libffi/src/m32r/ffi.c

   1 /* -----------------------------------------------------------------------
   2    ffi.c - Copyright (c) 2004  Renesas Technology
   3            Copyright (c) 2008  Red Hat, Inc.
   4
   5    M32R Foreign Function Interface
   6
   7    Permission is hereby granted, free of charge, to any person obtaining
   8    a copy of this software and associated documentation files (the
   9    ``Software''), to deal in the Software without restriction, including
  10    without limitation the rights to use, copy, modify, merge, publish,
  11    distribute, sublicense, and/or sell copies of the Software, and to
  12    permit persons to whom the Software is furnished to do so, subject to
  13    the following conditions:
  14
  15    The above copyright notice and this permission notice shall be included
  16    in all copies or substantial portions of the Software.
  17
  18    THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21    IN NO EVENT SHALL RENESAS TECHNOLOGY BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22    OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24    OTHER DEALINGS IN THE SOFTWARE.
  25    ----------------------------------------------------------------------- */
  26
  27 #include <ffi.h>
  28 #include <ffi_common.h>
  29
  30 #include <stdlib.h>
  31
  32 /* ffi_prep_args is called by the assembly routine once stack
  33    space has been allocated for the function's arguments.  */
  34
  35 void ffi_prep_args(char *stack, extended_cif *ecif)
  36 {
  37   unsigned int i;
  38   int tmp;
  39   unsigned int avn;
  40   void **p_argv;
  41   char *argp;
  42   ffi_type **p_arg;
  43
  44   tmp = 0;
  45   argp = stack;
  46
  47   if (ecif->cif->rtype->type == FFI_TYPE_STRUCT && ecif->cif->rtype->size > 8)
  48     {
  49       *(void **) argp = ecif->rvalue;
  50       argp += 4;
  51     }
  52
  53   avn = ecif->cif->nargs;
  54   p_argv = ecif->avalue;
  55
  56   for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
  57        (i != 0) && (avn != 0);
  58        i--, p_arg++)
  59     {
  60       size_t z;
  61
  62       /* Align if necessary.  */
  63       if (((*p_arg)->alignment - 1) & (unsigned) argp)
  64         argp = (char *) ALIGN (argp, (*p_arg)->alignment);
  65
  66       if (avn != 0)
  67         {
  68           avn--;
  69           z = (*p_arg)->size;
  70           if (z < sizeof (int))
  71             {
  72               z = sizeof (int);
  73
  74               switch ((*p_arg)->type)
  75                 {
  76                 case FFI_TYPE_SINT8:
  77                   *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
  78                   break;
  79
  80                 case FFI_TYPE_UINT8:
  81                   *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
  82                   break;
  83
  84                 case FFI_TYPE_SINT16:
  85                   *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
  86                   break;
  87
  88                 case FFI_TYPE_UINT16:
  89                   *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
  90                   break;
  91
  92                 case FFI_TYPE_STRUCT:
  93                   z = (*p_arg)->size;
  94                   if ((*p_arg)->alignment != 1)
  95                     memcpy (argp, *p_argv, z);
  96                   else
  97                     memcpy (argp + 4 - z, *p_argv, z);
  98                   z = sizeof (int);
  99                   break;
 100
 101                 default:
 102                   FFI_ASSERT(0);
 103                 }
 104             }
 105           else if (z == sizeof (int))
 106             {
 107                *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
 108             }
 109           else
 110             {
 111               if ((*p_arg)->type == FFI_TYPE_STRUCT)
 112                 {
 113                   if (z > 8)
 114                     {
 115                       *(unsigned int *) argp = (unsigned int)(void *)(* p_argv);
 116                       z = sizeof(void *);
 117                     }
 118                   else
 119                     {
 120                       memcpy(argp, *p_argv, z);
 121                       z = 8;
 122                     }
 123                 }
 124               else
 125                 {
 126                   /* Double or long long 64bit.  */
 127                   memcpy (argp, *p_argv, z);
 128                 }
 129             }
 130           p_argv++;
 131           argp += z;
 132         }
 133     }
 134
 135   return;
 136 }
 137
 138 /* Perform machine dependent cif processing.  */
 139 ffi_status
 140 ffi_prep_cif_machdep(ffi_cif *cif)
 141 {
 142   /* Set the return type flag.  */
 143   switch (cif->rtype->type)
 144     {
 145     case FFI_TYPE_VOID:
 146       cif->flags = (unsigned) cif->rtype->type;
 147       break;
 148
 149     case FFI_TYPE_STRUCT:
 150       if (cif->rtype->size <= 4)
 151         cif->flags = FFI_TYPE_INT;
 152
 153       else if (cif->rtype->size <= 8)
 154         cif->flags = FFI_TYPE_DOUBLE;
 155
 156       else
 157         cif->flags = (unsigned) cif->rtype->type;
 158       break;
 159
 160     case FFI_TYPE_SINT64:
 161     case FFI_TYPE_UINT64:
 162     case FFI_TYPE_DOUBLE:
 163       cif->flags = FFI_TYPE_DOUBLE;
 164       break;
 165
 166     case FFI_TYPE_FLOAT:
 167     default:
 168       cif->flags = FFI_TYPE_INT;
 169       break;
 170     }
 171
 172   return FFI_OK;
 173 }
 174
 175 extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
 176                           unsigned, unsigned, unsigned *, void (*fn)(void));
 177
 178 void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
 179 {
 180   extended_cif ecif;
 181
 182   ecif.cif = cif;
 183   ecif.avalue = avalue;
 184
 185   /* If the return value is a struct and we don't have
 186      a return value address then we need to make one.  */
 187   if ((rvalue == NULL) &&
 188       (cif->rtype->type == FFI_TYPE_STRUCT))
 189     {
 190       ecif.rvalue = alloca (cif->rtype->size);
 191     }
 192   else
 193     ecif.rvalue = rvalue;
 194
 195   switch (cif->abi)
 196     {
 197     case FFI_SYSV:
 198       ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
 199                     cif->flags, ecif.rvalue, fn);
 200       if (cif->rtype->type == FFI_TYPE_STRUCT)
 201         {
 202           int size = cif->rtype->size;
 203           int align = cif->rtype->alignment;
 204
 205           if (size < 4)
 206             {
 207               if (align == 1)
 208                 *(unsigned long *)(ecif.rvalue) <<= (4 - size) * 8;
 209             }
 210           else if (4 < size && size < 8)
 211             {
 212               if (align == 1)
 213                 {
 214                   memcpy (ecif.rvalue, ecif.rvalue + 8-size, size);
 215                 }
 216               else if (align == 2)
 217                 {
 218                   if (size & 1)
 219                     size += 1;
 220
 221                   if (size != 8)
 222                     memcpy (ecif.rvalue, ecif.rvalue + 8-size, size);
 223                 }
 224             }
 225         }
 226       break;
 227
 228     default:
 229       FFI_ASSERT(0);
 230       break;
 231     }
 232 }