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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
7 * Copyright (C) 2001 MIPS Technologies, Inc.
8 * Copyright (C) 2004 Thiemo Seufer
9 */
10#include <linux/errno.h>
11#include <asm/asm.h>
12#include <asm/asmmacro.h>
13#include <asm/irqflags.h>
14#include <asm/mipsregs.h>
15#include <asm/regdef.h>
16#include <asm/stackframe.h>
17#include <asm/isadep.h>
18#include <asm/sysmips.h>
19#include <asm/thread_info.h>
20#include <asm/unistd.h>
21#include <asm/war.h>
22#include <asm/asm-offsets.h>
23
24/* Highest syscall used of any syscall flavour */
25#define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
26
27 .align 5
28NESTED(handle_sys, PT_SIZE, sp)
29 .set noat
30 SAVE_SOME
31 TRACE_IRQS_ON_RELOAD
32 STI
33 .set at
34
35 lw t1, PT_EPC(sp) # skip syscall on return
36
37 subu v0, v0, __NR_O32_Linux # check syscall number
38 sltiu t0, v0, __NR_O32_Linux_syscalls + 1
39 addiu t1, 4 # skip to next instruction
40 sw t1, PT_EPC(sp)
41 beqz t0, illegal_syscall
42
43 sll t0, v0, 3
44 la t1, sys_call_table
45 addu t1, t0
46 lw t2, (t1) # syscall routine
47 lw t3, 4(t1) # >= 0 if we need stack arguments
48 beqz t2, illegal_syscall
49
50 sw a3, PT_R26(sp) # save a3 for syscall restarting
51 bgez t3, stackargs
52
53stack_done:
54 lw t0, TI_FLAGS($28) # syscall tracing enabled?
55 li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
56 and t0, t1
57 bnez t0, syscall_trace_entry # -> yes
58
59 jalr t2 # Do The Real Thing (TM)
60
61 li t0, -EMAXERRNO - 1 # error?
62 sltu t0, t0, v0
63 sw t0, PT_R7(sp) # set error flag
64 beqz t0, 1f
65
66 lw t1, PT_R2(sp) # syscall number
67 negu v0 # error
68 sw t1, PT_R0(sp) # save it for syscall restarting
691: sw v0, PT_R2(sp) # result
70
71o32_syscall_exit:
72 local_irq_disable # make sure need_resched and
73 # signals dont change between
74 # sampling and return
75 lw a2, TI_FLAGS($28) # current->work
76 li t0, _TIF_ALLWORK_MASK
77 and t0, a2
78 bnez t0, o32_syscall_exit_work
79
80 j restore_partial
81
82o32_syscall_exit_work:
83 j syscall_exit_work_partial
84
85/* ------------------------------------------------------------------------ */
86
87syscall_trace_entry:
88 SAVE_STATIC
89 move s0, t2
90 move a0, sp
91 jal syscall_trace_enter
92
93 move t0, s0
94 RESTORE_STATIC
95 lw a0, PT_R4(sp) # Restore argument registers
96 lw a1, PT_R5(sp)
97 lw a2, PT_R6(sp)
98 lw a3, PT_R7(sp)
99 jalr t0
100
101 li t0, -EMAXERRNO - 1 # error?
102 sltu t0, t0, v0
103 sw t0, PT_R7(sp) # set error flag
104 beqz t0, 1f
105
106 lw t1, PT_R2(sp) # syscall number
107 negu v0 # error
108 sw t1, PT_R0(sp) # save it for syscall restarting
1091: sw v0, PT_R2(sp) # result
110
111 j syscall_exit
112
113/* ------------------------------------------------------------------------ */
114
115 /*
116 * More than four arguments. Try to deal with it by copying the
117 * stack arguments from the user stack to the kernel stack.
118 * This Sucks (TM).
119 */
120stackargs:
121 lw t0, PT_R29(sp) # get old user stack pointer
122
123 /*
124 * We intentionally keep the kernel stack a little below the top of
125 * userspace so we don't have to do a slower byte accurate check here.
126 */
127 lw t5, TI_ADDR_LIMIT($28)
128 addu t4, t0, 32
129 and t5, t4
130 bltz t5, bad_stack # -> sp is bad
131
132 /* Ok, copy the args from the luser stack to the kernel stack.
133 * t3 is the precomputed number of instruction bytes needed to
134 * load or store arguments 6-8.
135 */
136
137 la t1, 5f # load up to 3 arguments
138 subu t1, t3
1391: lw t5, 16(t0) # argument #5 from usp
140 .set push
141 .set noreorder
142 .set nomacro
143 jr t1
144 addiu t1, 6f - 5f
145
1462: lw t8, 28(t0) # argument #8 from usp
1473: lw t7, 24(t0) # argument #7 from usp
1484: lw t6, 20(t0) # argument #6 from usp
1495: jr t1
150 sw t5, 16(sp) # argument #5 to ksp
151
152 sw t8, 28(sp) # argument #8 to ksp
153 sw t7, 24(sp) # argument #7 to ksp
154 sw t6, 20(sp) # argument #6 to ksp
1556: j stack_done # go back
156 nop
157 .set pop
158
159 .section __ex_table,"a"
160 PTR 1b,bad_stack
161 PTR 2b,bad_stack
162 PTR 3b,bad_stack
163 PTR 4b,bad_stack
164 .previous
165
166 /*
167 * The stackpointer for a call with more than 4 arguments is bad.
168 * We probably should handle this case a bit more drastic.
169 */
170bad_stack:
171 li v0, EFAULT
172 sw v0, PT_R2(sp)
173 li t0, 1 # set error flag
174 sw t0, PT_R7(sp)
175 j o32_syscall_exit
176
177 /*
178 * The system call does not exist in this kernel
179 */
180illegal_syscall:
181 li v0, ENOSYS # error
182 sw v0, PT_R2(sp)
183 li t0, 1 # set error flag
184 sw t0, PT_R7(sp)
185 j o32_syscall_exit
186 END(handle_sys)
187
188 LEAF(sys_syscall)
189 subu t0, a0, __NR_O32_Linux # check syscall number
190 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
191 beqz t0, einval # do not recurse
192 sll t1, t0, 3
193 beqz v0, einval
194 lw t2, sys_call_table(t1) # syscall routine
195
196 /* Some syscalls like execve get their arguments from struct pt_regs
197 and claim zero arguments in the syscall table. Thus we have to
198 assume the worst case and shuffle around all potential arguments.
199 If you want performance, don't use indirect syscalls. */
200
201 move a0, a1 # shift argument registers
202 move a1, a2
203 move a2, a3
204 lw a3, 16(sp)
205 lw t4, 20(sp)
206 lw t5, 24(sp)
207 lw t6, 28(sp)
208 sw t4, 16(sp)
209 sw t5, 20(sp)
210 sw t6, 24(sp)
211 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
212 sw a1, PT_R5(sp) # syscalls expect them there
213 sw a2, PT_R6(sp)
214 sw a3, PT_R7(sp)
215 sw a3, PT_R26(sp) # update a3 for syscall restarting
216 jr t2
217 /* Unreached */
218
219einval: li v0, -ENOSYS
220 jr ra
221 END(sys_syscall)
222
223 .macro fifty ptr, nargs, from=1, to=50
224 sys \ptr \nargs
225 .if \to-\from
226 fifty \ptr,\nargs,"(\from+1)",\to
227 .endif
228 .endm
229
230 .macro mille ptr, nargs, from=1, to=20
231 fifty \ptr,\nargs
232 .if \to-\from
233 mille \ptr,\nargs,"(\from+1)",\to
234 .endif
235 .endm
236
237 .macro syscalltable
238 sys sys_syscall 8 /* 4000 */
239 sys sys_exit 1
240 sys sys_fork 0
241 sys sys_read 3
242 sys sys_write 3
243 sys sys_open 3 /* 4005 */
244 sys sys_close 1
245 sys sys_waitpid 3
246 sys sys_creat 2
247 sys sys_link 2
248 sys sys_unlink 1 /* 4010 */
249 sys sys_execve 0
250 sys sys_chdir 1
251 sys sys_time 1
252 sys sys_mknod 3
253 sys sys_chmod 2 /* 4015 */
254 sys sys_lchown 3
255 sys sys_ni_syscall 0
256 sys sys_ni_syscall 0 /* was sys_stat */
257 sys sys_lseek 3
258 sys sys_getpid 0 /* 4020 */
259 sys sys_mount 5
260 sys sys_oldumount 1
261 sys sys_setuid 1
262 sys sys_getuid 0
263 sys sys_stime 1 /* 4025 */
264 sys sys_ptrace 4
265 sys sys_alarm 1
266 sys sys_ni_syscall 0 /* was sys_fstat */
267 sys sys_pause 0
268 sys sys_utime 2 /* 4030 */
269 sys sys_ni_syscall 0
270 sys sys_ni_syscall 0
271 sys sys_access 2
272 sys sys_nice 1
273 sys sys_ni_syscall 0 /* 4035 */
274 sys sys_sync 0
275 sys sys_kill 2
276 sys sys_rename 2
277 sys sys_mkdir 2
278 sys sys_rmdir 1 /* 4040 */
279 sys sys_dup 1
280 sys sysm_pipe 0
281 sys sys_times 1
282 sys sys_ni_syscall 0
283 sys sys_brk 1 /* 4045 */
284 sys sys_setgid 1
285 sys sys_getgid 0
286 sys sys_ni_syscall 0 /* was signal(2) */
287 sys sys_geteuid 0
288 sys sys_getegid 0 /* 4050 */
289 sys sys_acct 1
290 sys sys_umount 2
291 sys sys_ni_syscall 0
292 sys sys_ioctl 3
293 sys sys_fcntl 3 /* 4055 */
294 sys sys_ni_syscall 2
295 sys sys_setpgid 2
296 sys sys_ni_syscall 0
297 sys sys_olduname 1
298 sys sys_umask 1 /* 4060 */
299 sys sys_chroot 1
300 sys sys_ustat 2
301 sys sys_dup2 2
302 sys sys_getppid 0
303 sys sys_getpgrp 0 /* 4065 */
304 sys sys_setsid 0
305 sys sys_sigaction 3
306 sys sys_sgetmask 0
307 sys sys_ssetmask 1
308 sys sys_setreuid 2 /* 4070 */
309 sys sys_setregid 2
310 sys sys_sigsuspend 0
311 sys sys_sigpending 1
312 sys sys_sethostname 2
313 sys sys_setrlimit 2 /* 4075 */
314 sys sys_getrlimit 2
315 sys sys_getrusage 2
316 sys sys_gettimeofday 2
317 sys sys_settimeofday 2
318 sys sys_getgroups 2 /* 4080 */
319 sys sys_setgroups 2
320 sys sys_ni_syscall 0 /* old_select */
321 sys sys_symlink 2
322 sys sys_ni_syscall 0 /* was sys_lstat */
323 sys sys_readlink 3 /* 4085 */
324 sys sys_uselib 1
325 sys sys_swapon 2
326 sys sys_reboot 3
327 sys sys_old_readdir 3
328 sys sys_mips_mmap 6 /* 4090 */
329 sys sys_munmap 2
330 sys sys_truncate 2
331 sys sys_ftruncate 2
332 sys sys_fchmod 2
333 sys sys_fchown 3 /* 4095 */
334 sys sys_getpriority 2
335 sys sys_setpriority 3
336 sys sys_ni_syscall 0
337 sys sys_statfs 2
338 sys sys_fstatfs 2 /* 4100 */
339 sys sys_ni_syscall 0 /* was ioperm(2) */
340 sys sys_socketcall 2
341 sys sys_syslog 3
342 sys sys_setitimer 3
343 sys sys_getitimer 2 /* 4105 */
344 sys sys_newstat 2
345 sys sys_newlstat 2
346 sys sys_newfstat 2
347 sys sys_uname 1
348 sys sys_ni_syscall 0 /* 4110 was iopl(2) */
349 sys sys_vhangup 0
350 sys sys_ni_syscall 0 /* was sys_idle() */
351 sys sys_ni_syscall 0 /* was sys_vm86 */
352 sys sys_wait4 4
353 sys sys_swapoff 1 /* 4115 */
354 sys sys_sysinfo 1
355 sys sys_ipc 6
356 sys sys_fsync 1
357 sys sys_sigreturn 0
358 sys sys_clone 0 /* 4120 */
359 sys sys_setdomainname 2
360 sys sys_newuname 1
361 sys sys_ni_syscall 0 /* sys_modify_ldt */
362 sys sys_adjtimex 1
363 sys sys_mprotect 3 /* 4125 */
364 sys sys_sigprocmask 3
365 sys sys_ni_syscall 0 /* was create_module */
366 sys sys_init_module 5
367 sys sys_delete_module 1
368 sys sys_ni_syscall 0 /* 4130 was get_kernel_syms */
369 sys sys_quotactl 4
370 sys sys_getpgid 1
371 sys sys_fchdir 1
372 sys sys_bdflush 2
373 sys sys_sysfs 3 /* 4135 */
374 sys sys_personality 1
375 sys sys_ni_syscall 0 /* for afs_syscall */
376 sys sys_setfsuid 1
377 sys sys_setfsgid 1
378 sys sys_llseek 5 /* 4140 */
379 sys sys_getdents 3
380 sys sys_select 5
381 sys sys_flock 2
382 sys sys_msync 3
383 sys sys_readv 3 /* 4145 */
384 sys sys_writev 3
385 sys sys_cacheflush 3
386 sys sys_cachectl 3
387 sys sys_sysmips 4
388 sys sys_ni_syscall 0 /* 4150 */
389 sys sys_getsid 1
390 sys sys_fdatasync 1
391 sys sys_sysctl 1
392 sys sys_mlock 2
393 sys sys_munlock 2 /* 4155 */
394 sys sys_mlockall 1
395 sys sys_munlockall 0
396 sys sys_sched_setparam 2
397 sys sys_sched_getparam 2
398 sys sys_sched_setscheduler 3 /* 4160 */
399 sys sys_sched_getscheduler 1
400 sys sys_sched_yield 0
401 sys sys_sched_get_priority_max 1
402 sys sys_sched_get_priority_min 1
403 sys sys_sched_rr_get_interval 2 /* 4165 */
404 sys sys_nanosleep, 2
405 sys sys_mremap, 5
406 sys sys_accept 3
407 sys sys_bind 3
408 sys sys_connect 3 /* 4170 */
409 sys sys_getpeername 3
410 sys sys_getsockname 3
411 sys sys_getsockopt 5
412 sys sys_listen 2
413 sys sys_recv 4 /* 4175 */
414 sys sys_recvfrom 6
415 sys sys_recvmsg 3
416 sys sys_send 4
417 sys sys_sendmsg 3
418 sys sys_sendto 6 /* 4180 */
419 sys sys_setsockopt 5
420 sys sys_shutdown 2
421 sys sys_socket 3
422 sys sys_socketpair 4
423 sys sys_setresuid 3 /* 4185 */
424 sys sys_getresuid 3
425 sys sys_ni_syscall 0 /* was sys_query_module */
426 sys sys_poll 3
427 sys sys_ni_syscall 0 /* was nfsservctl */
428 sys sys_setresgid 3 /* 4190 */
429 sys sys_getresgid 3
430 sys sys_prctl 5
431 sys sys_rt_sigreturn 0
432 sys sys_rt_sigaction 4
433 sys sys_rt_sigprocmask 4 /* 4195 */
434 sys sys_rt_sigpending 2
435 sys sys_rt_sigtimedwait 4
436 sys sys_rt_sigqueueinfo 3
437 sys sys_rt_sigsuspend 0
438 sys sys_pread64 6 /* 4200 */
439 sys sys_pwrite64 6
440 sys sys_chown 3
441 sys sys_getcwd 2
442 sys sys_capget 2
443 sys sys_capset 2 /* 4205 */
444 sys sys_sigaltstack 0
445 sys sys_sendfile 4
446 sys sys_ni_syscall 0
447 sys sys_ni_syscall 0
448 sys sys_mips_mmap2 6 /* 4210 */
449 sys sys_truncate64 4
450 sys sys_ftruncate64 4
451 sys sys_stat64 2
452 sys sys_lstat64 2
453 sys sys_fstat64 2 /* 4215 */
454 sys sys_pivot_root 2
455 sys sys_mincore 3
456 sys sys_madvise 3
457 sys sys_getdents64 3
458 sys sys_fcntl64 3 /* 4220 */
459 sys sys_ni_syscall 0
460 sys sys_gettid 0
461 sys sys_readahead 5
462 sys sys_setxattr 5
463 sys sys_lsetxattr 5 /* 4225 */
464 sys sys_fsetxattr 5
465 sys sys_getxattr 4
466 sys sys_lgetxattr 4
467 sys sys_fgetxattr 4
468 sys sys_listxattr 3 /* 4230 */
469 sys sys_llistxattr 3
470 sys sys_flistxattr 3
471 sys sys_removexattr 2
472 sys sys_lremovexattr 2
473 sys sys_fremovexattr 2 /* 4235 */
474 sys sys_tkill 2
475 sys sys_sendfile64 5
476 sys sys_futex 6
477#ifdef CONFIG_MIPS_MT_FPAFF
478 /*
479 * For FPU affinity scheduling on MIPS MT processors, we need to
480 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
481 * in kernel/sched.c. Considered only temporary we only support these
482 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
483 */
484 sys mipsmt_sys_sched_setaffinity 3
485 sys mipsmt_sys_sched_getaffinity 3
486#else
487 sys sys_sched_setaffinity 3
488 sys sys_sched_getaffinity 3 /* 4240 */
489#endif /* CONFIG_MIPS_MT_FPAFF */
490 sys sys_io_setup 2
491 sys sys_io_destroy 1
492 sys sys_io_getevents 5
493 sys sys_io_submit 3
494 sys sys_io_cancel 3 /* 4245 */
495 sys sys_exit_group 1
496 sys sys_lookup_dcookie 4
497 sys sys_epoll_create 1
498 sys sys_epoll_ctl 4
499 sys sys_epoll_wait 4 /* 4250 */
500 sys sys_remap_file_pages 5
501 sys sys_set_tid_address 1
502 sys sys_restart_syscall 0
503 sys sys_fadvise64_64 7
504 sys sys_statfs64 3 /* 4255 */
505 sys sys_fstatfs64 2
506 sys sys_timer_create 3
507 sys sys_timer_settime 4
508 sys sys_timer_gettime 2
509 sys sys_timer_getoverrun 1 /* 4260 */
510 sys sys_timer_delete 1
511 sys sys_clock_settime 2
512 sys sys_clock_gettime 2
513 sys sys_clock_getres 2
514 sys sys_clock_nanosleep 4 /* 4265 */
515 sys sys_tgkill 3
516 sys sys_utimes 2
517 sys sys_mbind 4
518 sys sys_ni_syscall 0 /* sys_get_mempolicy */
519 sys sys_ni_syscall 0 /* 4270 sys_set_mempolicy */
520 sys sys_mq_open 4
521 sys sys_mq_unlink 1
522 sys sys_mq_timedsend 5
523 sys sys_mq_timedreceive 5
524 sys sys_mq_notify 2 /* 4275 */
525 sys sys_mq_getsetattr 3
526 sys sys_ni_syscall 0 /* sys_vserver */
527 sys sys_waitid 5
528 sys sys_ni_syscall 0 /* available, was setaltroot */
529 sys sys_add_key 5 /* 4280 */
530 sys sys_request_key 4
531 sys sys_keyctl 5
532 sys sys_set_thread_area 1
533 sys sys_inotify_init 0
534 sys sys_inotify_add_watch 3 /* 4285 */
535 sys sys_inotify_rm_watch 2
536 sys sys_migrate_pages 4
537 sys sys_openat 4
538 sys sys_mkdirat 3
539 sys sys_mknodat 4 /* 4290 */
540 sys sys_fchownat 5
541 sys sys_futimesat 3
542 sys sys_fstatat64 4
543 sys sys_unlinkat 3
544 sys sys_renameat 4 /* 4295 */
545 sys sys_linkat 5
546 sys sys_symlinkat 3
547 sys sys_readlinkat 4
548 sys sys_fchmodat 3
549 sys sys_faccessat 3 /* 4300 */
550 sys sys_pselect6 6
551 sys sys_ppoll 5
552 sys sys_unshare 1
553 sys sys_splice 6
554 sys sys_sync_file_range 7 /* 4305 */
555 sys sys_tee 4
556 sys sys_vmsplice 4
557 sys sys_move_pages 6
558 sys sys_set_robust_list 2
559 sys sys_get_robust_list 3 /* 4310 */
560 sys sys_kexec_load 4
561 sys sys_getcpu 3
562 sys sys_epoll_pwait 6
563 sys sys_ioprio_set 3
564 sys sys_ioprio_get 2 /* 4315 */
565 sys sys_utimensat 4
566 sys sys_signalfd 3
567 sys sys_ni_syscall 0 /* was timerfd */
568 sys sys_eventfd 1
569 sys sys_fallocate 6 /* 4320 */
570 sys sys_timerfd_create 2
571 sys sys_timerfd_gettime 2
572 sys sys_timerfd_settime 4
573 sys sys_signalfd4 4
574 sys sys_eventfd2 2 /* 4325 */
575 sys sys_epoll_create1 1
576 sys sys_dup3 3
577 sys sys_pipe2 2
578 sys sys_inotify_init1 1
579 sys sys_preadv 6 /* 4330 */
580 sys sys_pwritev 6
581 sys sys_rt_tgsigqueueinfo 4
582 sys sys_perf_event_open 5
583 sys sys_accept4 4
584 sys sys_recvmmsg 5 /* 4335 */
585 sys sys_fanotify_init 2
586 sys sys_fanotify_mark 6
587 sys sys_prlimit64 4
588 sys sys_name_to_handle_at 5
589 sys sys_open_by_handle_at 3 /* 4340 */
590 sys sys_clock_adjtime 2
591 sys sys_syncfs 1
592 sys sys_sendmmsg 4
593 sys sys_setns 2
594 sys sys_process_vm_readv 6 /* 4345 */
595 sys sys_process_vm_writev 6
596 .endm
597
598 /* We pre-compute the number of _instruction_ bytes needed to
599 load or store the arguments 6-8. Negative values are ignored. */
600
601 .macro sys function, nargs
602 PTR \function
603 LONG (\nargs << 2) - (5 << 2)
604 .endm
605
606 .align 3
607 .type sys_call_table,@object
608EXPORT(sys_call_table)
609 syscalltable
610 .size sys_call_table, . - sys_call_table
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
7 * Copyright (C) 2001 MIPS Technologies, Inc.
8 * Copyright (C) 2004 Thiemo Seufer
9 * Copyright (C) 2014 Imagination Technologies Ltd.
10 */
11#include <linux/errno.h>
12#include <asm/asm.h>
13#include <asm/asmmacro.h>
14#include <asm/irqflags.h>
15#include <asm/mipsregs.h>
16#include <asm/regdef.h>
17#include <asm/stackframe.h>
18#include <asm/isadep.h>
19#include <asm/sysmips.h>
20#include <asm/thread_info.h>
21#include <asm/unistd.h>
22#include <asm/war.h>
23#include <asm/asm-offsets.h>
24
25/* Highest syscall used of any syscall flavour */
26#define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
27
28 .align 5
29NESTED(handle_sys, PT_SIZE, sp)
30 .set noat
31 SAVE_SOME
32 TRACE_IRQS_ON_RELOAD
33 STI
34 .set at
35
36 lw t1, PT_EPC(sp) # skip syscall on return
37
38 subu v0, v0, __NR_O32_Linux # check syscall number
39 sltiu t0, v0, __NR_O32_Linux_syscalls + 1
40 addiu t1, 4 # skip to next instruction
41 sw t1, PT_EPC(sp)
42 beqz t0, illegal_syscall
43
44 sll t0, v0, 2
45 la t1, sys_call_table
46 addu t1, t0
47 lw t2, (t1) # syscall routine
48 beqz t2, illegal_syscall
49
50 sw a3, PT_R26(sp) # save a3 for syscall restarting
51
52 /*
53 * More than four arguments. Try to deal with it by copying the
54 * stack arguments from the user stack to the kernel stack.
55 * This Sucks (TM).
56 */
57 lw t0, PT_R29(sp) # get old user stack pointer
58
59 /*
60 * We intentionally keep the kernel stack a little below the top of
61 * userspace so we don't have to do a slower byte accurate check here.
62 */
63 lw t5, TI_ADDR_LIMIT($28)
64 addu t4, t0, 32
65 and t5, t4
66 bltz t5, bad_stack # -> sp is bad
67
68 /*
69 * Ok, copy the args from the luser stack to the kernel stack.
70 * t3 is the precomputed number of instruction bytes needed to
71 * load or store arguments 6-8.
72 */
73
74 .set push
75 .set noreorder
76 .set nomacro
77
781: user_lw(t5, 16(t0)) # argument #5 from usp
794: user_lw(t6, 20(t0)) # argument #6 from usp
803: user_lw(t7, 24(t0)) # argument #7 from usp
812: user_lw(t8, 28(t0)) # argument #8 from usp
82
83 sw t5, 16(sp) # argument #5 to ksp
84 sw t6, 20(sp) # argument #6 to ksp
85 sw t7, 24(sp) # argument #7 to ksp
86 sw t8, 28(sp) # argument #8 to ksp
87 .set pop
88
89 .section __ex_table,"a"
90 PTR 1b,bad_stack
91 PTR 2b,bad_stack
92 PTR 3b,bad_stack
93 PTR 4b,bad_stack
94 .previous
95
96 lw t0, TI_FLAGS($28) # syscall tracing enabled?
97 li t1, _TIF_WORK_SYSCALL_ENTRY
98 and t0, t1
99 bnez t0, syscall_trace_entry # -> yes
100
101 jalr t2 # Do The Real Thing (TM)
102
103 li t0, -EMAXERRNO - 1 # error?
104 sltu t0, t0, v0
105 sw t0, PT_R7(sp) # set error flag
106 beqz t0, 1f
107
108 lw t1, PT_R2(sp) # syscall number
109 negu v0 # error
110 sw t1, PT_R0(sp) # save it for syscall restarting
1111: sw v0, PT_R2(sp) # result
112
113o32_syscall_exit:
114 j syscall_exit_partial
115
116/* ------------------------------------------------------------------------ */
117
118syscall_trace_entry:
119 SAVE_STATIC
120 move s0, t2
121 move a0, sp
122
123 /*
124 * syscall number is in v0 unless we called syscall(__NR_###)
125 * where the real syscall number is in a0
126 */
127 addiu a1, v0, __NR_O32_Linux
128 bnez v0, 1f /* __NR_syscall at offset 0 */
129 lw a1, PT_R4(sp)
130
1311: jal syscall_trace_enter
132
133 bltz v0, 2f # seccomp failed? Skip syscall
134
135 move t0, s0
136 RESTORE_STATIC
137 lw a0, PT_R4(sp) # Restore argument registers
138 lw a1, PT_R5(sp)
139 lw a2, PT_R6(sp)
140 lw a3, PT_R7(sp)
141 jalr t0
142
143 li t0, -EMAXERRNO - 1 # error?
144 sltu t0, t0, v0
145 sw t0, PT_R7(sp) # set error flag
146 beqz t0, 1f
147
148 lw t1, PT_R2(sp) # syscall number
149 negu v0 # error
150 sw t1, PT_R0(sp) # save it for syscall restarting
1511: sw v0, PT_R2(sp) # result
152
1532: j syscall_exit
154
155/* ------------------------------------------------------------------------ */
156
157 /*
158 * The stackpointer for a call with more than 4 arguments is bad.
159 * We probably should handle this case a bit more drastic.
160 */
161bad_stack:
162 li v0, EFAULT
163 sw v0, PT_R2(sp)
164 li t0, 1 # set error flag
165 sw t0, PT_R7(sp)
166 j o32_syscall_exit
167
168 /*
169 * The system call does not exist in this kernel
170 */
171illegal_syscall:
172 li v0, ENOSYS # error
173 sw v0, PT_R2(sp)
174 li t0, 1 # set error flag
175 sw t0, PT_R7(sp)
176 j o32_syscall_exit
177 END(handle_sys)
178
179 LEAF(sys_syscall)
180 subu t0, a0, __NR_O32_Linux # check syscall number
181 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
182 beqz t0, einval # do not recurse
183 sll t1, t0, 2
184 beqz v0, einval
185 lw t2, sys_call_table(t1) # syscall routine
186
187 /* Some syscalls like execve get their arguments from struct pt_regs
188 and claim zero arguments in the syscall table. Thus we have to
189 assume the worst case and shuffle around all potential arguments.
190 If you want performance, don't use indirect syscalls. */
191
192 move a0, a1 # shift argument registers
193 move a1, a2
194 move a2, a3
195 lw a3, 16(sp)
196 lw t4, 20(sp)
197 lw t5, 24(sp)
198 lw t6, 28(sp)
199 sw t4, 16(sp)
200 sw t5, 20(sp)
201 sw t6, 24(sp)
202 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
203 sw a1, PT_R5(sp) # syscalls expect them there
204 sw a2, PT_R6(sp)
205 sw a3, PT_R7(sp)
206 sw a3, PT_R26(sp) # update a3 for syscall restarting
207 jr t2
208 /* Unreached */
209
210einval: li v0, -ENOSYS
211 jr ra
212 END(sys_syscall)
213
214 .align 2
215 .type sys_call_table, @object
216EXPORT(sys_call_table)
217 PTR sys_syscall /* 4000 */
218 PTR sys_exit
219 PTR __sys_fork
220 PTR sys_read
221 PTR sys_write
222 PTR sys_open /* 4005 */
223 PTR sys_close
224 PTR sys_waitpid
225 PTR sys_creat
226 PTR sys_link
227 PTR sys_unlink /* 4010 */
228 PTR sys_execve
229 PTR sys_chdir
230 PTR sys_time
231 PTR sys_mknod
232 PTR sys_chmod /* 4015 */
233 PTR sys_lchown
234 PTR sys_ni_syscall
235 PTR sys_ni_syscall /* was sys_stat */
236 PTR sys_lseek
237 PTR sys_getpid /* 4020 */
238 PTR sys_mount
239 PTR sys_oldumount
240 PTR sys_setuid
241 PTR sys_getuid
242 PTR sys_stime /* 4025 */
243 PTR sys_ptrace
244 PTR sys_alarm
245 PTR sys_ni_syscall /* was sys_fstat */
246 PTR sys_pause
247 PTR sys_utime /* 4030 */
248 PTR sys_ni_syscall
249 PTR sys_ni_syscall
250 PTR sys_access
251 PTR sys_nice
252 PTR sys_ni_syscall /* 4035 */
253 PTR sys_sync
254 PTR sys_kill
255 PTR sys_rename
256 PTR sys_mkdir
257 PTR sys_rmdir /* 4040 */
258 PTR sys_dup
259 PTR sysm_pipe
260 PTR sys_times
261 PTR sys_ni_syscall
262 PTR sys_brk /* 4045 */
263 PTR sys_setgid
264 PTR sys_getgid
265 PTR sys_ni_syscall /* was signal(2) */
266 PTR sys_geteuid
267 PTR sys_getegid /* 4050 */
268 PTR sys_acct
269 PTR sys_umount
270 PTR sys_ni_syscall
271 PTR sys_ioctl
272 PTR sys_fcntl /* 4055 */
273 PTR sys_ni_syscall
274 PTR sys_setpgid
275 PTR sys_ni_syscall
276 PTR sys_olduname
277 PTR sys_umask /* 4060 */
278 PTR sys_chroot
279 PTR sys_ustat
280 PTR sys_dup2
281 PTR sys_getppid
282 PTR sys_getpgrp /* 4065 */
283 PTR sys_setsid
284 PTR sys_sigaction
285 PTR sys_sgetmask
286 PTR sys_ssetmask
287 PTR sys_setreuid /* 4070 */
288 PTR sys_setregid
289 PTR sys_sigsuspend
290 PTR sys_sigpending
291 PTR sys_sethostname
292 PTR sys_setrlimit /* 4075 */
293 PTR sys_getrlimit
294 PTR sys_getrusage
295 PTR sys_gettimeofday
296 PTR sys_settimeofday
297 PTR sys_getgroups /* 4080 */
298 PTR sys_setgroups
299 PTR sys_ni_syscall /* old_select */
300 PTR sys_symlink
301 PTR sys_ni_syscall /* was sys_lstat */
302 PTR sys_readlink /* 4085 */
303 PTR sys_uselib
304 PTR sys_swapon
305 PTR sys_reboot
306 PTR sys_old_readdir
307 PTR sys_mips_mmap /* 4090 */
308 PTR sys_munmap
309 PTR sys_truncate
310 PTR sys_ftruncate
311 PTR sys_fchmod
312 PTR sys_fchown /* 4095 */
313 PTR sys_getpriority
314 PTR sys_setpriority
315 PTR sys_ni_syscall
316 PTR sys_statfs
317 PTR sys_fstatfs /* 4100 */
318 PTR sys_ni_syscall /* was ioperm(2) */
319 PTR sys_socketcall
320 PTR sys_syslog
321 PTR sys_setitimer
322 PTR sys_getitimer /* 4105 */
323 PTR sys_newstat
324 PTR sys_newlstat
325 PTR sys_newfstat
326 PTR sys_uname
327 PTR sys_ni_syscall /* 4110 was iopl(2) */
328 PTR sys_vhangup
329 PTR sys_ni_syscall /* was sys_idle() */
330 PTR sys_ni_syscall /* was sys_vm86 */
331 PTR sys_wait4
332 PTR sys_swapoff /* 4115 */
333 PTR sys_sysinfo
334 PTR sys_ipc
335 PTR sys_fsync
336 PTR sys_sigreturn
337 PTR __sys_clone /* 4120 */
338 PTR sys_setdomainname
339 PTR sys_newuname
340 PTR sys_ni_syscall /* sys_modify_ldt */
341 PTR sys_adjtimex
342 PTR sys_mprotect /* 4125 */
343 PTR sys_sigprocmask
344 PTR sys_ni_syscall /* was create_module */
345 PTR sys_init_module
346 PTR sys_delete_module
347 PTR sys_ni_syscall /* 4130 was get_kernel_syms */
348 PTR sys_quotactl
349 PTR sys_getpgid
350 PTR sys_fchdir
351 PTR sys_bdflush
352 PTR sys_sysfs /* 4135 */
353 PTR sys_personality
354 PTR sys_ni_syscall /* for afs_syscall */
355 PTR sys_setfsuid
356 PTR sys_setfsgid
357 PTR sys_llseek /* 4140 */
358 PTR sys_getdents
359 PTR sys_select
360 PTR sys_flock
361 PTR sys_msync
362 PTR sys_readv /* 4145 */
363 PTR sys_writev
364 PTR sys_cacheflush
365 PTR sys_cachectl
366 PTR sys_sysmips
367 PTR sys_ni_syscall /* 4150 */
368 PTR sys_getsid
369 PTR sys_fdatasync
370 PTR sys_sysctl
371 PTR sys_mlock
372 PTR sys_munlock /* 4155 */
373 PTR sys_mlockall
374 PTR sys_munlockall
375 PTR sys_sched_setparam
376 PTR sys_sched_getparam
377 PTR sys_sched_setscheduler /* 4160 */
378 PTR sys_sched_getscheduler
379 PTR sys_sched_yield
380 PTR sys_sched_get_priority_max
381 PTR sys_sched_get_priority_min
382 PTR sys_sched_rr_get_interval /* 4165 */
383 PTR sys_nanosleep
384 PTR sys_mremap
385 PTR sys_accept
386 PTR sys_bind
387 PTR sys_connect /* 4170 */
388 PTR sys_getpeername
389 PTR sys_getsockname
390 PTR sys_getsockopt
391 PTR sys_listen
392 PTR sys_recv /* 4175 */
393 PTR sys_recvfrom
394 PTR sys_recvmsg
395 PTR sys_send
396 PTR sys_sendmsg
397 PTR sys_sendto /* 4180 */
398 PTR sys_setsockopt
399 PTR sys_shutdown
400 PTR sys_socket
401 PTR sys_socketpair
402 PTR sys_setresuid /* 4185 */
403 PTR sys_getresuid
404 PTR sys_ni_syscall /* was sys_query_module */
405 PTR sys_poll
406 PTR sys_ni_syscall /* was nfsservctl */
407 PTR sys_setresgid /* 4190 */
408 PTR sys_getresgid
409 PTR sys_prctl
410 PTR sys_rt_sigreturn
411 PTR sys_rt_sigaction
412 PTR sys_rt_sigprocmask /* 4195 */
413 PTR sys_rt_sigpending
414 PTR sys_rt_sigtimedwait
415 PTR sys_rt_sigqueueinfo
416 PTR sys_rt_sigsuspend
417 PTR sys_pread64 /* 4200 */
418 PTR sys_pwrite64
419 PTR sys_chown
420 PTR sys_getcwd
421 PTR sys_capget
422 PTR sys_capset /* 4205 */
423 PTR sys_sigaltstack
424 PTR sys_sendfile
425 PTR sys_ni_syscall
426 PTR sys_ni_syscall
427 PTR sys_mips_mmap2 /* 4210 */
428 PTR sys_truncate64
429 PTR sys_ftruncate64
430 PTR sys_stat64
431 PTR sys_lstat64
432 PTR sys_fstat64 /* 4215 */
433 PTR sys_pivot_root
434 PTR sys_mincore
435 PTR sys_madvise
436 PTR sys_getdents64
437 PTR sys_fcntl64 /* 4220 */
438 PTR sys_ni_syscall
439 PTR sys_gettid
440 PTR sys_readahead
441 PTR sys_setxattr
442 PTR sys_lsetxattr /* 4225 */
443 PTR sys_fsetxattr
444 PTR sys_getxattr
445 PTR sys_lgetxattr
446 PTR sys_fgetxattr
447 PTR sys_listxattr /* 4230 */
448 PTR sys_llistxattr
449 PTR sys_flistxattr
450 PTR sys_removexattr
451 PTR sys_lremovexattr
452 PTR sys_fremovexattr /* 4235 */
453 PTR sys_tkill
454 PTR sys_sendfile64
455 PTR sys_futex
456#ifdef CONFIG_MIPS_MT_FPAFF
457 /*
458 * For FPU affinity scheduling on MIPS MT processors, we need to
459 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
460 * in kernel/sched/core.c. Considered only temporary we only support
461 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor
462 * atm.
463 */
464 PTR mipsmt_sys_sched_setaffinity
465 PTR mipsmt_sys_sched_getaffinity
466#else
467 PTR sys_sched_setaffinity
468 PTR sys_sched_getaffinity /* 4240 */
469#endif /* CONFIG_MIPS_MT_FPAFF */
470 PTR sys_io_setup
471 PTR sys_io_destroy
472 PTR sys_io_getevents
473 PTR sys_io_submit
474 PTR sys_io_cancel /* 4245 */
475 PTR sys_exit_group
476 PTR sys_lookup_dcookie
477 PTR sys_epoll_create
478 PTR sys_epoll_ctl
479 PTR sys_epoll_wait /* 4250 */
480 PTR sys_remap_file_pages
481 PTR sys_set_tid_address
482 PTR sys_restart_syscall
483 PTR sys_fadvise64_64
484 PTR sys_statfs64 /* 4255 */
485 PTR sys_fstatfs64
486 PTR sys_timer_create
487 PTR sys_timer_settime
488 PTR sys_timer_gettime
489 PTR sys_timer_getoverrun /* 4260 */
490 PTR sys_timer_delete
491 PTR sys_clock_settime
492 PTR sys_clock_gettime
493 PTR sys_clock_getres
494 PTR sys_clock_nanosleep /* 4265 */
495 PTR sys_tgkill
496 PTR sys_utimes
497 PTR sys_mbind
498 PTR sys_ni_syscall /* sys_get_mempolicy */
499 PTR sys_ni_syscall /* 4270 sys_set_mempolicy */
500 PTR sys_mq_open
501 PTR sys_mq_unlink
502 PTR sys_mq_timedsend
503 PTR sys_mq_timedreceive
504 PTR sys_mq_notify /* 4275 */
505 PTR sys_mq_getsetattr
506 PTR sys_ni_syscall /* sys_vserver */
507 PTR sys_waitid
508 PTR sys_ni_syscall /* available, was setaltroot */
509 PTR sys_add_key /* 4280 */
510 PTR sys_request_key
511 PTR sys_keyctl
512 PTR sys_set_thread_area
513 PTR sys_inotify_init
514 PTR sys_inotify_add_watch /* 4285 */
515 PTR sys_inotify_rm_watch
516 PTR sys_migrate_pages
517 PTR sys_openat
518 PTR sys_mkdirat
519 PTR sys_mknodat /* 4290 */
520 PTR sys_fchownat
521 PTR sys_futimesat
522 PTR sys_fstatat64
523 PTR sys_unlinkat
524 PTR sys_renameat /* 4295 */
525 PTR sys_linkat
526 PTR sys_symlinkat
527 PTR sys_readlinkat
528 PTR sys_fchmodat
529 PTR sys_faccessat /* 4300 */
530 PTR sys_pselect6
531 PTR sys_ppoll
532 PTR sys_unshare
533 PTR sys_splice
534 PTR sys_sync_file_range /* 4305 */
535 PTR sys_tee
536 PTR sys_vmsplice
537 PTR sys_move_pages
538 PTR sys_set_robust_list
539 PTR sys_get_robust_list /* 4310 */
540 PTR sys_kexec_load
541 PTR sys_getcpu
542 PTR sys_epoll_pwait
543 PTR sys_ioprio_set
544 PTR sys_ioprio_get /* 4315 */
545 PTR sys_utimensat
546 PTR sys_signalfd
547 PTR sys_ni_syscall /* was timerfd */
548 PTR sys_eventfd
549 PTR sys_fallocate /* 4320 */
550 PTR sys_timerfd_create
551 PTR sys_timerfd_gettime
552 PTR sys_timerfd_settime
553 PTR sys_signalfd4
554 PTR sys_eventfd2 /* 4325 */
555 PTR sys_epoll_create1
556 PTR sys_dup3
557 PTR sys_pipe2
558 PTR sys_inotify_init1
559 PTR sys_preadv /* 4330 */
560 PTR sys_pwritev
561 PTR sys_rt_tgsigqueueinfo
562 PTR sys_perf_event_open
563 PTR sys_accept4
564 PTR sys_recvmmsg /* 4335 */
565 PTR sys_fanotify_init
566 PTR sys_fanotify_mark
567 PTR sys_prlimit64
568 PTR sys_name_to_handle_at
569 PTR sys_open_by_handle_at /* 4340 */
570 PTR sys_clock_adjtime
571 PTR sys_syncfs
572 PTR sys_sendmmsg
573 PTR sys_setns
574 PTR sys_process_vm_readv /* 4345 */
575 PTR sys_process_vm_writev
576 PTR sys_kcmp
577 PTR sys_finit_module
578 PTR sys_sched_setattr
579 PTR sys_sched_getattr /* 4350 */
580 PTR sys_renameat2