Text file
src/runtime/sys_linux_amd64.s
Documentation: runtime
1// Copyright 2009 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//
6// System calls and other sys.stuff for AMD64, Linux
7//
8
9#include "go_asm.h"
10#include "go_tls.h"
11#include "textflag.h"
12#include "cgo/abi_amd64.h"
13
14#define AT_FDCWD -100
15
16#define SYS_read 0
17#define SYS_write 1
18#define SYS_close 3
19#define SYS_mmap 9
20#define SYS_munmap 11
21#define SYS_brk 12
22#define SYS_rt_sigaction 13
23#define SYS_rt_sigprocmask 14
24#define SYS_rt_sigreturn 15
25#define SYS_sched_yield 24
26#define SYS_mincore 27
27#define SYS_madvise 28
28#define SYS_nanosleep 35
29#define SYS_setittimer 38
30#define SYS_getpid 39
31#define SYS_socket 41
32#define SYS_connect 42
33#define SYS_clone 56
34#define SYS_exit 60
35#define SYS_kill 62
36#define SYS_sigaltstack 131
37#define SYS_arch_prctl 158
38#define SYS_gettid 186
39#define SYS_futex 202
40#define SYS_sched_getaffinity 204
41#define SYS_timer_create 222
42#define SYS_timer_settime 223
43#define SYS_timer_delete 226
44#define SYS_clock_gettime 228
45#define SYS_exit_group 231
46#define SYS_tgkill 234
47#define SYS_openat 257
48#define SYS_faccessat 269
49#define SYS_pipe2 293
50
51TEXT runtime·exit(SB),NOSPLIT,$0-4
52 MOVL code+0(FP), DI
53 MOVL $SYS_exit_group, AX
54 SYSCALL
55 RET
56
57// func exitThread(wait *atomic.Uint32)
58TEXT runtime·exitThread(SB),NOSPLIT,$0-8
59 MOVQ wait+0(FP), AX
60 // We're done using the stack.
61 MOVL $0, (AX)
62 MOVL $0, DI // exit code
63 MOVL $SYS_exit, AX
64 SYSCALL
65 // We may not even have a stack any more.
66 INT $3
67 JMP 0(PC)
68
69TEXT runtime·open(SB),NOSPLIT,$0-20
70 // This uses openat instead of open, because Android O blocks open.
71 MOVL $AT_FDCWD, DI // AT_FDCWD, so this acts like open
72 MOVQ name+0(FP), SI
73 MOVL mode+8(FP), DX
74 MOVL perm+12(FP), R10
75 MOVL $SYS_openat, AX
76 SYSCALL
77 CMPQ AX, $0xfffffffffffff001
78 JLS 2(PC)
79 MOVL $-1, AX
80 MOVL AX, ret+16(FP)
81 RET
82
83TEXT runtime·closefd(SB),NOSPLIT,$0-12
84 MOVL fd+0(FP), DI
85 MOVL $SYS_close, AX
86 SYSCALL
87 CMPQ AX, $0xfffffffffffff001
88 JLS 2(PC)
89 MOVL $-1, AX
90 MOVL AX, ret+8(FP)
91 RET
92
93TEXT runtime·write1(SB),NOSPLIT,$0-28
94 MOVQ fd+0(FP), DI
95 MOVQ p+8(FP), SI
96 MOVL n+16(FP), DX
97 MOVL $SYS_write, AX
98 SYSCALL
99 MOVL AX, ret+24(FP)
100 RET
101
102TEXT runtime·read(SB),NOSPLIT,$0-28
103 MOVL fd+0(FP), DI
104 MOVQ p+8(FP), SI
105 MOVL n+16(FP), DX
106 MOVL $SYS_read, AX
107 SYSCALL
108 MOVL AX, ret+24(FP)
109 RET
110
111// func pipe2(flags int32) (r, w int32, errno int32)
112TEXT runtime·pipe2(SB),NOSPLIT,$0-20
113 LEAQ r+8(FP), DI
114 MOVL flags+0(FP), SI
115 MOVL $SYS_pipe2, AX
116 SYSCALL
117 MOVL AX, errno+16(FP)
118 RET
119
120TEXT runtime·usleep(SB),NOSPLIT,$16
121 MOVL $0, DX
122 MOVL usec+0(FP), AX
123 MOVL $1000000, CX
124 DIVL CX
125 MOVQ AX, 0(SP)
126 MOVL $1000, AX // usec to nsec
127 MULL DX
128 MOVQ AX, 8(SP)
129
130 // nanosleep(&ts, 0)
131 MOVQ SP, DI
132 MOVL $0, SI
133 MOVL $SYS_nanosleep, AX
134 SYSCALL
135 RET
136
137TEXT runtime·gettid(SB),NOSPLIT,$0-4
138 MOVL $SYS_gettid, AX
139 SYSCALL
140 MOVL AX, ret+0(FP)
141 RET
142
143TEXT runtime·raise(SB),NOSPLIT,$0
144 MOVL $SYS_getpid, AX
145 SYSCALL
146 MOVL AX, R12
147 MOVL $SYS_gettid, AX
148 SYSCALL
149 MOVL AX, SI // arg 2 tid
150 MOVL R12, DI // arg 1 pid
151 MOVL sig+0(FP), DX // arg 3
152 MOVL $SYS_tgkill, AX
153 SYSCALL
154 RET
155
156TEXT runtime·raiseproc(SB),NOSPLIT,$0
157 MOVL $SYS_getpid, AX
158 SYSCALL
159 MOVL AX, DI // arg 1 pid
160 MOVL sig+0(FP), SI // arg 2
161 MOVL $SYS_kill, AX
162 SYSCALL
163 RET
164
165TEXT ·getpid(SB),NOSPLIT,$0-8
166 MOVL $SYS_getpid, AX
167 SYSCALL
168 MOVQ AX, ret+0(FP)
169 RET
170
171TEXT ·tgkill(SB),NOSPLIT,$0
172 MOVQ tgid+0(FP), DI
173 MOVQ tid+8(FP), SI
174 MOVQ sig+16(FP), DX
175 MOVL $SYS_tgkill, AX
176 SYSCALL
177 RET
178
179TEXT runtime·setitimer(SB),NOSPLIT,$0-24
180 MOVL mode+0(FP), DI
181 MOVQ new+8(FP), SI
182 MOVQ old+16(FP), DX
183 MOVL $SYS_setittimer, AX
184 SYSCALL
185 RET
186
187TEXT runtime·timer_create(SB),NOSPLIT,$0-28
188 MOVL clockid+0(FP), DI
189 MOVQ sevp+8(FP), SI
190 MOVQ timerid+16(FP), DX
191 MOVL $SYS_timer_create, AX
192 SYSCALL
193 MOVL AX, ret+24(FP)
194 RET
195
196TEXT runtime·timer_settime(SB),NOSPLIT,$0-28
197 MOVL timerid+0(FP), DI
198 MOVL flags+4(FP), SI
199 MOVQ new+8(FP), DX
200 MOVQ old+16(FP), R10
201 MOVL $SYS_timer_settime, AX
202 SYSCALL
203 MOVL AX, ret+24(FP)
204 RET
205
206TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
207 MOVL timerid+0(FP), DI
208 MOVL $SYS_timer_delete, AX
209 SYSCALL
210 MOVL AX, ret+8(FP)
211 RET
212
213TEXT runtime·mincore(SB),NOSPLIT,$0-28
214 MOVQ addr+0(FP), DI
215 MOVQ n+8(FP), SI
216 MOVQ dst+16(FP), DX
217 MOVL $SYS_mincore, AX
218 SYSCALL
219 MOVL AX, ret+24(FP)
220 RET
221
222// func nanotime1() int64
223TEXT runtime·nanotime1(SB),NOSPLIT,$16-8
224 // We don't know how much stack space the VDSO code will need,
225 // so switch to g0.
226 // In particular, a kernel configured with CONFIG_OPTIMIZE_INLINING=n
227 // and hardening can use a full page of stack space in gettime_sym
228 // due to stack probes inserted to avoid stack/heap collisions.
229 // See issue #20427.
230
231 MOVQ SP, R12 // Save old SP; R12 unchanged by C code.
232
233 MOVQ g_m(R14), BX // BX unchanged by C code.
234
235 // Set vdsoPC and vdsoSP for SIGPROF traceback.
236 // Save the old values on stack and restore them on exit,
237 // so this function is reentrant.
238 MOVQ m_vdsoPC(BX), CX
239 MOVQ m_vdsoSP(BX), DX
240 MOVQ CX, 0(SP)
241 MOVQ DX, 8(SP)
242
243 LEAQ ret+0(FP), DX
244 MOVQ -8(DX), CX
245 MOVQ CX, m_vdsoPC(BX)
246 MOVQ DX, m_vdsoSP(BX)
247
248 CMPQ R14, m_curg(BX) // Only switch if on curg.
249 JNE noswitch
250
251 MOVQ m_g0(BX), DX
252 MOVQ (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack
253
254noswitch:
255 SUBQ $16, SP // Space for results
256 ANDQ $~15, SP // Align for C code
257
258 MOVL $1, DI // CLOCK_MONOTONIC
259 LEAQ 0(SP), SI
260 MOVQ runtime·vdsoClockgettimeSym(SB), AX
261 CMPQ AX, $0
262 JEQ fallback
263 CALL AX
264ret:
265 MOVQ 0(SP), AX // sec
266 MOVQ 8(SP), DX // nsec
267 MOVQ R12, SP // Restore real SP
268 // Restore vdsoPC, vdsoSP
269 // We don't worry about being signaled between the two stores.
270 // If we are not in a signal handler, we'll restore vdsoSP to 0,
271 // and no one will care about vdsoPC. If we are in a signal handler,
272 // we cannot receive another signal.
273 MOVQ 8(SP), CX
274 MOVQ CX, m_vdsoSP(BX)
275 MOVQ 0(SP), CX
276 MOVQ CX, m_vdsoPC(BX)
277 // sec is in AX, nsec in DX
278 // return nsec in AX
279 IMULQ $1000000000, AX
280 ADDQ DX, AX
281 MOVQ AX, ret+0(FP)
282 RET
283fallback:
284 MOVQ $SYS_clock_gettime, AX
285 SYSCALL
286 JMP ret
287
288TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-28
289 MOVL how+0(FP), DI
290 MOVQ new+8(FP), SI
291 MOVQ old+16(FP), DX
292 MOVL size+24(FP), R10
293 MOVL $SYS_rt_sigprocmask, AX
294 SYSCALL
295 CMPQ AX, $0xfffffffffffff001
296 JLS 2(PC)
297 MOVL $0xf1, 0xf1 // crash
298 RET
299
300TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-36
301 MOVQ sig+0(FP), DI
302 MOVQ new+8(FP), SI
303 MOVQ old+16(FP), DX
304 MOVQ size+24(FP), R10
305 MOVL $SYS_rt_sigaction, AX
306 SYSCALL
307 MOVL AX, ret+32(FP)
308 RET
309
310// Call the function stored in _cgo_sigaction using the GCC calling convention.
311TEXT runtime·callCgoSigaction(SB),NOSPLIT,$16
312 MOVQ sig+0(FP), DI
313 MOVQ new+8(FP), SI
314 MOVQ old+16(FP), DX
315 MOVQ _cgo_sigaction(SB), AX
316 MOVQ SP, BX // callee-saved
317 ANDQ $~15, SP // alignment as per amd64 psABI
318 CALL AX
319 MOVQ BX, SP
320 MOVL AX, ret+24(FP)
321 RET
322
323TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
324 MOVQ fn+0(FP), AX
325 MOVL sig+8(FP), DI
326 MOVQ info+16(FP), SI
327 MOVQ ctx+24(FP), DX
328 MOVQ SP, BX // callee-saved
329 ANDQ $~15, SP // alignment for x86_64 ABI
330 CALL AX
331 MOVQ BX, SP
332 RET
333
334// Called using C ABI.
335TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME|NOFRAME,$0
336 // Transition from C ABI to Go ABI.
337 PUSH_REGS_HOST_TO_ABI0()
338
339 // Set up ABIInternal environment: g in R14, cleared X15.
340 get_tls(R12)
341 MOVQ g(R12), R14
342 PXOR X15, X15
343
344 // Reserve space for spill slots.
345 NOP SP // disable vet stack checking
346 ADJSP $24
347
348 // Call into the Go signal handler
349 MOVQ DI, AX // sig
350 MOVQ SI, BX // info
351 MOVQ DX, CX // ctx
352 CALL ·sigtrampgo<ABIInternal>(SB)
353
354 ADJSP $-24
355
356 POP_REGS_HOST_TO_ABI0()
357 RET
358
359// Called using C ABI.
360TEXT runtime·sigprofNonGoWrapper<>(SB),NOSPLIT|NOFRAME,$0
361 // Transition from C ABI to Go ABI.
362 PUSH_REGS_HOST_TO_ABI0()
363
364 // Set up ABIInternal environment: g in R14, cleared X15.
365 get_tls(R12)
366 MOVQ g(R12), R14
367 PXOR X15, X15
368
369 // Reserve space for spill slots.
370 NOP SP // disable vet stack checking
371 ADJSP $24
372
373 // Call into the Go signal handler
374 MOVQ DI, AX // sig
375 MOVQ SI, BX // info
376 MOVQ DX, CX // ctx
377 CALL ·sigprofNonGo<ABIInternal>(SB)
378
379 ADJSP $-24
380
381 POP_REGS_HOST_TO_ABI0()
382 RET
383
384// Used instead of sigtramp in programs that use cgo.
385// Arguments from kernel are in DI, SI, DX.
386TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
387 // If no traceback function, do usual sigtramp.
388 MOVQ runtime·cgoTraceback(SB), AX
389 TESTQ AX, AX
390 JZ sigtramp
391
392 // If no traceback support function, which means that
393 // runtime/cgo was not linked in, do usual sigtramp.
394 MOVQ _cgo_callers(SB), AX
395 TESTQ AX, AX
396 JZ sigtramp
397
398 // Figure out if we are currently in a cgo call.
399 // If not, just do usual sigtramp.
400 get_tls(CX)
401 MOVQ g(CX),AX
402 TESTQ AX, AX
403 JZ sigtrampnog // g == nil
404 MOVQ g_m(AX), AX
405 TESTQ AX, AX
406 JZ sigtramp // g.m == nil
407 MOVL m_ncgo(AX), CX
408 TESTL CX, CX
409 JZ sigtramp // g.m.ncgo == 0
410 MOVQ m_curg(AX), CX
411 TESTQ CX, CX
412 JZ sigtramp // g.m.curg == nil
413 MOVQ g_syscallsp(CX), CX
414 TESTQ CX, CX
415 JZ sigtramp // g.m.curg.syscallsp == 0
416 MOVQ m_cgoCallers(AX), R8
417 TESTQ R8, R8
418 JZ sigtramp // g.m.cgoCallers == nil
419 MOVL m_cgoCallersUse(AX), CX
420 TESTL CX, CX
421 JNZ sigtramp // g.m.cgoCallersUse != 0
422
423 // Jump to a function in runtime/cgo.
424 // That function, written in C, will call the user's traceback
425 // function with proper unwind info, and will then call back here.
426 // The first three arguments, and the fifth, are already in registers.
427 // Set the two remaining arguments now.
428 MOVQ runtime·cgoTraceback(SB), CX
429 MOVQ $runtime·sigtramp(SB), R9
430 MOVQ _cgo_callers(SB), AX
431 JMP AX
432
433sigtramp:
434 JMP runtime·sigtramp(SB)
435
436sigtrampnog:
437 // Signal arrived on a non-Go thread. If this is SIGPROF, get a
438 // stack trace.
439 CMPL DI, $27 // 27 == SIGPROF
440 JNZ sigtramp
441
442 // Lock sigprofCallersUse.
443 MOVL $0, AX
444 MOVL $1, CX
445 MOVQ $runtime·sigprofCallersUse(SB), R11
446 LOCK
447 CMPXCHGL CX, 0(R11)
448 JNZ sigtramp // Skip stack trace if already locked.
449
450 // Jump to the traceback function in runtime/cgo.
451 // It will call back to sigprofNonGo, via sigprofNonGoWrapper, to convert
452 // the arguments to the Go calling convention.
453 // First three arguments to traceback function are in registers already.
454 MOVQ runtime·cgoTraceback(SB), CX
455 MOVQ $runtime·sigprofCallers(SB), R8
456 MOVQ $runtime·sigprofNonGoWrapper<>(SB), R9
457 MOVQ _cgo_callers(SB), AX
458 JMP AX
459
460// For cgo unwinding to work, this function must look precisely like
461// the one in glibc. The glibc source code is:
462// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c;h=afdce87381228f0cf32fa9fa6c8c4efa5179065c#l80
463// The code that cares about the precise instructions used is:
464// https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/config/i386/linux-unwind.h;h=5486223d60272c73d5103b29ae592d2ee998e1cf#l49
465//
466// For gdb unwinding to work, this function must look precisely like the one in
467// glibc and must be named "__restore_rt" or contain the string "sigaction" in
468// the name. The gdb source code is:
469// https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gdb/amd64-linux-tdep.c;h=cbbac1a0c64e1deb8181b9d0ff6404e328e2979d#l178
470TEXT runtime·sigreturn__sigaction(SB),NOSPLIT,$0
471 MOVQ $SYS_rt_sigreturn, AX
472 SYSCALL
473 INT $3 // not reached
474
475TEXT runtime·sysMmap(SB),NOSPLIT,$0
476 MOVQ addr+0(FP), DI
477 MOVQ n+8(FP), SI
478 MOVL prot+16(FP), DX
479 MOVL flags+20(FP), R10
480 MOVL fd+24(FP), R8
481 MOVL off+28(FP), R9
482
483 MOVL $SYS_mmap, AX
484 SYSCALL
485 CMPQ AX, $0xfffffffffffff001
486 JLS ok
487 NOTQ AX
488 INCQ AX
489 MOVQ $0, p+32(FP)
490 MOVQ AX, err+40(FP)
491 RET
492ok:
493 MOVQ AX, p+32(FP)
494 MOVQ $0, err+40(FP)
495 RET
496
497// Call the function stored in _cgo_mmap using the GCC calling convention.
498// This must be called on the system stack.
499TEXT runtime·callCgoMmap(SB),NOSPLIT,$16
500 MOVQ addr+0(FP), DI
501 MOVQ n+8(FP), SI
502 MOVL prot+16(FP), DX
503 MOVL flags+20(FP), CX
504 MOVL fd+24(FP), R8
505 MOVL off+28(FP), R9
506 MOVQ _cgo_mmap(SB), AX
507 MOVQ SP, BX
508 ANDQ $~15, SP // alignment as per amd64 psABI
509 MOVQ BX, 0(SP)
510 CALL AX
511 MOVQ 0(SP), SP
512 MOVQ AX, ret+32(FP)
513 RET
514
515TEXT runtime·sysMunmap(SB),NOSPLIT,$0
516 MOVQ addr+0(FP), DI
517 MOVQ n+8(FP), SI
518 MOVQ $SYS_munmap, AX
519 SYSCALL
520 CMPQ AX, $0xfffffffffffff001
521 JLS 2(PC)
522 MOVL $0xf1, 0xf1 // crash
523 RET
524
525// Call the function stored in _cgo_munmap using the GCC calling convention.
526// This must be called on the system stack.
527TEXT runtime·callCgoMunmap(SB),NOSPLIT,$16-16
528 MOVQ addr+0(FP), DI
529 MOVQ n+8(FP), SI
530 MOVQ _cgo_munmap(SB), AX
531 MOVQ SP, BX
532 ANDQ $~15, SP // alignment as per amd64 psABI
533 MOVQ BX, 0(SP)
534 CALL AX
535 MOVQ 0(SP), SP
536 RET
537
538TEXT runtime·madvise(SB),NOSPLIT,$0
539 MOVQ addr+0(FP), DI
540 MOVQ n+8(FP), SI
541 MOVL flags+16(FP), DX
542 MOVQ $SYS_madvise, AX
543 SYSCALL
544 MOVL AX, ret+24(FP)
545 RET
546
547// int64 futex(int32 *uaddr, int32 op, int32 val,
548// struct timespec *timeout, int32 *uaddr2, int32 val2);
549TEXT runtime·futex(SB),NOSPLIT,$0
550 MOVQ addr+0(FP), DI
551 MOVL op+8(FP), SI
552 MOVL val+12(FP), DX
553 MOVQ ts+16(FP), R10
554 MOVQ addr2+24(FP), R8
555 MOVL val3+32(FP), R9
556 MOVL $SYS_futex, AX
557 SYSCALL
558 MOVL AX, ret+40(FP)
559 RET
560
561// int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
562TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
563 MOVL flags+0(FP), DI
564 MOVQ stk+8(FP), SI
565 MOVQ $0, DX
566 MOVQ $0, R10
567 MOVQ $0, R8
568 // Copy mp, gp, fn off parent stack for use by child.
569 // Careful: Linux system call clobbers CX and R11.
570 MOVQ mp+16(FP), R13
571 MOVQ gp+24(FP), R9
572 MOVQ fn+32(FP), R12
573 CMPQ R13, $0 // m
574 JEQ nog1
575 CMPQ R9, $0 // g
576 JEQ nog1
577 LEAQ m_tls(R13), R8
578#ifdef GOOS_android
579 // Android stores the TLS offset in runtime·tls_g.
580 SUBQ runtime·tls_g(SB), R8
581#else
582 ADDQ $8, R8 // ELF wants to use -8(FS)
583#endif
584 ORQ $0x00080000, DI //add flag CLONE_SETTLS(0x00080000) to call clone
585nog1:
586 MOVL $SYS_clone, AX
587 SYSCALL
588
589 // In parent, return.
590 CMPQ AX, $0
591 JEQ 3(PC)
592 MOVL AX, ret+40(FP)
593 RET
594
595 // In child, on new stack.
596 MOVQ SI, SP
597
598 // If g or m are nil, skip Go-related setup.
599 CMPQ R13, $0 // m
600 JEQ nog2
601 CMPQ R9, $0 // g
602 JEQ nog2
603
604 // Initialize m->procid to Linux tid
605 MOVL $SYS_gettid, AX
606 SYSCALL
607 MOVQ AX, m_procid(R13)
608
609 // In child, set up new stack
610 get_tls(CX)
611 MOVQ R13, g_m(R9)
612 MOVQ R9, g(CX)
613 MOVQ R9, R14 // set g register
614 CALL runtime·stackcheck(SB)
615
616nog2:
617 // Call fn. This is the PC of an ABI0 function.
618 CALL R12
619
620 // It shouldn't return. If it does, exit that thread.
621 MOVL $111, DI
622 MOVL $SYS_exit, AX
623 SYSCALL
624 JMP -3(PC) // keep exiting
625
626TEXT runtime·sigaltstack(SB),NOSPLIT,$0
627 MOVQ new+0(FP), DI
628 MOVQ old+8(FP), SI
629 MOVQ $SYS_sigaltstack, AX
630 SYSCALL
631 CMPQ AX, $0xfffffffffffff001
632 JLS 2(PC)
633 MOVL $0xf1, 0xf1 // crash
634 RET
635
636// set tls base to DI
637TEXT runtime·settls(SB),NOSPLIT,$32
638#ifdef GOOS_android
639 // Android stores the TLS offset in runtime·tls_g.
640 SUBQ runtime·tls_g(SB), DI
641#else
642 ADDQ $8, DI // ELF wants to use -8(FS)
643#endif
644 MOVQ DI, SI
645 MOVQ $0x1002, DI // ARCH_SET_FS
646 MOVQ $SYS_arch_prctl, AX
647 SYSCALL
648 CMPQ AX, $0xfffffffffffff001
649 JLS 2(PC)
650 MOVL $0xf1, 0xf1 // crash
651 RET
652
653TEXT runtime·osyield(SB),NOSPLIT,$0
654 MOVL $SYS_sched_yield, AX
655 SYSCALL
656 RET
657
658TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0
659 MOVQ pid+0(FP), DI
660 MOVQ len+8(FP), SI
661 MOVQ buf+16(FP), DX
662 MOVL $SYS_sched_getaffinity, AX
663 SYSCALL
664 MOVL AX, ret+24(FP)
665 RET
666
667// int access(const char *name, int mode)
668TEXT runtime·access(SB),NOSPLIT,$0
669 // This uses faccessat instead of access, because Android O blocks access.
670 MOVL $AT_FDCWD, DI // AT_FDCWD, so this acts like access
671 MOVQ name+0(FP), SI
672 MOVL mode+8(FP), DX
673 MOVL $0, R10
674 MOVL $SYS_faccessat, AX
675 SYSCALL
676 MOVL AX, ret+16(FP)
677 RET
678
679// int connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
680TEXT runtime·connect(SB),NOSPLIT,$0-28
681 MOVL fd+0(FP), DI
682 MOVQ addr+8(FP), SI
683 MOVL len+16(FP), DX
684 MOVL $SYS_connect, AX
685 SYSCALL
686 MOVL AX, ret+24(FP)
687 RET
688
689// int socket(int domain, int type, int protocol)
690TEXT runtime·socket(SB),NOSPLIT,$0-20
691 MOVL domain+0(FP), DI
692 MOVL typ+4(FP), SI
693 MOVL prot+8(FP), DX
694 MOVL $SYS_socket, AX
695 SYSCALL
696 MOVL AX, ret+16(FP)
697 RET
698
699// func sbrk0() uintptr
700TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
701 // Implemented as brk(NULL).
702 MOVQ $0, DI
703 MOVL $SYS_brk, AX
704 SYSCALL
705 MOVQ AX, ret+0(FP)
706 RET
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