[deliverable/linux.git] / arch / mips / kernel / scall32-o32.S

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
 * Copyright (C) 2001 MIPS Technologies, Inc.
 * Copyright (C) 2004 Thiemo Seufer
 * Copyright (C) 2014 Imagination Technologies Ltd.
 */
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/irqflags.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/isadep.h>
#include <asm/sysmips.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/war.h>
#include <asm/asm-offsets.h>

/* Highest syscall used of any syscall flavour */
#define MAX_SYSCALL_NO	__NR_O32_Linux + __NR_O32_Linux_syscalls

	.align	5
NESTED(handle_sys, PT_SIZE, sp)
	.set	noat
	SAVE_SOME
	TRACE_IRQS_ON_RELOAD
	STI
	.set	at

	lw	t1, PT_EPC(sp)		# skip syscall on return

	subu	v0, v0, __NR_O32_Linux	# check syscall number
	sltiu	t0, v0, __NR_O32_Linux_syscalls + 1
	addiu	t1, 4			# skip to next instruction
	sw	t1, PT_EPC(sp)
	beqz	t0, illegal_syscall

	sll	t0, v0, 2
	la	t1, sys_call_table
	addu	t1, t0
	lw	t2, (t1)		# syscall routine
	beqz	t2, illegal_syscall

	sw	a3, PT_R26(sp)		# save a3 for syscall restarting

	/*
	 * More than four arguments.  Try to deal with it by copying the
	 * stack arguments from the user stack to the kernel stack.
	 * This Sucks (TM).
	 */
	lw	t0, PT_R29(sp)		# get old user stack pointer

	/*
	 * We intentionally keep the kernel stack a little below the top of
	 * userspace so we don't have to do a slower byte accurate check here.
	 */
	lw	t5, TI_ADDR_LIMIT($28)
	addu	t4, t0, 32
	and	t5, t4
	bltz	t5, bad_stack		# -> sp is bad

	/*
	 * Ok, copy the args from the luser stack to the kernel stack.
	 */

	.set    push
	.set    noreorder
	.set	nomacro

1:	user_lw(t5, 16(t0))		# argument #5 from usp
4:	user_lw(t6, 20(t0))		# argument #6 from usp
3:	user_lw(t7, 24(t0))		# argument #7 from usp
2:	user_lw(t8, 28(t0))		# argument #8 from usp

	sw	t5, 16(sp)		# argument #5 to ksp
	sw	t6, 20(sp)		# argument #6 to ksp
	sw	t7, 24(sp)		# argument #7 to ksp
	sw	t8, 28(sp)		# argument #8 to ksp
	.set	pop

	.section __ex_table,"a"
	PTR	1b,bad_stack
	PTR	2b,bad_stack
	PTR	3b,bad_stack
	PTR	4b,bad_stack
	.previous

	lw	t0, TI_FLAGS($28)	# syscall tracing enabled?
	li	t1, _TIF_WORK_SYSCALL_ENTRY
	and	t0, t1
	bnez	t0, syscall_trace_entry # -> yes

	jalr	t2			# Do The Real Thing (TM)

	li	t0, -EMAXERRNO - 1	# error?
	sltu	t0, t0, v0
	sw	t0, PT_R7(sp)		# set error flag
	beqz	t0, 1f

	lw	t1, PT_R2(sp)		# syscall number
	negu	v0			# error
	sw	t1, PT_R0(sp)		# save it for syscall restarting
1:	sw	v0, PT_R2(sp)		# result

o32_syscall_exit:
	j	syscall_exit_partial

/* ------------------------------------------------------------------------ */

syscall_trace_entry:
	SAVE_STATIC
	move	s0, t2
	move	a0, sp

	/*
	 * syscall number is in v0 unless we called syscall(__NR_###)
	 * where the real syscall number is in a0
	 */
	addiu	a1, v0,  __NR_O32_Linux
	bnez	v0, 1f /* __NR_syscall at offset 0 */
	lw	a1, PT_R4(sp)

1:	jal	syscall_trace_enter

	bltz	v0, 2f			# seccomp failed? Skip syscall

	move	t0, s0
	RESTORE_STATIC
	lw	a0, PT_R4(sp)		# Restore argument registers
	lw	a1, PT_R5(sp)
	lw	a2, PT_R6(sp)
	lw	a3, PT_R7(sp)
	jalr	t0

	li	t0, -EMAXERRNO - 1	# error?
	sltu	t0, t0, v0
	sw	t0, PT_R7(sp)		# set error flag
	beqz	t0, 1f

	lw	t1, PT_R2(sp)		# syscall number
	negu	v0			# error
	sw	t1, PT_R0(sp)		# save it for syscall restarting
1:	sw	v0, PT_R2(sp)		# result

2:	j	syscall_exit

/* ------------------------------------------------------------------------ */

	/*
	 * The stackpointer for a call with more than 4 arguments is bad.
	 * We probably should handle this case a bit more drastic.
	 */
bad_stack:
	li	v0, EFAULT
	sw	v0, PT_R2(sp)
	li	t0, 1				# set error flag
	sw	t0, PT_R7(sp)
	j	o32_syscall_exit

	/*
	 * The system call does not exist in this kernel
	 */
illegal_syscall:
	li	v0, ENOSYS			# error
	sw	v0, PT_R2(sp)
	li	t0, 1				# set error flag
	sw	t0, PT_R7(sp)
	j	o32_syscall_exit
	END(handle_sys)

	LEAF(sys_syscall)
	subu	t0, a0, __NR_O32_Linux	# check syscall number
	sltiu	v0, t0, __NR_O32_Linux_syscalls + 1
	beqz	t0, einval		# do not recurse
	sll	t1, t0, 2
	beqz	v0, einval
	lw	t2, sys_call_table(t1)		# syscall routine
	sw	a0, PT_R2(sp)			# call routine directly on restart

	/* Some syscalls like execve get their arguments from struct pt_regs
	   and claim zero arguments in the syscall table. Thus we have to
	   assume the worst case and shuffle around all potential arguments.
	   If you want performance, don't use indirect syscalls. */

	move	a0, a1				# shift argument registers
	move	a1, a2
	move	a2, a3
	lw	a3, 16(sp)
	lw	t4, 20(sp)
	lw	t5, 24(sp)
	lw	t6, 28(sp)
	sw	t4, 16(sp)
	sw	t5, 20(sp)
	sw	t6, 24(sp)
	sw	a0, PT_R4(sp)			# .. and push back a0 - a3, some
	sw	a1, PT_R5(sp)			# syscalls expect them there
	sw	a2, PT_R6(sp)
	sw	a3, PT_R7(sp)
	sw	a3, PT_R26(sp)			# update a3 for syscall restarting
	jr	t2
	/* Unreached */

einval: li	v0, -ENOSYS
	jr	ra
	END(sys_syscall)

	.align	2
	.type	sys_call_table, @object
EXPORT(sys_call_table)
	PTR	sys_syscall			/* 4000 */
	PTR	sys_exit
	PTR	__sys_fork
	PTR	sys_read
	PTR	sys_write
	PTR	sys_open			/* 4005 */
	PTR	sys_close
	PTR	sys_waitpid
	PTR	sys_creat
	PTR	sys_link
	PTR	sys_unlink			/* 4010 */
	PTR	sys_execve
	PTR	sys_chdir
	PTR	sys_time
	PTR	sys_mknod
	PTR	sys_chmod			/* 4015 */
	PTR	sys_lchown
	PTR	sys_ni_syscall
	PTR	sys_ni_syscall			/* was sys_stat */
	PTR	sys_lseek
	PTR	sys_getpid			/* 4020 */
	PTR	sys_mount
	PTR	sys_oldumount
	PTR	sys_setuid
	PTR	sys_getuid
	PTR	sys_stime			/* 4025 */
	PTR	sys_ptrace
	PTR	sys_alarm
	PTR	sys_ni_syscall			/* was sys_fstat */
	PTR	sys_pause
	PTR	sys_utime			/* 4030 */
	PTR	sys_ni_syscall
	PTR	sys_ni_syscall
	PTR	sys_access
	PTR	sys_nice
	PTR	sys_ni_syscall			/* 4035 */
	PTR	sys_sync
	PTR	sys_kill
	PTR	sys_rename
	PTR	sys_mkdir
	PTR	sys_rmdir			/* 4040 */
	PTR	sys_dup
	PTR	sysm_pipe
	PTR	sys_times
	PTR	sys_ni_syscall
	PTR	sys_brk				/* 4045 */
	PTR	sys_setgid
	PTR	sys_getgid
	PTR	sys_ni_syscall			/* was signal(2) */
	PTR	sys_geteuid
	PTR	sys_getegid			/* 4050 */
	PTR	sys_acct
	PTR	sys_umount
	PTR	sys_ni_syscall
	PTR	sys_ioctl
	PTR	sys_fcntl			/* 4055 */
	PTR	sys_ni_syscall
	PTR	sys_setpgid
	PTR	sys_ni_syscall
	PTR	sys_olduname
	PTR	sys_umask			/* 4060 */
	PTR	sys_chroot
	PTR	sys_ustat
	PTR	sys_dup2
	PTR	sys_getppid
	PTR	sys_getpgrp			/* 4065 */
	PTR	sys_setsid
	PTR	sys_sigaction
	PTR	sys_sgetmask
	PTR	sys_ssetmask
	PTR	sys_setreuid			/* 4070 */
	PTR	sys_setregid
	PTR	sys_sigsuspend
	PTR	sys_sigpending
	PTR	sys_sethostname
	PTR	sys_setrlimit			/* 4075 */
	PTR	sys_getrlimit
	PTR	sys_getrusage
	PTR	sys_gettimeofday
	PTR	sys_settimeofday
	PTR	sys_getgroups			/* 4080 */
	PTR	sys_setgroups
	PTR	sys_ni_syscall			/* old_select */
	PTR	sys_symlink
	PTR	sys_ni_syscall			/* was sys_lstat */
	PTR	sys_readlink			/* 4085 */
	PTR	sys_uselib
	PTR	sys_swapon
	PTR	sys_reboot
	PTR	sys_old_readdir
	PTR	sys_mips_mmap			/* 4090 */
	PTR	sys_munmap
	PTR	sys_truncate
	PTR	sys_ftruncate
	PTR	sys_fchmod
	PTR	sys_fchown			/* 4095 */
	PTR	sys_getpriority
	PTR	sys_setpriority
	PTR	sys_ni_syscall
	PTR	sys_statfs
	PTR	sys_fstatfs			/* 4100 */
	PTR	sys_ni_syscall			/* was ioperm(2) */
	PTR	sys_socketcall
	PTR	sys_syslog
	PTR	sys_setitimer
	PTR	sys_getitimer			/* 4105 */
	PTR	sys_newstat
	PTR	sys_newlstat
	PTR	sys_newfstat
	PTR	sys_uname
	PTR	sys_ni_syscall			/* 4110 was iopl(2) */
	PTR	sys_vhangup
	PTR	sys_ni_syscall			/* was sys_idle() */
	PTR	sys_ni_syscall			/* was sys_vm86 */
	PTR	sys_wait4
	PTR	sys_swapoff			/* 4115 */
	PTR	sys_sysinfo
	PTR	sys_ipc
	PTR	sys_fsync
	PTR	sys_sigreturn
	PTR	__sys_clone			/* 4120 */
	PTR	sys_setdomainname
	PTR	sys_newuname
	PTR	sys_ni_syscall			/* sys_modify_ldt */
	PTR	sys_adjtimex
	PTR	sys_mprotect			/* 4125 */
	PTR	sys_sigprocmask
	PTR	sys_ni_syscall			/* was create_module */
	PTR	sys_init_module
	PTR	sys_delete_module
	PTR	sys_ni_syscall			/* 4130 was get_kernel_syms */
	PTR	sys_quotactl
	PTR	sys_getpgid
	PTR	sys_fchdir
	PTR	sys_bdflush
	PTR	sys_sysfs			/* 4135 */
	PTR	sys_personality
	PTR	sys_ni_syscall			/* for afs_syscall */
	PTR	sys_setfsuid
	PTR	sys_setfsgid
	PTR	sys_llseek			/* 4140 */
	PTR	sys_getdents
	PTR	sys_select
	PTR	sys_flock
	PTR	sys_msync
	PTR	sys_readv			/* 4145 */
	PTR	sys_writev
	PTR	sys_cacheflush
	PTR	sys_cachectl
	PTR	sys_sysmips
	PTR	sys_ni_syscall			/* 4150 */
	PTR	sys_getsid
	PTR	sys_fdatasync
	PTR	sys_sysctl
	PTR	sys_mlock
	PTR	sys_munlock			/* 4155 */
	PTR	sys_mlockall
	PTR	sys_munlockall
	PTR	sys_sched_setparam
	PTR	sys_sched_getparam
	PTR	sys_sched_setscheduler		/* 4160 */
	PTR	sys_sched_getscheduler
	PTR	sys_sched_yield
	PTR	sys_sched_get_priority_max
	PTR	sys_sched_get_priority_min
	PTR	sys_sched_rr_get_interval	/* 4165 */
	PTR	sys_nanosleep
	PTR	sys_mremap
	PTR	sys_accept
	PTR	sys_bind
	PTR	sys_connect			/* 4170 */
	PTR	sys_getpeername
	PTR	sys_getsockname
	PTR	sys_getsockopt
	PTR	sys_listen
	PTR	sys_recv			/* 4175 */
	PTR	sys_recvfrom
	PTR	sys_recvmsg
	PTR	sys_send
	PTR	sys_sendmsg
	PTR	sys_sendto			/* 4180 */
	PTR	sys_setsockopt
	PTR	sys_shutdown
	PTR	sys_socket
	PTR	sys_socketpair
	PTR	sys_setresuid			/* 4185 */
	PTR	sys_getresuid
	PTR	sys_ni_syscall			/* was sys_query_module */
	PTR	sys_poll
	PTR	sys_ni_syscall			/* was nfsservctl */
	PTR	sys_setresgid			/* 4190 */
	PTR	sys_getresgid
	PTR	sys_prctl
	PTR	sys_rt_sigreturn
	PTR	sys_rt_sigaction
	PTR	sys_rt_sigprocmask		/* 4195 */
	PTR	sys_rt_sigpending
	PTR	sys_rt_sigtimedwait
	PTR	sys_rt_sigqueueinfo
	PTR	sys_rt_sigsuspend
	PTR	sys_pread64			/* 4200 */
	PTR	sys_pwrite64
	PTR	sys_chown
	PTR	sys_getcwd
	PTR	sys_capget
	PTR	sys_capset			/* 4205 */
	PTR	sys_sigaltstack
	PTR	sys_sendfile
	PTR	sys_ni_syscall
	PTR	sys_ni_syscall
	PTR	sys_mips_mmap2			/* 4210 */
	PTR	sys_truncate64
	PTR	sys_ftruncate64
	PTR	sys_stat64
	PTR	sys_lstat64
	PTR	sys_fstat64			/* 4215 */
	PTR	sys_pivot_root
	PTR	sys_mincore
	PTR	sys_madvise
	PTR	sys_getdents64
	PTR	sys_fcntl64			/* 4220 */
	PTR	sys_ni_syscall
	PTR	sys_gettid
	PTR	sys_readahead
	PTR	sys_setxattr
	PTR	sys_lsetxattr			/* 4225 */
	PTR	sys_fsetxattr
	PTR	sys_getxattr
	PTR	sys_lgetxattr
	PTR	sys_fgetxattr
	PTR	sys_listxattr			/* 4230 */
	PTR	sys_llistxattr
	PTR	sys_flistxattr
	PTR	sys_removexattr
	PTR	sys_lremovexattr
	PTR	sys_fremovexattr		/* 4235 */
	PTR	sys_tkill
	PTR	sys_sendfile64
	PTR	sys_futex
#ifdef CONFIG_MIPS_MT_FPAFF
	/*
	 * For FPU affinity scheduling on MIPS MT processors, we need to
	 * intercept sys_sched_xxxaffinity() calls until we get a proper hook
	 * in kernel/sched/core.c.  Considered only temporary we only support
	 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor
	 * atm.
	 */
	PTR	mipsmt_sys_sched_setaffinity
	PTR	mipsmt_sys_sched_getaffinity
#else
	PTR	sys_sched_setaffinity
	PTR	sys_sched_getaffinity		/* 4240 */
#endif /* CONFIG_MIPS_MT_FPAFF */
	PTR	sys_io_setup
	PTR	sys_io_destroy
	PTR	sys_io_getevents
	PTR	sys_io_submit
	PTR	sys_io_cancel			/* 4245 */
	PTR	sys_exit_group
	PTR	sys_lookup_dcookie
	PTR	sys_epoll_create
	PTR	sys_epoll_ctl
	PTR	sys_epoll_wait			/* 4250 */
	PTR	sys_remap_file_pages
	PTR	sys_set_tid_address
	PTR	sys_restart_syscall
	PTR	sys_fadvise64_64
	PTR	sys_statfs64			/* 4255 */
	PTR	sys_fstatfs64
	PTR	sys_timer_create
	PTR	sys_timer_settime
	PTR	sys_timer_gettime
	PTR	sys_timer_getoverrun		/* 4260 */
	PTR	sys_timer_delete
	PTR	sys_clock_settime
	PTR	sys_clock_gettime
	PTR	sys_clock_getres
	PTR	sys_clock_nanosleep		/* 4265 */
	PTR	sys_tgkill
	PTR	sys_utimes
	PTR	sys_mbind
	PTR	sys_get_mempolicy
	PTR	sys_set_mempolicy		/* 4270 */
	PTR	sys_mq_open
	PTR	sys_mq_unlink
	PTR	sys_mq_timedsend
	PTR	sys_mq_timedreceive
	PTR	sys_mq_notify			/* 4275 */
	PTR	sys_mq_getsetattr
	PTR	sys_ni_syscall			/* sys_vserver */
	PTR	sys_waitid
	PTR	sys_ni_syscall			/* available, was setaltroot */
	PTR	sys_add_key			/* 4280 */
	PTR	sys_request_key
	PTR	sys_keyctl
	PTR	sys_set_thread_area
	PTR	sys_inotify_init
	PTR	sys_inotify_add_watch		/* 4285 */
	PTR	sys_inotify_rm_watch
	PTR	sys_migrate_pages
	PTR	sys_openat
	PTR	sys_mkdirat
	PTR	sys_mknodat			/* 4290 */
	PTR	sys_fchownat
	PTR	sys_futimesat
	PTR	sys_fstatat64
	PTR	sys_unlinkat
	PTR	sys_renameat			/* 4295 */
	PTR	sys_linkat
	PTR	sys_symlinkat
	PTR	sys_readlinkat
	PTR	sys_fchmodat
	PTR	sys_faccessat			/* 4300 */
	PTR	sys_pselect6
	PTR	sys_ppoll
	PTR	sys_unshare
	PTR	sys_splice
	PTR	sys_sync_file_range		/* 4305 */
	PTR	sys_tee
	PTR	sys_vmsplice
	PTR	sys_move_pages
	PTR	sys_set_robust_list
	PTR	sys_get_robust_list		/* 4310 */
	PTR	sys_kexec_load
	PTR	sys_getcpu
	PTR	sys_epoll_pwait
	PTR	sys_ioprio_set
	PTR	sys_ioprio_get			/* 4315 */
	PTR	sys_utimensat
	PTR	sys_signalfd
	PTR	sys_ni_syscall			/* was timerfd */
	PTR	sys_eventfd
	PTR	sys_fallocate			/* 4320 */
	PTR	sys_timerfd_create
	PTR	sys_timerfd_gettime
	PTR	sys_timerfd_settime
	PTR	sys_signalfd4
	PTR	sys_eventfd2			/* 4325 */
	PTR	sys_epoll_create1
	PTR	sys_dup3
	PTR	sys_pipe2
	PTR	sys_inotify_init1
	PTR	sys_preadv			/* 4330 */
	PTR	sys_pwritev
	PTR	sys_rt_tgsigqueueinfo
	PTR	sys_perf_event_open
	PTR	sys_accept4
	PTR	sys_recvmmsg			/* 4335 */
	PTR	sys_fanotify_init
	PTR	sys_fanotify_mark
	PTR	sys_prlimit64
	PTR	sys_name_to_handle_at
	PTR	sys_open_by_handle_at		/* 4340 */
	PTR	sys_clock_adjtime
	PTR	sys_syncfs
	PTR	sys_sendmmsg
	PTR	sys_setns
	PTR	sys_process_vm_readv		/* 4345 */
	PTR	sys_process_vm_writev
	PTR	sys_kcmp
	PTR	sys_finit_module
	PTR	sys_sched_setattr
	PTR	sys_sched_getattr		/* 4350 */
	PTR	sys_renameat2
	PTR	sys_seccomp
	PTR	sys_getrandom
	PTR	sys_memfd_create
	PTR	sys_bpf				/* 4355 */
	PTR	sys_execveat
Commit	Line	Data
1da177e4 LT	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	*
192ef366	6	* Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
1da177e4 LT	7	* Copyright (C) 2001 MIPS Technologies, Inc.
1da177e4 LT	8	* Copyright (C) 2004 Thiemo Seufer
86bdb277	9	* Copyright (C) 2014 Imagination Technologies Ltd.
1da177e4	10	*/
1da177e4 LT	11	#include <linux/errno.h>
	12	#include <asm/asm.h>
	13	#include <asm/asmmacro.h>
192ef366	14	#include <asm/irqflags.h>
1da177e4 LT	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>
048eb582	23	#include <asm/asm-offsets.h>
1da177e4 LT	24
	25	/* Highest syscall used of any syscall flavour */
	26	#define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
	27
70342287	28	.align 5
1da177e4 LT	29	NESTED(handle_sys, PT_SIZE, sp)
	30	.set noat
	31	SAVE_SOME
eae6c0da	32	TRACE_IRQS_ON_RELOAD
1da177e4 LT	33	STI
	34	.set at
	35
	36	lw t1, PT_EPC(sp) # skip syscall on return
	37
1da177e4 LT	38	subu v0, v0, __NR_O32_Linux # check syscall number
1da177e4 LT	39	sltiu t0, v0, __NR_O32_Linux_syscalls + 1
1da177e4 LT	40	addiu t1, 4 # skip to next instruction
	41	sw t1, PT_EPC(sp)
	42	beqz t0, illegal_syscall
	43
46e12c07	44	sll t0, v0, 2
1da177e4 LT	45	la t1, sys_call_table
	46	addu t1, t0
	47	lw t2, (t1) # syscall routine
1da177e4 LT	48	beqz t2, illegal_syscall
	49
	50	sw a3, PT_R26(sp) # save a3 for syscall restarting
1da177e4	51
46e12c07 RB	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
	58
	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
	67
	68	/*
	69	* Ok, copy the args from the luser stack to the kernel stack.
46e12c07 RB	70	*/
	71
	72	.set push
	73	.set noreorder
	74	.set nomacro
	75
86bdb277 MC	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
46e12c07 RB	80
	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
	86
	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
	93
1da177e4	94	lw t0, TI_FLAGS($28) # syscall tracing enabled?
e7f3b48a	95	li t1, _TIF_WORK_SYSCALL_ENTRY
1da177e4	96	and t0, t1
70342287	97	bnez t0, syscall_trace_entry # -> yes
1da177e4 LT	98
	99	jalr t2 # Do The Real Thing (TM)
	100
	101	li t0, -EMAXERRNO - 1 # error?
	102	sltu t0, t0, v0
	103	sw t0, PT_R7(sp) # set error flag
	104	beqz t0, 1f
	105
8f5a00eb	106	lw t1, PT_R2(sp) # syscall number
1da177e4	107	negu v0 # error
8f5a00eb	108	sw t1, PT_R0(sp) # save it for syscall restarting
1da177e4 LT	109	1: sw v0, PT_R2(sp) # result
	110
	111	o32_syscall_exit:
02f884ed	112	j syscall_exit_partial
1da177e4 LT	113
	114	/* ------------------------------------------------------------------------ */
	115
	116	syscall_trace_entry:
	117	SAVE_STATIC
	118	move s0, t2
	119	move a0, sp
4c21b8fd MC	120
	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)
	128
	129	1: jal syscall_trace_enter
1da177e4	130
9d37c405 MC	131	bltz v0, 2f # seccomp failed? Skip syscall
9d37c405 MC	132
04a7052c RB	133	move t0, s0
04a7052c RB	134	RESTORE_STATIC
1da177e4 LT	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)
04a7052c	139	jalr t0
1da177e4 LT	140
	141	li t0, -EMAXERRNO - 1 # error?
	142	sltu t0, t0, v0
	143	sw t0, PT_R7(sp) # set error flag
	144	beqz t0, 1f
	145
8f5a00eb	146	lw t1, PT_R2(sp) # syscall number
1da177e4	147	negu v0 # error
8f5a00eb	148	sw t1, PT_R0(sp) # save it for syscall restarting
1da177e4 LT	149	1: sw v0, PT_R2(sp) # result
1da177e4 LT	150
9d37c405	151	2: j syscall_exit
1da177e4 LT	152
	153	/* ------------------------------------------------------------------------ */
	154
1da177e4 LT	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:
5b89c004	160	li v0, EFAULT
1da177e4 LT	161	sw v0, PT_R2(sp)
	162	li t0, 1 # set error flag
	163	sw t0, PT_R7(sp)
	164	j o32_syscall_exit
	165
	166	/*
	167	* The system call does not exist in this kernel
	168	*/
	169	illegal_syscall:
bda8229b	170	li v0, ENOSYS # error
1da177e4 LT	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)
	176
1da177e4	177	LEAF(sys_syscall)
1da177e4 LT	178	subu t0, a0, __NR_O32_Linux # check syscall number
1da177e4 LT	179	sltiu v0, t0, __NR_O32_Linux_syscalls + 1
e807f957	180	beqz t0, einval # do not recurse
46e12c07	181	sll t1, t0, 2
1da177e4	182	beqz v0, einval
1da177e4	183	lw t2, sys_call_table(t1) # syscall routine
e967ef02	184	sw a0, PT_R2(sp) # call routine directly on restart
1da177e4	185
1da177e4 LT	186	/* Some syscalls like execve get their arguments from struct pt_regs
	187	and claim zero arguments in the syscall table. Thus we have to
	188	assume the worst case and shuffle around all potential arguments.
	189	If you want performance, don't use indirect syscalls. */
	190
	191	move a0, a1 # shift argument registers
	192	move a1, a2
	193	move a2, a3
	194	lw a3, 16(sp)
	195	lw t4, 20(sp)
	196	lw t5, 24(sp)
	197	lw t6, 28(sp)
	198	sw t4, 16(sp)
	199	sw t5, 20(sp)
	200	sw t6, 24(sp)
	201	sw a0, PT_R4(sp) # .. and push back a0 - a3, some
	202	sw a1, PT_R5(sp) # syscalls expect them there
	203	sw a2, PT_R6(sp)
	204	sw a3, PT_R7(sp)
	205	sw a3, PT_R26(sp) # update a3 for syscall restarting
	206	jr t2
	207	/* Unreached */
	208
70342287	209	einval: li v0, -ENOSYS
1da177e4 LT	210	jr ra
	211	END(sys_syscall)
	212
46e12c07 RB	213	.align 2
	214	.type sys_call_table, @object
	215	EXPORT(sys_call_table)
	216	PTR sys_syscall /* 4000 */
	217	PTR sys_exit
	218	PTR __sys_fork
	219	PTR sys_read
	220	PTR sys_write
	221	PTR sys_open /* 4005 */
	222	PTR sys_close
	223	PTR sys_waitpid
	224	PTR sys_creat
	225	PTR sys_link
	226	PTR sys_unlink /* 4010 */
	227	PTR sys_execve
	228	PTR sys_chdir
	229	PTR sys_time
	230	PTR sys_mknod
	231	PTR sys_chmod /* 4015 */
	232	PTR sys_lchown
	233	PTR sys_ni_syscall
	234	PTR sys_ni_syscall /* was sys_stat */
	235	PTR sys_lseek
	236	PTR sys_getpid /* 4020 */
	237	PTR sys_mount
	238	PTR sys_oldumount
	239	PTR sys_setuid
	240	PTR sys_getuid
	241	PTR sys_stime /* 4025 */
	242	PTR sys_ptrace
	243	PTR sys_alarm
	244	PTR sys_ni_syscall /* was sys_fstat */
	245	PTR sys_pause
	246	PTR sys_utime /* 4030 */
	247	PTR sys_ni_syscall
	248	PTR sys_ni_syscall
	249	PTR sys_access
	250	PTR sys_nice
	251	PTR sys_ni_syscall /* 4035 */
	252	PTR sys_sync
	253	PTR sys_kill
	254	PTR sys_rename
	255	PTR sys_mkdir
	256	PTR sys_rmdir /* 4040 */
	257	PTR sys_dup
	258	PTR sysm_pipe
	259	PTR sys_times
	260	PTR sys_ni_syscall
	261	PTR sys_brk /* 4045 */
	262	PTR sys_setgid
	263	PTR sys_getgid
	264	PTR sys_ni_syscall /* was signal(2) */
	265	PTR sys_geteuid
	266	PTR sys_getegid /* 4050 */
	267	PTR sys_acct
	268	PTR sys_umount
	269	PTR sys_ni_syscall
	270	PTR sys_ioctl
	271	PTR sys_fcntl /* 4055 */
	272	PTR sys_ni_syscall
	273	PTR sys_setpgid
	274	PTR sys_ni_syscall
	275	PTR sys_olduname
	276	PTR sys_umask /* 4060 */
277	PTR sys_chroot
278	PTR sys_ustat
279	PTR sys_dup2
280	PTR sys_getppid
281	PTR sys_getpgrp /* 4065 */
282	PTR sys_setsid
283	PTR sys_sigaction
284	PTR sys_sgetmask
285	PTR sys_ssetmask
286	PTR sys_setreuid /* 4070 */
287	PTR sys_setregid
288	PTR sys_sigsuspend
289	PTR sys_sigpending
290	PTR sys_sethostname
291	PTR sys_setrlimit /* 4075 */
292	PTR sys_getrlimit
293	PTR sys_getrusage
294	PTR sys_gettimeofday
295	PTR sys_settimeofday
296	PTR sys_getgroups /* 4080 */
297	PTR sys_setgroups
298	PTR sys_ni_syscall /* old_select */
299	PTR sys_symlink
300	PTR sys_ni_syscall /* was sys_lstat */
301	PTR sys_readlink /* 4085 */
302	PTR sys_uselib
303	PTR sys_swapon
304	PTR sys_reboot
305	PTR sys_old_readdir
306	PTR sys_mips_mmap /* 4090 */
307	PTR sys_munmap
308	PTR sys_truncate
309	PTR sys_ftruncate
310	PTR sys_fchmod
311	PTR sys_fchown /* 4095 */
312	PTR sys_getpriority
313	PTR sys_setpriority
314	PTR sys_ni_syscall
315	PTR sys_statfs
316	PTR sys_fstatfs /* 4100 */
317	PTR sys_ni_syscall /* was ioperm(2) */
318	PTR sys_socketcall
319	PTR sys_syslog
320	PTR sys_setitimer
321	PTR sys_getitimer /* 4105 */
322	PTR sys_newstat
323	PTR sys_newlstat
324	PTR sys_newfstat
325	PTR sys_uname
326	PTR sys_ni_syscall /* 4110 was iopl(2) */
327	PTR sys_vhangup
328	PTR sys_ni_syscall /* was sys_idle() */
329	PTR sys_ni_syscall /* was sys_vm86 */
330	PTR sys_wait4
331	PTR sys_swapoff /* 4115 */
332	PTR sys_sysinfo
333	PTR sys_ipc
334	PTR sys_fsync
335	PTR sys_sigreturn
336	PTR __sys_clone /* 4120 */
337	PTR sys_setdomainname
338	PTR sys_newuname
339	PTR sys_ni_syscall /* sys_modify_ldt */
340	PTR sys_adjtimex
341	PTR sys_mprotect /* 4125 */
342	PTR sys_sigprocmask
343	PTR sys_ni_syscall /* was create_module */
344	PTR sys_init_module
345	PTR sys_delete_module
346	PTR sys_ni_syscall /* 4130 was get_kernel_syms */
347	PTR sys_quotactl
348	PTR sys_getpgid
349	PTR sys_fchdir
350	PTR sys_bdflush
351	PTR sys_sysfs /* 4135 */
352	PTR sys_personality
353	PTR sys_ni_syscall /* for afs_syscall */
354	PTR sys_setfsuid
355	PTR sys_setfsgid
356	PTR sys_llseek /* 4140 */
357	PTR sys_getdents
358	PTR sys_select
359	PTR sys_flock
360	PTR sys_msync
361	PTR sys_readv /* 4145 */
362	PTR sys_writev
363	PTR sys_cacheflush
364	PTR sys_cachectl
365	PTR sys_sysmips
366	PTR sys_ni_syscall /* 4150 */
367	PTR sys_getsid
368	PTR sys_fdatasync
369	PTR sys_sysctl
370	PTR sys_mlock
371	PTR sys_munlock /* 4155 */
372	PTR sys_mlockall
373	PTR sys_munlockall
374	PTR sys_sched_setparam
375	PTR sys_sched_getparam
376	PTR sys_sched_setscheduler /* 4160 */
377	PTR sys_sched_getscheduler
378	PTR sys_sched_yield
379	PTR sys_sched_get_priority_max
380	PTR sys_sched_get_priority_min
381	PTR sys_sched_rr_get_interval /* 4165 */
382	PTR sys_nanosleep
383	PTR sys_mremap
384	PTR sys_accept
385	PTR sys_bind
386	PTR sys_connect /* 4170 */
387	PTR sys_getpeername
388	PTR sys_getsockname
389	PTR sys_getsockopt
390	PTR sys_listen
391	PTR sys_recv /* 4175 */
392	PTR sys_recvfrom
393	PTR sys_recvmsg
394	PTR sys_send
395	PTR sys_sendmsg
396	PTR sys_sendto /* 4180 */
397	PTR sys_setsockopt
398	PTR sys_shutdown
399	PTR sys_socket
400	PTR sys_socketpair
401	PTR sys_setresuid /* 4185 */
402	PTR sys_getresuid
403	PTR sys_ni_syscall /* was sys_query_module */
404	PTR sys_poll
405	PTR sys_ni_syscall /* was nfsservctl */
406	PTR sys_setresgid /* 4190 */
407	PTR sys_getresgid
408	PTR sys_prctl
409	PTR sys_rt_sigreturn
410	PTR sys_rt_sigaction
411	PTR sys_rt_sigprocmask /* 4195 */
412	PTR sys_rt_sigpending
413	PTR sys_rt_sigtimedwait
414	PTR sys_rt_sigqueueinfo
415	PTR sys_rt_sigsuspend
416	PTR sys_pread64 /* 4200 */
417	PTR sys_pwrite64
418	PTR sys_chown
419	PTR sys_getcwd
420	PTR sys_capget
421	PTR sys_capset /* 4205 */
422	PTR sys_sigaltstack
423	PTR sys_sendfile
424	PTR sys_ni_syscall
425	PTR sys_ni_syscall
426	PTR sys_mips_mmap2 /* 4210 */
427	PTR sys_truncate64
428	PTR sys_ftruncate64
429	PTR sys_stat64
430	PTR sys_lstat64
431	PTR sys_fstat64 /* 4215 */
432	PTR sys_pivot_root
433	PTR sys_mincore
434	PTR sys_madvise
435	PTR sys_getdents64
436	PTR sys_fcntl64 /* 4220 */
437	PTR sys_ni_syscall
438	PTR sys_gettid
439	PTR sys_readahead
440	PTR sys_setxattr
441	PTR sys_lsetxattr /* 4225 */
442	PTR sys_fsetxattr
443	PTR sys_getxattr
444	PTR sys_lgetxattr
445	PTR sys_fgetxattr
446	PTR sys_listxattr /* 4230 */
447	PTR sys_llistxattr
448	PTR sys_flistxattr
449	PTR sys_removexattr
450	PTR sys_lremovexattr
451	PTR sys_fremovexattr /* 4235 */
452	PTR sys_tkill
453	PTR sys_sendfile64
454	PTR sys_futex
f088fc84 RB	455	#ifdef CONFIG_MIPS_MT_FPAFF
	456	/*
	457	* For FPU affinity scheduling on MIPS MT processors, we need to
	458	* intercept sys_sched_xxxaffinity() calls until we get a proper hook
0a0fca9d VK	459	* in kernel/sched/core.c. Considered only temporary we only support
	460	* these hooks for the 32-bit kernel - there is no MIPS64 MT processor
	461	* atm.
f088fc84	462	*/
46e12c07 RB	463	PTR mipsmt_sys_sched_setaffinity
46e12c07 RB	464	PTR mipsmt_sys_sched_getaffinity
f088fc84	465	#else
46e12c07 RB	466	PTR sys_sched_setaffinity
46e12c07 RB	467	PTR sys_sched_getaffinity /* 4240 */
f088fc84	468	#endif /* CONFIG_MIPS_MT_FPAFF */
46e12c07 RB	469	PTR sys_io_setup
	470	PTR sys_io_destroy
	471	PTR sys_io_getevents
	472	PTR sys_io_submit
	473	PTR sys_io_cancel /* 4245 */
	474	PTR sys_exit_group
	475	PTR sys_lookup_dcookie
	476	PTR sys_epoll_create
	477	PTR sys_epoll_ctl
	478	PTR sys_epoll_wait /* 4250 */
	479	PTR sys_remap_file_pages
	480	PTR sys_set_tid_address
	481	PTR sys_restart_syscall
	482	PTR sys_fadvise64_64
	483	PTR sys_statfs64 /* 4255 */
	484	PTR sys_fstatfs64
	485	PTR sys_timer_create
	486	PTR sys_timer_settime
	487	PTR sys_timer_gettime
	488	PTR sys_timer_getoverrun /* 4260 */
	489	PTR sys_timer_delete
	490	PTR sys_clock_settime
	491	PTR sys_clock_gettime
	492	PTR sys_clock_getres
	493	PTR sys_clock_nanosleep /* 4265 */
	494	PTR sys_tgkill
	495	PTR sys_utimes
	496	PTR sys_mbind
1ff1ad6b HC	497	PTR sys_get_mempolicy
1ff1ad6b HC	498	PTR sys_set_mempolicy /* 4270 */
46e12c07 RB	499	PTR sys_mq_open
	500	PTR sys_mq_unlink
	501	PTR sys_mq_timedsend
	502	PTR sys_mq_timedreceive
	503	PTR sys_mq_notify /* 4275 */
	504	PTR sys_mq_getsetattr
	505	PTR sys_ni_syscall /* sys_vserver */
	506	PTR sys_waitid
	507	PTR sys_ni_syscall /* available, was setaltroot */
	508	PTR sys_add_key /* 4280 */
	509	PTR sys_request_key
	510	PTR sys_keyctl
	511	PTR sys_set_thread_area
	512	PTR sys_inotify_init
	513	PTR sys_inotify_add_watch /* 4285 */
	514	PTR sys_inotify_rm_watch
	515	PTR sys_migrate_pages
	516	PTR sys_openat
	517	PTR sys_mkdirat
	518	PTR sys_mknodat /* 4290 */
	519	PTR sys_fchownat
	520	PTR sys_futimesat
	521	PTR sys_fstatat64
	522	PTR sys_unlinkat
	523	PTR sys_renameat /* 4295 */
	524	PTR sys_linkat
	525	PTR sys_symlinkat
	526	PTR sys_readlinkat
	527	PTR sys_fchmodat
	528	PTR sys_faccessat /* 4300 */
	529	PTR sys_pselect6
	530	PTR sys_ppoll
	531	PTR sys_unshare
	532	PTR sys_splice
	533	PTR sys_sync_file_range /* 4305 */
	534	PTR sys_tee
	535	PTR sys_vmsplice
	536	PTR sys_move_pages
	537	PTR sys_set_robust_list
	538	PTR sys_get_robust_list /* 4310 */
	539	PTR sys_kexec_load
	540	PTR sys_getcpu
	541	PTR sys_epoll_pwait
	542	PTR sys_ioprio_set
	543	PTR sys_ioprio_get /* 4315 */
	544	PTR sys_utimensat
	545	PTR sys_signalfd
	546	PTR sys_ni_syscall /* was timerfd */
	547	PTR sys_eventfd
	548	PTR sys_fallocate /* 4320 */
	549	PTR sys_timerfd_create
	550	PTR sys_timerfd_gettime
	551	PTR sys_timerfd_settime
	552	PTR sys_signalfd4
	553	PTR sys_eventfd2 /* 4325 */
	554	PTR sys_epoll_create1
	555	PTR sys_dup3
	556	PTR sys_pipe2
	557	PTR sys_inotify_init1
	558	PTR sys_preadv /* 4330 */
	559	PTR sys_pwritev
	560	PTR sys_rt_tgsigqueueinfo
	561	PTR sys_perf_event_open
	562	PTR sys_accept4
563	PTR sys_recvmmsg /* 4335 */
564	PTR sys_fanotify_init
565	PTR sys_fanotify_mark
566	PTR sys_prlimit64
567	PTR sys_name_to_handle_at
568	PTR sys_open_by_handle_at /* 4340 */
569	PTR sys_clock_adjtime
570	PTR sys_syncfs
571	PTR sys_sendmmsg
572	PTR sys_setns
573	PTR sys_process_vm_readv /* 4345 */
574	PTR sys_process_vm_writev
575	PTR sys_kcmp
576	PTR sys_finit_module
6776254b JH	577	PTR sys_sched_setattr
6776254b JH	578	PTR sys_sched_getattr /* 4350 */
367f0b50	579	PTR sys_renameat2
8855d608	580	PTR sys_seccomp
42944521 RB	581	PTR sys_getrandom
42944521 RB	582	PTR sys_memfd_create
5df4c8db	583	PTR sys_bpf /* 4355 */
389cdc5d	584	PTR sys_execveat