Text file
src/runtime/sys_darwin_arm64.s
1 // Copyright 2015 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 // System calls and other sys.stuff for ARM64, Darwin
6 // System calls are implemented in libSystem, this file contains
7 // trampolines that convert from Go to C calling convention.
8
9 #include "go_asm.h"
10 #include "go_tls.h"
11 #include "textflag.h"
12 #include "cgo/abi_arm64.h"
13
14 #define CLOCK_REALTIME 0
15
16 TEXT notok<>(SB),NOSPLIT,$0
17 MOVD $0, R8
18 MOVD R8, (R8)
19 B 0(PC)
20
21 TEXT runtime·open_trampoline(SB),NOSPLIT,$0
22 SUB $16, RSP
23 MOVW 8(R0), R1 // arg 2 flags
24 MOVW 12(R0), R2 // arg 3 mode
25 MOVW R2, (RSP) // arg 3 is variadic, pass on stack
26 MOVD 0(R0), R0 // arg 1 pathname
27 BL libc_open(SB)
28 ADD $16, RSP
29 RET
30
31 TEXT runtime·close_trampoline(SB),NOSPLIT,$0
32 MOVW 0(R0), R0 // arg 1 fd
33 BL libc_close(SB)
34 RET
35
36 TEXT runtime·write_trampoline(SB),NOSPLIT,$0
37 MOVD 8(R0), R1 // arg 2 buf
38 MOVW 16(R0), R2 // arg 3 count
39 MOVW 0(R0), R0 // arg 1 fd
40 BL libc_write(SB)
41 MOVD $-1, R1
42 CMP R0, R1
43 BNE noerr
44 BL libc_error(SB)
45 MOVW (R0), R0
46 NEG R0, R0 // caller expects negative errno value
47 noerr:
48 RET
49
50 TEXT runtime·read_trampoline(SB),NOSPLIT,$0
51 MOVD 8(R0), R1 // arg 2 buf
52 MOVW 16(R0), R2 // arg 3 count
53 MOVW 0(R0), R0 // arg 1 fd
54 BL libc_read(SB)
55 MOVD $-1, R1
56 CMP R0, R1
57 BNE noerr
58 BL libc_error(SB)
59 MOVW (R0), R0
60 NEG R0, R0 // caller expects negative errno value
61 noerr:
62 RET
63
64 TEXT runtime·pipe_trampoline(SB),NOSPLIT,$0
65 BL libc_pipe(SB) // pointer already in R0
66 CMP $0, R0
67 BEQ 3(PC)
68 BL libc_error(SB) // return negative errno value
69 NEG R0, R0
70 RET
71
72 TEXT runtime·exit_trampoline(SB),NOSPLIT|NOFRAME,$0
73 MOVW 0(R0), R0
74 BL libc_exit(SB)
75 MOVD $1234, R0
76 MOVD $1002, R1
77 MOVD R0, (R1) // fail hard
78
79 TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
80 MOVD 0(R0), R19 // signal
81 BL libc_getpid(SB)
82 // arg 1 pid already in R0 from getpid
83 MOVD R19, R1 // arg 2 signal
84 BL libc_kill(SB)
85 RET
86
87 TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
88 MOVD R0, R19
89 MOVD 0(R19), R0 // arg 1 addr
90 MOVD 8(R19), R1 // arg 2 len
91 MOVW 16(R19), R2 // arg 3 prot
92 MOVW 20(R19), R3 // arg 4 flags
93 MOVW 24(R19), R4 // arg 5 fd
94 MOVW 28(R19), R5 // arg 6 off
95 BL libc_mmap(SB)
96 MOVD $0, R1
97 MOVD $-1, R2
98 CMP R0, R2
99 BNE ok
100 BL libc_error(SB)
101 MOVW (R0), R1
102 MOVD $0, R0
103 ok:
104 MOVD R0, 32(R19) // ret 1 p
105 MOVD R1, 40(R19) // ret 2 err
106 RET
107
108 TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0
109 MOVD 8(R0), R1 // arg 2 len
110 MOVD 0(R0), R0 // arg 1 addr
111 BL libc_munmap(SB)
112 CMP $0, R0
113 BEQ 2(PC)
114 BL notok<>(SB)
115 RET
116
117 TEXT runtime·madvise_trampoline(SB),NOSPLIT,$0
118 MOVD 8(R0), R1 // arg 2 len
119 MOVW 16(R0), R2 // arg 3 advice
120 MOVD 0(R0), R0 // arg 1 addr
121 BL libc_madvise(SB)
122 RET
123
124 TEXT runtime·mlock_trampoline(SB),NOSPLIT,$0
125 MOVD 8(R0), R1 // arg 2 len
126 MOVD 0(R0), R0 // arg 1 addr
127 BL libc_mlock(SB)
128 RET
129
130 TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$0
131 MOVD 8(R0), R1 // arg 2 new
132 MOVD 16(R0), R2 // arg 3 old
133 MOVW 0(R0), R0 // arg 1 which
134 BL libc_setitimer(SB)
135 RET
136
137 TEXT runtime·walltime_trampoline(SB),NOSPLIT,$0
138 MOVD R0, R1 // arg 2 timespec
139 MOVW $CLOCK_REALTIME, R0 // arg 1 clock_id
140 BL libc_clock_gettime(SB)
141 RET
142
143 GLOBL timebase<>(SB),NOPTR,$(machTimebaseInfo__size)
144
145 TEXT runtime·nanotime_trampoline(SB),NOSPLIT,$40
146 MOVD R0, R19
147 BL libc_mach_absolute_time(SB)
148 MOVD R0, 0(R19)
149 MOVW timebase<>+machTimebaseInfo_numer(SB), R20
150 MOVD $timebase<>+machTimebaseInfo_denom(SB), R21
151 LDARW (R21), R21 // atomic read
152 CMP $0, R21
153 BNE initialized
154
155 SUB $(machTimebaseInfo__size+15)/16*16, RSP
156 MOVD RSP, R0
157 BL libc_mach_timebase_info(SB)
158 MOVW machTimebaseInfo_numer(RSP), R20
159 MOVW machTimebaseInfo_denom(RSP), R21
160 ADD $(machTimebaseInfo__size+15)/16*16, RSP
161
162 MOVW R20, timebase<>+machTimebaseInfo_numer(SB)
163 MOVD $timebase<>+machTimebaseInfo_denom(SB), R22
164 STLRW R21, (R22) // atomic write
165
166 initialized:
167 MOVW R20, 8(R19)
168 MOVW R21, 12(R19)
169 RET
170
171 TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
172 MOVW sig+8(FP), R0
173 MOVD info+16(FP), R1
174 MOVD ctx+24(FP), R2
175 MOVD fn+0(FP), R11
176 BL (R11)
177 RET
178
179 TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$176
180 // Save callee-save registers in the case of signal forwarding.
181 // Please refer to https://golang.org/issue/31827 .
182 SAVE_R19_TO_R28(8*4)
183 SAVE_F8_TO_F15(8*14)
184
185 // Save arguments.
186 MOVW R0, (8*1)(RSP) // sig
187 MOVD R1, (8*2)(RSP) // info
188 MOVD R2, (8*3)(RSP) // ctx
189
190 // this might be called in external code context,
191 // where g is not set.
192 BL runtime·load_g(SB)
193
194 #ifdef GOOS_ios
195 MOVD RSP, R6
196 CMP $0, g
197 BEQ nog
198 // iOS always use the main stack to run the signal handler.
199 // We need to switch to gsignal ourselves.
200 MOVD g_m(g), R11
201 MOVD m_gsignal(R11), R5
202 MOVD (g_stack+stack_hi)(R5), R6
203
204 nog:
205 // Restore arguments.
206 MOVW (8*1)(RSP), R0
207 MOVD (8*2)(RSP), R1
208 MOVD (8*3)(RSP), R2
209
210 // Reserve space for args and the stack pointer on the
211 // gsignal stack.
212 SUB $48, R6
213 // Save stack pointer.
214 MOVD RSP, R4
215 MOVD R4, (8*4)(R6)
216 // Switch to gsignal stack.
217 MOVD R6, RSP
218
219 // Save arguments.
220 MOVW R0, (8*1)(RSP)
221 MOVD R1, (8*2)(RSP)
222 MOVD R2, (8*3)(RSP)
223 #endif
224
225 // Call sigtrampgo.
226 MOVD $runtime·sigtrampgo(SB), R11
227 BL (R11)
228
229 #ifdef GOOS_ios
230 // Switch to old stack.
231 MOVD (8*4)(RSP), R5
232 MOVD R5, RSP
233 #endif
234
235 // Restore callee-save registers.
236 RESTORE_R19_TO_R28(8*4)
237 RESTORE_F8_TO_F15(8*14)
238
239 RET
240
241 TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
242 JMP runtime·sigtramp(SB)
243
244 TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
245 MOVD 8(R0), R1 // arg 2 new
246 MOVD 16(R0), R2 // arg 3 old
247 MOVW 0(R0), R0 // arg 1 how
248 BL libc_pthread_sigmask(SB)
249 CMP $0, R0
250 BEQ 2(PC)
251 BL notok<>(SB)
252 RET
253
254 TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
255 MOVD 8(R0), R1 // arg 2 new
256 MOVD 16(R0), R2 // arg 3 old
257 MOVW 0(R0), R0 // arg 1 how
258 BL libc_sigaction(SB)
259 CMP $0, R0
260 BEQ 2(PC)
261 BL notok<>(SB)
262 RET
263
264 TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
265 MOVW 0(R0), R0 // arg 1 usec
266 BL libc_usleep(SB)
267 RET
268
269 TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
270 MOVW 8(R0), R1 // arg 2 miblen
271 MOVD 16(R0), R2 // arg 3 oldp
272 MOVD 24(R0), R3 // arg 4 oldlenp
273 MOVD 32(R0), R4 // arg 5 newp
274 MOVD 40(R0), R5 // arg 6 newlen
275 MOVD 0(R0), R0 // arg 1 mib
276 BL libc_sysctl(SB)
277 RET
278
279 TEXT runtime·sysctlbyname_trampoline(SB),NOSPLIT,$0
280 MOVD 8(R0), R1 // arg 2 oldp
281 MOVD 16(R0), R2 // arg 3 oldlenp
282 MOVD 24(R0), R3 // arg 4 newp
283 MOVD 32(R0), R4 // arg 5 newlen
284 MOVD 0(R0), R0 // arg 1 name
285 BL libc_sysctlbyname(SB)
286 RET
287
288
289 TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0
290 BL libc_kqueue(SB)
291 RET
292
293 TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
294 MOVD 8(R0), R1 // arg 2 keventt
295 MOVW 16(R0), R2 // arg 3 nch
296 MOVD 24(R0), R3 // arg 4 ev
297 MOVW 32(R0), R4 // arg 5 nev
298 MOVD 40(R0), R5 // arg 6 ts
299 MOVW 0(R0), R0 // arg 1 kq
300 BL libc_kevent(SB)
301 MOVD $-1, R2
302 CMP R0, R2
303 BNE ok
304 BL libc_error(SB)
305 MOVW (R0), R0 // errno
306 NEG R0, R0 // caller wants it as a negative error code
307 ok:
308 RET
309
310 TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
311 SUB $16, RSP
312 MOVW 4(R0), R1 // arg 2 cmd
313 MOVW 8(R0), R2 // arg 3 arg
314 MOVW R2, (RSP) // arg 3 is variadic, pass on stack
315 MOVW 0(R0), R0 // arg 1 fd
316 BL libc_fcntl(SB)
317 ADD $16, RSP
318 RET
319
320 TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
321 #ifdef GOOS_ios
322 // sigaltstack on iOS is not supported and will always
323 // run the signal handler on the main stack, so our sigtramp has
324 // to do the stack switch ourselves.
325 MOVW $43, R0
326 BL libc_exit(SB)
327 #else
328 MOVD 8(R0), R1 // arg 2 old
329 MOVD 0(R0), R0 // arg 1 new
330 CALL libc_sigaltstack(SB)
331 CBZ R0, 2(PC)
332 BL notok<>(SB)
333 #endif
334 RET
335
336 // Thread related functions
337
338 // mstart_stub is the first function executed on a new thread started by pthread_create.
339 // It just does some low-level setup and then calls mstart.
340 // Note: called with the C calling convention.
341 TEXT runtime·mstart_stub(SB),NOSPLIT,$160
342 // R0 points to the m.
343 // We are already on m's g0 stack.
344
345 // Save callee-save registers.
346 SAVE_R19_TO_R28(8)
347 SAVE_F8_TO_F15(88)
348
349 MOVD m_g0(R0), g
350 BL ·save_g(SB)
351
352 BL runtime·mstart(SB)
353
354 // Restore callee-save registers.
355 RESTORE_R19_TO_R28(8)
356 RESTORE_F8_TO_F15(88)
357
358 // Go is all done with this OS thread.
359 // Tell pthread everything is ok (we never join with this thread, so
360 // the value here doesn't really matter).
361 MOVD $0, R0
362
363 RET
364
365 TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0
366 MOVD 0(R0), R0 // arg 1 attr
367 BL libc_pthread_attr_init(SB)
368 RET
369
370 TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0
371 MOVD 8(R0), R1 // arg 2 size
372 MOVD 0(R0), R0 // arg 1 attr
373 BL libc_pthread_attr_getstacksize(SB)
374 RET
375
376 TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
377 MOVD 8(R0), R1 // arg 2 state
378 MOVD 0(R0), R0 // arg 1 attr
379 BL libc_pthread_attr_setdetachstate(SB)
380 RET
381
382 TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
383 SUB $16, RSP
384 MOVD 0(R0), R1 // arg 2 state
385 MOVD 8(R0), R2 // arg 3 start
386 MOVD 16(R0), R3 // arg 4 arg
387 MOVD RSP, R0 // arg 1 &threadid (which we throw away)
388 BL libc_pthread_create(SB)
389 ADD $16, RSP
390 RET
391
392 TEXT runtime·raise_trampoline(SB),NOSPLIT,$0
393 MOVW 0(R0), R0 // arg 1 sig
394 BL libc_raise(SB)
395 RET
396
397 TEXT runtime·pthread_mutex_init_trampoline(SB),NOSPLIT,$0
398 MOVD 8(R0), R1 // arg 2 attr
399 MOVD 0(R0), R0 // arg 1 mutex
400 BL libc_pthread_mutex_init(SB)
401 RET
402
403 TEXT runtime·pthread_mutex_lock_trampoline(SB),NOSPLIT,$0
404 MOVD 0(R0), R0 // arg 1 mutex
405 BL libc_pthread_mutex_lock(SB)
406 RET
407
408 TEXT runtime·pthread_mutex_unlock_trampoline(SB),NOSPLIT,$0
409 MOVD 0(R0), R0 // arg 1 mutex
410 BL libc_pthread_mutex_unlock(SB)
411 RET
412
413 TEXT runtime·pthread_cond_init_trampoline(SB),NOSPLIT,$0
414 MOVD 8(R0), R1 // arg 2 attr
415 MOVD 0(R0), R0 // arg 1 cond
416 BL libc_pthread_cond_init(SB)
417 RET
418
419 TEXT runtime·pthread_cond_wait_trampoline(SB),NOSPLIT,$0
420 MOVD 8(R0), R1 // arg 2 mutex
421 MOVD 0(R0), R0 // arg 1 cond
422 BL libc_pthread_cond_wait(SB)
423 RET
424
425 TEXT runtime·pthread_cond_timedwait_relative_np_trampoline(SB),NOSPLIT,$0
426 MOVD 8(R0), R1 // arg 2 mutex
427 MOVD 16(R0), R2 // arg 3 timeout
428 MOVD 0(R0), R0 // arg 1 cond
429 BL libc_pthread_cond_timedwait_relative_np(SB)
430 RET
431
432 TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0
433 MOVD 0(R0), R0 // arg 1 cond
434 BL libc_pthread_cond_signal(SB)
435 RET
436
437 TEXT runtime·pthread_self_trampoline(SB),NOSPLIT,$0
438 MOVD R0, R19 // R19 is callee-save
439 BL libc_pthread_self(SB)
440 MOVD R0, 0(R19) // return value
441 RET
442
443 TEXT runtime·pthread_kill_trampoline(SB),NOSPLIT,$0
444 MOVD 8(R0), R1 // arg 2 sig
445 MOVD 0(R0), R0 // arg 1 thread
446 BL libc_pthread_kill(SB)
447 RET
448
449 TEXT runtime·pthread_key_create_trampoline(SB),NOSPLIT,$0
450 MOVD 8(R0), R1 // arg 2 destructor
451 MOVD 0(R0), R0 // arg 1 *key
452 BL libc_pthread_key_create(SB)
453 RET
454
455 TEXT runtime·pthread_setspecific_trampoline(SB),NOSPLIT,$0
456 MOVD 8(R0), R1 // arg 2 value
457 MOVD 0(R0), R0 // arg 1 key
458 BL libc_pthread_setspecific(SB)
459 RET
460
461 // syscall calls a function in libc on behalf of the syscall package.
462 // syscall takes a pointer to a struct like:
463 // struct {
464 // fn uintptr
465 // a1 uintptr
466 // a2 uintptr
467 // a3 uintptr
468 // r1 uintptr
469 // r2 uintptr
470 // err uintptr
471 // }
472 // syscall must be called on the g0 stack with the
473 // C calling convention (use libcCall).
474 TEXT runtime·syscall(SB),NOSPLIT,$0
475 SUB $16, RSP // push structure pointer
476 MOVD R0, 8(RSP)
477
478 MOVD 0(R0), R12 // fn
479 MOVD 16(R0), R1 // a2
480 MOVD 24(R0), R2 // a3
481 MOVD 8(R0), R0 // a1
482
483 // If fn is declared as vararg, we have to pass the vararg arguments on the stack.
484 // (Because ios decided not to adhere to the standard arm64 calling convention, sigh...)
485 // The only libSystem calls we support that are vararg are open, fcntl, and ioctl,
486 // which are all of the form fn(x, y, ...). So we just need to put the 3rd arg
487 // on the stack as well.
488 // If we ever have other vararg libSystem calls, we might need to handle more cases.
489 MOVD R2, (RSP)
490
491 BL (R12)
492
493 MOVD 8(RSP), R2 // pop structure pointer
494 ADD $16, RSP
495 MOVD R0, 32(R2) // save r1
496 MOVD R1, 40(R2) // save r2
497 CMPW $-1, R0
498 BNE ok
499 SUB $16, RSP // push structure pointer
500 MOVD R2, 8(RSP)
501 BL libc_error(SB)
502 MOVW (R0), R0
503 MOVD 8(RSP), R2 // pop structure pointer
504 ADD $16, RSP
505 MOVD R0, 48(R2) // save err
506 ok:
507 RET
508
509 // syscallX calls a function in libc on behalf of the syscall package.
510 // syscallX takes a pointer to a struct like:
511 // struct {
512 // fn uintptr
513 // a1 uintptr
514 // a2 uintptr
515 // a3 uintptr
516 // r1 uintptr
517 // r2 uintptr
518 // err uintptr
519 // }
520 // syscallX must be called on the g0 stack with the
521 // C calling convention (use libcCall).
522 TEXT runtime·syscallX(SB),NOSPLIT,$0
523 SUB $16, RSP // push structure pointer
524 MOVD R0, (RSP)
525
526 MOVD 0(R0), R12 // fn
527 MOVD 16(R0), R1 // a2
528 MOVD 24(R0), R2 // a3
529 MOVD 8(R0), R0 // a1
530 BL (R12)
531
532 MOVD (RSP), R2 // pop structure pointer
533 ADD $16, RSP
534 MOVD R0, 32(R2) // save r1
535 MOVD R1, 40(R2) // save r2
536 CMP $-1, R0
537 BNE ok
538 SUB $16, RSP // push structure pointer
539 MOVD R2, (RSP)
540 BL libc_error(SB)
541 MOVW (R0), R0
542 MOVD (RSP), R2 // pop structure pointer
543 ADD $16, RSP
544 MOVD R0, 48(R2) // save err
545 ok:
546 RET
547
548 // syscallPtr is like syscallX except that the libc function reports an
549 // error by returning NULL and setting errno.
550 TEXT runtime·syscallPtr(SB),NOSPLIT,$0
551 SUB $16, RSP // push structure pointer
552 MOVD R0, (RSP)
553
554 MOVD 0(R0), R12 // fn
555 MOVD 16(R0), R1 // a2
556 MOVD 24(R0), R2 // a3
557 MOVD 8(R0), R0 // a1
558 BL (R12)
559
560 MOVD (RSP), R2 // pop structure pointer
561 ADD $16, RSP
562 MOVD R0, 32(R2) // save r1
563 MOVD R1, 40(R2) // save r2
564 CMP $0, R0
565 BNE ok
566 SUB $16, RSP // push structure pointer
567 MOVD R2, (RSP)
568 BL libc_error(SB)
569 MOVW (R0), R0
570 MOVD (RSP), R2 // pop structure pointer
571 ADD $16, RSP
572 MOVD R0, 48(R2) // save err
573 ok:
574 RET
575
576 // syscall6 calls a function in libc on behalf of the syscall package.
577 // syscall6 takes a pointer to a struct like:
578 // struct {
579 // fn uintptr
580 // a1 uintptr
581 // a2 uintptr
582 // a3 uintptr
583 // a4 uintptr
584 // a5 uintptr
585 // a6 uintptr
586 // r1 uintptr
587 // r2 uintptr
588 // err uintptr
589 // }
590 // syscall6 must be called on the g0 stack with the
591 // C calling convention (use libcCall).
592 TEXT runtime·syscall6(SB),NOSPLIT,$0
593 SUB $16, RSP // push structure pointer
594 MOVD R0, 8(RSP)
595
596 MOVD 0(R0), R12 // fn
597 MOVD 16(R0), R1 // a2
598 MOVD 24(R0), R2 // a3
599 MOVD 32(R0), R3 // a4
600 MOVD 40(R0), R4 // a5
601 MOVD 48(R0), R5 // a6
602 MOVD 8(R0), R0 // a1
603
604 // If fn is declared as vararg, we have to pass the vararg arguments on the stack.
605 // See syscall above. The only function this applies to is openat, for which the 4th
606 // arg must be on the stack.
607 MOVD R3, (RSP)
608
609 BL (R12)
610
611 MOVD 8(RSP), R2 // pop structure pointer
612 ADD $16, RSP
613 MOVD R0, 56(R2) // save r1
614 MOVD R1, 64(R2) // save r2
615 CMPW $-1, R0
616 BNE ok
617 SUB $16, RSP // push structure pointer
618 MOVD R2, 8(RSP)
619 BL libc_error(SB)
620 MOVW (R0), R0
621 MOVD 8(RSP), R2 // pop structure pointer
622 ADD $16, RSP
623 MOVD R0, 72(R2) // save err
624 ok:
625 RET
626
627 // syscall6X calls a function in libc on behalf of the syscall package.
628 // syscall6X takes a pointer to a struct like:
629 // struct {
630 // fn uintptr
631 // a1 uintptr
632 // a2 uintptr
633 // a3 uintptr
634 // a4 uintptr
635 // a5 uintptr
636 // a6 uintptr
637 // r1 uintptr
638 // r2 uintptr
639 // err uintptr
640 // }
641 // syscall6X must be called on the g0 stack with the
642 // C calling convention (use libcCall).
643 TEXT runtime·syscall6X(SB),NOSPLIT,$0
644 SUB $16, RSP // push structure pointer
645 MOVD R0, (RSP)
646
647 MOVD 0(R0), R12 // fn
648 MOVD 16(R0), R1 // a2
649 MOVD 24(R0), R2 // a3
650 MOVD 32(R0), R3 // a4
651 MOVD 40(R0), R4 // a5
652 MOVD 48(R0), R5 // a6
653 MOVD 8(R0), R0 // a1
654 BL (R12)
655
656 MOVD (RSP), R2 // pop structure pointer
657 ADD $16, RSP
658 MOVD R0, 56(R2) // save r1
659 MOVD R1, 64(R2) // save r2
660 CMP $-1, R0
661 BNE ok
662 SUB $16, RSP // push structure pointer
663 MOVD R2, (RSP)
664 BL libc_error(SB)
665 MOVW (R0), R0
666 MOVD (RSP), R2 // pop structure pointer
667 ADD $16, RSP
668 MOVD R0, 72(R2) // save err
669 ok:
670 RET
671
672 // syscall_x509 is for crypto/x509. It is like syscall6 but does not check for errors,
673 // takes 5 uintptrs and 1 float64, and only returns one value,
674 // for use with standard C ABI functions.
675 TEXT runtime·syscall_x509(SB),NOSPLIT,$0
676 SUB $16, RSP // push structure pointer
677 MOVD R0, (RSP)
678
679 MOVD 0(R0), R12 // fn
680 MOVD 16(R0), R1 // a2
681 MOVD 24(R0), R2 // a3
682 MOVD 32(R0), R3 // a4
683 MOVD 40(R0), R4 // a5
684 FMOVD 48(R0), F0 // f1
685 MOVD 8(R0), R0 // a1
686 BL (R12)
687
688 MOVD (RSP), R2 // pop structure pointer
689 ADD $16, RSP
690 MOVD R0, 56(R2) // save r1
691 RET
692
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