1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (c) 1998 Geoffrey Keating
4 PowerPC Foreign Function Interface
6 $Id: ffi.c,v 1.1.1.1 1998/11/29 16:48:16 green Exp $
8 Permission is hereby granted, free of charge, to any person obtaining
9 a copy of this software and associated documentation files (the
10 ``Software''), to deal in the Software without restriction, including
11 without limitation the rights to use, copy, modify, merge, publish,
12 distribute, sublicense, and/or sell copies of the Software, and to
13 permit persons to whom the Software is furnished to do so, subject to
14 the following conditions:
16 The above copyright notice and this permission notice shall be included
17 in all copies or substantial portions of the Software.
19 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 OTHER DEALINGS IN THE SOFTWARE.
26 ----------------------------------------------------------------------- */
29 #include <ffi_common.h>
34 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 1)
35 # define hidden __attribute__ ((visibility ("hidden")))
41 extern void ffi_closure_SYSV(void);
42 extern void hidden ffi_closure_LINUX64(void);
45 /* The assembly depends on these exact flags. */
46 FLAG_RETURNS_NOTHING = 1 << (31-30), /* These go in cr7 */
47 FLAG_RETURNS_FP = 1 << (31-29),
48 FLAG_RETURNS_64BITS = 1 << (31-28),
50 FLAG_ARG_NEEDS_COPY = 1 << (31- 7),
51 FLAG_FP_ARGUMENTS = 1 << (31- 6), /* cr1.eq; specified by ABI */
52 FLAG_4_GPR_ARGUMENTS = 1 << (31- 5),
53 FLAG_RETVAL_REFERENCE = 1 << (31- 4)
56 /* About the SYSV ABI. */
58 NUM_GPR_ARG_REGISTERS = 8,
59 NUM_FPR_ARG_REGISTERS = 8
61 enum { ASM_NEEDS_REGISTERS = 4 };
63 /* ffi_prep_args_SYSV is called by the assembly routine once stack space
64 has been allocated for the function's arguments.
66 The stack layout we want looks like this:
68 | Return address from ffi_call_SYSV 4bytes | higher addresses
69 |--------------------------------------------|
70 | Previous backchain pointer 4 | stack pointer here
71 |--------------------------------------------|<+ <<< on entry to
72 | Saved r28-r31 4*4 | | ffi_call_SYSV
73 |--------------------------------------------| |
74 | GPR registers r3-r10 8*4 | | ffi_call_SYSV
75 |--------------------------------------------| |
76 | FPR registers f1-f8 (optional) 8*8 | |
77 |--------------------------------------------| | stack |
78 | Space for copied structures | | grows |
79 |--------------------------------------------| | down V
80 | Parameters that didn't fit in registers | |
81 |--------------------------------------------| | lower addresses
82 | Space for callee's LR 4 | |
83 |--------------------------------------------| | stack pointer here
84 | Current backchain pointer 4 |-/ during
85 |--------------------------------------------| <<< ffi_call_SYSV
90 void ffi_prep_args_SYSV(extended_cif *ecif, unsigned *const stack)
93 const unsigned bytes = ecif->cif->bytes;
94 const unsigned flags = ecif->cif->flags;
96 /* 'stacktop' points at the previous backchain pointer. */
97 unsigned *const stacktop = stack + (ecif->cif->bytes / sizeof(unsigned));
99 /* 'gpr_base' points at the space for gpr3, and grows upwards as
100 we use GPR registers. */
101 unsigned *gpr_base = stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS;
102 int intarg_count = 0;
104 /* 'fpr_base' points at the space for fpr1, and grows upwards as
105 we use FPR registers. */
106 double *fpr_base = (double *)gpr_base - NUM_FPR_ARG_REGISTERS;
109 /* 'copy_space' grows down as we put structures in it. It should
110 stay 16-byte aligned. */
111 char *copy_space = ((flags & FLAG_FP_ARGUMENTS)
115 /* 'next_arg' grows up as we put parameters in it. */
116 unsigned *next_arg = stack + 2;
122 size_t struct_copy_size;
125 /* Check that everything starts aligned properly. */
126 FFI_ASSERT(((unsigned)(char *)stack & 0xF) == 0);
127 FFI_ASSERT(((unsigned)(char *)copy_space & 0xF) == 0);
128 FFI_ASSERT(((unsigned)(char *)stacktop & 0xF) == 0);
129 FFI_ASSERT((bytes & 0xF) == 0);
130 FFI_ASSERT(copy_space >= (char *)next_arg);
132 /* Deal with return values that are actually pass-by-reference. */
133 if (flags & FLAG_RETVAL_REFERENCE)
135 *gpr_base++ = (unsigned long)(char *)ecif->rvalue;
139 /* Now for the arguments. */
140 p_argv = ecif->avalue;
141 for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs;
143 i--, ptr++, p_argv++)
145 switch ((*ptr)->type)
148 double_tmp = *(float *)*p_argv;
149 if (fparg_count >= NUM_FPR_ARG_REGISTERS)
151 *(float *)next_arg = (float)double_tmp;
155 *fpr_base++ = double_tmp;
157 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
160 case FFI_TYPE_DOUBLE:
161 double_tmp = *(double *)*p_argv;
163 if (fparg_count >= NUM_FPR_ARG_REGISTERS)
165 if (intarg_count%2 != 0)
170 *(double *)next_arg = double_tmp;
174 *fpr_base++ = double_tmp;
176 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
179 case FFI_TYPE_UINT64:
180 case FFI_TYPE_SINT64:
181 if (intarg_count == NUM_GPR_ARG_REGISTERS-1)
183 if (intarg_count >= NUM_GPR_ARG_REGISTERS)
185 if (intarg_count%2 != 0)
190 *(long long *)next_arg = *(long long *)*p_argv;
195 /* whoops: abi states only certain register pairs
196 * can be used for passing long long int
197 * specifically (r3,r4), (r5,r6), (r7,r8),
198 * (r9,r10) and if next arg is long long but
199 * not correct starting register of pair then skip
200 * until the proper starting register
202 if (intarg_count%2 != 0)
207 *(long long *)gpr_base = *(long long *)*p_argv;
213 case FFI_TYPE_STRUCT:
214 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
215 case FFI_TYPE_LONGDOUBLE:
217 struct_copy_size = ((*ptr)->size + 15) & ~0xF;
218 copy_space -= struct_copy_size;
219 memcpy(copy_space, (char *)*p_argv, (*ptr)->size);
221 gprvalue = (unsigned long)copy_space;
223 FFI_ASSERT(copy_space > (char *)next_arg);
224 FFI_ASSERT(flags & FLAG_ARG_NEEDS_COPY);
228 gprvalue = *(unsigned char *)*p_argv;
231 gprvalue = *(signed char *)*p_argv;
233 case FFI_TYPE_UINT16:
234 gprvalue = *(unsigned short *)*p_argv;
236 case FFI_TYPE_SINT16:
237 gprvalue = *(signed short *)*p_argv;
241 case FFI_TYPE_UINT32:
242 case FFI_TYPE_SINT32:
243 case FFI_TYPE_POINTER:
244 gprvalue = *(unsigned *)*p_argv;
246 if (intarg_count >= NUM_GPR_ARG_REGISTERS)
247 *next_arg++ = gprvalue;
249 *gpr_base++ = gprvalue;
255 /* Check that we didn't overrun the stack... */
256 FFI_ASSERT(copy_space >= (char *)next_arg);
257 FFI_ASSERT(gpr_base <= stacktop - ASM_NEEDS_REGISTERS);
258 FFI_ASSERT((unsigned *)fpr_base
259 <= stacktop - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS);
260 FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4);
263 /* About the LINUX64 ABI. */
265 NUM_GPR_ARG_REGISTERS64 = 8,
266 NUM_FPR_ARG_REGISTERS64 = 13
268 enum { ASM_NEEDS_REGISTERS64 = 4 };
270 /* ffi_prep_args64 is called by the assembly routine once stack space
271 has been allocated for the function's arguments.
273 The stack layout we want looks like this:
275 | Ret addr from ffi_call_LINUX64 8bytes | higher addresses
276 |--------------------------------------------|
277 | CR save area 8bytes |
278 |--------------------------------------------|
279 | Previous backchain pointer 8 | stack pointer here
280 |--------------------------------------------|<+ <<< on entry to
281 | Saved r28-r31 4*8 | | ffi_call_LINUX64
282 |--------------------------------------------| |
283 | GPR registers r3-r10 8*8 | |
284 |--------------------------------------------| |
285 | FPR registers f1-f13 (optional) 13*8 | |
286 |--------------------------------------------| |
287 | Parameter save area | |
288 |--------------------------------------------| |
289 | TOC save area 8 | |
290 |--------------------------------------------| | stack |
291 | Linker doubleword 8 | | grows |
292 |--------------------------------------------| | down V
293 | Compiler doubleword 8 | |
294 |--------------------------------------------| | lower addresses
295 | Space for callee's LR 8 | |
296 |--------------------------------------------| |
298 |--------------------------------------------| | stack pointer here
299 | Current backchain pointer 8 |-/ during
300 |--------------------------------------------| <<< ffi_call_LINUX64
305 void hidden ffi_prep_args64(extended_cif *ecif, unsigned long *const stack)
308 const unsigned long bytes = ecif->cif->bytes;
309 const unsigned long flags = ecif->cif->flags;
311 /* 'stacktop' points at the previous backchain pointer. */
312 unsigned long *const stacktop = stack + (bytes / sizeof(unsigned long));
314 /* 'next_arg' points at the space for gpr3, and grows upwards as
315 we use GPR registers, then continues at rest. */
316 unsigned long *const gpr_base = stacktop - ASM_NEEDS_REGISTERS64
317 - NUM_GPR_ARG_REGISTERS64;
318 unsigned long *const gpr_end = gpr_base + NUM_GPR_ARG_REGISTERS64;
319 unsigned long *const rest = stack + 6 + NUM_GPR_ARG_REGISTERS64;
320 unsigned long *next_arg = gpr_base;
322 /* 'fpr_base' points at the space for fpr3, and grows upwards as
323 we use FPR registers. */
324 double *fpr_base = (double *)gpr_base - NUM_FPR_ARG_REGISTERS64;
331 unsigned long gprvalue;
333 /* Check that everything starts aligned properly. */
334 FFI_ASSERT(((unsigned long)(char *)stack & 0xF) == 0);
335 FFI_ASSERT(((unsigned long)(char *)stacktop & 0xF) == 0);
336 FFI_ASSERT((bytes & 0xF) == 0);
338 /* Deal with return values that are actually pass-by-reference. */
339 if (flags & FLAG_RETVAL_REFERENCE)
340 *next_arg++ = (unsigned long)(char *)ecif->rvalue;
342 /* Now for the arguments. */
343 p_argv = ecif->avalue;
344 for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs;
346 i--, ptr++, p_argv++)
348 switch ((*ptr)->type)
351 double_tmp = *(float *)*p_argv;
352 *(float *)next_arg = (float)double_tmp;
353 if (++next_arg == gpr_end)
355 if (fparg_count < NUM_FPR_ARG_REGISTERS64)
356 *fpr_base++ = double_tmp;
358 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
361 case FFI_TYPE_DOUBLE:
362 double_tmp = *(double *)*p_argv;
363 *(double *)next_arg = double_tmp;
364 if (++next_arg == gpr_end)
366 if (fparg_count < NUM_FPR_ARG_REGISTERS64)
367 *fpr_base++ = double_tmp;
369 FFI_ASSERT(flags & FLAG_FP_ARGUMENTS);
372 case FFI_TYPE_STRUCT:
373 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
374 case FFI_TYPE_LONGDOUBLE:
376 words = ((*ptr)->size + 7) / 8;
377 if (next_arg >= gpr_base && next_arg + words > gpr_end)
379 size_t first = (char *) gpr_end - (char *) next_arg;
380 memcpy((char *) next_arg, (char *) *p_argv, first);
381 memcpy((char *) rest, (char *) *p_argv + first,
382 (*ptr)->size - first);
383 next_arg = (unsigned long *) ((char *) rest + words * 8 - first);
387 char *where = (char *) next_arg;
389 /* Structures with size less than eight bytes are passed
391 if ((*ptr)->size < 8)
392 where += 8 - (*ptr)->size;
394 memcpy (where, (char *) *p_argv, (*ptr)->size);
396 if (next_arg == gpr_end)
402 gprvalue = *(unsigned char *)*p_argv;
405 gprvalue = *(signed char *)*p_argv;
407 case FFI_TYPE_UINT16:
408 gprvalue = *(unsigned short *)*p_argv;
410 case FFI_TYPE_SINT16:
411 gprvalue = *(signed short *)*p_argv;
413 case FFI_TYPE_UINT32:
414 gprvalue = *(unsigned int *)*p_argv;
417 case FFI_TYPE_SINT32:
418 gprvalue = *(signed int *)*p_argv;
421 case FFI_TYPE_UINT64:
422 case FFI_TYPE_SINT64:
423 case FFI_TYPE_POINTER:
424 gprvalue = *(unsigned long *)*p_argv;
426 *next_arg++ = gprvalue;
427 if (next_arg == gpr_end)
433 FFI_ASSERT(flags & FLAG_4_GPR_ARGUMENTS
434 || (next_arg >= gpr_base && next_arg <= gpr_base + 4));
439 /* Perform machine dependent cif processing */
440 ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
442 /* All this is for the SYSV and LINUX64 ABI. */
446 int fparg_count = 0, intarg_count = 0;
448 unsigned struct_copy_size = 0;
449 unsigned type = cif->rtype->type;
451 if (cif->abi != FFI_LINUX64)
453 /* All the machine-independent calculation of cif->bytes will be wrong.
454 Redo the calculation for SYSV. */
456 /* Space for the frame pointer, callee's LR, and the asm's temp regs. */
457 bytes = (2 + ASM_NEEDS_REGISTERS) * sizeof(int);
459 /* Space for the GPR registers. */
460 bytes += NUM_GPR_ARG_REGISTERS * sizeof(int);
466 /* Space for backchain, CR, LR, cc/ld doubleword, TOC and the asm's temp
468 bytes = (6 + ASM_NEEDS_REGISTERS64) * sizeof(long);
470 /* Space for the mandatory parm save area and general registers. */
471 bytes += 2 * NUM_GPR_ARG_REGISTERS64 * sizeof(long);
473 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
474 if (type == FFI_TYPE_LONGDOUBLE)
475 type = FFI_TYPE_DOUBLE;
479 /* Return value handling. The rules for SYSV are as follows:
480 - 32-bit (or less) integer values are returned in gpr3;
481 - Structures of size <= 4 bytes also returned in gpr3;
482 - 64-bit integer values and structures between 5 and 8 bytes are returned
484 - Single/double FP values are returned in fpr1;
485 - Larger structures and long double (if not equivalent to double) values
486 are allocated space and a pointer is passed as the first argument.
488 - integer values in gpr3;
489 - Structures/Unions by reference;
490 - Single/double FP values in fpr1, long double in fpr1,fpr2. */
493 case FFI_TYPE_DOUBLE:
494 flags |= FLAG_RETURNS_64BITS;
497 flags |= FLAG_RETURNS_FP;
500 case FFI_TYPE_UINT64:
501 case FFI_TYPE_SINT64:
502 flags |= FLAG_RETURNS_64BITS;
505 case FFI_TYPE_STRUCT:
506 if (cif->abi != FFI_GCC_SYSV && cif->abi != FFI_LINUX64)
507 if (cif->rtype->size <= 4)
509 else if (cif->rtype->size <= 8)
511 flags |= FLAG_RETURNS_64BITS;
514 /* else fall through. */
515 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
516 case FFI_TYPE_LONGDOUBLE:
519 flags |= FLAG_RETVAL_REFERENCE;
522 flags |= FLAG_RETURNS_NOTHING;
526 /* Returns 32-bit integer, or similar. Nothing to do here. */
530 if (cif->abi != FFI_LINUX64)
531 /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the
532 first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest
533 goes on the stack. Structures and long doubles (if not equivalent
534 to double) are passed as a pointer to a copy of the structure.
535 Stuff on the stack needs to keep proper alignment. */
536 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
538 switch ((*ptr)->type)
542 /* floating singles are not 8-aligned on stack */
545 case FFI_TYPE_DOUBLE:
547 /* If this FP arg is going on the stack, it must be
549 if (fparg_count > NUM_FPR_ARG_REGISTERS
550 && intarg_count%2 != 0)
554 case FFI_TYPE_UINT64:
555 case FFI_TYPE_SINT64:
556 /* 'long long' arguments are passed as two words, but
557 either both words must fit in registers or both go
558 on the stack. If they go on the stack, they must
559 be 8-byte-aligned. */
560 if (intarg_count == NUM_GPR_ARG_REGISTERS-1
561 || (intarg_count >= NUM_GPR_ARG_REGISTERS
562 && intarg_count%2 != 0))
567 case FFI_TYPE_STRUCT:
568 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
569 case FFI_TYPE_LONGDOUBLE:
571 /* We must allocate space for a copy of these to enforce
572 pass-by-value. Pad the space up to a multiple of 16
573 bytes (the maximum alignment required for anything under
575 struct_copy_size += ((*ptr)->size + 15) & ~0xF;
576 /* Fall through (allocate space for the pointer). */
579 /* Everything else is passed as a 4-byte word in a GPR, either
580 the object itself or a pointer to it. */
586 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
588 switch ((*ptr)->type)
590 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
591 case FFI_TYPE_LONGDOUBLE:
597 case FFI_TYPE_DOUBLE:
602 case FFI_TYPE_STRUCT:
603 intarg_count += ((*ptr)->size + 7) / 8;
607 /* Everything else is passed as a 8-byte word in a GPR, either
608 the object itself or a pointer to it. */
614 if (fparg_count != 0)
615 flags |= FLAG_FP_ARGUMENTS;
616 if (intarg_count > 4)
617 flags |= FLAG_4_GPR_ARGUMENTS;
618 if (struct_copy_size != 0)
619 flags |= FLAG_ARG_NEEDS_COPY;
621 if (cif->abi != FFI_LINUX64)
623 /* Space for the FPR registers, if needed. */
624 if (fparg_count != 0)
625 bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);
628 if (intarg_count > NUM_GPR_ARG_REGISTERS)
629 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS) * sizeof(int);
630 if (fparg_count > NUM_FPR_ARG_REGISTERS)
631 bytes += (fparg_count - NUM_FPR_ARG_REGISTERS) * sizeof(double);
635 /* Space for the FPR registers, if needed. */
636 if (fparg_count != 0)
637 bytes += NUM_FPR_ARG_REGISTERS64 * sizeof(double);
640 if (intarg_count > NUM_GPR_ARG_REGISTERS64)
641 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS64) * sizeof(long);
644 /* The stack space allocated needs to be a multiple of 16 bytes. */
645 bytes = (bytes + 15) & ~0xF;
647 /* Add in the space for the copied structures. */
648 bytes += struct_copy_size;
658 extern void ffi_call_SYSV(/*@out@*/ extended_cif *,
660 /*@out@*/ unsigned *,
662 extern void hidden ffi_call_LINUX64(/*@out@*/ extended_cif *,
663 unsigned long, unsigned long,
664 /*@out@*/ unsigned long *,
669 void ffi_call(/*@dependent@*/ ffi_cif *cif,
671 /*@out@*/ void *rvalue,
672 /*@dependent@*/ void **avalue)
677 ecif.avalue = avalue;
679 /* If the return value is a struct and we don't have a return */
680 /* value address then we need to make one */
682 if ((rvalue == NULL) &&
683 (cif->rtype->type == FFI_TYPE_STRUCT))
686 ecif.rvalue = alloca(cif->rtype->size);
690 ecif.rvalue = rvalue;
699 ffi_call_SYSV(&ecif, -cif->bytes,
700 cif->flags, ecif.rvalue, fn);
706 ffi_call_LINUX64(&ecif, -(long) cif->bytes,
707 cif->flags, ecif.rvalue, fn);
719 static void flush_icache(char *, int);
721 #define MIN_CACHE_LINE_SIZE 8
723 static void flush_icache(char * addr1, int size)
727 for (i = 0; i < size; i += MIN_CACHE_LINE_SIZE) {
729 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%0;" : : "r"(addr) : "memory");
731 addr = addr1 + size - 1;
732 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%0;" "sync;" "isync;" : : "r"(addr) : "memory");
737 ffi_prep_closure (ffi_closure* closure,
739 void (*fun)(ffi_cif*, void*, void**, void*),
743 void **tramp = (void **) &closure->tramp[0];
745 FFI_ASSERT (cif->abi == FFI_LINUX64);
746 /* Copy function address and TOC from ffi_closure_LINUX64. */
747 memcpy (tramp, (char *) ffi_closure_LINUX64, 16);
748 tramp[2] = (void *) closure;
752 FFI_ASSERT (cif->abi == FFI_GCC_SYSV);
754 tramp = (unsigned int *) &closure->tramp[0];
755 tramp[0] = 0x7c0802a6; /* mflr r0 */
756 tramp[1] = 0x4800000d; /* bl 10 <trampoline_initial+0x10> */
757 tramp[4] = 0x7d6802a6; /* mflr r11 */
758 tramp[5] = 0x7c0803a6; /* mtlr r0 */
759 tramp[6] = 0x800b0000; /* lwz r0,0(r11) */
760 tramp[7] = 0x816b0004; /* lwz r11,4(r11) */
761 tramp[8] = 0x7c0903a6; /* mtctr r0 */
762 tramp[9] = 0x4e800420; /* bctr */
763 *(void **) &tramp[2] = (void *)ffi_closure_SYSV; /* function */
764 *(void **) &tramp[3] = (void *)closure; /* context */
766 /* Flush the icache. */
767 flush_icache(&closure->tramp[0],FFI_TRAMPOLINE_SIZE);
772 closure->user_data = user_data;
783 int ffi_closure_helper_SYSV (ffi_closure*, void*, unsigned long*,
784 ffi_dblfl*, unsigned long*);
786 /* Basically the trampoline invokes ffi_closure_SYSV, and on
787 * entry, r11 holds the address of the closure.
788 * After storing the registers that could possibly contain
789 * parameters to be passed into the stack frame and setting
790 * up space for a return value, ffi_closure_SYSV invokes the
791 * following helper function to do most of the work
795 ffi_closure_helper_SYSV (ffi_closure* closure, void * rvalue,
796 unsigned long * pgr, ffi_dblfl * pfr,
799 /* rvalue is the pointer to space for return value in closure assembly */
800 /* pgr is the pointer to where r3-r10 are stored in ffi_closure_SYSV */
801 /* pfr is the pointer to where f1-f8 are stored in ffi_closure_SYSV */
802 /* pst is the pointer to outgoing parameter stack in original caller */
805 ffi_type ** arg_types;
807 long nf; /* number of floating registers already used */
808 long ng; /* number of general registers already used */
813 avalue = alloca(cif->nargs * sizeof(void *));
818 /* Copy the caller's structure return value address so that the closure
819 returns the data directly to the caller. */
820 if (cif->rtype->type == FFI_TYPE_STRUCT)
822 rvalue = (void *) *pgr;
829 arg_types = cif->arg_types;
831 /* Grab the addresses of the arguments from the stack frame. */
834 switch (arg_types[i]->type)
838 /* there are 8 gpr registers used to pass values */
840 avalue[i] = (((char *)pgr)+3);
844 avalue[i] = (((char *)pst)+3);
849 case FFI_TYPE_SINT16:
850 case FFI_TYPE_UINT16:
851 /* there are 8 gpr registers used to pass values */
853 avalue[i] = (((char *)pgr)+2);
857 avalue[i] = (((char *)pst)+2);
862 case FFI_TYPE_SINT32:
863 case FFI_TYPE_UINT32:
864 case FFI_TYPE_POINTER:
865 /* there are 8 gpr registers used to pass values */
876 case FFI_TYPE_STRUCT:
877 /* Structs are passed by reference. The address will appear in a
878 gpr if it is one of the first 8 arguments. */
880 avalue[i] = (void *) *pgr;
884 avalue[i] = (void *) *pst;
889 case FFI_TYPE_SINT64:
890 case FFI_TYPE_UINT64:
891 /* passing long long ints are complex, they must
892 * be passed in suitable register pairs such as
893 * (r3,r4) or (r5,r6) or (r6,r7), or (r7,r8) or (r9,r10)
894 * and if the entire pair aren't available then the outgoing
895 * parameter stack is used for both but an alignment of 8
896 * must will be kept. So we must either look in pgr
897 * or pst to find the correct address for this type
902 /* skip r4, r6, r8 as starting points */
910 if (((long)pst) & 4) pst++;
917 /* unfortunately float values are stored as doubles
918 * in the ffi_closure_SYSV code (since we don't check
919 * the type in that routine).
922 /* there are 8 64bit floating point registers */
926 pfr->f = (float)temp;
931 /* FIXME? here we are really changing the values
932 * stored in the original calling routines outgoing
933 * parameter stack. This is probably a really
934 * naughty thing to do but...
942 case FFI_TYPE_DOUBLE:
943 /* On the outgoing stack all values are aligned to 8 */
944 /* there are 8 64bit floating point registers */
951 if (((long)pst) & 4) pst++;
966 (closure->fun) (cif, rvalue, avalue, closure->user_data);
968 /* Tell ffi_closure_SYSV how to perform return type promotions. */
969 return cif->rtype->type;
973 int hidden ffi_closure_helper_LINUX64 (ffi_closure*, void*, unsigned long*,
977 ffi_closure_helper_LINUX64 (ffi_closure *closure, void *rvalue,
978 unsigned long *pst, ffi_dblfl *pfr)
980 /* rvalue is the pointer to space for return value in closure assembly */
981 /* pst is the pointer to parameter save area
982 (r3-r10 are stored into its first 8 slots by ffi_closure_LINUX64) */
983 /* pfr is the pointer to where f1-f13 are stored in ffi_closure_LINUX64 */
986 ffi_type **arg_types;
989 ffi_dblfl *end_pfr = pfr + NUM_FPR_ARG_REGISTERS64;
992 avalue = alloca (cif->nargs * sizeof (void *));
994 /* Copy the caller's structure return value address so that the closure
995 returns the data directly to the caller. */
996 if (cif->rtype->type == FFI_TYPE_STRUCT)
998 rvalue = (void *) *pst;
1004 arg_types = cif->arg_types;
1006 /* Grab the addresses of the arguments from the stack frame. */
1009 switch (arg_types[i]->type)
1011 case FFI_TYPE_SINT8:
1012 case FFI_TYPE_UINT8:
1013 avalue[i] = (char *) pst + 7;
1017 case FFI_TYPE_SINT16:
1018 case FFI_TYPE_UINT16:
1019 avalue[i] = (char *) pst + 6;
1023 case FFI_TYPE_SINT32:
1024 case FFI_TYPE_UINT32:
1025 avalue[i] = (char *) pst + 4;
1029 case FFI_TYPE_SINT64:
1030 case FFI_TYPE_UINT64:
1031 case FFI_TYPE_POINTER:
1036 case FFI_TYPE_STRUCT:
1037 /* Structures with size less than eight bytes are passed
1039 if (arg_types[i]->size < 8)
1040 avalue[i] = (char *) pst + 8 - arg_types[i]->size;
1043 pst += (arg_types[i]->size + 7) / 8;
1046 case FFI_TYPE_FLOAT:
1047 /* unfortunately float values are stored as doubles
1048 * in the ffi_closure_LINUX64 code (since we don't check
1049 * the type in that routine).
1052 /* there are 13 64bit floating point registers */
1056 double temp = pfr->d;
1057 pfr->f = (float) temp;
1066 case FFI_TYPE_DOUBLE:
1067 /* On the outgoing stack all values are aligned to 8 */
1068 /* there are 13 64bit floating point registers */
1080 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
1081 case FFI_TYPE_LONGDOUBLE:
1082 if (prf + 1 < end_pfr)
1091 /* Passed partly in f13 and partly on the stack.
1092 Move it all to the stack. */
1093 *pst = *(unsigned long *) pfr;
1110 (closure->fun) (cif, rvalue, avalue, closure->user_data);
1112 /* Tell ffi_closure_LINUX64 how to perform return type promotions. */
1113 return cif->rtype->type;