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
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
|
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995 - 2000, 2001 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2001 MIPS Technologies, Inc.
* Copyright (C) 2004 Thiemo Seufer
*
* Hairy, the userspace application uses a different argument passing
* convention than the kernel, so we have to translate things from o32
* to ABI64 calling convention. 64-bit syscalls are also processed
* here for now.
*/
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/irqflags.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/sysmips.h>
.align 5
NESTED(handle_sys, PT_SIZE, sp)
.set noat
SAVE_SOME
TRACE_IRQS_ON_RELOAD
STI
.set at
ld t1, PT_EPC(sp) # skip syscall on return
dsubu t0, v0, __NR_O32_Linux # check syscall number
sltiu t0, t0, __NR_O32_Linux_syscalls + 1
daddiu t1, 4 # skip to next instruction
sd t1, PT_EPC(sp)
beqz t0, not_o32_scall
#if 0
SAVE_ALL
move a1, v0
PRINT("Scall %ld\n")
RESTORE_ALL
#endif
/* We don't want to stumble over broken sign extensions from
userland. O32 does never use the upper half. */
sll a0, a0, 0
sll a1, a1, 0
sll a2, a2, 0
sll a3, a3, 0
dsll t0, v0, 3 # offset into table
ld t2, (sys_call_table - (__NR_O32_Linux * 8))(t0)
sd a3, PT_R26(sp) # save a3 for syscall restarting
/*
* More than four arguments. Try to deal with it by copying the
* stack arguments from the user stack to the kernel stack.
* This Sucks (TM).
*
* We intentionally keep the kernel stack a little below the top of
* userspace so we don't have to do a slower byte accurate check here.
*/
ld t0, PT_R29(sp) # get old user stack pointer
daddu t1, t0, 32
bltz t1, bad_stack
1: lw a4, 16(t0) # argument #5 from usp
2: lw a5, 20(t0) # argument #6 from usp
3: lw a6, 24(t0) # argument #7 from usp
4: lw a7, 28(t0) # argument #8 from usp (for indirect syscalls)
.section __ex_table,"a"
PTR 1b, bad_stack
PTR 2b, bad_stack
PTR 3b, bad_stack
PTR 4b, bad_stack
.previous
li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
and t0, t1, t0
bnez t0, trace_a_syscall
jalr t2 # Do The Real Thing (TM)
li t0, -EMAXERRNO - 1 # error?
sltu t0, t0, v0
sd t0, PT_R7(sp) # set error flag
beqz t0, 1f
dnegu v0 # error
sd v0, PT_R0(sp) # flag for syscall restarting
1: sd v0, PT_R2(sp) # result
o32_syscall_exit:
local_irq_disable # make need_resched and
# signals dont change between
# sampling and return
LONG_L a2, TI_FLAGS($28)
li t0, _TIF_ALLWORK_MASK
and t0, a2, t0
bnez t0, o32_syscall_exit_work
j restore_partial
o32_syscall_exit_work:
j syscall_exit_work_partial
/* ------------------------------------------------------------------------ */
trace_a_syscall:
SAVE_STATIC
sd a4, PT_R8(sp) # Save argument registers
sd a5, PT_R9(sp)
sd a6, PT_R10(sp)
sd a7, PT_R11(sp) # For indirect syscalls
move s0, t2 # Save syscall pointer
move a0, sp
li a1, 0
jal do_syscall_trace
move t0, s0
RESTORE_STATIC
ld a0, PT_R4(sp) # Restore argument registers
ld a1, PT_R5(sp)
ld a2, PT_R6(sp)
ld a3, PT_R7(sp)
ld a4, PT_R8(sp)
ld a5, PT_R9(sp)
ld a6, PT_R10(sp)
ld a7, PT_R11(sp) # For indirect syscalls
jalr t0
li t0, -EMAXERRNO - 1 # error?
sltu t0, t0, v0
sd t0, PT_R7(sp) # set error flag
beqz t0, 1f
dnegu v0 # error
sd v0, PT_R0(sp) # set flag for syscall restarting
1: sd v0, PT_R2(sp) # result
j syscall_exit
/* ------------------------------------------------------------------------ */
/*
* The stackpointer for a call with more than 4 arguments is bad.
*/
bad_stack:
dnegu v0 # error
sd v0, PT_R0(sp)
sd v0, PT_R2(sp)
li t0, 1 # set error flag
sd t0, PT_R7(sp)
j o32_syscall_exit
not_o32_scall:
/*
* This is not an o32 compatibility syscall, pass it on
* to the 64-bit syscall handlers.
*/
#ifdef CONFIG_MIPS32_N32
j handle_sysn32
#else
j handle_sys64
#endif
END(handle_sys)
LEAF(sys32_syscall)
sltu v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1
beqz v0, einval
dsll v0, a0, 3
ld t2, (sys_call_table - (__NR_O32_Linux * 8))(v0)
li v1, 4000 # indirect syscall number
beq a0, v1, einval # do not recurse
move a0, a1 # shift argument registers
move a1, a2
move a2, a3
move a3, a4
move a4, a5
move a5, a6
move a6, a7
sd a0, PT_R4(sp) # ... and push back a0 - a3, some
sd a1, PT_R5(sp) # syscalls expect them there
sd a2, PT_R6(sp)
sd a3, PT_R7(sp)
sd a3, PT_R26(sp) # update a3 for syscall restarting
jr t2
/* Unreached */
einval: li v0, -EINVAL
jr ra
END(sys32_syscall)
.align 3
.type sys_call_table,@object
sys_call_table:
PTR sys32_syscall /* 4000 */
PTR sys_exit
PTR sys_fork
PTR sys_read
PTR sys_write
PTR compat_sys_open /* 4005 */
PTR sys_close
PTR sys_waitpid
PTR sys_creat
PTR sys_link
PTR sys_unlink /* 4010 */
PTR sys32_execve
PTR sys_chdir
PTR compat_sys_time
PTR sys_mknod
PTR sys_chmod /* 4015 */
PTR sys_lchown
PTR sys_ni_syscall
PTR sys_ni_syscall /* was sys_stat */
PTR sys_lseek
PTR sys_getpid /* 4020 */
PTR compat_sys_mount
PTR sys_oldumount
PTR sys_setuid
PTR sys_getuid
PTR compat_sys_stime /* 4025 */
PTR sys32_ptrace
PTR sys_alarm
PTR sys_ni_syscall /* was sys_fstat */
PTR sys_pause
PTR compat_sys_utime /* 4030 */
PTR sys_ni_syscall
PTR sys_ni_syscall
PTR sys_access
PTR sys_nice
PTR sys_ni_syscall /* 4035 */
PTR sys_sync
PTR sys_kill
PTR sys_rename
PTR sys_mkdir
PTR sys_rmdir /* 4040 */
PTR sys_dup
PTR sysm_pipe
PTR compat_sys_times
PTR sys_ni_syscall
PTR sys_brk /* 4045 */
PTR sys_setgid
PTR sys_getgid
PTR sys_ni_syscall /* was signal 2 */
PTR sys_geteuid
PTR sys_getegid /* 4050 */
PTR sys_acct
PTR sys_umount
PTR sys_ni_syscall
PTR compat_sys_ioctl
PTR compat_sys_fcntl /* 4055 */
PTR sys_ni_syscall
PTR sys_setpgid
PTR sys_ni_syscall
PTR sys_olduname
PTR sys_umask /* 4060 */
PTR sys_chroot
PTR sys32_ustat
PTR sys_dup2
PTR sys_getppid
PTR sys_getpgrp /* 4065 */
PTR sys_setsid
PTR sys32_sigaction
PTR sys_sgetmask
PTR sys_ssetmask
PTR sys_setreuid /* 4070 */
PTR sys_setregid
PTR sys32_sigsuspend
PTR compat_sys_sigpending
PTR sys_sethostname
PTR compat_sys_setrlimit /* 4075 */
PTR compat_sys_getrlimit
PTR compat_sys_getrusage
PTR sys32_gettimeofday
PTR sys32_settimeofday
PTR sys_getgroups /* 4080 */
PTR sys_setgroups
PTR sys_ni_syscall /* old_select */
PTR sys_symlink
PTR sys_ni_syscall /* was sys_lstat */
PTR sys_readlink /* 4085 */
PTR sys_uselib
PTR sys_swapon
PTR sys_reboot
PTR compat_sys_old_readdir
PTR old_mmap /* 4090 */
PTR sys_munmap
PTR sys_truncate
PTR sys_ftruncate
PTR sys_fchmod
PTR sys_fchown /* 4095 */
PTR sys_getpriority
PTR sys_setpriority
PTR sys_ni_syscall
PTR compat_sys_statfs
PTR compat_sys_fstatfs /* 4100 */
PTR sys_ni_syscall /* sys_ioperm */
PTR compat_sys_socketcall
PTR sys_syslog
PTR compat_sys_setitimer
PTR compat_sys_getitimer /* 4105 */
PTR compat_sys_newstat
PTR compat_sys_newlstat
PTR compat_sys_newfstat
PTR sys_uname
PTR sys_ni_syscall /* sys_ioperm *//* 4110 */
PTR sys_vhangup
PTR sys_ni_syscall /* was sys_idle */
PTR sys_ni_syscall /* sys_vm86 */
PTR compat_sys_wait4
PTR sys_swapoff /* 4115 */
PTR compat_sys_sysinfo
PTR sys32_ipc
PTR sys_fsync
PTR sys32_sigreturn
PTR sys32_clone /* 4120 */
PTR sys_setdomainname
PTR sys32_newuname
PTR sys_ni_syscall /* sys_modify_ldt */
PTR compat_sys_adjtimex
PTR sys_mprotect /* 4125 */
PTR compat_sys_sigprocmask
PTR sys_ni_syscall /* was creat_module */
PTR sys_init_module
PTR sys_delete_module
PTR sys_ni_syscall /* 4130, get_kernel_syms */
PTR sys_quotactl
PTR sys_getpgid
PTR sys_fchdir
PTR sys_bdflush
PTR sys_sysfs /* 4135 */
PTR sys32_personality
PTR sys_ni_syscall /* for afs_syscall */
PTR sys_setfsuid
PTR sys_setfsgid
PTR sys32_llseek /* 4140 */
PTR compat_sys_getdents
PTR compat_sys_select
PTR sys_flock
PTR sys_msync
PTR compat_sys_readv /* 4145 */
PTR compat_sys_writev
PTR sys_cacheflush
PTR sys_cachectl
PTR sys_sysmips
PTR sys_ni_syscall /* 4150 */
PTR sys_getsid
PTR sys_fdatasync
PTR sys32_sysctl
PTR sys_mlock
PTR sys_munlock /* 4155 */
PTR sys_mlockall
PTR sys_munlockall
PTR sys_sched_setparam
PTR sys_sched_getparam
PTR sys_sched_setscheduler /* 4160 */
PTR sys_sched_getscheduler
PTR sys_sched_yield
PTR sys_sched_get_priority_max
PTR sys_sched_get_priority_min
PTR sys32_sched_rr_get_interval /* 4165 */
PTR compat_sys_nanosleep
PTR sys_mremap
PTR sys_accept
PTR sys_bind
PTR sys_connect /* 4170 */
PTR sys_getpeername
PTR sys_getsockname
PTR sys_getsockopt
PTR sys_listen
PTR sys_recv /* 4175 */
PTR sys_recvfrom
PTR compat_sys_recvmsg
PTR sys_send
PTR compat_sys_sendmsg
PTR sys_sendto /* 4180 */
PTR compat_sys_setsockopt
PTR sys_shutdown
PTR sys_socket
PTR sys_socketpair
PTR sys_setresuid /* 4185 */
PTR sys_getresuid
PTR sys_ni_syscall /* was query_module */
PTR sys_poll
PTR compat_sys_nfsservctl
PTR sys_setresgid /* 4190 */
PTR sys_getresgid
PTR sys_prctl
PTR sys32_rt_sigreturn
PTR sys32_rt_sigaction
PTR sys32_rt_sigprocmask /* 4195 */
PTR sys32_rt_sigpending
PTR compat_sys_rt_sigtimedwait
PTR sys32_rt_sigqueueinfo
PTR sys32_rt_sigsuspend
PTR sys32_pread /* 4200 */
PTR sys32_pwrite
PTR sys_chown
PTR sys_getcwd
PTR sys_capget
PTR sys_capset /* 4205 */
PTR sys32_sigaltstack
PTR sys32_sendfile
PTR sys_ni_syscall
PTR sys_ni_syscall
PTR sys32_mmap2 /* 4210 */
PTR sys32_truncate64
PTR sys32_ftruncate64
PTR sys_newstat
PTR sys_newlstat
PTR sys_newfstat /* 4215 */
PTR sys_pivot_root
PTR sys_mincore
PTR sys_madvise
PTR sys_getdents64
PTR compat_sys_fcntl64 /* 4220 */
PTR sys_ni_syscall
PTR sys_gettid
PTR sys32_readahead
PTR sys_setxattr
PTR sys_lsetxattr /* 4225 */
PTR sys_fsetxattr
PTR sys_getxattr
PTR sys_lgetxattr
PTR sys_fgetxattr
PTR sys_listxattr /* 4230 */
PTR sys_llistxattr
PTR sys_flistxattr
PTR sys_removexattr
PTR sys_lremovexattr
PTR sys_fremovexattr /* 4235 */
PTR sys_tkill
PTR sys_sendfile64
PTR compat_sys_futex
PTR compat_sys_sched_setaffinity
PTR compat_sys_sched_getaffinity /* 4240 */
PTR sys_io_setup
PTR sys_io_destroy
PTR sys_io_getevents
PTR sys_io_submit
PTR sys_io_cancel /* 4245 */
PTR sys_exit_group
PTR sys_lookup_dcookie
PTR sys_epoll_create
PTR sys_epoll_ctl
PTR sys_epoll_wait /* 4250 */
PTR sys_remap_file_pages
PTR sys_set_tid_address
PTR sys_restart_syscall
PTR sys32_fadvise64_64
PTR compat_sys_statfs64 /* 4255 */
PTR compat_sys_fstatfs64
PTR compat_sys_timer_create
PTR compat_sys_timer_settime
PTR compat_sys_timer_gettime
PTR sys_timer_getoverrun /* 4260 */
PTR sys_timer_delete
PTR compat_sys_clock_settime
PTR compat_sys_clock_gettime
PTR compat_sys_clock_getres
PTR compat_sys_clock_nanosleep /* 4265 */
PTR sys_tgkill
PTR compat_sys_utimes
PTR sys_ni_syscall /* sys_mbind */
PTR sys_ni_syscall /* sys_get_mempolicy */
PTR sys_ni_syscall /* 4270 sys_set_mempolicy */
PTR compat_sys_mq_open
PTR sys_mq_unlink
PTR compat_sys_mq_timedsend
PTR compat_sys_mq_timedreceive
PTR compat_sys_mq_notify /* 4275 */
PTR compat_sys_mq_getsetattr
PTR sys_ni_syscall /* sys_vserver */
PTR sys32_waitid
PTR sys_ni_syscall /* available, was setaltroot */
PTR sys_add_key /* 4280 */
PTR sys_request_key
PTR sys_keyctl
PTR sys_set_thread_area
PTR sys_inotify_init
PTR sys_inotify_add_watch /* 4285 */
PTR sys_inotify_rm_watch
PTR sys_migrate_pages
PTR compat_sys_openat
PTR sys_mkdirat
PTR sys_mknodat /* 4290 */
PTR sys_fchownat
PTR compat_sys_futimesat
PTR sys_newfstatat
PTR sys_unlinkat
PTR sys_renameat /* 4295 */
PTR sys_linkat
PTR sys_symlinkat
PTR sys_readlinkat
PTR sys_fchmodat
PTR sys_faccessat /* 4300 */
PTR compat_sys_pselect6
PTR sys_ppoll
PTR sys_unshare
PTR sys_splice
PTR sys32_sync_file_range /* 4305 */
PTR sys_tee
PTR sys_vmsplice
PTR compat_sys_move_pages
PTR compat_sys_set_robust_list
PTR compat_sys_get_robust_list /* 4310 */
PTR compat_sys_kexec_load
PTR sys_getcpu
PTR compat_sys_epoll_pwait
PTR sys_ioprio_set
PTR sys_ioprio_get /* 4315 */
PTR compat_sys_utimensat
PTR compat_sys_signalfd
PTR sys_ni_syscall
PTR sys_eventfd
PTR sys32_fallocate /* 4320 */
PTR sys_timerfd_create
PTR sys_timerfd_gettime
PTR sys_timerfd_settime
.size sys_call_table,.-sys_call_table
|
