1// Copyright 2016 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//go:build linux && (mips || mipsle)
6
7//
8// System calls and other sys.stuff for mips, Linux
9//
10
11#include "go_asm.h"
12#include "go_tls.h"
13#include "textflag.h"
14
15#define SYS_exit		4001
16#define SYS_read		4003
17#define SYS_write		4004
18#define SYS_open		4005
19#define SYS_close		4006
20#define SYS_getpid		4020
21#define SYS_kill		4037
22#define SYS_brk			4045
23#define SYS_mmap		4090
24#define SYS_munmap		4091
25#define SYS_setitimer		4104
26#define SYS_clone		4120
27#define SYS_sched_yield		4162
28#define SYS_nanosleep		4166
29#define SYS_rt_sigreturn	4193
30#define SYS_rt_sigaction	4194
31#define SYS_rt_sigprocmask	4195
32#define SYS_sigaltstack		4206
33#define SYS_madvise		4218
34#define SYS_mincore		4217
35#define SYS_gettid		4222
36#define SYS_futex		4238
37#define SYS_sched_getaffinity	4240
38#define SYS_exit_group		4246
39#define SYS_timer_create	4257
40#define SYS_timer_settime	4258
41#define SYS_timer_delete	4261
42#define SYS_clock_gettime	4263
43#define SYS_tgkill		4266
44#define SYS_pipe2		4328
45
46TEXT runtime·exit(SB),NOSPLIT,$0-4
47	MOVW	code+0(FP), R4
48	MOVW	$SYS_exit_group, R2
49	SYSCALL
50	UNDEF
51	RET
52
53// func exitThread(wait *atomic.Uint32)
54TEXT runtime·exitThread(SB),NOSPLIT,$0-4
55	MOVW	wait+0(FP), R1
56	// We're done using the stack.
57	MOVW	$0, R2
58	SYNC
59	MOVW	R2, (R1)
60	SYNC
61	MOVW	$0, R4	// exit code
62	MOVW	$SYS_exit, R2
63	SYSCALL
64	UNDEF
65	JMP	0(PC)
66
67TEXT runtime·open(SB),NOSPLIT,$0-16
68	MOVW	name+0(FP), R4
69	MOVW	mode+4(FP), R5
70	MOVW	perm+8(FP), R6
71	MOVW	$SYS_open, R2
72	SYSCALL
73	BEQ	R7, 2(PC)
74	MOVW	$-1, R2
75	MOVW	R2, ret+12(FP)
76	RET
77
78TEXT runtime·closefd(SB),NOSPLIT,$0-8
79	MOVW	fd+0(FP), R4
80	MOVW	$SYS_close, R2
81	SYSCALL
82	BEQ	R7, 2(PC)
83	MOVW	$-1, R2
84	MOVW	R2, ret+4(FP)
85	RET
86
87TEXT runtime·write1(SB),NOSPLIT,$0-16
88	MOVW	fd+0(FP), R4
89	MOVW	p+4(FP), R5
90	MOVW	n+8(FP), R6
91	MOVW	$SYS_write, R2
92	SYSCALL
93	BEQ	R7, 2(PC)
94	SUBU	R2, R0, R2	// caller expects negative errno
95	MOVW	R2, ret+12(FP)
96	RET
97
98TEXT runtime·read(SB),NOSPLIT,$0-16
99	MOVW	fd+0(FP), R4
100	MOVW	p+4(FP), R5
101	MOVW	n+8(FP), R6
102	MOVW	$SYS_read, R2
103	SYSCALL
104	BEQ	R7, 2(PC)
105	SUBU	R2, R0, R2	// caller expects negative errno
106	MOVW	R2, ret+12(FP)
107	RET
108
109// func pipe2(flags int32) (r, w int32, errno int32)
110TEXT runtime·pipe2(SB),NOSPLIT,$0-16
111	MOVW	$r+4(FP), R4
112	MOVW	flags+0(FP), R5
113	MOVW	$SYS_pipe2, R2
114	SYSCALL
115	BEQ	R7, 2(PC)
116	SUBU	R2, R0, R2	// caller expects negative errno
117	MOVW	R2, errno+12(FP)
118	RET
119
120TEXT runtime·usleep(SB),NOSPLIT,$28-4
121	MOVW	usec+0(FP), R3
122	MOVW	R3, R5
123	MOVW	$1000000, R4
124	DIVU	R4, R3
125	MOVW	LO, R3
126	MOVW	R3, 24(R29)
127	MOVW	$1000, R4
128	MULU	R3, R4
129	MOVW	LO, R4
130	SUBU	R4, R5
131	MOVW	R5, 28(R29)
132
133	// nanosleep(&ts, 0)
134	ADDU	$24, R29, R4
135	MOVW	$0, R5
136	MOVW	$SYS_nanosleep, R2
137	SYSCALL
138	RET
139
140TEXT runtime·gettid(SB),NOSPLIT,$0-4
141	MOVW	$SYS_gettid, R2
142	SYSCALL
143	MOVW	R2, ret+0(FP)
144	RET
145
146TEXT runtime·raise(SB),NOSPLIT,$0-4
147	MOVW	$SYS_getpid, R2
148	SYSCALL
149	MOVW	R2, R16
150	MOVW	$SYS_gettid, R2
151	SYSCALL
152	MOVW	R2, R5	// arg 2 tid
153	MOVW	R16, R4	// arg 1 pid
154	MOVW	sig+0(FP), R6	// arg 3
155	MOVW	$SYS_tgkill, R2
156	SYSCALL
157	RET
158
159TEXT runtime·raiseproc(SB),NOSPLIT,$0
160	MOVW	$SYS_getpid, R2
161	SYSCALL
162	MOVW	R2, R4	// arg 1 pid
163	MOVW	sig+0(FP), R5	// arg 2
164	MOVW	$SYS_kill, R2
165	SYSCALL
166	RET
167
168TEXT ·getpid(SB),NOSPLIT,$0-4
169	MOVW	$SYS_getpid, R2
170	SYSCALL
171	MOVW	R2, ret+0(FP)
172	RET
173
174TEXT ·tgkill(SB),NOSPLIT,$0-12
175	MOVW	tgid+0(FP), R4
176	MOVW	tid+4(FP), R5
177	MOVW	sig+8(FP), R6
178	MOVW	$SYS_tgkill, R2
179	SYSCALL
180	RET
181
182TEXT runtime·setitimer(SB),NOSPLIT,$0-12
183	MOVW	mode+0(FP), R4
184	MOVW	new+4(FP), R5
185	MOVW	old+8(FP), R6
186	MOVW	$SYS_setitimer, R2
187	SYSCALL
188	RET
189
190TEXT runtime·timer_create(SB),NOSPLIT,$0-16
191	MOVW	clockid+0(FP), R4
192	MOVW	sevp+4(FP), R5
193	MOVW	timerid+8(FP), R6
194	MOVW	$SYS_timer_create, R2
195	SYSCALL
196	MOVW	R2, ret+12(FP)
197	RET
198
199TEXT runtime·timer_settime(SB),NOSPLIT,$0-20
200	MOVW	timerid+0(FP), R4
201	MOVW	flags+4(FP), R5
202	MOVW	new+8(FP), R6
203	MOVW	old+12(FP), R7
204	MOVW	$SYS_timer_settime, R2
205	SYSCALL
206	MOVW	R2, ret+16(FP)
207	RET
208
209TEXT runtime·timer_delete(SB),NOSPLIT,$0-8
210	MOVW	timerid+0(FP), R4
211	MOVW	$SYS_timer_delete, R2
212	SYSCALL
213	MOVW	R2, ret+4(FP)
214	RET
215
216TEXT runtime·mincore(SB),NOSPLIT,$0-16
217	MOVW	addr+0(FP), R4
218	MOVW	n+4(FP), R5
219	MOVW	dst+8(FP), R6
220	MOVW	$SYS_mincore, R2
221	SYSCALL
222	SUBU	R2, R0, R2	// caller expects negative errno
223	MOVW	R2, ret+12(FP)
224	RET
225
226// func walltime() (sec int64, nsec int32)
227TEXT runtime·walltime(SB),NOSPLIT,$8-12
228	MOVW	$0, R4	// CLOCK_REALTIME
229	MOVW	$4(R29), R5
230	MOVW	$SYS_clock_gettime, R2
231	SYSCALL
232	MOVW	4(R29), R3	// sec
233	MOVW	8(R29), R5	// nsec
234	MOVW	$sec+0(FP), R6
235#ifdef GOARCH_mips
236	MOVW	R3, 4(R6)
237	MOVW	R0, 0(R6)
238#else
239	MOVW	R3, 0(R6)
240	MOVW	R0, 4(R6)
241#endif
242	MOVW	R5, nsec+8(FP)
243	RET
244
245TEXT runtime·nanotime1(SB),NOSPLIT,$8-8
246	MOVW	$1, R4	// CLOCK_MONOTONIC
247	MOVW	$4(R29), R5
248	MOVW	$SYS_clock_gettime, R2
249	SYSCALL
250	MOVW	4(R29), R3	// sec
251	MOVW	8(R29), R5	// nsec
252	// sec is in R3, nsec in R5
253	// return nsec in R3
254	MOVW	$1000000000, R4
255	MULU	R4, R3
256	MOVW	LO, R3
257	ADDU	R5, R3
258	SGTU	R5, R3, R4
259	MOVW	$ret+0(FP), R6
260#ifdef GOARCH_mips
261	MOVW	R3, 4(R6)
262#else
263	MOVW	R3, 0(R6)
264#endif
265	MOVW	HI, R3
266	ADDU	R4, R3
267#ifdef GOARCH_mips
268	MOVW	R3, 0(R6)
269#else
270	MOVW	R3, 4(R6)
271#endif
272	RET
273
274TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0-16
275	MOVW	how+0(FP), R4
276	MOVW	new+4(FP), R5
277	MOVW	old+8(FP), R6
278	MOVW	size+12(FP), R7
279	MOVW	$SYS_rt_sigprocmask, R2
280	SYSCALL
281	BEQ	R7, 2(PC)
282	UNDEF	// crash
283	RET
284
285TEXT runtime·rt_sigaction(SB),NOSPLIT,$0-20
286	MOVW	sig+0(FP), R4
287	MOVW	new+4(FP), R5
288	MOVW	old+8(FP), R6
289	MOVW	size+12(FP), R7
290	MOVW	$SYS_rt_sigaction, R2
291	SYSCALL
292	BEQ	R7, 2(PC)
293	SUBU	R2, R0, R2	// caller expects negative errno
294	MOVW	R2, ret+16(FP)
295	RET
296
297TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
298	MOVW	sig+4(FP), R4
299	MOVW	info+8(FP), R5
300	MOVW	ctx+12(FP), R6
301	MOVW	fn+0(FP), R25
302	MOVW	R29, R22
303	SUBU	$16, R29
304	AND	$~7, R29	// shadow space for 4 args aligned to 8 bytes as per O32 ABI
305	JAL	(R25)
306	MOVW	R22, R29
307	RET
308
309TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$12
310	// this might be called in external code context,
311	// where g is not set.
312	MOVB	runtime·iscgo(SB), R1
313	BEQ	R1, 2(PC)
314	JAL	runtime·load_g(SB)
315
316	MOVW	R4, 4(R29)
317	MOVW	R5, 8(R29)
318	MOVW	R6, 12(R29)
319	MOVW	$runtime·sigtrampgo(SB), R1
320	JAL	(R1)
321	RET
322
323TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
324	JMP	runtime·sigtramp(SB)
325
326TEXT runtime·mmap(SB),NOSPLIT,$20-32
327	MOVW	addr+0(FP), R4
328	MOVW	n+4(FP), R5
329	MOVW	prot+8(FP), R6
330	MOVW	flags+12(FP), R7
331	MOVW	fd+16(FP), R8
332	MOVW	off+20(FP), R9
333	MOVW	R8, 16(R29)
334	MOVW	R9, 20(R29)
335
336	MOVW	$SYS_mmap, R2
337	SYSCALL
338	BEQ	R7, ok
339	MOVW	$0, p+24(FP)
340	MOVW	R2, err+28(FP)
341	RET
342ok:
343	MOVW	R2, p+24(FP)
344	MOVW	$0, err+28(FP)
345	RET
346
347TEXT runtime·munmap(SB),NOSPLIT,$0-8
348	MOVW	addr+0(FP), R4
349	MOVW	n+4(FP), R5
350	MOVW	$SYS_munmap, R2
351	SYSCALL
352	BEQ	R7, 2(PC)
353	UNDEF	// crash
354	RET
355
356TEXT runtime·madvise(SB),NOSPLIT,$0-16
357	MOVW	addr+0(FP), R4
358	MOVW	n+4(FP), R5
359	MOVW	flags+8(FP), R6
360	MOVW	$SYS_madvise, R2
361	SYSCALL
362	MOVW	R2, ret+12(FP)
363	RET
364
365// int32 futex(int32 *uaddr, int32 op, int32 val, struct timespec *timeout, int32 *uaddr2, int32 val2);
366TEXT runtime·futex(SB),NOSPLIT,$20-28
367	MOVW	addr+0(FP), R4
368	MOVW	op+4(FP), R5
369	MOVW	val+8(FP), R6
370	MOVW	ts+12(FP), R7
371
372	MOVW	addr2+16(FP), R8
373	MOVW	val3+20(FP), R9
374
375	MOVW	R8, 16(R29)
376	MOVW	R9, 20(R29)
377
378	MOVW	$SYS_futex, R2
379	SYSCALL
380	BEQ	R7, 2(PC)
381	SUBU	R2, R0, R2	// caller expects negative errno
382	MOVW	R2, ret+24(FP)
383	RET
384
385
386// int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
387TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0-24
388	MOVW	flags+0(FP), R4
389	MOVW	stk+4(FP), R5
390	MOVW	R0, R6	// ptid
391	MOVW	R0, R7	// tls
392
393	// O32 syscall handler unconditionally copies arguments 5-8 from stack,
394	// even for syscalls with less than 8 arguments. Reserve 32 bytes of new
395	// stack so that any syscall invoked immediately in the new thread won't fail.
396	ADD	$-32, R5
397
398	// Copy mp, gp, fn off parent stack for use by child.
399	MOVW	mp+8(FP), R16
400	MOVW	gp+12(FP), R17
401	MOVW	fn+16(FP), R18
402
403	MOVW	$1234, R1
404
405	MOVW	R16, 0(R5)
406	MOVW	R17, 4(R5)
407	MOVW	R18, 8(R5)
408
409	MOVW	R1, 12(R5)
410
411	MOVW	$SYS_clone, R2
412	SYSCALL
413	BEQ	R7, 2(PC)
414	SUBU	R2, R0, R2	// caller expects negative errno
415
416	// In parent, return.
417	BEQ	R2, 3(PC)
418	MOVW	R2, ret+20(FP)
419	RET
420
421	// In child, on new stack.
422	// Check that SP is as we expect
423	NOP	R29	// tell vet R29/SP changed - stop checking offsets
424	MOVW	12(R29), R16
425	MOVW	$1234, R1
426	BEQ	R16, R1, 2(PC)
427	MOVW	(R0), R0
428
429	// Initialize m->procid to Linux tid
430	MOVW	$SYS_gettid, R2
431	SYSCALL
432
433	MOVW	0(R29), R16	// m
434	MOVW	4(R29), R17	// g
435	MOVW	8(R29), R18	// fn
436
437	BEQ	R16, nog
438	BEQ	R17, nog
439
440	MOVW	R2, m_procid(R16)
441
442	// In child, set up new stack
443	MOVW	R16, g_m(R17)
444	MOVW	R17, g
445
446// TODO(mips32): doesn't have runtime·stackcheck(SB)
447
448nog:
449	// Call fn
450	ADDU	$32, R29
451	JAL	(R18)
452
453	// It shouldn't return.	 If it does, exit that thread.
454	ADDU	$-32, R29
455	MOVW	$0xf4, R4
456	MOVW	$SYS_exit, R2
457	SYSCALL
458	UNDEF
459
460TEXT runtime·sigaltstack(SB),NOSPLIT,$0
461	MOVW	new+0(FP), R4
462	MOVW	old+4(FP), R5
463	MOVW	$SYS_sigaltstack, R2
464	SYSCALL
465	BEQ	R7, 2(PC)
466	UNDEF	// crash
467	RET
468
469TEXT runtime·osyield(SB),NOSPLIT,$0
470	MOVW	$SYS_sched_yield, R2
471	SYSCALL
472	RET
473
474TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0-16
475	MOVW	pid+0(FP), R4
476	MOVW	len+4(FP), R5
477	MOVW	buf+8(FP), R6
478	MOVW	$SYS_sched_getaffinity, R2
479	SYSCALL
480	BEQ	R7, 2(PC)
481	SUBU	R2, R0, R2	// caller expects negative errno
482	MOVW	R2, ret+12(FP)
483	RET
484
485// func sbrk0() uintptr
486TEXT runtime·sbrk0(SB),NOSPLIT,$0-4
487	// Implemented as brk(NULL).
488	MOVW	$0, R4
489	MOVW	$SYS_brk, R2
490	SYSCALL
491	MOVW	R2, ret+0(FP)
492	RET
493
494TEXT runtime·access(SB),$0-12
495	BREAK // unimplemented, only needed for android; declared in stubs_linux.go
496	MOVW	R0, ret+8(FP)	// for vet
497	RET
498
499TEXT runtime·connect(SB),$0-16
500	BREAK // unimplemented, only needed for android; declared in stubs_linux.go
501	MOVW	R0, ret+12(FP)	// for vet
502	RET
503
504TEXT runtime·socket(SB),$0-16
505	BREAK // unimplemented, only needed for android; declared in stubs_linux.go
506	MOVW	R0, ret+12(FP)	// for vet
507	RET
508