old-autovect-branch/libffi/src/arm/ffi.c

   1 /* -----------------------------------------------------------------------
   2    ffi.c - Copyright (c) 1998  Red Hat, Inc.
   3
   4    ARM Foreign Function Interface
   5
   6    Permission is hereby granted, free of charge, to any person obtaining
   7    a copy of this software and associated documentation files (the
   8    ``Software''), to deal in the Software without restriction, including
   9    without limitation the rights to use, copy, modify, merge, publish,
  10    distribute, sublicense, and/or sell copies of the Software, and to
  11    permit persons to whom the Software is furnished to do so, subject to
  12    the following conditions:
  13
  14    The above copyright notice and this permission notice shall be included
  15    in all copies or substantial portions of the Software.
  16
  17    THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20    IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21    OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23    OTHER DEALINGS IN THE SOFTWARE.
  24    ----------------------------------------------------------------------- */
  25
  26 #include <ffi.h>
  27 #include <ffi_common.h>
  28
  29 #include <stdlib.h>
  30
  31 /* ffi_prep_args is called by the assembly routine once stack space
  32    has been allocated for the function's arguments */
  33
  34 /*@-exportheader@*/
  35 void ffi_prep_args(char *stack, extended_cif *ecif)
  36 /*@=exportheader@*/
  37 {
  38   register unsigned int i;
  39   register void **p_argv;
  40   register char *argp;
  41   register ffi_type **p_arg;
  42
  43   argp = stack;
  44
  45   if ( ecif->cif->rtype->type == FFI_TYPE_STRUCT ) {
  46     *(void **) argp = ecif->rvalue;
  47     argp += 4;
  48   }
  49
  50   p_argv = ecif->avalue;
  51
  52   for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
  53        (i != 0);
  54        i--, p_arg++)
  55     {
  56       size_t z;
  57
  58       /* Align if necessary */
  59       if (((*p_arg)->alignment - 1) & (unsigned) argp) {
  60         argp = (char *) ALIGN(argp, (*p_arg)->alignment);
  61       }
  62
  63           z = (*p_arg)->size;
  64           if (z < sizeof(int))
  65             {
  66               z = sizeof(int);
  67               switch ((*p_arg)->type)
  68                 {
  69                 case FFI_TYPE_SINT8:
  70                   *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
  71                   break;
  72
  73                 case FFI_TYPE_UINT8:
  74                   *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
  75                   break;
  76
  77                 case FFI_TYPE_SINT16:
  78                   *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
  79                   break;
  80
  81                 case FFI_TYPE_UINT16:
  82                   *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
  83                   break;
  84
  85                 case FFI_TYPE_STRUCT:
  86                   *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
  87                   break;
  88
  89                 default:
  90                   FFI_ASSERT(0);
  91                 }
  92             }
  93           else if (z == sizeof(int))
  94             {
  95               *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
  96             }
  97           else
  98             {
  99               memcpy(argp, *p_argv, z);
 100             }
 101           p_argv++;
 102           argp += z;
 103     }
 104
 105   return;
 106 }
 107
 108 /* Perform machine dependent cif processing */
 109 ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
 110 {
 111   /* Round the stack up to a multiple of 8 bytes.  This isn't needed
 112      everywhere, but it is on some platforms, and it doesn't harm anything
 113      when it isn't needed.  */
 114   cif->bytes = (cif->bytes + 7) & ~7;
 115
 116   /* Set the return type flag */
 117   switch (cif->rtype->type)
 118     {
 119     case FFI_TYPE_VOID:
 120     case FFI_TYPE_STRUCT:
 121     case FFI_TYPE_FLOAT:
 122     case FFI_TYPE_DOUBLE:
 123       cif->flags = (unsigned) cif->rtype->type;
 124       break;
 125
 126     case FFI_TYPE_SINT64:
 127     case FFI_TYPE_UINT64:
 128       cif->flags = (unsigned) FFI_TYPE_SINT64;
 129       break;
 130
 131     default:
 132       cif->flags = FFI_TYPE_INT;
 133       break;
 134     }
 135
 136   return FFI_OK;
 137 }
 138
 139 /*@-declundef@*/
 140 /*@-exportheader@*/
 141 extern void ffi_call_SYSV(void (*)(char *, extended_cif *),
 142                           /*@out@*/ extended_cif *,
 143                           unsigned, unsigned,
 144                           /*@out@*/ unsigned *,
 145                           void (*fn)());
 146 /*@=declundef@*/
 147 /*@=exportheader@*/
 148
 149 void ffi_call(/*@dependent@*/ ffi_cif *cif,
 150               void (*fn)(),
 151               /*@out@*/ void *rvalue,
 152               /*@dependent@*/ void **avalue)
 153 {
 154   extended_cif ecif;
 155
 156   ecif.cif = cif;
 157   ecif.avalue = avalue;
 158
 159   /* If the return value is a struct and we don't have a return */
 160   /* value address then we need to make one                     */
 161
 162   if ((rvalue == NULL) &&
 163       (cif->rtype->type == FFI_TYPE_STRUCT))
 164     {
 165       /*@-sysunrecog@*/
 166       ecif.rvalue = alloca(cif->rtype->size);
 167       /*@=sysunrecog@*/
 168     }
 169   else
 170     ecif.rvalue = rvalue;
 171
 172
 173   switch (cif->abi)
 174     {
 175     case FFI_SYSV:
 176       /*@-usedef@*/
 177       ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
 178                     cif->flags, ecif.rvalue, fn);
 179       /*@=usedef@*/
 180       break;
 181     default:
 182       FFI_ASSERT(0);
 183       break;
 184     }
 185 }