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[official-gcc.git] / gomp-20050608-branch / libffi / src / powerpc / ffi_darwin.c
blobd758f8f3af4a613ea0c07c7385cb0b665cce7042
1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (c) 1998 Geoffrey Keating
3
4 PowerPC Foreign Function Interface
5
6 Darwin ABI support (c) 2001 John Hornkvist
7 AIX ABI support (c) 2002 Free Software Foundation, Inc.
8
9 Permission is hereby granted, free of charge, to any person obtaining
10 a copy of this software and associated documentation files (the
11 ``Software''), to deal in the Software without restriction, including
12 without limitation the rights to use, copy, modify, merge, publish,
13 distribute, sublicense, and/or sell copies of the Software, and to
14 permit persons to whom the Software is furnished to do so, subject to
15 the following conditions:
16
17 The above copyright notice and this permission notice shall be included
18 in all copies or substantial portions of the Software.
19
20 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
23 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 OTHER DEALINGS IN THE SOFTWARE.
27 ----------------------------------------------------------------------- */
28
29 #include <ffi.h>
30 #include <ffi_common.h>
31
32 #include <stdlib.h>
33
34 extern void ffi_closure_ASM(void);
35
36 enum {
37 /* The assembly depends on these exact flags. */
38 FLAG_RETURNS_NOTHING = 1 << (31-30), /* These go in cr7 */
39 FLAG_RETURNS_FP = 1 << (31-29),
40 FLAG_RETURNS_64BITS = 1 << (31-28),
41 FLAG_RETURNS_128BITS = 1 << (31-31),
42
43 FLAG_ARG_NEEDS_COPY = 1 << (31- 7),
44 FLAG_FP_ARGUMENTS = 1 << (31- 6), /* cr1.eq; specified by ABI */
45 FLAG_4_GPR_ARGUMENTS = 1 << (31- 5),
46 FLAG_RETVAL_REFERENCE = 1 << (31- 4)
47 };
48
49 /* About the DARWIN ABI. */
50 enum {
51 NUM_GPR_ARG_REGISTERS = 8,
52 NUM_FPR_ARG_REGISTERS = 13
53 };
54 enum { ASM_NEEDS_REGISTERS = 4 };
55
56 /* ffi_prep_args is called by the assembly routine once stack space
57 has been allocated for the function's arguments.
58
59 The stack layout we want looks like this:
60
61 | Return address from ffi_call_DARWIN | higher addresses
62 |--------------------------------------------|
63 | Previous backchain pointer 4 | stack pointer here
64 |--------------------------------------------|<+ <<< on entry to
65 | Saved r28-r31 4*4 | | ffi_call_DARWIN
66 |--------------------------------------------| |
67 | Parameters (at least 8*4=32) | |
68 |--------------------------------------------| |
69 | Space for GPR2 4 | |
70 |--------------------------------------------| | stack |
71 | Reserved 2*4 | | grows |
72 |--------------------------------------------| | down V
73 | Space for callee's LR 4 | |
74 |--------------------------------------------| | lower addresses
75 | Saved CR 4 | |
76 |--------------------------------------------| | stack pointer here
77 | Current backchain pointer 4 |-/ during
78 |--------------------------------------------| <<< ffi_call_DARWIN
79
80 */
81
82 /*@-exportheader@*/
83 void ffi_prep_args(extended_cif *ecif, unsigned *const stack)
84 /*@=exportheader@*/
85 {
86 const unsigned bytes = ecif->cif->bytes;
87 const unsigned flags = ecif->cif->flags;
88
89 /* 'stacktop' points at the previous backchain pointer. */
90 unsigned *const stacktop = stack + (bytes / sizeof(unsigned));
91
92 /* 'fpr_base' points at the space for fpr1, and grows upwards as
93 we use FPR registers. */
94 double *fpr_base = (double*) (stacktop - ASM_NEEDS_REGISTERS) - NUM_FPR_ARG_REGISTERS;
95 int fparg_count = 0;
96
97
98 /* 'next_arg' grows up as we put parameters in it. */
99 unsigned *next_arg = stack + 6; /* 6 reserved positions. */
100
101 int i = ecif->cif->nargs;
102 double double_tmp;
103 void **p_argv = ecif->avalue;
104 unsigned gprvalue;
105 ffi_type** ptr = ecif->cif->arg_types;
106 char *dest_cpy;
107 unsigned size_al = 0;
108
109 /* Check that everything starts aligned properly. */
110 FFI_ASSERT(((unsigned)(char *)stack & 0xF) == 0);
111 FFI_ASSERT(((unsigned)(char *)stacktop & 0xF) == 0);
112 FFI_ASSERT((bytes & 0xF) == 0);
113
114 /* Deal with return values that are actually pass-by-reference.
115 Rule:
116 Return values are referenced by r3, so r4 is the first parameter. */
117
118 if (flags & FLAG_RETVAL_REFERENCE)
119 *next_arg++ = (unsigned)(char *)ecif->rvalue;
120
121 /* Now for the arguments. */
122 for (;
123 i > 0;
124 i--, ptr++, p_argv++)
125 {
126 switch ((*ptr)->type)
127 {
128 /* If a floating-point parameter appears before all of the general-
129 purpose registers are filled, the corresponding GPRs that match
130 the size of the floating-point parameter are skipped. */
131 case FFI_TYPE_FLOAT:
132 double_tmp = *(float *)*p_argv;
133 if (fparg_count >= NUM_FPR_ARG_REGISTERS)
134 *(double *)next_arg = double_tmp;
135 else
136 *fpr_base++ = double_tmp;
137 next_arg++;
138 fparg_count++;
139 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
140 break;
141
142 case FFI_TYPE_DOUBLE:
143 double_tmp = *(double *)*p_argv;
144 if (fparg_count >= NUM_FPR_ARG_REGISTERS)
145 *(double *)next_arg = double_tmp;
146 else
147 *fpr_base++ = double_tmp;
148 next_arg += 2;
149 fparg_count++;
150 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
151 break;
152
153 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
154
155 case FFI_TYPE_LONGDOUBLE:
156 double_tmp = ((double *)*p_argv)[0];
157 if (fparg_count >= NUM_FPR_ARG_REGISTERS)
158 *(double *)next_arg = double_tmp;
159 else
160 *fpr_base++ = double_tmp;
161 next_arg += 2;
162 fparg_count++;
163 double_tmp = ((double *)*p_argv)[1];
164 if (fparg_count >= NUM_FPR_ARG_REGISTERS)
165 *(double *)next_arg = double_tmp;
166 else
167 *fpr_base++ = double_tmp;
168 next_arg += 2;
169 fparg_count++;
170 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
171 break;
172 #endif
173 case FFI_TYPE_UINT64:
174 case FFI_TYPE_SINT64:
175 *(long long *)next_arg = *(long long *)*p_argv;
176 next_arg+=2;
177 break;
178 case FFI_TYPE_UINT8:
179 gprvalue = *(unsigned char *)*p_argv;
180 goto putgpr;
181 case FFI_TYPE_SINT8:
182 gprvalue = *(signed char *)*p_argv;
183 goto putgpr;
184 case FFI_TYPE_UINT16:
185 gprvalue = *(unsigned short *)*p_argv;
186 goto putgpr;
187 case FFI_TYPE_SINT16:
188 gprvalue = *(signed short *)*p_argv;
189 goto putgpr;
190
191 case FFI_TYPE_STRUCT:
192 dest_cpy = (char *) next_arg;
193
194 /* Structures that match the basic modes (QI 1 byte, HI 2 bytes,
195 SI 4 bytes) are aligned as if they were those modes.
196 Structures with 3 byte in size are padded upwards. */
197 size_al = (*ptr)->size;
198 /* If the first member of the struct is a double, then align
199 the struct to double-word.
200 Type 3 is defined in include/ffi.h. #define FFI_TYPE_DOUBLE 3. */
201 if ((*ptr)->elements[0]->type == 3)
202 size_al = ALIGN((*ptr)->size, 8);
203 if (size_al < 3 && ecif->cif->abi == FFI_DARWIN)
204 dest_cpy += 4 - size_al;
205
206 memcpy((char *)dest_cpy, (char *)*p_argv, size_al);
207 next_arg += (size_al + 3) / 4;
208 break;
209
210 case FFI_TYPE_INT:
211 case FFI_TYPE_UINT32:
212 case FFI_TYPE_SINT32:
213 case FFI_TYPE_POINTER:
214 gprvalue = *(unsigned *)*p_argv;
215 putgpr:
216 *next_arg++ = gprvalue;
217 break;
218 default:
219 break;
220 }
221 }
222
223 /* Check that we didn't overrun the stack... */
224 //FFI_ASSERT(gpr_base <= stacktop - ASM_NEEDS_REGISTERS);
225 //FFI_ASSERT((unsigned *)fpr_base
226 // <= stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS);
227 //FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4);
228 }
229
230 /* Perform machine dependent cif processing. */
231 ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
232 {
233 /* All this is for the DARWIN ABI. */
234 int i;
235 ffi_type **ptr;
236 unsigned bytes;
237 int fparg_count = 0, intarg_count = 0;
238 unsigned flags = 0;
239 unsigned size_al = 0;
240
241 /* All the machine-independent calculation of cif->bytes will be wrong.
242 Redo the calculation for DARWIN. */
243
244 /* Space for the frame pointer, callee's LR, CR, etc, and for
245 the asm's temp regs. */
246
247 bytes = (6 + ASM_NEEDS_REGISTERS) * sizeof(long);
248
249 /* Return value handling. The rules are as follows:
250 - 32-bit (or less) integer values are returned in gpr3;
251 - Structures of size <= 4 bytes also returned in gpr3;
252 - 64-bit integer values and structures between 5 and 8 bytes are returned
253 in gpr3 and gpr4;
254 - Single/double FP values are returned in fpr1;
255 - Long double FP (if not equivalent to double) values are returned in
256 fpr1 and fpr2;
257 - Larger structures values are allocated space and a pointer is passed
258 as the first argument. */
259 switch (cif->rtype->type)
260 {
261
262 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
263 case FFI_TYPE_LONGDOUBLE:
264 flags |= FLAG_RETURNS_128BITS;
265 flags |= FLAG_RETURNS_FP;
266 break;
267 #endif
268
269 case FFI_TYPE_DOUBLE:
270 flags |= FLAG_RETURNS_64BITS;
271 /* Fall through. */
272 case FFI_TYPE_FLOAT:
273 flags |= FLAG_RETURNS_FP;
274 break;
275
276 case FFI_TYPE_UINT64:
277 case FFI_TYPE_SINT64:
278 flags |= FLAG_RETURNS_64BITS;
279 break;
280
281 case FFI_TYPE_STRUCT:
282 flags |= FLAG_RETVAL_REFERENCE;
283 flags |= FLAG_RETURNS_NOTHING;
284 intarg_count++;
285 break;
286 case FFI_TYPE_VOID:
287 flags |= FLAG_RETURNS_NOTHING;
288 break;
289
290 default:
291 /* Returns 32-bit integer, or similar. Nothing to do here. */
292 break;
293 }
294
295 /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the
296 first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest
297 goes on the stack. Structures are passed as a pointer to a copy of
298 the structure. Stuff on the stack needs to keep proper alignment. */
299 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
300 {
301 switch ((*ptr)->type)
302 {
303 case FFI_TYPE_FLOAT:
304 case FFI_TYPE_DOUBLE:
305 fparg_count++;
306 /* If this FP arg is going on the stack, it must be
307 8-byte-aligned. */
308 if (fparg_count > NUM_FPR_ARG_REGISTERS
309 && intarg_count%2 != 0)
310 intarg_count++;
311 break;
312
313 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
314
315 case FFI_TYPE_LONGDOUBLE:
316 fparg_count += 2;
317 /* If this FP arg is going on the stack, it must be
318 8-byte-aligned. */
319 if (fparg_count > NUM_FPR_ARG_REGISTERS
320 && intarg_count%2 != 0)
321 intarg_count++;
322 intarg_count +=2;
323 break;
324 #endif
325
326 case FFI_TYPE_UINT64:
327 case FFI_TYPE_SINT64:
328 /* 'long long' arguments are passed as two words, but
329 either both words must fit in registers or both go
330 on the stack. If they go on the stack, they must
331 be 8-byte-aligned. */
332 if (intarg_count == NUM_GPR_ARG_REGISTERS-1
333 || (intarg_count >= NUM_GPR_ARG_REGISTERS && intarg_count%2 != 0))
334 intarg_count++;
335 intarg_count += 2;
336 break;
337
338 case FFI_TYPE_STRUCT:
339 size_al = (*ptr)->size;
340 /* If the first member of the struct is a double, then align
341 the struct to double-word.
342 Type 3 is defined in include/ffi.h. #define FFI_TYPE_DOUBLE 3. */
343 if ((*ptr)->elements[0]->type == 3)
344 size_al = ALIGN((*ptr)->size, 8);
345 intarg_count += (size_al + 3) / 4;
346 break;
347
348 default:
349 /* Everything else is passed as a 4-byte word in a GPR, either
350 the object itself or a pointer to it. */
351 intarg_count++;
352 break;
353 }
354 }
355
356 if (fparg_count != 0)
357 flags |= FLAG_FP_ARGUMENTS;
358
359 /* Space for the FPR registers, if needed. */
360 if (fparg_count != 0)
361 bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);
362
363 /* Stack space. */
364 if ((intarg_count + 2 * fparg_count) > NUM_GPR_ARG_REGISTERS)
365 bytes += (intarg_count + 2 * fparg_count) * sizeof(long);
366 else
367 bytes += NUM_GPR_ARG_REGISTERS * sizeof(long);
368
369 /* The stack space allocated needs to be a multiple of 16 bytes. */
370 bytes = (bytes + 15) & ~0xF;
371
372 cif->flags = flags;
373 cif->bytes = bytes;
374
375 return FFI_OK;
376 }
377
378 /*@-declundef@*/
379 /*@-exportheader@*/
380 extern void ffi_call_AIX(/*@out@*/ extended_cif *,
381 unsigned, unsigned,
382 /*@out@*/ unsigned *,
383 void (*fn)(),
384 void (*fn2)());
385 extern void ffi_call_DARWIN(/*@out@*/ extended_cif *,
386 unsigned, unsigned,
387 /*@out@*/ unsigned *,
388 void (*fn)(),
389 void (*fn2)());
390 /*@=declundef@*/
391 /*@=exportheader@*/
392
393 void ffi_call(/*@dependent@*/ ffi_cif *cif,
394 void (*fn)(),
395 /*@out@*/ void *rvalue,
396 /*@dependent@*/ void **avalue)
397 {
398 extended_cif ecif;
399
400 ecif.cif = cif;
401 ecif.avalue = avalue;
402
403 /* If the return value is a struct and we don't have a return
404 value address then we need to make one. */
405
406 if ((rvalue == NULL) &&
407 (cif->rtype->type == FFI_TYPE_STRUCT))
408 {
409 /*@-sysunrecog@*/
410 ecif.rvalue = alloca(cif->rtype->size);
411 /*@=sysunrecog@*/
412 }
413 else
414 ecif.rvalue = rvalue;
415
416 switch (cif->abi)
417 {
418 case FFI_AIX:
419 /*@-usedef@*/
420 ffi_call_AIX(&ecif, -cif->bytes,
421 cif->flags, ecif.rvalue, fn, ffi_prep_args);
422 /*@=usedef@*/
423 break;
424 case FFI_DARWIN:
425 /*@-usedef@*/
426 ffi_call_DARWIN(&ecif, -cif->bytes,
427 cif->flags, ecif.rvalue, fn, ffi_prep_args);
428 /*@=usedef@*/
429 break;
430 default:
431 FFI_ASSERT(0);
432 break;
433 }
434 }
435
436 static void flush_icache(char *);
437 static void flush_range(char *, int);
438
439 /* The layout of a function descriptor. A C function pointer really
440 points to one of these. */
441
442 typedef struct aix_fd_struct {
443 void *code_pointer;
444 void *toc;
445 } aix_fd;
446
447 /* here I'd like to add the stack frame layout we use in darwin_closure.S
448 and aix_clsoure.S
449
450 SP previous -> +---------------------------------------+ <--- child frame
451 | back chain to caller 4 |
452 +---------------------------------------+ 4
453 | saved CR 4 |
454 +---------------------------------------+ 8
455 | saved LR 4 |
456 +---------------------------------------+ 12
457 | reserved for compilers 4 |
458 +---------------------------------------+ 16
459 | reserved for binders 4 |
460 +---------------------------------------+ 20
461 | saved TOC pointer 4 |
462 +---------------------------------------+ 24
463 | always reserved 8*4=32 (previous GPRs)|
464 | according to the linkage convention |
465 | from AIX |
466 +---------------------------------------+ 56
467 | our FPR area 13*8=104 |
468 | f1 |
469 | . |
470 | f13 |
471 +---------------------------------------+ 160
472 | result area 8 |
473 +---------------------------------------+ 168
474 | alignement to the next multiple of 16 |
475 SP current --> +---------------------------------------+ 176 <- parent frame
476 | back chain to caller 4 |
477 +---------------------------------------+ 180
478 | saved CR 4 |
479 +---------------------------------------+ 184
480 | saved LR 4 |
481 +---------------------------------------+ 188
482 | reserved for compilers 4 |
483 +---------------------------------------+ 192
484 | reserved for binders 4 |
485 +---------------------------------------+ 196
486 | saved TOC pointer 4 |
487 +---------------------------------------+ 200
488 | always reserved 8*4=32 we store our |
489 | GPRs here |
490 | r3 |
491 | . |
492 | r10 |
493 +---------------------------------------+ 232
494 | overflow part |
495 +---------------------------------------+ xxx
496 | ???? |
497 +---------------------------------------+ xxx
498
499 */
500 ffi_status
501 ffi_prep_closure (ffi_closure* closure,
502 ffi_cif* cif,
503 void (*fun)(ffi_cif*, void*, void**, void*),
504 void *user_data)
505 {
506 unsigned int *tramp;
507 struct ffi_aix_trampoline_struct *tramp_aix;
508 aix_fd *fd;
509
510 switch (cif->abi)
511 {
512 case FFI_DARWIN:
513
514 FFI_ASSERT (cif->abi == FFI_DARWIN);
515
516 tramp = (unsigned int *) &closure->tramp[0];
517 tramp[0] = 0x7c0802a6; /* mflr r0 */
518 tramp[1] = 0x429f000d; /* bcl- 20,4*cr7+so,0x10 */
519 tramp[4] = 0x7d6802a6; /* mflr r11 */
520 tramp[5] = 0x818b0000; /* lwz r12,0(r11) function address */
521 tramp[6] = 0x7c0803a6; /* mtlr r0 */
522 tramp[7] = 0x7d8903a6; /* mtctr r12 */
523 tramp[8] = 0x816b0004; /* lwz r11,4(r11) static chain */
524 tramp[9] = 0x4e800420; /* bctr */
525 tramp[2] = (unsigned long) ffi_closure_ASM; /* function */
526 tramp[3] = (unsigned long) closure; /* context */
527
528 closure->cif = cif;
529 closure->fun = fun;
530 closure->user_data = user_data;
531
532 /* Flush the icache. Only necessary on Darwin. */
533 flush_range(&closure->tramp[0],FFI_TRAMPOLINE_SIZE);
534
535 break;
536
537 case FFI_AIX:
538
539 tramp_aix = (struct ffi_aix_trampoline_struct *) (closure->tramp);
540 fd = (aix_fd *)(void *)ffi_closure_ASM;
541
542 FFI_ASSERT (cif->abi == FFI_AIX);
543
544 tramp_aix->code_pointer = fd->code_pointer;
545 tramp_aix->toc = fd->toc;
546 tramp_aix->static_chain = closure;
547 closure->cif = cif;
548 closure->fun = fun;
549 closure->user_data = user_data;
550
551 default:
552
553 FFI_ASSERT(0);
554 break;
555 }
556 return FFI_OK;
557 }
558
559 static void
560 flush_icache(char *addr)
561 {
562 #ifndef _AIX
563 __asm__ volatile (
564 "dcbf 0,%0\n"
565 "\tsync\n"
566 "\ticbi 0,%0\n"
567 "\tsync\n"
568 "\tisync"
569 : : "r"(addr) : "memory");
570 #endif
571 }
572
573 static void
574 flush_range(char * addr1, int size)
575 {
576 #define MIN_LINE_SIZE 32
577 int i;
578 for (i = 0; i < size; i += MIN_LINE_SIZE)
579 flush_icache(addr1+i);
580 flush_icache(addr1+size-1);
581 }
582
583 typedef union
584 {
585 float f;
586 double d;
587 } ffi_dblfl;
588
589 int ffi_closure_helper_DARWIN (ffi_closure*, void*,
590 unsigned long*, ffi_dblfl*);
591
592 /* Basically the trampoline invokes ffi_closure_ASM, and on
593 entry, r11 holds the address of the closure.
594 After storing the registers that could possibly contain
595 parameters to be passed into the stack frame and setting
596 up space for a return value, ffi_closure_ASM invokes the
597 following helper function to do most of the work. */
598
599 int ffi_closure_helper_DARWIN (ffi_closure* closure, void * rvalue,
600 unsigned long * pgr, ffi_dblfl * pfr)
601 {
602 /* rvalue is the pointer to space for return value in closure assembly
603 pgr is the pointer to where r3-r10 are stored in ffi_closure_ASM
604 pfr is the pointer to where f1-f13 are stored in ffi_closure_ASM. */
605
606 typedef double ldbits[2];
607
608 union ldu
609 {
610 ldbits lb;
611 long double ld;
612 };
613
614 void ** avalue;
615 ffi_type ** arg_types;
616 long i, avn;
617 long nf; /* number of floating registers already used. */
618 long ng; /* number of general registers already used. */
619 ffi_cif * cif;
620 double temp;
621 unsigned size_al;
622 union ldu temp_ld;
623
624 cif = closure->cif;
625 avalue = alloca(cif->nargs * sizeof(void *));
626
627 nf = 0;
628 ng = 0;
629
630 /* Copy the caller's structure return value address so that the closure
631 returns the data directly to the caller. */
632 if (cif->rtype->type == FFI_TYPE_STRUCT)
633 {
634 rvalue = (void *) *pgr;
635 pgr++;
636 ng++;
637 }
638
639 i = 0;
640 avn = cif->nargs;
641 arg_types = cif->arg_types;
642
643 /* Grab the addresses of the arguments from the stack frame. */
644 while (i < avn)
645 {
646 switch (arg_types[i]->type)
647 {
648 case FFI_TYPE_SINT8:
649 case FFI_TYPE_UINT8:
650 avalue[i] = (char *) pgr + 3;
651 ng++;
652 pgr++;
653 break;
654
655 case FFI_TYPE_SINT16:
656 case FFI_TYPE_UINT16:
657 avalue[i] = (char *) pgr + 2;
658 ng++;
659 pgr++;
660 break;
661
662 case FFI_TYPE_SINT32:
663 case FFI_TYPE_UINT32:
664 case FFI_TYPE_POINTER:
665 avalue[i] = pgr;
666 ng++;
667 pgr++;
668 break;
669
670 case FFI_TYPE_STRUCT:
671 /* Structures that match the basic modes (QI 1 byte, HI 2 bytes,
672 SI 4 bytes) are aligned as if they were those modes. */
673 size_al = arg_types[i]->size;
674 /* If the first member of the struct is a double, then align
675 the struct to double-word.
676 Type 3 is defined in include/ffi.h. #define FFI_TYPE_DOUBLE 3. */
677 if (arg_types[i]->elements[0]->type == 3)
678 size_al = ALIGN(arg_types[i]->size, 8);
679 if (size_al < 3 && cif->abi == FFI_DARWIN)
680 avalue[i] = (void*) pgr + 4 - size_al;
681 else
682 avalue[i] = (void*) pgr;
683 ng += (size_al + 3) / 4;
684 pgr += (size_al + 3) / 4;
685 break;
686
687 case FFI_TYPE_SINT64:
688 case FFI_TYPE_UINT64:
689 /* Long long ints are passed in two gpr's. */
690 avalue[i] = pgr;
691 ng += 2;
692 pgr += 2;
693 break;
694
695 case FFI_TYPE_FLOAT:
696 /* A float value consumes a GPR.
697 There are 13 64bit floating point registers. */
698 if (nf < NUM_FPR_ARG_REGISTERS)
699 {
700 temp = pfr->d;
701 pfr->f = (float)temp;
702 avalue[i] = pfr;
703 pfr++;
704 }
705 else
706 {
707 avalue[i] = pgr;
708 }
709 nf++;
710 ng++;
711 pgr++;
712 break;
713
714 case FFI_TYPE_DOUBLE:
715 /* A double value consumes two GPRs.
716 There are 13 64bit floating point registers. */
717 if (nf < NUM_FPR_ARG_REGISTERS)
718 {
719 avalue[i] = pfr;
720 pfr++;
721 }
722 else
723 {
724 avalue[i] = pgr;
725 }
726 nf++;
727 ng += 2;
728 pgr += 2;
729 break;
730
731 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
732
733 case FFI_TYPE_LONGDOUBLE:
734 /* A long double value consumes four GPRs and two FPRs.
735 There are 13 64bit floating point registers. */
736 if (nf < NUM_FPR_ARG_REGISTERS - 1)
737 {
738 avalue[i] = pfr;
739 pfr += 2;
740 }
741 /* Here we have the situation where one part of the long double
742 is stored in fpr13 and the other part is already on the stack.
743 We use a union to pass the long double to avalue[i]. */
744 else if (nf == NUM_FPR_ARG_REGISTERS - 1)
745 {
746 memcpy (&temp_ld.lb[0], pfr, sizeof(ldbits));
747 memcpy (&temp_ld.lb[1], pgr + 2, sizeof(ldbits));
748 avalue[i] = &temp_ld.ld;
749 }
750 else
751 {
752 avalue[i] = pgr;
753 }
754 nf += 2;
755 ng += 4;
756 pgr += 4;
757 break;
758 #endif
759 default:
760 FFI_ASSERT(0);
761 }
762 i++;
763 }
764
765 (closure->fun) (cif, rvalue, avalue, closure->user_data);
766
767 /* Tell ffi_closure_ASM to perform return type promotions. */
768 return cif->rtype->type;
769 }
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