aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/restricted/libffi/src/x86/ffi.c
blob: 9a592185a1d479ddd43b90f2fb3ae0710da73a77 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
/* -----------------------------------------------------------------------
   ffi.c - Copyright (c) 2017  Anthony Green
           Copyright (c) 1996, 1998, 1999, 2001, 2007, 2008  Red Hat, Inc.
           Copyright (c) 2002  Ranjit Mathew
           Copyright (c) 2002  Bo Thorsen
           Copyright (c) 2002  Roger Sayle
           Copyright (C) 2008, 2010  Free Software Foundation, Inc.

   x86 Foreign Function Interface

   Permission is hereby granted, free of charge, to any person obtaining
   a copy of this software and associated documentation files (the
   ``Software''), to deal in the Software without restriction, including
   without limitation the rights to use, copy, modify, merge, publish,
   distribute, sublicense, and/or sell copies of the Software, and to
   permit persons to whom the Software is furnished to do so, subject to
   the following conditions:

   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.
   ----------------------------------------------------------------------- */

#if defined(__i386__) || defined(_M_IX86)
#include <ffi.h>
#include <ffi_common.h>
#include <stdint.h>
#include <stdlib.h>
#include "internal.h"

/* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE;
   all further uses in this file will refer to the 80-bit type.  */
#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
# if FFI_TYPE_LONGDOUBLE != 4
#  error FFI_TYPE_LONGDOUBLE out of date
# endif
#else
# undef FFI_TYPE_LONGDOUBLE
# define FFI_TYPE_LONGDOUBLE 4
#endif

#if defined(__GNUC__) && !defined(__declspec)
# define __declspec(x)  __attribute__((x))
#endif

#if defined(_MSC_VER) && defined(_M_IX86)
/* Stack is not 16-byte aligned on Windows.  */
#define STACK_ALIGN(bytes) (bytes)
#else
#define STACK_ALIGN(bytes) FFI_ALIGN (bytes, 16)
#endif

/* Perform machine dependent cif processing.  */
ffi_status FFI_HIDDEN
ffi_prep_cif_machdep(ffi_cif *cif)
{
  size_t bytes = 0;
  int i, n, flags, cabi = cif->abi;

  switch (cabi)
    {
    case FFI_SYSV:
    case FFI_STDCALL:
    case FFI_THISCALL:
    case FFI_FASTCALL:
    case FFI_MS_CDECL:
    case FFI_PASCAL:
    case FFI_REGISTER:
      break;
    default:
      return FFI_BAD_ABI;
    }

  switch (cif->rtype->type)
    {
    case FFI_TYPE_VOID:
      flags = X86_RET_VOID;
      break;
    case FFI_TYPE_FLOAT:
      flags = X86_RET_FLOAT;
      break;
    case FFI_TYPE_DOUBLE:
      flags = X86_RET_DOUBLE;
      break;
    case FFI_TYPE_LONGDOUBLE:
      flags = X86_RET_LDOUBLE;
      break;
    case FFI_TYPE_UINT8:
      flags = X86_RET_UINT8;
      break;
    case FFI_TYPE_UINT16:
      flags = X86_RET_UINT16;
      break;
    case FFI_TYPE_SINT8:
      flags = X86_RET_SINT8;
      break;
    case FFI_TYPE_SINT16:
      flags = X86_RET_SINT16;
      break;
    case FFI_TYPE_INT:
    case FFI_TYPE_SINT32:
    case FFI_TYPE_UINT32:
    case FFI_TYPE_POINTER:
      flags = X86_RET_INT32;
      break;
    case FFI_TYPE_SINT64:
    case FFI_TYPE_UINT64:
      flags = X86_RET_INT64;
      break;
    case FFI_TYPE_STRUCT:
#ifndef X86
      /* ??? This should be a different ABI rather than an ifdef.  */
      if (cif->rtype->size == 1)
	flags = X86_RET_STRUCT_1B;
      else if (cif->rtype->size == 2)
	flags = X86_RET_STRUCT_2B;
      else if (cif->rtype->size == 4)
	flags = X86_RET_INT32;
      else if (cif->rtype->size == 8)
	flags = X86_RET_INT64;
      else
#endif
	{
	do_struct:
	  switch (cabi)
	    {
	    case FFI_THISCALL:
	    case FFI_FASTCALL:
	    case FFI_STDCALL:
	    case FFI_MS_CDECL:
	      flags = X86_RET_STRUCTARG;
	      break;
	    default:
	      flags = X86_RET_STRUCTPOP;
	      break;
	    }
	  /* Allocate space for return value pointer.  */
	  bytes += FFI_ALIGN (sizeof(void*), FFI_SIZEOF_ARG);
	}
      break;
    case FFI_TYPE_COMPLEX:
      switch (cif->rtype->elements[0]->type)
	{
	case FFI_TYPE_DOUBLE:
	case FFI_TYPE_LONGDOUBLE:
	case FFI_TYPE_SINT64:
	case FFI_TYPE_UINT64:
	  goto do_struct;
	case FFI_TYPE_FLOAT:
	case FFI_TYPE_INT:
	case FFI_TYPE_SINT32:
	case FFI_TYPE_UINT32:
	  flags = X86_RET_INT64;
	  break;
	case FFI_TYPE_SINT16:
	case FFI_TYPE_UINT16:
	  flags = X86_RET_INT32;
	  break;
	case FFI_TYPE_SINT8:
	case FFI_TYPE_UINT8:
	  flags = X86_RET_STRUCT_2B;
	  break;
	default:
	  return FFI_BAD_TYPEDEF;
	}
      break;
    default:
      return FFI_BAD_TYPEDEF;
    }
  cif->flags = flags;

  for (i = 0, n = cif->nargs; i < n; i++)
    {
      ffi_type *t = cif->arg_types[i];

      bytes = FFI_ALIGN (bytes, t->alignment);
      bytes += FFI_ALIGN (t->size, FFI_SIZEOF_ARG);
    }
  cif->bytes = bytes;

  return FFI_OK;
}

static ffi_arg
extend_basic_type(void *arg, int type)
{
  switch (type)
    {
    case FFI_TYPE_SINT8:
      return *(SINT8 *)arg;
    case FFI_TYPE_UINT8:
      return *(UINT8 *)arg;
    case FFI_TYPE_SINT16:
      return *(SINT16 *)arg;
    case FFI_TYPE_UINT16:
      return *(UINT16 *)arg;

    case FFI_TYPE_SINT32:
    case FFI_TYPE_UINT32:
    case FFI_TYPE_POINTER:
    case FFI_TYPE_FLOAT:
      return *(UINT32 *)arg;

    default:
      abort();
    }
}

struct call_frame
{
  void *ebp;		/* 0 */
  void *retaddr;	/* 4 */
  void (*fn)(void);	/* 8 */
  int flags;		/* 12 */
  void *rvalue;		/* 16 */
  unsigned regs[3];	/* 20-28 */
};

struct abi_params
{
  int dir;		/* parameter growth direction */
  int static_chain;	/* the static chain register used by gcc */
  int nregs;		/* number of register parameters */
  int regs[3];
};

static const struct abi_params abi_params[FFI_LAST_ABI] = {
  [FFI_SYSV] = { 1, R_ECX, 0 },
  [FFI_THISCALL] = { 1, R_EAX, 1, { R_ECX } },
  [FFI_FASTCALL] = { 1, R_EAX, 2, { R_ECX, R_EDX } },
  [FFI_STDCALL] = { 1, R_ECX, 0 },
  [FFI_PASCAL] = { -1, R_ECX, 0 },
  /* ??? No defined static chain; gcc does not support REGISTER.  */
  [FFI_REGISTER] = { -1, R_ECX, 3, { R_EAX, R_EDX, R_ECX } },
  [FFI_MS_CDECL] = { 1, R_ECX, 0 }
};

#ifdef HAVE_FASTCALL
  #ifdef _MSC_VER
    #define FFI_DECLARE_FASTCALL __fastcall
  #else
    #define FFI_DECLARE_FASTCALL __declspec(fastcall)
  #endif
#else
  #define FFI_DECLARE_FASTCALL
#endif

extern void FFI_DECLARE_FASTCALL ffi_call_i386(struct call_frame *, char *) FFI_HIDDEN;

static void
ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue,
	      void **avalue, void *closure)
{
  size_t rsize, bytes;
  struct call_frame *frame;
  char *stack, *argp;
  ffi_type **arg_types;
  int flags, cabi, i, n, dir, narg_reg;
  const struct abi_params *pabi;

  flags = cif->flags;
  cabi = cif->abi;
  pabi = &abi_params[cabi];
  dir = pabi->dir;

  rsize = 0;
  if (rvalue == NULL)
    {
      switch (flags)
	{
	case X86_RET_FLOAT:
	case X86_RET_DOUBLE:
	case X86_RET_LDOUBLE:
	case X86_RET_STRUCTPOP:
	case X86_RET_STRUCTARG:
	  /* The float cases need to pop the 387 stack.
	     The struct cases need to pass a valid pointer to the callee.  */
	  rsize = cif->rtype->size;
	  break;
	default:
	  /* We can pretend that the callee returns nothing.  */
	  flags = X86_RET_VOID;
	  break;
	}
    }

  bytes = STACK_ALIGN (cif->bytes);
  stack = alloca(bytes + sizeof(*frame) + rsize);
  argp = (dir < 0 ? stack + bytes : stack);
  frame = (struct call_frame *)(stack + bytes);
  if (rsize)
    rvalue = frame + 1;

  frame->fn = fn;
  frame->flags = flags;
  frame->rvalue = rvalue;
  frame->regs[pabi->static_chain] = (unsigned)closure;

  narg_reg = 0;
  switch (flags)
    {
    case X86_RET_STRUCTARG:
      /* The pointer is passed as the first argument.  */
      if (pabi->nregs > 0)
	{
	  frame->regs[pabi->regs[0]] = (unsigned)rvalue;
	  narg_reg = 1;
	  break;
	}
      /* fallthru */
    case X86_RET_STRUCTPOP:
      *(void **)argp = rvalue;
      argp += sizeof(void *);
      break;
    }

  arg_types = cif->arg_types;
  for (i = 0, n = cif->nargs; i < n; i++)
    {
      ffi_type *ty = arg_types[i];
      void *valp = avalue[i];
      size_t z = ty->size;
      int t = ty->type;

      if (z <= FFI_SIZEOF_ARG && t != FFI_TYPE_STRUCT)
        {
	  ffi_arg val = extend_basic_type (valp, t);

	  if (t != FFI_TYPE_FLOAT && narg_reg < pabi->nregs)
	    frame->regs[pabi->regs[narg_reg++]] = val;
	  else if (dir < 0)
	    {
	      argp -= 4;
	      *(ffi_arg *)argp = val;
	    }
	  else
	    {
	      *(ffi_arg *)argp = val;
	      argp += 4;
	    }
	}
      else
	{
	  size_t za = FFI_ALIGN (z, FFI_SIZEOF_ARG);
	  size_t align = FFI_SIZEOF_ARG;

	  /* Issue 434: For thiscall and fastcall, if the paramter passed
	     as 64-bit integer or struct, all following integer paramters
	     will be passed on stack.  */
	  if ((cabi == FFI_THISCALL || cabi == FFI_FASTCALL)
	      && (t == FFI_TYPE_SINT64
		  || t == FFI_TYPE_UINT64
		  || t == FFI_TYPE_STRUCT))
	    narg_reg = 2;

	  /* Alignment rules for arguments are quite complex.  Vectors and
	     structures with 16 byte alignment get it.  Note that long double
	     on Darwin does have 16 byte alignment, and does not get this
	     alignment if passed directly; a structure with a long double
	     inside, however, would get 16 byte alignment.  Since libffi does
	     not support vectors, we need non concern ourselves with other
	     cases.  */
	  if (t == FFI_TYPE_STRUCT && ty->alignment >= 16)
	    align = 16;
	    
	  if (dir < 0)
	    {
	      /* ??? These reverse argument ABIs are probably too old
		 to have cared about alignment.  Someone should check.  */
	      argp -= za;
	      memcpy (argp, valp, z);
	    }
	  else
	    {
	      argp = (char *)FFI_ALIGN (argp, align);
	      memcpy (argp, valp, z);
	      argp += za;
	    }
	}
    }
  FFI_ASSERT (dir > 0 || argp == stack);

  ffi_call_i386 (frame, stack);
}

void
ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
{
  ffi_call_int (cif, fn, rvalue, avalue, NULL);
}

void
ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue,
	     void **avalue, void *closure)
{
  ffi_call_int (cif, fn, rvalue, avalue, closure);
}

/** private members **/

void FFI_HIDDEN ffi_closure_i386(void);
void FFI_HIDDEN ffi_closure_STDCALL(void);
void FFI_HIDDEN ffi_closure_REGISTER(void);

struct closure_frame
{
  unsigned rettemp[4];				/* 0 */
  unsigned regs[3];				/* 16-24 */
  ffi_cif *cif;					/* 28 */
  void (*fun)(ffi_cif*,void*,void**,void*);	/* 32 */
  void *user_data;				/* 36 */
};

int FFI_HIDDEN FFI_DECLARE_FASTCALL
ffi_closure_inner (struct closure_frame *frame, char *stack)
{
  ffi_cif *cif = frame->cif;
  int cabi, i, n, flags, dir, narg_reg;
  const struct abi_params *pabi;
  ffi_type **arg_types;
  char *argp;
  void *rvalue;
  void **avalue;

  cabi = cif->abi;
  flags = cif->flags;
  narg_reg = 0;
  rvalue = frame->rettemp;
  pabi = &abi_params[cabi];
  dir = pabi->dir;
  argp = (dir < 0 ? stack + STACK_ALIGN (cif->bytes) : stack);

  switch (flags)
    {
    case X86_RET_STRUCTARG:
      if (pabi->nregs > 0)
	{
	  rvalue = (void *)frame->regs[pabi->regs[0]];
	  narg_reg = 1;
	  frame->rettemp[0] = (unsigned)rvalue;
	  break;
	}
      /* fallthru */
    case X86_RET_STRUCTPOP:
      rvalue = *(void **)argp;
      argp += sizeof(void *);
      frame->rettemp[0] = (unsigned)rvalue;
      break;
    }

  n = cif->nargs;
  avalue = alloca(sizeof(void *) * n);

  arg_types = cif->arg_types;
  for (i = 0; i < n; ++i)
    {
      ffi_type *ty = arg_types[i];
      size_t z = ty->size;
      int t = ty->type;
      void *valp;

      if (z <= FFI_SIZEOF_ARG && t != FFI_TYPE_STRUCT)
	{
	  if (t != FFI_TYPE_FLOAT && narg_reg < pabi->nregs)
	    valp = &frame->regs[pabi->regs[narg_reg++]];
	  else if (dir < 0)
	    {
	      argp -= 4;
	      valp = argp;
	    }
	  else
	    {
	      valp = argp;
	      argp += 4;
	    }
	}
      else
	{
	  size_t za = FFI_ALIGN (z, FFI_SIZEOF_ARG);
	  size_t align = FFI_SIZEOF_ARG;

	  /* See the comment in ffi_call_int.  */
	  if (t == FFI_TYPE_STRUCT && ty->alignment >= 16)
	    align = 16;

	  /* Issue 434: For thiscall and fastcall, if the paramter passed
	     as 64-bit integer or struct, all following integer paramters
	     will be passed on stack.  */
	  if ((cabi == FFI_THISCALL || cabi == FFI_FASTCALL)
	      && (t == FFI_TYPE_SINT64
		  || t == FFI_TYPE_UINT64
		  || t == FFI_TYPE_STRUCT))
	    narg_reg = 2;

	  if (dir < 0)
	    {
	      /* ??? These reverse argument ABIs are probably too old
		 to have cared about alignment.  Someone should check.  */
	      argp -= za;
	      valp = argp;
	    }
	  else
	    {
	      argp = (char *)FFI_ALIGN (argp, align);
	      valp = argp;
	      argp += za;
	    }
	}

      avalue[i] = valp;
    }

  frame->fun (cif, rvalue, avalue, frame->user_data);

  if (cabi == FFI_STDCALL)
    return flags + (cif->bytes << X86_RET_POP_SHIFT);
  else
    return flags;
}

ffi_status
ffi_prep_closure_loc (ffi_closure* closure,
                      ffi_cif* cif,
                      void (*fun)(ffi_cif*,void*,void**,void*),
                      void *user_data,
                      void *codeloc)
{
  char *tramp = closure->tramp;
  void (*dest)(void);
  int op = 0xb8;  /* movl imm, %eax */

  switch (cif->abi)
    {
    case FFI_SYSV:
    case FFI_THISCALL:
    case FFI_FASTCALL:
    case FFI_MS_CDECL:
      dest = ffi_closure_i386;
      break;
    case FFI_STDCALL:
    case FFI_PASCAL:
      dest = ffi_closure_STDCALL;
      break;
    case FFI_REGISTER:
      dest = ffi_closure_REGISTER;
      op = 0x68;  /* pushl imm */
      break;
    default:
      return FFI_BAD_ABI;
    }

  /* movl or pushl immediate.  */
  tramp[0] = op;
  *(void **)(tramp + 1) = codeloc;

  /* jmp dest */
  tramp[5] = 0xe9;
  *(unsigned *)(tramp + 6) = (unsigned)dest - ((unsigned)codeloc + 10);

  closure->cif = cif;
  closure->fun = fun;
  closure->user_data = user_data;

  return FFI_OK;
}

void FFI_HIDDEN ffi_go_closure_EAX(void);
void FFI_HIDDEN ffi_go_closure_ECX(void);
void FFI_HIDDEN ffi_go_closure_STDCALL(void);

ffi_status
ffi_prep_go_closure (ffi_go_closure* closure, ffi_cif* cif,
		     void (*fun)(ffi_cif*,void*,void**,void*))
{
  void (*dest)(void);

  switch (cif->abi)
    {
    case FFI_SYSV:
    case FFI_MS_CDECL:
      dest = ffi_go_closure_ECX;
      break;
    case FFI_THISCALL:
    case FFI_FASTCALL:
      dest = ffi_go_closure_EAX;
      break;
    case FFI_STDCALL:
    case FFI_PASCAL:
      dest = ffi_go_closure_STDCALL;
      break;
    case FFI_REGISTER:
    default:
      return FFI_BAD_ABI;
    }

  closure->tramp = dest;
  closure->cif = cif;
  closure->fun = fun;

  return FFI_OK;
}

/* ------- Native raw API support -------------------------------- */

#if !FFI_NO_RAW_API

void FFI_HIDDEN ffi_closure_raw_SYSV(void);
void FFI_HIDDEN ffi_closure_raw_THISCALL(void);

ffi_status
ffi_prep_raw_closure_loc (ffi_raw_closure *closure,
                          ffi_cif *cif,
                          void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
                          void *user_data,
                          void *codeloc)
{
  char *tramp = closure->tramp;
  void (*dest)(void);
  int i;

  /* We currently don't support certain kinds of arguments for raw
     closures.  This should be implemented by a separate assembly
     language routine, since it would require argument processing,
     something we don't do now for performance.  */
  for (i = cif->nargs-1; i >= 0; i--)
    switch (cif->arg_types[i]->type)
      {
      case FFI_TYPE_STRUCT:
      case FFI_TYPE_LONGDOUBLE:
	return FFI_BAD_TYPEDEF;
      }

  switch (cif->abi)
    {
    case FFI_THISCALL:
      dest = ffi_closure_raw_THISCALL;
      break;
    case FFI_SYSV:
      dest = ffi_closure_raw_SYSV;
      break;
    default:
      return FFI_BAD_ABI;
    }

  /* movl imm, %eax.  */
  tramp[0] = 0xb8;
  *(void **)(tramp + 1) = codeloc;

  /* jmp dest */
  tramp[5] = 0xe9;
  *(unsigned *)(tramp + 6) = (unsigned)dest - ((unsigned)codeloc + 10);

  closure->cif = cif;
  closure->fun = fun;
  closure->user_data = user_data;

  return FFI_OK;
}

void
ffi_raw_call(ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *avalue)
{
  size_t rsize, bytes;
  struct call_frame *frame;
  char *stack, *argp;
  ffi_type **arg_types;
  int flags, cabi, i, n, narg_reg;
  const struct abi_params *pabi;

  flags = cif->flags;
  cabi = cif->abi;
  pabi = &abi_params[cabi];

  rsize = 0;
  if (rvalue == NULL)
    {
      switch (flags)
	{
	case X86_RET_FLOAT:
	case X86_RET_DOUBLE:
	case X86_RET_LDOUBLE:
	case X86_RET_STRUCTPOP:
	case X86_RET_STRUCTARG:
	  /* The float cases need to pop the 387 stack.
	     The struct cases need to pass a valid pointer to the callee.  */
	  rsize = cif->rtype->size;
	  break;
	default:
	  /* We can pretend that the callee returns nothing.  */
	  flags = X86_RET_VOID;
	  break;
	}
    }

  bytes = STACK_ALIGN (cif->bytes);
  argp = stack =
      (void *)((uintptr_t)alloca(bytes + sizeof(*frame) + rsize + 15) & ~16);
  frame = (struct call_frame *)(stack + bytes);
  if (rsize)
    rvalue = frame + 1;

  frame->fn = fn;
  frame->flags = flags;
  frame->rvalue = rvalue;

  narg_reg = 0;
  switch (flags)
    {
    case X86_RET_STRUCTARG:
      /* The pointer is passed as the first argument.  */
      if (pabi->nregs > 0)
	{
	  frame->regs[pabi->regs[0]] = (unsigned)rvalue;
	  narg_reg = 1;
	  break;
	}
      /* fallthru */
    case X86_RET_STRUCTPOP:
      *(void **)argp = rvalue;
      argp += sizeof(void *);
      bytes -= sizeof(void *);
      break;
    }

  arg_types = cif->arg_types;
  for (i = 0, n = cif->nargs; narg_reg < pabi->nregs && i < n; i++)
    {
      ffi_type *ty = arg_types[i];
      size_t z = ty->size;
      int t = ty->type;

      if (z <= FFI_SIZEOF_ARG && t != FFI_TYPE_STRUCT && t != FFI_TYPE_FLOAT)
	{
	  ffi_arg val = extend_basic_type (avalue, t);
	  frame->regs[pabi->regs[narg_reg++]] = val;
	  z = FFI_SIZEOF_ARG;
	}
      else
	{
	  memcpy (argp, avalue, z);
	  z = FFI_ALIGN (z, FFI_SIZEOF_ARG);
	  argp += z;
	}
      avalue += z;
      bytes -= z;
    }
  if (i < n)
    memcpy (argp, avalue, bytes);

  ffi_call_i386 (frame, stack);
}
#endif /* !FFI_NO_RAW_API */
#endif /* __i386__ */