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
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
10 #include <linux/errno.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>
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
28 NESTED(handle_sys, PT_SIZE, sp)
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
41 beqz t0, illegal_syscall
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
54 lw t0, TI_FLAGS($28) # syscall tracing enabled?
55 li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
57 bnez t0, syscall_trace_entry # -> yes
59 jalr t2 # Do The Real Thing (TM)
61 li t0, -EMAXERRNO - 1 # error?
63 sw t0, PT_R7(sp) # set error flag
66 lw t1, PT_R2(sp) # syscall number
68 sw t1, PT_R0(sp) # save it for syscall restarting
69 1: sw v0, PT_R2(sp) # result
72 local_irq_disable # make sure need_resched and
73 # signals dont change between
75 lw a2, TI_FLAGS($28) # current->work
76 li t0, _TIF_ALLWORK_MASK
78 bnez t0, o32_syscall_exit_work
82 o32_syscall_exit_work:
83 j syscall_exit_work_partial
85 /* ------------------------------------------------------------------------ */
96 lw a0, PT_R4(sp) # Restore argument registers
102 li t0, -EMAXERRNO - 1 # error?
104 sw t0, PT_R7(sp) # set error flag
107 lw t1, PT_R2(sp) # syscall number
109 sw t1, PT_R0(sp) # save it for syscall restarting
110 1: sw v0, PT_R2(sp) # result
114 /* ------------------------------------------------------------------------ */
117 * More than four arguments. Try to deal with it by copying the
118 * stack arguments from the user stack to the kernel stack.
122 lw t0, PT_R29(sp) # get old user stack pointer
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.
128 lw t5, TI_ADDR_LIMIT($28)
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.
138 la t1, 5f # load up to 3 arguments
140 1: lw t5, 16(t0) # argument #5 from usp
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
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
160 .section __ex_table,"a"
168 * The stackpointer for a call with more than 4 arguments is bad.
169 * We probably should handle this case a bit more drastic.
174 li t0, 1 # set error flag
179 * The system call does not exist in this kernel
182 li v0, ENOSYS # error
184 li t0, 1 # set error flag
190 subu t0, a0, __NR_O32_Linux # check syscall number
191 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
192 beqz t0, einval # do not recurse
195 lw t2, sys_call_table(t1) # syscall routine
197 /* Some syscalls like execve get their arguments from struct pt_regs
198 and claim zero arguments in the syscall table. Thus we have to
199 assume the worst case and shuffle around all potential arguments.
200 If you want performance, don't use indirect syscalls. */
202 move a0, a1 # shift argument registers
212 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
213 sw a1, PT_R5(sp) # syscalls expect them there
216 sw a3, PT_R26(sp) # update a3 for syscall restarting
220 einval: li v0, -ENOSYS
224 .macro fifty ptr, nargs, from=1, to=50
227 fifty \ptr,\nargs,"(\from+1)",\to
231 .macro mille ptr, nargs, from=1, to=20
234 mille \ptr,\nargs,"(\from+1)",\to
239 sys sys_syscall 8 /* 4000 */
244 sys sys_open 3 /* 4005 */
249 sys sys_unlink 1 /* 4010 */
254 sys sys_chmod 2 /* 4015 */
257 sys sys_ni_syscall 0 /* was sys_stat */
259 sys sys_getpid 0 /* 4020 */
264 sys sys_stime 1 /* 4025 */
267 sys sys_ni_syscall 0 /* was sys_fstat */
269 sys sys_utime 2 /* 4030 */
274 sys sys_ni_syscall 0 /* 4035 */
279 sys sys_rmdir 1 /* 4040 */
284 sys sys_brk 1 /* 4045 */
287 sys sys_ni_syscall 0 /* was signal(2) */
289 sys sys_getegid 0 /* 4050 */
294 sys sys_fcntl 3 /* 4055 */
299 sys sys_umask 1 /* 4060 */
304 sys sys_getpgrp 0 /* 4065 */
309 sys sys_setreuid 2 /* 4070 */
313 sys sys_sethostname 2
314 sys sys_setrlimit 2 /* 4075 */
317 sys sys_gettimeofday 2
318 sys sys_settimeofday 2
319 sys sys_getgroups 2 /* 4080 */
321 sys sys_ni_syscall 0 /* old_select */
323 sys sys_ni_syscall 0 /* was sys_lstat */
324 sys sys_readlink 3 /* 4085 */
328 sys sys_old_readdir 3
329 sys sys_mips_mmap 6 /* 4090 */
334 sys sys_fchown 3 /* 4095 */
335 sys sys_getpriority 2
336 sys sys_setpriority 3
339 sys sys_fstatfs 2 /* 4100 */
340 sys sys_ni_syscall 0 /* was ioperm(2) */
344 sys sys_getitimer 2 /* 4105 */
349 sys sys_ni_syscall 0 /* 4110 was iopl(2) */
351 sys sys_ni_syscall 0 /* was sys_idle() */
352 sys sys_ni_syscall 0 /* was sys_vm86 */
354 sys sys_swapoff 1 /* 4115 */
359 sys sys_clone 0 /* 4120 */
360 sys sys_setdomainname 2
362 sys sys_ni_syscall 0 /* sys_modify_ldt */
364 sys sys_mprotect 3 /* 4125 */
365 sys sys_sigprocmask 3
366 sys sys_ni_syscall 0 /* was create_module */
367 sys sys_init_module 5
368 sys sys_delete_module 1
369 sys sys_ni_syscall 0 /* 4130 was get_kernel_syms */
374 sys sys_sysfs 3 /* 4135 */
375 sys sys_personality 1
376 sys sys_ni_syscall 0 /* for afs_syscall */
379 sys sys_llseek 5 /* 4140 */
384 sys sys_readv 3 /* 4145 */
389 sys sys_ni_syscall 0 /* 4150 */
394 sys sys_munlock 2 /* 4155 */
397 sys sys_sched_setparam 2
398 sys sys_sched_getparam 2
399 sys sys_sched_setscheduler 3 /* 4160 */
400 sys sys_sched_getscheduler 1
401 sys sys_sched_yield 0
402 sys sys_sched_get_priority_max 1
403 sys sys_sched_get_priority_min 1
404 sys sys_sched_rr_get_interval 2 /* 4165 */
409 sys sys_connect 3 /* 4170 */
410 sys sys_getpeername 3
411 sys sys_getsockname 3
414 sys sys_recv 4 /* 4175 */
419 sys sys_sendto 6 /* 4180 */
424 sys sys_setresuid 3 /* 4185 */
426 sys sys_ni_syscall 0 /* was sys_query_module */
429 sys sys_setresgid 3 /* 4190 */
432 sys sys_rt_sigreturn 0
433 sys sys_rt_sigaction 4
434 sys sys_rt_sigprocmask 4 /* 4195 */
435 sys sys_rt_sigpending 2
436 sys sys_rt_sigtimedwait 4
437 sys sys_rt_sigqueueinfo 3
438 sys sys_rt_sigsuspend 0
439 sys sys_pread64 6 /* 4200 */
444 sys sys_capset 2 /* 4205 */
445 sys sys_sigaltstack 0
449 sys sys_mips_mmap2 6 /* 4210 */
451 sys sys_ftruncate64 4
454 sys sys_fstat64 2 /* 4215 */
459 sys sys_fcntl64 3 /* 4220 */
464 sys sys_lsetxattr 5 /* 4225 */
469 sys sys_listxattr 3 /* 4230 */
472 sys sys_removexattr 2
473 sys sys_lremovexattr 2
474 sys sys_fremovexattr 2 /* 4235 */
478 #ifdef CONFIG_MIPS_MT_FPAFF
480 * For FPU affinity scheduling on MIPS MT processors, we need to
481 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
482 * in kernel/sched.c. Considered only temporary we only support these
483 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
485 sys mipsmt_sys_sched_setaffinity 3
486 sys mipsmt_sys_sched_getaffinity 3
488 sys sys_sched_setaffinity 3
489 sys sys_sched_getaffinity 3 /* 4240 */
490 #endif /* CONFIG_MIPS_MT_FPAFF */
493 sys sys_io_getevents 5
495 sys sys_io_cancel 3 /* 4245 */
497 sys sys_lookup_dcookie 4
498 sys sys_epoll_create 1
500 sys sys_epoll_wait 3 /* 4250 */
501 sys sys_remap_file_pages 5
502 sys sys_set_tid_address 1
503 sys sys_restart_syscall 0
504 sys sys_fadvise64_64 7
505 sys sys_statfs64 3 /* 4255 */
507 sys sys_timer_create 3
508 sys sys_timer_settime 4
509 sys sys_timer_gettime 2
510 sys sys_timer_getoverrun 1 /* 4260 */
511 sys sys_timer_delete 1
512 sys sys_clock_settime 2
513 sys sys_clock_gettime 2
514 sys sys_clock_getres 2
515 sys sys_clock_nanosleep 4 /* 4265 */
519 sys sys_ni_syscall 0 /* sys_get_mempolicy */
520 sys sys_ni_syscall 0 /* 4270 sys_set_mempolicy */
523 sys sys_mq_timedsend 5
524 sys sys_mq_timedreceive 5
525 sys sys_mq_notify 2 /* 4275 */
526 sys sys_mq_getsetattr 3
527 sys sys_ni_syscall 0 /* sys_vserver */
529 sys sys_ni_syscall 0 /* available, was setaltroot */
530 sys sys_add_key 5 /* 4280 */
531 sys sys_request_key 4
533 sys sys_set_thread_area 1
534 sys sys_inotify_init 0
535 sys sys_inotify_add_watch 3 /* 4285 */
536 sys sys_inotify_rm_watch 2
537 sys sys_migrate_pages 4
540 sys sys_mknodat 4 /* 4290 */
545 sys sys_renameat 4 /* 4295 */
550 sys sys_faccessat 3 /* 4300 */
555 sys sys_sync_file_range 7 /* 4305 */
559 sys sys_set_robust_list 2
560 sys sys_get_robust_list 3 /* 4310 */
563 sys sys_epoll_pwait 6
565 sys sys_ioprio_get 2 /* 4315 */
568 sys sys_ni_syscall 0 /* was timerfd */
570 sys sys_fallocate 6 /* 4320 */
571 sys sys_timerfd_create 2
572 sys sys_timerfd_gettime 2
573 sys sys_timerfd_settime 4
575 sys sys_eventfd2 2 /* 4325 */
576 sys sys_epoll_create1 1
579 sys sys_inotify_init1 1
580 sys sys_preadv 6 /* 4330 */
582 sys sys_rt_tgsigqueueinfo 4
583 sys sys_perf_event_open 5
585 sys sys_recvmmsg 5 /* 4335 */
586 sys sys_fanotify_init 2
587 sys sys_fanotify_mark 6
589 sys sys_name_to_handle_at 5
590 sys sys_open_by_handle_at 3 /* 4340 */
591 sys sys_clock_adjtime 2
595 /* We pre-compute the number of _instruction_ bytes needed to
596 load or store the arguments 6-8. Negative values are ignored. */
598 .macro sys function, nargs
600 LONG (\nargs << 2) - (5 << 2)
604 .type sys_call_table,@object
605 EXPORT(sys_call_table)
607 .size sys_call_table, . - sys_call_table