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
| // Copyright 2016 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 system stuff for Linux s390x; see
| // /usr/include/asm/unistd.h for the syscall number definitions.
|
| #include "go_asm.h"
| #include "go_tls.h"
| #include "textflag.h"
|
| #define SYS_exit 1
| #define SYS_read 3
| #define SYS_write 4
| #define SYS_open 5
| #define SYS_close 6
| #define SYS_getpid 20
| #define SYS_kill 37
| #define SYS_brk 45
| #define SYS_fcntl 55
| #define SYS_mmap 90
| #define SYS_munmap 91
| #define SYS_setitimer 104
| #define SYS_clone 120
| #define SYS_sched_yield 158
| #define SYS_nanosleep 162
| #define SYS_rt_sigreturn 173
| #define SYS_rt_sigaction 174
| #define SYS_rt_sigprocmask 175
| #define SYS_sigaltstack 186
| #define SYS_madvise 219
| #define SYS_mincore 218
| #define SYS_gettid 236
| #define SYS_futex 238
| #define SYS_sched_getaffinity 240
| #define SYS_tgkill 241
| #define SYS_exit_group 248
| #define SYS_epoll_create 249
| #define SYS_epoll_ctl 250
| #define SYS_epoll_wait 251
| #define SYS_clock_gettime 260
| #define SYS_epoll_create1 327
|
| TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
| MOVW code+0(FP), R2
| MOVW $SYS_exit_group, R1
| SYSCALL
| RET
|
| // func exitThread(wait *uint32)
| TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
| MOVD wait+0(FP), R1
| // We're done using the stack.
| MOVW $0, R2
| MOVW R2, (R1)
| MOVW $0, R2 // exit code
| MOVW $SYS_exit, R1
| SYSCALL
| JMP 0(PC)
|
| TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
| MOVD name+0(FP), R2
| MOVW mode+8(FP), R3
| MOVW perm+12(FP), R4
| MOVW $SYS_open, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVW $-1, R2
| MOVW R2, ret+16(FP)
| RET
|
| TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
| MOVW fd+0(FP), R2
| MOVW $SYS_close, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVW $-1, R2
| MOVW R2, ret+8(FP)
| RET
|
| TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0-28
| MOVD fd+0(FP), R2
| MOVD p+8(FP), R3
| MOVW n+16(FP), R4
| MOVW $SYS_write, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVW $-1, R2
| MOVW R2, ret+24(FP)
| RET
|
| TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
| MOVW fd+0(FP), R2
| MOVD p+8(FP), R3
| MOVW n+16(FP), R4
| MOVW $SYS_read, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVW $-1, R2
| MOVW R2, ret+24(FP)
| RET
|
| TEXT runtime·usleep(SB),NOSPLIT,$16-4
| MOVW usec+0(FP), R2
| MOVD R2, R4
| MOVW $1000000, R3
| DIVD R3, R2
| MOVD R2, 8(R15)
| MOVW $1000, R3
| MULLD R2, R3
| SUB R3, R4
| MOVD R4, 16(R15)
|
| // nanosleep(&ts, 0)
| ADD $8, R15, R2
| MOVW $0, R3
| MOVW $SYS_nanosleep, R1
| SYSCALL
| RET
|
| TEXT runtime·gettid(SB),NOSPLIT,$0-4
| MOVW $SYS_gettid, R1
| SYSCALL
| MOVW R2, ret+0(FP)
| RET
|
| TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
| MOVW $SYS_getpid, R1
| SYSCALL
| MOVW R2, R10
| MOVW $SYS_gettid, R1
| SYSCALL
| MOVW R2, R3 // arg 2 tid
| MOVW R10, R2 // arg 1 pid
| MOVW sig+0(FP), R4 // arg 2
| MOVW $SYS_tgkill, R1
| SYSCALL
| RET
|
| TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
| MOVW $SYS_getpid, R1
| SYSCALL
| MOVW R2, R2 // arg 1 pid
| MOVW sig+0(FP), R3 // arg 2
| MOVW $SYS_kill, R1
| SYSCALL
| RET
|
| TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
| MOVW mode+0(FP), R2
| MOVD new+8(FP), R3
| MOVD old+16(FP), R4
| MOVW $SYS_setitimer, R1
| SYSCALL
| RET
|
| TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
| MOVD addr+0(FP), R2
| MOVD n+8(FP), R3
| MOVD dst+16(FP), R4
| MOVW $SYS_mincore, R1
| SYSCALL
| MOVW R2, ret+24(FP)
| RET
|
| // func walltime() (sec int64, nsec int32)
| TEXT runtime·walltime(SB),NOSPLIT,$16
| MOVW $0, R2 // CLOCK_REALTIME
| MOVD $tp-16(SP), R3
| MOVW $SYS_clock_gettime, R1
| SYSCALL
| LMG tp-16(SP), R2, R3
| // sec is in R2, nsec in R3
| MOVD R2, sec+0(FP)
| MOVW R3, nsec+8(FP)
| RET
|
| TEXT runtime·nanotime(SB),NOSPLIT,$16
| MOVW $1, R2 // CLOCK_MONOTONIC
| MOVD $tp-16(SP), R3
| MOVW $SYS_clock_gettime, R1
| SYSCALL
| LMG tp-16(SP), R2, R3
| // sec is in R2, nsec in R3
| // return nsec in R2
| MULLD $1000000000, R2
| ADD R3, R2
| MOVD R2, ret+0(FP)
| RET
|
| TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
| MOVW how+0(FP), R2
| MOVD new+8(FP), R3
| MOVD old+16(FP), R4
| MOVW size+24(FP), R5
| MOVW $SYS_rt_sigprocmask, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVD R0, 0(R0) // crash
| RET
|
| TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
| MOVD sig+0(FP), R2
| MOVD new+8(FP), R3
| MOVD old+16(FP), R4
| MOVD size+24(FP), R5
| MOVW $SYS_rt_sigaction, R1
| SYSCALL
| MOVW R2, ret+32(FP)
| RET
|
| TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
| MOVW sig+8(FP), R2
| MOVD info+16(FP), R3
| MOVD ctx+24(FP), R4
| MOVD fn+0(FP), R5
| BL R5
| RET
|
| TEXT runtime·sigtramp(SB),NOSPLIT,$64
| // initialize essential registers (just in case)
| XOR R0, R0
|
| // this might be called in external code context,
| // where g is not set.
| MOVB runtime·iscgo(SB), R6
| CMPBEQ R6, $0, 2(PC)
| BL runtime·load_g(SB)
|
| MOVW R2, 8(R15)
| MOVD R3, 16(R15)
| MOVD R4, 24(R15)
| MOVD $runtime·sigtrampgo(SB), R5
| BL R5
| RET
|
| TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
| BR runtime·sigtramp(SB)
|
| // func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) unsafe.Pointer
| TEXT runtime·mmap(SB),NOSPLIT,$48-48
| MOVD addr+0(FP), R2
| MOVD n+8(FP), R3
| MOVW prot+16(FP), R4
| MOVW flags+20(FP), R5
| MOVW fd+24(FP), R6
| MOVWZ off+28(FP), R7
|
| // s390x uses old_mmap, so the arguments need to be placed into
| // a struct and a pointer to the struct passed to mmap.
| MOVD R2, addr-48(SP)
| MOVD R3, n-40(SP)
| MOVD R4, prot-32(SP)
| MOVD R5, flags-24(SP)
| MOVD R6, fd-16(SP)
| MOVD R7, off-8(SP)
|
| MOVD $addr-48(SP), R2
| MOVW $SYS_mmap, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, ok
| NEG R2
| MOVD $0, p+32(FP)
| MOVD R2, err+40(FP)
| RET
| ok:
| MOVD R2, p+32(FP)
| MOVD $0, err+40(FP)
| RET
|
| TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
| MOVD addr+0(FP), R2
| MOVD n+8(FP), R3
| MOVW $SYS_munmap, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVD R0, 0(R0) // crash
| RET
|
| TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
| MOVD addr+0(FP), R2
| MOVD n+8(FP), R3
| MOVW flags+16(FP), R4
| MOVW $SYS_madvise, R1
| SYSCALL
| MOVW R2, ret+24(FP)
| RET
|
| // int64 futex(int32 *uaddr, int32 op, int32 val,
| // struct timespec *timeout, int32 *uaddr2, int32 val2);
| TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
| MOVD addr+0(FP), R2
| MOVW op+8(FP), R3
| MOVW val+12(FP), R4
| MOVD ts+16(FP), R5
| MOVD addr2+24(FP), R6
| MOVW val3+32(FP), R7
| MOVW $SYS_futex, R1
| SYSCALL
| MOVW R2, ret+40(FP)
| RET
|
| // int32 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
| TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
| MOVW flags+0(FP), R3
| MOVD stk+8(FP), R2
|
| // Copy mp, gp, fn off parent stack for use by child.
| // Careful: Linux system call clobbers ???.
| MOVD mp+16(FP), R7
| MOVD gp+24(FP), R8
| MOVD fn+32(FP), R9
|
| MOVD R7, -8(R2)
| MOVD R8, -16(R2)
| MOVD R9, -24(R2)
| MOVD $1234, R7
| MOVD R7, -32(R2)
|
| SYSCALL $SYS_clone
|
| // In parent, return.
| CMPBEQ R2, $0, 3(PC)
| MOVW R2, ret+40(FP)
| RET
|
| // In child, on new stack.
| // initialize essential registers
| XOR R0, R0
| MOVD -32(R15), R7
| CMP R7, $1234
| BEQ 2(PC)
| MOVD R0, 0(R0)
|
| // Initialize m->procid to Linux tid
| SYSCALL $SYS_gettid
|
| MOVD -24(R15), R9 // fn
| MOVD -16(R15), R8 // g
| MOVD -8(R15), R7 // m
|
| CMPBEQ R7, $0, nog
| CMP R8, $0
| BEQ nog
|
| MOVD R2, m_procid(R7)
|
| // In child, set up new stack
| MOVD R7, g_m(R8)
| MOVD R8, g
| //CALL runtime·stackcheck(SB)
|
| nog:
| // Call fn
| BL R9
|
| // It shouldn't return. If it does, exit that thread.
| MOVW $111, R2
| MOVW $SYS_exit, R1
| SYSCALL
| BR -2(PC) // keep exiting
|
| TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
| MOVD new+0(FP), R2
| MOVD old+8(FP), R3
| MOVW $SYS_sigaltstack, R1
| SYSCALL
| MOVD $-4095, R3
| CMPUBLT R2, R3, 2(PC)
| MOVD R0, 0(R0) // crash
| RET
|
| TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
| MOVW $SYS_sched_yield, R1
| SYSCALL
| RET
|
| TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
| MOVD pid+0(FP), R2
| MOVD len+8(FP), R3
| MOVD buf+16(FP), R4
| MOVW $SYS_sched_getaffinity, R1
| SYSCALL
| MOVW R2, ret+24(FP)
| RET
|
| // int32 runtime·epollcreate(int32 size);
| TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
| MOVW size+0(FP), R2
| MOVW $SYS_epoll_create, R1
| SYSCALL
| MOVW R2, ret+8(FP)
| RET
|
| // int32 runtime·epollcreate1(int32 flags);
| TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
| MOVW flags+0(FP), R2
| MOVW $SYS_epoll_create1, R1
| SYSCALL
| MOVW R2, ret+8(FP)
| RET
|
| // func epollctl(epfd, op, fd int32, ev *epollEvent) int
| TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
| MOVW epfd+0(FP), R2
| MOVW op+4(FP), R3
| MOVW fd+8(FP), R4
| MOVD ev+16(FP), R5
| MOVW $SYS_epoll_ctl, R1
| SYSCALL
| MOVW R2, ret+24(FP)
| RET
|
| // int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
| TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
| MOVW epfd+0(FP), R2
| MOVD ev+8(FP), R3
| MOVW nev+16(FP), R4
| MOVW timeout+20(FP), R5
| MOVW $SYS_epoll_wait, R1
| SYSCALL
| MOVW R2, ret+24(FP)
| RET
|
| // void runtime·closeonexec(int32 fd);
| TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
| MOVW fd+0(FP), R2 // fd
| MOVD $2, R3 // F_SETFD
| MOVD $1, R4 // FD_CLOEXEC
| MOVW $SYS_fcntl, R1
| SYSCALL
| RET
|
| // func sbrk0() uintptr
| TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
| // Implemented as brk(NULL).
| MOVD $0, R2
| MOVW $SYS_brk, R1
| SYSCALL
| MOVD R2, ret+0(FP)
| RET
|
|
