Text file
src/runtime/sys_darwin_arm64.s
Documentation: runtime
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
16TEXT notok<>(SB),NOSPLIT,$0
17 MOVD $0, R8
18 MOVD R8, (R8)
19 B 0(PC)
20
21TEXT 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
31TEXT runtime·close_trampoline(SB),NOSPLIT,$0
32 MOVW 0(R0), R0 // arg 1 fd
33 BL libc_close(SB)
34 RET
35
36TEXT 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
47noerr:
48 RET
49
50TEXT 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
61noerr:
62 RET
63
64TEXT 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
72TEXT 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
79TEXT 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
87TEXT 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
103ok:
104 MOVD R0, 32(R19) // ret 1 p
105 MOVD R1, 40(R19) // ret 2 err
106 RET
107
108TEXT 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
117TEXT 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
124TEXT 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
130TEXT 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
137TEXT runtime·walltime_trampoline(SB),NOSPLIT,$0
138 MOVD R0, R1 // arg 2 timespec
139 MOVW $CLOCK_REALTIME, R0 // arg 1 clock_id
140 BL libc_clock_gettime(SB)
141 RET
142
143GLOBL timebase<>(SB),NOPTR,$(machTimebaseInfo__size)
144
145TEXT 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
166initialized:
167 MOVW R20, 8(R19)
168 MOVW R21, 12(R19)
169 RET
170
171TEXT 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
179TEXT 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
204nog:
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
241TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
242 JMP runtime·sigtramp(SB)
243
244TEXT 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
254TEXT 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
264TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
265 MOVW 0(R0), R0 // arg 1 usec
266 BL libc_usleep(SB)
267 RET
268
269TEXT 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
279TEXT 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
289TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0
290 BL libc_kqueue(SB)
291 RET
292
293TEXT 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
307ok:
308 RET
309
310TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
311 SUB $16, RSP
312 MOVD R0, R19
313 MOVW 0(R19), R0 // arg 1 fd
314 MOVW 4(R19), R1 // arg 2 cmd
315 MOVW 8(R19), R2 // arg 3 arg
316 MOVW R2, (RSP) // arg 3 is variadic, pass on stack
317 BL libc_fcntl(SB)
318 MOVD $0, R1
319 MOVD $-1, R2
320 CMP R0, R2
321 BNE noerr
322 BL libc_error(SB)
323 MOVW (R0), R1
324 MOVW $-1, R0
325noerr:
326 MOVW R0, 12(R19)
327 MOVW R1, 16(R19)
328 ADD $16, RSP
329 RET
330
331TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
332#ifdef GOOS_ios
333 // sigaltstack on iOS is not supported and will always
334 // run the signal handler on the main stack, so our sigtramp has
335 // to do the stack switch ourselves.
336 MOVW $43, R0
337 BL libc_exit(SB)
338#else
339 MOVD 8(R0), R1 // arg 2 old
340 MOVD 0(R0), R0 // arg 1 new
341 CALL libc_sigaltstack(SB)
342 CBZ R0, 2(PC)
343 BL notok<>(SB)
344#endif
345 RET
346
347// Thread related functions
348
349// mstart_stub is the first function executed on a new thread started by pthread_create.
350// It just does some low-level setup and then calls mstart.
351// Note: called with the C calling convention.
352TEXT runtime·mstart_stub(SB),NOSPLIT,$160
353 // R0 points to the m.
354 // We are already on m's g0 stack.
355
356 // Save callee-save registers.
357 SAVE_R19_TO_R28(8)
358 SAVE_F8_TO_F15(88)
359
360 MOVD m_g0(R0), g
361 BL ·save_g(SB)
362
363 BL runtime·mstart(SB)
364
365 // Restore callee-save registers.
366 RESTORE_R19_TO_R28(8)
367 RESTORE_F8_TO_F15(88)
368
369 // Go is all done with this OS thread.
370 // Tell pthread everything is ok (we never join with this thread, so
371 // the value here doesn't really matter).
372 MOVD $0, R0
373
374 RET
375
376TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0
377 MOVD 0(R0), R0 // arg 1 attr
378 BL libc_pthread_attr_init(SB)
379 RET
380
381TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0
382 MOVD 8(R0), R1 // arg 2 size
383 MOVD 0(R0), R0 // arg 1 attr
384 BL libc_pthread_attr_getstacksize(SB)
385 RET
386
387TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
388 MOVD 8(R0), R1 // arg 2 state
389 MOVD 0(R0), R0 // arg 1 attr
390 BL libc_pthread_attr_setdetachstate(SB)
391 RET
392
393TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
394 SUB $16, RSP
395 MOVD 0(R0), R1 // arg 2 state
396 MOVD 8(R0), R2 // arg 3 start
397 MOVD 16(R0), R3 // arg 4 arg
398 MOVD RSP, R0 // arg 1 &threadid (which we throw away)
399 BL libc_pthread_create(SB)
400 ADD $16, RSP
401 RET
402
403TEXT runtime·raise_trampoline(SB),NOSPLIT,$0
404 MOVW 0(R0), R0 // arg 1 sig
405 BL libc_raise(SB)
406 RET
407
408TEXT runtime·pthread_mutex_init_trampoline(SB),NOSPLIT,$0
409 MOVD 8(R0), R1 // arg 2 attr
410 MOVD 0(R0), R0 // arg 1 mutex
411 BL libc_pthread_mutex_init(SB)
412 RET
413
414TEXT runtime·pthread_mutex_lock_trampoline(SB),NOSPLIT,$0
415 MOVD 0(R0), R0 // arg 1 mutex
416 BL libc_pthread_mutex_lock(SB)
417 RET
418
419TEXT runtime·pthread_mutex_unlock_trampoline(SB),NOSPLIT,$0
420 MOVD 0(R0), R0 // arg 1 mutex
421 BL libc_pthread_mutex_unlock(SB)
422 RET
423
424TEXT runtime·pthread_cond_init_trampoline(SB),NOSPLIT,$0
425 MOVD 8(R0), R1 // arg 2 attr
426 MOVD 0(R0), R0 // arg 1 cond
427 BL libc_pthread_cond_init(SB)
428 RET
429
430TEXT runtime·pthread_cond_wait_trampoline(SB),NOSPLIT,$0
431 MOVD 8(R0), R1 // arg 2 mutex
432 MOVD 0(R0), R0 // arg 1 cond
433 BL libc_pthread_cond_wait(SB)
434 RET
435
436TEXT runtime·pthread_cond_timedwait_relative_np_trampoline(SB),NOSPLIT,$0
437 MOVD 8(R0), R1 // arg 2 mutex
438 MOVD 16(R0), R2 // arg 3 timeout
439 MOVD 0(R0), R0 // arg 1 cond
440 BL libc_pthread_cond_timedwait_relative_np(SB)
441 RET
442
443TEXT runtime·pthread_cond_signal_trampoline(SB),NOSPLIT,$0
444 MOVD 0(R0), R0 // arg 1 cond
445 BL libc_pthread_cond_signal(SB)
446 RET
447
448TEXT runtime·pthread_self_trampoline(SB),NOSPLIT,$0
449 MOVD R0, R19 // R19 is callee-save
450 BL libc_pthread_self(SB)
451 MOVD R0, 0(R19) // return value
452 RET
453
454TEXT runtime·pthread_kill_trampoline(SB),NOSPLIT,$0
455 MOVD 8(R0), R1 // arg 2 sig
456 MOVD 0(R0), R0 // arg 1 thread
457 BL libc_pthread_kill(SB)
458 RET
459
460TEXT runtime·pthread_key_create_trampoline(SB),NOSPLIT,$0
461 MOVD 8(R0), R1 // arg 2 destructor
462 MOVD 0(R0), R0 // arg 1 *key
463 BL libc_pthread_key_create(SB)
464 RET
465
466TEXT runtime·pthread_setspecific_trampoline(SB),NOSPLIT,$0
467 MOVD 8(R0), R1 // arg 2 value
468 MOVD 0(R0), R0 // arg 1 key
469 BL libc_pthread_setspecific(SB)
470 RET
471
472TEXT runtime·osinit_hack_trampoline(SB),NOSPLIT,$0
473 MOVD $0, R0 // arg 1 val
474 BL libc_notify_is_valid_token(SB)
475 BL libc_xpc_date_create_from_current(SB)
476 RET
477
478// syscall calls a function in libc on behalf of the syscall package.
479// syscall takes a pointer to a struct like:
480// struct {
481// fn uintptr
482// a1 uintptr
483// a2 uintptr
484// a3 uintptr
485// r1 uintptr
486// r2 uintptr
487// err uintptr
488// }
489// syscall must be called on the g0 stack with the
490// C calling convention (use libcCall).
491TEXT runtime·syscall(SB),NOSPLIT,$0
492 SUB $16, RSP // push structure pointer
493 MOVD R0, 8(RSP)
494
495 MOVD 0(R0), R12 // fn
496 MOVD 16(R0), R1 // a2
497 MOVD 24(R0), R2 // a3
498 MOVD 8(R0), R0 // a1
499
500 // If fn is declared as vararg, we have to pass the vararg arguments on the stack.
501 // (Because ios decided not to adhere to the standard arm64 calling convention, sigh...)
502 // The only libSystem calls we support that are vararg are open, fcntl, and ioctl,
503 // which are all of the form fn(x, y, ...). So we just need to put the 3rd arg
504 // on the stack as well.
505 // If we ever have other vararg libSystem calls, we might need to handle more cases.
506 MOVD R2, (RSP)
507
508 BL (R12)
509
510 MOVD 8(RSP), R2 // pop structure pointer
511 ADD $16, RSP
512 MOVD R0, 32(R2) // save r1
513 MOVD R1, 40(R2) // save r2
514 CMPW $-1, R0
515 BNE ok
516 SUB $16, RSP // push structure pointer
517 MOVD R2, 8(RSP)
518 BL libc_error(SB)
519 MOVW (R0), R0
520 MOVD 8(RSP), R2 // pop structure pointer
521 ADD $16, RSP
522 MOVD R0, 48(R2) // save err
523ok:
524 RET
525
526// syscallX calls a function in libc on behalf of the syscall package.
527// syscallX takes a pointer to a struct like:
528// struct {
529// fn uintptr
530// a1 uintptr
531// a2 uintptr
532// a3 uintptr
533// r1 uintptr
534// r2 uintptr
535// err uintptr
536// }
537// syscallX must be called on the g0 stack with the
538// C calling convention (use libcCall).
539TEXT runtime·syscallX(SB),NOSPLIT,$0
540 SUB $16, RSP // push structure pointer
541 MOVD R0, (RSP)
542
543 MOVD 0(R0), R12 // fn
544 MOVD 16(R0), R1 // a2
545 MOVD 24(R0), R2 // a3
546 MOVD 8(R0), R0 // a1
547 BL (R12)
548
549 MOVD (RSP), R2 // pop structure pointer
550 ADD $16, RSP
551 MOVD R0, 32(R2) // save r1
552 MOVD R1, 40(R2) // save r2
553 CMP $-1, R0
554 BNE ok
555 SUB $16, RSP // push structure pointer
556 MOVD R2, (RSP)
557 BL libc_error(SB)
558 MOVW (R0), R0
559 MOVD (RSP), R2 // pop structure pointer
560 ADD $16, RSP
561 MOVD R0, 48(R2) // save err
562ok:
563 RET
564
565// syscallPtr is like syscallX except that the libc function reports an
566// error by returning NULL and setting errno.
567TEXT runtime·syscallPtr(SB),NOSPLIT,$0
568 SUB $16, RSP // push structure pointer
569 MOVD R0, (RSP)
570
571 MOVD 0(R0), R12 // fn
572 MOVD 16(R0), R1 // a2
573 MOVD 24(R0), R2 // a3
574 MOVD 8(R0), R0 // a1
575 BL (R12)
576
577 MOVD (RSP), R2 // pop structure pointer
578 ADD $16, RSP
579 MOVD R0, 32(R2) // save r1
580 MOVD R1, 40(R2) // save r2
581 CMP $0, R0
582 BNE ok
583 SUB $16, RSP // push structure pointer
584 MOVD R2, (RSP)
585 BL libc_error(SB)
586 MOVW (R0), R0
587 MOVD (RSP), R2 // pop structure pointer
588 ADD $16, RSP
589 MOVD R0, 48(R2) // save err
590ok:
591 RET
592
593// syscall6 calls a function in libc on behalf of the syscall package.
594// syscall6 takes a pointer to a struct like:
595// struct {
596// fn uintptr
597// a1 uintptr
598// a2 uintptr
599// a3 uintptr
600// a4 uintptr
601// a5 uintptr
602// a6 uintptr
603// r1 uintptr
604// r2 uintptr
605// err uintptr
606// }
607// syscall6 must be called on the g0 stack with the
608// C calling convention (use libcCall).
609TEXT runtime·syscall6(SB),NOSPLIT,$0
610 SUB $16, RSP // push structure pointer
611 MOVD R0, 8(RSP)
612
613 MOVD 0(R0), R12 // fn
614 MOVD 16(R0), R1 // a2
615 MOVD 24(R0), R2 // a3
616 MOVD 32(R0), R3 // a4
617 MOVD 40(R0), R4 // a5
618 MOVD 48(R0), R5 // a6
619 MOVD 8(R0), R0 // a1
620
621 // If fn is declared as vararg, we have to pass the vararg arguments on the stack.
622 // See syscall above. The only function this applies to is openat, for which the 4th
623 // arg must be on the stack.
624 MOVD R3, (RSP)
625
626 BL (R12)
627
628 MOVD 8(RSP), R2 // pop structure pointer
629 ADD $16, RSP
630 MOVD R0, 56(R2) // save r1
631 MOVD R1, 64(R2) // save r2
632 CMPW $-1, R0
633 BNE ok
634 SUB $16, RSP // push structure pointer
635 MOVD R2, 8(RSP)
636 BL libc_error(SB)
637 MOVW (R0), R0
638 MOVD 8(RSP), R2 // pop structure pointer
639 ADD $16, RSP
640 MOVD R0, 72(R2) // save err
641ok:
642 RET
643
644// syscall6X calls a function in libc on behalf of the syscall package.
645// syscall6X takes a pointer to a struct like:
646// struct {
647// fn uintptr
648// a1 uintptr
649// a2 uintptr
650// a3 uintptr
651// a4 uintptr
652// a5 uintptr
653// a6 uintptr
654// r1 uintptr
655// r2 uintptr
656// err uintptr
657// }
658// syscall6X must be called on the g0 stack with the
659// C calling convention (use libcCall).
660TEXT runtime·syscall6X(SB),NOSPLIT,$0
661 SUB $16, RSP // push structure pointer
662 MOVD R0, (RSP)
663
664 MOVD 0(R0), R12 // fn
665 MOVD 16(R0), R1 // a2
666 MOVD 24(R0), R2 // a3
667 MOVD 32(R0), R3 // a4
668 MOVD 40(R0), R4 // a5
669 MOVD 48(R0), R5 // a6
670 MOVD 8(R0), R0 // a1
671 BL (R12)
672
673 MOVD (RSP), R2 // pop structure pointer
674 ADD $16, RSP
675 MOVD R0, 56(R2) // save r1
676 MOVD R1, 64(R2) // save r2
677 CMP $-1, R0
678 BNE ok
679 SUB $16, RSP // push structure pointer
680 MOVD R2, (RSP)
681 BL libc_error(SB)
682 MOVW (R0), R0
683 MOVD (RSP), R2 // pop structure pointer
684 ADD $16, RSP
685 MOVD R0, 72(R2) // save err
686ok:
687 RET
688
689// syscall9 calls a function in libc on behalf of the syscall package.
690// syscall9 takes a pointer to a struct like:
691// struct {
692// fn uintptr
693// a1 uintptr
694// a2 uintptr
695// a3 uintptr
696// a4 uintptr
697// a5 uintptr
698// a6 uintptr
699// a7 uintptr
700// a8 uintptr
701// a9 uintptr
702// r1 uintptr
703// r2 uintptr
704// err uintptr
705// }
706// syscall9 must be called on the g0 stack with the
707// C calling convention (use libcCall).
708TEXT runtime·syscall9(SB),NOSPLIT,$0
709 SUB $16, RSP // push structure pointer
710 MOVD R0, 8(RSP)
711
712 MOVD 0(R0), R12 // fn
713 MOVD 16(R0), R1 // a2
714 MOVD 24(R0), R2 // a3
715 MOVD 32(R0), R3 // a4
716 MOVD 40(R0), R4 // a5
717 MOVD 48(R0), R5 // a6
718 MOVD 56(R0), R6 // a7
719 MOVD 64(R0), R7 // a8
720 MOVD 72(R0), R8 // a9
721 MOVD 8(R0), R0 // a1
722
723 // If fn is declared as vararg, we have to pass the vararg arguments on the stack.
724 // See syscall above. The only function this applies to is openat, for which the 4th
725 // arg must be on the stack.
726 MOVD R3, (RSP)
727
728 BL (R12)
729
730 MOVD 8(RSP), R2 // pop structure pointer
731 ADD $16, RSP
732 MOVD R0, 80(R2) // save r1
733 MOVD R1, 88(R2) // save r2
734 CMPW $-1, R0
735 BNE ok
736 SUB $16, RSP // push structure pointer
737 MOVD R2, 8(RSP)
738 BL libc_error(SB)
739 MOVW (R0), R0
740 MOVD 8(RSP), R2 // pop structure pointer
741 ADD $16, RSP
742 MOVD R0, 96(R2) // save err
743ok:
744 RET
745
746// syscall_x509 is for crypto/x509. It is like syscall6 but does not check for errors,
747// takes 5 uintptrs and 1 float64, and only returns one value,
748// for use with standard C ABI functions.
749TEXT runtime·syscall_x509(SB),NOSPLIT,$0
750 SUB $16, RSP // push structure pointer
751 MOVD R0, (RSP)
752
753 MOVD 0(R0), R12 // fn
754 MOVD 16(R0), R1 // a2
755 MOVD 24(R0), R2 // a3
756 MOVD 32(R0), R3 // a4
757 MOVD 40(R0), R4 // a5
758 FMOVD 48(R0), F0 // f1
759 MOVD 8(R0), R0 // a1
760 BL (R12)
761
762 MOVD (RSP), R2 // pop structure pointer
763 ADD $16, RSP
764 MOVD R0, 56(R2) // save r1
765 RET
766
767TEXT runtime·issetugid_trampoline(SB),NOSPLIT,$0
768 BL libc_issetugid(SB)
769 RET
770
771// mach_vm_region_trampoline calls mach_vm_region from libc.
772TEXT runtime·mach_vm_region_trampoline(SB),NOSPLIT,$0
773 MOVD 0(R0), R1 // address
774 MOVD 8(R0), R2 // size
775 MOVW 16(R0), R3 // flavor
776 MOVD 24(R0), R4 // info
777 MOVD 32(R0), R5 // count
778 MOVD 40(R0), R6 // object_name
779 MOVD $libc_mach_task_self_(SB), R0
780 MOVW 0(R0), R0
781 BL libc_mach_vm_region(SB)
782 RET
783
784// proc_regionfilename_trampoline calls proc_regionfilename for
785// the current process.
786TEXT runtime·proc_regionfilename_trampoline(SB),NOSPLIT,$0
787 MOVD 8(R0), R1 // address
788 MOVD 16(R0), R2 // buffer
789 MOVD 24(R0), R3 // buffer_size
790 MOVD 0(R0), R0 // pid
791 BL libc_proc_regionfilename(SB)
792 RET
View as plain text