summaryrefslogtreecommitdiff
path: root/src/runtime/sys_netbsd_arm.s
blob: 039a0832e067d6b329a4dc5451beee720ca7074e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
// System calls and other sys.stuff for ARM, NetBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//

#include "zasm_GOOS_GOARCH.h"
#include "textflag.h"

// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT,$-4
	MOVW 0(FP), R0	// arg 1 exit status
	SWI $0xa00001
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·exit1(SB),NOSPLIT,$-4
	SWI $0xa00136	// sys__lwp_exit
	MOVW $1, R8	// crash
	MOVW R8, (R8)
	RET
	
TEXT runtime·open(SB),NOSPLIT,$-8
	MOVW 0(FP), R0
	MOVW 4(FP), R1
	MOVW 8(FP), R2
	SWI $0xa00005
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·close(SB),NOSPLIT,$-8
	MOVW 0(FP), R0
	SWI $0xa00006
	MOVW	R0, ret+4(FP)
	RET

TEXT runtime·read(SB),NOSPLIT,$-8
	MOVW 0(FP), R0
	MOVW 4(FP), R1
	MOVW 8(FP), R2
	SWI $0xa00003
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·write(SB),NOSPLIT,$-4
	MOVW	0(FP), R0	// arg 1 - fd
	MOVW	4(FP), R1	// arg 2 - buf
	MOVW	8(FP), R2	// arg 3 - nbyte
	SWI $0xa00004	// sys_write
	MOVW	R0, ret+12(FP)
	RET

// int32 lwp_create(void *context, uintptr flags, void *lwpid)
TEXT runtime·lwp_create(SB),NOSPLIT,$0
	MOVW ctxt+0(FP), R0
	MOVW flags+4(FP), R1
	MOVW lwpid+8(FP), R2
	SWI $0xa00135	// sys__lwp_create
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·osyield(SB),NOSPLIT,$0
	SWI $0xa0015e	// sys_sched_yield
	RET

TEXT runtime·lwp_park(SB),NOSPLIT,$0
	MOVW 0(FP), R0	// arg 1 - abstime
	MOVW 4(FP), R1	// arg 2 - unpark
	MOVW 8(FP), R2	// arg 3 - hint
	MOVW 12(FP), R3	// arg 4 - unparkhint
	SWI $0xa001b2	// sys__lwp_park
	MOVW	R0, ret+16(FP)
	RET

TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
	MOVW	0(FP), R0	// arg 1 - lwp
	MOVW	4(FP), R1	// arg 2 - hint
	SWI $0xa00141 // sys__lwp_unpark
	MOVW	R0, ret+8(FP)
	RET

TEXT runtime·lwp_self(SB),NOSPLIT,$0
	SWI $0xa00137	// sys__lwp_self
	MOVW	R0, ret+0(FP)
	RET

TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
	MOVW R0, g_m(R1)
	MOVW R1, g

	BL runtime·emptyfunc(SB) // fault if stack check is wrong
	BL (R2)
	MOVW $2, R8  // crash (not reached)
	MOVW R8, (R8)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16
	MOVW usec+0(FP), R0
	MOVW R0, R2
	MOVW $1000000, R1
	DIV R1, R0
	// 0(R13) is the saved LR, don't use it
	MOVW R0, 4(R13) // tv_sec.low
	MOVW $0, R0
	MOVW R0, 8(R13) // tv_sec.high
	MOD R1, R2
	MOVW $1000, R1
	MUL R1, R2
	MOVW R2, 12(R13) // tv_nsec

	MOVW $4(R13), R0 // arg 1 - rqtp
	MOVW $0, R1      // arg 2 - rmtp
	SWI $0xa001ae	// sys_nanosleep
	RET

TEXT runtime·raise(SB),NOSPLIT,$16
	SWI $0xa00137	// sys__lwp_self, the returned R0 is arg 1
	MOVW	sig+0(FP), R1	// arg 2 - signal
	SWI $0xa0013e	// sys__lwp_kill
	RET

TEXT runtime·setitimer(SB),NOSPLIT,$-4
	MOVW 0(FP), R0	// arg 1 - which
	MOVW 4(FP), R1	// arg 2 - itv
	MOVW 8(FP), R2	// arg 3 - oitv
	SWI $0xa001a9	// sys_setitimer
	RET

// func now() (sec int64, nsec int32)
TEXT time·now(SB), NOSPLIT, $32
	MOVW $0, R0	// CLOCK_REALTIME
	MOVW $8(R13), R1
	SWI $0xa001ab	// clock_gettime

	MOVW 8(R13), R0	// sec.low
	MOVW 12(R13), R1 // sec.high
	MOVW 16(R13), R2 // nsec

	MOVW R0, 0(FP)
	MOVW R1, 4(FP)
	MOVW R2, 8(FP)
	RET

// int64 nanotime(void) so really
// void nanotime(int64 *nsec)
TEXT runtime·nanotime(SB), NOSPLIT, $32
	MOVW $0, R0 // CLOCK_REALTIME
	MOVW $8(R13), R1
	SWI $0xa001ab	// clock_gettime

	MOVW 8(R13), R0 // sec.low
	MOVW 12(R13), R4 // sec.high
	MOVW 16(R13), R2 // nsec

	MOVW $1000000000, R3
	MULLU R0, R3, (R1, R0)
	MUL R3, R4
	ADD.S R2, R0
	ADC R4, R1

	MOVW R0, ret_lo+0(FP)
	MOVW R1, ret_hi+4(FP)
	RET

TEXT runtime·getcontext(SB),NOSPLIT,$-4
	MOVW 0(FP), R0	// arg 1 - context
	SWI $0xa00133	// sys_getcontext
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sigprocmask(SB),NOSPLIT,$0
	MOVW 0(FP), R0	// arg 1 - how
	MOVW 4(FP), R1	// arg 2 - set
	MOVW 8(FP), R2	// arg 3 - oset
	SWI $0xa00125	// sys_sigprocmask
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sigreturn_tramp(SB),NOSPLIT,$-4
	// on entry, SP points to siginfo, we add sizeof(ucontext)
	// to SP to get a pointer to ucontext.
	ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT)
	SWI $0xa00134	// sys_setcontext
	// something failed, we have to exit
	MOVW $0x4242, R0 // magic return number
	SWI $0xa00001	// sys_exit
	B -2(PC)	// continue exit

TEXT runtime·sigaction(SB),NOSPLIT,$4
	MOVW 0(FP), R0	// arg 1 - signum
	MOVW 4(FP), R1	// arg 2 - nsa
	MOVW 8(FP), R2	// arg 3 - osa
	MOVW $runtime·sigreturn_tramp(SB), R3	// arg 4 - tramp
	MOVW $2, R4	// arg 5 - vers
	MOVW R4, 4(R13)
	ADD $4, R13	// pass arg 5 on stack
	SWI $0xa00154	// sys___sigaction_sigtramp
	SUB $4, R13
	MOVW.CS $3, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sigtramp(SB),NOSPLIT,$24
	// this might be called in external code context,
	// where g is not set.
	// first save R0, because runtime·load_g will clobber it
	MOVW	R0, 4(R13) // signum
	MOVB	runtime·iscgo(SB), R0
	CMP 	$0, R0
	BL.NE	runtime·load_g(SB)

	CMP $0, g
	BNE 4(PC)
	// signal number is already prepared in 4(R13)
	MOVW $runtime·badsignal(SB), R11
	BL (R11)
	RET

	// save g
	MOVW g, R4
	MOVW g, 20(R13)

	// g = m->signal
	MOVW g_m(g), R8
	MOVW m_gsignal(R8), g

	// R0 is already saved
	MOVW R1, 8(R13) // info
	MOVW R2, 12(R13) // context
	MOVW R4, 16(R13) // gp

	BL runtime·sighandler(SB)

	// restore g
	MOVW 20(R13), g
	RET

TEXT runtime·mmap(SB),NOSPLIT,$12
	MOVW 0(FP), R0	// arg 1 - addr
	MOVW 4(FP), R1	// arg 2 - len
	MOVW 8(FP), R2	// arg 3 - prot
	MOVW 12(FP), R3	// arg 4 - flags
	// arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
	// note the C runtime only passes the 32-bit offset_lo to us
	MOVW 16(FP), R4		// arg 5
	MOVW R4, 4(R13)
	MOVW 20(FP), R5		// arg 6 lower 32-bit
	MOVW R5, 8(R13)
	MOVW $0, R6 // higher 32-bit for arg 6
	MOVW R6, 12(R13)
	ADD $4, R13 // pass arg 5 and arg 6 on stack
	SWI $0xa000c5	// sys_mmap
	SUB $4, R13
	MOVW	R0, ret+24(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVW 0(FP), R0	// arg 1 - addr
	MOVW 4(FP), R1	// arg 2 - len
	SWI $0xa00049	// sys_munmap
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·madvise(SB),NOSPLIT,$0
	MOVW 0(FP), R0	// arg 1 - addr
	MOVW 4(FP), R1	// arg 2 - len
	MOVW 8(FP), R2	// arg 3 - behav
	SWI $0xa0004b	// sys_madvise
	// ignore failure - maybe pages are locked
	RET

TEXT runtime·sigaltstack(SB),NOSPLIT,$-4
	MOVW 0(FP), R0	// arg 1 - nss
	MOVW 4(FP), R1	// arg 2 - oss
	SWI $0xa00119	// sys___sigaltstack14
	MOVW.CS $0, R8	// crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$8
	MOVW 0(FP), R0	// arg 1 - name
	MOVW 4(FP), R1	// arg 2 - namelen
	MOVW 8(FP), R2	// arg 3 - oldp
	MOVW 12(FP), R3	// arg 4 - oldlenp
	MOVW 16(FP), R4	// arg 5 - newp
	MOVW R4, 4(R13)
	MOVW 20(FP), R4	// arg 6 - newlen
	MOVW R4, 8(R13)
	ADD $4, R13	// pass arg 5 and 6 on stack
	SWI $0xa000ca	// sys___sysctl
	SUB $4, R13
	MOVW	R0, ret+24(FP)
	RET

// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
	SWI $0xa00158	// sys_kqueue
	RSB.CS $0, R0
	MOVW	R0, ret+0(FP)
	RET

// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
TEXT runtime·kevent(SB),NOSPLIT,$8
	MOVW 0(FP), R0	// kq
	MOVW 4(FP), R1	// changelist
	MOVW 8(FP), R2	// nchanges
	MOVW 12(FP), R3	// eventlist
	MOVW 16(FP), R4	// nevents
	MOVW R4, 4(R13)
	MOVW 20(FP), R4	// timeout
	MOVW R4, 8(R13)
	ADD $4, R13	// pass arg 5 and 6 on stack
	SWI $0xa001b3	// sys___kevent50
	RSB.CS $0, R0
	SUB $4, R13
	MOVW	R0, ret+24(FP)
	RET

// void runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
	MOVW 0(FP), R0	// fd
	MOVW $2, R1	// F_SETFD
	MOVW $1, R2	// FD_CLOEXEC
	SWI $0xa0005c	// sys_fcntl
	RET

TEXT runtime·casp(SB),NOSPLIT,$0
	B	runtime·cas(SB)

// TODO(minux): this is only valid for ARMv6+
// bool armcas(int32 *val, int32 old, int32 new)
// Atomically:
//	if(*val == old){
//		*val = new;
//		return 1;
//	}else
//		return 0;
TEXT runtime·cas(SB),NOSPLIT,$0
	B runtime·armcas(SB)

TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
	MOVM.WP [R1, R2, R3, R12], (R13)
	SWI $0x00a0013c // _lwp_getprivate
	MOVM.IAW    (R13), [R1, R2, R3, R12]
	RET