libffi/src/arc/ffi.c

   1 /* -----------------------------------------------------------------------
   2    ffi.c - Copyright (c) 2013  Synopsys, Inc. (www.synopsys.com)
   3
   4    ARC 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 RENESAS TECHNOLOGY 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 #include <stdint.h>
  31
  32 #include <sys/cachectl.h>
  33
  34 /* for little endian ARC, the code is in fact stored as mixed endian for
  35    performance reasons */
  36 #if __BIG_ENDIAN__
  37 #define CODE_ENDIAN(x) (x)
  38 #else
  39 #define CODE_ENDIAN(x) ( (((uint32_t) (x)) << 16) | (((uint32_t) (x)) >> 16))
  40 #endif
  41
  42 /* ffi_prep_args is called by the assembly routine once stack
  43    space has been allocated for the function's arguments.  */
  44
  45 void
  46 ffi_prep_args (char *stack, extended_cif * ecif)
  47 {
  48   unsigned int i;
  49   int tmp;
  50   void **p_argv;
  51   char *argp;
  52   ffi_type **p_arg;
  53
  54   tmp = 0;
  55   argp = stack;
  56
  57   if (ecif->cif->rtype->type == FFI_TYPE_STRUCT)
  58     {
  59       *(void **) argp = ecif->rvalue;
  60       argp += 4;
  61     }
  62
  63   p_argv = ecif->avalue;
  64
  65   for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
  66        (i != 0); i--, p_arg++)
  67     {
  68       size_t z;
  69       int alignment;
  70
  71       /* align alignment to 4 */
  72       alignment = (((*p_arg)->alignment - 1) | 3) + 1;
  73
  74       /* Align if necessary.  */
  75       if ((alignment - 1) & (unsigned) argp)
  76         argp = (char *) ALIGN (argp, alignment);
  77
  78       z = (*p_arg)->size;
  79       if (z < sizeof (int))
  80         {
  81           z = sizeof (int);
  82
  83           switch ((*p_arg)->type)
  84             {
  85             case FFI_TYPE_SINT8:
  86               *(signed int *) argp = (signed int) *(SINT8 *) (*p_argv);
  87               break;
  88
  89             case FFI_TYPE_UINT8:
  90               *(unsigned int *) argp = (unsigned int) *(UINT8 *) (*p_argv);
  91               break;
  92
  93             case FFI_TYPE_SINT16:
  94               *(signed int *) argp = (signed int) *(SINT16 *) (*p_argv);
  95               break;
  96
  97             case FFI_TYPE_UINT16:
  98               *(unsigned int *) argp = (unsigned int) *(UINT16 *) (*p_argv);
  99               break;
 100
 101             case FFI_TYPE_STRUCT:
 102               memcpy (argp, *p_argv, (*p_arg)->size);
 103               break;
 104
 105             default:
 106               FFI_ASSERT (0);
 107             }
 108         }
 109       else if (z == sizeof (int))
 110         {
 111           *(unsigned int *) argp = (unsigned int) *(UINT32 *) (*p_argv);
 112         }
 113       else
 114         {
 115           if ((*p_arg)->type == FFI_TYPE_STRUCT)
 116             {
 117               memcpy (argp, *p_argv, z);
 118             }
 119           else
 120             {
 121               /* Double or long long 64bit.  */
 122               memcpy (argp, *p_argv, z);
 123             }
 124         }
 125       p_argv++;
 126       argp += z;
 127     }
 128
 129   return;
 130 }
 131
 132 /* Perform machine dependent cif processing.  */
 133 ffi_status
 134 ffi_prep_cif_machdep (ffi_cif * cif)
 135 {
 136   /* Set the return type flag.  */
 137   switch (cif->rtype->type)
 138     {
 139     case FFI_TYPE_VOID:
 140       cif->flags = (unsigned) cif->rtype->type;
 141       break;
 142
 143     case FFI_TYPE_STRUCT:
 144       cif->flags = (unsigned) cif->rtype->type;
 145       break;
 146
 147     case FFI_TYPE_SINT64:
 148     case FFI_TYPE_UINT64:
 149     case FFI_TYPE_DOUBLE:
 150       cif->flags = FFI_TYPE_DOUBLE;
 151       break;
 152
 153     case FFI_TYPE_FLOAT:
 154     default:
 155       cif->flags = FFI_TYPE_INT;
 156       break;
 157     }
 158
 159   return FFI_OK;
 160 }
 161
 162 extern void ffi_call_ARCompact (void (*)(char *, extended_cif *),
 163                                 extended_cif *, unsigned, unsigned,
 164                                 unsigned *, void (*fn) (void));
 165
 166 void
 167 ffi_call (ffi_cif * cif, void (*fn) (void), void *rvalue, void **avalue)
 168 {
 169   extended_cif ecif;
 170
 171   ecif.cif = cif;
 172   ecif.avalue = avalue;
 173
 174   /* If the return value is a struct and we don't have
 175      a return value address then we need to make one.  */
 176   if ((rvalue == NULL) && (cif->rtype->type == FFI_TYPE_STRUCT))
 177     {
 178       ecif.rvalue = alloca (cif->rtype->size);
 179     }
 180   else
 181     ecif.rvalue = rvalue;
 182
 183   switch (cif->abi)
 184     {
 185     case FFI_ARCOMPACT:
 186       ffi_call_ARCompact (ffi_prep_args, &ecif, cif->bytes,
 187                           cif->flags, ecif.rvalue, fn);
 188       break;
 189
 190     default:
 191       FFI_ASSERT (0);
 192       break;
 193     }
 194 }
 195
 196 int
 197 ffi_closure_inner_ARCompact (ffi_closure * closure, void *rvalue,
 198                              ffi_arg * args)
 199 {
 200   void **arg_area, **p_argv;
 201   ffi_cif *cif = closure->cif;
 202   char *argp = (char *) args;
 203   ffi_type **p_argt;
 204   int i;
 205
 206   arg_area = (void **) alloca (cif->nargs * sizeof (void *));
 207
 208   /* handle hidden argument */
 209   if (cif->flags == FFI_TYPE_STRUCT)
 210     {
 211       rvalue = *(void **) argp;
 212       argp += 4;
 213     }
 214
 215   p_argv = arg_area;
 216
 217   for (i = 0, p_argt = cif->arg_types; i < cif->nargs;
 218        i++, p_argt++, p_argv++)
 219     {
 220       size_t z;
 221       int alignment;
 222
 223       /* align alignment to 4 */
 224       alignment = (((*p_argt)->alignment - 1) | 3) + 1;
 225
 226       /* Align if necessary.  */
 227       if ((alignment - 1) & (unsigned) argp)
 228         argp = (char *) ALIGN (argp, alignment);
 229
 230       z = (*p_argt)->size;
 231       *p_argv = (void *) argp;
 232       argp += z;
 233     }
 234
 235   (closure->fun) (cif, rvalue, arg_area, closure->user_data);
 236
 237   return cif->flags;
 238 }
 239
 240 extern void ffi_closure_ARCompact (void);
 241
 242 ffi_status
 243 ffi_prep_closure_loc (ffi_closure * closure, ffi_cif * cif,
 244                       void (*fun) (ffi_cif *, void *, void **, void *),
 245                       void *user_data, void *codeloc)
 246 {
 247   uint32_t *tramp = (uint32_t *) & (closure->tramp[0]);
 248
 249   switch (cif->abi)
 250     {
 251     case FFI_ARCOMPACT:
 252       FFI_ASSERT (tramp == codeloc);
 253       tramp[0] = CODE_ENDIAN (0x200a1fc0);      /* mov r8, pcl  */
 254       tramp[1] = CODE_ENDIAN (0x20200f80);      /* j [long imm] */
 255       tramp[2] = CODE_ENDIAN (ffi_closure_ARCompact);
 256       break;
 257
 258     default:
 259       return FFI_BAD_ABI;
 260     }
 261
 262   closure->cif = cif;
 263   closure->fun = fun;
 264   closure->user_data = user_data;
 265   cacheflush (codeloc, FFI_TRAMPOLINE_SIZE, BCACHE);
 266
 267   return FFI_OK;
 268 }