| blob | 744cd10ba599e260b97e0a53da6d872792f7bd54 |
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 1: user_lw(t5, 16(t0)) # argument #5 from usp
77 4: user_lw(t6, 20(t0)) # argument #6 from usp
78 3: user_lw(t7, 24(t0)) # argument #7 from usp
79 2: user_lw(t8, 28(t0)) # argument #8 from usp
81 sw t5, 16(sp) # argument #5 to ksp
82 sw t6, 20(sp) # argument #6 to ksp
83 sw t7, 24(sp) # argument #7 to ksp
84 sw t8, 28(sp) # argument #8 to ksp
85 .set pop
87 .section __ex_table,"a"
88 PTR 1b,bad_stack
89 PTR 2b,bad_stack
90 PTR 3b,bad_stack
91 PTR 4b,bad_stack
92 .previous
94 lw t0, TI_FLAGS($28) # syscall tracing enabled?
95 li t1, _TIF_WORK_SYSCALL_ENTRY
96 and t0, t1
97 bnez t0, syscall_trace_entry # -> yes
99 jalr t2 # Do The Real Thing (TM)
101 li t0, -EMAXERRNO - 1 # error?
102 sltu t0, t0, v0
103 sw t0, PT_R7(sp) # set error flag
104 beqz t0, 1f
106 lw t1, PT_R2(sp) # syscall number
107 negu v0 # error
108 sw t1, PT_R0(sp) # save it for syscall restarting
109 1: sw v0, PT_R2(sp) # result
111 o32_syscall_exit:
112 j syscall_exit_partial
114 /* ------------------------------------------------------------------------ */
116 syscall_trace_entry:
117 SAVE_STATIC
118 move s0, t2
119 move a0, sp
121 /*
122 * syscall number is in v0 unless we called syscall(__NR_###)
123 * where the real syscall number is in a0
124 */
125 addiu a1, v0, __NR_O32_Linux
126 bnez v0, 1f /* __NR_syscall at offset 0 */
127 lw a1, PT_R4(sp)
129 1: jal syscall_trace_enter
131 bltz v0, 2f # seccomp failed? Skip syscall
133 move t0, s0
134 RESTORE_STATIC
135 lw a0, PT_R4(sp) # Restore argument registers
136 lw a1, PT_R5(sp)
137 lw a2, PT_R6(sp)
138 lw a3, PT_R7(sp)
139 jalr t0
141 li t0, -EMAXERRNO - 1 # error?
142 sltu t0, t0, v0
143 sw t0, PT_R7(sp) # set error flag
144 beqz t0, 1f
146 lw t1, PT_R2(sp) # syscall number
147 negu v0 # error
148 sw t1, PT_R0(sp) # save it for syscall restarting
149 1: sw v0, PT_R2(sp) # result
151 2: j syscall_exit
153 /* ------------------------------------------------------------------------ */
155 /*
156 * The stackpointer for a call with more than 4 arguments is bad.
157 * We probably should handle this case a bit more drastic.
158 */
159 bad_stack:
160 li v0, EFAULT
161 sw v0, PT_R2(sp)
162 li t0, 1 # set error flag
163 sw t0, PT_R7(sp)
164 j o32_syscall_exit
166 /*
167 * The system call does not exist in this kernel
168 */
169 illegal_syscall:
170 li v0, ENOSYS # error
171 sw v0, PT_R2(sp)
172 li t0, 1 # set error flag
173 sw t0, PT_R7(sp)
174 j o32_syscall_exit
175 END(handle_sys)
177 LEAF(sys_syscall)
178 subu t0, a0, __NR_O32_Linux # check syscall number
179 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
180 beqz t0, einval # do not recurse
181 sll t1, t0, 2
182 beqz v0, einval
183 lw t2, sys_call_table(t1) # syscall routine
185 /* Some syscalls like execve get their arguments from struct pt_regs
186 and claim zero arguments in the syscall table. Thus we have to
187 assume the worst case and shuffle around all potential arguments.
188 If you want performance, don't use indirect syscalls. */
190 move a0, a1 # shift argument registers
191 move a1, a2
192 move a2, a3
193 lw a3, 16(sp)
194 lw t4, 20(sp)
195 lw t5, 24(sp)
196 lw t6, 28(sp)
197 sw t4, 16(sp)
198 sw t5, 20(sp)
199 sw t6, 24(sp)
200 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
201 sw a1, PT_R5(sp) # syscalls expect them there
202 sw a2, PT_R6(sp)
203 sw a3, PT_R7(sp)
204 sw a3, PT_R26(sp) # update a3 for syscall restarting
205 jr t2
206 /* Unreached */
208 einval: li v0, -ENOSYS
209 jr ra
210 END(sys_syscall)
212 .align 2
213 .type sys_call_table, @object
214 EXPORT(sys_call_table)
215 PTR sys_syscall /* 4000 */
216 PTR sys_exit
217 PTR __sys_fork
218 PTR sys_read
219 PTR sys_write
220 PTR sys_open /* 4005 */
221 PTR sys_close
222 PTR sys_waitpid
223 PTR sys_creat
224 PTR sys_link
225 PTR sys_unlink /* 4010 */
226 PTR sys_execve
227 PTR sys_chdir
228 PTR sys_time
229 PTR sys_mknod
230 PTR sys_chmod /* 4015 */
231 PTR sys_lchown
232 PTR sys_ni_syscall
233 PTR sys_ni_syscall /* was sys_stat */
234 PTR sys_lseek
235 PTR sys_getpid /* 4020 */
236 PTR sys_mount
237 PTR sys_oldumount
238 PTR sys_setuid
239 PTR sys_getuid
240 PTR sys_stime /* 4025 */
241 PTR sys_ptrace
242 PTR sys_alarm
243 PTR sys_ni_syscall /* was sys_fstat */
244 PTR sys_pause
245 PTR sys_utime /* 4030 */
246 PTR sys_ni_syscall
247 PTR sys_ni_syscall
248 PTR sys_access
249 PTR sys_nice
250 PTR sys_ni_syscall /* 4035 */
251 PTR sys_sync
252 PTR sys_kill
253 PTR sys_rename
254 PTR sys_mkdir
255 PTR sys_rmdir /* 4040 */
256 PTR sys_dup
257 PTR sysm_pipe
258 PTR sys_times
259 PTR sys_ni_syscall
260 PTR sys_brk /* 4045 */
261 PTR sys_setgid
262 PTR sys_getgid
263 PTR sys_ni_syscall /* was signal(2) */
264 PTR sys_geteuid
265 PTR sys_getegid /* 4050 */
266 PTR sys_acct
267 PTR sys_umount
268 PTR sys_ni_syscall
269 PTR sys_ioctl
270 PTR sys_fcntl /* 4055 */
271 PTR sys_ni_syscall
272 PTR sys_setpgid
273 PTR sys_ni_syscall
274 PTR sys_olduname
275 PTR sys_umask /* 4060 */
276 PTR sys_chroot
277 PTR sys_ustat
278 PTR sys_dup2
279 PTR sys_getppid
280 PTR sys_getpgrp /* 4065 */
281 PTR sys_setsid
282 PTR sys_sigaction
283 PTR sys_sgetmask
284 PTR sys_ssetmask
285 PTR sys_setreuid /* 4070 */
286 PTR sys_setregid
287 PTR sys_sigsuspend
288 PTR sys_sigpending
289 PTR sys_sethostname
290 PTR sys_setrlimit /* 4075 */
291 PTR sys_getrlimit
292 PTR sys_getrusage
293 PTR sys_gettimeofday
294 PTR sys_settimeofday
295 PTR sys_getgroups /* 4080 */
296 PTR sys_setgroups
297 PTR sys_ni_syscall /* old_select */
298 PTR sys_symlink
299 PTR sys_ni_syscall /* was sys_lstat */
300 PTR sys_readlink /* 4085 */
301 PTR sys_uselib
302 PTR sys_swapon
303 PTR sys_reboot
304 PTR sys_old_readdir
305 PTR sys_mips_mmap /* 4090 */
306 PTR sys_munmap
307 PTR sys_truncate
308 PTR sys_ftruncate
309 PTR sys_fchmod
310 PTR sys_fchown /* 4095 */
311 PTR sys_getpriority
312 PTR sys_setpriority
313 PTR sys_ni_syscall
314 PTR sys_statfs
315 PTR sys_fstatfs /* 4100 */
316 PTR sys_ni_syscall /* was ioperm(2) */
317 PTR sys_socketcall
318 PTR sys_syslog
319 PTR sys_setitimer
320 PTR sys_getitimer /* 4105 */
321 PTR sys_newstat
322 PTR sys_newlstat
323 PTR sys_newfstat
324 PTR sys_uname
325 PTR sys_ni_syscall /* 4110 was iopl(2) */
326 PTR sys_vhangup
327 PTR sys_ni_syscall /* was sys_idle() */
328 PTR sys_ni_syscall /* was sys_vm86 */
329 PTR sys_wait4
330 PTR sys_swapoff /* 4115 */
331 PTR sys_sysinfo
332 PTR sys_ipc
333 PTR sys_fsync
334 PTR sys_sigreturn
335 PTR __sys_clone /* 4120 */
336 PTR sys_setdomainname
337 PTR sys_newuname
338 PTR sys_ni_syscall /* sys_modify_ldt */
339 PTR sys_adjtimex
340 PTR sys_mprotect /* 4125 */
341 PTR sys_sigprocmask
342 PTR sys_ni_syscall /* was create_module */
343 PTR sys_init_module
344 PTR sys_delete_module
345 PTR sys_ni_syscall /* 4130 was get_kernel_syms */
346 PTR sys_quotactl
347 PTR sys_getpgid
348 PTR sys_fchdir
349 PTR sys_bdflush
350 PTR sys_sysfs /* 4135 */
351 PTR sys_personality
352 PTR sys_ni_syscall /* for afs_syscall */
353 PTR sys_setfsuid
354 PTR sys_setfsgid
355 PTR sys_llseek /* 4140 */
356 PTR sys_getdents
357 PTR sys_select
358 PTR sys_flock
359 PTR sys_msync
360 PTR sys_readv /* 4145 */
361 PTR sys_writev
362 PTR sys_cacheflush
363 PTR sys_cachectl
364 PTR sys_sysmips
365 PTR sys_ni_syscall /* 4150 */
366 PTR sys_getsid
367 PTR sys_fdatasync
368 PTR sys_sysctl
369 PTR sys_mlock
370 PTR sys_munlock /* 4155 */
371 PTR sys_mlockall
372 PTR sys_munlockall
373 PTR sys_sched_setparam
374 PTR sys_sched_getparam
375 PTR sys_sched_setscheduler /* 4160 */
376 PTR sys_sched_getscheduler
377 PTR sys_sched_yield
378 PTR sys_sched_get_priority_max
379 PTR sys_sched_get_priority_min
380 PTR sys_sched_rr_get_interval /* 4165 */
381 PTR sys_nanosleep
382 PTR sys_mremap
383 PTR sys_accept
384 PTR sys_bind
385 PTR sys_connect /* 4170 */
386 PTR sys_getpeername
387 PTR sys_getsockname
388 PTR sys_getsockopt
389 PTR sys_listen
390 PTR sys_recv /* 4175 */
391 PTR sys_recvfrom
392 PTR sys_recvmsg
393 PTR sys_send
394 PTR sys_sendmsg
395 PTR sys_sendto /* 4180 */
396 PTR sys_setsockopt
397 PTR sys_shutdown
398 PTR sys_socket
399 PTR sys_socketpair
400 PTR sys_setresuid /* 4185 */
401 PTR sys_getresuid
402 PTR sys_ni_syscall /* was sys_query_module */
403 PTR sys_poll
404 PTR sys_ni_syscall /* was nfsservctl */
405 PTR sys_setresgid /* 4190 */
406 PTR sys_getresgid
407 PTR sys_prctl
408 PTR sys_rt_sigreturn
409 PTR sys_rt_sigaction
410 PTR sys_rt_sigprocmask /* 4195 */
411 PTR sys_rt_sigpending
412 PTR sys_rt_sigtimedwait
413 PTR sys_rt_sigqueueinfo
414 PTR sys_rt_sigsuspend
415 PTR sys_pread64 /* 4200 */
416 PTR sys_pwrite64
417 PTR sys_chown
418 PTR sys_getcwd
419 PTR sys_capget
420 PTR sys_capset /* 4205 */
421 PTR sys_sigaltstack
422 PTR sys_sendfile
423 PTR sys_ni_syscall
424 PTR sys_ni_syscall
425 PTR sys_mips_mmap2 /* 4210 */
426 PTR sys_truncate64
427 PTR sys_ftruncate64
428 PTR sys_stat64
429 PTR sys_lstat64
430 PTR sys_fstat64 /* 4215 */
431 PTR sys_pivot_root
432 PTR sys_mincore
433 PTR sys_madvise
434 PTR sys_getdents64
435 PTR sys_fcntl64 /* 4220 */
436 PTR sys_ni_syscall
437 PTR sys_gettid
438 PTR sys_readahead
439 PTR sys_setxattr
440 PTR sys_lsetxattr /* 4225 */
441 PTR sys_fsetxattr
442 PTR sys_getxattr
443 PTR sys_lgetxattr
444 PTR sys_fgetxattr
445 PTR sys_listxattr /* 4230 */
446 PTR sys_llistxattr
447 PTR sys_flistxattr
448 PTR sys_removexattr
449 PTR sys_lremovexattr
450 PTR sys_fremovexattr /* 4235 */
451 PTR sys_tkill
452 PTR sys_sendfile64
453 PTR sys_futex
454 #ifdef CONFIG_MIPS_MT_FPAFF
455 /*
456 * For FPU affinity scheduling on MIPS MT processors, we need to
457 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
458 * in kernel/sched/core.c. Considered only temporary we only support
459 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor
460 * atm.
461 */
462 PTR mipsmt_sys_sched_setaffinity
463 PTR mipsmt_sys_sched_getaffinity
464 #else
465 PTR sys_sched_setaffinity
466 PTR sys_sched_getaffinity /* 4240 */
467 #endif /* CONFIG_MIPS_MT_FPAFF */
468 PTR sys_io_setup
469 PTR sys_io_destroy
470 PTR sys_io_getevents
471 PTR sys_io_submit
472 PTR sys_io_cancel /* 4245 */
473 PTR sys_exit_group
474 PTR sys_lookup_dcookie
475 PTR sys_epoll_create
476 PTR sys_epoll_ctl
477 PTR sys_epoll_wait /* 4250 */
478 PTR sys_remap_file_pages
479 PTR sys_set_tid_address
480 PTR sys_restart_syscall
481 PTR sys_fadvise64_64
482 PTR sys_statfs64 /* 4255 */
483 PTR sys_fstatfs64
484 PTR sys_timer_create
485 PTR sys_timer_settime
486 PTR sys_timer_gettime
487 PTR sys_timer_getoverrun /* 4260 */
488 PTR sys_timer_delete
489 PTR sys_clock_settime
490 PTR sys_clock_gettime
491 PTR sys_clock_getres
492 PTR sys_clock_nanosleep /* 4265 */
493 PTR sys_tgkill
494 PTR sys_utimes
495 PTR sys_mbind
496 PTR sys_get_mempolicy
497 PTR sys_set_mempolicy /* 4270 */
498 PTR sys_mq_open
499 PTR sys_mq_unlink
500 PTR sys_mq_timedsend
501 PTR sys_mq_timedreceive
502 PTR sys_mq_notify /* 4275 */
503 PTR sys_mq_getsetattr
504 PTR sys_ni_syscall /* sys_vserver */
505 PTR sys_waitid
506 PTR sys_ni_syscall /* available, was setaltroot */
507 PTR sys_add_key /* 4280 */
508 PTR sys_request_key
509 PTR sys_keyctl
510 PTR sys_set_thread_area
511 PTR sys_inotify_init
512 PTR sys_inotify_add_watch /* 4285 */
513 PTR sys_inotify_rm_watch
514 PTR sys_migrate_pages
515 PTR sys_openat
516 PTR sys_mkdirat
517 PTR sys_mknodat /* 4290 */
518 PTR sys_fchownat
519 PTR sys_futimesat
520 PTR sys_fstatat64
521 PTR sys_unlinkat
522 PTR sys_renameat /* 4295 */
523 PTR sys_linkat
524 PTR sys_symlinkat
525 PTR sys_readlinkat
526 PTR sys_fchmodat
527 PTR sys_faccessat /* 4300 */
528 PTR sys_pselect6
529 PTR sys_ppoll
530 PTR sys_unshare
531 PTR sys_splice
532 PTR sys_sync_file_range /* 4305 */
533 PTR sys_tee
534 PTR sys_vmsplice
535 PTR sys_move_pages
536 PTR sys_set_robust_list
537 PTR sys_get_robust_list /* 4310 */
538 PTR sys_kexec_load
539 PTR sys_getcpu
540 PTR sys_epoll_pwait
541 PTR sys_ioprio_set
542 PTR sys_ioprio_get /* 4315 */
543 PTR sys_utimensat
544 PTR sys_signalfd
545 PTR sys_ni_syscall /* was timerfd */
546 PTR sys_eventfd
547 PTR sys_fallocate /* 4320 */
548 PTR sys_timerfd_create
549 PTR sys_timerfd_gettime
550 PTR sys_timerfd_settime
551 PTR sys_signalfd4
552 PTR sys_eventfd2 /* 4325 */
553 PTR sys_epoll_create1
554 PTR sys_dup3
555 PTR sys_pipe2
556 PTR sys_inotify_init1
557 PTR sys_preadv /* 4330 */
558 PTR sys_pwritev
559 PTR sys_rt_tgsigqueueinfo
560 PTR sys_perf_event_open
561 PTR sys_accept4
562 PTR sys_recvmmsg /* 4335 */
563 PTR sys_fanotify_init
564 PTR sys_fanotify_mark
565 PTR sys_prlimit64
566 PTR sys_name_to_handle_at
567 PTR sys_open_by_handle_at /* 4340 */
568 PTR sys_clock_adjtime
569 PTR sys_syncfs
570 PTR sys_sendmmsg
571 PTR sys_setns
572 PTR sys_process_vm_readv /* 4345 */
573 PTR sys_process_vm_writev
574 PTR sys_kcmp
575 PTR sys_finit_module
576 PTR sys_sched_setattr
577 PTR sys_sched_getattr /* 4350 */
578 PTR sys_renameat2
579 PTR sys_seccomp
580 PTR sys_getrandom
581 PTR sys_memfd_create