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
428