toolchain/gcc/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   /* Set the return type flag */
 112   switch (cif->rtype->type)
 113     {
 114     case FFI_TYPE_VOID:
 115     case FFI_TYPE_STRUCT:
 116     case FFI_TYPE_FLOAT:
 117     case FFI_TYPE_DOUBLE:
 118       cif->flags = (unsigned) cif->rtype->type;
 119       break;
 120
 121     default:
 122       cif->flags = FFI_TYPE_INT;
 123       break;
 124     }
 125
 126   return FFI_OK;
 127 }
 128
 129 /*@-declundef@*/
 130 /*@-exportheader@*/
 131 extern void ffi_call_SYSV(void (*)(char *, extended_cif *),
 132                           /*@out@*/ extended_cif *,
 133                           unsigned, unsigned,
 134                           /*@out@*/ unsigned *,
 135                           void (*fn)());
 136 /*@=declundef@*/
 137 /*@=exportheader@*/
 138
 139 void ffi_call(/*@dependent@*/ ffi_cif *cif,
 140               void (*fn)(),
 141               /*@out@*/ void *rvalue,
 142               /*@dependent@*/ void **avalue)
 143 {
 144   extended_cif ecif;
 145
 146   ecif.cif = cif;
 147   ecif.avalue = avalue;
 148
 149   /* If the return value is a struct and we don't have a return */
 150   /* value address then we need to make one                     */
 151
 152   if ((rvalue == NULL) &&
 153       (cif->rtype->type == FFI_TYPE_STRUCT))
 154     {
 155       /*@-sysunrecog@*/
 156       ecif.rvalue = alloca(cif->rtype->size);
 157       /*@=sysunrecog@*/
 158     }
 159   else
 160     ecif.rvalue = rvalue;
 161
 162
 163   switch (cif->abi)
 164     {
 165     case FFI_SYSV:
 166       /*@-usedef@*/
 167       ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
 168                     cif->flags, ecif.rvalue, fn);
 169       /*@=usedef@*/
 170       break;
 171     default:
 172       FFI_ASSERT(0);
 173       break;
 174     }
 175 }