_ptr;
    124     switch(type) {
    125     case TYPE_CHAR:
    126         return 1;
    127     case TYPE_SHORT:
    128         return 2;
    129     case TYPE_INT:
    130         return 4;
    131     case TYPE_LONGLONG:
    132     case TYPE_ULONGLONG:
    133         return 8;
    134     case TYPE_LONG:
    135     case TYPE_ULONG:
    136     case TYPE_PTRVOID:
    137     case TYPE_PTR:
    138         if (is_host) {
    139             return HOST_LONG_SIZE;
    140         } else {
    141             return TARGET_ABI_BITS / 8;
    142         }
    143         break;
    144     case TYPE_ARRAY:
    145         return thunk_type_align_array(type_ptr + 2, is_host);
    146     case TYPE_STRUCT:
    147         se = struct_entries + type_ptr[1];
    148         return se->align[is_host];
    149     default:
    150         return -1;
    151     }
    152 }
    153 
    154 #endif /* NO_THUNK_TYPE_SIZE */
    155 
    156 unsigned int target_to_host_bitmask(unsigned int x86_mask,
    157                                     const bitmask_transtbl * trans_tbl);
    158 unsigned int host_to_target_bitmask(unsigned int alpha_mask,
    159                                     const bitmask_transtbl * trans_tbl);
    160 
    161 #endif
    162