Text file
src/runtime/sys_netbsd_arm64.s
Documentation: runtime
1// Copyright 2019 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 arm64, NetBSD
7//
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#define CLOCK_MONOTONIC 3
16
17#define SYS_exit 1
18#define SYS_read 3
19#define SYS_write 4
20#define SYS_open 5
21#define SYS_close 6
22#define SYS_getpid 20
23#define SYS_kill 37
24#define SYS_munmap 73
25#define SYS_madvise 75
26#define SYS_fcntl 92
27#define SYS_mmap 197
28#define SYS___sysctl 202
29#define SYS___sigaltstack14 281
30#define SYS___sigprocmask14 293
31#define SYS_issetugid 305
32#define SYS_getcontext 307
33#define SYS_setcontext 308
34#define SYS__lwp_create 309
35#define SYS__lwp_exit 310
36#define SYS__lwp_self 311
37#define SYS__lwp_kill 318
38#define SYS__lwp_unpark 321
39#define SYS___sigaction_sigtramp 340
40#define SYS_kqueue 344
41#define SYS_sched_yield 350
42#define SYS___setitimer50 425
43#define SYS___clock_gettime50 427
44#define SYS___nanosleep50 430
45#define SYS___kevent50 435
46#define SYS_pipe2 453
47#define SYS_openat 468
48#define SYS____lwp_park60 478
49
50// int32 lwp_create(void *context, uintptr flags, void *lwpid)
51TEXT runtime·lwp_create(SB),NOSPLIT,$0
52 MOVD ctxt+0(FP), R0
53 MOVD flags+8(FP), R1
54 MOVD lwpid+16(FP), R2
55 SVC $SYS__lwp_create
56 BCC ok
57 NEG R0, R0
58ok:
59 MOVW R0, ret+24(FP)
60 RET
61
62TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
63 CMP $0, R1
64 BEQ nog
65 CMP $0, R2
66 BEQ nog
67
68 MOVD R0, g_m(R1)
69 MOVD R1, g
70nog:
71 CALL (R2)
72
73 MOVD $0, R0 // crash (not reached)
74 MOVD R0, (R8)
75
76TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
77 CALL ·netbsdMstart0(SB)
78 RET // not reached
79
80TEXT runtime·osyield(SB),NOSPLIT,$0
81 SVC $SYS_sched_yield
82 RET
83
84TEXT runtime·lwp_park(SB),NOSPLIT,$0
85 MOVW clockid+0(FP), R0 // arg 1 - clockid
86 MOVW flags+4(FP), R1 // arg 2 - flags
87 MOVD ts+8(FP), R2 // arg 3 - ts
88 MOVW unpark+16(FP), R3 // arg 4 - unpark
89 MOVD hint+24(FP), R4 // arg 5 - hint
90 MOVD unparkhint+32(FP), R5 // arg 6 - unparkhint
91 SVC $SYS____lwp_park60
92 MOVW R0, ret+40(FP)
93 RET
94
95TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
96 MOVW lwp+0(FP), R0 // arg 1 - lwp
97 MOVD hint+8(FP), R1 // arg 2 - hint
98 SVC $SYS__lwp_unpark
99 MOVW R0, ret+16(FP)
100 RET
101
102TEXT runtime·lwp_self(SB),NOSPLIT,$0
103 SVC $SYS__lwp_self
104 MOVW R0, ret+0(FP)
105 RET
106
107// Exit the entire program (like C exit)
108TEXT runtime·exit(SB),NOSPLIT,$-8
109 MOVW code+0(FP), R0 // arg 1 - exit status
110 SVC $SYS_exit
111 MOVD $0, R0 // If we're still running,
112 MOVD R0, (R0) // crash
113
114// func exitThread(wait *atomic.Uint32)
115TEXT runtime·exitThread(SB),NOSPLIT,$0-8
116 MOVD wait+0(FP), R0
117 // We're done using the stack.
118 MOVW $0, R1
119 STLRW R1, (R0)
120 SVC $SYS__lwp_exit
121 JMP 0(PC)
122
123TEXT runtime·open(SB),NOSPLIT|NOFRAME,$-8
124 MOVD name+0(FP), R0 // arg 1 - pathname
125 MOVW mode+8(FP), R1 // arg 2 - flags
126 MOVW perm+12(FP), R2 // arg 3 - mode
127 SVC $SYS_open
128 BCC ok
129 MOVW $-1, R0
130ok:
131 MOVW R0, ret+16(FP)
132 RET
133
134TEXT runtime·closefd(SB),NOSPLIT,$-8
135 MOVW fd+0(FP), R0 // arg 1 - fd
136 SVC $SYS_close
137 BCC ok
138 MOVW $-1, R0
139ok:
140 MOVW R0, ret+8(FP)
141 RET
142
143TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
144 MOVW fd+0(FP), R0 // arg 1 - fd
145 MOVD p+8(FP), R1 // arg 2 - buf
146 MOVW n+16(FP), R2 // arg 3 - count
147 SVC $SYS_read
148 BCC ok
149 NEG R0, R0
150ok:
151 MOVW R0, ret+24(FP)
152 RET
153
154// func pipe2(flags int32) (r, w int32, errno int32)
155TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
156 ADD $16, RSP, R0
157 MOVW flags+0(FP), R1
158 SVC $SYS_pipe2
159 BCC pipe2ok
160 NEG R0, R0
161pipe2ok:
162 MOVW R0, errno+16(FP)
163 RET
164
165TEXT runtime·write1(SB),NOSPLIT,$-8
166 MOVD fd+0(FP), R0 // arg 1 - fd
167 MOVD p+8(FP), R1 // arg 2 - buf
168 MOVW n+16(FP), R2 // arg 3 - nbyte
169 SVC $SYS_write
170 BCC ok
171 NEG R0, R0
172ok:
173 MOVW R0, ret+24(FP)
174 RET
175
176TEXT runtime·usleep(SB),NOSPLIT,$24-4
177 MOVWU usec+0(FP), R3
178 MOVD R3, R5
179 MOVW $1000000, R4
180 UDIV R4, R3
181 MOVD R3, 8(RSP) // sec
182 MUL R3, R4
183 SUB R4, R5
184 MOVW $1000, R4
185 MUL R4, R5
186 MOVD R5, 16(RSP) // nsec
187
188 MOVD $8(RSP), R0 // arg 1 - rqtp
189 MOVD $0, R1 // arg 2 - rmtp
190 SVC $SYS___nanosleep50
191 RET
192
193TEXT runtime·lwp_kill(SB),NOSPLIT,$0-16
194 MOVW tid+0(FP), R0 // arg 1 - target
195 MOVD sig+8(FP), R1 // arg 2 - signo
196 SVC $SYS__lwp_kill
197 RET
198
199TEXT runtime·raiseproc(SB),NOSPLIT,$16
200 SVC $SYS_getpid
201 // arg 1 - pid (from getpid)
202 MOVD sig+0(FP), R1 // arg 2 - signo
203 SVC $SYS_kill
204 RET
205
206TEXT runtime·setitimer(SB),NOSPLIT,$-8
207 MOVW mode+0(FP), R0 // arg 1 - which
208 MOVD new+8(FP), R1 // arg 2 - itv
209 MOVD old+16(FP), R2 // arg 3 - oitv
210 SVC $SYS___setitimer50
211 RET
212
213// func walltime() (sec int64, nsec int32)
214TEXT runtime·walltime(SB), NOSPLIT, $32
215 MOVW $CLOCK_REALTIME, R0 // arg 1 - clock_id
216 MOVD $8(RSP), R1 // arg 2 - tp
217 SVC $SYS___clock_gettime50
218
219 MOVD 8(RSP), R0 // sec
220 MOVD 16(RSP), R1 // nsec
221
222 // sec is in R0, nsec in R1
223 MOVD R0, sec+0(FP)
224 MOVW R1, nsec+8(FP)
225 RET
226
227// int64 nanotime1(void) so really
228// void nanotime1(int64 *nsec)
229TEXT runtime·nanotime1(SB), NOSPLIT, $32
230 MOVD $CLOCK_MONOTONIC, R0 // arg 1 - clock_id
231 MOVD $8(RSP), R1 // arg 2 - tp
232 SVC $SYS___clock_gettime50
233 MOVD 8(RSP), R0 // sec
234 MOVD 16(RSP), R2 // nsec
235
236 // sec is in R0, nsec in R2
237 // return nsec in R2
238 MOVD $1000000000, R3
239 MUL R3, R0
240 ADD R2, R0
241
242 MOVD R0, ret+0(FP)
243 RET
244
245TEXT runtime·getcontext(SB),NOSPLIT,$-8
246 MOVD ctxt+0(FP), R0 // arg 1 - context
247 SVC $SYS_getcontext
248 BCS fail
249 RET
250fail:
251 MOVD $0, R0
252 MOVD R0, (R0) // crash
253
254TEXT runtime·sigprocmask(SB),NOSPLIT,$0
255 MOVW how+0(FP), R0 // arg 1 - how
256 MOVD new+8(FP), R1 // arg 2 - set
257 MOVD old+16(FP), R2 // arg 3 - oset
258 SVC $SYS___sigprocmask14
259 BCS fail
260 RET
261fail:
262 MOVD $0, R0
263 MOVD R0, (R0) // crash
264
265TEXT sigreturn_tramp<>(SB),NOSPLIT,$-8
266 MOVD g, R0
267 SVC $SYS_setcontext
268 MOVD $0, R0
269 MOVD R0, (R0) // crash
270
271TEXT runtime·sigaction(SB),NOSPLIT,$-8
272 MOVW sig+0(FP), R0 // arg 1 - signum
273 MOVD new+8(FP), R1 // arg 2 - nsa
274 MOVD old+16(FP), R2 // arg 3 - osa
275 // arg 4 - tramp
276 MOVD $sigreturn_tramp<>(SB), R3
277 MOVW $2, R4 // arg 5 - vers
278 SVC $SYS___sigaction_sigtramp
279 BCS fail
280 RET
281fail:
282 MOVD $0, R0
283 MOVD R0, (R0) // crash
284
285// XXX ???
286TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
287 MOVW sig+8(FP), R0
288 MOVD info+16(FP), R1
289 MOVD ctx+24(FP), R2
290 MOVD fn+0(FP), R11
291 BL (R11)
292 RET
293
294TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$176
295 // Save callee-save registers in the case of signal forwarding.
296 // Please refer to https://golang.org/issue/31827 .
297 SAVE_R19_TO_R28(8*4)
298 SAVE_F8_TO_F15(8*14)
299 // Unclobber g for now (kernel uses it as ucontext ptr)
300 // See https://github.com/golang/go/issues/30824#issuecomment-492772426
301 // This is only correct in the non-cgo case.
302 // XXX should use lwp_getprivate as suggested.
303 // 8*36 is ucontext.uc_mcontext.__gregs[_REG_X28]
304 MOVD 8*36(g), g
305
306 // this might be called in external code context,
307 // where g is not set.
308 // first save R0, because runtime·load_g will clobber it
309 MOVD R0, 8(RSP) // signum
310 MOVB runtime·iscgo(SB), R0
311 CMP $0, R0
312 // XXX branch destination
313 BEQ 2(PC)
314 BL runtime·load_g(SB)
315
316 // Restore signum to R0.
317 MOVW 8(RSP), R0
318 // R1 and R2 already contain info and ctx, respectively.
319 BL runtime·sigtrampgo<ABIInternal>(SB)
320
321 // Restore callee-save registers.
322 RESTORE_R19_TO_R28(8*4)
323 RESTORE_F8_TO_F15(8*14)
324
325 RET
326
327TEXT runtime·mmap(SB),NOSPLIT,$0
328 MOVD addr+0(FP), R0 // arg 1 - addr
329 MOVD n+8(FP), R1 // arg 2 - len
330 MOVW prot+16(FP), R2 // arg 3 - prot
331 MOVW flags+20(FP), R3 // arg 4 - flags
332 MOVW fd+24(FP), R4 // arg 5 - fd
333 MOVW $0, R5 // arg 6 - pad
334 MOVD off+28(FP), R6 // arg 7 - offset
335 SVC $SYS_mmap
336 BCS fail
337 MOVD R0, p+32(FP)
338 MOVD $0, err+40(FP)
339 RET
340fail:
341 MOVD $0, p+32(FP)
342 MOVD R0, err+40(FP)
343 RET
344
345TEXT runtime·munmap(SB),NOSPLIT,$0
346 MOVD addr+0(FP), R0 // arg 1 - addr
347 MOVD n+8(FP), R1 // arg 2 - len
348 SVC $SYS_munmap
349 BCS fail
350 RET
351fail:
352 MOVD $0, R0
353 MOVD R0, (R0) // crash
354
355TEXT runtime·madvise(SB),NOSPLIT,$0
356 MOVD addr+0(FP), R0 // arg 1 - addr
357 MOVD n+8(FP), R1 // arg 2 - len
358 MOVW flags+16(FP), R2 // arg 3 - behav
359 SVC $SYS_madvise
360 BCC ok
361 MOVD $-1, R0
362ok:
363 MOVD R0, ret+24(FP)
364 RET
365
366TEXT runtime·sigaltstack(SB),NOSPLIT,$0
367 MOVD new+0(FP), R0 // arg 1 - nss
368 MOVD old+8(FP), R1 // arg 2 - oss
369 SVC $SYS___sigaltstack14
370 BCS fail
371 RET
372fail:
373 MOVD $0, R0
374 MOVD R0, (R0) // crash
375
376TEXT runtime·sysctl(SB),NOSPLIT,$0
377 MOVD mib+0(FP), R0 // arg 1 - name
378 MOVW miblen+8(FP), R1 // arg 2 - namelen
379 MOVD out+16(FP), R2 // arg 3 - oldp
380 MOVD size+24(FP), R3 // arg 4 - oldlenp
381 MOVD dst+32(FP), R4 // arg 5 - newp
382 MOVD ndst+40(FP), R5 // arg 6 - newlen
383 SVC $SYS___sysctl
384 BCC ok
385 NEG R0, R0
386ok:
387 MOVW R0, ret+48(FP)
388 RET
389
390// int32 runtime·kqueue(void)
391TEXT runtime·kqueue(SB),NOSPLIT,$0
392 MOVD $0, R0
393 SVC $SYS_kqueue
394 BCC ok
395 NEG R0, R0
396ok:
397 MOVW R0, ret+0(FP)
398 RET
399
400// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
401TEXT runtime·kevent(SB),NOSPLIT,$0
402 MOVW kq+0(FP), R0 // arg 1 - kq
403 MOVD ch+8(FP), R1 // arg 2 - changelist
404 MOVW nch+16(FP), R2 // arg 3 - nchanges
405 MOVD ev+24(FP), R3 // arg 4 - eventlist
406 MOVW nev+32(FP), R4 // arg 5 - nevents
407 MOVD ts+40(FP), R5 // arg 6 - timeout
408 SVC $SYS___kevent50
409 BCC ok
410 NEG R0, R0
411ok:
412 MOVW R0, ret+48(FP)
413 RET
414
415// func fcntl(fd, cmd, arg int32) (int32, int32)
416TEXT runtime·fcntl(SB),NOSPLIT,$0
417 MOVW fd+0(FP), R0 // fd
418 MOVW cmd+4(FP), R1 // cmd
419 MOVW arg+8(FP), R2 // arg
420 SVC $SYS_fcntl
421 BCC noerr
422 MOVW $-1, R1
423 MOVW R1, ret+16(FP)
424 MOVW R0, errno+20(FP)
425 RET
426noerr:
427 MOVW R0, ret+16(FP)
428 MOVW $0, errno+20(FP)
429 RET
430
431// func issetugid() int32
432TEXT runtime·issetugid(SB),NOSPLIT|NOFRAME,$0
433 SVC $SYS_issetugid
434 MOVW R0, ret+0(FP)
435 RET
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