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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libffi/] [src/] [m68k/] [ffi.c] - Blame information for rev 741

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Line No. Rev Author Line
1 732 jeremybenn 
/* -----------------------------------------------------------------------
2 
   ffi.c
3 
 
4 
   m68k Foreign Function Interface
5 
   ----------------------------------------------------------------------- */
6 
 
7 
#include <ffi.h>
8 
#include <ffi_common.h>
9 
 
10 
#include <stdlib.h>
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#include <unistd.h>
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#ifdef __rtems__
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void rtems_cache_flush_multiple_data_lines( const void *, size_t );
14 
#else
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#include <sys/syscall.h>
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#include <asm/cachectl.h>
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#endif
18 
 
19 
void ffi_call_SYSV (extended_cif *,
20 
                    unsigned, unsigned,
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                    void *, void (*fn) ());
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void *ffi_prep_args (void *stack, extended_cif *ecif);
23 
void ffi_closure_SYSV (ffi_closure *);
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void ffi_closure_struct_SYSV (ffi_closure *);
25 
unsigned int ffi_closure_SYSV_inner (ffi_closure *closure,
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                                     void *resp, void *args);
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/* ffi_prep_args is called by the assembly routine once stack space has
29 
   been allocated for the function's arguments.  */
30 
 
31 
void *
32 
ffi_prep_args (void *stack, extended_cif *ecif)
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{
34 
  unsigned int i;
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  void **p_argv;
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  char *argp;
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  ffi_type **p_arg;
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  void *struct_value_ptr;
39 
 
40 
  argp = stack;
41 
 
42 
  if (ecif->cif->rtype->type == FFI_TYPE_STRUCT
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      && !ecif->cif->flags)
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    struct_value_ptr = ecif->rvalue;
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  else
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    struct_value_ptr = NULL;
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  p_argv = ecif->avalue;
49 
 
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  for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
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       i != 0;
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       i--, p_arg++)
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    {
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      size_t z;
55 
 
56 
      z = (*p_arg)->size;
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      if (z < sizeof (int))
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        {
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          switch ((*p_arg)->type)
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            {
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            case FFI_TYPE_SINT8:
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              *(signed int *) argp = (signed int) *(SINT8 *) *p_argv;
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              break;
64 
 
65 
            case FFI_TYPE_UINT8:
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              *(unsigned int *) argp = (unsigned int) *(UINT8 *) *p_argv;
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              break;
68 
 
69 
            case FFI_TYPE_SINT16:
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              *(signed int *) argp = (signed int) *(SINT16 *) *p_argv;
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              break;
72 
 
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            case FFI_TYPE_UINT16:
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              *(unsigned int *) argp = (unsigned int) *(UINT16 *) *p_argv;
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              break;
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            case FFI_TYPE_STRUCT:
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              memcpy (argp + sizeof (int) - z, *p_argv, z);
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              break;
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            default:
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              FFI_ASSERT (0);
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            }
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          z = sizeof (int);
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        }
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      else
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        {
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          memcpy (argp, *p_argv, z);
89 
 
90 
          /* Align if necessary.  */
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          if ((sizeof(int) - 1) & z)
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            z = ALIGN(z, sizeof(int));
93 
        }
94 
 
95 
      p_argv++;
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      argp += z;
97 
    }
98 
 
99 
  return struct_value_ptr;
100 
}
101 
 
102 
#define CIF_FLAGS_INT           1
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#define CIF_FLAGS_DINT          2
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#define CIF_FLAGS_FLOAT         4
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#define CIF_FLAGS_DOUBLE        8
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#define CIF_FLAGS_LDOUBLE       16
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#define CIF_FLAGS_POINTER       32
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#define CIF_FLAGS_STRUCT1       64
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#define CIF_FLAGS_STRUCT2       128
110 
 
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/* Perform machine dependent cif processing */
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ffi_status
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ffi_prep_cif_machdep (ffi_cif *cif)
114 
{
115 
  /* Set the return type flag */
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  switch (cif->rtype->type)
117 
    {
118 
    case FFI_TYPE_VOID:
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      cif->flags = 0;
120 
      break;
121 
 
122 
    case FFI_TYPE_STRUCT:
123 
      switch (cif->rtype->size)
124 
        {
125 
        case 1:
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          cif->flags = CIF_FLAGS_STRUCT1;
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          break;
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        case 2:
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          cif->flags = CIF_FLAGS_STRUCT2;
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          break;
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        case 4:
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          cif->flags = CIF_FLAGS_INT;
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          break;
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        case 8:
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          cif->flags = CIF_FLAGS_DINT;
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          break;
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        default:
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          cif->flags = 0;
139 
          break;
140 
        }
141 
      break;
142 
 
143 
    case FFI_TYPE_FLOAT:
144 
      cif->flags = CIF_FLAGS_FLOAT;
145 
      break;
146 
 
147 
    case FFI_TYPE_DOUBLE:
148 
      cif->flags = CIF_FLAGS_DOUBLE;
149 
      break;
150 
 
151 
#if (FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE)
152 
    case FFI_TYPE_LONGDOUBLE:
153 
      cif->flags = CIF_FLAGS_LDOUBLE;
154 
      break;
155 
#endif
156 
 
157 
    case FFI_TYPE_POINTER:
158 
      cif->flags = CIF_FLAGS_POINTER;
159 
      break;
160 
 
161 
    case FFI_TYPE_SINT64:
162 
    case FFI_TYPE_UINT64:
163 
      cif->flags = CIF_FLAGS_DINT;
164 
      break;
165 
 
166 
    default:
167 
      cif->flags = CIF_FLAGS_INT;
168 
      break;
169 
    }
170 
 
171 
  return FFI_OK;
172 
}
173 
 
174 
void
175 
ffi_call (ffi_cif *cif, void (*fn) (), void *rvalue, void **avalue)
176 
{
177 
  extended_cif ecif;
178 
 
179 
  ecif.cif = cif;
180 
  ecif.avalue = avalue;
181 
 
182 
  /* If the return value is a struct and we don't have a return value
183 
     address then we need to make one.  */
184 
 
185 
  if (rvalue == NULL
186 
      && cif->rtype->type == FFI_TYPE_STRUCT
187 
      && cif->rtype->size > 8)
188 
    ecif.rvalue = alloca (cif->rtype->size);
189 
  else
190 
    ecif.rvalue = rvalue;
191 
 
192 
  switch (cif->abi)
193 
    {
194 
    case FFI_SYSV:
195 
      ffi_call_SYSV (&ecif, cif->bytes, cif->flags,
196 
                     ecif.rvalue, fn);
197 
      break;
198 
 
199 
    default:
200 
      FFI_ASSERT (0);
201 
      break;
202 
    }
203 
}
204 
 
205 
static void
206 
ffi_prep_incoming_args_SYSV (char *stack, void **avalue, ffi_cif *cif)
207 
{
208 
  unsigned int i;
209 
  void **p_argv;
210 
  char *argp;
211 
  ffi_type **p_arg;
212 
 
213 
  argp = stack;
214 
  p_argv = avalue;
215 
 
216 
  for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
217 
    {
218 
      size_t z;
219 
 
220 
      z = (*p_arg)->size;
221 
      if (z <= 4)
222 
        {
223 
          *p_argv = (void *) (argp + 4 - z);
224 
 
225 
          z = 4;
226 
        }
227 
      else
228 
        {
229 
          *p_argv = (void *) argp;
230 
 
231 
          /* Align if necessary */
232 
          if ((sizeof(int) - 1) & z)
233 
            z = ALIGN(z, sizeof(int));
234 
        }
235 
 
236 
      p_argv++;
237 
      argp += z;
238 
    }
239 
}
240 
 
241 
unsigned int
242 
ffi_closure_SYSV_inner (ffi_closure *closure, void *resp, void *args)
243 
{
244 
  ffi_cif *cif;
245 
  void **arg_area;
246 
 
247 
  cif = closure->cif;
248 
  arg_area = (void**) alloca (cif->nargs * sizeof (void *));
249 
 
250 
  ffi_prep_incoming_args_SYSV(args, arg_area, cif);
251 
 
252 
  (closure->fun) (cif, resp, arg_area, closure->user_data);
253 
 
254 
  return cif->flags;
255 
}
256 
 
257 
ffi_status
258 
ffi_prep_closure_loc (ffi_closure* closure,
259 
                      ffi_cif* cif,
260 
                      void (*fun)(ffi_cif*,void*,void**,void*),
261 
                      void *user_data,
262 
                      void *codeloc)
263 
{
264 
  FFI_ASSERT (cif->abi == FFI_SYSV);
265 
 
266 
  *(unsigned short *)closure->tramp = 0x207c;
267 
  *(void **)(closure->tramp + 2) = codeloc;
268 
  *(unsigned short *)(closure->tramp + 6) = 0x4ef9;
269 
  if (cif->rtype->type == FFI_TYPE_STRUCT
270 
      && !cif->flags)
271 
    *(void **)(closure->tramp + 8) = ffi_closure_struct_SYSV;
272 
  else
273 
    *(void **)(closure->tramp + 8) = ffi_closure_SYSV;
274 
 
275 
#ifdef __rtems__
276 
  rtems_cache_flush_multiple_data_lines( codeloc, FFI_TRAMPOLINE_SIZE );
277 
#else
278 
  syscall(SYS_cacheflush, codeloc, FLUSH_SCOPE_LINE,
279 
          FLUSH_CACHE_BOTH, FFI_TRAMPOLINE_SIZE);
280 
#endif
281 
 
282 
  closure->cif  = cif;
283 
  closure->user_data = user_data;
284 
  closure->fun  = fun;
285 
 
286 
  return FFI_OK;
287 
}
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