Text file
src/runtime/sys_freebsd_386.s
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, FreeBSD
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 4
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_sigaltstack 53
24 #define SYS_munmap 73
25 #define SYS_madvise 75
26 #define SYS_setitimer 83
27 #define SYS_fcntl 92
28 #define SYS_sysarch 165
29 #define SYS___sysctl 202
30 #define SYS_clock_gettime 232
31 #define SYS_nanosleep 240
32 #define SYS_issetugid 253
33 #define SYS_sched_yield 331
34 #define SYS_sigprocmask 340
35 #define SYS_kqueue 362
36 #define SYS_sigaction 416
37 #define SYS_sigreturn 417
38 #define SYS_thr_exit 431
39 #define SYS_thr_self 432
40 #define SYS_thr_kill 433
41 #define SYS__umtx_op 454
42 #define SYS_thr_new 455
43 #define SYS_mmap 477
44 #define SYS_cpuset_getaffinity 487
45 #define SYS_pipe2 542
46 #define SYS_kevent 560
47
48 TEXT runtime·sys_umtx_op(SB),NOSPLIT,$-4
49 MOVL $SYS__umtx_op, AX
50 INT $0x80
51 JAE 2(PC)
52 NEGL AX
53 MOVL AX, ret+20(FP)
54 RET
55
56 TEXT runtime·thr_new(SB),NOSPLIT,$-4
57 MOVL $SYS_thr_new, AX
58 INT $0x80
59 JAE 2(PC)
60 NEGL AX
61 MOVL AX, ret+8(FP)
62 RET
63
64 // Called by OS using C ABI.
65 TEXT runtime·thr_start(SB),NOSPLIT,$0
66 NOP SP // tell vet SP changed - stop checking offsets
67 MOVL 4(SP), AX // m
68 MOVL m_g0(AX), BX
69 LEAL m_tls(AX), BP
70 MOVL m_id(AX), DI
71 ADDL $7, DI
72 PUSHAL
73 PUSHL $32
74 PUSHL BP
75 PUSHL DI
76 CALL runtime·setldt(SB)
77 POPL AX
78 POPL AX
79 POPL AX
80 POPAL
81 get_tls(CX)
82 MOVL BX, g(CX)
83
84 MOVL AX, g_m(BX)
85 CALL runtime·stackcheck(SB) // smashes AX
86 CALL runtime·mstart(SB)
87
88 MOVL 0, AX // crash (not reached)
89
90 // Exit the entire program (like C exit)
91 TEXT runtime·exit(SB),NOSPLIT,$-4
92 MOVL $SYS_exit, AX
93 INT $0x80
94 MOVL $0xf1, 0xf1 // crash
95 RET
96
97 GLOBL exitStack<>(SB),RODATA,$8
98 DATA exitStack<>+0x00(SB)/4, $0
99 DATA exitStack<>+0x04(SB)/4, $0
100
101 // func exitThread(wait *atomic.Uint32)
102 TEXT runtime·exitThread(SB),NOSPLIT,$0-4
103 MOVL wait+0(FP), AX
104 // We're done using the stack.
105 MOVL $0, (AX)
106 // thr_exit takes a single pointer argument, which it expects
107 // on the stack. We want to pass 0, so switch over to a fake
108 // stack of 0s. It won't write to the stack.
109 MOVL $exitStack<>(SB), SP
110 MOVL $SYS_thr_exit, AX
111 INT $0x80
112 MOVL $0xf1, 0xf1 // crash
113 JMP 0(PC)
114
115 TEXT runtime·open(SB),NOSPLIT,$-4
116 MOVL $SYS_open, AX
117 INT $0x80
118 JAE 2(PC)
119 MOVL $-1, AX
120 MOVL AX, ret+12(FP)
121 RET
122
123 TEXT runtime·closefd(SB),NOSPLIT,$-4
124 MOVL $SYS_close, AX
125 INT $0x80
126 JAE 2(PC)
127 MOVL $-1, AX
128 MOVL AX, ret+4(FP)
129 RET
130
131 TEXT runtime·read(SB),NOSPLIT,$-4
132 MOVL $SYS_read, AX
133 INT $0x80
134 JAE 2(PC)
135 NEGL AX // caller expects negative errno
136 MOVL AX, ret+12(FP)
137 RET
138
139 // func pipe2(flags int32) (r, w int32, errno int32)
140 TEXT runtime·pipe2(SB),NOSPLIT,$12-16
141 MOVL $SYS_pipe2, AX
142 LEAL r+4(FP), BX
143 MOVL BX, 4(SP)
144 MOVL flags+0(FP), BX
145 MOVL BX, 8(SP)
146 INT $0x80
147 JAE 2(PC)
148 NEGL AX
149 MOVL AX, errno+12(FP)
150 RET
151
152 TEXT runtime·write1(SB),NOSPLIT,$-4
153 MOVL $SYS_write, AX
154 INT $0x80
155 JAE 2(PC)
156 NEGL AX // caller expects negative errno
157 MOVL AX, ret+12(FP)
158 RET
159
160 TEXT runtime·thr_self(SB),NOSPLIT,$8-4
161 // thr_self(&0(FP))
162 LEAL ret+0(FP), AX
163 MOVL AX, 4(SP)
164 MOVL $SYS_thr_self, AX
165 INT $0x80
166 RET
167
168 TEXT runtime·thr_kill(SB),NOSPLIT,$-4
169 // thr_kill(tid, sig)
170 MOVL $SYS_thr_kill, AX
171 INT $0x80
172 RET
173
174 TEXT runtime·raiseproc(SB),NOSPLIT,$16
175 // getpid
176 MOVL $SYS_getpid, AX
177 INT $0x80
178 // kill(self, sig)
179 MOVL AX, 4(SP)
180 MOVL sig+0(FP), AX
181 MOVL AX, 8(SP)
182 MOVL $SYS_kill, AX
183 INT $0x80
184 RET
185
186 TEXT runtime·mmap(SB),NOSPLIT,$32
187 LEAL addr+0(FP), SI
188 LEAL 4(SP), DI
189 CLD
190 MOVSL
191 MOVSL
192 MOVSL
193 MOVSL
194 MOVSL
195 MOVSL
196 MOVL $0, AX // top 32 bits of file offset
197 STOSL
198 MOVL $SYS_mmap, AX
199 INT $0x80
200 JAE ok
201 MOVL $0, p+24(FP)
202 MOVL AX, err+28(FP)
203 RET
204 ok:
205 MOVL AX, p+24(FP)
206 MOVL $0, err+28(FP)
207 RET
208
209 TEXT runtime·munmap(SB),NOSPLIT,$-4
210 MOVL $SYS_munmap, AX
211 INT $0x80
212 JAE 2(PC)
213 MOVL $0xf1, 0xf1 // crash
214 RET
215
216 TEXT runtime·madvise(SB),NOSPLIT,$-4
217 MOVL $SYS_madvise, AX
218 INT $0x80
219 JAE 2(PC)
220 MOVL $-1, AX
221 MOVL AX, ret+12(FP)
222 RET
223
224 TEXT runtime·setitimer(SB), NOSPLIT, $-4
225 MOVL $SYS_setitimer, AX
226 INT $0x80
227 RET
228
229 // func fallback_walltime() (sec int64, nsec int32)
230 TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12
231 MOVL $SYS_clock_gettime, AX
232 LEAL 12(SP), BX
233 MOVL $CLOCK_REALTIME, 4(SP)
234 MOVL BX, 8(SP)
235 INT $0x80
236 MOVL 12(SP), AX // sec
237 MOVL 16(SP), BX // nsec
238
239 // sec is in AX, nsec in BX
240 MOVL AX, sec_lo+0(FP)
241 MOVL $0, sec_hi+4(FP)
242 MOVL BX, nsec+8(FP)
243 RET
244
245 // func fallback_nanotime() int64
246 TEXT runtime·fallback_nanotime(SB), NOSPLIT, $32-8
247 MOVL $SYS_clock_gettime, AX
248 LEAL 12(SP), BX
249 MOVL $CLOCK_MONOTONIC, 4(SP)
250 MOVL BX, 8(SP)
251 INT $0x80
252 MOVL 12(SP), AX // sec
253 MOVL 16(SP), BX // nsec
254
255 // sec is in AX, nsec in BX
256 // convert to DX:AX nsec
257 MOVL $1000000000, CX
258 MULL CX
259 ADDL BX, AX
260 ADCL $0, DX
261
262 MOVL AX, ret_lo+0(FP)
263 MOVL DX, ret_hi+4(FP)
264 RET
265
266
267 TEXT runtime·asmSigaction(SB),NOSPLIT,$-4
268 MOVL $SYS_sigaction, AX
269 INT $0x80
270 MOVL AX, ret+12(FP)
271 RET
272
273 TEXT runtime·sigfwd(SB),NOSPLIT,$12-16
274 MOVL fn+0(FP), AX
275 MOVL sig+4(FP), BX
276 MOVL info+8(FP), CX
277 MOVL ctx+12(FP), DX
278 MOVL SP, SI
279 SUBL $32, SP
280 ANDL $~15, SP // align stack: handler might be a C function
281 MOVL BX, 0(SP)
282 MOVL CX, 4(SP)
283 MOVL DX, 8(SP)
284 MOVL SI, 12(SP) // save SI: handler might be a Go function
285 CALL AX
286 MOVL 12(SP), AX
287 MOVL AX, SP
288 RET
289
290 // Called by OS using C ABI.
291 TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$12
292 NOP SP // tell vet SP changed - stop checking offsets
293 MOVL 16(SP), BX // signo
294 MOVL BX, 0(SP)
295 MOVL 20(SP), BX // info
296 MOVL BX, 4(SP)
297 MOVL 24(SP), BX // context
298 MOVL BX, 8(SP)
299 CALL runtime·sigtrampgo(SB)
300
301 // call sigreturn
302 MOVL 24(SP), AX // context
303 MOVL $0, 0(SP) // syscall gap
304 MOVL AX, 4(SP)
305 MOVL $SYS_sigreturn, AX
306 INT $0x80
307 MOVL $0xf1, 0xf1 // crash
308 RET
309
310 TEXT runtime·sigaltstack(SB),NOSPLIT,$0
311 MOVL $SYS_sigaltstack, AX
312 INT $0x80
313 JAE 2(PC)
314 MOVL $0xf1, 0xf1 // crash
315 RET
316
317 TEXT runtime·usleep(SB),NOSPLIT,$20
318 MOVL $0, DX
319 MOVL usec+0(FP), AX
320 MOVL $1000000, CX
321 DIVL CX
322 MOVL AX, 12(SP) // tv_sec
323 MOVL $1000, AX
324 MULL DX
325 MOVL AX, 16(SP) // tv_nsec
326
327 MOVL $0, 0(SP)
328 LEAL 12(SP), AX
329 MOVL AX, 4(SP) // arg 1 - rqtp
330 MOVL $0, 8(SP) // arg 2 - rmtp
331 MOVL $SYS_nanosleep, AX
332 INT $0x80
333 RET
334
335 /*
336 descriptor entry format for system call
337 is the native machine format, ugly as it is:
338
339 2-byte limit
340 3-byte base
341 1-byte: 0x80=present, 0x60=dpl<<5, 0x1F=type
342 1-byte: 0x80=limit is *4k, 0x40=32-bit operand size,
343 0x0F=4 more bits of limit
344 1 byte: 8 more bits of base
345
346 int i386_get_ldt(int, union ldt_entry *, int);
347 int i386_set_ldt(int, const union ldt_entry *, int);
348
349 */
350
351 // setldt(int entry, int address, int limit)
352 TEXT runtime·setldt(SB),NOSPLIT,$32
353 MOVL base+4(FP), BX
354 // see comment in sys_linux_386.s; freebsd is similar
355 ADDL $0x4, BX
356
357 // set up data_desc
358 LEAL 16(SP), AX // struct data_desc
359 MOVL $0, 0(AX)
360 MOVL $0, 4(AX)
361
362 MOVW BX, 2(AX)
363 SHRL $16, BX
364 MOVB BX, 4(AX)
365 SHRL $8, BX
366 MOVB BX, 7(AX)
367
368 MOVW $0xffff, 0(AX)
369 MOVB $0xCF, 6(AX) // 32-bit operand, 4k limit unit, 4 more bits of limit
370
371 MOVB $0xF2, 5(AX) // r/w data descriptor, dpl=3, present
372
373 // call i386_set_ldt(entry, desc, 1)
374 MOVL $0xffffffff, 0(SP) // auto-allocate entry and return in AX
375 MOVL AX, 4(SP)
376 MOVL $1, 8(SP)
377 CALL i386_set_ldt<>(SB)
378
379 // compute segment selector - (entry*8+7)
380 SHLL $3, AX
381 ADDL $7, AX
382 MOVW AX, GS
383 RET
384
385 TEXT i386_set_ldt<>(SB),NOSPLIT,$16
386 LEAL args+0(FP), AX // 0(FP) == 4(SP) before SP got moved
387 MOVL $0, 0(SP) // syscall gap
388 MOVL $1, 4(SP)
389 MOVL AX, 8(SP)
390 MOVL $SYS_sysarch, AX
391 INT $0x80
392 JAE 2(PC)
393 INT $3
394 RET
395
396 TEXT runtime·sysctl(SB),NOSPLIT,$28
397 LEAL mib+0(FP), SI
398 LEAL 4(SP), DI
399 CLD
400 MOVSL // arg 1 - name
401 MOVSL // arg 2 - namelen
402 MOVSL // arg 3 - oldp
403 MOVSL // arg 4 - oldlenp
404 MOVSL // arg 5 - newp
405 MOVSL // arg 6 - newlen
406 MOVL $SYS___sysctl, AX
407 INT $0x80
408 JAE 4(PC)
409 NEGL AX
410 MOVL AX, ret+24(FP)
411 RET
412 MOVL $0, AX
413 MOVL AX, ret+24(FP)
414 RET
415
416 TEXT runtime·osyield(SB),NOSPLIT,$-4
417 MOVL $SYS_sched_yield, AX
418 INT $0x80
419 RET
420
421 TEXT runtime·sigprocmask(SB),NOSPLIT,$16
422 MOVL $0, 0(SP) // syscall gap
423 MOVL how+0(FP), AX // arg 1 - how
424 MOVL AX, 4(SP)
425 MOVL new+4(FP), AX
426 MOVL AX, 8(SP) // arg 2 - set
427 MOVL old+8(FP), AX
428 MOVL AX, 12(SP) // arg 3 - oset
429 MOVL $SYS_sigprocmask, AX
430 INT $0x80
431 JAE 2(PC)
432 MOVL $0xf1, 0xf1 // crash
433 RET
434
435 // int32 runtime·kqueue(void);
436 TEXT runtime·kqueue(SB),NOSPLIT,$0
437 MOVL $SYS_kqueue, AX
438 INT $0x80
439 JAE 2(PC)
440 NEGL AX
441 MOVL AX, ret+0(FP)
442 RET
443
444 // int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
445 TEXT runtime·kevent(SB),NOSPLIT,$0
446 MOVL $SYS_kevent, AX
447 INT $0x80
448 JAE 2(PC)
449 NEGL AX
450 MOVL AX, ret+24(FP)
451 RET
452
453 // func fcntl(fd, cmd, arg int32) (int32, int32)
454 TEXT runtime·fcntl(SB),NOSPLIT,$-4
455 MOVL $SYS_fcntl, AX
456 INT $0x80
457 JAE noerr
458 MOVL $-1, ret+12(FP)
459 MOVL AX, errno+16(FP)
460 RET
461 noerr:
462 MOVL AX, ret+12(FP)
463 MOVL $0, errno+16(FP)
464 RET
465
466 // func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32
467 TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28
468 MOVL $SYS_cpuset_getaffinity, AX
469 INT $0x80
470 JAE 2(PC)
471 NEGL AX
472 MOVL AX, ret+24(FP)
473 RET
474
475 GLOBL runtime·tlsoffset(SB),NOPTR,$4
476
477 // func issetugid() int32
478 TEXT runtime·issetugid(SB),NOSPLIT,$0
479 MOVL $SYS_issetugid, AX
480 INT $0x80
481 MOVL AX, ret+0(FP)
482 RET
483
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