| blob | 4cc13508d967c4076e0b720b120487281003ed72 |
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>
25 /* Highest syscall used of any syscall flavour */
26 #define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
28 .align 5
29 NESTED(handle_sys, PT_SIZE, sp)
30 .set noat
31 SAVE_SOME
32 TRACE_IRQS_ON_RELOAD
33 STI
34 .set at
36 lw t1, PT_EPC(sp) # skip syscall on return
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
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
50 sw a3, PT_R26(sp) # save a3 for syscall restarting
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
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
68 /*
69 * Ok, copy the args from the luser stack to the kernel stack.
70 */
72 .set push
73 .set noreorder
74 .set nomacro
76 load_a4: user_lw(t5, 16(t0)) # argument #5 from usp
77 load_a5: user_lw(t6, 20(t0)) # argument #6 from usp
78 load_a6: user_lw(t7, 24(t0)) # argument #7 from usp
79 load_a7: user_lw(t8, 28(t0)) # argument #8 from usp
80 loads_done:
82 sw t5, 16(sp) # argument #5 to ksp
83 sw t6, 20(sp) # argument #6 to ksp
84 sw t7, 24(sp) # argument #7 to ksp
85 sw t8, 28(sp) # argument #8 to ksp
86 .set pop
88 .section __ex_table,"a"
89 PTR load_a4, bad_stack_a4
90 PTR load_a5, bad_stack_a5
91 PTR load_a6, bad_stack_a6
92 PTR load_a7, bad_stack_a7
93 .previous
95 lw t0, TI_FLAGS($28) # syscall tracing enabled?
96 li t1, _TIF_WORK_SYSCALL_ENTRY
97 and t0, t1
98 bnez t0, syscall_trace_entry # -> yes
100 jalr t2 # Do The Real Thing (TM)
102 li t0, -EMAXERRNO - 1 # error?
103 sltu t0, t0, v0
104 sw t0, PT_R7(sp) # set error flag
105 beqz t0, 1f
107 lw t1, PT_R2(sp) # syscall number
108 negu v0 # error
109 sw t1, PT_R0(sp) # save it for syscall restarting
110 1: sw v0, PT_R2(sp) # result
112 o32_syscall_exit:
113 j syscall_exit_partial
115 /* ------------------------------------------------------------------------ */
117 syscall_trace_entry:
118 SAVE_STATIC
119 move s0, t2
120 move a0, sp
122 /*
123 * syscall number is in v0 unless we called syscall(__NR_###)
124 * where the real syscall number is in a0
125 */
126 addiu a1, v0, __NR_O32_Linux
127 bnez v0, 1f /* __NR_syscall at offset 0 */
128 lw a1, PT_R4(sp)
130 1: jal syscall_trace_enter
132 bltz v0, 2f # seccomp failed? Skip syscall
134 move t0, s0
135 RESTORE_STATIC
136 lw a0, PT_R4(sp) # Restore argument registers
137 lw a1, PT_R5(sp)
138 lw a2, PT_R6(sp)
139 lw a3, PT_R7(sp)
140 jalr t0
142 li t0, -EMAXERRNO - 1 # error?
143 sltu t0, t0, v0
144 sw t0, PT_R7(sp) # set error flag
145 beqz t0, 1f
147 lw t1, PT_R2(sp) # syscall number
148 negu v0 # error
149 sw t1, PT_R0(sp) # save it for syscall restarting
150 1: sw v0, PT_R2(sp) # result
152 2: j syscall_exit
154 /* ------------------------------------------------------------------------ */
156 /*
157 * Our open-coded access area sanity test for the stack pointer
158 * failed. We probably should handle this case a bit more drastic.
159 */
160 bad_stack:
161 li v0, EFAULT
162 sw v0, PT_R2(sp)
163 li t0, 1 # set error flag
164 sw t0, PT_R7(sp)
165 j o32_syscall_exit
167 bad_stack_a4:
168 li t5, 0
169 b load_a5
171 bad_stack_a5:
172 li t6, 0
173 b load_a6
175 bad_stack_a6:
176 li t7, 0
177 b load_a7
179 bad_stack_a7:
180 li t8, 0
181 b loads_done
183 /*
184 * The system call does not exist in this kernel
185 */
186 illegal_syscall:
187 li v0, ENOSYS # error
188 sw v0, PT_R2(sp)
189 li t0, 1 # set error flag
190 sw t0, PT_R7(sp)
191 j o32_syscall_exit
192 END(handle_sys)
194 LEAF(sys_syscall)
195 subu t0, a0, __NR_O32_Linux # check syscall number
196 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
197 beqz t0, einval # do not recurse
198 sll t1, t0, 2
199 beqz v0, einval
200 lw t2, sys_call_table(t1) # syscall routine
201 sw a0, PT_R2(sp) # call routine directly on restart
203 /* Some syscalls like execve get their arguments from struct pt_regs
204 and claim zero arguments in the syscall table. Thus we have to
205 assume the worst case and shuffle around all potential arguments.
206 If you want performance, don't use indirect syscalls. */
208 move a0, a1 # shift argument registers
209 move a1, a2
210 move a2, a3
211 lw a3, 16(sp)
212 lw t4, 20(sp)
213 lw t5, 24(sp)
214 lw t6, 28(sp)
215 sw t4, 16(sp)
216 sw t5, 20(sp)
217 sw t6, 24(sp)
218 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
219 sw a1, PT_R5(sp) # syscalls expect them there
220 sw a2, PT_R6(sp)
221 sw a3, PT_R7(sp)
222 sw a3, PT_R26(sp) # update a3 for syscall restarting
223 jr t2
224 /* Unreached */
226 einval: li v0, -ENOSYS
227 jr ra
228 END(sys_syscall)
230 .align 2
231 .type sys_call_table, @object
232 EXPORT(sys_call_table)
233 PTR sys_syscall /* 4000 */
234 PTR sys_exit
235 PTR __sys_fork
236 PTR sys_read
237 PTR sys_write
238 PTR sys_open /* 4005 */
239 PTR sys_close
240 PTR sys_waitpid
241 PTR sys_creat
242 PTR sys_link
243 PTR sys_unlink /* 4010 */
244 PTR sys_execve
245 PTR sys_chdir
246 PTR sys_time
247 PTR sys_mknod
248 PTR sys_chmod /* 4015 */
249 PTR sys_lchown
250 PTR sys_ni_syscall
251 PTR sys_ni_syscall /* was sys_stat */
252 PTR sys_lseek
253 PTR sys_getpid /* 4020 */
254 PTR sys_mount
255 PTR sys_oldumount
256 PTR sys_setuid
257 PTR sys_getuid
258 PTR sys_stime /* 4025 */
259 PTR sys_ptrace
260 PTR sys_alarm
261 PTR sys_ni_syscall /* was sys_fstat */
262 PTR sys_pause
263 PTR sys_utime /* 4030 */
264 PTR sys_ni_syscall
265 PTR sys_ni_syscall
266 PTR sys_access
267 PTR sys_nice
268 PTR sys_ni_syscall /* 4035 */
269 PTR sys_sync
270 PTR sys_kill
271 PTR sys_rename
272 PTR sys_mkdir
273 PTR sys_rmdir /* 4040 */
274 PTR sys_dup
275 PTR sysm_pipe
276 PTR sys_times
277 PTR sys_ni_syscall
278 PTR sys_brk /* 4045 */
279 PTR sys_setgid
280 PTR sys_getgid
281 PTR sys_ni_syscall /* was signal(2) */
282 PTR sys_geteuid
283 PTR sys_getegid /* 4050 */
284 PTR sys_acct
285 PTR sys_umount
286 PTR sys_ni_syscall
287 PTR sys_ioctl
288 PTR sys_fcntl /* 4055 */
289 PTR sys_ni_syscall
290 PTR sys_setpgid
291 PTR sys_ni_syscall
292 PTR sys_olduname
293 PTR sys_umask /* 4060 */
294 PTR sys_chroot
295 PTR sys_ustat
296 PTR sys_dup2
297 PTR sys_getppid
298 PTR sys_getpgrp /* 4065 */
299 PTR sys_setsid
300 PTR sys_sigaction
301 PTR sys_sgetmask
302 PTR sys_ssetmask
303 PTR sys_setreuid /* 4070 */
304 PTR sys_setregid
305 PTR sys_sigsuspend
306 PTR sys_sigpending
307 PTR sys_sethostname
308 PTR sys_setrlimit /* 4075 */
309 PTR sys_getrlimit
310 PTR sys_getrusage
311 PTR sys_gettimeofday
312 PTR sys_settimeofday
313 PTR sys_getgroups /* 4080 */
314 PTR sys_setgroups
315 PTR sys_ni_syscall /* old_select */
316 PTR sys_symlink
317 PTR sys_ni_syscall /* was sys_lstat */
318 PTR sys_readlink /* 4085 */
319 PTR sys_uselib
320 PTR sys_swapon
321 PTR sys_reboot
322 PTR sys_old_readdir
323 PTR sys_mips_mmap /* 4090 */
324 PTR sys_munmap
325 PTR sys_truncate
326 PTR sys_ftruncate
327 PTR sys_fchmod
328 PTR sys_fchown /* 4095 */
329 PTR sys_getpriority
330 PTR sys_setpriority
331 PTR sys_ni_syscall
332 PTR sys_statfs
333 PTR sys_fstatfs /* 4100 */
334 PTR sys_ni_syscall /* was ioperm(2) */
335 PTR sys_socketcall
336 PTR sys_syslog
337 PTR sys_setitimer
338 PTR sys_getitimer /* 4105 */
339 PTR sys_newstat
340 PTR sys_newlstat
341 PTR sys_newfstat
342 PTR sys_uname
343 PTR sys_ni_syscall /* 4110 was iopl(2) */
344 PTR sys_vhangup
345 PTR sys_ni_syscall /* was sys_idle() */
346 PTR sys_ni_syscall /* was sys_vm86 */
347 PTR sys_wait4
348 PTR sys_swapoff /* 4115 */
349 PTR sys_sysinfo
350 PTR sys_ipc
351 PTR sys_fsync
352 PTR sys_sigreturn
353 PTR __sys_clone /* 4120 */
354 PTR sys_setdomainname
355 PTR sys_newuname
356 PTR sys_ni_syscall /* sys_modify_ldt */
357 PTR sys_adjtimex
358 PTR sys_mprotect /* 4125 */
359 PTR sys_sigprocmask
360 PTR sys_ni_syscall /* was create_module */
361 PTR sys_init_module
362 PTR sys_delete_module
363 PTR sys_ni_syscall /* 4130 was get_kernel_syms */
364 PTR sys_quotactl
365 PTR sys_getpgid
366 PTR sys_fchdir
367 PTR sys_bdflush
368 PTR sys_sysfs /* 4135 */
369 PTR sys_personality
370 PTR sys_ni_syscall /* for afs_syscall */
371 PTR sys_setfsuid
372 PTR sys_setfsgid
373 PTR sys_llseek /* 4140 */
374 PTR sys_getdents
375 PTR sys_select
376 PTR sys_flock
377 PTR sys_msync
378 PTR sys_readv /* 4145 */
379 PTR sys_writev
380 PTR sys_cacheflush
381 PTR sys_cachectl
382 PTR sys_sysmips
383 PTR sys_ni_syscall /* 4150 */
384 PTR sys_getsid
385 PTR sys_fdatasync
386 PTR sys_sysctl
387 PTR sys_mlock
388 PTR sys_munlock /* 4155 */
389 PTR sys_mlockall
390 PTR sys_munlockall
391 PTR sys_sched_setparam
392 PTR sys_sched_getparam
393 PTR sys_sched_setscheduler /* 4160 */
394 PTR sys_sched_getscheduler
395 PTR sys_sched_yield
396 PTR sys_sched_get_priority_max
397 PTR sys_sched_get_priority_min
398 PTR sys_sched_rr_get_interval /* 4165 */
399 PTR sys_nanosleep
400 PTR sys_mremap
401 PTR sys_accept
402 PTR sys_bind
403 PTR sys_connect /* 4170 */
404 PTR sys_getpeername
405 PTR sys_getsockname
406 PTR sys_getsockopt
407 PTR sys_listen
408 PTR sys_recv /* 4175 */
409 PTR sys_recvfrom
410 PTR sys_recvmsg
411 PTR sys_send
412 PTR sys_sendmsg
413 PTR sys_sendto /* 4180 */
414 PTR sys_setsockopt
415 PTR sys_shutdown
416 PTR sys_socket
417 PTR sys_socketpair
418 PTR sys_setresuid /* 4185 */
419 PTR sys_getresuid
420 PTR sys_ni_syscall /* was sys_query_module */
421 PTR sys_poll
422 PTR sys_ni_syscall /* was nfsservctl */
423 PTR sys_setresgid /* 4190 */
424 PTR sys_getresgid
425 PTR sys_prctl
426 PTR sys_rt_sigreturn
427 PTR sys_rt_sigaction
428 PTR sys_rt_sigprocmask /* 4195 */
429 PTR sys_rt_sigpending
430 PTR sys_rt_sigtimedwait
431 PTR sys_rt_sigqueueinfo
432 PTR sys_rt_sigsuspend
433 PTR sys_pread64 /* 4200 */
434 PTR sys_pwrite64
435 PTR sys_chown
436 PTR sys_getcwd
437 PTR sys_capget
438 PTR sys_capset /* 4205 */
439 PTR sys_sigaltstack
440 PTR sys_sendfile
441 PTR sys_ni_syscall
442 PTR sys_ni_syscall
443 PTR sys_mips_mmap2 /* 4210 */
444 PTR sys_truncate64
445 PTR sys_ftruncate64
446 PTR sys_stat64
447 PTR sys_lstat64
448 PTR sys_fstat64 /* 4215 */
449 PTR sys_pivot_root
450 PTR sys_mincore
451 PTR sys_madvise
452 PTR sys_getdents64
453 PTR sys_fcntl64 /* 4220 */
454 PTR sys_ni_syscall
455 PTR sys_gettid
456 PTR sys_readahead
457 PTR sys_setxattr
458 PTR sys_lsetxattr /* 4225 */
459 PTR sys_fsetxattr
460 PTR sys_getxattr
461 PTR sys_lgetxattr
462 PTR sys_fgetxattr
463 PTR sys_listxattr /* 4230 */
464 PTR sys_llistxattr
465 PTR sys_flistxattr
466 PTR sys_removexattr
467 PTR sys_lremovexattr
468 PTR sys_fremovexattr /* 4235 */
469 PTR sys_tkill
470 PTR sys_sendfile64
471 PTR sys_futex
472 #ifdef CONFIG_MIPS_MT_FPAFF
473 /*
474 * For FPU affinity scheduling on MIPS MT processors, we need to
475 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
476 * in kernel/sched/core.c. Considered only temporary we only support
477 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor
478 * atm.
479 */
480 PTR mipsmt_sys_sched_setaffinity
481 PTR mipsmt_sys_sched_getaffinity
482 #else
483 PTR sys_sched_setaffinity
484 PTR sys_sched_getaffinity /* 4240 */
485 #endif /* CONFIG_MIPS_MT_FPAFF */
486 PTR sys_io_setup
487 PTR sys_io_destroy
488 PTR sys_io_getevents
489 PTR sys_io_submit
490 PTR sys_io_cancel /* 4245 */
491 PTR sys_exit_group
492 PTR sys_lookup_dcookie
493 PTR sys_epoll_create
494 PTR sys_epoll_ctl
495 PTR sys_epoll_wait /* 4250 */
496 PTR sys_remap_file_pages
497 PTR sys_set_tid_address
498 PTR sys_restart_syscall
499 PTR sys_fadvise64_64
500 PTR sys_statfs64 /* 4255 */
501 PTR sys_fstatfs64
502 PTR sys_timer_create
503 PTR sys_timer_settime
504 PTR sys_timer_gettime
505 PTR sys_timer_getoverrun /* 4260 */
506 PTR sys_timer_delete
507 PTR sys_clock_settime
508 PTR sys_clock_gettime
509 PTR sys_clock_getres
510 PTR sys_clock_nanosleep /* 4265 */
511 PTR sys_tgkill
512 PTR sys_utimes
513 PTR sys_mbind
514 PTR sys_get_mempolicy
515 PTR sys_set_mempolicy /* 4270 */
516 PTR sys_mq_open
517 PTR sys_mq_unlink
518 PTR sys_mq_timedsend
519 PTR sys_mq_timedreceive
520 PTR sys_mq_notify /* 4275 */
521 PTR sys_mq_getsetattr
522 PTR sys_ni_syscall /* sys_vserver */
523 PTR sys_waitid
524 PTR sys_ni_syscall /* available, was setaltroot */
525 PTR sys_add_key /* 4280 */
526 PTR sys_request_key
527 PTR sys_keyctl
528 PTR sys_set_thread_area
529 PTR sys_inotify_init
530 PTR sys_inotify_add_watch /* 4285 */
531 PTR sys_inotify_rm_watch
532 PTR sys_migrate_pages
533 PTR sys_openat
534 PTR sys_mkdirat
535 PTR sys_mknodat /* 4290 */
536 PTR sys_fchownat
537 PTR sys_futimesat
538 PTR sys_fstatat64
539 PTR sys_unlinkat
540 PTR sys_renameat /* 4295 */
541 PTR sys_linkat
542 PTR sys_symlinkat
543 PTR sys_readlinkat
544 PTR sys_fchmodat
545 PTR sys_faccessat /* 4300 */
546 PTR sys_pselect6
547 PTR sys_ppoll
548 PTR sys_unshare
549 PTR sys_splice
550 PTR sys_sync_file_range /* 4305 */
551 PTR sys_tee
552 PTR sys_vmsplice
553 PTR sys_move_pages
554 PTR sys_set_robust_list
555 PTR sys_get_robust_list /* 4310 */
556 PTR sys_kexec_load
557 PTR sys_getcpu
558 PTR sys_epoll_pwait
559 PTR sys_ioprio_set
560 PTR sys_ioprio_get /* 4315 */
561 PTR sys_utimensat
562 PTR sys_signalfd
563 PTR sys_ni_syscall /* was timerfd */
564 PTR sys_eventfd
565 PTR sys_fallocate /* 4320 */
566 PTR sys_timerfd_create
567 PTR sys_timerfd_gettime
568 PTR sys_timerfd_settime
569 PTR sys_signalfd4
570 PTR sys_eventfd2 /* 4325 */
571 PTR sys_epoll_create1
572 PTR sys_dup3
573 PTR sys_pipe2
574 PTR sys_inotify_init1
575 PTR sys_preadv /* 4330 */
576 PTR sys_pwritev
577 PTR sys_rt_tgsigqueueinfo
578 PTR sys_perf_event_open
579 PTR sys_accept4
580 PTR sys_recvmmsg /* 4335 */
581 PTR sys_fanotify_init
582 PTR sys_fanotify_mark
583 PTR sys_prlimit64
584 PTR sys_name_to_handle_at
585 PTR sys_open_by_handle_at /* 4340 */
586 PTR sys_clock_adjtime
587 PTR sys_syncfs
588 PTR sys_sendmmsg
589 PTR sys_setns
590 PTR sys_process_vm_readv /* 4345 */
591 PTR sys_process_vm_writev
592 PTR sys_kcmp
593 PTR sys_finit_module
594 PTR sys_sched_setattr
595 PTR sys_sched_getattr /* 4350 */
596 PTR sys_renameat2
597 PTR sys_seccomp
598 PTR sys_getrandom
599 PTR sys_memfd_create
600 PTR sys_bpf /* 4355 */
601 PTR sys_execveat