Text file
src/runtime/sys_netbsd_386.s
Documentation: runtime
1// Copyright 2009 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 386, 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 SYS_exit 1
17#define SYS_read 3
18#define SYS_write 4
19#define SYS_open 5
20#define SYS_close 6
21#define SYS_getpid 20
22#define SYS_kill 37
23#define SYS_munmap 73
24#define SYS_madvise 75
25#define SYS_fcntl 92
26#define SYS_mmap 197
27#define SYS___sysctl 202
28#define SYS___sigaltstack14 281
29#define SYS___sigprocmask14 293
30#define SYS_issetugid 305
31#define SYS_getcontext 307
32#define SYS_setcontext 308
33#define SYS__lwp_create 309
34#define SYS__lwp_exit 310
35#define SYS__lwp_self 311
36#define SYS__lwp_setprivate 317
37#define SYS__lwp_kill 318
38#define SYS__lwp_unpark 321
39#define SYS___sigaction_sigtramp 340
40#define SYS_kqueue 344
41#define SYS_sched_yield 350
42#define SYS___setitimer50 425
43#define SYS___clock_gettime50 427
44#define SYS___nanosleep50 430
45#define SYS___kevent50 435
46#define SYS____lwp_park60 478
47
48// Exit the entire program (like C exit)
49TEXT runtime·exit(SB),NOSPLIT,$-4
50 MOVL $SYS_exit, AX
51 INT $0x80
52 MOVL $0xf1, 0xf1 // crash
53 RET
54
55// func exitThread(wait *atomic.Uint32)
56TEXT runtime·exitThread(SB),NOSPLIT,$0-4
57 MOVL wait+0(FP), AX
58 // We're done using the stack.
59 MOVL $0, (AX)
60 MOVL $SYS__lwp_exit, AX
61 INT $0x80
62 MOVL $0xf1, 0xf1 // crash
63 JMP 0(PC)
64
65TEXT runtime·open(SB),NOSPLIT,$-4
66 MOVL $SYS_open, AX
67 INT $0x80
68 JAE 2(PC)
69 MOVL $-1, AX
70 MOVL AX, ret+12(FP)
71 RET
72
73TEXT runtime·closefd(SB),NOSPLIT,$-4
74 MOVL $SYS_close, AX
75 INT $0x80
76 JAE 2(PC)
77 MOVL $-1, AX
78 MOVL AX, ret+4(FP)
79 RET
80
81TEXT runtime·read(SB),NOSPLIT,$-4
82 MOVL $SYS_read, AX
83 INT $0x80
84 JAE 2(PC)
85 NEGL AX // caller expects negative errno
86 MOVL AX, ret+12(FP)
87 RET
88
89// func pipe2(flags int32) (r, w int32, errno int32)
90TEXT runtime·pipe2(SB),NOSPLIT,$12-16
91 MOVL $453, AX
92 LEAL r+4(FP), BX
93 MOVL BX, 4(SP)
94 MOVL flags+0(FP), BX
95 MOVL BX, 8(SP)
96 INT $0x80
97 MOVL AX, errno+12(FP)
98 RET
99
100TEXT runtime·write1(SB),NOSPLIT,$-4
101 MOVL $SYS_write, AX
102 INT $0x80
103 JAE 2(PC)
104 NEGL AX // caller expects negative errno
105 MOVL AX, ret+12(FP)
106 RET
107
108TEXT runtime·usleep(SB),NOSPLIT,$24
109 MOVL $0, DX
110 MOVL usec+0(FP), AX
111 MOVL $1000000, CX
112 DIVL CX
113 MOVL AX, 12(SP) // tv_sec - l32
114 MOVL $0, 16(SP) // tv_sec - h32
115 MOVL $1000, AX
116 MULL DX
117 MOVL AX, 20(SP) // tv_nsec
118
119 MOVL $0, 0(SP)
120 LEAL 12(SP), AX
121 MOVL AX, 4(SP) // arg 1 - rqtp
122 MOVL $0, 8(SP) // arg 2 - rmtp
123 MOVL $SYS___nanosleep50, AX
124 INT $0x80
125 RET
126
127TEXT runtime·lwp_kill(SB),NOSPLIT,$12-8
128 MOVL $0, 0(SP)
129 MOVL tid+0(FP), AX
130 MOVL AX, 4(SP) // arg 1 - target
131 MOVL sig+4(FP), AX
132 MOVL AX, 8(SP) // arg 2 - signo
133 MOVL $SYS__lwp_kill, AX
134 INT $0x80
135 RET
136
137TEXT runtime·raiseproc(SB),NOSPLIT,$12
138 MOVL $SYS_getpid, AX
139 INT $0x80
140 MOVL $0, 0(SP)
141 MOVL AX, 4(SP) // arg 1 - pid
142 MOVL sig+0(FP), AX
143 MOVL AX, 8(SP) // arg 2 - signo
144 MOVL $SYS_kill, AX
145 INT $0x80
146 RET
147
148TEXT runtime·mmap(SB),NOSPLIT,$36
149 LEAL addr+0(FP), SI
150 LEAL 4(SP), DI
151 CLD
152 MOVSL // arg 1 - addr
153 MOVSL // arg 2 - len
154 MOVSL // arg 3 - prot
155 MOVSL // arg 4 - flags
156 MOVSL // arg 5 - fd
157 MOVL $0, AX
158 STOSL // arg 6 - pad
159 MOVSL // arg 7 - offset
160 MOVL $0, AX // top 32 bits of file offset
161 STOSL
162 MOVL $SYS_mmap, AX
163 INT $0x80
164 JAE ok
165 MOVL $0, p+24(FP)
166 MOVL AX, err+28(FP)
167 RET
168ok:
169 MOVL AX, p+24(FP)
170 MOVL $0, err+28(FP)
171 RET
172
173TEXT runtime·munmap(SB),NOSPLIT,$-4
174 MOVL $SYS_munmap, AX
175 INT $0x80
176 JAE 2(PC)
177 MOVL $0xf1, 0xf1 // crash
178 RET
179
180TEXT runtime·madvise(SB),NOSPLIT,$-4
181 MOVL $SYS_madvise, AX
182 INT $0x80
183 JAE 2(PC)
184 MOVL $-1, AX
185 MOVL AX, ret+12(FP)
186 RET
187
188TEXT runtime·setitimer(SB),NOSPLIT,$-4
189 MOVL $SYS___setitimer50, AX
190 INT $0x80
191 RET
192
193// func walltime() (sec int64, nsec int32)
194TEXT runtime·walltime(SB), NOSPLIT, $32
195 LEAL 12(SP), BX
196 MOVL $CLOCK_REALTIME, 4(SP) // arg 1 - clock_id
197 MOVL BX, 8(SP) // arg 2 - tp
198 MOVL $SYS___clock_gettime50, AX
199 INT $0x80
200
201 MOVL 12(SP), AX // sec - l32
202 MOVL AX, sec_lo+0(FP)
203 MOVL 16(SP), AX // sec - h32
204 MOVL AX, sec_hi+4(FP)
205
206 MOVL 20(SP), BX // nsec
207 MOVL BX, nsec+8(FP)
208 RET
209
210// int64 nanotime1(void) so really
211// void nanotime1(int64 *nsec)
212TEXT runtime·nanotime1(SB),NOSPLIT,$32
213 LEAL 12(SP), BX
214 MOVL $CLOCK_MONOTONIC, 4(SP) // arg 1 - clock_id
215 MOVL BX, 8(SP) // arg 2 - tp
216 MOVL $SYS___clock_gettime50, AX
217 INT $0x80
218
219 MOVL 16(SP), CX // sec - h32
220 IMULL $1000000000, CX
221
222 MOVL 12(SP), AX // sec - l32
223 MOVL $1000000000, BX
224 MULL BX // result in dx:ax
225
226 MOVL 20(SP), BX // nsec
227 ADDL BX, AX
228 ADCL CX, DX // add high bits with carry
229
230 MOVL AX, ret_lo+0(FP)
231 MOVL DX, ret_hi+4(FP)
232 RET
233
234TEXT runtime·getcontext(SB),NOSPLIT,$-4
235 MOVL $SYS_getcontext, AX
236 INT $0x80
237 JAE 2(PC)
238 MOVL $0xf1, 0xf1 // crash
239 RET
240
241TEXT runtime·sigprocmask(SB),NOSPLIT,$-4
242 MOVL $SYS___sigprocmask14, AX
243 INT $0x80
244 JAE 2(PC)
245 MOVL $0xf1, 0xf1 // crash
246 RET
247
248TEXT sigreturn_tramp<>(SB),NOSPLIT,$0
249 LEAL 140(SP), AX // Load address of ucontext
250 MOVL AX, 4(SP)
251 MOVL $SYS_setcontext, AX
252 INT $0x80
253 MOVL $-1, 4(SP) // Something failed...
254 MOVL $SYS_exit, AX
255 INT $0x80
256
257TEXT runtime·sigaction(SB),NOSPLIT,$24
258 LEAL sig+0(FP), SI
259 LEAL 4(SP), DI
260 CLD
261 MOVSL // arg 1 - sig
262 MOVSL // arg 2 - act
263 MOVSL // arg 3 - oact
264 LEAL sigreturn_tramp<>(SB), AX
265 STOSL // arg 4 - tramp
266 MOVL $2, AX
267 STOSL // arg 5 - vers
268 MOVL $SYS___sigaction_sigtramp, AX
269 INT $0x80
270 JAE 2(PC)
271 MOVL $0xf1, 0xf1 // crash
272 RET
273
274TEXT runtime·sigfwd(SB),NOSPLIT,$12-16
275 MOVL fn+0(FP), AX
276 MOVL sig+4(FP), BX
277 MOVL info+8(FP), CX
278 MOVL ctx+12(FP), DX
279 MOVL SP, SI
280 SUBL $32, SP
281 ANDL $-15, SP // align stack: handler might be a C function
282 MOVL BX, 0(SP)
283 MOVL CX, 4(SP)
284 MOVL DX, 8(SP)
285 MOVL SI, 12(SP) // save SI: handler might be a Go function
286 CALL AX
287 MOVL 12(SP), AX
288 MOVL AX, SP
289 RET
290
291// Called by OS using C ABI.
292TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$28
293 NOP SP // tell vet SP changed - stop checking offsets
294 // Save callee-saved C registers, since the caller may be a C signal handler.
295 MOVL BX, bx-4(SP)
296 MOVL BP, bp-8(SP)
297 MOVL SI, si-12(SP)
298 MOVL DI, di-16(SP)
299 // We don't save mxcsr or the x87 control word because sigtrampgo doesn't
300 // modify them.
301
302 MOVL 32(SP), BX // signo
303 MOVL BX, 0(SP)
304 MOVL 36(SP), BX // info
305 MOVL BX, 4(SP)
306 MOVL 40(SP), BX // context
307 MOVL BX, 8(SP)
308 CALL runtime·sigtrampgo(SB)
309
310 MOVL di-16(SP), DI
311 MOVL si-12(SP), SI
312 MOVL bp-8(SP), BP
313 MOVL bx-4(SP), BX
314 RET
315
316// int32 lwp_create(void *context, uintptr flags, void *lwpid);
317TEXT runtime·lwp_create(SB),NOSPLIT,$16
318 MOVL $0, 0(SP)
319 MOVL ctxt+0(FP), AX
320 MOVL AX, 4(SP) // arg 1 - context
321 MOVL flags+4(FP), AX
322 MOVL AX, 8(SP) // arg 2 - flags
323 MOVL lwpid+8(FP), AX
324 MOVL AX, 12(SP) // arg 3 - lwpid
325 MOVL $SYS__lwp_create, AX
326 INT $0x80
327 JCC 2(PC)
328 NEGL AX
329 MOVL AX, ret+12(FP)
330 RET
331
332TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
333
334 // Set FS to point at m->tls
335 LEAL m_tls(BX), BP
336 PUSHAL // save registers
337 PUSHL BP
338 CALL lwp_setprivate<>(SB)
339 POPL AX
340 POPAL
341
342 // Now segment is established. Initialize m, g.
343 get_tls(AX)
344 MOVL DX, g(AX)
345 MOVL BX, g_m(DX)
346
347 CALL runtime·stackcheck(SB) // smashes AX, CX
348 MOVL 0(DX), DX // paranoia; check they are not nil
349 MOVL 0(BX), BX
350
351 // more paranoia; check that stack splitting code works
352 PUSHAL
353 CALL runtime·emptyfunc(SB)
354 POPAL
355
356 // Call fn
357 CALL SI
358
359 // fn should never return
360 MOVL $0x1234, 0x1005
361 RET
362
363TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
364 CALL ·netbsdMstart0(SB)
365 RET // not reached
366
367TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
368 MOVL $SYS___sigaltstack14, AX
369 MOVL new+0(FP), BX
370 MOVL old+4(FP), CX
371 INT $0x80
372 CMPL AX, $0xfffff001
373 JLS 2(PC)
374 INT $3
375 RET
376
377TEXT runtime·setldt(SB),NOSPLIT,$8
378 // Under NetBSD we set the GS base instead of messing with the LDT.
379 MOVL base+4(FP), AX
380 MOVL AX, 0(SP)
381 CALL lwp_setprivate<>(SB)
382 RET
383
384TEXT lwp_setprivate<>(SB),NOSPLIT,$16
385 // adjust for ELF: wants to use -4(GS) for g
386 MOVL base+0(FP), CX
387 ADDL $4, CX
388 MOVL $0, 0(SP) // syscall gap
389 MOVL CX, 4(SP) // arg 1 - ptr
390 MOVL $SYS__lwp_setprivate, AX
391 INT $0x80
392 JCC 2(PC)
393 MOVL $0xf1, 0xf1 // crash
394 RET
395
396TEXT runtime·osyield(SB),NOSPLIT,$-4
397 MOVL $SYS_sched_yield, AX
398 INT $0x80
399 RET
400
401TEXT runtime·lwp_park(SB),NOSPLIT,$-4
402 MOVL $SYS____lwp_park60, AX
403 INT $0x80
404 MOVL AX, ret+24(FP)
405 RET
406
407TEXT runtime·lwp_unpark(SB),NOSPLIT,$-4
408 MOVL $SYS__lwp_unpark, AX
409 INT $0x80
410 MOVL AX, ret+8(FP)
411 RET
412
413TEXT runtime·lwp_self(SB),NOSPLIT,$-4
414 MOVL $SYS__lwp_self, AX
415 INT $0x80
416 MOVL AX, ret+0(FP)
417 RET
418
419TEXT runtime·sysctl(SB),NOSPLIT,$28
420 LEAL mib+0(FP), SI
421 LEAL 4(SP), DI
422 CLD
423 MOVSL // arg 1 - name
424 MOVSL // arg 2 - namelen
425 MOVSL // arg 3 - oldp
426 MOVSL // arg 4 - oldlenp
427 MOVSL // arg 5 - newp
428 MOVSL // arg 6 - newlen
429 MOVL $SYS___sysctl, AX
430 INT $0x80
431 JAE 4(PC)
432 NEGL AX
433 MOVL AX, ret+24(FP)
434 RET
435 MOVL $0, AX
436 MOVL AX, ret+24(FP)
437 RET
438
439GLOBL runtime·tlsoffset(SB),NOPTR,$4
440
441// int32 runtime·kqueue(void)
442TEXT runtime·kqueue(SB),NOSPLIT,$0
443 MOVL $SYS_kqueue, AX
444 INT $0x80
445 JAE 2(PC)
446 NEGL AX
447 MOVL AX, ret+0(FP)
448 RET
449
450// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
451TEXT runtime·kevent(SB),NOSPLIT,$0
452 MOVL $SYS___kevent50, AX
453 INT $0x80
454 JAE 2(PC)
455 NEGL AX
456 MOVL AX, ret+24(FP)
457 RET
458
459// func fcntl(fd, cmd, arg int32) (int32, int32)
460TEXT runtime·fcntl(SB),NOSPLIT,$-4
461 MOVL $SYS_fcntl, AX
462 INT $0x80
463 JAE noerr
464 MOVL $-1, ret+12(FP)
465 MOVL AX, errno+16(FP)
466 RET
467noerr:
468 MOVL AX, ret+12(FP)
469 MOVL $0, errno+16(FP)
470 RET
471
472// func issetugid() int32
473TEXT runtime·issetugid(SB),NOSPLIT,$0
474 MOVL $SYS_issetugid, AX
475 INT $0x80
476 MOVL AX, ret+0(FP)
477 RET
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