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;
450 if (cif->abi != FFI_LINUX64)
452 /* All the machine-independent calculation of cif->bytes will be wrong.
453 Redo the calculation for SYSV. */
455 /* Space for the frame pointer, callee's LR, and the asm's temp regs. */
456 bytes = (2 + ASM_NEEDS_REGISTERS) * sizeof(int);
458 /* Space for the GPR registers. */
459 bytes += NUM_GPR_ARG_REGISTERS * sizeof(int);
465 /* Space for backchain, CR, LR, cc/ld doubleword, TOC and the asm's temp
467 bytes = (6 + ASM_NEEDS_REGISTERS64) * sizeof(long);
469 /* Space for the mandatory parm save area and general registers. */
470 bytes += 2 * NUM_GPR_ARG_REGISTERS64 * sizeof(long);
473 /* Return value handling. The rules for SYSV are as follows:
474 - 32-bit (or less) integer values are returned in gpr3;
475 - Structures of size <= 4 bytes also returned in gpr3;
476 - 64-bit integer values and structures between 5 and 8 bytes are returned
478 - Single/double FP values are returned in fpr1;
479 - Larger structures and long double (if not equivalent to double) values
480 are allocated space and a pointer is passed as the first argument.
482 - integer values in gpr3;
483 - Structures/Unions and long double by reference;
484 - Single/double FP values in fpr1. */
485 switch (cif->rtype->type)
487 case FFI_TYPE_DOUBLE:
488 flags |= FLAG_RETURNS_64BITS;
491 flags |= FLAG_RETURNS_FP;
494 case FFI_TYPE_UINT64:
495 case FFI_TYPE_SINT64:
496 flags |= FLAG_RETURNS_64BITS;
499 case FFI_TYPE_STRUCT:
500 if (cif->abi != FFI_GCC_SYSV && cif->abi != FFI_LINUX64)
501 if (cif->rtype->size <= 4)
503 else if (cif->rtype->size <= 8)
505 flags |= FLAG_RETURNS_64BITS;
508 /* else fall through. */
509 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
510 case FFI_TYPE_LONGDOUBLE:
513 flags |= FLAG_RETVAL_REFERENCE;
516 flags |= FLAG_RETURNS_NOTHING;
520 /* Returns 32-bit integer, or similar. Nothing to do here. */
524 if (cif->abi != FFI_LINUX64)
525 /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the
526 first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest
527 goes on the stack. Structures and long doubles (if not equivalent
528 to double) are passed as a pointer to a copy of the structure.
529 Stuff on the stack needs to keep proper alignment. */
530 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
532 switch ((*ptr)->type)
536 /* floating singles are not 8-aligned on stack */
539 case FFI_TYPE_DOUBLE:
541 /* If this FP arg is going on the stack, it must be
543 if (fparg_count > NUM_FPR_ARG_REGISTERS
544 && intarg_count%2 != 0)
548 case FFI_TYPE_UINT64:
549 case FFI_TYPE_SINT64:
550 /* 'long long' arguments are passed as two words, but
551 either both words must fit in registers or both go
552 on the stack. If they go on the stack, they must
553 be 8-byte-aligned. */
554 if (intarg_count == NUM_GPR_ARG_REGISTERS-1
555 || (intarg_count >= NUM_GPR_ARG_REGISTERS
556 && intarg_count%2 != 0))
561 case FFI_TYPE_STRUCT:
562 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
563 case FFI_TYPE_LONGDOUBLE:
565 /* We must allocate space for a copy of these to enforce
566 pass-by-value. Pad the space up to a multiple of 16
567 bytes (the maximum alignment required for anything under
569 struct_copy_size += ((*ptr)->size + 15) & ~0xF;
570 /* Fall through (allocate space for the pointer). */
573 /* Everything else is passed as a 4-byte word in a GPR, either
574 the object itself or a pointer to it. */
580 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
582 switch ((*ptr)->type)
585 case FFI_TYPE_DOUBLE:
590 case FFI_TYPE_STRUCT:
591 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
592 case FFI_TYPE_LONGDOUBLE:
594 intarg_count += ((*ptr)->size + 7) / 8;
598 /* Everything else is passed as a 8-byte word in a GPR, either
599 the object itself or a pointer to it. */
605 if (fparg_count != 0)
606 flags |= FLAG_FP_ARGUMENTS;
607 if (intarg_count > 4)
608 flags |= FLAG_4_GPR_ARGUMENTS;
609 if (struct_copy_size != 0)
610 flags |= FLAG_ARG_NEEDS_COPY;
612 if (cif->abi != FFI_LINUX64)
614 /* Space for the FPR registers, if needed. */
615 if (fparg_count != 0)
616 bytes += NUM_FPR_ARG_REGISTERS * sizeof(double);
619 if (intarg_count > NUM_GPR_ARG_REGISTERS)
620 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS) * sizeof(int);
621 if (fparg_count > NUM_FPR_ARG_REGISTERS)
622 bytes += (fparg_count - NUM_FPR_ARG_REGISTERS) * sizeof(double);
626 /* Space for the FPR registers, if needed. */
627 if (fparg_count != 0)
628 bytes += NUM_FPR_ARG_REGISTERS64 * sizeof(double);
631 if (intarg_count > NUM_GPR_ARG_REGISTERS64)
632 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS64) * sizeof(long);
635 /* The stack space allocated needs to be a multiple of 16 bytes. */
636 bytes = (bytes + 15) & ~0xF;
638 /* Add in the space for the copied structures. */
639 bytes += struct_copy_size;
649 extern void ffi_call_SYSV(/*@out@*/ extended_cif *,
651 /*@out@*/ unsigned *,
653 extern void hidden ffi_call_LINUX64(/*@out@*/ extended_cif *,
654 unsigned long, unsigned long,
655 /*@out@*/ unsigned long *,
660 void ffi_call(/*@dependent@*/ ffi_cif *cif,
662 /*@out@*/ void *rvalue,
663 /*@dependent@*/ void **avalue)
668 ecif.avalue = avalue;
670 /* If the return value is a struct and we don't have a return */
671 /* value address then we need to make one */
673 if ((rvalue == NULL) &&
674 (cif->rtype->type == FFI_TYPE_STRUCT))
677 ecif.rvalue = alloca(cif->rtype->size);
681 ecif.rvalue = rvalue;
690 ffi_call_SYSV(&ecif, -cif->bytes,
691 cif->flags, ecif.rvalue, fn);
697 ffi_call_LINUX64(&ecif, -(long) cif->bytes,
698 cif->flags, ecif.rvalue, fn);
710 static void flush_icache(char *, int);
712 #define MIN_CACHE_LINE_SIZE 8
714 static void flush_icache(char * addr1, int size)
718 for (i = 0; i < size; i += MIN_CACHE_LINE_SIZE) {
720 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%0;" : : "r"(addr) : "memory");
722 addr = addr1 + size - 1;
723 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%0;" "sync;" "isync;" : : "r"(addr) : "memory");
728 ffi_prep_closure (ffi_closure* closure,
730 void (*fun)(ffi_cif*, void*, void**, void*),
734 void **tramp = (void **) &closure->tramp[0];
736 FFI_ASSERT (cif->abi == FFI_LINUX64);
737 /* Copy function address and TOC from ffi_closure_LINUX64. */
738 memcpy (tramp, (char *) ffi_closure_LINUX64, 16);
739 tramp[2] = (void *) closure;
743 FFI_ASSERT (cif->abi == FFI_GCC_SYSV);
745 tramp = (unsigned int *) &closure->tramp[0];
746 tramp[0] = 0x7c0802a6; /* mflr r0 */
747 tramp[1] = 0x4800000d; /* bl 10 <trampoline_initial+0x10> */
748 tramp[4] = 0x7d6802a6; /* mflr r11 */
749 tramp[5] = 0x7c0803a6; /* mtlr r0 */
750 tramp[6] = 0x800b0000; /* lwz r0,0(r11) */
751 tramp[7] = 0x816b0004; /* lwz r11,4(r11) */
752 tramp[8] = 0x7c0903a6; /* mtctr r0 */
753 tramp[9] = 0x4e800420; /* bctr */
754 *(void **) &tramp[2] = (void *)ffi_closure_SYSV; /* function */
755 *(void **) &tramp[3] = (void *)closure; /* context */
757 /* Flush the icache. */
758 flush_icache(&closure->tramp[0],FFI_TRAMPOLINE_SIZE);
763 closure->user_data = user_data;
774 int ffi_closure_helper_SYSV (ffi_closure*, void*, unsigned long*,
775 ffi_dblfl*, unsigned long*);
777 /* Basically the trampoline invokes ffi_closure_SYSV, and on
778 * entry, r11 holds the address of the closure.
779 * After storing the registers that could possibly contain
780 * parameters to be passed into the stack frame and setting
781 * up space for a return value, ffi_closure_SYSV invokes the
782 * following helper function to do most of the work
786 ffi_closure_helper_SYSV (ffi_closure* closure, void * rvalue,
787 unsigned long * pgr, ffi_dblfl * pfr,
790 /* rvalue is the pointer to space for return value in closure assembly */
791 /* pgr is the pointer to where r3-r10 are stored in ffi_closure_SYSV */
792 /* pfr is the pointer to where f1-f8 are stored in ffi_closure_SYSV */
793 /* pst is the pointer to outgoing parameter stack in original caller */
796 ffi_type ** arg_types;
798 long nf; /* number of floating registers already used */
799 long ng; /* number of general registers already used */
804 avalue = alloca(cif->nargs * sizeof(void *));
809 /* Copy the caller's structure return value address so that the closure
810 returns the data directly to the caller. */
811 if (cif->rtype->type == FFI_TYPE_STRUCT)
813 rvalue = (void *) *pgr;
820 arg_types = cif->arg_types;
822 /* Grab the addresses of the arguments from the stack frame. */
825 switch (arg_types[i]->type)
829 /* there are 8 gpr registers used to pass values */
831 avalue[i] = (((char *)pgr)+3);
835 avalue[i] = (((char *)pst)+3);
840 case FFI_TYPE_SINT16:
841 case FFI_TYPE_UINT16:
842 /* there are 8 gpr registers used to pass values */
844 avalue[i] = (((char *)pgr)+2);
848 avalue[i] = (((char *)pst)+2);
853 case FFI_TYPE_SINT32:
854 case FFI_TYPE_UINT32:
855 case FFI_TYPE_POINTER:
856 /* there are 8 gpr registers used to pass values */
867 case FFI_TYPE_STRUCT:
868 /* Structs are passed by reference. The address will appear in a
869 gpr if it is one of the first 8 arguments. */
871 avalue[i] = (void *) *pgr;
875 avalue[i] = (void *) *pst;
880 case FFI_TYPE_SINT64:
881 case FFI_TYPE_UINT64:
882 /* passing long long ints are complex, they must
883 * be passed in suitable register pairs such as
884 * (r3,r4) or (r5,r6) or (r6,r7), or (r7,r8) or (r9,r10)
885 * and if the entire pair aren't available then the outgoing
886 * parameter stack is used for both but an alignment of 8
887 * must will be kept. So we must either look in pgr
888 * or pst to find the correct address for this type
893 /* skip r4, r6, r8 as starting points */
901 if (((long)pst) & 4) pst++;
908 /* unfortunately float values are stored as doubles
909 * in the ffi_closure_SYSV code (since we don't check
910 * the type in that routine).
913 /* there are 8 64bit floating point registers */
917 pfr->f = (float)temp;
922 /* FIXME? here we are really changing the values
923 * stored in the original calling routines outgoing
924 * parameter stack. This is probably a really
925 * naughty thing to do but...
933 case FFI_TYPE_DOUBLE:
934 /* On the outgoing stack all values are aligned to 8 */
935 /* there are 8 64bit floating point registers */
942 if (((long)pst) & 4) pst++;
957 (closure->fun) (cif, rvalue, avalue, closure->user_data);
959 /* Tell ffi_closure_SYSV how to perform return type promotions. */
960 return cif->rtype->type;
964 int hidden ffi_closure_helper_LINUX64 (ffi_closure*, void*, unsigned long*,
968 ffi_closure_helper_LINUX64 (ffi_closure* closure, void * rvalue,
969 unsigned long * pst, ffi_dblfl * pfr)
971 /* rvalue is the pointer to space for return value in closure assembly */
972 /* pst is the pointer to parameter save area
973 (r3-r10 are stored into its first 8 slots by ffi_closure_LINUX64) */
974 /* pfr is the pointer to where f1-f13 are stored in ffi_closure_LINUX64 */
977 ffi_type ** arg_types;
979 long nf; /* number of floating registers already used */
980 long ng; /* number of general registers already used */
985 avalue = alloca(cif->nargs * sizeof(void *));
990 /* Copy the caller's structure return value address so that the closure
991 returns the data directly to the caller. */
992 if (cif->rtype->type == FFI_TYPE_STRUCT)
994 rvalue = (void *) *pst;
1001 arg_types = cif->arg_types;
1003 /* Grab the addresses of the arguments from the stack frame. */
1006 switch (arg_types[i]->type)
1008 case FFI_TYPE_SINT8:
1009 case FFI_TYPE_UINT8:
1010 avalue[i] = (char *) pst + 7;
1015 case FFI_TYPE_SINT16:
1016 case FFI_TYPE_UINT16:
1017 avalue[i] = (char *) pst + 6;
1022 case FFI_TYPE_SINT32:
1023 case FFI_TYPE_UINT32:
1024 avalue[i] = (char *) pst + 4;
1029 case FFI_TYPE_SINT64:
1030 case FFI_TYPE_UINT64:
1031 case FFI_TYPE_POINTER:
1037 case FFI_TYPE_STRUCT:
1038 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
1039 case FFI_TYPE_LONGDOUBLE:
1041 /* Structures with size less than eight bytes are passed
1043 if (arg_types[i]->size < 8)
1044 avalue[i] = (char *) pst + 8 - arg_types[i]->size;
1047 ng += (arg_types[i]->size + 7) / 8;
1048 pst += (arg_types[i]->size + 7) / 8;
1051 case FFI_TYPE_FLOAT:
1052 /* unfortunately float values are stored as doubles
1053 * in the ffi_closure_LINUX64 code (since we don't check
1054 * the type in that routine).
1057 /* there are 13 64bit floating point registers */
1059 if (nf < NUM_FPR_ARG_REGISTERS64) {
1061 pfr->f = (float)temp;
1072 case FFI_TYPE_DOUBLE:
1073 /* On the outgoing stack all values are aligned to 8 */
1074 /* there are 13 64bit floating point registers */
1076 if (nf < NUM_FPR_ARG_REGISTERS64) {
1095 (closure->fun) (cif, rvalue, avalue, closure->user_data);
1097 /* Tell ffi_closure_LINUX64 how to perform return type promotions. */
1098 return cif->rtype->type;