summaryrefslogtreecommitdiff
path: root/libffi/src/powerpc/ffi_darwin.c
blob: ee03dab698981e0bc43d94f0396e28af414c2e13 (plain)
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
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
/* -----------------------------------------------------------------------
   ffi_darwin.c

   Copyright (C) 1998 Geoffrey Keating
   Copyright (C) 2001 John Hornkvist
   Copyright (C) 2002, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.

   FFI support for Darwin and AIX.
   
   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 AUTHOR 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.
   ----------------------------------------------------------------------- */

#include <ffi.h>
#include <ffi_common.h>

#include <stdlib.h>

extern void ffi_closure_ASM (void);

enum {
  /* The assembly depends on these exact flags.  
     For Darwin64 (when FLAG_RETURNS_STRUCT is set):
       FLAG_RETURNS_FP indicates that the structure embeds FP data.
       FLAG_RETURNS_128BITS signals a special struct size that is not
       expanded for float content.  */
  FLAG_RETURNS_128BITS	= 1 << (31-31), /* These go in cr7  */
  FLAG_RETURNS_NOTHING	= 1 << (31-30),
  FLAG_RETURNS_FP	= 1 << (31-29),
  FLAG_RETURNS_64BITS	= 1 << (31-28),

  FLAG_RETURNS_STRUCT	= 1 << (31-27), /* This goes in cr6  */

  FLAG_ARG_NEEDS_COPY   = 1 << (31- 7),
  FLAG_FP_ARGUMENTS     = 1 << (31- 6), /* cr1.eq; specified by ABI  */
  FLAG_4_GPR_ARGUMENTS  = 1 << (31- 5),
  FLAG_RETVAL_REFERENCE = 1 << (31- 4)
};

/* About the DARWIN ABI.  */
enum {
  NUM_GPR_ARG_REGISTERS = 8,
  NUM_FPR_ARG_REGISTERS = 13,
  LINKAGE_AREA_GPRS = 6
};

enum { ASM_NEEDS_REGISTERS = 4 }; /* r28-r31 */

/* ffi_prep_args is called by the assembly routine once stack space
   has been allocated for the function's arguments.
   
   m32/m64

   The stack layout we want looks like this:

   |   Return address from ffi_call_DARWIN      |	higher addresses
   |--------------------------------------------|
   |   Previous backchain pointer	4/8	|	stack pointer here
   |--------------------------------------------|<+ <<<	on entry to
   |   ASM_NEEDS_REGISTERS=r28-r31   4*(4/8)	| |	ffi_call_DARWIN
   |--------------------------------------------| |
   |   When we have any FP activity... the	| |
   |   FPRs occupy NUM_FPR_ARG_REGISTERS slots	| |
   |   here fp13 .. fp1 from high to low addr.	| |
   ~						~ ~
   |   Parameters      (at least 8*4/8=32/64)	| | NUM_GPR_ARG_REGISTERS
   |--------------------------------------------| |
   |   TOC=R2 (AIX) Reserved (Darwin)   4/8	| |
   |--------------------------------------------| |	stack	|
   |   Reserved                       2*4/8	| |	grows	|
   |--------------------------------------------| |	down	V
   |   Space for callee's LR		4/8	| |
   |--------------------------------------------| |	lower addresses
   |   Saved CR [low word for m64]      4/8	| |
   |--------------------------------------------| |     stack pointer here
   |   Current backchain pointer	4/8	|-/	during
   |--------------------------------------------|   <<<	ffi_call_DARWIN

   */

#if defined(POWERPC_DARWIN64)
static void
darwin64_pass_struct_by_value 
  (ffi_type *, char *, unsigned, unsigned *, double **, unsigned long **);
#endif

/* This depends on GPR_SIZE = sizeof (unsigned long) */

void
ffi_prep_args (extended_cif *ecif, unsigned long *const stack)
{
  const unsigned bytes = ecif->cif->bytes;
  const unsigned flags = ecif->cif->flags;
  const unsigned nargs = ecif->cif->nargs;
#if !defined(POWERPC_DARWIN64) 
  const ffi_abi abi = ecif->cif->abi;
#endif

  /* 'stacktop' points at the previous backchain pointer.  */
  unsigned long *const stacktop = stack + (bytes / sizeof(unsigned long));

  /* 'fpr_base' points at the space for fpr1, and grows upwards as
     we use FPR registers.  */
  double *fpr_base = (double *) (stacktop - ASM_NEEDS_REGISTERS) - NUM_FPR_ARG_REGISTERS;
  int gp_count = 0, fparg_count = 0;

  /* 'next_arg' grows up as we put parameters in it.  */
  unsigned long *next_arg = stack + LINKAGE_AREA_GPRS; /* 6 reserved positions.  */

  int i;
  double double_tmp;
  void **p_argv = ecif->avalue;
  unsigned long gprvalue;
  ffi_type** ptr = ecif->cif->arg_types;
#if !defined(POWERPC_DARWIN64) 
  char *dest_cpy;
#endif
  unsigned size_al = 0;

  /* Check that everything starts aligned properly.  */
  FFI_ASSERT(((unsigned) (char *) stack & 0xF) == 0);
  FFI_ASSERT(((unsigned) (char *) stacktop & 0xF) == 0);
  FFI_ASSERT((bytes & 0xF) == 0);

  /* Deal with return values that are actually pass-by-reference.
     Rule:
     Return values are referenced by r3, so r4 is the first parameter.  */

  if (flags & FLAG_RETVAL_REFERENCE)
    *next_arg++ = (unsigned long) (char *) ecif->rvalue;

  /* Now for the arguments.  */
  for (i = nargs; i > 0; i--, ptr++, p_argv++)
    {
      switch ((*ptr)->type)
	{
	/* If a floating-point parameter appears before all of the general-
	   purpose registers are filled, the corresponding GPRs that match
	   the size of the floating-point parameter are skipped.  */
	case FFI_TYPE_FLOAT:
	  double_tmp = *(float *) *p_argv;
	  if (fparg_count < NUM_FPR_ARG_REGISTERS)
	    *fpr_base++ = double_tmp;
#if defined(POWERPC_DARWIN)
	  *(float *)next_arg = *(float *) *p_argv;
#else
	  *(double *)next_arg = double_tmp;
#endif
	  next_arg++;
	  gp_count++;
	  fparg_count++;
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;

	case FFI_TYPE_DOUBLE:
	  double_tmp = *(double *) *p_argv;
	  if (fparg_count < NUM_FPR_ARG_REGISTERS)
	    *fpr_base++ = double_tmp;
	  *(double *)next_arg = double_tmp;
#ifdef POWERPC64
	  next_arg++;
	  gp_count++;
#else
	  next_arg += 2;
	  gp_count += 2;
#endif
	  fparg_count++;
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE

	case FFI_TYPE_LONGDOUBLE:
#  if defined(POWERPC64) && !defined(POWERPC_DARWIN64)
	  /* ??? This will exceed the regs count when the value starts at fp13
	     and it will not put the extra bit on the stack.  */
	  if (fparg_count < NUM_FPR_ARG_REGISTERS)
	    *(long double *) fpr_base++ = *(long double *) *p_argv;
	  else
	    *(long double *) next_arg = *(long double *) *p_argv;
	  next_arg += 2;
	  fparg_count += 2;
#  else
	  double_tmp = ((double *) *p_argv)[0];
	  if (fparg_count < NUM_FPR_ARG_REGISTERS)
	    *fpr_base++ = double_tmp;
	  *(double *) next_arg = double_tmp;
#    if defined(POWERPC_DARWIN64)
	  next_arg++;
	  gp_count++;
#    else
	  next_arg += 2;
	  gp_count += 2;
#    endif
	  fparg_count++;
	  double_tmp = ((double *) *p_argv)[1];
	  if (fparg_count < NUM_FPR_ARG_REGISTERS)
	    *fpr_base++ = double_tmp;
	  *(double *) next_arg = double_tmp;
#    if defined(POWERPC_DARWIN64)
	  next_arg++;
	  gp_count++;
#    else
	  next_arg += 2;
	  gp_count += 2;
#    endif
	  fparg_count++;
#  endif
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;
#endif
	case FFI_TYPE_UINT64:
	case FFI_TYPE_SINT64:
#ifdef POWERPC64
	  gprvalue = *(long long *) *p_argv;
	  goto putgpr;
#else
	  *(long long *) next_arg = *(long long *) *p_argv;
	  next_arg += 2;
	  gp_count += 2;
#endif
	  break;
	case FFI_TYPE_POINTER:
	  gprvalue = *(unsigned long *) *p_argv;
	  goto putgpr;
	case FFI_TYPE_UINT8:
	  gprvalue = *(unsigned char *) *p_argv;
	  goto putgpr;
	case FFI_TYPE_SINT8:
	  gprvalue = *(signed char *) *p_argv;
	  goto putgpr;
	case FFI_TYPE_UINT16:
	  gprvalue = *(unsigned short *) *p_argv;
	  goto putgpr;
	case FFI_TYPE_SINT16:
	  gprvalue = *(signed short *) *p_argv;
	  goto putgpr;

	case FFI_TYPE_STRUCT:
	  size_al = (*ptr)->size;
#if defined(POWERPC_DARWIN64)
	  next_arg = (unsigned long *)ALIGN((char *)next_arg, (*ptr)->alignment);
	  darwin64_pass_struct_by_value (*ptr, (char *) *p_argv, 
					 (unsigned) size_al,
					 (unsigned int *) &fparg_count,
					 &fpr_base, &next_arg);
#else
	  dest_cpy = (char *) next_arg;

	  /* If the first member of the struct is a double, then include enough
	     padding in the struct size to align it to double-word.  */
	  if ((*ptr)->elements[0]->type == FFI_TYPE_DOUBLE)
	    size_al = ALIGN((*ptr)->size, 8);

#  if defined(POWERPC64) 
	  FFI_ASSERT (abi != FFI_DARWIN);
	  memcpy ((char *) dest_cpy, (char *) *p_argv, size_al);
	  next_arg += (size_al + 7) / 8;
#  else
	  /* Structures that match the basic modes (QI 1 byte, HI 2 bytes,
	     SI 4 bytes) are aligned as if they were those modes.
	     Structures with 3 byte in size are padded upwards.  */
	  if (size_al < 3 && abi == FFI_DARWIN)
	    dest_cpy += 4 - size_al;

	  memcpy((char *) dest_cpy, (char *) *p_argv, size_al);
	  next_arg += (size_al + 3) / 4;
#  endif
#endif
	  break;

	case FFI_TYPE_INT:
	case FFI_TYPE_SINT32:
	  gprvalue = *(signed int *) *p_argv;
	  goto putgpr;

	case FFI_TYPE_UINT32:
	  gprvalue = *(unsigned int *) *p_argv;
	putgpr:
	  *next_arg++ = gprvalue;
	  gp_count++;
	  break;
	default:
	  break;
	}
    }

  /* Check that we didn't overrun the stack...  */
  //FFI_ASSERT(gpr_base <= stacktop - ASM_NEEDS_REGISTERS);
  //FFI_ASSERT((unsigned *)fpr_base
  //	     <= stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS);
  //FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4);
}

#if defined(POWERPC_DARWIN64)

/* See if we can put some of the struct into fprs.
   This should not be called for structures of size 16 bytes, since these are not
   broken out this way.  */
static void
darwin64_scan_struct_for_floats (ffi_type *s, unsigned *nfpr)
{
  int i;

  FFI_ASSERT (s->type == FFI_TYPE_STRUCT)

  for (i = 0; s->elements[i] != NULL; i++)
    {
      ffi_type *p = s->elements[i];
      switch (p->type)
	{
	  case FFI_TYPE_STRUCT:
	    darwin64_scan_struct_for_floats (p, nfpr);
	    break;
	  case FFI_TYPE_LONGDOUBLE:
	    (*nfpr) += 2;
	    break;
	  case FFI_TYPE_DOUBLE:
	  case FFI_TYPE_FLOAT:
	    (*nfpr) += 1;
	    break;
	  default:
	    break;    
	}
    }
}

static int
darwin64_struct_size_exceeds_gprs_p (ffi_type *s, char *src, unsigned *nfpr)
{
  unsigned struct_offset=0, i;

  for (i = 0; s->elements[i] != NULL; i++)
    {
      char *item_base;
      ffi_type *p = s->elements[i];
      /* Find the start of this item (0 for the first one).  */
      if (i > 0)
        struct_offset = ALIGN(struct_offset, p->alignment);

      item_base = src + struct_offset;

      switch (p->type)
	{
	  case FFI_TYPE_STRUCT:
	    if (darwin64_struct_size_exceeds_gprs_p (p, item_base, nfpr))
	      return 1;
	    break;
	  case FFI_TYPE_LONGDOUBLE:
	    if (*nfpr >= NUM_FPR_ARG_REGISTERS)
	      return 1;
	    (*nfpr) += 1;
	    item_base += 8;
	  /* FALL THROUGH */
	  case FFI_TYPE_DOUBLE:
	    if (*nfpr >= NUM_FPR_ARG_REGISTERS)
	      return 1;
	    (*nfpr) += 1;
	    break;
	  case FFI_TYPE_FLOAT:
	    if (*nfpr >= NUM_FPR_ARG_REGISTERS)
	      return 1;
	    (*nfpr) += 1;
	    break;
	  default:
	    /* If we try and place any item, that is non-float, once we've
	       exceeded the 8 GPR mark, then we can't fit the struct.  */
	    if ((unsigned long)item_base >= 8*8) 
	      return 1;
	    break;    
	}
      /* now count the size of what we just used.  */
      struct_offset += p->size;
    }
  return 0;
}

/* Can this struct be returned by value?  */
int 
darwin64_struct_ret_by_value_p (ffi_type *s)
{
  unsigned nfp = 0;

  FFI_ASSERT (s && s->type == FFI_TYPE_STRUCT);
  
  /* The largest structure we can return is 8long + 13 doubles.  */
  if (s->size > 168)
    return 0;
  
  /* We can't pass more than 13 floats.  */
  darwin64_scan_struct_for_floats (s, &nfp);
  if (nfp > 13)
    return 0;
  
  /* If there are not too many floats, and the struct is
     small enough to accommodate in the GPRs, then it must be OK.  */
  if (s->size <= 64)
    return 1;
  
  /* Well, we have to look harder.  */
  nfp = 0;
  if (darwin64_struct_size_exceeds_gprs_p (s, NULL, &nfp))
    return 0;
  
  return 1;
}

void
darwin64_pass_struct_floats (ffi_type *s, char *src, 
			     unsigned *nfpr, double **fprs)
{
  int i;
  double *fpr_base = *fprs;
  unsigned struct_offset = 0;

  /* We don't assume anything about the alignment of the source.  */
  for (i = 0; s->elements[i] != NULL; i++)
    {
      char *item_base;
      ffi_type *p = s->elements[i];
      /* Find the start of this item (0 for the first one).  */
      if (i > 0)
        struct_offset = ALIGN(struct_offset, p->alignment);
      item_base = src + struct_offset;

      switch (p->type)
	{
	  case FFI_TYPE_STRUCT:
	    darwin64_pass_struct_floats (p, item_base, nfpr,
					   &fpr_base);
	    break;
	  case FFI_TYPE_LONGDOUBLE:
	    if (*nfpr < NUM_FPR_ARG_REGISTERS)
	      *fpr_base++ = *(double *)item_base;
	    (*nfpr) += 1;
	    item_base += 8;
	  /* FALL THROUGH */
	  case FFI_TYPE_DOUBLE:
	    if (*nfpr < NUM_FPR_ARG_REGISTERS)
	      *fpr_base++ = *(double *)item_base;
	    (*nfpr) += 1;
	    break;
	  case FFI_TYPE_FLOAT:
	    if (*nfpr < NUM_FPR_ARG_REGISTERS)
	      *fpr_base++ = (double) *(float *)item_base;
	    (*nfpr) += 1;
	    break;
	  default:
	    break;    
	}
      /* now count the size of what we just used.  */
      struct_offset += p->size;
    }
  /* Update the scores.  */
  *fprs = fpr_base;
}

/* Darwin64 special rules.
   Break out a struct into params and float registers.  */
static void
darwin64_pass_struct_by_value (ffi_type *s, char *src, unsigned size,
			       unsigned *nfpr, double **fprs, unsigned long **arg)
{
  unsigned long *next_arg = *arg;
  char *dest_cpy = (char *)next_arg;

  FFI_ASSERT (s->type == FFI_TYPE_STRUCT)

  if (!size)
    return;

  /* First... special cases.  */
  if (size < 3
      || (size == 4 
	  && s->elements[0] 
	  && s->elements[0]->type != FFI_TYPE_FLOAT))
    {
      /* Must be at least one GPR, padding is unspecified in value, 
	 let's make it zero.  */
      *next_arg = 0UL; 
      dest_cpy += 8 - size;
      memcpy ((char *) dest_cpy, src, size);
      next_arg++;
    }
  else if (size == 16)
    {
      memcpy ((char *) dest_cpy, src, size);
      next_arg += 2;
    }
  else
    {
      /* now the general case, we consider embedded floats.  */
      memcpy ((char *) dest_cpy, src, size);
      darwin64_pass_struct_floats (s, src, nfpr, fprs);
      next_arg += (size+7)/8;
    }
    
  *arg = next_arg;
}

double *
darwin64_struct_floats_to_mem (ffi_type *s, char *dest, double *fprs, unsigned *nf)
{
  int i;
  unsigned struct_offset = 0;

  /* We don't assume anything about the alignment of the source.  */
  for (i = 0; s->elements[i] != NULL; i++)
    {
      char *item_base;
      ffi_type *p = s->elements[i];
      /* Find the start of this item (0 for the first one).  */
      if (i > 0)
        struct_offset = ALIGN(struct_offset, p->alignment);
      item_base = dest + struct_offset;

      switch (p->type)
	{
	  case FFI_TYPE_STRUCT:
	    fprs = darwin64_struct_floats_to_mem (p, item_base, fprs, nf);
	    break;
	  case FFI_TYPE_LONGDOUBLE:
	    if (*nf < NUM_FPR_ARG_REGISTERS)
	      {
		*(double *)item_base = *fprs++ ;
		(*nf) += 1;
	      }
	    item_base += 8;
	  /* FALL THROUGH */
	  case FFI_TYPE_DOUBLE:
	    if (*nf < NUM_FPR_ARG_REGISTERS)
	      {
		*(double *)item_base = *fprs++ ;
		(*nf) += 1;
	      }
	    break;
	  case FFI_TYPE_FLOAT:
	    if (*nf < NUM_FPR_ARG_REGISTERS)
	      {
		*(float *)item_base = (float) *fprs++ ;
		(*nf) += 1;
	      }
	    break;
	  default:
	    break;    
	}
      /* now count the size of what we just used.  */
      struct_offset += p->size;
    }
  return fprs;
}

#endif

/* Adjust the size of S to be correct for Darwin.
   On Darwin m32, the first field of a structure has natural alignment.  
   On Darwin m64, all fields have natural alignment.  */

static void
darwin_adjust_aggregate_sizes (ffi_type *s)
{
  int i;

  if (s->type != FFI_TYPE_STRUCT)
    return;

  s->size = 0;
  for (i = 0; s->elements[i] != NULL; i++)
    {
      ffi_type *p;
      int align;
      
      p = s->elements[i];
      if (p->type == FFI_TYPE_STRUCT)
	darwin_adjust_aggregate_sizes (p);
#if defined(POWERPC_DARWIN64)
      /* Natural alignment for all items.  */
      align = p->alignment;
#else
      /* Natrual alignment for the first item... */
      if (i == 0)
	align = p->alignment;
      else if (p->alignment == 16 || p->alignment < 4)
	/* .. subsequent items with vector or align < 4 have natural align.  */
	align = p->alignment;
      else
	/* .. or align is 4.  */
	align = 4;
#endif
      /* Pad, if necessary, before adding the current item.  */
      s->size = ALIGN(s->size, align) + p->size;
    }
  
  s->size = ALIGN(s->size, s->alignment);
  
  /* This should not be necessary on m64, but harmless.  */
  if (s->elements[0]->type == FFI_TYPE_UINT64
      || s->elements[0]->type == FFI_TYPE_SINT64
      || s->elements[0]->type == FFI_TYPE_DOUBLE
      || s->elements[0]->alignment == 8)
    s->alignment = s->alignment > 8 ? s->alignment : 8;
  /* Do not add additional tail padding.  */
}

/* Adjust the size of S to be correct for AIX.
   Word-align double unless it is the first member of a structure.  */

static void
aix_adjust_aggregate_sizes (ffi_type *s)
{
  int i;

  if (s->type != FFI_TYPE_STRUCT)
    return;

  s->size = 0;
  for (i = 0; s->elements[i] != NULL; i++)
    {
      ffi_type *p;
      int align;
      
      p = s->elements[i];
      aix_adjust_aggregate_sizes (p);
      align = p->alignment;
      if (i != 0 && p->type == FFI_TYPE_DOUBLE)
	align = 4;
      s->size = ALIGN(s->size, align) + p->size;
    }
  
  s->size = ALIGN(s->size, s->alignment);
  
  if (s->elements[0]->type == FFI_TYPE_UINT64
      || s->elements[0]->type == FFI_TYPE_SINT64
      || s->elements[0]->type == FFI_TYPE_DOUBLE
      || s->elements[0]->alignment == 8)
    s->alignment = s->alignment > 8 ? s->alignment : 8;
  /* Do not add additional tail padding.  */
}

/* Perform machine dependent cif processing.  */
ffi_status
ffi_prep_cif_machdep (ffi_cif *cif)
{
  /* All this is for the DARWIN ABI.  */
  unsigned i;
  ffi_type **ptr;
  unsigned bytes;
  unsigned fparg_count = 0, intarg_count = 0;
  unsigned flags = 0;
  unsigned size_al = 0;

  /* All the machine-independent calculation of cif->bytes will be wrong.
     All the calculation of structure sizes will also be wrong.
     Redo the calculation for DARWIN.  */

  if (cif->abi == FFI_DARWIN)
    {
      darwin_adjust_aggregate_sizes (cif->rtype);
      for (i = 0; i < cif->nargs; i++)
	darwin_adjust_aggregate_sizes (cif->arg_types[i]);
    }

  if (cif->abi == FFI_AIX)
    {
      aix_adjust_aggregate_sizes (cif->rtype);
      for (i = 0; i < cif->nargs; i++)
	aix_adjust_aggregate_sizes (cif->arg_types[i]);
    }

  /* Space for the frame pointer, callee's LR, CR, etc, and for
     the asm's temp regs.  */

  bytes = (LINKAGE_AREA_GPRS + ASM_NEEDS_REGISTERS) * sizeof(unsigned long);

  /* Return value handling.  
    The rules m32 are as follows:
     - 32-bit (or less) integer values are returned in gpr3;
     - structures of size <= 4 bytes also returned in gpr3;
     - 64-bit integer values [??? and structures between 5 and 8 bytes] are
       returned in gpr3 and gpr4;
     - Single/double FP values are returned in fpr1;
     - Long double FP (if not equivalent to double) values are returned in
       fpr1 and fpr2;
     m64:
     - 64-bit or smaller integral values are returned in GPR3
     - Single/double FP values are returned in fpr1;
     - Long double FP values are returned in fpr1 and fpr2;
     m64 Structures:
     - If the structure could be accommodated in registers were it to be the
       first argument to a routine, then it is returned in those registers.
     m32/m64 structures otherwise:
     - Larger structures values are allocated space and a pointer is passed
       as the first argument.  */
  switch (cif->rtype->type)
    {

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
    case FFI_TYPE_LONGDOUBLE:
      flags |= FLAG_RETURNS_128BITS;
      flags |= FLAG_RETURNS_FP;
      break;
#endif

    case FFI_TYPE_DOUBLE:
      flags |= FLAG_RETURNS_64BITS;
      /* Fall through.  */
    case FFI_TYPE_FLOAT:
      flags |= FLAG_RETURNS_FP;
      break;

    case FFI_TYPE_UINT64:
    case FFI_TYPE_SINT64:
#ifdef POWERPC64
    case FFI_TYPE_POINTER:
#endif
      flags |= FLAG_RETURNS_64BITS;
      break;

    case FFI_TYPE_STRUCT:
#if defined(POWERPC_DARWIN64)
      {
	/* Can we fit the struct into regs?  */
	if (darwin64_struct_ret_by_value_p (cif->rtype))
	  {
	    unsigned nfpr = 0;
	    flags |= FLAG_RETURNS_STRUCT;
	    if (cif->rtype->size != 16)
	      darwin64_scan_struct_for_floats (cif->rtype, &nfpr) ;
	    else
	      flags |= FLAG_RETURNS_128BITS;
	    /* Will be 0 for 16byte struct.  */
	    if (nfpr)
	      flags |= FLAG_RETURNS_FP;
	  }
	else /* By ref. */
	  {
	    flags |= FLAG_RETVAL_REFERENCE;
	    flags |= FLAG_RETURNS_NOTHING;
	    intarg_count++;
	  }
      }
#elif defined(DARWIN_PPC)
      if (cif->rtype->size <= 4)
	flags |= FLAG_RETURNS_STRUCT;
      else /* else by reference.  */
	{
	  flags |= FLAG_RETVAL_REFERENCE;
	  flags |= FLAG_RETURNS_NOTHING;
	  intarg_count++;
	}
#else /* assume we pass by ref.  */
      flags |= FLAG_RETVAL_REFERENCE;
      flags |= FLAG_RETURNS_NOTHING;
      intarg_count++;
#endif
      break;
    case FFI_TYPE_VOID:
      flags |= FLAG_RETURNS_NOTHING;
      break;

    default:
      /* Returns 32-bit integer, or similar.  Nothing to do here.  */
      break;
    }

  /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the
     first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest
     goes on the stack.  
     ??? Structures are passed as a pointer to a copy of the structure. 
     Stuff on the stack needs to keep proper alignment.  
     For m64 the count is effectively of half-GPRs.  */
  for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
    {
      unsigned align_words;
      switch ((*ptr)->type)
	{
	case FFI_TYPE_FLOAT:
	case FFI_TYPE_DOUBLE:
	  fparg_count++;
#if !defined(POWERPC_DARWIN64)
	  /* If this FP arg is going on the stack, it must be
	     8-byte-aligned.  */
	  if (fparg_count > NUM_FPR_ARG_REGISTERS
	      && (intarg_count & 0x01) != 0)
	    intarg_count++;
#endif
	  break;

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
	case FFI_TYPE_LONGDOUBLE:
	  fparg_count += 2;
	  /* If this FP arg is going on the stack, it must be
	     16-byte-aligned.  */
	  if (fparg_count >= NUM_FPR_ARG_REGISTERS)
#if defined (POWERPC64)
	    intarg_count = ALIGN(intarg_count, 2);
#else
	    intarg_count = ALIGN(intarg_count, 4);
#endif
	  break;
#endif

	case FFI_TYPE_UINT64:
	case FFI_TYPE_SINT64:
#if defined(POWERPC64)
	  intarg_count++;
#else
	  /* 'long long' arguments are passed as two words, but
	     either both words must fit in registers or both go
	     on the stack.  If they go on the stack, they must
	     be 8-byte-aligned.  */
	  if (intarg_count == NUM_GPR_ARG_REGISTERS-1
	      || (intarg_count >= NUM_GPR_ARG_REGISTERS 
	          && (intarg_count & 0x01) != 0))
	    intarg_count++;
	  intarg_count += 2;
#endif
	  break;

	case FFI_TYPE_STRUCT:
	  size_al = (*ptr)->size;
#if defined(POWERPC_DARWIN64)
	  align_words = (*ptr)->alignment >> 3;
	  if (align_words)
	    intarg_count = ALIGN(intarg_count, align_words);
	  /* Base size of the struct.  */
	  intarg_count += (size_al + 7) / 8;
	  /* If 16 bytes then don't worry about floats.  */
	  if (size_al != 16)
	    /* Scan through for floats to be placed in regs.  */
	    darwin64_scan_struct_for_floats (*ptr, &fparg_count) ;
#else
	  align_words = (*ptr)->alignment >> 2;
	  if (align_words)
	    intarg_count = ALIGN(intarg_count, align_words);
	  /* If the first member of the struct is a double, then align
	     the struct to double-word. 
	  if ((*ptr)->elements[0]->type == FFI_TYPE_DOUBLE)
	    size_al = ALIGN((*ptr)->size, 8); */
#  ifdef POWERPC64
	  intarg_count += (size_al + 7) / 8;
#  else
	  intarg_count += (size_al + 3) / 4;
#  endif
#endif
	  break;

	default:
	  /* Everything else is passed as a 4-byte word in a GPR, either
	     the object itself or a pointer to it.  */
	  intarg_count++;
	  break;
	}
    }

  if (fparg_count != 0)
    flags |= FLAG_FP_ARGUMENTS;

#if defined(POWERPC_DARWIN64)
  /* Space to image the FPR registers, if needed - which includes when they might be
     used in a struct return.  */
  if (fparg_count != 0 
      || ((flags & FLAG_RETURNS_STRUCT)
	   && (flags & FLAG_RETURNS_FP)))
    bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);
#else
  /* Space for the FPR registers, if needed.  */
  if (fparg_count != 0)
    bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);
#endif

  /* Stack space.  */
#ifdef POWERPC64
  if ((intarg_count + fparg_count) > NUM_GPR_ARG_REGISTERS)
    bytes += (intarg_count + fparg_count) * sizeof(long);
#else
  if ((intarg_count + 2 * fparg_count) > NUM_GPR_ARG_REGISTERS)
    bytes += (intarg_count + 2 * fparg_count) * sizeof(long);
#endif
  else
    bytes += NUM_GPR_ARG_REGISTERS * sizeof(long);

  /* The stack space allocated needs to be a multiple of 16 bytes.  */
  bytes = ALIGN(bytes, 16) ;

  cif->flags = flags;
  cif->bytes = bytes;

  return FFI_OK;
}

extern void ffi_call_AIX(extended_cif *, long, unsigned, unsigned *,
			 void (*fn)(void), void (*fn2)(void));

extern void ffi_call_DARWIN(extended_cif *, long, unsigned, unsigned *,
			    void (*fn)(void), void (*fn2)(void), ffi_type*);

void
ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
{
  extended_cif ecif;

  ecif.cif = cif;
  ecif.avalue = avalue;

  /* If the return value is a struct and we don't have a return
     value address then we need to make one.  */

  if ((rvalue == NULL) &&
      (cif->rtype->type == FFI_TYPE_STRUCT))
    {
      ecif.rvalue = alloca (cif->rtype->size);
    }
  else
    ecif.rvalue = rvalue;

  switch (cif->abi)
    {
    case FFI_AIX:
      ffi_call_AIX(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn,
		   FFI_FN(ffi_prep_args));
      break;
    case FFI_DARWIN:
      ffi_call_DARWIN(&ecif, -(long)cif->bytes, cif->flags, ecif.rvalue, fn,
		      FFI_FN(ffi_prep_args), cif->rtype);
      break;
    default:
      FFI_ASSERT(0);
      break;
    }
}

static void flush_icache(char *);
static void flush_range(char *, int);

/* The layout of a function descriptor.  A C function pointer really
   points to one of these.  */

typedef struct aix_fd_struct {
  void *code_pointer;
  void *toc;
} aix_fd;

/* here I'd like to add the stack frame layout we use in darwin_closure.S
   and aix_closure.S

   m32/m64

   The stack layout looks like this:

   |   Additional params...			| |     Higher address
   ~						~ ~
   |   Parameters      (at least 8*4/8=32/64)	| | NUM_GPR_ARG_REGISTERS
   |--------------------------------------------| |
   |   TOC=R2 (AIX) Reserved (Darwin)   4/8	| |
   |--------------------------------------------| |
   |   Reserved                       2*4/8	| |
   |--------------------------------------------| |
   |   Space for callee's LR		4/8	| |
   |--------------------------------------------| |
   |   Saved CR [low word for m64]      4/8	| |
   |--------------------------------------------| |
   |   Current backchain pointer	4/8	|-/ Parent's frame.
   |--------------------------------------------| <+ <<< on entry to ffi_closure_ASM
   |   Result Bytes			16	| |
   |--------------------------------------------| |
   ~   padding to 16-byte alignment		~ ~
   |--------------------------------------------| |
   |   NUM_FPR_ARG_REGISTERS slots		| |
   |   here fp13 .. fp1		       13*8	| |
   |--------------------------------------------| |
   |   R3..R10			  8*4/8=32/64	| | NUM_GPR_ARG_REGISTERS
   |--------------------------------------------| |
   |   TOC=R2 (AIX) Reserved (Darwin)   4/8	| |
   |--------------------------------------------| |	stack	|
   |   Reserved [compiler,binder]     2*4/8	| |	grows	|
   |--------------------------------------------| |	down	V
   |   Space for callee's LR		4/8	| |
   |--------------------------------------------| |	lower addresses
   |   Saved CR [low word for m64]      4/8	| |
   |--------------------------------------------| |     stack pointer here
   |   Current backchain pointer	4/8	|-/	during
   |--------------------------------------------|   <<<	ffi_closure_ASM.

*/

ffi_status
ffi_prep_closure_loc (ffi_closure* closure,
		      ffi_cif* cif,
		      void (*fun)(ffi_cif*, void*, void**, void*),
		      void *user_data,
		      void *codeloc)
{
  unsigned int *tramp;
  struct ffi_aix_trampoline_struct *tramp_aix;
  aix_fd *fd;

  switch (cif->abi)
    {
      case FFI_DARWIN:

	FFI_ASSERT (cif->abi == FFI_DARWIN);

	tramp = (unsigned int *) &closure->tramp[0];
#if defined(POWERPC_DARWIN64)
	tramp[0] = 0x7c0802a6;  /*   mflr    r0  */
	tramp[1] = 0x429f0015;  /*   bcl-    20,4*cr7+so,  +0x18 (L1)  */
	/* We put the addresses here.  */
	tramp[6] = 0x7d6802a6;  /*L1:   mflr    r11  */
	tramp[7] = 0xe98b0000;  /*   ld     r12,0(r11) function address  */
	tramp[8] = 0x7c0803a6;  /*   mtlr    r0   */
	tramp[9] = 0x7d8903a6;  /*   mtctr   r12  */
	tramp[10] = 0xe96b0008;  /*   lwz     r11,8(r11) static chain  */
	tramp[11] = 0x4e800420;  /*   bctr  */

	*((unsigned long *)&tramp[2]) = (unsigned long) ffi_closure_ASM; /* function  */
	*((unsigned long *)&tramp[4]) = (unsigned long) codeloc; /* context  */
#else
	tramp[0] = 0x7c0802a6;  /*   mflr    r0  */
	tramp[1] = 0x429f000d;  /*   bcl-    20,4*cr7+so,0x10  */
	tramp[4] = 0x7d6802a6;  /*   mflr    r11  */
	tramp[5] = 0x818b0000;  /*   lwz     r12,0(r11) function address  */
	tramp[6] = 0x7c0803a6;  /*   mtlr    r0   */
	tramp[7] = 0x7d8903a6;  /*   mtctr   r12  */
	tramp[8] = 0x816b0004;  /*   lwz     r11,4(r11) static chain  */
	tramp[9] = 0x4e800420;  /*   bctr  */
	tramp[2] = (unsigned long) ffi_closure_ASM; /* function  */
	tramp[3] = (unsigned long) codeloc; /* context  */
#endif
	closure->cif = cif;
	closure->fun = fun;
	closure->user_data = user_data;

	/* Flush the icache. Only necessary on Darwin.  */
	flush_range(codeloc, FFI_TRAMPOLINE_SIZE);

	break;

    case FFI_AIX:

      tramp_aix = (struct ffi_aix_trampoline_struct *) (closure->tramp);
      fd = (aix_fd *)(void *)ffi_closure_ASM;

      FFI_ASSERT (cif->abi == FFI_AIX);

      tramp_aix->code_pointer = fd->code_pointer;
      tramp_aix->toc = fd->toc;
      tramp_aix->static_chain = codeloc;
      closure->cif = cif;
      closure->fun = fun;
      closure->user_data = user_data;

    default:

      FFI_ASSERT(0);
      break;
    }
  return FFI_OK;
}

static void
flush_icache(char *addr)
{
#ifndef _AIX
  __asm__ volatile (
		"dcbf 0,%0\n"
		"\tsync\n"
		"\ticbi 0,%0\n"
		"\tsync\n"
		"\tisync"
		: : "r"(addr) : "memory");
#endif
}

static void
flush_range(char * addr1, int size)
{
#define MIN_LINE_SIZE 32
  int i;
  for (i = 0; i < size; i += MIN_LINE_SIZE)
    flush_icache(addr1+i);
  flush_icache(addr1+size-1);
}

typedef union
{
  float f;
  double d;
} ffi_dblfl;

ffi_type *
ffi_closure_helper_DARWIN (ffi_closure *, void *,
			   unsigned long *, ffi_dblfl *);

/* Basically the trampoline invokes ffi_closure_ASM, and on
   entry, r11 holds the address of the closure.
   After storing the registers that could possibly contain
   parameters to be passed into the stack frame and setting
   up space for a return value, ffi_closure_ASM invokes the
   following helper function to do most of the work.  */

ffi_type *
ffi_closure_helper_DARWIN (ffi_closure *closure, void *rvalue,
			   unsigned long *pgr, ffi_dblfl *pfr)
{
  /* rvalue is the pointer to space for return value in closure assembly
     pgr is the pointer to where r3-r10 are stored in ffi_closure_ASM
     pfr is the pointer to where f1-f13 are stored in ffi_closure_ASM.  */

  typedef double ldbits[2];

  union ldu
  {
    ldbits lb;
    long double ld;
  };

  void **          avalue;
  ffi_type **      arg_types;
  long             i, avn;
  ffi_cif *        cif;
  ffi_dblfl *      end_pfr = pfr + NUM_FPR_ARG_REGISTERS;
  unsigned         size_al;
#if defined(POWERPC_DARWIN64)
  unsigned 	   fpsused = 0;
#endif

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

  if (cif->rtype->type == FFI_TYPE_STRUCT)
    {
#if defined(POWERPC_DARWIN64)
      if (!darwin64_struct_ret_by_value_p (cif->rtype))
	{
    	  /* Won't fit into the regs - return by ref.  */
	  rvalue = (void *) *pgr;
	  pgr++;
	}
#elif defined(DARWIN_PPC)
      if (cif->rtype->size > 4)
	{
	  rvalue = (void *) *pgr;
	  pgr++;
	}
#else /* assume we return by ref.  */
      rvalue = (void *) *pgr;
      pgr++;
#endif
    }

  i = 0;
  avn = cif->nargs;
  arg_types = cif->arg_types;

  /* Grab the addresses of the arguments from the stack frame.  */
  while (i < avn)
    {
      switch (arg_types[i]->type)
	{
	case FFI_TYPE_SINT8:
	case FFI_TYPE_UINT8:
#if  defined(POWERPC64)
	  avalue[i] = (char *) pgr + 7;
#else
	  avalue[i] = (char *) pgr + 3;
#endif
	  pgr++;
	  break;

	case FFI_TYPE_SINT16:
	case FFI_TYPE_UINT16:
#if  defined(POWERPC64)
	  avalue[i] = (char *) pgr + 6;
#else
	  avalue[i] = (char *) pgr + 2;
#endif
	  pgr++;
	  break;

	case FFI_TYPE_SINT32:
	case FFI_TYPE_UINT32:
#if  defined(POWERPC64)
	  avalue[i] = (char *) pgr + 4;
#else
	case FFI_TYPE_POINTER:
	  avalue[i] = pgr;
#endif
	  pgr++;
	  break;

	case FFI_TYPE_STRUCT:
	  size_al = arg_types[i]->size;
#if defined(POWERPC_DARWIN64)
	  pgr = (unsigned long *)ALIGN((char *)pgr, arg_types[i]->alignment);
	  if (size_al < 3 || size_al == 4)
	    {
	      avalue[i] = ((char *)pgr)+8-size_al;
	      if (arg_types[i]->elements[0]->type == FFI_TYPE_FLOAT
		  && fpsused < NUM_FPR_ARG_REGISTERS)
		{
		  *(float *)pgr = (float) *(double *)pfr;
		  pfr++;
		  fpsused++;
		}
	    }
	  else 
	    {
	      if (size_al != 16)
		pfr = (ffi_dblfl *) 
		    darwin64_struct_floats_to_mem (arg_types[i], (char *)pgr,
						   (double *)pfr, &fpsused);
	      avalue[i] = pgr;
	    }
	  pgr += (size_al + 7) / 8;
#else
	  /* If the first member of the struct is a double, then align
	     the struct to double-word.  */
	  if (arg_types[i]->elements[0]->type == FFI_TYPE_DOUBLE)
	    size_al = ALIGN(arg_types[i]->size, 8);
#  if defined(POWERPC64)
	  FFI_ASSERT (cif->abi != FFI_DARWIN)
	  avalue[i] = pgr;
	  pgr += (size_al + 7) / 8;
#  else
	  /* Structures that match the basic modes (QI 1 byte, HI 2 bytes,
	     SI 4 bytes) are aligned as if they were those modes.  */
	  if (size_al < 3 && cif->abi == FFI_DARWIN)
	    avalue[i] = (char*) pgr + 4 - size_al;
	  else
	    avalue[i] = pgr;
	  pgr += (size_al + 3) / 4;
#  endif
#endif
	  break;

	case FFI_TYPE_SINT64:
	case FFI_TYPE_UINT64:
#if  defined(POWERPC64)
	case FFI_TYPE_POINTER:
	  avalue[i] = pgr;
	  pgr++;
	  break;
#else
	  /* Long long ints are passed in two gpr's.  */
	  avalue[i] = pgr;
	  pgr += 2;
	  break;
#endif

	case FFI_TYPE_FLOAT:
	  /* A float value consumes a GPR.
	     There are 13 64bit floating point registers.  */
	  if (pfr < end_pfr)
	    {
	      double temp = pfr->d;
	      pfr->f = (float) temp;
	      avalue[i] = pfr;
	      pfr++;
	    }
	  else
	    {
	      avalue[i] = pgr;
	    }
	  pgr++;
	  break;

	case FFI_TYPE_DOUBLE:
	  /* A double value consumes two GPRs.
	     There are 13 64bit floating point registers.  */
	  if (pfr < end_pfr)
	    {
	      avalue[i] = pfr;
	      pfr++;
	    }
	  else
	    {
	      avalue[i] = pgr;
	    }
#ifdef POWERPC64
	  pgr++;
#else
	  pgr += 2;
#endif
	  break;

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE

	case FFI_TYPE_LONGDOUBLE:
#ifdef POWERPC64
	  if (pfr + 1 < end_pfr)
	    {
	      avalue[i] = pfr;
	      pfr += 2;
	    }
	  else
	    {
	      if (pfr < end_pfr)
		{
		  *pgr = *(unsigned long *) pfr;
		  pfr++;
		}
	      avalue[i] = pgr;
	    }
	  pgr += 2;
#else  /* POWERPC64 */
	  /* A long double value consumes four GPRs and two FPRs.
	     There are 13 64bit floating point registers.  */
	  if (pfr + 1 < end_pfr)
	    {
	      avalue[i] = pfr;
	      pfr += 2;
	    }
	  /* Here we have the situation where one part of the long double
	     is stored in fpr13 and the other part is already on the stack.
	     We use a union to pass the long double to avalue[i].  */
	  else if (pfr + 1 == end_pfr)
	    {
	      union ldu temp_ld;
	      memcpy (&temp_ld.lb[0], pfr, sizeof(ldbits));
	      memcpy (&temp_ld.lb[1], pgr + 2, sizeof(ldbits));
	      avalue[i] = &temp_ld.ld;
	      pfr++;
	    }
	  else
	    {
	      avalue[i] = pgr;
	    }
	  pgr += 4;
#endif  /* POWERPC64 */
	  break;
#endif
	default:
	  FFI_ASSERT(0);
	}
      i++;
    }

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

  /* Tell ffi_closure_ASM to perform return type promotions.  */
  return cif->rtype;
}