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
67 sw v0, PT_R0(sp) # set flag for syscall
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
108 sw v0, PT_R0(sp) # set flag for syscall
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.
175 li t0, 1 # set error flag
180 * The system call does not exist in this kernel
183 li v0, -ENOSYS # error
185 li t0, 1 # set error flag
190 LEAF(mips_atomic_set)
191 andi v0, a1, 3 # must be word aligned
192 bnez v0, bad_alignment
194 lw v1, TI_ADDR_LIMIT($28) # in legal address range?
200 #ifdef CONFIG_CPU_HAS_LLSC
201 /* Ok, this is the ll/sc case. World is sane :-) */
211 .section __ex_table,"a"
228 * At this point the page should be readable and writable unless
229 * there was no more memory available.
234 .section __ex_table,"a"
240 sw zero, PT_R7(sp) # success
241 sw v0, PT_R2(sp) # result
243 j o32_syscall_exit # continue like a normal syscall
245 no_mem: li v0, -ENOMEM
258 beq a0, MIPS_ATOMIC_SET, mips_atomic_set
263 subu t0, a0, __NR_O32_Linux # check syscall number
264 sltiu v0, t0, __NR_O32_Linux_syscalls + 1
268 lw t2, sys_call_table(t1) # syscall routine
270 li v1, 4000 - __NR_O32_Linux # index of sys_syscall
271 beq t0, v1, einval # do not recurse
273 /* Some syscalls like execve get their arguments from struct pt_regs
274 and claim zero arguments in the syscall table. Thus we have to
275 assume the worst case and shuffle around all potential arguments.
276 If you want performance, don't use indirect syscalls. */
278 move a0, a1 # shift argument registers
288 sw a0, PT_R4(sp) # .. and push back a0 - a3, some
289 sw a1, PT_R5(sp) # syscalls expect them there
292 sw a3, PT_R26(sp) # update a3 for syscall restarting
296 einval: li v0, -EINVAL
300 .macro fifty ptr, nargs, from=1, to=50
303 fifty \ptr,\nargs,"(\from+1)",\to
307 .macro mille ptr, nargs, from=1, to=20
310 mille \ptr,\nargs,"(\from+1)",\to
315 sys sys_syscall 8 /* 4000 */
320 sys sys_open 3 /* 4005 */
325 sys sys_unlink 1 /* 4010 */
330 sys sys_chmod 2 /* 4015 */
333 sys sys_ni_syscall 0 /* was sys_stat */
335 sys sys_getpid 0 /* 4020 */
340 sys sys_stime 1 /* 4025 */
343 sys sys_ni_syscall 0 /* was sys_fstat */
345 sys sys_utime 2 /* 4030 */
350 sys sys_ni_syscall 0 /* 4035 */
355 sys sys_rmdir 1 /* 4040 */
360 sys sys_brk 1 /* 4045 */
363 sys sys_ni_syscall 0 /* was signal(2) */
365 sys sys_getegid 0 /* 4050 */
370 sys sys_fcntl 3 /* 4055 */
375 sys sys_umask 1 /* 4060 */
380 sys sys_getpgrp 0 /* 4065 */
385 sys sys_setreuid 2 /* 4070 */
389 sys sys_sethostname 2
390 sys sys_setrlimit 2 /* 4075 */
393 sys sys_gettimeofday 2
394 sys sys_settimeofday 2
395 sys sys_getgroups 2 /* 4080 */
397 sys sys_ni_syscall 0 /* old_select */
399 sys sys_ni_syscall 0 /* was sys_lstat */
400 sys sys_readlink 3 /* 4085 */
405 sys old_mmap 6 /* 4090 */
410 sys sys_fchown 3 /* 4095 */
411 sys sys_getpriority 2
412 sys sys_setpriority 3
415 sys sys_fstatfs 2 /* 4100 */
416 sys sys_ni_syscall 0 /* was ioperm(2) */
420 sys sys_getitimer 2 /* 4105 */
425 sys sys_ni_syscall 0 /* 4110 was iopl(2) */
427 sys sys_ni_syscall 0 /* was sys_idle() */
428 sys sys_ni_syscall 0 /* was sys_vm86 */
430 sys sys_swapoff 1 /* 4115 */
435 sys sys_clone 0 /* 4120 */
436 sys sys_setdomainname 2
438 sys sys_ni_syscall 0 /* sys_modify_ldt */
440 sys sys_mprotect 3 /* 4125 */
441 sys sys_sigprocmask 3
442 sys sys_ni_syscall 0 /* was create_module */
443 sys sys_init_module 5
444 sys sys_delete_module 1
445 sys sys_ni_syscall 0 /* 4130 was get_kernel_syms */
450 sys sys_sysfs 3 /* 4135 */
451 sys sys_personality 1
452 sys sys_ni_syscall 0 /* for afs_syscall */
455 sys sys_llseek 5 /* 4140 */
460 sys sys_readv 3 /* 4145 */
465 sys sys_ni_syscall 0 /* 4150 */
470 sys sys_munlock 2 /* 4155 */
473 sys sys_sched_setparam 2
474 sys sys_sched_getparam 2
475 sys sys_sched_setscheduler 3 /* 4160 */
476 sys sys_sched_getscheduler 1
477 sys sys_sched_yield 0
478 sys sys_sched_get_priority_max 1
479 sys sys_sched_get_priority_min 1
480 sys sys_sched_rr_get_interval 2 /* 4165 */
485 sys sys_connect 3 /* 4170 */
486 sys sys_getpeername 3
487 sys sys_getsockname 3
490 sys sys_recv 4 /* 4175 */
495 sys sys_sendto 6 /* 4180 */
500 sys sys_setresuid 3 /* 4185 */
502 sys sys_ni_syscall 0 /* was sys_query_module */
505 sys sys_setresgid 3 /* 4190 */
508 sys sys_rt_sigreturn 0
509 sys sys_rt_sigaction 4
510 sys sys_rt_sigprocmask 4 /* 4195 */
511 sys sys_rt_sigpending 2
512 sys sys_rt_sigtimedwait 4
513 sys sys_rt_sigqueueinfo 3
514 sys sys_rt_sigsuspend 0
515 sys sys_pread64 6 /* 4200 */
520 sys sys_capset 2 /* 4205 */
521 sys sys_sigaltstack 0
525 sys sys_mmap2 6 /* 4210 */
527 sys sys_ftruncate64 4
530 sys sys_fstat64 2 /* 4215 */
535 sys sys_fcntl64 3 /* 4220 */
540 sys sys_lsetxattr 5 /* 4225 */
545 sys sys_listxattr 3 /* 4230 */
548 sys sys_removexattr 2
549 sys sys_lremovexattr 2
550 sys sys_fremovexattr 2 /* 4235 */
554 #ifdef CONFIG_MIPS_MT_FPAFF
556 * For FPU affinity scheduling on MIPS MT processors, we need to
557 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
558 * in kernel/sched.c. Considered only temporary we only support these
559 * hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
561 sys mipsmt_sys_sched_setaffinity 3
562 sys mipsmt_sys_sched_getaffinity 3
564 sys sys_sched_setaffinity 3
565 sys sys_sched_getaffinity 3 /* 4240 */
566 #endif /* CONFIG_MIPS_MT_FPAFF */
569 sys sys_io_getevents 5
571 sys sys_io_cancel 3 /* 4245 */
573 sys sys_lookup_dcookie 4
574 sys sys_epoll_create 1
576 sys sys_epoll_wait 3 /* 4250 */
577 sys sys_remap_file_pages 5
578 sys sys_set_tid_address 1
579 sys sys_restart_syscall 0
580 sys sys_fadvise64_64 7
581 sys sys_statfs64 3 /* 4255 */
583 sys sys_timer_create 3
584 sys sys_timer_settime 4
585 sys sys_timer_gettime 2
586 sys sys_timer_getoverrun 1 /* 4260 */
587 sys sys_timer_delete 1
588 sys sys_clock_settime 2
589 sys sys_clock_gettime 2
590 sys sys_clock_getres 2
591 sys sys_clock_nanosleep 4 /* 4265 */
595 sys sys_ni_syscall 0 /* sys_get_mempolicy */
596 sys sys_ni_syscall 0 /* 4270 sys_set_mempolicy */
599 sys sys_mq_timedsend 5
600 sys sys_mq_timedreceive 5
601 sys sys_mq_notify 2 /* 4275 */
602 sys sys_mq_getsetattr 3
603 sys sys_ni_syscall 0 /* sys_vserver */
605 sys sys_ni_syscall 0 /* available, was setaltroot */
606 sys sys_add_key 5 /* 4280 */
607 sys sys_request_key 4
609 sys sys_set_thread_area 1
610 sys sys_inotify_init 0
611 sys sys_inotify_add_watch 3 /* 4285 */
612 sys sys_inotify_rm_watch 2
613 sys sys_migrate_pages 4
616 sys sys_mknodat 4 /* 4290 */
621 sys sys_renameat 4 /* 4295 */
626 sys sys_faccessat 3 /* 4300 */
631 sys sys_sync_file_range 7 /* 4305 */
635 sys sys_set_robust_list 2
636 sys sys_get_robust_list 3 /* 4310 */
639 sys sys_epoll_pwait 6
641 sys sys_ioprio_get 2 /* 4315 */
646 sys sys_fallocate 6 /* 4320 */
647 sys sys_timerfd_create 2
648 sys sys_timerfd_gettime 2
649 sys sys_timerfd_settime 4
651 sys sys_eventfd2 2 /* 4325 */
652 sys sys_epoll_create1 1
655 sys sys_inotify_init1 1
658 /* We pre-compute the number of _instruction_ bytes needed to
659 load or store the arguments 6-8. Negative values are ignored. */
661 .macro sys function, nargs
663 LONG (\nargs << 2) - (5 << 2)
667 .type sys_call_table,@object
668 EXPORT(sys_call_table)
670 .size sys_call_table, . - sys_call_table