Text file
src/runtime/sys_netbsd_arm.s
Documentation: runtime
1// Copyright 2013 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 ARM, NetBSD
6// /usr/src/sys/kern/syscalls.master for syscall numbers.
7//
8
9#include "go_asm.h"
10#include "go_tls.h"
11#include "textflag.h"
12
13#define CLOCK_REALTIME 0
14#define CLOCK_MONOTONIC 3
15
16#define SWI_OS_NETBSD 0xa00000
17#define SYS_exit SWI_OS_NETBSD | 1
18#define SYS_read SWI_OS_NETBSD | 3
19#define SYS_write SWI_OS_NETBSD | 4
20#define SYS_open SWI_OS_NETBSD | 5
21#define SYS_close SWI_OS_NETBSD | 6
22#define SYS_getpid SWI_OS_NETBSD | 20
23#define SYS_kill SWI_OS_NETBSD | 37
24#define SYS_munmap SWI_OS_NETBSD | 73
25#define SYS_madvise SWI_OS_NETBSD | 75
26#define SYS_fcntl SWI_OS_NETBSD | 92
27#define SYS_mmap SWI_OS_NETBSD | 197
28#define SYS___sysctl SWI_OS_NETBSD | 202
29#define SYS___sigaltstack14 SWI_OS_NETBSD | 281
30#define SYS___sigprocmask14 SWI_OS_NETBSD | 293
31#define SYS_issetugid SWI_OS_NETBSD | 305
32#define SYS_getcontext SWI_OS_NETBSD | 307
33#define SYS_setcontext SWI_OS_NETBSD | 308
34#define SYS__lwp_create SWI_OS_NETBSD | 309
35#define SYS__lwp_exit SWI_OS_NETBSD | 310
36#define SYS__lwp_self SWI_OS_NETBSD | 311
37#define SYS__lwp_getprivate SWI_OS_NETBSD | 316
38#define SYS__lwp_setprivate SWI_OS_NETBSD | 317
39#define SYS__lwp_kill SWI_OS_NETBSD | 318
40#define SYS__lwp_unpark SWI_OS_NETBSD | 321
41#define SYS___sigaction_sigtramp SWI_OS_NETBSD | 340
42#define SYS_kqueue SWI_OS_NETBSD | 344
43#define SYS_sched_yield SWI_OS_NETBSD | 350
44#define SYS___setitimer50 SWI_OS_NETBSD | 425
45#define SYS___clock_gettime50 SWI_OS_NETBSD | 427
46#define SYS___nanosleep50 SWI_OS_NETBSD | 430
47#define SYS___kevent50 SWI_OS_NETBSD | 435
48#define SYS____lwp_park60 SWI_OS_NETBSD | 478
49
50// Exit the entire program (like C exit)
51TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
52 MOVW code+0(FP), R0 // arg 1 exit status
53 SWI $SYS_exit
54 MOVW.CS $0, R8 // crash on syscall failure
55 MOVW.CS R8, (R8)
56 RET
57
58// func exitThread(wait *atomic.Uint32)
59TEXT runtime·exitThread(SB),NOSPLIT,$0-4
60 MOVW wait+0(FP), R0
61 // We're done using the stack.
62 MOVW $0, R2
63storeloop:
64 LDREX (R0), R4 // loads R4
65 STREX R2, (R0), R1 // stores R2
66 CMP $0, R1
67 BNE storeloop
68 SWI $SYS__lwp_exit
69 MOVW $1, R8 // crash
70 MOVW R8, (R8)
71 JMP 0(PC)
72
73TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
74 MOVW name+0(FP), R0
75 MOVW mode+4(FP), R1
76 MOVW perm+8(FP), R2
77 SWI $SYS_open
78 MOVW.CS $-1, R0
79 MOVW R0, ret+12(FP)
80 RET
81
82TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
83 MOVW fd+0(FP), R0
84 SWI $SYS_close
85 MOVW.CS $-1, R0
86 MOVW R0, ret+4(FP)
87 RET
88
89TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
90 MOVW fd+0(FP), R0
91 MOVW p+4(FP), R1
92 MOVW n+8(FP), R2
93 SWI $SYS_read
94 RSB.CS $0, R0 // caller expects negative errno
95 MOVW R0, ret+12(FP)
96 RET
97
98// func pipe2(flags int32) (r, w int32, errno int32)
99TEXT runtime·pipe2(SB),NOSPLIT,$0-16
100 MOVW $r+4(FP), R0
101 MOVW flags+0(FP), R1
102 SWI $0xa001c5
103 MOVW R0, errno+12(FP)
104 RET
105
106TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
107 MOVW fd+0(FP), R0 // arg 1 - fd
108 MOVW p+4(FP), R1 // arg 2 - buf
109 MOVW n+8(FP), R2 // arg 3 - nbyte
110 SWI $SYS_write
111 RSB.CS $0, R0 // caller expects negative errno
112 MOVW R0, ret+12(FP)
113 RET
114
115// int32 lwp_create(void *context, uintptr flags, void *lwpid)
116TEXT runtime·lwp_create(SB),NOSPLIT,$0
117 MOVW ctxt+0(FP), R0
118 MOVW flags+4(FP), R1
119 MOVW lwpid+8(FP), R2
120 SWI $SYS__lwp_create
121 MOVW R0, ret+12(FP)
122 RET
123
124TEXT runtime·osyield(SB),NOSPLIT,$0
125 SWI $SYS_sched_yield
126 RET
127
128TEXT runtime·lwp_park(SB),NOSPLIT,$8
129 MOVW clockid+0(FP), R0 // arg 1 - clock_id
130 MOVW flags+4(FP), R1 // arg 2 - flags
131 MOVW ts+8(FP), R2 // arg 3 - ts
132 MOVW unpark+12(FP), R3 // arg 4 - unpark
133 MOVW hint+16(FP), R4 // arg 5 - hint
134 MOVW R4, 4(R13)
135 MOVW unparkhint+20(FP), R5 // arg 6 - unparkhint
136 MOVW R5, 8(R13)
137 SWI $SYS____lwp_park60
138 MOVW R0, ret+24(FP)
139 RET
140
141TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
142 MOVW lwp+0(FP), R0 // arg 1 - lwp
143 MOVW hint+4(FP), R1 // arg 2 - hint
144 SWI $SYS__lwp_unpark
145 MOVW R0, ret+8(FP)
146 RET
147
148TEXT runtime·lwp_self(SB),NOSPLIT,$0
149 SWI $SYS__lwp_self
150 MOVW R0, ret+0(FP)
151 RET
152
153TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
154 MOVW R0, g_m(R1)
155 MOVW R1, g
156
157 BL runtime·emptyfunc(SB) // fault if stack check is wrong
158 BL (R2)
159 MOVW $2, R8 // crash (not reached)
160 MOVW R8, (R8)
161 RET
162
163TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
164 BL ·netbsdMstart0(SB)
165 RET // not reached
166
167TEXT runtime·usleep(SB),NOSPLIT,$16
168 MOVW usec+0(FP), R0
169 CALL runtime·usplitR0(SB)
170 // 0(R13) is the saved LR, don't use it
171 MOVW R0, 4(R13) // tv_sec.low
172 MOVW $0, R0
173 MOVW R0, 8(R13) // tv_sec.high
174 MOVW $1000, R2
175 MUL R1, R2
176 MOVW R2, 12(R13) // tv_nsec
177
178 MOVW $4(R13), R0 // arg 1 - rqtp
179 MOVW $0, R1 // arg 2 - rmtp
180 SWI $SYS___nanosleep50
181 RET
182
183TEXT runtime·lwp_kill(SB),NOSPLIT,$0-8
184 MOVW tid+0(FP), R0 // arg 1 - tid
185 MOVW sig+4(FP), R1 // arg 2 - signal
186 SWI $SYS__lwp_kill
187 RET
188
189TEXT runtime·raiseproc(SB),NOSPLIT,$16
190 SWI $SYS_getpid // the returned R0 is arg 1
191 MOVW sig+0(FP), R1 // arg 2 - signal
192 SWI $SYS_kill
193 RET
194
195TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0
196 MOVW mode+0(FP), R0 // arg 1 - which
197 MOVW new+4(FP), R1 // arg 2 - itv
198 MOVW old+8(FP), R2 // arg 3 - oitv
199 SWI $SYS___setitimer50
200 RET
201
202// func walltime() (sec int64, nsec int32)
203TEXT runtime·walltime(SB), NOSPLIT, $32
204 MOVW $0, R0 // CLOCK_REALTIME
205 MOVW $8(R13), R1
206 SWI $SYS___clock_gettime50
207
208 MOVW 8(R13), R0 // sec.low
209 MOVW 12(R13), R1 // sec.high
210 MOVW 16(R13), R2 // nsec
211
212 MOVW R0, sec_lo+0(FP)
213 MOVW R1, sec_hi+4(FP)
214 MOVW R2, nsec+8(FP)
215 RET
216
217// int64 nanotime1(void) so really
218// void nanotime1(int64 *nsec)
219TEXT runtime·nanotime1(SB), NOSPLIT, $32
220 MOVW $3, R0 // CLOCK_MONOTONIC
221 MOVW $8(R13), R1
222 SWI $SYS___clock_gettime50
223
224 MOVW 8(R13), R0 // sec.low
225 MOVW 12(R13), R4 // sec.high
226 MOVW 16(R13), R2 // nsec
227
228 MOVW $1000000000, R3
229 MULLU R0, R3, (R1, R0)
230 MUL R3, R4
231 ADD.S R2, R0
232 ADC R4, R1
233
234 MOVW R0, ret_lo+0(FP)
235 MOVW R1, ret_hi+4(FP)
236 RET
237
238TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0
239 MOVW ctxt+0(FP), R0 // arg 1 - context
240 SWI $SYS_getcontext
241 MOVW.CS $0, R8 // crash on syscall failure
242 MOVW.CS R8, (R8)
243 RET
244
245TEXT runtime·sigprocmask(SB),NOSPLIT,$0
246 MOVW how+0(FP), R0 // arg 1 - how
247 MOVW new+4(FP), R1 // arg 2 - set
248 MOVW old+8(FP), R2 // arg 3 - oset
249 SWI $SYS___sigprocmask14
250 MOVW.CS $0, R8 // crash on syscall failure
251 MOVW.CS R8, (R8)
252 RET
253
254TEXT sigreturn_tramp<>(SB),NOSPLIT|NOFRAME,$0
255 // on entry, SP points to siginfo, we add sizeof(ucontext)
256 // to SP to get a pointer to ucontext.
257 ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT)
258 SWI $SYS_setcontext
259 // something failed, we have to exit
260 MOVW $0x4242, R0 // magic return number
261 SWI $SYS_exit
262 B -2(PC) // continue exit
263
264TEXT runtime·sigaction(SB),NOSPLIT,$4
265 MOVW sig+0(FP), R0 // arg 1 - signum
266 MOVW new+4(FP), R1 // arg 2 - nsa
267 MOVW old+8(FP), R2 // arg 3 - osa
268 MOVW $sigreturn_tramp<>(SB), R3 // arg 4 - tramp
269 MOVW $2, R4 // arg 5 - vers
270 MOVW R4, 4(R13)
271 ADD $4, R13 // pass arg 5 on stack
272 SWI $SYS___sigaction_sigtramp
273 SUB $4, R13
274 MOVW.CS $3, R8 // crash on syscall failure
275 MOVW.CS R8, (R8)
276 RET
277
278TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
279 MOVW sig+4(FP), R0
280 MOVW info+8(FP), R1
281 MOVW ctx+12(FP), R2
282 MOVW fn+0(FP), R11
283 MOVW R13, R4
284 SUB $24, R13
285 BIC $0x7, R13 // alignment for ELF ABI
286 BL (R11)
287 MOVW R4, R13
288 RET
289
290TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0
291 // Reserve space for callee-save registers and arguments.
292 MOVM.DB.W [R4-R11], (R13)
293 SUB $16, R13
294
295 // this might be called in external code context,
296 // where g is not set.
297 // first save R0, because runtime·load_g will clobber it
298 MOVW R0, 4(R13) // signum
299 MOVB runtime·iscgo(SB), R0
300 CMP $0, R0
301 BL.NE runtime·load_g(SB)
302
303 MOVW R1, 8(R13)
304 MOVW R2, 12(R13)
305 BL runtime·sigtrampgo(SB)
306
307 // Restore callee-save registers.
308 ADD $16, R13
309 MOVM.IA.W (R13), [R4-R11]
310
311 RET
312
313TEXT runtime·mmap(SB),NOSPLIT,$12
314 MOVW addr+0(FP), R0 // arg 1 - addr
315 MOVW n+4(FP), R1 // arg 2 - len
316 MOVW prot+8(FP), R2 // arg 3 - prot
317 MOVW flags+12(FP), R3 // arg 4 - flags
318 // arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
319 // note the C runtime only passes the 32-bit offset_lo to us
320 MOVW fd+16(FP), R4 // arg 5
321 MOVW R4, 4(R13)
322 MOVW off+20(FP), R5 // arg 6 lower 32-bit
323 MOVW R5, 8(R13)
324 MOVW $0, R6 // higher 32-bit for arg 6
325 MOVW R6, 12(R13)
326 ADD $4, R13 // pass arg 5 and arg 6 on stack
327 SWI $SYS_mmap
328 SUB $4, R13
329 MOVW $0, R1
330 MOVW.CS R0, R1 // if error, move to R1
331 MOVW.CS $0, R0
332 MOVW R0, p+24(FP)
333 MOVW R1, err+28(FP)
334 RET
335
336TEXT runtime·munmap(SB),NOSPLIT,$0
337 MOVW addr+0(FP), R0 // arg 1 - addr
338 MOVW n+4(FP), R1 // arg 2 - len
339 SWI $SYS_munmap
340 MOVW.CS $0, R8 // crash on syscall failure
341 MOVW.CS R8, (R8)
342 RET
343
344TEXT runtime·madvise(SB),NOSPLIT,$0
345 MOVW addr+0(FP), R0 // arg 1 - addr
346 MOVW n+4(FP), R1 // arg 2 - len
347 MOVW flags+8(FP), R2 // arg 3 - behav
348 SWI $SYS_madvise
349 MOVW.CS $-1, R0
350 MOVW R0, ret+12(FP)
351 RET
352
353TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
354 MOVW new+0(FP), R0 // arg 1 - nss
355 MOVW old+4(FP), R1 // arg 2 - oss
356 SWI $SYS___sigaltstack14
357 MOVW.CS $0, R8 // crash on syscall failure
358 MOVW.CS R8, (R8)
359 RET
360
361TEXT runtime·sysctl(SB),NOSPLIT,$8
362 MOVW mib+0(FP), R0 // arg 1 - name
363 MOVW miblen+4(FP), R1 // arg 2 - namelen
364 MOVW out+8(FP), R2 // arg 3 - oldp
365 MOVW size+12(FP), R3 // arg 4 - oldlenp
366 MOVW dst+16(FP), R4 // arg 5 - newp
367 MOVW R4, 4(R13)
368 MOVW ndst+20(FP), R4 // arg 6 - newlen
369 MOVW R4, 8(R13)
370 ADD $4, R13 // pass arg 5 and 6 on stack
371 SWI $SYS___sysctl
372 SUB $4, R13
373 MOVW R0, ret+24(FP)
374 RET
375
376// int32 runtime·kqueue(void)
377TEXT runtime·kqueue(SB),NOSPLIT,$0
378 SWI $SYS_kqueue
379 RSB.CS $0, R0
380 MOVW R0, ret+0(FP)
381 RET
382
383// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
384TEXT runtime·kevent(SB),NOSPLIT,$8
385 MOVW kq+0(FP), R0 // kq
386 MOVW ch+4(FP), R1 // changelist
387 MOVW nch+8(FP), R2 // nchanges
388 MOVW ev+12(FP), R3 // eventlist
389 MOVW nev+16(FP), R4 // nevents
390 MOVW R4, 4(R13)
391 MOVW ts+20(FP), R4 // timeout
392 MOVW R4, 8(R13)
393 ADD $4, R13 // pass arg 5 and 6 on stack
394 SWI $SYS___kevent50
395 RSB.CS $0, R0
396 SUB $4, R13
397 MOVW R0, ret+24(FP)
398 RET
399
400// func fcntl(fd, cmd, args int32) int32
401TEXT runtime·fcntl(SB),NOSPLIT,$0
402 MOVW fd+0(FP), R0
403 MOVW cmd+4(FP), R1
404 MOVW arg+8(FP), R2
405 SWI $SYS_fcntl
406 MOVW $0, R1
407 MOVW.CS R0, R1
408 MOVW.CS $-1, R0
409 MOVW R0, ret+12(FP)
410 MOVW R1, errno+16(FP)
411 RET
412
413// TODO: this is only valid for ARMv7+
414TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
415 B runtime·armPublicationBarrier(SB)
416
417TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
418 MOVM.WP [R1, R2, R3, R12], (R13)
419 SWI $SYS__lwp_getprivate
420 MOVM.IAW (R13), [R1, R2, R3, R12]
421 RET
422
423// func issetugid() int32
424TEXT runtime·issetugid(SB),NOSPLIT,$0
425 SWI $SYS_issetugid
426 MOVW R0, ret+0(FP)
427 RET
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