summaryrefslogtreecommitdiff
path: root/libffi/src/powerpc/ffi.c
blob: 29f7dba382788364e876958ad2fa478a7a55fc4a (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
/* -----------------------------------------------------------------------
   ffi.c - Copyright (c) 1998 Geoffrey Keating
   
   PowerPC Foreign Function Interface 

   $Id: ffi.c,v 1.1.1.1 1998/11/29 16:48:16 green Exp $

   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>
#include <stdio.h>

#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 1)
# define hidden __attribute__ ((visibility ("hidden")))
#else
# define hidden
#endif


extern void ffi_closure_SYSV(void);
extern void hidden ffi_closure_LINUX64(void);

enum {
  /* The assembly depends on these exact flags.  */
  FLAG_RETURNS_NOTHING  = 1 << (31-30), /* These go in cr7 */
  FLAG_RETURNS_FP       = 1 << (31-29),
  FLAG_RETURNS_64BITS   = 1 << (31-28),

  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 SYSV ABI.  */
enum {
  NUM_GPR_ARG_REGISTERS = 8,
  NUM_FPR_ARG_REGISTERS = 8
};
enum { ASM_NEEDS_REGISTERS = 4 };

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

   The stack layout we want looks like this:

   |   Return address from ffi_call_SYSV 4bytes	|	higher addresses
   |--------------------------------------------|
   |   Previous backchain pointer	4	| 	stack pointer here
   |--------------------------------------------|<+ <<<	on entry to
   |   Saved r28-r31			4*4	| |	ffi_call_SYSV
   |--------------------------------------------| |
   |   GPR registers r3-r10		8*4	| |	ffi_call_SYSV
   |--------------------------------------------| |
   |   FPR registers f1-f8 (optional)	8*8	| |
   |--------------------------------------------| |	stack	|
   |   Space for copied structures		| |	grows	|
   |--------------------------------------------| |	down    V
   |   Parameters that didn't fit in registers  | |
   |--------------------------------------------| |	lower addresses
   |   Space for callee's LR		4	| |
   |--------------------------------------------| |	stack pointer here
   |   Current backchain pointer	4	|-/	during
   |--------------------------------------------|   <<<	ffi_call_SYSV

   */

/*@-exportheader@*/
void ffi_prep_args_SYSV(extended_cif *ecif, unsigned *const stack)
/*@=exportheader@*/
{
  const unsigned bytes = ecif->cif->bytes;
  const unsigned flags = ecif->cif->flags;
  
  /* 'stacktop' points at the previous backchain pointer.  */
  unsigned *const stacktop = stack + (bytes / sizeof(unsigned));

  /* 'gpr_base' points at the space for gpr3, and grows upwards as
     we use GPR registers.  */
  unsigned *gpr_base = stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS;
  int intarg_count = 0;

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

  /* 'copy_space' grows down as we put structures in it.  It should
     stay 16-byte aligned.  */
  char *copy_space = ((flags & FLAG_FP_ARGUMENTS)
		      ? (char *)fpr_base
		      : (char *)gpr_base);

  /* 'next_arg' grows up as we put parameters in it.  */
  unsigned *next_arg = stack + 2;

  int i;
  ffi_type **ptr;
  double double_tmp;
  void **p_argv;
  size_t struct_copy_size;
  unsigned gprvalue;

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

  /* Deal with return values that are actually pass-by-reference.  */
  if (flags & FLAG_RETVAL_REFERENCE)
  {
    *gpr_base++ = (unsigned long)(char *)ecif->rvalue;
    intarg_count++;
  }

  /* Now for the arguments.  */
  p_argv = ecif->avalue;
  for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs;
       i > 0;
       i--, ptr++, p_argv++)
    {
      switch ((*ptr)->type)
	{
	case FFI_TYPE_FLOAT:
	  double_tmp = *(float *)*p_argv;
	  if (fparg_count >= NUM_FPR_ARG_REGISTERS)
	    {
	      *(float *)next_arg = (float)double_tmp;
	      next_arg += 1;
	    }
	  else
	    *fpr_base++ = double_tmp;
	  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)
	    {
	      if (intarg_count%2 != 0)
		{
		  intarg_count++;
		  next_arg++;
		}
	      *(double *)next_arg = double_tmp;
	      next_arg += 2;
	    }
	  else
	    *fpr_base++ = double_tmp;
	  fparg_count++;
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;

	case FFI_TYPE_UINT64:
	case FFI_TYPE_SINT64:
	  if (intarg_count == NUM_GPR_ARG_REGISTERS-1)
	    intarg_count++;
	  if (intarg_count >= NUM_GPR_ARG_REGISTERS)
	    {
	      if (intarg_count%2 != 0)
		{
		  intarg_count++;
		  next_arg++;
		}
	      *(long long *)next_arg = *(long long *)*p_argv;
	      next_arg += 2;
	    }
	  else
	    {
              /* whoops: abi states only certain register pairs
               * can be used for passing long long int
               * specifically (r3,r4), (r5,r6), (r7,r8), 
               * (r9,r10) and if next arg is long long but
               * not correct starting register of pair then skip
               * until the proper starting register
	       */
              if (intarg_count%2 != 0)
                {
                  intarg_count ++;
                  gpr_base++;
                }
	      *(long long *)gpr_base = *(long long *)*p_argv;
	      gpr_base += 2;
	    }
	  intarg_count += 2;
	  break;

	case FFI_TYPE_STRUCT:
#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
	case FFI_TYPE_LONGDOUBLE:
#endif
	  struct_copy_size = ((*ptr)->size + 15) & ~0xF;
	  copy_space -= struct_copy_size;
	  memcpy(copy_space, (char *)*p_argv, (*ptr)->size);
	  
	  gprvalue = (unsigned long)copy_space;

	  FFI_ASSERT(copy_space > (char *)next_arg);
	  FFI_ASSERT(flags & FLAG_ARG_NEEDS_COPY);
	  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_INT:
	case FFI_TYPE_UINT32:
	case FFI_TYPE_SINT32:
	case FFI_TYPE_POINTER:
	  gprvalue = *(unsigned *)*p_argv;
	putgpr:
	  if (intarg_count >= NUM_GPR_ARG_REGISTERS)
	    *next_arg++ = gprvalue;
	  else
	    *gpr_base++ = gprvalue;
	  intarg_count++;
	  break;
	}
    }

  /* Check that we didn't overrun the stack...  */
  FFI_ASSERT(copy_space >= (char *)next_arg);
  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);
}

/* About the LINUX64 ABI.  */
enum {
  NUM_GPR_ARG_REGISTERS64 = 8,
  NUM_FPR_ARG_REGISTERS64 = 13
};
enum { ASM_NEEDS_REGISTERS64 = 4 };

/* ffi_prep_args64 is called by the assembly routine once stack space
   has been allocated for the function's arguments.

   The stack layout we want looks like this:

   |   Ret addr from ffi_call_LINUX64	8bytes	|	higher addresses
   |--------------------------------------------|
   |   CR save area			8bytes	|
   |--------------------------------------------|
   |   Previous backchain pointer	8	| 	stack pointer here
   |--------------------------------------------|<+ <<<	on entry to
   |   Saved r28-r31			4*8	| |	ffi_call_LINUX64
   |--------------------------------------------| |
   |   GPR registers r3-r10		8*8	| |
   |--------------------------------------------| |
   |   FPR registers f1-f13 (optional)	13*8	| |
   |--------------------------------------------| |
   |   Parameter save area		        | |
   |--------------------------------------------| |
   |   TOC save area			8	| |
   |--------------------------------------------| |	stack	|
   |   Linker doubleword		8	| |	grows	|
   |--------------------------------------------| |	down	V
   |   Compiler doubleword		8	| |
   |--------------------------------------------| |	lower addresses
   |   Space for callee's LR		8	| |
   |--------------------------------------------| |
   |   CR save area			8	| |
   |--------------------------------------------| |	stack pointer here
   |   Current backchain pointer	8	|-/	during
   |--------------------------------------------|   <<<	ffi_call_LINUX64

   */

/*@-exportheader@*/
void hidden ffi_prep_args64(extended_cif *ecif, unsigned long *const stack)
/*@=exportheader@*/
{
  const unsigned long bytes = ecif->cif->bytes;
  const unsigned long flags = ecif->cif->flags;

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

  /* 'next_arg' points at the space for gpr3, and grows upwards as
     we use GPR registers, then continues at rest.  */
  unsigned long *const gpr_base = stacktop - ASM_NEEDS_REGISTERS64
				  - NUM_GPR_ARG_REGISTERS64;
  unsigned long *const gpr_end = gpr_base + NUM_GPR_ARG_REGISTERS64;
  unsigned long *const rest = stack + 6 + NUM_GPR_ARG_REGISTERS64;
  unsigned long *next_arg = gpr_base;

  /* 'fpr_base' points at the space for fpr3, and grows upwards as
     we use FPR registers.  */
  double *fpr_base = (double *)gpr_base - NUM_FPR_ARG_REGISTERS64;
  int fparg_count = 0;

  int i, words;
  ffi_type **ptr;
  double double_tmp;
  void **p_argv;
  unsigned long gprvalue;

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

  /* Deal with return values that are actually pass-by-reference.  */
  if (flags & FLAG_RETVAL_REFERENCE)
    *next_arg++ = (unsigned long)(char *)ecif->rvalue;

  /* Now for the arguments.  */
  p_argv = ecif->avalue;
  for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs;
       i > 0;
       i--, ptr++, p_argv++)
    {
      switch ((*ptr)->type)
	{
	case FFI_TYPE_FLOAT:
	  double_tmp = *(float *)*p_argv;
	  *(float *)next_arg = (float)double_tmp;
	  if (++next_arg == gpr_end)
	    next_arg = rest;
	  if (fparg_count < NUM_FPR_ARG_REGISTERS64)
	    *fpr_base++ = double_tmp;
	  fparg_count++;
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;

	case FFI_TYPE_DOUBLE:
	  double_tmp = *(double *)*p_argv;
	  *(double *)next_arg = double_tmp;
	  if (++next_arg == gpr_end)
	    next_arg = rest;
	  if (fparg_count < NUM_FPR_ARG_REGISTERS64)
	    *fpr_base++ = double_tmp;
	  fparg_count++;
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
	case FFI_TYPE_LONGDOUBLE:
	  double_tmp = ((double *) *p_argv)[0];
	  *(double *) next_arg = double_tmp;
	  if (++next_arg == gpr_end)
	    next_arg = rest;
	  if (fparg_count < NUM_FPR_ARG_REGISTERS64)
	    *fpr_base++ = double_tmp;
	  fparg_count++;
	  double_tmp = ((double *) *p_argv)[1];
	  *(double *) next_arg = double_tmp;
	  if (++next_arg == gpr_end)
	    next_arg = rest;
	  if (fparg_count < NUM_FPR_ARG_REGISTERS64)
	    *fpr_base++ = double_tmp;
	  fparg_count++;
	  FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
	  break;
#endif

	case FFI_TYPE_STRUCT:
	  words = ((*ptr)->size + 7) / 8;
	  if (next_arg >= gpr_base && next_arg + words > gpr_end)
	    {
	      size_t first = (char *) gpr_end - (char *) next_arg;
	      memcpy((char *) next_arg, (char *) *p_argv, first);
	      memcpy((char *) rest, (char *) *p_argv + first,
		     (*ptr)->size - first);
	      next_arg = (unsigned long *) ((char *) rest + words * 8 - first);
	    }
	  else
	    {
	      char *where = (char *) next_arg;

	      /* Structures with size less than eight bytes are passed
		 left-padded.  */
	      if ((*ptr)->size < 8)
		where += 8 - (*ptr)->size;

	      memcpy (where, (char *) *p_argv, (*ptr)->size);
	      next_arg += words;
	      if (next_arg == gpr_end)
		next_arg = rest;
	    }
	  break;

	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_UINT32:
	  gprvalue = *(unsigned int *)*p_argv;
	  goto putgpr;
	case FFI_TYPE_INT:
	case FFI_TYPE_SINT32:
	  gprvalue = *(signed int *)*p_argv;
	  goto putgpr;
	
	case FFI_TYPE_UINT64:
	case FFI_TYPE_SINT64:
	case FFI_TYPE_POINTER:
	  gprvalue = *(unsigned long *)*p_argv;
	putgpr:
	  *next_arg++ = gprvalue;
	  if (next_arg == gpr_end)
	    next_arg = rest;
	  break;
	}
    }

  FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS
	     || (next_arg >= gpr_base && next_arg <= gpr_base + 4));
}



/* Perform machine dependent cif processing */
ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
{
  /* All this is for the SYSV and LINUX64 ABI.  */
  int i;
  ffi_type **ptr;
  unsigned bytes;
  int fparg_count = 0, intarg_count = 0;
  unsigned flags = 0;
  unsigned struct_copy_size = 0;
  unsigned type = cif->rtype->type;

  if (cif->abi != FFI_LINUX64)
    {    
      /* All the machine-independent calculation of cif->bytes will be wrong.
	 Redo the calculation for SYSV.  */

      /* Space for the frame pointer, callee's LR, and the asm's temp regs.  */
      bytes = (2 + ASM_NEEDS_REGISTERS) * sizeof(int);

      /* Space for the GPR registers.  */
      bytes += NUM_GPR_ARG_REGISTERS * sizeof(int);
    }
  else
    {
      /* 64-bit ABI.  */

      /* Space for backchain, CR, LR, cc/ld doubleword, TOC and the asm's temp
	 regs.  */
      bytes = (6 + ASM_NEEDS_REGISTERS64) * sizeof(long);

      /* Space for the mandatory parm save area and general registers.  */
      bytes += 2 * NUM_GPR_ARG_REGISTERS64 * sizeof(long);

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
      if (type == FFI_TYPE_LONGDOUBLE)
	type = FFI_TYPE_DOUBLE;
#endif
    }

  /* Return value handling.  The rules for SYSV 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;
     - Larger structures and long double (if not equivalent to double) values
       are allocated space and a pointer is passed as the first argument.
     For LINUX64:
     - integer values in gpr3;
     - Structures/Unions by reference;
     - Single/double FP values in fpr1, long double in fpr1,fpr2.  */
  switch (type)
    {
    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:
      flags |= FLAG_RETURNS_64BITS;
      break;

    case FFI_TYPE_STRUCT:
      if (cif->abi != FFI_GCC_SYSV && cif->abi != FFI_LINUX64)
	{
	  if (cif->rtype->size <= 4)
	    break;
	  else if (cif->rtype->size <= 8)
	    {
	      flags |= FLAG_RETURNS_64BITS;
	      break;
	    }
	}
      /* else fall through.  */
#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
    case FFI_TYPE_LONGDOUBLE:
#endif
      intarg_count++;
      flags |= FLAG_RETVAL_REFERENCE;
      /* Fall through.  */
    case FFI_TYPE_VOID:
      flags |= FLAG_RETURNS_NOTHING;
      break;

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

  if (cif->abi != FFI_LINUX64)
    /* 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 and long doubles (if not equivalent
       to double) are passed as a pointer to a copy of the structure.
       Stuff on the stack needs to keep proper alignment.  */
    for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
      {
	switch ((*ptr)->type)
	  {
	  case FFI_TYPE_FLOAT:
	    fparg_count++;
	    /* floating singles are not 8-aligned on stack */
	    break;

	  case FFI_TYPE_DOUBLE:
	    fparg_count++;
	    /* If this FP arg is going on the stack, it must be
	       8-byte-aligned.  */
	    if (fparg_count > NUM_FPR_ARG_REGISTERS
		&& intarg_count%2 != 0)
	      intarg_count++;
	    break;

	  case FFI_TYPE_UINT64:
	  case FFI_TYPE_SINT64:
	    /* '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%2 != 0))
	      intarg_count++;
	    intarg_count += 2;
	    break;

	  case FFI_TYPE_STRUCT:
#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
	  case FFI_TYPE_LONGDOUBLE:
#endif
	    /* We must allocate space for a copy of these to enforce
	       pass-by-value.  Pad the space up to a multiple of 16
	       bytes (the maximum alignment required for anything under
	       the SYSV ABI).  */
	    struct_copy_size += ((*ptr)->size + 15) & ~0xF;
	    /* Fall through (allocate space for the pointer).  */

	  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;
	  }
      }
  else
    for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
      {
	switch ((*ptr)->type)
	  {
#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
	  case FFI_TYPE_LONGDOUBLE:
	    fparg_count += 2;
	    intarg_count += 2;
	    break;
#endif
	  case FFI_TYPE_FLOAT:
	  case FFI_TYPE_DOUBLE:
	    fparg_count++;
	    intarg_count++;
	    break;

	  case FFI_TYPE_STRUCT:
	    intarg_count += ((*ptr)->size + 7) / 8;
	    break;

	  default:
	    /* Everything else is passed as a 8-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 (intarg_count > 4)
    flags |= FLAG_4_GPR_ARGUMENTS;
  if (struct_copy_size != 0)
    flags |= FLAG_ARG_NEEDS_COPY;

  if (cif->abi != FFI_LINUX64)
    {
      /* Space for the FPR registers, if needed.  */
      if (fparg_count != 0)
	bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);

      /* Stack space.  */
      if (intarg_count > NUM_GPR_ARG_REGISTERS)
	bytes += (intarg_count - NUM_GPR_ARG_REGISTERS) * sizeof(int);
      if (fparg_count > NUM_FPR_ARG_REGISTERS)
	bytes += (fparg_count - NUM_FPR_ARG_REGISTERS) * sizeof(double);
    }
  else
    {
      /* Space for the FPR registers, if needed.  */
      if (fparg_count != 0)
	bytes += NUM_FPR_ARG_REGISTERS64 * sizeof(double);

      /* Stack space.  */
      if (intarg_count > NUM_GPR_ARG_REGISTERS64)
	bytes += (intarg_count - NUM_GPR_ARG_REGISTERS64) * sizeof(long);
    }

  /* The stack space allocated needs to be a multiple of 16 bytes.  */
  bytes = (bytes + 15) & ~0xF;

  /* Add in the space for the copied structures.  */
  bytes += struct_copy_size;

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

  return FFI_OK;
}

/*@-declundef@*/
/*@-exportheader@*/
extern void ffi_call_SYSV(/*@out@*/ extended_cif *, 
			  unsigned, unsigned, 
			  /*@out@*/ unsigned *, 
			  void (*fn)());
extern void hidden ffi_call_LINUX64(/*@out@*/ extended_cif *, 
				    unsigned long, unsigned long,
				    /*@out@*/ unsigned long *, 
				    void (*fn)());
/*@=declundef@*/
/*@=exportheader@*/

void ffi_call(/*@dependent@*/ ffi_cif *cif, 
	      void (*fn)(), 
	      /*@out@*/ void *rvalue, 
	      /*@dependent@*/ 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))
    {
      /*@-sysunrecog@*/
      ecif.rvalue = alloca(cif->rtype->size);
      /*@=sysunrecog@*/
    }
  else
    ecif.rvalue = rvalue;
    
  
  switch (cif->abi) 
    {
#ifndef POWERPC64
    case FFI_SYSV:
    case FFI_GCC_SYSV:
      /*@-usedef@*/
      ffi_call_SYSV(&ecif, -cif->bytes, 
		    cif->flags, ecif.rvalue, fn);
      /*@=usedef@*/
      break;
#else
    case FFI_LINUX64:
      /*@-usedef@*/
      ffi_call_LINUX64(&ecif, -(long) cif->bytes,
		       cif->flags, ecif.rvalue, fn);
      /*@=usedef@*/
      break;
#endif
    default:
      FFI_ASSERT(0);
      break;
    }
}


#ifndef POWERPC64
static void flush_icache(char *, int);

#define MIN_CACHE_LINE_SIZE 8

static void flush_icache(char * addr1, int size)
{
  int i;
  char * addr;
  for (i = 0; i < size; i += MIN_CACHE_LINE_SIZE) {
     addr = addr1 + i;
     __asm__ volatile ("icbi 0,%0;" "dcbf 0,%0;" : : "r"(addr) : "memory");
  }
  addr = addr1 + size - 1;
  __asm__ volatile ("icbi 0,%0;" "dcbf 0,%0;" "sync;" "isync;" : : "r"(addr) : "memory");
}
#endif

ffi_status
ffi_prep_closure (ffi_closure* closure,
		  ffi_cif* cif,
		  void (*fun)(ffi_cif*, void*, void**, void*),
		  void *user_data)
{
#ifdef POWERPC64
  void **tramp = (void **) &closure->tramp[0];

  FFI_ASSERT (cif->abi == FFI_LINUX64);
  /* Copy function address and TOC from ffi_closure_LINUX64.  */
  memcpy (tramp, (char *) ffi_closure_LINUX64, 16);
  tramp[2] = (void *) closure;
#else
  unsigned int *tramp;

  FFI_ASSERT (cif->abi == FFI_GCC_SYSV);

  tramp = (unsigned int *) &closure->tramp[0];
  tramp[0] = 0x7c0802a6;  /*   mflr    r0 */
  tramp[1] = 0x4800000d;  /*   bl      10 <trampoline_initial+0x10> */
  tramp[4] = 0x7d6802a6;  /*   mflr    r11 */
  tramp[5] = 0x7c0803a6;  /*   mtlr    r0 */
  tramp[6] = 0x800b0000;  /*   lwz     r0,0(r11) */
  tramp[7] = 0x816b0004;  /*   lwz     r11,4(r11) */
  tramp[8] = 0x7c0903a6;  /*   mtctr   r0 */
  tramp[9] = 0x4e800420;  /*   bctr */
  *(void **) &tramp[2] = (void *)ffi_closure_SYSV; /* function */
  *(void **) &tramp[3] = (void *)closure;          /* context */

  /* Flush the icache.  */
  flush_icache(&closure->tramp[0],FFI_TRAMPOLINE_SIZE);
#endif

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

  return FFI_OK;
}

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

int ffi_closure_helper_SYSV (ffi_closure*, void*, unsigned long*, 
			     ffi_dblfl*, unsigned long*);

/* Basically the trampoline invokes ffi_closure_SYSV, 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_SYSV invokes the 
 * following helper function to do most of the work
 */

int
ffi_closure_helper_SYSV (ffi_closure* closure, void * rvalue, 
            unsigned long * pgr, ffi_dblfl * pfr, 
            unsigned long * pst)
{
  /* 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_SYSV */
  /* pfr is the pointer to where f1-f8 are stored in ffi_closure_SYSV  */
  /* pst is the pointer to outgoing parameter stack in original caller */

  void **          avalue;
  ffi_type **      arg_types;
  long             i, avn;
  long             nf;   /* number of floating registers already used */
  long             ng;   /* number of general registers already used */
  ffi_cif *        cif; 
  double           temp; 

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

  nf = 0;
  ng = 0;

  /* Copy the caller's structure return value address so that the closure
     returns the data directly to the caller.  */
  if (cif->rtype->type == FFI_TYPE_STRUCT)
    {
      rvalue = (void *) *pgr;
      ng++;
      pgr++;
    }

  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:
	/* there are 8 gpr registers used to pass values */
          if (ng < 8) {
	     avalue[i] = (((char *)pgr)+3);
             ng++;
             pgr++;
          } else {
             avalue[i] = (((char *)pst)+3);
             pst++;
          }
	  break;
           
	case FFI_TYPE_SINT16:
	case FFI_TYPE_UINT16:
	/* there are 8 gpr registers used to pass values */
          if (ng < 8) {
	     avalue[i] = (((char *)pgr)+2);
             ng++;
             pgr++;
          } else {
             avalue[i] = (((char *)pst)+2);
             pst++;
          }
	  break;

	case FFI_TYPE_SINT32:
	case FFI_TYPE_UINT32:
	case FFI_TYPE_POINTER:
	  /* there are 8 gpr registers used to pass values */
          if (ng < 8) {
	     avalue[i] = pgr;
             ng++;
             pgr++;
          } else {
             avalue[i] = pst;
             pst++;
          }
	  break;

	case FFI_TYPE_STRUCT:
	  /* Structs are passed by reference. The address will appear in a 
	     gpr if it is one of the first 8 arguments.  */
          if (ng < 8) {
	     avalue[i] = (void *) *pgr;
             ng++;
             pgr++;
          } else {
             avalue[i] = (void *) *pst;
             pst++;
          }
	  break;

	case FFI_TYPE_SINT64:
	case FFI_TYPE_UINT64:
	  /* passing long long ints are complex, they must
           * be passed in suitable register pairs such as
           * (r3,r4) or (r5,r6) or (r6,r7), or (r7,r8) or (r9,r10)
           * and if the entire pair aren't available then the outgoing
           * parameter stack is used for both but an alignment of 8
           * must will be kept.  So we must either look in pgr
           * or pst to find the correct address for this type
           * of parameter.
           */
           if (ng < 7) {
              if (ng & 0x01) {
		/* skip r4, r6, r8 as starting points */
                  ng++;
                  pgr++;
              }
              avalue[i] = pgr;
              ng+=2;
              pgr+=2;
           } else {
              if (((long)pst) & 4) pst++;
              avalue[i] = pst;
              pst+=2;
           }
           break;

	case FFI_TYPE_FLOAT:
	    /* unfortunately float values are stored as doubles
             * in the ffi_closure_SYSV code (since we don't check
             * the type in that routine).
             */

          /* there are 8 64bit floating point registers */

          if (nf < 8) {
             temp = pfr->d;
             pfr->f = (float)temp;
             avalue[i] = pfr;
             nf++;
             pfr++;
          } else {
	    /* FIXME? here we are really changing the values
             * stored in the original calling routines outgoing
             * parameter stack.  This is probably a really
             * naughty thing to do but...
             */
	     avalue[i] = pst;
             nf++;
             pst+=1;
          }
	  break;

	case FFI_TYPE_DOUBLE:
	  /* On the outgoing stack all values are aligned to 8 */
          /* there are 8 64bit floating point registers */

          if (nf < 8) {
	     avalue[i] = pfr;
             nf++;
             pfr++;
          } else {
	     if (((long)pst) & 4) pst++;
	     avalue[i] = pst;
             nf++;
             pst+=2;
          }
	  break;

	default:
	  FFI_ASSERT(0);
	}

      i++;
    }


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

  /* Tell ffi_closure_SYSV how to perform return type promotions.  */
  return cif->rtype->type;

}

int hidden ffi_closure_helper_LINUX64 (ffi_closure*, void*, unsigned long*,
				       ffi_dblfl*);

int hidden
ffi_closure_helper_LINUX64 (ffi_closure *closure, void *rvalue, 
			    unsigned long *pst, ffi_dblfl *pfr)
{
  /* rvalue is the pointer to space for return value in closure assembly */
  /* pst is the pointer to parameter save area
     (r3-r10 are stored into its first 8 slots by ffi_closure_LINUX64) */
  /* pfr is the pointer to where f1-f13 are stored in ffi_closure_LINUX64 */

  void **avalue;
  ffi_type **arg_types;
  long i, avn;
  ffi_cif *cif; 
  ffi_dblfl *end_pfr = pfr + NUM_FPR_ARG_REGISTERS64;

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

  /* Copy the caller's structure return value address so that the closure
     returns the data directly to the caller.  */
  if (cif->rtype->type == FFI_TYPE_STRUCT)
    {
      rvalue = (void *) *pst;
      pst++;
    }

  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:
	  avalue[i] = (char *) pst + 7;
	  pst++;
	  break;
           
	case FFI_TYPE_SINT16:
	case FFI_TYPE_UINT16:
	  avalue[i] = (char *) pst + 6;
	  pst++;
	  break;

	case FFI_TYPE_SINT32:
	case FFI_TYPE_UINT32:
	  avalue[i] = (char *) pst + 4;
	  pst++;
	  break;

	case FFI_TYPE_SINT64:
	case FFI_TYPE_UINT64:
	case FFI_TYPE_POINTER:
	  avalue[i] = pst;
	  pst++;
	  break;

	case FFI_TYPE_STRUCT:
	  /* Structures with size less than eight bytes are passed
	     left-padded.  */
	  if (arg_types[i]->size < 8)
	    avalue[i] = (char *) pst + 8 - arg_types[i]->size;
	  else
	    avalue[i] = pst;
	  pst += (arg_types[i]->size + 7) / 8;
	  break;

	case FFI_TYPE_FLOAT:
	  /* unfortunately float values are stored as doubles
           * in the ffi_closure_LINUX64 code (since we don't check
           * the type in that routine).
           */

          /* 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] = pst;
	  pst++;
	  break;

	case FFI_TYPE_DOUBLE:
	  /* On the outgoing stack all values are aligned to 8 */
          /* there are 13 64bit floating point registers */

	  if (pfr < end_pfr)
	    {
	      avalue[i] = pfr;
	      pfr++;
	    }
	  else
	    avalue[i] = pst;
	  pst++;
	  break;

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
	case FFI_TYPE_LONGDOUBLE:
	  if (pfr + 1 < end_pfr)
	    {
	      avalue[i] = pfr;
	      pfr += 2;
	    }
	  else
	    {
	      if (pfr < end_pfr)
		{
		  /* Passed partly in f13 and partly on the stack.
		     Move it all to the stack.  */
		  *pst = *(unsigned long *) pfr;
		  pfr++;
		}
	      avalue[i] = pst;
	    }
	  pst += 2;
	  break;
#endif

	default:
	  FFI_ASSERT(0);
	}

      i++;
    }


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

  /* Tell ffi_closure_LINUX64 how to perform return type promotions.  */
  return cif->rtype->type;
}