Rebased from gcc
[libffi.git] / src / x86 / ffi.c
1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (c) 1996, 1998, 1999, 2001, 2007, 2008 Red Hat, Inc.
3 Copyright (c) 2002 Ranjit Mathew
4 Copyright (c) 2002 Bo Thorsen
5 Copyright (c) 2002 Roger Sayle
6 Copyright (C) 2008, 2010 Free Software Foundation, Inc.
7
8 x86 Foreign Function Interface
9
10 Permission is hereby granted, free of charge, to any person obtaining
11 a copy of this software and associated documentation files (the
12 ``Software''), to deal in the Software without restriction, including
13 without limitation the rights to use, copy, modify, merge, publish,
14 distribute, sublicense, and/or sell copies of the Software, and to
15 permit persons to whom the Software is furnished to do so, subject to
16 the following conditions:
17
18 The above copyright notice and this permission notice shall be included
19 in all copies or substantial portions of the Software.
20
21 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
22 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
25 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
26 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28 DEALINGS IN THE SOFTWARE.
29 ----------------------------------------------------------------------- */
30
31 #if !defined(__x86_64__) || defined(_WIN64)
32
33 #ifdef _WIN64
34 #include <windows.h>
35 #endif
36
37 #include <ffi.h>
38 #include <ffi_common.h>
39
40 #include <stdlib.h>
41
42 /* ffi_prep_args is called by the assembly routine once stack space
43 has been allocated for the function's arguments */
44
45 void ffi_prep_args(char *stack, extended_cif *ecif)
46 {
47 register unsigned int i;
48 register void **p_argv;
49 register char *argp;
50 register ffi_type **p_arg;
51 #ifdef X86_WIN32
52 size_t p_stack_args[2];
53 void *p_stack_data[2];
54 char *argp2 = stack;
55 int stack_args_count = 0;
56 int cabi = ecif->cif->abi;
57 #endif
58
59 argp = stack;
60
61 if (ecif->cif->flags == FFI_TYPE_STRUCT
62 #ifdef X86_WIN64
63 && (ecif->cif->rtype->size != 1 && ecif->cif->rtype->size != 2
64 && ecif->cif->rtype->size != 4 && ecif->cif->rtype->size != 8)
65 #endif
66 )
67 {
68 *(void **) argp = ecif->rvalue;
69 #ifdef X86_WIN32
70 /* For fastcall/thiscall this is first register-passed
71 argument. */
72 if (cabi == FFI_THISCALL || cabi == FFI_FASTCALL)
73 {
74 p_stack_args[stack_args_count] = sizeof (void*);
75 p_stack_data[stack_args_count] = argp;
76 ++stack_args_count;
77 }
78 #endif
79 argp += sizeof(void*);
80 }
81
82 p_argv = ecif->avalue;
83
84 for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
85 i != 0;
86 i--, p_arg++)
87 {
88 size_t z;
89
90 /* Align if necessary */
91 if ((sizeof(void*) - 1) & (size_t) argp)
92 argp = (char *) ALIGN(argp, sizeof(void*));
93
94 z = (*p_arg)->size;
95 #ifdef X86_WIN64
96 if (z > sizeof(ffi_arg)
97 || ((*p_arg)->type == FFI_TYPE_STRUCT
98 && (z != 1 && z != 2 && z != 4 && z != 8))
99 #if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
100 || ((*p_arg)->type == FFI_TYPE_LONGDOUBLE)
101 #endif
102 )
103 {
104 z = sizeof(ffi_arg);
105 *(void **)argp = *p_argv;
106 }
107 else if ((*p_arg)->type == FFI_TYPE_FLOAT)
108 {
109 memcpy(argp, *p_argv, z);
110 }
111 else
112 #endif
113 if (z < sizeof(ffi_arg))
114 {
115 z = sizeof(ffi_arg);
116 switch ((*p_arg)->type)
117 {
118 case FFI_TYPE_SINT8:
119 *(ffi_sarg *) argp = (ffi_sarg)*(SINT8 *)(* p_argv);
120 break;
121
122 case FFI_TYPE_UINT8:
123 *(ffi_arg *) argp = (ffi_arg)*(UINT8 *)(* p_argv);
124 break;
125
126 case FFI_TYPE_SINT16:
127 *(ffi_sarg *) argp = (ffi_sarg)*(SINT16 *)(* p_argv);
128 break;
129
130 case FFI_TYPE_UINT16:
131 *(ffi_arg *) argp = (ffi_arg)*(UINT16 *)(* p_argv);
132 break;
133
134 case FFI_TYPE_SINT32:
135 *(ffi_sarg *) argp = (ffi_sarg)*(SINT32 *)(* p_argv);
136 break;
137
138 case FFI_TYPE_UINT32:
139 *(ffi_arg *) argp = (ffi_arg)*(UINT32 *)(* p_argv);
140 break;
141
142 case FFI_TYPE_STRUCT:
143 *(ffi_arg *) argp = *(ffi_arg *)(* p_argv);
144 break;
145
146 default:
147 FFI_ASSERT(0);
148 }
149 }
150 else
151 {
152 memcpy(argp, *p_argv, z);
153 }
154
155 #ifdef X86_WIN32
156 /* For thiscall/fastcall convention register-passed arguments
157 are the first two none-floating-point arguments with a size
158 smaller or equal to sizeof (void*). */
159 if ((cabi == FFI_THISCALL && stack_args_count < 1)
160 || (cabi == FFI_FASTCALL && stack_args_count < 2))
161 {
162 if (z <= 4
163 && ((*p_arg)->type != FFI_TYPE_FLOAT
164 && (*p_arg)->type != FFI_TYPE_STRUCT))
165 {
166 p_stack_args[stack_args_count] = z;
167 p_stack_data[stack_args_count] = argp;
168 ++stack_args_count;
169 }
170 }
171 #endif
172 p_argv++;
173 #ifdef X86_WIN64
174 argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
175 #else
176 argp += z;
177 #endif
178 }
179
180 #ifdef X86_WIN32
181 /* We need to move the register-passed arguments for thiscall/fastcall
182 on top of stack, so that those can be moved to registers ecx/edx by
183 call-handler. */
184 if (stack_args_count > 0)
185 {
186 size_t zz = (p_stack_args[0] + 3) & ~3;
187 char *h;
188
189 /* Move first argument to top-stack position. */
190 if (p_stack_data[0] != argp2)
191 {
192 h = alloca (zz + 1);
193 memcpy (h, p_stack_data[0], zz);
194 memmove (argp2 + zz, argp2,
195 (size_t) ((char *) p_stack_data[0] - (char*)argp2));
196 memcpy (argp2, h, zz);
197 }
198
199 argp2 += zz;
200 --stack_args_count;
201 if (zz > 4)
202 stack_args_count = 0;
203
204 /* If we have a second argument, then move it on top
205 after the first one. */
206 if (stack_args_count > 0 && p_stack_data[1] != argp2)
207 {
208 zz = p_stack_args[1];
209 zz = (zz + 3) & ~3;
210 h = alloca (zz + 1);
211 h = alloca (zz + 1);
212 memcpy (h, p_stack_data[1], zz);
213 memmove (argp2 + zz, argp2, (size_t) ((char*) p_stack_data[1] - (char*)argp2));
214 memcpy (argp2, h, zz);
215 }
216 }
217 #endif
218 return;
219 }
220
221 /* Perform machine dependent cif processing */
222 ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
223 {
224 unsigned int i;
225 ffi_type **ptr;
226
227 /* Set the return type flag */
228 switch (cif->rtype->type)
229 {
230 case FFI_TYPE_VOID:
231 case FFI_TYPE_UINT8:
232 case FFI_TYPE_UINT16:
233 case FFI_TYPE_SINT8:
234 case FFI_TYPE_SINT16:
235 #ifdef X86_WIN64
236 case FFI_TYPE_UINT32:
237 case FFI_TYPE_SINT32:
238 #endif
239 case FFI_TYPE_SINT64:
240 case FFI_TYPE_FLOAT:
241 case FFI_TYPE_DOUBLE:
242 #ifndef X86_WIN64
243 #if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
244 case FFI_TYPE_LONGDOUBLE:
245 #endif
246 #endif
247 cif->flags = (unsigned) cif->rtype->type;
248 break;
249
250 case FFI_TYPE_UINT64:
251 #ifdef X86_WIN64
252 case FFI_TYPE_POINTER:
253 #endif
254 cif->flags = FFI_TYPE_SINT64;
255 break;
256
257 case FFI_TYPE_STRUCT:
258 #ifndef X86
259 if (cif->rtype->size == 1)
260 {
261 cif->flags = FFI_TYPE_SMALL_STRUCT_1B; /* same as char size */
262 }
263 else if (cif->rtype->size == 2)
264 {
265 cif->flags = FFI_TYPE_SMALL_STRUCT_2B; /* same as short size */
266 }
267 else if (cif->rtype->size == 4)
268 {
269 #ifdef X86_WIN64
270 cif->flags = FFI_TYPE_SMALL_STRUCT_4B;
271 #else
272 cif->flags = FFI_TYPE_INT; /* same as int type */
273 #endif
274 }
275 else if (cif->rtype->size == 8)
276 {
277 cif->flags = FFI_TYPE_SINT64; /* same as int64 type */
278 }
279 else
280 #endif
281 {
282 cif->flags = FFI_TYPE_STRUCT;
283 /* allocate space for return value pointer */
284 cif->bytes += ALIGN(sizeof(void*), FFI_SIZEOF_ARG);
285 }
286 break;
287
288 default:
289 #ifdef X86_WIN64
290 cif->flags = FFI_TYPE_SINT64;
291 break;
292 case FFI_TYPE_INT:
293 cif->flags = FFI_TYPE_SINT32;
294 #else
295 cif->flags = FFI_TYPE_INT;
296 #endif
297 break;
298 }
299
300 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
301 {
302 if (((*ptr)->alignment - 1) & cif->bytes)
303 cif->bytes = ALIGN(cif->bytes, (*ptr)->alignment);
304 cif->bytes += ALIGN((*ptr)->size, FFI_SIZEOF_ARG);
305 }
306
307 #ifdef X86_WIN64
308 /* ensure space for storing four registers */
309 cif->bytes += 4 * sizeof(ffi_arg);
310 #endif
311
312 #ifdef X86_DARWIN
313 cif->bytes = (cif->bytes + 15) & ~0xF;
314 #endif
315
316 return FFI_OK;
317 }
318
319 #ifdef X86_WIN64
320 extern int
321 ffi_call_win64(void (*)(char *, extended_cif *), extended_cif *,
322 unsigned, unsigned, unsigned *, void (*fn)(void));
323 #elif defined(X86_WIN32)
324 extern void
325 ffi_call_win32(void (*)(char *, extended_cif *), extended_cif *,
326 unsigned, unsigned, unsigned, unsigned *, void (*fn)(void));
327 #else
328 extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
329 unsigned, unsigned, unsigned *, void (*fn)(void));
330 #endif
331
332 void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
333 {
334 extended_cif ecif;
335
336 ecif.cif = cif;
337 ecif.avalue = avalue;
338
339 /* If the return value is a struct and we don't have a return */
340 /* value address then we need to make one */
341
342 #ifdef X86_WIN64
343 if (rvalue == NULL
344 && cif->flags == FFI_TYPE_STRUCT
345 && cif->rtype->size != 1 && cif->rtype->size != 2
346 && cif->rtype->size != 4 && cif->rtype->size != 8)
347 {
348 ecif.rvalue = alloca((cif->rtype->size + 0xF) & ~0xF);
349 }
350 #else
351 if (rvalue == NULL
352 && cif->flags == FFI_TYPE_STRUCT)
353 {
354 ecif.rvalue = alloca(cif->rtype->size);
355 }
356 #endif
357 else
358 ecif.rvalue = rvalue;
359
360
361 switch (cif->abi)
362 {
363 #ifdef X86_WIN64
364 case FFI_WIN64:
365 ffi_call_win64(ffi_prep_args, &ecif, cif->bytes,
366 cif->flags, ecif.rvalue, fn);
367 break;
368 #elif defined(X86_WIN32)
369 case FFI_SYSV:
370 case FFI_STDCALL:
371 ffi_call_win32(ffi_prep_args, &ecif, cif->abi, cif->bytes, cif->flags,
372 ecif.rvalue, fn);
373 break;
374 case FFI_THISCALL:
375 case FFI_FASTCALL:
376 {
377 unsigned int abi = cif->abi;
378 unsigned int i, passed_regs = 0;
379
380 if (cif->flags == FFI_TYPE_STRUCT)
381 ++passed_regs;
382
383 for (i=0; i < cif->nargs && passed_regs < 2;i++)
384 {
385 size_t sz;
386
387 if (cif->arg_types[i]->type == FFI_TYPE_FLOAT
388 || cif->arg_types[i]->type == FFI_TYPE_STRUCT)
389 continue;
390 sz = (cif->arg_types[i]->size + 3) & ~3;
391 if (sz == 0 || sz > 4)
392 continue;
393 ++passed_regs;
394 }
395 if (passed_regs < 2 && abi == FFI_FASTCALL)
396 abi = FFI_THISCALL;
397 if (passed_regs < 1 && abi == FFI_THISCALL)
398 abi = FFI_STDCALL;
399 ffi_call_win32(ffi_prep_args, &ecif, abi, cif->bytes, cif->flags,
400 ecif.rvalue, fn);
401 }
402 break;
403 #else
404 case FFI_SYSV:
405 ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue,
406 fn);
407 break;
408 #endif
409 default:
410 FFI_ASSERT(0);
411 break;
412 }
413 }
414
415
416 /** private members **/
417
418 /* The following __attribute__((regparm(1))) decorations will have no effect
419 on MSVC - standard cdecl convention applies. */
420 static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
421 void** args, ffi_cif* cif);
422 void FFI_HIDDEN ffi_closure_SYSV (ffi_closure *)
423 __attribute__ ((regparm(1)));
424 unsigned int FFI_HIDDEN ffi_closure_SYSV_inner (ffi_closure *, void **, void *)
425 __attribute__ ((regparm(1)));
426 void FFI_HIDDEN ffi_closure_raw_SYSV (ffi_raw_closure *)
427 __attribute__ ((regparm(1)));
428 #ifdef X86_WIN32
429 void FFI_HIDDEN ffi_closure_STDCALL (ffi_closure *)
430 __attribute__ ((regparm(1)));
431 void FFI_HIDDEN ffi_closure_THISCALL (ffi_closure *)
432 __attribute__ ((regparm(1)));
433 #endif
434 #ifdef X86_WIN64
435 void FFI_HIDDEN ffi_closure_win64 (ffi_closure *);
436 #endif
437
438 /* This function is jumped to by the trampoline */
439
440 #ifdef X86_WIN64
441 void * FFI_HIDDEN
442 ffi_closure_win64_inner (ffi_closure *closure, void *args) {
443 ffi_cif *cif;
444 void **arg_area;
445 void *result;
446 void *resp = &result;
447
448 cif = closure->cif;
449 arg_area = (void**) alloca (cif->nargs * sizeof (void*));
450
451 /* this call will initialize ARG_AREA, such that each
452 * element in that array points to the corresponding
453 * value on the stack; and if the function returns
454 * a structure, it will change RESP to point to the
455 * structure return address. */
456
457 ffi_prep_incoming_args_SYSV(args, &resp, arg_area, cif);
458
459 (closure->fun) (cif, resp, arg_area, closure->user_data);
460
461 /* The result is returned in rax. This does the right thing for
462 result types except for floats; we have to 'mov xmm0, rax' in the
463 caller to correct this.
464 TODO: structure sizes of 3 5 6 7 are returned by reference, too!!!
465 */
466 return cif->rtype->size > sizeof(void *) ? resp : *(void **)resp;
467 }
468
469 #else
470 unsigned int FFI_HIDDEN __attribute__ ((regparm(1)))
471 ffi_closure_SYSV_inner (ffi_closure *closure, void **respp, void *args)
472 {
473 /* our various things... */
474 ffi_cif *cif;
475 void **arg_area;
476
477 cif = closure->cif;
478 arg_area = (void**) alloca (cif->nargs * sizeof (void*));
479
480 /* this call will initialize ARG_AREA, such that each
481 * element in that array points to the corresponding
482 * value on the stack; and if the function returns
483 * a structure, it will change RESP to point to the
484 * structure return address. */
485
486 ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif);
487
488 (closure->fun) (cif, *respp, arg_area, closure->user_data);
489
490 return cif->flags;
491 }
492 #endif /* !X86_WIN64 */
493
494 static void
495 ffi_prep_incoming_args_SYSV(char *stack, void **rvalue, void **avalue,
496 ffi_cif *cif)
497 {
498 register unsigned int i;
499 register void **p_argv;
500 register char *argp;
501 register ffi_type **p_arg;
502
503 argp = stack;
504
505 #ifdef X86_WIN64
506 if (cif->rtype->size > sizeof(ffi_arg)
507 || (cif->flags == FFI_TYPE_STRUCT
508 && (cif->rtype->size != 1 && cif->rtype->size != 2
509 && cif->rtype->size != 4 && cif->rtype->size != 8))) {
510 *rvalue = *(void **) argp;
511 argp += sizeof(void *);
512 }
513 #else
514 if ( cif->flags == FFI_TYPE_STRUCT ) {
515 *rvalue = *(void **) argp;
516 argp += sizeof(void *);
517 }
518 #endif
519
520 p_argv = avalue;
521
522 for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
523 {
524 size_t z;
525
526 /* Align if necessary */
527 if ((sizeof(void*) - 1) & (size_t) argp) {
528 argp = (char *) ALIGN(argp, sizeof(void*));
529 }
530
531 #ifdef X86_WIN64
532 if ((*p_arg)->size > sizeof(ffi_arg)
533 || ((*p_arg)->type == FFI_TYPE_STRUCT
534 && ((*p_arg)->size != 1 && (*p_arg)->size != 2
535 && (*p_arg)->size != 4 && (*p_arg)->size != 8)))
536 {
537 z = sizeof(void *);
538 *p_argv = *(void **)argp;
539 }
540 else
541 #endif
542 {
543 z = (*p_arg)->size;
544
545 /* because we're little endian, this is what it turns into. */
546
547 *p_argv = (void*) argp;
548 }
549
550 p_argv++;
551 #ifdef X86_WIN64
552 argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
553 #else
554 argp += z;
555 #endif
556 }
557
558 return;
559 }
560
561 #define FFI_INIT_TRAMPOLINE_WIN64(TRAMP,FUN,CTX,MASK) \
562 { unsigned char *__tramp = (unsigned char*)(TRAMP); \
563 void* __fun = (void*)(FUN); \
564 void* __ctx = (void*)(CTX); \
565 *(unsigned char*) &__tramp[0] = 0x41; \
566 *(unsigned char*) &__tramp[1] = 0xbb; \
567 *(unsigned int*) &__tramp[2] = MASK; /* mov $mask, %r11 */ \
568 *(unsigned char*) &__tramp[6] = 0x48; \
569 *(unsigned char*) &__tramp[7] = 0xb8; \
570 *(void**) &__tramp[8] = __ctx; /* mov __ctx, %rax */ \
571 *(unsigned char *) &__tramp[16] = 0x49; \
572 *(unsigned char *) &__tramp[17] = 0xba; \
573 *(void**) &__tramp[18] = __fun; /* mov __fun, %r10 */ \
574 *(unsigned char *) &__tramp[26] = 0x41; \
575 *(unsigned char *) &__tramp[27] = 0xff; \
576 *(unsigned char *) &__tramp[28] = 0xe2; /* jmp %r10 */ \
577 }
578
579 /* How to make a trampoline. Derived from gcc/config/i386/i386.c. */
580
581 #define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX) \
582 { unsigned char *__tramp = (unsigned char*)(TRAMP); \
583 unsigned int __fun = (unsigned int)(FUN); \
584 unsigned int __ctx = (unsigned int)(CTX); \
585 unsigned int __dis = __fun - (__ctx + 10); \
586 *(unsigned char*) &__tramp[0] = 0xb8; \
587 *(unsigned int*) &__tramp[1] = __ctx; /* movl __ctx, %eax */ \
588 *(unsigned char *) &__tramp[5] = 0xe9; \
589 *(unsigned int*) &__tramp[6] = __dis; /* jmp __fun */ \
590 }
591
592 #define FFI_INIT_TRAMPOLINE_THISCALL(TRAMP,FUN,CTX,SIZE) \
593 { unsigned char *__tramp = (unsigned char*)(TRAMP); \
594 unsigned int __fun = (unsigned int)(FUN); \
595 unsigned int __ctx = (unsigned int)(CTX); \
596 unsigned int __dis = __fun - (__ctx + 22); \
597 unsigned short __size = (unsigned short)(SIZE); \
598 *(unsigned int *) &__tramp[0] = 0x8324048b; /* mov (%esp), %eax */ \
599 *(unsigned int *) &__tramp[4] = 0x4c890cec; /* sub $12, %esp */ \
600 *(unsigned int *) &__tramp[8] = 0x04890424; /* mov %ecx, 4(%esp) */ \
601 *(unsigned char*) &__tramp[12] = 0x24; /* mov %eax, (%esp) */ \
602 *(unsigned char*) &__tramp[13] = 0xb8; \
603 *(unsigned int *) &__tramp[14] = __size; /* mov __size, %eax */ \
604 *(unsigned int *) &__tramp[18] = 0x08244c8d; /* lea 8(%esp), %ecx */ \
605 *(unsigned int *) &__tramp[22] = 0x4802e8c1; /* shr $2, %eax ; dec %eax */ \
606 *(unsigned short*) &__tramp[26] = 0x0b74; /* jz 1f */ \
607 *(unsigned int *) &__tramp[28] = 0x8908518b; /* 2b: mov 8(%ecx), %edx */ \
608 *(unsigned int *) &__tramp[32] = 0x04c18311; /* mov %edx, (%ecx) ; add $4, %ecx */ \
609 *(unsigned char*) &__tramp[36] = 0x48; /* dec %eax */ \
610 *(unsigned short*) &__tramp[37] = 0xf575; /* jnz 2b ; 1f: */ \
611 *(unsigned char*) &__tramp[39] = 0xb8; \
612 *(unsigned int*) &__tramp[40] = __ctx; /* movl __ctx, %eax */ \
613 *(unsigned char *) &__tramp[44] = 0xe8; \
614 *(unsigned int*) &__tramp[45] = __dis; /* call __fun */ \
615 *(unsigned char*) &__tramp[49] = 0xc2; /* ret */ \
616 *(unsigned short*) &__tramp[50] = (__size + 8); /* ret (__size + 8) */ \
617 }
618
619 #define FFI_INIT_TRAMPOLINE_STDCALL(TRAMP,FUN,CTX,SIZE) \
620 { unsigned char *__tramp = (unsigned char*)(TRAMP); \
621 unsigned int __fun = (unsigned int)(FUN); \
622 unsigned int __ctx = (unsigned int)(CTX); \
623 unsigned int __dis = __fun - (__ctx + 10); \
624 unsigned short __size = (unsigned short)(SIZE); \
625 *(unsigned char*) &__tramp[0] = 0xb8; \
626 *(unsigned int*) &__tramp[1] = __ctx; /* movl __ctx, %eax */ \
627 *(unsigned char *) &__tramp[5] = 0xe8; \
628 *(unsigned int*) &__tramp[6] = __dis; /* call __fun */ \
629 *(unsigned char *) &__tramp[10] = 0xc2; \
630 *(unsigned short*) &__tramp[11] = __size; /* ret __size */ \
631 }
632
633 /* the cif must already be prep'ed */
634
635 ffi_status
636 ffi_prep_closure_loc (ffi_closure* closure,
637 ffi_cif* cif,
638 void (*fun)(ffi_cif*,void*,void**,void*),
639 void *user_data,
640 void *codeloc)
641 {
642 #ifdef X86_WIN64
643 #define ISFLOAT(IDX) (cif->arg_types[IDX]->type == FFI_TYPE_FLOAT || cif->arg_types[IDX]->type == FFI_TYPE_DOUBLE)
644 #define FLAG(IDX) (cif->nargs>(IDX)&&ISFLOAT(IDX)?(1<<(IDX)):0)
645 if (cif->abi == FFI_WIN64)
646 {
647 int mask = FLAG(0)|FLAG(1)|FLAG(2)|FLAG(3);
648 FFI_INIT_TRAMPOLINE_WIN64 (&closure->tramp[0],
649 &ffi_closure_win64,
650 codeloc, mask);
651 /* make sure we can execute here */
652 }
653 #else
654 if (cif->abi == FFI_SYSV)
655 {
656 FFI_INIT_TRAMPOLINE (&closure->tramp[0],
657 &ffi_closure_SYSV,
658 (void*)codeloc);
659 }
660 #ifdef X86_WIN32
661 else if (cif->abi == FFI_THISCALL)
662 {
663 FFI_INIT_TRAMPOLINE_THISCALL (&closure->tramp[0],
664 &ffi_closure_THISCALL,
665 (void*)codeloc,
666 cif->bytes);
667 }
668 else if (cif->abi == FFI_STDCALL)
669 {
670 FFI_INIT_TRAMPOLINE_STDCALL (&closure->tramp[0],
671 &ffi_closure_STDCALL,
672 (void*)codeloc, cif->bytes);
673 }
674 #endif /* X86_WIN32 */
675 #endif /* !X86_WIN64 */
676 else
677 {
678 return FFI_BAD_ABI;
679 }
680
681 closure->cif = cif;
682 closure->user_data = user_data;
683 closure->fun = fun;
684
685 return FFI_OK;
686 }
687
688 /* ------- Native raw API support -------------------------------- */
689
690 #if !FFI_NO_RAW_API
691
692 ffi_status
693 ffi_prep_raw_closure_loc (ffi_raw_closure* closure,
694 ffi_cif* cif,
695 void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
696 void *user_data,
697 void *codeloc)
698 {
699 int i;
700
701 if (cif->abi != FFI_SYSV) {
702 return FFI_BAD_ABI;
703 }
704
705 /* we currently don't support certain kinds of arguments for raw
706 closures. This should be implemented by a separate assembly
707 language routine, since it would require argument processing,
708 something we don't do now for performance. */
709
710 for (i = cif->nargs-1; i >= 0; i--)
711 {
712 FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_STRUCT);
713 FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_LONGDOUBLE);
714 }
715
716
717 FFI_INIT_TRAMPOLINE (&closure->tramp[0], &ffi_closure_raw_SYSV,
718 codeloc);
719
720 closure->cif = cif;
721 closure->user_data = user_data;
722 closure->fun = fun;
723
724 return FFI_OK;
725 }
726
727 static void
728 ffi_prep_args_raw(char *stack, extended_cif *ecif)
729 {
730 memcpy (stack, ecif->avalue, ecif->cif->bytes);
731 }
732
733 /* we borrow this routine from libffi (it must be changed, though, to
734 * actually call the function passed in the first argument. as of
735 * libffi-1.20, this is not the case.)
736 */
737
738 void
739 ffi_raw_call(ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *fake_avalue)
740 {
741 extended_cif ecif;
742 void **avalue = (void **)fake_avalue;
743
744 ecif.cif = cif;
745 ecif.avalue = avalue;
746
747 /* If the return value is a struct and we don't have a return */
748 /* value address then we need to make one */
749
750 if ((rvalue == NULL) &&
751 (cif->rtype->type == FFI_TYPE_STRUCT))
752 {
753 ecif.rvalue = alloca(cif->rtype->size);
754 }
755 else
756 ecif.rvalue = rvalue;
757
758
759 switch (cif->abi)
760 {
761 #ifdef X86_WIN32
762 case FFI_SYSV:
763 case FFI_STDCALL:
764 ffi_call_win32(ffi_prep_args, &ecif, cif->abi, cif->bytes, cif->flags,
765 ecif.rvalue, fn);
766 break;
767 case FFI_THISCALL:
768 case FFI_FASTCALL:
769 {
770 unsigned int abi = cif->abi;
771 unsigned int i, passed_regs = 0;
772
773 if (cif->flags == FFI_TYPE_STRUCT)
774 ++passed_regs;
775
776 for (i=0; i < cif->nargs && passed_regs < 2;i++)
777 {
778 size_t sz;
779
780 if (cif->arg_types[i]->type == FFI_TYPE_FLOAT
781 || cif->arg_types[i]->type == FFI_TYPE_STRUCT)
782 continue;
783 sz = (cif->arg_types[i]->size + 3) & ~3;
784 if (sz == 0 || sz > 4)
785 continue;
786 ++passed_regs;
787 }
788 if (passed_regs < 2 && abi == FFI_FASTCALL)
789 cif->abi = abi = FFI_THISCALL;
790 if (passed_regs < 1 && abi == FFI_THISCALL)
791 cif->abi = abi = FFI_STDCALL;
792 ffi_call_win32(ffi_prep_args, &ecif, abi, cif->bytes, cif->flags,
793 ecif.rvalue, fn);
794 }
795 break;
796 #else
797 case FFI_SYSV:
798 ffi_call_SYSV(ffi_prep_args_raw, &ecif, cif->bytes, cif->flags,
799 ecif.rvalue, fn);
800 break;
801 #endif
802 default:
803 FFI_ASSERT(0);
804 break;
805 }
806 }
807
808 #endif
809
810 #endif /* !__x86_64__ || X86_WIN64 */
811