Text file
src/runtime/sys_freebsd_arm.s
Documentation: runtime
1// Copyright 2012 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, FreeBSD
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// for EABI, as we don't support OABI
14#define SYS_BASE 0x0
15
16#define SYS_exit (SYS_BASE + 1)
17#define SYS_read (SYS_BASE + 3)
18#define SYS_write (SYS_BASE + 4)
19#define SYS_open (SYS_BASE + 5)
20#define SYS_close (SYS_BASE + 6)
21#define SYS_getpid (SYS_BASE + 20)
22#define SYS_kill (SYS_BASE + 37)
23#define SYS_sigaltstack (SYS_BASE + 53)
24#define SYS_munmap (SYS_BASE + 73)
25#define SYS_madvise (SYS_BASE + 75)
26#define SYS_setitimer (SYS_BASE + 83)
27#define SYS_fcntl (SYS_BASE + 92)
28#define SYS___sysctl (SYS_BASE + 202)
29#define SYS_nanosleep (SYS_BASE + 240)
30#define SYS_issetugid (SYS_BASE + 253)
31#define SYS_clock_gettime (SYS_BASE + 232)
32#define SYS_sched_yield (SYS_BASE + 331)
33#define SYS_sigprocmask (SYS_BASE + 340)
34#define SYS_kqueue (SYS_BASE + 362)
35#define SYS_sigaction (SYS_BASE + 416)
36#define SYS_thr_exit (SYS_BASE + 431)
37#define SYS_thr_self (SYS_BASE + 432)
38#define SYS_thr_kill (SYS_BASE + 433)
39#define SYS__umtx_op (SYS_BASE + 454)
40#define SYS_thr_new (SYS_BASE + 455)
41#define SYS_mmap (SYS_BASE + 477)
42#define SYS_cpuset_getaffinity (SYS_BASE + 487)
43#define SYS_pipe2 (SYS_BASE + 542)
44#define SYS_kevent (SYS_BASE + 560)
45
46TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
47 MOVW addr+0(FP), R0
48 MOVW mode+4(FP), R1
49 MOVW val+8(FP), R2
50 MOVW uaddr1+12(FP), R3
51 ADD $20, R13 // arg 5 is passed on stack
52 MOVW $SYS__umtx_op, R7
53 SWI $0
54 RSB.CS $0, R0
55 SUB $20, R13
56 // BCS error
57 MOVW R0, ret+20(FP)
58 RET
59
60TEXT runtime·thr_new(SB),NOSPLIT,$0
61 MOVW param+0(FP), R0
62 MOVW size+4(FP), R1
63 MOVW $SYS_thr_new, R7
64 SWI $0
65 RSB.CS $0, R0
66 MOVW R0, ret+8(FP)
67 RET
68
69TEXT runtime·thr_start(SB),NOSPLIT,$0
70 // set up g
71 MOVW m_g0(R0), g
72 MOVW R0, g_m(g)
73 BL runtime·emptyfunc(SB) // fault if stack check is wrong
74 BL runtime·mstart(SB)
75
76 MOVW $2, R8 // crash (not reached)
77 MOVW R8, (R8)
78 RET
79
80// Exit the entire program (like C exit)
81TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
82 MOVW code+0(FP), R0 // arg 1 exit status
83 MOVW $SYS_exit, R7
84 SWI $0
85 MOVW.CS $0, R8 // crash on syscall failure
86 MOVW.CS R8, (R8)
87 RET
88
89// func exitThread(wait *atomic.Uint32)
90TEXT runtime·exitThread(SB),NOSPLIT,$0-4
91 MOVW wait+0(FP), R0
92 // We're done using the stack.
93 MOVW $0, R2
94storeloop:
95 LDREX (R0), R4 // loads R4
96 STREX R2, (R0), R1 // stores R2
97 CMP $0, R1
98 BNE storeloop
99 MOVW $0, R0 // arg 1 long *state
100 MOVW $SYS_thr_exit, R7
101 SWI $0
102 MOVW.CS $0, R8 // crash on syscall failure
103 MOVW.CS R8, (R8)
104 JMP 0(PC)
105
106TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
107 MOVW name+0(FP), R0 // arg 1 name
108 MOVW mode+4(FP), R1 // arg 2 mode
109 MOVW perm+8(FP), R2 // arg 3 perm
110 MOVW $SYS_open, R7
111 SWI $0
112 MOVW.CS $-1, R0
113 MOVW R0, ret+12(FP)
114 RET
115
116TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
117 MOVW fd+0(FP), R0 // arg 1 fd
118 MOVW p+4(FP), R1 // arg 2 buf
119 MOVW n+8(FP), R2 // arg 3 count
120 MOVW $SYS_read, R7
121 SWI $0
122 RSB.CS $0, R0 // caller expects negative errno
123 MOVW R0, ret+12(FP)
124 RET
125
126// func pipe2(flags int32) (r, w int32, errno int32)
127TEXT runtime·pipe2(SB),NOSPLIT,$0-16
128 MOVW $r+4(FP), R0
129 MOVW flags+0(FP), R1
130 MOVW $SYS_pipe2, R7
131 SWI $0
132 RSB.CS $0, R0
133 MOVW R0, errno+12(FP)
134 RET
135
136TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
137 MOVW fd+0(FP), R0 // arg 1 fd
138 MOVW p+4(FP), R1 // arg 2 buf
139 MOVW n+8(FP), R2 // arg 3 count
140 MOVW $SYS_write, R7
141 SWI $0
142 RSB.CS $0, R0 // caller expects negative errno
143 MOVW R0, ret+12(FP)
144 RET
145
146TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
147 MOVW fd+0(FP), R0 // arg 1 fd
148 MOVW $SYS_close, R7
149 SWI $0
150 MOVW.CS $-1, R0
151 MOVW R0, ret+4(FP)
152 RET
153
154TEXT runtime·thr_self(SB),NOSPLIT,$0-4
155 // thr_self(&0(FP))
156 MOVW $ret+0(FP), R0 // arg 1
157 MOVW $SYS_thr_self, R7
158 SWI $0
159 RET
160
161TEXT runtime·thr_kill(SB),NOSPLIT,$0-8
162 // thr_kill(tid, sig)
163 MOVW tid+0(FP), R0 // arg 1 id
164 MOVW sig+4(FP), R1 // arg 2 signal
165 MOVW $SYS_thr_kill, R7
166 SWI $0
167 RET
168
169TEXT runtime·raiseproc(SB),NOSPLIT,$0
170 // getpid
171 MOVW $SYS_getpid, R7
172 SWI $0
173 // kill(self, sig)
174 // arg 1 - pid, now in R0
175 MOVW sig+0(FP), R1 // arg 2 - signal
176 MOVW $SYS_kill, R7
177 SWI $0
178 RET
179
180TEXT runtime·setitimer(SB), NOSPLIT|NOFRAME, $0
181 MOVW mode+0(FP), R0
182 MOVW new+4(FP), R1
183 MOVW old+8(FP), R2
184 MOVW $SYS_setitimer, R7
185 SWI $0
186 RET
187
188// func fallback_walltime() (sec int64, nsec int32)
189TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12
190 MOVW $0, R0 // CLOCK_REALTIME
191 MOVW $8(R13), R1
192 MOVW $SYS_clock_gettime, R7
193 SWI $0
194
195 MOVW 8(R13), R0 // sec.low
196 MOVW 12(R13), R1 // sec.high
197 MOVW 16(R13), R2 // nsec
198
199 MOVW R0, sec_lo+0(FP)
200 MOVW R1, sec_hi+4(FP)
201 MOVW R2, nsec+8(FP)
202 RET
203
204// func fallback_nanotime() int64
205TEXT runtime·fallback_nanotime(SB), NOSPLIT, $32
206 MOVW $4, R0 // CLOCK_MONOTONIC
207 MOVW $8(R13), R1
208 MOVW $SYS_clock_gettime, R7
209 SWI $0
210
211 MOVW 8(R13), R0 // sec.low
212 MOVW 12(R13), R4 // sec.high
213 MOVW 16(R13), R2 // nsec
214
215 MOVW $1000000000, R3
216 MULLU R0, R3, (R1, R0)
217 MUL R3, R4
218 ADD.S R2, R0
219 ADC R4, R1
220
221 MOVW R0, ret_lo+0(FP)
222 MOVW R1, ret_hi+4(FP)
223 RET
224
225TEXT runtime·asmSigaction(SB),NOSPLIT|NOFRAME,$0
226 MOVW sig+0(FP), R0 // arg 1 sig
227 MOVW new+4(FP), R1 // arg 2 act
228 MOVW old+8(FP), R2 // arg 3 oact
229 MOVW $SYS_sigaction, R7
230 SWI $0
231 MOVW.CS $-1, R0
232 MOVW R0, ret+12(FP)
233 RET
234
235TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0
236 // Reserve space for callee-save registers and arguments.
237 MOVM.DB.W [R4-R11], (R13)
238 SUB $16, R13
239
240 // this might be called in external code context,
241 // where g is not set.
242 // first save R0, because runtime·load_g will clobber it
243 MOVW R0, 4(R13) // signum
244 MOVB runtime·iscgo(SB), R0
245 CMP $0, R0
246 BL.NE runtime·load_g(SB)
247
248 MOVW R1, 8(R13)
249 MOVW R2, 12(R13)
250 BL runtime·sigtrampgo(SB)
251
252 // Restore callee-save registers.
253 ADD $16, R13
254 MOVM.IA.W (R13), [R4-R11]
255
256 RET
257
258TEXT runtime·mmap(SB),NOSPLIT,$16
259 MOVW addr+0(FP), R0 // arg 1 addr
260 MOVW n+4(FP), R1 // arg 2 len
261 MOVW prot+8(FP), R2 // arg 3 prot
262 MOVW flags+12(FP), R3 // arg 4 flags
263 // arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
264 // note the C runtime only passes the 32-bit offset_lo to us
265 MOVW fd+16(FP), R4 // arg 5
266 MOVW R4, 4(R13)
267 MOVW off+20(FP), R5 // arg 6 lower 32-bit
268 // the word at 8(R13) is skipped due to 64-bit argument alignment.
269 MOVW R5, 12(R13)
270 MOVW $0, R6 // higher 32-bit for arg 6
271 MOVW R6, 16(R13)
272 ADD $4, R13
273 MOVW $SYS_mmap, R7
274 SWI $0
275 SUB $4, R13
276 MOVW $0, R1
277 MOVW.CS R0, R1 // if failed, put in R1
278 MOVW.CS $0, R0
279 MOVW R0, p+24(FP)
280 MOVW R1, err+28(FP)
281 RET
282
283TEXT runtime·munmap(SB),NOSPLIT,$0
284 MOVW addr+0(FP), R0 // arg 1 addr
285 MOVW n+4(FP), R1 // arg 2 len
286 MOVW $SYS_munmap, R7
287 SWI $0
288 MOVW.CS $0, R8 // crash on syscall failure
289 MOVW.CS R8, (R8)
290 RET
291
292TEXT runtime·madvise(SB),NOSPLIT,$0
293 MOVW addr+0(FP), R0 // arg 1 addr
294 MOVW n+4(FP), R1 // arg 2 len
295 MOVW flags+8(FP), R2 // arg 3 flags
296 MOVW $SYS_madvise, R7
297 SWI $0
298 MOVW.CS $-1, R0
299 MOVW R0, ret+12(FP)
300 RET
301
302TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
303 MOVW new+0(FP), R0
304 MOVW old+4(FP), R1
305 MOVW $SYS_sigaltstack, R7
306 SWI $0
307 MOVW.CS $0, R8 // crash on syscall failure
308 MOVW.CS R8, (R8)
309 RET
310
311TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
312 MOVW sig+4(FP), R0
313 MOVW info+8(FP), R1
314 MOVW ctx+12(FP), R2
315 MOVW fn+0(FP), R11
316 MOVW R13, R4
317 SUB $24, R13
318 BIC $0x7, R13 // alignment for ELF ABI
319 BL (R11)
320 MOVW R4, R13
321 RET
322
323TEXT runtime·usleep(SB),NOSPLIT,$16
324 MOVW usec+0(FP), R0
325 CALL runtime·usplitR0(SB)
326 // 0(R13) is the saved LR, don't use it
327 MOVW R0, 4(R13) // tv_sec.low
328 MOVW $0, R0
329 MOVW R0, 8(R13) // tv_sec.high
330 MOVW $1000, R2
331 MUL R1, R2
332 MOVW R2, 12(R13) // tv_nsec
333
334 MOVW $4(R13), R0 // arg 1 - rqtp
335 MOVW $0, R1 // arg 2 - rmtp
336 MOVW $SYS_nanosleep, R7
337 SWI $0
338 RET
339
340TEXT runtime·sysctl(SB),NOSPLIT,$0
341 MOVW mib+0(FP), R0 // arg 1 - name
342 MOVW miblen+4(FP), R1 // arg 2 - namelen
343 MOVW out+8(FP), R2 // arg 3 - old
344 MOVW size+12(FP), R3 // arg 4 - oldlenp
345 // arg 5 (newp) and arg 6 (newlen) are passed on stack
346 ADD $20, R13
347 MOVW $SYS___sysctl, R7
348 SWI $0
349 SUB.CS $0, R0, R0
350 SUB $20, R13
351 MOVW R0, ret+24(FP)
352 RET
353
354TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
355 MOVW $SYS_sched_yield, R7
356 SWI $0
357 RET
358
359TEXT runtime·sigprocmask(SB),NOSPLIT,$0
360 MOVW how+0(FP), R0 // arg 1 - how
361 MOVW new+4(FP), R1 // arg 2 - set
362 MOVW old+8(FP), R2 // arg 3 - oset
363 MOVW $SYS_sigprocmask, R7
364 SWI $0
365 MOVW.CS $0, R8 // crash on syscall failure
366 MOVW.CS R8, (R8)
367 RET
368
369// int32 runtime·kqueue(void)
370TEXT runtime·kqueue(SB),NOSPLIT,$0
371 MOVW $SYS_kqueue, R7
372 SWI $0
373 RSB.CS $0, R0
374 MOVW R0, ret+0(FP)
375 RET
376
377// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
378TEXT runtime·kevent(SB),NOSPLIT,$0
379 MOVW kq+0(FP), R0 // kq
380 MOVW ch+4(FP), R1 // changelist
381 MOVW nch+8(FP), R2 // nchanges
382 MOVW ev+12(FP), R3 // eventlist
383 ADD $20, R13 // pass arg 5 and 6 on stack
384 MOVW $SYS_kevent, R7
385 SWI $0
386 RSB.CS $0, R0
387 SUB $20, R13
388 MOVW R0, ret+24(FP)
389 RET
390
391// func fcntl(fd, cmd, arg int32) (int32, int32)
392TEXT runtime·fcntl(SB),NOSPLIT,$0
393 MOVW fd+0(FP), R0 // fd
394 MOVW cmd+4(FP), R1 // cmd
395 MOVW arg+8(FP), R2 // arg
396 MOVW $SYS_fcntl, R7
397 SWI $0
398 MOVW $0, R1
399 MOVW.CS R0, R1
400 MOVW.CS $-1, R0
401 MOVW R0, ret+12(FP)
402 MOVW R1, errno+16(FP)
403 RET
404
405// TODO: this is only valid for ARMv7+
406TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
407 B runtime·armPublicationBarrier(SB)
408
409// TODO(minux): this only supports ARMv6K+.
410TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
411 WORD $0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
412 RET
413
414// func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32
415TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28
416 MOVW level+0(FP), R0
417 MOVW which+4(FP), R1
418 MOVW id_lo+8(FP), R2
419 MOVW id_hi+12(FP), R3
420 ADD $20, R13 // Pass size and mask on stack.
421 MOVW $SYS_cpuset_getaffinity, R7
422 SWI $0
423 RSB.CS $0, R0
424 SUB $20, R13
425 MOVW R0, ret+24(FP)
426 RET
427
428// func getCntxct(physical bool) uint32
429TEXT runtime·getCntxct(SB),NOSPLIT|NOFRAME,$0-8
430 MOVB runtime·goarm(SB), R11
431 CMP $7, R11
432 BLT 2(PC)
433 DMB
434
435 MOVB physical+0(FP), R0
436 CMP $1, R0
437 B.NE 3(PC)
438
439 // get CNTPCT (Physical Count Register) into R0(low) R1(high)
440 // mrrc 15, 0, r0, r1, cr14
441 WORD $0xec510f0e
442 B 2(PC)
443
444 // get CNTVCT (Virtual Count Register) into R0(low) R1(high)
445 // mrrc 15, 1, r0, r1, cr14
446 WORD $0xec510f1e
447
448 MOVW R0, ret+4(FP)
449 RET
450
451// func issetugid() int32
452TEXT runtime·issetugid(SB),NOSPLIT,$0
453 MOVW $SYS_issetugid, R7
454 SWI $0
455 MOVW R0, ret+0(FP)
456 RET
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