summaryrefslogtreecommitdiffstats
path: root/src/runtime/sys_freebsd_arm.s
blob: 44430f5eae458e2c3e54dc179d1777e2416493ba (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
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
// Copyright 2012 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, FreeBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"

// for EABI, as we don't support OABI
#define SYS_BASE 0x0

#define SYS_exit (SYS_BASE + 1)
#define SYS_read (SYS_BASE + 3)
#define SYS_write (SYS_BASE + 4)
#define SYS_open (SYS_BASE + 5)
#define SYS_close (SYS_BASE + 6)
#define SYS_getpid (SYS_BASE + 20)
#define SYS_kill (SYS_BASE + 37)
#define SYS_sigaltstack (SYS_BASE + 53)
#define SYS_munmap (SYS_BASE + 73)
#define SYS_madvise (SYS_BASE + 75)
#define SYS_setitimer (SYS_BASE + 83)
#define SYS_fcntl (SYS_BASE + 92)
#define SYS___sysctl (SYS_BASE + 202)
#define SYS_nanosleep (SYS_BASE + 240)
#define SYS_issetugid (SYS_BASE + 253)
#define SYS_clock_gettime (SYS_BASE + 232)
#define SYS_sched_yield (SYS_BASE + 331)
#define SYS_sigprocmask (SYS_BASE + 340)
#define SYS_kqueue (SYS_BASE + 362)
#define SYS_sigaction (SYS_BASE + 416)
#define SYS_thr_exit (SYS_BASE + 431)
#define SYS_thr_self (SYS_BASE + 432)
#define SYS_thr_kill (SYS_BASE + 433)
#define SYS__umtx_op (SYS_BASE + 454)
#define SYS_thr_new (SYS_BASE + 455)
#define SYS_mmap (SYS_BASE + 477)
#define SYS_cpuset_getaffinity (SYS_BASE + 487)
#define SYS_pipe2 (SYS_BASE + 542)
#define SYS_kevent (SYS_BASE + 560)

TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
	MOVW addr+0(FP), R0
	MOVW mode+4(FP), R1
	MOVW val+8(FP), R2
	MOVW uaddr1+12(FP), R3
	ADD $20, R13 // arg 5 is passed on stack
	MOVW $SYS__umtx_op, R7
	SWI $0
	RSB.CS $0, R0
	SUB $20, R13
	// BCS error
	MOVW	R0, ret+20(FP)
	RET

TEXT runtime·thr_new(SB),NOSPLIT,$0
	MOVW param+0(FP), R0
	MOVW size+4(FP), R1
	MOVW $SYS_thr_new, R7
	SWI $0
	RSB.CS $0, R0
	MOVW	R0, ret+8(FP)
	RET

TEXT runtime·thr_start(SB),NOSPLIT,$0
	// set up g
	MOVW m_g0(R0), g
	MOVW R0, g_m(g)
	BL runtime·emptyfunc(SB) // fault if stack check is wrong
	BL runtime·mstart(SB)

	MOVW $2, R8  // crash (not reached)
	MOVW R8, (R8)
	RET

// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
	MOVW code+0(FP), R0	// arg 1 exit status
	MOVW $SYS_exit, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
	MOVW	wait+0(FP), R0
	// We're done using the stack.
	MOVW	$0, R2
storeloop:
	LDREX	(R0), R4          // loads R4
	STREX	R2, (R0), R1      // stores R2
	CMP	$0, R1
	BNE	storeloop
	MOVW	$0, R0		// arg 1 long *state
	MOVW	$SYS_thr_exit, R7
	SWI	$0
	MOVW.CS	$0, R8 // crash on syscall failure
	MOVW.CS	R8, (R8)
	JMP	0(PC)

TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
	MOVW name+0(FP), R0	// arg 1 name
	MOVW mode+4(FP), R1	// arg 2 mode
	MOVW perm+8(FP), R2	// arg 3 perm
	MOVW $SYS_open, R7
	SWI $0
	MOVW.CS	$-1, R0
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
	MOVW fd+0(FP), R0	// arg 1 fd
	MOVW p+4(FP), R1	// arg 2 buf
	MOVW n+8(FP), R2	// arg 3 count
	MOVW $SYS_read, R7
	SWI $0
	RSB.CS	$0, R0		// caller expects negative errno
	MOVW	R0, ret+12(FP)
	RET

// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT,$0-16
	MOVW	$r+4(FP), R0
	MOVW	flags+0(FP), R1
	MOVW	$SYS_pipe2, R7
	SWI	$0
	RSB.CS $0, R0
	MOVW	R0, errno+12(FP)
	RET

TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
	MOVW fd+0(FP), R0	// arg 1 fd
	MOVW p+4(FP), R1	// arg 2 buf
	MOVW n+8(FP), R2	// arg 3 count
	MOVW $SYS_write, R7
	SWI $0
	RSB.CS	$0, R0		// caller expects negative errno
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
	MOVW fd+0(FP), R0	// arg 1 fd
	MOVW $SYS_close, R7
	SWI $0
	MOVW.CS	$-1, R0
	MOVW	R0, ret+4(FP)
	RET

TEXT runtime·thr_self(SB),NOSPLIT,$0-4
	// thr_self(&0(FP))
	MOVW $ret+0(FP), R0 // arg 1
	MOVW $SYS_thr_self, R7
	SWI $0
	RET

TEXT runtime·thr_kill(SB),NOSPLIT,$0-8
	// thr_kill(tid, sig)
	MOVW tid+0(FP), R0	// arg 1 id
	MOVW sig+4(FP), R1	// arg 2 signal
	MOVW $SYS_thr_kill, R7
	SWI $0
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$0
	// getpid
	MOVW $SYS_getpid, R7
	SWI $0
	// kill(self, sig)
				// arg 1 - pid, now in R0
	MOVW sig+0(FP), R1	// arg 2 - signal
	MOVW $SYS_kill, R7
	SWI $0
	RET

TEXT runtime·setitimer(SB), NOSPLIT|NOFRAME, $0
	MOVW mode+0(FP), R0
	MOVW new+4(FP), R1
	MOVW old+8(FP), R2
	MOVW $SYS_setitimer, R7
	SWI $0
	RET

// func fallback_walltime() (sec int64, nsec int32)
TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12
	MOVW $0, R0 // CLOCK_REALTIME
	MOVW $8(R13), R1
	MOVW $SYS_clock_gettime, R7
	SWI $0

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

	MOVW R0, sec_lo+0(FP)
	MOVW R1, sec_hi+4(FP)
	MOVW R2, nsec+8(FP)
	RET

// func fallback_nanotime() int64
TEXT runtime·fallback_nanotime(SB), NOSPLIT, $32
	MOVW $4, R0 // CLOCK_MONOTONIC
	MOVW $8(R13), R1
	MOVW $SYS_clock_gettime, R7
	SWI $0

	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·asmSigaction(SB),NOSPLIT|NOFRAME,$0
	MOVW sig+0(FP), R0		// arg 1 sig
	MOVW new+4(FP), R1		// arg 2 act
	MOVW old+8(FP), R2		// arg 3 oact
	MOVW $SYS_sigaction, R7
	SWI $0
	MOVW.CS	$-1, R0
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0
	// Reserve space for callee-save registers and arguments.
	MOVM.DB.W [R4-R11], (R13)
	SUB	$16, R13

	// 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)

	MOVW	R1, 8(R13)
	MOVW	R2, 12(R13)
	BL	runtime·sigtrampgo(SB)

	// Restore callee-save registers.
	ADD	$16, R13
	MOVM.IA.W (R13), [R4-R11]

	RET

TEXT runtime·mmap(SB),NOSPLIT,$16
	MOVW addr+0(FP), R0		// arg 1 addr
	MOVW n+4(FP), R1		// arg 2 len
	MOVW prot+8(FP), R2		// arg 3 prot
	MOVW flags+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 fd+16(FP), R4		// arg 5
	MOVW R4, 4(R13)
	MOVW off+20(FP), R5		// arg 6 lower 32-bit
	// the word at 8(R13) is skipped due to 64-bit argument alignment.
	MOVW R5, 12(R13)
	MOVW $0, R6 		// higher 32-bit for arg 6
	MOVW R6, 16(R13)
	ADD $4, R13
	MOVW $SYS_mmap, R7
	SWI $0
	SUB $4, R13
	MOVW $0, R1
	MOVW.CS R0, R1		// if failed, put in R1
	MOVW.CS $0, R0
	MOVW	R0, p+24(FP)
	MOVW	R1, err+28(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVW addr+0(FP), R0		// arg 1 addr
	MOVW n+4(FP), R1		// arg 2 len
	MOVW $SYS_munmap, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·madvise(SB),NOSPLIT,$0
	MOVW	addr+0(FP), R0		// arg 1 addr
	MOVW	n+4(FP), R1		// arg 2 len
	MOVW	flags+8(FP), R2		// arg 3 flags
	MOVW	$SYS_madvise, R7
	SWI	$0
	MOVW.CS $-1, R0
	MOVW	R0, ret+12(FP)
	RET

TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
	MOVW new+0(FP), R0
	MOVW old+4(FP), R1
	MOVW $SYS_sigaltstack, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
	MOVW	sig+4(FP), R0
	MOVW	info+8(FP), R1
	MOVW	ctx+12(FP), R2
	MOVW	fn+0(FP), R11
	MOVW	R13, R4
	SUB	$24, R13
	BIC	$0x7, R13 // alignment for ELF ABI
	BL	(R11)
	MOVW	R4, R13
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16
	MOVW usec+0(FP), R0
	CALL runtime·usplitR0(SB)
	// 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
	MOVW $1000, R2
	MUL R1, R2
	MOVW R2, 12(R13) // tv_nsec

	MOVW $4(R13), R0 // arg 1 - rqtp
	MOVW $0, R1      // arg 2 - rmtp
	MOVW $SYS_nanosleep, R7
	SWI $0
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVW mib+0(FP), R0	// arg 1 - name
	MOVW miblen+4(FP), R1	// arg 2 - namelen
	MOVW out+8(FP), R2	// arg 3 - old
	MOVW size+12(FP), R3	// arg 4 - oldlenp
	// arg 5 (newp) and arg 6 (newlen) are passed on stack
	ADD $20, R13
	MOVW $SYS___sysctl, R7
	SWI $0
	SUB.CS $0, R0, R0
	SUB $20, R13
	MOVW	R0, ret+24(FP)
	RET

TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
	MOVW $SYS_sched_yield, R7
	SWI $0
	RET

TEXT runtime·sigprocmask(SB),NOSPLIT,$0
	MOVW how+0(FP), R0	// arg 1 - how
	MOVW new+4(FP), R1	// arg 2 - set
	MOVW old+8(FP), R2	// arg 3 - oset
	MOVW $SYS_sigprocmask, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
	MOVW $SYS_kqueue, R7
	SWI $0
	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,$0
	MOVW kq+0(FP), R0	// kq
	MOVW ch+4(FP), R1	// changelist
	MOVW nch+8(FP), R2	// nchanges
	MOVW ev+12(FP), R3	// eventlist
	ADD $20, R13	// pass arg 5 and 6 on stack
	MOVW $SYS_kevent, R7
	SWI $0
	RSB.CS $0, R0
	SUB $20, R13
	MOVW	R0, ret+24(FP)
	RET

// func fcntl(fd, cmd, arg int32) (int32, int32)
TEXT runtime·fcntl(SB),NOSPLIT,$0
	MOVW fd+0(FP), R0	// fd
	MOVW cmd+4(FP), R1	// cmd
	MOVW arg+8(FP), R2	// arg
	MOVW $SYS_fcntl, R7
	SWI $0
	MOVW $0, R1
	MOVW.CS R0, R1
	MOVW.CS $-1, R0
	MOVW R0, ret+12(FP)
	MOVW R1, errno+16(FP)
	RET

// TODO: this is only valid for ARMv7+
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
	B	runtime·armPublicationBarrier(SB)

// TODO(minux): this only supports ARMv6K+.
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
	WORD $0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
	RET

// func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32
TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28
	MOVW	level+0(FP), R0
	MOVW	which+4(FP), R1
	MOVW	id_lo+8(FP), R2
	MOVW	id_hi+12(FP), R3
	ADD	$20, R13	// Pass size and mask on stack.
	MOVW	$SYS_cpuset_getaffinity, R7
	SWI	$0
	RSB.CS	$0, R0
	SUB	$20, R13
	MOVW	R0, ret+24(FP)
	RET

// func getCntxct(physical bool) uint32
TEXT runtime·getCntxct(SB),NOSPLIT|NOFRAME,$0-8
	MOVB	runtime·goarm(SB), R11
	CMP	$7, R11
	BLT	2(PC)
	DMB

	MOVB	physical+0(FP), R0
	CMP	$1, R0
	B.NE	3(PC)

	// get CNTPCT (Physical Count Register) into R0(low) R1(high)
	// mrrc    15, 0, r0, r1, cr14
	WORD	$0xec510f0e
	B	2(PC)

	// get CNTVCT (Virtual Count Register) into R0(low) R1(high)
	// mrrc    15, 1, r0, r1, cr14
	WORD	$0xec510f1e

	MOVW	R0, ret+4(FP)
	RET

// func issetugid() int32
TEXT runtime·issetugid(SB),NOSPLIT,$0
	MOVW $SYS_issetugid, R7
	SWI $0
	MOVW	R0, ret+0(FP)
	RET