| blob | c8e43e0c4066b599fd24b1135eebac0129252d17 |
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 addiu t1, 4 # skip to next instruction
39 sw t1, PT_EPC(sp)
41 sw a3, PT_R26(sp) # save a3 for syscall restarting
43 /*
44 * More than four arguments. Try to deal with it by copying the
45 * stack arguments from the user stack to the kernel stack.
46 * This Sucks (TM).
47 */
48 lw t0, PT_R29(sp) # get old user stack pointer
50 /*
51 * We intentionally keep the kernel stack a little below the top of
52 * userspace so we don't have to do a slower byte accurate check here.
53 */
54 lw t5, TI_ADDR_LIMIT($28)
55 addu t4, t0, 32
56 and t5, t4
57 bltz t5, bad_stack # -> sp is bad
59 /*
60 * Ok, copy the args from the luser stack to the kernel stack.
61 */
63 .set push
64 .set noreorder
65 .set nomacro
67 load_a4: user_lw(t5, 16(t0)) # argument #5 from usp
68 load_a5: user_lw(t6, 20(t0)) # argument #6 from usp
69 load_a6: user_lw(t7, 24(t0)) # argument #7 from usp
70 load_a7: user_lw(t8, 28(t0)) # argument #8 from usp
71 loads_done:
73 sw t5, 16(sp) # argument #5 to ksp
74 sw t6, 20(sp) # argument #6 to ksp
75 sw t7, 24(sp) # argument #7 to ksp
76 sw t8, 28(sp) # argument #8 to ksp
77 .set pop
79 .section __ex_table,"a"
80 PTR load_a4, bad_stack_a4
81 PTR load_a5, bad_stack_a5
82 PTR load_a6, bad_stack_a6
83 PTR load_a7, bad_stack_a7
84 .previous
86 lw t0, TI_FLAGS($28) # syscall tracing enabled?
87 li t1, _TIF_WORK_SYSCALL_ENTRY
88 and t0, t1
89 bnez t0, syscall_trace_entry # -> yes
90 syscall_common:
91 subu v0, v0, __NR_O32_Linux # check syscall number
92 sltiu t0, v0, __NR_O32_Linux_syscalls + 1
93 beqz t0, illegal_syscall
95 sll t0, v0, 2
96 la t1, sys_call_table
97 addu t1, t0
98 lw t2, (t1) # syscall routine
100 beqz t2, illegal_syscall
102 jalr t2 # Do The Real Thing (TM)
104 li t0, -EMAXERRNO - 1 # error?
105 sltu t0, t0, v0
106 sw t0, PT_R7(sp) # set error flag
107 beqz t0, 1f
109 lw t1, PT_R2(sp) # syscall number
110 negu v0 # error
111 sw t1, PT_R0(sp) # save it for syscall restarting
112 1: sw v0, PT_R2(sp) # result
114 o32_syscall_exit:
115 j syscall_exit_partial
117 /* ------------------------------------------------------------------------ */
119 syscall_trace_entry:
120 SAVE_STATIC
121 move a0, sp
123 /*
124 * syscall number is in v0 unless we called syscall(__NR_###)
125 * where the real syscall number is in a0
126 */
127 move a1, v0
128 subu t2, v0, __NR_O32_Linux
129 bnez t2, 1f /* __NR_syscall at offset 0 */
130 lw a1, PT_R4(sp)
132 1: jal syscall_trace_enter
134 bltz v0, 1f # seccomp failed? Skip syscall
136 RESTORE_STATIC
137 lw v0, PT_R2(sp) # Restore syscall (maybe modified)
138 lw a0, PT_R4(sp) # Restore argument registers
139 lw a1, PT_R5(sp)
140 lw a2, PT_R6(sp)
141 lw a3, PT_R7(sp)
142 j syscall_common
144 1: j syscall_exit
146 /* ------------------------------------------------------------------------ */
148 /*
149 * Our open-coded access area sanity test for the stack pointer
150 * failed. We probably should handle this case a bit more drastic.
151 */
152 bad_stack:
153 li v0, EFAULT
154 sw v0, PT_R2(sp)
155 li t0, 1 # set error flag
156 sw t0, PT_R7(sp)
157 j o32_syscall_exit
159 bad_stack_a4:
160 li t5, 0
161 b load_a5
163 bad_stack_a5:
164 li t6, 0
165 b load_a6
167 bad_stack_a6:
168 li t7, 0
169 b load_a7
171 bad_stack_a7:
172 li t8, 0
173 b loads_done
175 /*
176 * The system call does not exist in this kernel
177 */
178 illegal_syscall:
179 li v0, ENOSYS # error
180 sw v0, PT_R2(sp)
181 li t0, 1 # set error flag
182 sw t0, PT_R7(sp)
183 j o32_syscall_exit
184 END(handle_sys)
186 LEAF(sys_syscall)
187 subu t0, a0, __NR_O32_Linux # check syscall number
188 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
189 beqz t0, einval # do not recurse
190 sll t1, t0, 2
191 beqz v0, einval
192 lw t2, sys_call_table(t1) # syscall routine
193 sw a0, PT_R2(sp) # call routine directly on restart
195 /* Some syscalls like execve get their arguments from struct pt_regs
196 and claim zero arguments in the syscall table. Thus we have to
197 assume the worst case and shuffle around all potential arguments.
198 If you want performance, don't use indirect syscalls. */
200 move a0, a1 # shift argument registers
201 move a1, a2
202 move a2, a3
203 lw a3, 16(sp)
204 lw t4, 20(sp)
205 lw t5, 24(sp)
206 lw t6, 28(sp)
207 sw t4, 16(sp)
208 sw t5, 20(sp)
209 sw t6, 24(sp)
210 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
211 sw a1, PT_R5(sp) # syscalls expect them there
212 sw a2, PT_R6(sp)
213 sw a3, PT_R7(sp)
214 sw a3, PT_R26(sp) # update a3 for syscall restarting
215 jr t2
216 /* Unreached */
218 einval: li v0, -ENOSYS
219 jr ra
220 END(sys_syscall)
222 .align 2
223 .type sys_call_table, @object
224 EXPORT(sys_call_table)
225 PTR sys_syscall /* 4000 */
226 PTR sys_exit
227 PTR __sys_fork
228 PTR sys_read
229 PTR sys_write
230 PTR sys_open /* 4005 */
231 PTR sys_close
232 PTR sys_waitpid
233 PTR sys_creat
234 PTR sys_link
235 PTR sys_unlink /* 4010 */
236 PTR sys_execve
237 PTR sys_chdir
238 PTR sys_time
239 PTR sys_mknod
240 PTR sys_chmod /* 4015 */
241 PTR sys_lchown
242 PTR sys_ni_syscall
243 PTR sys_ni_syscall /* was sys_stat */
244 PTR sys_lseek
245 PTR sys_getpid /* 4020 */
246 PTR sys_mount
247 PTR sys_oldumount
248 PTR sys_setuid
249 PTR sys_getuid
250 PTR sys_stime /* 4025 */
251 PTR sys_ptrace
252 PTR sys_alarm
253 PTR sys_ni_syscall /* was sys_fstat */
254 PTR sys_pause
255 PTR sys_utime /* 4030 */
256 PTR sys_ni_syscall
257 PTR sys_ni_syscall
258 PTR sys_access
259 PTR sys_nice
260 PTR sys_ni_syscall /* 4035 */
261 PTR sys_sync
262 PTR sys_kill
263 PTR sys_rename
264 PTR sys_mkdir
265 PTR sys_rmdir /* 4040 */
266 PTR sys_dup
267 PTR sysm_pipe
268 PTR sys_times
269 PTR sys_ni_syscall
270 PTR sys_brk /* 4045 */
271 PTR sys_setgid
272 PTR sys_getgid
273 PTR sys_ni_syscall /* was signal(2) */
274 PTR sys_geteuid
275 PTR sys_getegid /* 4050 */
276 PTR sys_acct
277 PTR sys_umount
278 PTR sys_ni_syscall
279 PTR sys_ioctl
280 PTR sys_fcntl /* 4055 */
281 PTR sys_ni_syscall
282 PTR sys_setpgid
283 PTR sys_ni_syscall
284 PTR sys_olduname
285 PTR sys_umask /* 4060 */
286 PTR sys_chroot
287 PTR sys_ustat
288 PTR sys_dup2
289 PTR sys_getppid
290 PTR sys_getpgrp /* 4065 */
291 PTR sys_setsid
292 PTR sys_sigaction
293 PTR sys_sgetmask
294 PTR sys_ssetmask
295 PTR sys_setreuid /* 4070 */
296 PTR sys_setregid
297 PTR sys_sigsuspend
298 PTR sys_sigpending
299 PTR sys_sethostname
300 PTR sys_setrlimit /* 4075 */
301 PTR sys_getrlimit
302 PTR sys_getrusage
303 PTR sys_gettimeofday
304 PTR sys_settimeofday
305 PTR sys_getgroups /* 4080 */
306 PTR sys_setgroups
307 PTR sys_ni_syscall /* old_select */
308 PTR sys_symlink
309 PTR sys_ni_syscall /* was sys_lstat */
310 PTR sys_readlink /* 4085 */
311 PTR sys_uselib
312 PTR sys_swapon
313 PTR sys_reboot
314 PTR sys_old_readdir
315 PTR sys_mips_mmap /* 4090 */
316 PTR sys_munmap
317 PTR sys_truncate
318 PTR sys_ftruncate
319 PTR sys_fchmod
320 PTR sys_fchown /* 4095 */
321 PTR sys_getpriority
322 PTR sys_setpriority
323 PTR sys_ni_syscall
324 PTR sys_statfs
325 PTR sys_fstatfs /* 4100 */
326 PTR sys_ni_syscall /* was ioperm(2) */
327 PTR sys_socketcall
328 PTR sys_syslog
329 PTR sys_setitimer
330 PTR sys_getitimer /* 4105 */
331 PTR sys_newstat
332 PTR sys_newlstat
333 PTR sys_newfstat
334 PTR sys_uname
335 PTR sys_ni_syscall /* 4110 was iopl(2) */
336 PTR sys_vhangup
337 PTR sys_ni_syscall /* was sys_idle() */
338 PTR sys_ni_syscall /* was sys_vm86 */
339 PTR sys_wait4
340 PTR sys_swapoff /* 4115 */
341 PTR sys_sysinfo
342 PTR sys_ipc
343 PTR sys_fsync
344 PTR sys_sigreturn
345 PTR __sys_clone /* 4120 */
346 PTR sys_setdomainname
347 PTR sys_newuname
348 PTR sys_ni_syscall /* sys_modify_ldt */
349 PTR sys_adjtimex
350 PTR sys_mprotect /* 4125 */
351 PTR sys_sigprocmask
352 PTR sys_ni_syscall /* was create_module */
353 PTR sys_init_module
354 PTR sys_delete_module
355 PTR sys_ni_syscall /* 4130 was get_kernel_syms */
356 PTR sys_quotactl
357 PTR sys_getpgid
358 PTR sys_fchdir
359 PTR sys_bdflush
360 PTR sys_sysfs /* 4135 */
361 PTR sys_personality
362 PTR sys_ni_syscall /* for afs_syscall */
363 PTR sys_setfsuid
364 PTR sys_setfsgid
365 PTR sys_llseek /* 4140 */
366 PTR sys_getdents
367 PTR sys_select
368 PTR sys_flock
369 PTR sys_msync
370 PTR sys_readv /* 4145 */
371 PTR sys_writev
372 PTR sys_cacheflush
373 PTR sys_cachectl
374 PTR sys_sysmips
375 PTR sys_ni_syscall /* 4150 */
376 PTR sys_getsid
377 PTR sys_fdatasync
378 PTR sys_sysctl
379 PTR sys_mlock
380 PTR sys_munlock /* 4155 */
381 PTR sys_mlockall
382 PTR sys_munlockall
383 PTR sys_sched_setparam
384 PTR sys_sched_getparam
385 PTR sys_sched_setscheduler /* 4160 */
386 PTR sys_sched_getscheduler
387 PTR sys_sched_yield
388 PTR sys_sched_get_priority_max
389 PTR sys_sched_get_priority_min
390 PTR sys_sched_rr_get_interval /* 4165 */
391 PTR sys_nanosleep
392 PTR sys_mremap
393 PTR sys_accept
394 PTR sys_bind
395 PTR sys_connect /* 4170 */
396 PTR sys_getpeername
397 PTR sys_getsockname
398 PTR sys_getsockopt
399 PTR sys_listen
400 PTR sys_recv /* 4175 */
401 PTR sys_recvfrom
402 PTR sys_recvmsg
403 PTR sys_send
404 PTR sys_sendmsg
405 PTR sys_sendto /* 4180 */
406 PTR sys_setsockopt
407 PTR sys_shutdown
408 PTR sys_socket
409 PTR sys_socketpair
410 PTR sys_setresuid /* 4185 */
411 PTR sys_getresuid
412 PTR sys_ni_syscall /* was sys_query_module */
413 PTR sys_poll
414 PTR sys_ni_syscall /* was nfsservctl */
415 PTR sys_setresgid /* 4190 */
416 PTR sys_getresgid
417 PTR sys_prctl
418 PTR sys_rt_sigreturn
419 PTR sys_rt_sigaction
420 PTR sys_rt_sigprocmask /* 4195 */
421 PTR sys_rt_sigpending
422 PTR sys_rt_sigtimedwait
423 PTR sys_rt_sigqueueinfo
424 PTR sys_rt_sigsuspend
425 PTR sys_pread64 /* 4200 */
426 PTR sys_pwrite64
427 PTR sys_chown
428 PTR sys_getcwd
429 PTR sys_capget
430 PTR sys_capset /* 4205 */
431 PTR sys_sigaltstack
432 PTR sys_sendfile
433 PTR sys_ni_syscall
434 PTR sys_ni_syscall
435 PTR sys_mips_mmap2 /* 4210 */
436 PTR sys_truncate64
437 PTR sys_ftruncate64
438 PTR sys_stat64
439 PTR sys_lstat64
440 PTR sys_fstat64 /* 4215 */
441 PTR sys_pivot_root
442 PTR sys_mincore
443 PTR sys_madvise
444 PTR sys_getdents64
445 PTR sys_fcntl64 /* 4220 */
446 PTR sys_ni_syscall
447 PTR sys_gettid
448 PTR sys_readahead
449 PTR sys_setxattr
450 PTR sys_lsetxattr /* 4225 */
451 PTR sys_fsetxattr
452 PTR sys_getxattr
453 PTR sys_lgetxattr
454 PTR sys_fgetxattr
455 PTR sys_listxattr /* 4230 */
456 PTR sys_llistxattr
457 PTR sys_flistxattr
458 PTR sys_removexattr
459 PTR sys_lremovexattr
460 PTR sys_fremovexattr /* 4235 */
461 PTR sys_tkill
462 PTR sys_sendfile64
463 PTR sys_futex
464 #ifdef CONFIG_MIPS_MT_FPAFF
465 /*
466 * For FPU affinity scheduling on MIPS MT processors, we need to
467 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
468 * in kernel/sched/core.c. Considered only temporary we only support
469 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor
470 * atm.
471 */
472 PTR mipsmt_sys_sched_setaffinity
473 PTR mipsmt_sys_sched_getaffinity
474 #else
475 PTR sys_sched_setaffinity
476 PTR sys_sched_getaffinity /* 4240 */
477 #endif /* CONFIG_MIPS_MT_FPAFF */
478 PTR sys_io_setup
479 PTR sys_io_destroy
480 PTR sys_io_getevents
481 PTR sys_io_submit
482 PTR sys_io_cancel /* 4245 */
483 PTR sys_exit_group
484 PTR sys_lookup_dcookie
485 PTR sys_epoll_create
486 PTR sys_epoll_ctl
487 PTR sys_epoll_wait /* 4250 */
488 PTR sys_remap_file_pages
489 PTR sys_set_tid_address
490 PTR sys_restart_syscall
491 PTR sys_fadvise64_64
492 PTR sys_statfs64 /* 4255 */
493 PTR sys_fstatfs64
494 PTR sys_timer_create
495 PTR sys_timer_settime
496 PTR sys_timer_gettime
497 PTR sys_timer_getoverrun /* 4260 */
498 PTR sys_timer_delete
499 PTR sys_clock_settime
500 PTR sys_clock_gettime
501 PTR sys_clock_getres
502 PTR sys_clock_nanosleep /* 4265 */
503 PTR sys_tgkill
504 PTR sys_utimes
505 PTR sys_mbind
506 PTR sys_get_mempolicy
507 PTR sys_set_mempolicy /* 4270 */
508 PTR sys_mq_open
509 PTR sys_mq_unlink
510 PTR sys_mq_timedsend
511 PTR sys_mq_timedreceive
512 PTR sys_mq_notify /* 4275 */
513 PTR sys_mq_getsetattr
514 PTR sys_ni_syscall /* sys_vserver */
515 PTR sys_waitid
516 PTR sys_ni_syscall /* available, was setaltroot */
517 PTR sys_add_key /* 4280 */
518 PTR sys_request_key
519 PTR sys_keyctl
520 PTR sys_set_thread_area
521 PTR sys_inotify_init
522 PTR sys_inotify_add_watch /* 4285 */
523 PTR sys_inotify_rm_watch
524 PTR sys_migrate_pages
525 PTR sys_openat
526 PTR sys_mkdirat
527 PTR sys_mknodat /* 4290 */
528 PTR sys_fchownat
529 PTR sys_futimesat
530 PTR sys_fstatat64
531 PTR sys_unlinkat
532 PTR sys_renameat /* 4295 */
533 PTR sys_linkat
534 PTR sys_symlinkat
535 PTR sys_readlinkat
536 PTR sys_fchmodat
537 PTR sys_faccessat /* 4300 */
538 PTR sys_pselect6
539 PTR sys_ppoll
540 PTR sys_unshare
541 PTR sys_splice
542 PTR sys_sync_file_range /* 4305 */
543 PTR sys_tee
544 PTR sys_vmsplice
545 PTR sys_move_pages
546 PTR sys_set_robust_list
547 PTR sys_get_robust_list /* 4310 */
548 PTR sys_kexec_load
549 PTR sys_getcpu
550 PTR sys_epoll_pwait
551 PTR sys_ioprio_set
552 PTR sys_ioprio_get /* 4315 */
553 PTR sys_utimensat
554 PTR sys_signalfd
555 PTR sys_ni_syscall /* was timerfd */
556 PTR sys_eventfd
557 PTR sys_fallocate /* 4320 */
558 PTR sys_timerfd_create
559 PTR sys_timerfd_gettime
560 PTR sys_timerfd_settime
561 PTR sys_signalfd4
562 PTR sys_eventfd2 /* 4325 */
563 PTR sys_epoll_create1
564 PTR sys_dup3
565 PTR sys_pipe2
566 PTR sys_inotify_init1
567 PTR sys_preadv /* 4330 */
568 PTR sys_pwritev
569 PTR sys_rt_tgsigqueueinfo
570 PTR sys_perf_event_open
571 PTR sys_accept4
572 PTR sys_recvmmsg /* 4335 */
573 PTR sys_fanotify_init
574 PTR sys_fanotify_mark
575 PTR sys_prlimit64
576 PTR sys_name_to_handle_at
577 PTR sys_open_by_handle_at /* 4340 */
578 PTR sys_clock_adjtime
579 PTR sys_syncfs
580 PTR sys_sendmmsg
581 PTR sys_setns
582 PTR sys_process_vm_readv /* 4345 */
583 PTR sys_process_vm_writev
584 PTR sys_kcmp
585 PTR sys_finit_module
586 PTR sys_sched_setattr
587 PTR sys_sched_getattr /* 4350 */
588 PTR sys_renameat2
589 PTR sys_seccomp
590 PTR sys_getrandom
591 PTR sys_memfd_create
592 PTR sys_bpf /* 4355 */
593 PTR sys_execveat
594 PTR sys_userfaultfd
595 PTR sys_membarrier
596 PTR sys_mlock2
597 PTR sys_copy_file_range /* 4360 */
598 PTR sys_preadv2
599 PTR sys_pwritev2