| blob | fd2a9bb620d6618399e315e3155020a319d2671f |
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>
24 /* Highest syscall used of any syscall flavour */
25 #define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
27 .align 5
28 NESTED(handle_sys, PT_SIZE, sp)
29 .set noat
30 SAVE_SOME
31 TRACE_IRQS_ON_RELOAD
32 STI
33 .set at
35 lw t1, PT_EPC(sp) # skip syscall on return
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
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
50 sw a3, PT_R26(sp) # save a3 for syscall restarting
51 bgez t3, stackargs
53 stack_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
59 jalr t2 # Do The Real Thing (TM)
61 li t0, -EMAXERRNO - 1 # error?
62 sltu t0, t0, v0
63 sw t0, PT_R7(sp) # set error flag
64 beqz t0, 1f
66 negu v0 # error
67 sw v0, PT_R0(sp) # set flag for syscall
68 # restarting
69 1: sw v0, PT_R2(sp) # result
71 o32_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
80 j restore_partial
82 o32_syscall_exit_work:
83 j syscall_exit_work_partial
85 /* ------------------------------------------------------------------------ */
87 syscall_trace_entry:
88 SAVE_STATIC
89 move s0, t2
90 move a0, sp
91 li a1, 0
92 jal do_syscall_trace
94 move t0, s0
95 RESTORE_STATIC
96 lw a0, PT_R4(sp) # Restore argument registers
97 lw a1, PT_R5(sp)
98 lw a2, PT_R6(sp)
99 lw a3, PT_R7(sp)
100 jalr t0
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 negu v0 # error
108 sw v0, PT_R0(sp) # set flag for syscall
109 # restarting
110 1: sw v0, PT_R2(sp) # result
112 j syscall_exit
114 /* ------------------------------------------------------------------------ */
116 /*
117 * More than four arguments. Try to deal with it by copying the
118 * stack arguments from the user stack to the kernel stack.
119 * This Sucks (TM).
120 */
121 stackargs:
122 lw t0, PT_R29(sp) # get old user stack pointer
124 /*
125 * We intentionally keep the kernel stack a little below the top of
126 * userspace so we don't have to do a slower byte accurate check here.
127 */
128 lw t5, TI_ADDR_LIMIT($28)
129 addu t4, t0, 32
130 and t5, t4
131 bltz t5, bad_stack # -> sp is bad
133 /* Ok, copy the args from the luser stack to the kernel stack.
134 * t3 is the precomputed number of instruction bytes needed to
135 * load or store arguments 6-8.
136 */
138 la t1, 5f # load up to 3 arguments
139 subu t1, t3
140 1: lw t5, 16(t0) # argument #5 from usp
141 .set push
142 .set noreorder
143 .set nomacro
144 jr t1
145 addiu t1, 6f - 5f
147 2: lw t8, 28(t0) # argument #8 from usp
148 3: lw t7, 24(t0) # argument #7 from usp
149 4: lw t6, 20(t0) # argument #6 from usp
150 5: jr t1
151 sw t5, 16(sp) # argument #5 to ksp
153 sw t8, 28(sp) # argument #8 to ksp
154 sw t7, 24(sp) # argument #7 to ksp
155 sw t6, 20(sp) # argument #6 to ksp
156 6: j stack_done # go back
157 nop
158 .set pop
160 .section __ex_table,"a"
161 PTR 1b,bad_stack
162 PTR 2b,bad_stack
163 PTR 3b,bad_stack
164 PTR 4b,bad_stack
165 .previous
167 /*
168 * The stackpointer for a call with more than 4 arguments is bad.
169 * We probably should handle this case a bit more drastic.
170 */
171 bad_stack:
172 negu v0 # error
173 sw v0, PT_R0(sp)
174 sw v0, PT_R2(sp)
175 li t0, 1 # set error flag
176 sw t0, PT_R7(sp)
177 j o32_syscall_exit
179 /*
180 * The system call does not exist in this kernel
181 */
182 illegal_syscall:
183 li v0, ENOSYS # error
184 sw v0, PT_R2(sp)
185 li t0, 1 # set error flag
186 sw t0, PT_R7(sp)
187 j o32_syscall_exit
188 END(handle_sys)
190 LEAF(sys_syscall)
191 subu t0, a0, __NR_O32_Linux # check syscall number
192 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
193 beqz t0, einval # do not recurse
194 sll t1, t0, 3
195 beqz v0, einval
196 lw t2, sys_call_table(t1) # syscall routine
198 /* Some syscalls like execve get their arguments from struct pt_regs
199 and claim zero arguments in the syscall table. Thus we have to
200 assume the worst case and shuffle around all potential arguments.
201 If you want performance, don't use indirect syscalls. */
203 move a0, a1 # shift argument registers
204 move a1, a2
205 move a2, a3
206 lw a3, 16(sp)
207 lw t4, 20(sp)
208 lw t5, 24(sp)
209 lw t6, 28(sp)
210 sw t4, 16(sp)
211 sw t5, 20(sp)
212 sw t6, 24(sp)
213 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
214 sw a1, PT_R5(sp) # syscalls expect them there
215 sw a2, PT_R6(sp)
216 sw a3, PT_R7(sp)
217 sw a3, PT_R26(sp) # update a3 for syscall restarting
218 jr t2
219 /* Unreached */
221 einval: li v0, -ENOSYS
222 jr ra
223 END(sys_syscall)
225 .macro fifty ptr, nargs, from=1, to=50
226 sys \ptr \nargs
227 .if \to-\from
228 fifty \ptr,\nargs,"(\from+1)",\to
229 .endif
230 .endm
232 .macro mille ptr, nargs, from=1, to=20
233 fifty \ptr,\nargs
234 .if \to-\from
235 mille \ptr,\nargs,"(\from+1)",\to
236 .endif
237 .endm
239 .macro syscalltable
240 sys sys_syscall 8 /* 4000 */
241 sys sys_exit 1
242 sys sys_fork 0
243 sys sys_read 3
244 sys sys_write 3
245 sys sys_open 3 /* 4005 */
246 sys sys_close 1
247 sys sys_waitpid 3
248 sys sys_creat 2
249 sys sys_link 2
250 sys sys_unlink 1 /* 4010 */
251 sys sys_execve 0
252 sys sys_chdir 1
253 sys sys_time 1
254 sys sys_mknod 3
255 sys sys_chmod 2 /* 4015 */
256 sys sys_lchown 3
257 sys sys_ni_syscall 0
258 sys sys_ni_syscall 0 /* was sys_stat */
259 sys sys_lseek 3
260 sys sys_getpid 0 /* 4020 */
261 sys sys_mount 5
262 sys sys_oldumount 1
263 sys sys_setuid 1
264 sys sys_getuid 0
265 sys sys_stime 1 /* 4025 */
266 sys sys_ptrace 4
267 sys sys_alarm 1
268 sys sys_ni_syscall 0 /* was sys_fstat */
269 sys sys_pause 0
270 sys sys_utime 2 /* 4030 */
271 sys sys_ni_syscall 0
272 sys sys_ni_syscall 0
273 sys sys_access 2
274 sys sys_nice 1
275 sys sys_ni_syscall 0 /* 4035 */
276 sys sys_sync 0
277 sys sys_kill 2
278 sys sys_rename 2
279 sys sys_mkdir 2
280 sys sys_rmdir 1 /* 4040 */
281 sys sys_dup 1
282 sys sysm_pipe 0
283 sys sys_times 1
284 sys sys_ni_syscall 0
285 sys sys_brk 1 /* 4045 */
286 sys sys_setgid 1
287 sys sys_getgid 0
288 sys sys_ni_syscall 0 /* was signal(2) */
289 sys sys_geteuid 0
290 sys sys_getegid 0 /* 4050 */
291 sys sys_acct 1
292 sys sys_umount 2
293 sys sys_ni_syscall 0
294 sys sys_ioctl 3
295 sys sys_fcntl 3 /* 4055 */
296 sys sys_ni_syscall 2
297 sys sys_setpgid 2
298 sys sys_ni_syscall 0
299 sys sys_olduname 1
300 sys sys_umask 1 /* 4060 */
301 sys sys_chroot 1
302 sys sys_ustat 2
303 sys sys_dup2 2
304 sys sys_getppid 0
305 sys sys_getpgrp 0 /* 4065 */
306 sys sys_setsid 0
307 sys sys_sigaction 3
308 sys sys_sgetmask 0
309 sys sys_ssetmask 1
310 sys sys_setreuid 2 /* 4070 */
311 sys sys_setregid 2
312 sys sys_sigsuspend 0
313 sys sys_sigpending 1
314 sys sys_sethostname 2
315 sys sys_setrlimit 2 /* 4075 */
316 sys sys_getrlimit 2
317 sys sys_getrusage 2
318 sys sys_gettimeofday 2
319 sys sys_settimeofday 2
320 sys sys_getgroups 2 /* 4080 */
321 sys sys_setgroups 2
322 sys sys_ni_syscall 0 /* old_select */
323 sys sys_symlink 2
324 sys sys_ni_syscall 0 /* was sys_lstat */
325 sys sys_readlink 3 /* 4085 */
326 sys sys_uselib 1
327 sys sys_swapon 2
328 sys sys_reboot 3
329 sys sys_old_readdir 3
330 sys sys_mips_mmap 6 /* 4090 */
331 sys sys_munmap 2
332 sys sys_truncate 2
333 sys sys_ftruncate 2
334 sys sys_fchmod 2
335 sys sys_fchown 3 /* 4095 */
336 sys sys_getpriority 2
337 sys sys_setpriority 3
338 sys sys_ni_syscall 0
339 sys sys_statfs 2
340 sys sys_fstatfs 2 /* 4100 */
341 sys sys_ni_syscall 0 /* was ioperm(2) */
342 sys sys_socketcall 2
343 sys sys_syslog 3
344 sys sys_setitimer 3
345 sys sys_getitimer 2 /* 4105 */
346 sys sys_newstat 2
347 sys sys_newlstat 2
348 sys sys_newfstat 2
349 sys sys_uname 1
350 sys sys_ni_syscall 0 /* 4110 was iopl(2) */
351 sys sys_vhangup 0
352 sys sys_ni_syscall 0 /* was sys_idle() */
353 sys sys_ni_syscall 0 /* was sys_vm86 */
354 sys sys_wait4 4
355 sys sys_swapoff 1 /* 4115 */
356 sys sys_sysinfo 1
357 sys sys_ipc 6
358 sys sys_fsync 1
359 sys sys_sigreturn 0
360 sys sys_clone 0 /* 4120 */
361 sys sys_setdomainname 2
362 sys sys_newuname 1
363 sys sys_ni_syscall 0 /* sys_modify_ldt */
364 sys sys_adjtimex 1
365 sys sys_mprotect 3 /* 4125 */
366 sys sys_sigprocmask 3
367 sys sys_ni_syscall 0 /* was create_module */
368 sys sys_init_module 5
369 sys sys_delete_module 1
370 sys sys_ni_syscall 0 /* 4130 was get_kernel_syms */
371 sys sys_quotactl 4
372 sys sys_getpgid 1
373 sys sys_fchdir 1
374 sys sys_bdflush 2
375 sys sys_sysfs 3 /* 4135 */
376 sys sys_personality 1
377 sys sys_ni_syscall 0 /* for afs_syscall */
378 sys sys_setfsuid 1
379 sys sys_setfsgid 1
380 sys sys_llseek 5 /* 4140 */
381 sys sys_getdents 3
382 sys sys_select 5
383 sys sys_flock 2
384 sys sys_msync 3
385 sys sys_readv 3 /* 4145 */
386 sys sys_writev 3
387 sys sys_cacheflush 3
388 sys sys_cachectl 3
389 sys sys_sysmips 4
390 sys sys_ni_syscall 0 /* 4150 */
391 sys sys_getsid 1
392 sys sys_fdatasync 1
393 sys sys_sysctl 1
394 sys sys_mlock 2
395 sys sys_munlock 2 /* 4155 */
396 sys sys_mlockall 1
397 sys sys_munlockall 0
398 sys sys_sched_setparam 2
399 sys sys_sched_getparam 2
400 sys sys_sched_setscheduler 3 /* 4160 */
401 sys sys_sched_getscheduler 1
402 sys sys_sched_yield 0
403 sys sys_sched_get_priority_max 1
404 sys sys_sched_get_priority_min 1
405 sys sys_sched_rr_get_interval 2 /* 4165 */
406 sys sys_nanosleep, 2
407 sys sys_mremap, 5
408 sys sys_accept 3
409 sys sys_bind 3
410 sys sys_connect 3 /* 4170 */
411 sys sys_getpeername 3
412 sys sys_getsockname 3
413 sys sys_getsockopt 5
414 sys sys_listen 2
415 sys sys_recv 4 /* 4175 */
416 sys sys_recvfrom 6
417 sys sys_recvmsg 3
418 sys sys_send 4
419 sys sys_sendmsg 3
420 sys sys_sendto 6 /* 4180 */
421 sys sys_setsockopt 5
422 sys sys_shutdown 2
423 sys sys_socket 3
424 sys sys_socketpair 4
425 sys sys_setresuid 3 /* 4185 */
426 sys sys_getresuid 3
427 sys sys_ni_syscall 0 /* was sys_query_module */
428 sys sys_poll 3
429 sys sys_nfsservctl 3
430 sys sys_setresgid 3 /* 4190 */
431 sys sys_getresgid 3
432 sys sys_prctl 5
433 sys sys_rt_sigreturn 0
434 sys sys_rt_sigaction 4
435 sys sys_rt_sigprocmask 4 /* 4195 */
436 sys sys_rt_sigpending 2
437 sys sys_rt_sigtimedwait 4
438 sys sys_rt_sigqueueinfo 3
439 sys sys_rt_sigsuspend 0
440 sys sys_pread64 6 /* 4200 */
441 sys sys_pwrite64 6
442 sys sys_chown 3
443 sys sys_getcwd 2
444 sys sys_capget 2
445 sys sys_capset 2 /* 4205 */
446 sys sys_sigaltstack 0
447 sys sys_sendfile 4
448 sys sys_ni_syscall 0
449 sys sys_ni_syscall 0
450 sys sys_mips_mmap2 6 /* 4210 */
451 sys sys_truncate64 4
452 sys sys_ftruncate64 4
453 sys sys_stat64 2
454 sys sys_lstat64 2
455 sys sys_fstat64 2 /* 4215 */
456 sys sys_pivot_root 2
457 sys sys_mincore 3
458 sys sys_madvise 3
459 sys sys_getdents64 3
460 sys sys_fcntl64 3 /* 4220 */
461 sys sys_ni_syscall 0
462 sys sys_gettid 0
463 sys sys_readahead 5
464 sys sys_setxattr 5
465 sys sys_lsetxattr 5 /* 4225 */
466 sys sys_fsetxattr 5
467 sys sys_getxattr 4
468 sys sys_lgetxattr 4
469 sys sys_fgetxattr 4
470 sys sys_listxattr 3 /* 4230 */
471 sys sys_llistxattr 3
472 sys sys_flistxattr 3
473 sys sys_removexattr 2
474 sys sys_lremovexattr 2
475 sys sys_fremovexattr 2 /* 4235 */
476 sys sys_tkill 2
477 sys sys_sendfile64 5
478 sys sys_futex 6
479 #ifdef CONFIG_MIPS_MT_FPAFF
480 /*
481 * For FPU affinity scheduling on MIPS MT processors, we need to
482 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
483 * in kernel/sched.c. Considered only temporary we only support these
484 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
485 */
486 sys mipsmt_sys_sched_setaffinity 3
487 sys mipsmt_sys_sched_getaffinity 3
488 #else
489 sys sys_sched_setaffinity 3
490 sys sys_sched_getaffinity 3 /* 4240 */
491 #endif /* CONFIG_MIPS_MT_FPAFF */
492 sys sys_io_setup 2
493 sys sys_io_destroy 1
494 sys sys_io_getevents 5
495 sys sys_io_submit 3
496 sys sys_io_cancel 3 /* 4245 */
497 sys sys_exit_group 1
498 sys sys_lookup_dcookie 4
499 sys sys_epoll_create 1
500 sys sys_epoll_ctl 4
501 sys sys_epoll_wait 3 /* 4250 */
502 sys sys_remap_file_pages 5
503 sys sys_set_tid_address 1
504 sys sys_restart_syscall 0
505 sys sys_fadvise64_64 7
506 sys sys_statfs64 3 /* 4255 */
507 sys sys_fstatfs64 2
508 sys sys_timer_create 3
509 sys sys_timer_settime 4
510 sys sys_timer_gettime 2
511 sys sys_timer_getoverrun 1 /* 4260 */
512 sys sys_timer_delete 1
513 sys sys_clock_settime 2
514 sys sys_clock_gettime 2
515 sys sys_clock_getres 2
516 sys sys_clock_nanosleep 4 /* 4265 */
517 sys sys_tgkill 3
518 sys sys_utimes 2
519 sys sys_mbind 4
520 sys sys_ni_syscall 0 /* sys_get_mempolicy */
521 sys sys_ni_syscall 0 /* 4270 sys_set_mempolicy */
522 sys sys_mq_open 4
523 sys sys_mq_unlink 1
524 sys sys_mq_timedsend 5
525 sys sys_mq_timedreceive 5
526 sys sys_mq_notify 2 /* 4275 */
527 sys sys_mq_getsetattr 3
528 sys sys_ni_syscall 0 /* sys_vserver */
529 sys sys_waitid 5
530 sys sys_ni_syscall 0 /* available, was setaltroot */
531 sys sys_add_key 5 /* 4280 */
532 sys sys_request_key 4
533 sys sys_keyctl 5
534 sys sys_set_thread_area 1
535 sys sys_inotify_init 0
536 sys sys_inotify_add_watch 3 /* 4285 */
537 sys sys_inotify_rm_watch 2
538 sys sys_migrate_pages 4
539 sys sys_openat 4
540 sys sys_mkdirat 3
541 sys sys_mknodat 4 /* 4290 */
542 sys sys_fchownat 5
543 sys sys_futimesat 3
544 sys sys_fstatat64 4
545 sys sys_unlinkat 3
546 sys sys_renameat 4 /* 4295 */
547 sys sys_linkat 5
548 sys sys_symlinkat 3
549 sys sys_readlinkat 4
550 sys sys_fchmodat 3
551 sys sys_faccessat 3 /* 4300 */
552 sys sys_pselect6 6
553 sys sys_ppoll 5
554 sys sys_unshare 1
555 sys sys_splice 6
556 sys sys_sync_file_range 7 /* 4305 */
557 sys sys_tee 4
558 sys sys_vmsplice 4
559 sys sys_move_pages 6
560 sys sys_set_robust_list 2
561 sys sys_get_robust_list 3 /* 4310 */
562 sys sys_kexec_load 4
563 sys sys_getcpu 3
564 sys sys_epoll_pwait 6
565 sys sys_ioprio_set 3
566 sys sys_ioprio_get 2 /* 4315 */
567 sys sys_utimensat 4
568 sys sys_signalfd 3
569 sys sys_ni_syscall 0
570 sys sys_eventfd 1
571 sys sys_fallocate 6 /* 4320 */
572 sys sys_timerfd_create 2
573 sys sys_timerfd_gettime 2
574 sys sys_timerfd_settime 4
575 sys sys_signalfd4 4
576 sys sys_eventfd2 2 /* 4325 */
577 sys sys_epoll_create1 1
578 sys sys_dup3 3
579 sys sys_pipe2 2
580 sys sys_inotify_init1 1
581 sys sys_preadv 6 /* 4330 */
582 sys sys_pwritev 6
583 sys sys_rt_tgsigqueueinfo 4
584 sys sys_perf_event_open 5
585 sys sys_accept4 4
586 .endm
588 /* We pre-compute the number of _instruction_ bytes needed to
589 load or store the arguments 6-8. Negative values are ignored. */
591 .macro sys function, nargs
592 PTR \function
593 LONG (\nargs << 2) - (5 << 2)
594 .endm
596 .align 3
597 .type sys_call_table,@object
598 EXPORT(sys_call_table)
599 syscalltable
600 .size sys_call_table, . - sys_call_table