/*
   * 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 - 2000, 2001 by Ralf Baechle
   * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   * Copyright (C) 2001 MIPS Technologies, Inc.
   * Copyright (C) 2004 Thiemo Seufer
   *
   * Hairy, the userspace application uses a different argument passing
   * convention than the kernel, so we have to translate things from o32
   * to ABI64 calling convention.  64-bit syscalls are also processed
   * here for now.
   */

  #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/thread_info.h>
  #include <asm/unistd.h>
  #include <asm/sysmips.h>
  
  	.align  5
  NESTED(handle_sys, PT_SIZE, sp)
  	.set	noat
  	SAVE_SOME

  	TRACE_IRQS_ON_RELOAD

  	STI
  	.set	at
  	ld	t1, PT_EPC(sp)		# skip syscall on return
  
  	dsubu	t0, v0, __NR_O32_Linux	# check syscall number
  	sltiu	t0, t0, __NR_O32_Linux_syscalls + 1
  	daddiu	t1, 4			# skip to next instruction
  	sd	t1, PT_EPC(sp)
  	beqz	t0, not_o32_scall
  #if 0
   SAVE_ALL
   move a1, v0
   PRINT("Scall %ld
  ")
   RESTORE_ALL
  #endif
  
  	/* We don't want to stumble over broken sign extensions from
  	   userland. O32 does never use the upper half. */
  	sll	a0, a0, 0
  	sll	a1, a1, 0
  	sll	a2, a2, 0
  	sll	a3, a3, 0
  
  	dsll	t0, v0, 3		# offset into table
  	ld	t2, (sys_call_table - (__NR_O32_Linux * 8))(t0)
  
  	sd	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).
  	 *
  	 * 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.
  	 */
  	ld	t0, PT_R29(sp)		# get old user stack pointer
  	daddu	t1, t0, 32
  	bltz	t1, bad_stack
  
  1:	lw	a4, 16(t0)		# argument #5 from usp
  2:	lw	a5, 20(t0)		# argument #6 from usp
  3:	lw	a6, 24(t0)		# argument #7 from usp
  4:	lw	a7, 28(t0)		# argument #8 from usp (for indirect syscalls)
  
  	.section __ex_table,"a"
  	PTR	1b, bad_stack
  	PTR	2b, bad_stack
  	PTR	3b, bad_stack
  	PTR	4b, bad_stack
  	.previous
  
  	li	t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
  	LONG_L	t0, TI_FLAGS($28)	# syscall tracing enabled?
  	and	t0, t1, t0
  	bnez	t0, trace_a_syscall
  
  	jalr	t2			# Do The Real Thing (TM)
  
  	li	t0, -EMAXERRNO - 1	# error?
  	sltu	t0, t0, v0
  	sd	t0, PT_R7(sp)		# set error flag
  	beqz	t0, 1f

  	ld	t1, PT_R2(sp)		# syscall number

  	dnegu	v0			# error

  	sd	t1, PT_R0(sp)		# save it for syscall restarting

  1:	sd	v0, PT_R2(sp)		# result
  
  o32_syscall_exit:
  	local_irq_disable		# make need_resched and
  					# signals dont change between
  					# sampling and return
  	LONG_L	a2, TI_FLAGS($28)
  	li	t0, _TIF_ALLWORK_MASK
  	and	t0, a2, t0
  	bnez	t0, o32_syscall_exit_work
  
  	j	restore_partial
  
  o32_syscall_exit_work:
  	j	syscall_exit_work_partial
  
  /* ------------------------------------------------------------------------ */
  
  trace_a_syscall:
  	SAVE_STATIC
  	sd	a4, PT_R8(sp)		# Save argument registers
  	sd	a5, PT_R9(sp)
  	sd	a6, PT_R10(sp)
  	sd	a7, PT_R11(sp)		# For indirect syscalls
  
  	move	s0, t2			# Save syscall pointer
  	move	a0, sp

  	jal	syscall_trace_enter

  	move	t0, s0
  	RESTORE_STATIC

  	ld	a0, PT_R4(sp)		# Restore argument registers
  	ld	a1, PT_R5(sp)
  	ld	a2, PT_R6(sp)
  	ld	a3, PT_R7(sp)
  	ld	a4, PT_R8(sp)
  	ld	a5, PT_R9(sp)
  	ld	a6, PT_R10(sp)
  	ld	a7, PT_R11(sp)		# For indirect syscalls

  	jalr	t0

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

  	ld	t1, PT_R2(sp)		# syscall number

  	dnegu	v0			# error

  	sd	t1, PT_R0(sp)		# save it for syscall restarting

  1:	sd	v0, PT_R2(sp)		# result
  
  	j	syscall_exit
  
  /* ------------------------------------------------------------------------ */
  
  	/*
  	 * The stackpointer for a call with more than 4 arguments is bad.
  	 */
  bad_stack:

  	li	v0, EFAULT

  	sd	v0, PT_R2(sp)
  	li	t0, 1			# set error flag
  	sd	t0, PT_R7(sp)
  	j	o32_syscall_exit
  
  not_o32_scall:
  	/*
  	 * This is not an o32 compatibility syscall, pass it on
  	 * to the 64-bit syscall handlers.
  	 */
  #ifdef CONFIG_MIPS32_N32
  	j	handle_sysn32
  #else
  	j	handle_sys64
  #endif
  	END(handle_sys)
  
  LEAF(sys32_syscall)

  	subu	t0, a0, __NR_O32_Linux	# check syscall number
  	sltiu	v0, t0, __NR_O32_Linux_syscalls + 1
  	beqz	t0, einval		# do not recurse
  	dsll	t1, t0, 3

  	beqz	v0, einval

  	ld	t2, sys_call_table(t1)		# syscall routine

  
  	move	a0, a1			# shift argument registers
  	move	a1, a2
  	move	a2, a3
  	move	a3, a4
  	move	a4, a5
  	move	a5, a6
  	move	a6, a7
  	sd	a0, PT_R4(sp)		# ... and push back a0 - a3, some
  	sd	a1, PT_R5(sp)		# syscalls expect them there
  	sd	a2, PT_R6(sp)
  	sd	a3, PT_R7(sp)
  	sd	a3, PT_R26(sp)		# update a3 for syscall restarting
  	jr	t2
  	/* Unreached */

  einval:	li	v0, -ENOSYS

  	jr	ra
  	END(sys32_syscall)
  
  	.align	3
  	.type	sys_call_table,@object
  sys_call_table:
  	PTR	sys32_syscall			/* 4000 */
  	PTR	sys_exit
  	PTR	sys_fork
  	PTR	sys_read
  	PTR	sys_write

  	PTR	compat_sys_open			/* 4005 */

  	PTR	sys_close
  	PTR	sys_waitpid
  	PTR	sys_creat
  	PTR	sys_link
  	PTR	sys_unlink			/* 4010 */
  	PTR	sys32_execve
  	PTR	sys_chdir
  	PTR	compat_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	compat_sys_mount

  	PTR	sys_oldumount
  	PTR	sys_setuid
  	PTR	sys_getuid
  	PTR	compat_sys_stime		/* 4025 */

  	PTR	compat_sys_ptrace

  	PTR	sys_alarm
  	PTR	sys_ni_syscall			/* was sys_fstat */
  	PTR	sys_pause
  	PTR	compat_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	compat_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	compat_sys_ioctl
  	PTR	compat_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	compat_sys_ustat

  	PTR	sys_dup2
  	PTR	sys_getppid
  	PTR	sys_getpgrp			/* 4065 */
  	PTR	sys_setsid

  	PTR	sys_32_sigaction

  	PTR	sys_sgetmask
  	PTR	sys_ssetmask
  	PTR	sys_setreuid			/* 4070 */
  	PTR	sys_setregid
  	PTR	sys32_sigsuspend
  	PTR	compat_sys_sigpending
  	PTR	sys_sethostname
  	PTR	compat_sys_setrlimit		/* 4075 */
  	PTR	compat_sys_getrlimit
  	PTR	compat_sys_getrusage

  	PTR	compat_sys_gettimeofday
  	PTR	compat_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	compat_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	compat_sys_statfs
  	PTR	compat_sys_fstatfs		/* 4100 */
  	PTR	sys_ni_syscall			/* sys_ioperm */

  	PTR	compat_sys_socketcall

  	PTR	sys_syslog
  	PTR	compat_sys_setitimer
  	PTR	compat_sys_getitimer		/* 4105 */
  	PTR	compat_sys_newstat
  	PTR	compat_sys_newlstat
  	PTR	compat_sys_newfstat
  	PTR	sys_uname
  	PTR	sys_ni_syscall			/* sys_ioperm  *//* 4110 */
  	PTR	sys_vhangup
  	PTR	sys_ni_syscall			/* was sys_idle	 */
  	PTR	sys_ni_syscall			/* sys_vm86 */

  	PTR	compat_sys_wait4

  	PTR	sys_swapoff			/* 4115 */

  	PTR	compat_sys_sysinfo

  	PTR	sys_32_ipc

  	PTR	sys_fsync
  	PTR	sys32_sigreturn

  	PTR	sys32_clone			/* 4120 */

  	PTR	sys_setdomainname

  	PTR	sys_newuname

  	PTR	sys_ni_syscall			/* sys_modify_ldt */

  	PTR	compat_sys_adjtimex

  	PTR	sys_mprotect			/* 4125 */
  	PTR	compat_sys_sigprocmask
  	PTR	sys_ni_syscall			/* was creat_module */
  	PTR	sys_init_module
  	PTR	sys_delete_module
  	PTR	sys_ni_syscall			/* 4130, get_kernel_syms */
  	PTR	sys_quotactl
  	PTR	sys_getpgid
  	PTR	sys_fchdir
  	PTR	sys_bdflush
  	PTR	sys_sysfs			/* 4135 */

  	PTR	sys_32_personality

  	PTR	sys_ni_syscall	 		/* for afs_syscall */
  	PTR	sys_setfsuid
  	PTR	sys_setfsgid

  	PTR	sys_32_llseek			/* 4140 */

  	PTR	compat_sys_getdents

  	PTR	compat_sys_select
  	PTR	sys_flock
  	PTR	sys_msync
  	PTR	compat_sys_readv		/* 4145 */
  	PTR	compat_sys_writev
  	PTR	sys_cacheflush
  	PTR	sys_cachectl
  	PTR	sys_sysmips
  	PTR	sys_ni_syscall			/* 4150 */
  	PTR	sys_getsid
  	PTR	sys_fdatasync

  	PTR	compat_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_32_sched_rr_get_interval 	/* 4165 */

  	PTR	compat_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	compat_sys_recv			/* 4175 */
  	PTR	compat_sys_recvfrom

  	PTR	compat_sys_recvmsg
  	PTR	sys_send
  	PTR	compat_sys_sendmsg
  	PTR	sys_sendto			/* 4180 */
  	PTR	compat_sys_setsockopt
  	PTR	sys_shutdown
  	PTR	sys_socket
  	PTR	sys_socketpair
  	PTR	sys_setresuid			/* 4185 */
  	PTR	sys_getresuid
  	PTR	sys_ni_syscall			/* was query_module */
  	PTR	sys_poll

  	PTR	sys_ni_syscall			/* was nfsservctl */

  	PTR	sys_setresgid			/* 4190 */
  	PTR	sys_getresgid
  	PTR	sys_prctl
  	PTR	sys32_rt_sigreturn

  	PTR	sys_32_rt_sigaction
  	PTR	sys_32_rt_sigprocmask 		/* 4195 */
  	PTR	sys_32_rt_sigpending

  	PTR	compat_sys_rt_sigtimedwait

  	PTR	sys_32_rt_sigqueueinfo

  	PTR	sys32_rt_sigsuspend

  	PTR	sys_32_pread			/* 4200 */
  	PTR	sys_32_pwrite

  	PTR	sys_chown
  	PTR	sys_getcwd
  	PTR	sys_capget
  	PTR	sys_capset			/* 4205 */
  	PTR	sys32_sigaltstack

  	PTR	sys_32_sendfile

  	PTR	sys_ni_syscall
  	PTR	sys_ni_syscall

  	PTR	sys_mips_mmap2			/* 4210 */
  	PTR	sys_32_truncate64
  	PTR	sys_32_ftruncate64

  	PTR	sys_newstat
  	PTR	sys_newlstat
  	PTR	sys_newfstat			/* 4215 */
  	PTR	sys_pivot_root
  	PTR	sys_mincore
  	PTR	sys_madvise
  	PTR	sys_getdents64
  	PTR	compat_sys_fcntl64		/* 4220 */
  	PTR	sys_ni_syscall
  	PTR	sys_gettid
  	PTR	sys32_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_32_futex

  	PTR	compat_sys_sched_setaffinity
  	PTR	compat_sys_sched_getaffinity	/* 4240 */

  	PTR	compat_sys_io_setup

  	PTR	sys_io_destroy

  	PTR	compat_sys_io_getevents
  	PTR	compat_sys_io_submit

  	PTR	sys_io_cancel			/* 4245 */
  	PTR	sys_exit_group

  	PTR	sys32_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	sys32_fadvise64_64

  	PTR	compat_sys_statfs64		/* 4255 */
  	PTR	compat_sys_fstatfs64

  	PTR	compat_sys_timer_create

  	PTR	compat_sys_timer_settime
  	PTR	compat_sys_timer_gettime
  	PTR	sys_timer_getoverrun		/* 4260 */
  	PTR	sys_timer_delete
  	PTR	compat_sys_clock_settime
  	PTR	compat_sys_clock_gettime
  	PTR	compat_sys_clock_getres
  	PTR	compat_sys_clock_nanosleep	/* 4265 */
  	PTR	sys_tgkill
  	PTR	compat_sys_utimes
  	PTR	sys_ni_syscall			/* sys_mbind */
  	PTR	sys_ni_syscall			/* sys_get_mempolicy */
  	PTR	sys_ni_syscall			/* 4270 sys_set_mempolicy */
  	PTR	compat_sys_mq_open
  	PTR	sys_mq_unlink
  	PTR	compat_sys_mq_timedsend
  	PTR	compat_sys_mq_timedreceive
  	PTR	compat_sys_mq_notify		/* 4275 */
  	PTR	compat_sys_mq_getsetattr
  	PTR	sys_ni_syscall			/* sys_vserver */

  	PTR	sys_32_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	compat_sys_openat
  	PTR	sys_mkdirat
  	PTR	sys_mknodat			/* 4290 */
  	PTR	sys_fchownat
  	PTR	compat_sys_futimesat

  	PTR	sys_newfstatat

  	PTR	sys_unlinkat
  	PTR	sys_renameat			/* 4295 */
  	PTR	sys_linkat
  	PTR	sys_symlinkat
  	PTR	sys_readlinkat
  	PTR	sys_fchmodat
  	PTR	sys_faccessat			/* 4300 */

  	PTR	compat_sys_pselect6

  	PTR	compat_sys_ppoll

  	PTR	sys_unshare

  	PTR	sys_splice

  	PTR	sys32_sync_file_range		/* 4305 */

  	PTR	sys_tee

  	PTR	compat_sys_vmsplice

  	PTR	compat_sys_move_pages

  	PTR	compat_sys_set_robust_list
  	PTR	compat_sys_get_robust_list	/* 4310 */

  	PTR	compat_sys_kexec_load

  	PTR	sys_getcpu

  	PTR	compat_sys_epoll_pwait

  	PTR	sys_ioprio_set
  	PTR	sys_ioprio_get			/* 4315 */

  	PTR	compat_sys_utimensat
  	PTR	compat_sys_signalfd

  	PTR	sys_ni_syscall			/* was timerfd */

  	PTR	sys_eventfd

  	PTR	sys32_fallocate			/* 4320 */

  	PTR	sys_timerfd_create

  	PTR	compat_sys_timerfd_gettime
  	PTR	compat_sys_timerfd_settime

  	PTR	compat_sys_signalfd4
  	PTR	sys_eventfd2			/* 4325 */
  	PTR	sys_epoll_create1
  	PTR	sys_dup3
  	PTR	sys_pipe2
  	PTR	sys_inotify_init1

  	PTR	compat_sys_preadv		/* 4330 */
  	PTR	compat_sys_pwritev

  	PTR	compat_sys_rt_tgsigqueueinfo

  	PTR	sys_perf_event_open

  	PTR	sys_accept4

  	PTR	compat_sys_recvmmsg		/* 4335 */
  	PTR	sys_fanotify_init
  	PTR	sys_32_fanotify_mark
  	PTR	sys_prlimit64

  	PTR	sys_name_to_handle_at
  	PTR	compat_sys_open_by_handle_at	/* 4340 */
  	PTR	compat_sys_clock_adjtime

  	PTR	sys_syncfs

  	PTR	compat_sys_sendmmsg

  	PTR	sys_setns

  	PTR	compat_sys_process_vm_readv	/* 4345 */
  	PTR	compat_sys_process_vm_writev

  	.size	sys_call_table,.-sys_call_table