[mirror_ubuntu-hirsute-kernel.git] / arch / mips / kernel / scall64-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 - 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\n")
 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, (sys32_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

load_a4: lw	a4, 16(t0)		# argument #5 from usp
load_a5: lw	a5, 20(t0)		# argument #6 from usp
load_a6: lw	a6, 24(t0)		# argument #7 from usp
load_a7: lw	a7, 28(t0)		# argument #8 from usp
loads_done:

	.section __ex_table,"a"
	PTR	load_a4, bad_stack_a4
	PTR	load_a5, bad_stack_a5
	PTR	load_a6, bad_stack_a6
	PTR	load_a7, bad_stack_a7
	.previous

	li	t1, _TIF_WORK_SYSCALL_ENTRY
	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:
	j	syscall_exit_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
	/*
	 * absolute syscall number is in v0 unless we called syscall(__NR_###)
	 * where the real syscall number is in a0
	 * note: NR_syscall is the first O32 syscall but the macro is
	 * only defined when compiling with -mabi=32 (CONFIG_32BIT)
	 * therefore __NR_O32_Linux is used (4000)
	 */
	.set	push
	.set	reorder
	subu	t1, v0,  __NR_O32_Linux
	move	a1, v0
	bnez	t1, 1f /* __NR_syscall at offset 0 */
	lw	a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
	.set	pop

1:	jal	syscall_trace_enter

	bltz	v0, 2f			# seccomp failed? Skip syscall

	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

2:	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

bad_stack_a4:
	li	a4, 0
	b	load_a5

bad_stack_a5:
	li	a5, 0
	b	load_a6

bad_stack_a6:
	li	a6, 0
	b	load_a7

bad_stack_a7:
	li	a7, 0
	b	loads_done

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, sys32_call_table(t1)		# syscall routine
	sd	a0, PT_R2(sp)		# call routine directly on restart

	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	sys32_call_table,@object
EXPORT(sys32_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	compat_sys_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	compat_sys_truncate
	PTR	compat_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	compat_sys_ipc
	PTR	sys_fsync
	PTR	sys32_sigreturn
	PTR	__sys_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	compat_sys_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	compat_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	compat_sys_rt_sigaction
	PTR	compat_sys_rt_sigprocmask	/* 4195 */
	PTR	compat_sys_rt_sigpending
	PTR	compat_sys_rt_sigtimedwait
	PTR	compat_sys_rt_sigqueueinfo
	PTR	compat_sys_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	compat_sys_sigaltstack
	PTR	compat_sys_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	compat_sys_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	compat_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	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	compat_sys_mbind
	PTR	compat_sys_get_mempolicy
	PTR	compat_sys_set_mempolicy	/* 4270 */
	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	compat_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	compat_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	compat_sys_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
	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	compat_sys_execveat
	PTR	sys_userfaultfd
	PTR	sys_membarrier
	.size	sys32_call_table,.-sys32_call_table
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	*
	6	* Copyright (C) 1995 - 2000, 2001 by Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Copyright (C) 2001 MIPS Technologies, Inc.
	9	* Copyright (C) 2004 Thiemo Seufer
	10	*
	11	* Hairy, the userspace application uses a different argument passing
	12	* convention than the kernel, so we have to translate things from o32
70342287	13	* to ABI64 calling convention. 64-bit syscalls are also processed
1da177e4 LT	14	* here for now.
1da177e4 LT	15	*/
1da177e4 LT	16	#include <linux/errno.h>
	17	#include <asm/asm.h>
	18	#include <asm/asmmacro.h>
192ef366	19	#include <asm/irqflags.h>
1da177e4 LT	20	#include <asm/mipsregs.h>
	21	#include <asm/regdef.h>
	22	#include <asm/stackframe.h>
	23	#include <asm/thread_info.h>
	24	#include <asm/unistd.h>
	25	#include <asm/sysmips.h>
	26
70342287	27	.align 5
1da177e4 LT	28	NESTED(handle_sys, PT_SIZE, sp)
	29	.set noat
	30	SAVE_SOME
eae6c0da	31	TRACE_IRQS_ON_RELOAD
1da177e4 LT	32	STI
	33	.set at
	34	ld t1, PT_EPC(sp) # skip syscall on return
	35
	36	dsubu t0, v0, __NR_O32_Linux # check syscall number
	37	sltiu t0, t0, __NR_O32_Linux_syscalls + 1
	38	daddiu t1, 4 # skip to next instruction
	39	sd t1, PT_EPC(sp)
	40	beqz t0, not_o32_scall
	41	#if 0
	42	SAVE_ALL
	43	move a1, v0
	44	PRINT("Scall %ld\n")
	45	RESTORE_ALL
	46	#endif
	47
	48	/* We don't want to stumble over broken sign extensions from
	49	userland. O32 does never use the upper half. */
	50	sll a0, a0, 0
	51	sll a1, a1, 0
	52	sll a2, a2, 0
	53	sll a3, a3, 0
	54
	55	dsll t0, v0, 3 # offset into table
2a9c2751	56	ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0)
1da177e4 LT	57
	58	sd a3, PT_R26(sp) # save a3 for syscall restarting
	59
	60	/*
	61	* More than four arguments. Try to deal with it by copying the
	62	* stack arguments from the user stack to the kernel stack.
	63	* This Sucks (TM).
	64	*
	65	* We intentionally keep the kernel stack a little below the top of
	66	* userspace so we don't have to do a slower byte accurate check here.
	67	*/
	68	ld t0, PT_R29(sp) # get old user stack pointer
	69	daddu t1, t0, 32
	70	bltz t1, bad_stack
	71
7928eb03 RB	72	load_a4: lw a4, 16(t0) # argument #5 from usp
	73	load_a5: lw a5, 20(t0) # argument #6 from usp
	74	load_a6: lw a6, 24(t0) # argument #7 from usp
	75	load_a7: lw a7, 28(t0) # argument #8 from usp
	76	loads_done:
1da177e4 LT	77
1da177e4 LT	78	.section __ex_table,"a"
7928eb03 RB	79	PTR load_a4, bad_stack_a4
	80	PTR load_a5, bad_stack_a5
	81	PTR load_a6, bad_stack_a6
	82	PTR load_a7, bad_stack_a7
1da177e4 LT	83	.previous
1da177e4 LT	84
e7f3b48a	85	li t1, _TIF_WORK_SYSCALL_ENTRY
1da177e4 LT	86	LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
	87	and t0, t1, t0
	88	bnez t0, trace_a_syscall
	89
	90	jalr t2 # Do The Real Thing (TM)
	91
	92	li t0, -EMAXERRNO - 1 # error?
	93	sltu t0, t0, v0
	94	sd t0, PT_R7(sp) # set error flag
	95	beqz t0, 1f
	96
8f5a00eb	97	ld t1, PT_R2(sp) # syscall number
1da177e4	98	dnegu v0 # error
8f5a00eb	99	sd t1, PT_R0(sp) # save it for syscall restarting
1da177e4 LT	100	1: sd v0, PT_R2(sp) # result
	101
	102	o32_syscall_exit:
02f884ed	103	j syscall_exit_partial
1da177e4 LT	104
	105	/* ------------------------------------------------------------------------ */
	106
	107	trace_a_syscall:
	108	SAVE_STATIC
	109	sd a4, PT_R8(sp) # Save argument registers
	110	sd a5, PT_R9(sp)
	111	sd a6, PT_R10(sp)
	112	sd a7, PT_R11(sp) # For indirect syscalls
	113
	114	move s0, t2 # Save syscall pointer
	115	move a0, sp
4c21b8fd	116	/*
ad61ba23	117	* absolute syscall number is in v0 unless we called syscall(__NR_###)
4c21b8fd MC	118	* where the real syscall number is in a0
	119	* note: NR_syscall is the first O32 syscall but the macro is
	120	* only defined when compiling with -mabi=32 (CONFIG_32BIT)
	121	* therefore __NR_O32_Linux is used (4000)
	122	*/
ad61ba23 MC	123	.set push
	124	.set reorder
	125	subu t1, v0, __NR_O32_Linux
	126	move a1, v0
	127	bnez t1, 1f /* __NR_syscall at offset 0 */
	128	lw a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
	129	.set pop
4c21b8fd MC	130
4c21b8fd MC	131	1: jal syscall_trace_enter
1da177e4	132
9d37c405 MC	133	bltz v0, 2f # seccomp failed? Skip syscall
9d37c405 MC	134
04a7052c RB	135	move t0, s0
04a7052c RB	136	RESTORE_STATIC
1da177e4 LT	137	ld a0, PT_R4(sp) # Restore argument registers
	138	ld a1, PT_R5(sp)
	139	ld a2, PT_R6(sp)
	140	ld a3, PT_R7(sp)
	141	ld a4, PT_R8(sp)
	142	ld a5, PT_R9(sp)
	143	ld a6, PT_R10(sp)
	144	ld a7, PT_R11(sp) # For indirect syscalls
04a7052c	145	jalr t0
1da177e4 LT	146
	147	li t0, -EMAXERRNO - 1 # error?
	148	sltu t0, t0, v0
	149	sd t0, PT_R7(sp) # set error flag
	150	beqz t0, 1f
	151
8f5a00eb	152	ld t1, PT_R2(sp) # syscall number
1da177e4	153	dnegu v0 # error
8f5a00eb	154	sd t1, PT_R0(sp) # save it for syscall restarting
1da177e4 LT	155	1: sd v0, PT_R2(sp) # result
1da177e4 LT	156
9d37c405	157	2: j syscall_exit
1da177e4 LT	158
	159	/* ------------------------------------------------------------------------ */
	160
	161	/*
	162	* The stackpointer for a call with more than 4 arguments is bad.
	163	*/
	164	bad_stack:
5b89c004	165	li v0, EFAULT
1da177e4 LT	166	sd v0, PT_R2(sp)
	167	li t0, 1 # set error flag
	168	sd t0, PT_R7(sp)
	169	j o32_syscall_exit
	170
7928eb03 RB	171	bad_stack_a4:
	172	li a4, 0
	173	b load_a5
	174
	175	bad_stack_a5:
	176	li a5, 0
	177	b load_a6
	178
	179	bad_stack_a6:
	180	li a6, 0
	181	b load_a7
	182
	183	bad_stack_a7:
	184	li a7, 0
	185	b loads_done
	186
1da177e4 LT	187	not_o32_scall:
	188	/*
	189	* This is not an o32 compatibility syscall, pass it on
	190	* to the 64-bit syscall handlers.
	191	*/
	192	#ifdef CONFIG_MIPS32_N32
	193	j handle_sysn32
	194	#else
	195	j handle_sys64
	196	#endif
	197	END(handle_sys)
	198
	199	LEAF(sys32_syscall)
e807f957 VM	200	subu t0, a0, __NR_O32_Linux # check syscall number
	201	sltiu v0, t0, __NR_O32_Linux_syscalls + 1
	202	beqz t0, einval # do not recurse
	203	dsll t1, t0, 3
1da177e4	204	beqz v0, einval
2a9c2751	205	ld t2, sys32_call_table(t1) # syscall routine
e967ef02	206	sd a0, PT_R2(sp) # call routine directly on restart
1da177e4 LT	207
	208	move a0, a1 # shift argument registers
	209	move a1, a2
	210	move a2, a3
	211	move a3, a4
	212	move a4, a5
	213	move a5, a6
	214	move a6, a7
	215	sd a0, PT_R4(sp) # ... and push back a0 - a3, some
	216	sd a1, PT_R5(sp) # syscalls expect them there
	217	sd a2, PT_R6(sp)
	218	sd a3, PT_R7(sp)
	219	sd a3, PT_R26(sp) # update a3 for syscall restarting
	220	jr t2
	221	/* Unreached */
	222
70342287	223	einval: li v0, -ENOSYS
1da177e4 LT	224	jr ra
	225	END(sys32_syscall)
	226
	227	.align 3
2a9c2751 RB	228	.type sys32_call_table,@object
2a9c2751 RB	229	EXPORT(sys32_call_table)
1da177e4 LT	230	PTR sys32_syscall /* 4000 */
1da177e4 LT	231	PTR sys_exit
50150d2b	232	PTR __sys_fork
1da177e4 LT	233	PTR sys_read
1da177e4 LT	234	PTR sys_write
7155262e	235	PTR compat_sys_open /* 4005 */
1da177e4 LT	236	PTR sys_close
	237	PTR sys_waitpid
	238	PTR sys_creat
	239	PTR sys_link
	240	PTR sys_unlink /* 4010 */
baf9ff74	241	PTR compat_sys_execve
1da177e4 LT	242	PTR sys_chdir
	243	PTR compat_sys_time
	244	PTR sys_mknod
	245	PTR sys_chmod /* 4015 */
	246	PTR sys_lchown
	247	PTR sys_ni_syscall
	248	PTR sys_ni_syscall /* was sys_stat */
	249	PTR sys_lseek
	250	PTR sys_getpid /* 4020 */
089c7e7f	251	PTR compat_sys_mount
1da177e4 LT	252	PTR sys_oldumount
	253	PTR sys_setuid
	254	PTR sys_getuid
	255	PTR compat_sys_stime /* 4025 */
5d9a76cd	256	PTR compat_sys_ptrace
1da177e4 LT	257	PTR sys_alarm
	258	PTR sys_ni_syscall /* was sys_fstat */
	259	PTR sys_pause
	260	PTR compat_sys_utime /* 4030 */
	261	PTR sys_ni_syscall
	262	PTR sys_ni_syscall
	263	PTR sys_access
	264	PTR sys_nice
	265	PTR sys_ni_syscall /* 4035 */
	266	PTR sys_sync
	267	PTR sys_kill
	268	PTR sys_rename
	269	PTR sys_mkdir
	270	PTR sys_rmdir /* 4040 */
	271	PTR sys_dup
8213bbf9	272	PTR sysm_pipe
1da177e4 LT	273	PTR compat_sys_times
	274	PTR sys_ni_syscall
	275	PTR sys_brk /* 4045 */
	276	PTR sys_setgid
	277	PTR sys_getgid
	278	PTR sys_ni_syscall /* was signal 2 */
	279	PTR sys_geteuid
	280	PTR sys_getegid /* 4050 */
	281	PTR sys_acct
	282	PTR sys_umount
	283	PTR sys_ni_syscall
	284	PTR compat_sys_ioctl
	285	PTR compat_sys_fcntl /* 4055 */
	286	PTR sys_ni_syscall
	287	PTR sys_setpgid
	288	PTR sys_ni_syscall
	289	PTR sys_olduname
	290	PTR sys_umask /* 4060 */
	291	PTR sys_chroot
2b1c6bd7	292	PTR compat_sys_ustat
1da177e4 LT	293	PTR sys_dup2
	294	PTR sys_getppid
	295	PTR sys_getpgrp /* 4065 */
	296	PTR sys_setsid
dbda6ac0	297	PTR sys_32_sigaction
1da177e4 LT	298	PTR sys_sgetmask
	299	PTR sys_ssetmask
	300	PTR sys_setreuid /* 4070 */
	301	PTR sys_setregid
	302	PTR sys32_sigsuspend
	303	PTR compat_sys_sigpending
	304	PTR sys_sethostname
	305	PTR compat_sys_setrlimit /* 4075 */
	306	PTR compat_sys_getrlimit
	307	PTR compat_sys_getrusage
b418da16 CH	308	PTR compat_sys_gettimeofday
b418da16 CH	309	PTR compat_sys_settimeofday
1da177e4 LT	310	PTR sys_getgroups /* 4080 */
	311	PTR sys_setgroups
	312	PTR sys_ni_syscall /* old_select */
	313	PTR sys_symlink
	314	PTR sys_ni_syscall /* was sys_lstat */
	315	PTR sys_readlink /* 4085 */
	316	PTR sys_uselib
	317	PTR sys_swapon
	318	PTR sys_reboot
2fd628fe	319	PTR compat_sys_old_readdir
dbda6ac0	320	PTR sys_mips_mmap /* 4090 */
1da177e4	321	PTR sys_munmap
3f6d078d AV	322	PTR compat_sys_truncate
3f6d078d AV	323	PTR compat_sys_ftruncate
1da177e4 LT	324	PTR sys_fchmod
	325	PTR sys_fchown /* 4095 */
	326	PTR sys_getpriority
	327	PTR sys_setpriority
	328	PTR sys_ni_syscall
	329	PTR compat_sys_statfs
	330	PTR compat_sys_fstatfs /* 4100 */
	331	PTR sys_ni_syscall /* sys_ioperm */
08274cef	332	PTR compat_sys_socketcall
1da177e4 LT	333	PTR sys_syslog
	334	PTR compat_sys_setitimer
	335	PTR compat_sys_getitimer /* 4105 */
	336	PTR compat_sys_newstat
	337	PTR compat_sys_newlstat
	338	PTR compat_sys_newfstat
	339	PTR sys_uname
	340	PTR sys_ni_syscall /* sys_ioperm // 4110 */
	341	PTR sys_vhangup
	342	PTR sys_ni_syscall /* was sys_idle */
	343	PTR sys_ni_syscall /* sys_vm86 */
b6e203d8	344	PTR compat_sys_wait4
1da177e4	345	PTR sys_swapoff /* 4115 */
d4d23add	346	PTR compat_sys_sysinfo
56e41d3c	347	PTR compat_sys_ipc
1da177e4 LT	348	PTR sys_fsync
1da177e4 LT	349	PTR sys32_sigreturn
50150d2b	350	PTR __sys_clone /* 4120 */
1da177e4	351	PTR sys_setdomainname
e28cbf22	352	PTR sys_newuname
1da177e4	353	PTR sys_ni_syscall /* sys_modify_ldt */
3158e941	354	PTR compat_sys_adjtimex
1da177e4 LT	355	PTR sys_mprotect /* 4125 */
	356	PTR compat_sys_sigprocmask
	357	PTR sys_ni_syscall /* was creat_module */
	358	PTR sys_init_module
	359	PTR sys_delete_module
	360	PTR sys_ni_syscall /* 4130, get_kernel_syms */
	361	PTR sys_quotactl
	362	PTR sys_getpgid
	363	PTR sys_fchdir
	364	PTR sys_bdflush
	365	PTR sys_sysfs /* 4135 */
dbda6ac0	366	PTR sys_32_personality
70342287	367	PTR sys_ni_syscall /* for afs_syscall */
1da177e4 LT	368	PTR sys_setfsuid
1da177e4 LT	369	PTR sys_setfsgid
dbda6ac0	370	PTR sys_32_llseek /* 4140 */
2fd628fe	371	PTR compat_sys_getdents
1da177e4 LT	372	PTR compat_sys_select
	373	PTR sys_flock
	374	PTR sys_msync
	375	PTR compat_sys_readv /* 4145 */
	376	PTR compat_sys_writev
	377	PTR sys_cacheflush
	378	PTR sys_cachectl
	379	PTR sys_sysmips
	380	PTR sys_ni_syscall /* 4150 */
	381	PTR sys_getsid
	382	PTR sys_fdatasync
aff639cd	383	PTR compat_sys_sysctl
1da177e4 LT	384	PTR sys_mlock
	385	PTR sys_munlock /* 4155 */
	386	PTR sys_mlockall
	387	PTR sys_munlockall
	388	PTR sys_sched_setparam
	389	PTR sys_sched_getparam
70342287	390	PTR sys_sched_setscheduler /* 4160 */
1da177e4 LT	391	PTR sys_sched_getscheduler
	392	PTR sys_sched_yield
	393	PTR sys_sched_get_priority_max
	394	PTR sys_sched_get_priority_min
aebb2afd	395	PTR compat_sys_sched_rr_get_interval /* 4165 */
1da177e4 LT	396	PTR compat_sys_nanosleep
	397	PTR sys_mremap
	398	PTR sys_accept
	399	PTR sys_bind
	400	PTR sys_connect /* 4170 */
	401	PTR sys_getpeername
	402	PTR sys_getsockname
51d53674	403	PTR compat_sys_getsockopt
1da177e4	404	PTR sys_listen
1dacc76d JB	405	PTR compat_sys_recv /* 4175 */
1dacc76d JB	406	PTR compat_sys_recvfrom
1da177e4 LT	407	PTR compat_sys_recvmsg
	408	PTR sys_send
	409	PTR compat_sys_sendmsg
	410	PTR sys_sendto /* 4180 */
	411	PTR compat_sys_setsockopt
	412	PTR sys_shutdown
	413	PTR sys_socket
	414	PTR sys_socketpair
	415	PTR sys_setresuid /* 4185 */
	416	PTR sys_getresuid
	417	PTR sys_ni_syscall /* was query_module */
	418	PTR sys_poll
f5b94099	419	PTR sys_ni_syscall /* was nfsservctl */
1da177e4 LT	420	PTR sys_setresgid /* 4190 */
	421	PTR sys_getresgid
	422	PTR sys_prctl
	423	PTR sys32_rt_sigreturn
aa584802	424	PTR compat_sys_rt_sigaction
aebb2afd	425	PTR compat_sys_rt_sigprocmask /* 4195 */
45cb66f7	426	PTR compat_sys_rt_sigpending
1da177e4	427	PTR compat_sys_rt_sigtimedwait
ea5d83db	428	PTR compat_sys_rt_sigqueueinfo
bde208d2	429	PTR compat_sys_rt_sigsuspend
dbda6ac0 RB	430	PTR sys_32_pread /* 4200 */
dbda6ac0 RB	431	PTR sys_32_pwrite
1da177e4 LT	432	PTR sys_chown
	433	PTR sys_getcwd
	434	PTR sys_capget
	435	PTR sys_capset /* 4205 */
ea536ad4	436	PTR compat_sys_sigaltstack
19f4fc3a	437	PTR compat_sys_sendfile
1da177e4 LT	438	PTR sys_ni_syscall
1da177e4 LT	439	PTR sys_ni_syscall
dbda6ac0 RB	440	PTR sys_mips_mmap2 /* 4210 */
	441	PTR sys_32_truncate64
	442	PTR sys_32_ftruncate64
1da177e4 LT	443	PTR sys_newstat
	444	PTR sys_newlstat
	445	PTR sys_newfstat /* 4215 */
	446	PTR sys_pivot_root
	447	PTR sys_mincore
	448	PTR sys_madvise
	449	PTR sys_getdents64
	450	PTR compat_sys_fcntl64 /* 4220 */
	451	PTR sys_ni_syscall
	452	PTR sys_gettid
	453	PTR sys32_readahead
	454	PTR sys_setxattr
	455	PTR sys_lsetxattr /* 4225 */
	456	PTR sys_fsetxattr
	457	PTR sys_getxattr
	458	PTR sys_lgetxattr
	459	PTR sys_fgetxattr
	460	PTR sys_listxattr /* 4230 */
	461	PTR sys_llistxattr
	462	PTR sys_flistxattr
	463	PTR sys_removexattr
	464	PTR sys_lremovexattr
	465	PTR sys_fremovexattr /* 4235 */
	466	PTR sys_tkill
	467	PTR sys_sendfile64
5e392b8d	468	PTR compat_sys_futex
1da177e4 LT	469	PTR compat_sys_sched_setaffinity
1da177e4 LT	470	PTR compat_sys_sched_getaffinity /* 4240 */
e2cc502c	471	PTR compat_sys_io_setup
1da177e4	472	PTR sys_io_destroy
e2cc502c MT	473	PTR compat_sys_io_getevents
e2cc502c MT	474	PTR compat_sys_io_submit
1da177e4 LT	475	PTR sys_io_cancel /* 4245 */
1da177e4 LT	476	PTR sys_exit_group
d5dc77bf	477	PTR compat_sys_lookup_dcookie
1da177e4 LT	478	PTR sys_epoll_create
	479	PTR sys_epoll_ctl
	480	PTR sys_epoll_wait /* 4250 */
	481	PTR sys_remap_file_pages
	482	PTR sys_set_tid_address
	483	PTR sys_restart_syscall
8676d2e0	484	PTR sys32_fadvise64_64
1da177e4 LT	485	PTR compat_sys_statfs64 /* 4255 */
1da177e4 LT	486	PTR compat_sys_fstatfs64
821d313c	487	PTR compat_sys_timer_create
1da177e4 LT	488	PTR compat_sys_timer_settime
	489	PTR compat_sys_timer_gettime
	490	PTR sys_timer_getoverrun /* 4260 */
	491	PTR sys_timer_delete
	492	PTR compat_sys_clock_settime
	493	PTR compat_sys_clock_gettime
	494	PTR compat_sys_clock_getres
	495	PTR compat_sys_clock_nanosleep /* 4265 */
	496	PTR sys_tgkill
	497	PTR compat_sys_utimes
1ff1ad6b HC	498	PTR compat_sys_mbind
	499	PTR compat_sys_get_mempolicy
	500	PTR compat_sys_set_mempolicy /* 4270 */
1da177e4 LT	501	PTR compat_sys_mq_open
	502	PTR sys_mq_unlink
	503	PTR compat_sys_mq_timedsend
	504	PTR compat_sys_mq_timedreceive
	505	PTR compat_sys_mq_notify /* 4275 */
	506	PTR compat_sys_mq_getsetattr
	507	PTR sys_ni_syscall /* sys_vserver */
1c37ea82	508	PTR compat_sys_waitid
1da177e4 LT	509	PTR sys_ni_syscall /* available, was setaltroot */
	510	PTR sys_add_key /* 4280 */
	511	PTR sys_request_key
	512	PTR sys_keyctl
3c37026d	513	PTR sys_set_thread_area
7db36c85 RB	514	PTR sys_inotify_init
	515	PTR sys_inotify_add_watch /* 4285 */
	516	PTR sys_inotify_rm_watch
1ff1ad6b	517	PTR compat_sys_migrate_pages
72bf8914 RB	518	PTR compat_sys_openat
	519	PTR sys_mkdirat
	520	PTR sys_mknodat /* 4290 */
	521	PTR sys_fchownat
	522	PTR compat_sys_futimesat
63415dbb	523	PTR sys_newfstatat
72bf8914 RB	524	PTR sys_unlinkat
	525	PTR sys_renameat /* 4295 */
	526	PTR sys_linkat
	527	PTR sys_symlinkat
	528	PTR sys_readlinkat
	529	PTR sys_fchmodat
	530	PTR sys_faccessat /* 4300 */
99d233fa	531	PTR compat_sys_pselect6
049a31af	532	PTR compat_sys_ppoll
72bf8914	533	PTR sys_unshare
f115da9c	534	PTR sys_splice
a8d587a7	535	PTR sys32_sync_file_range /* 4305 */
136d47d3	536	PTR sys_tee
8d13cb26	537	PTR compat_sys_vmsplice
722cfd90	538	PTR compat_sys_move_pages
7fdeb048 AN	539	PTR compat_sys_set_robust_list
7fdeb048 AN	540	PTR compat_sys_get_robust_list /* 4310 */
583bb86f	541	PTR compat_sys_kexec_load
991ea26d	542	PTR sys_getcpu
e016c38d	543	PTR compat_sys_epoll_pwait
08253b39 RB	544	PTR sys_ioprio_set
08253b39 RB	545	PTR sys_ioprio_get /* 4315 */
7a6d4f38 AN	546	PTR compat_sys_utimensat
7a6d4f38 AN	547	PTR compat_sys_signalfd
8bdd5142	548	PTR sys_ni_syscall /* was timerfd */
7a6d4f38	549	PTR sys_eventfd
422efb17	550	PTR sys32_fallocate /* 4320 */
6783fe62	551	PTR sys_timerfd_create
c7d16736 DD	552	PTR compat_sys_timerfd_gettime
c7d16736 DD	553	PTR compat_sys_timerfd_settime
3885b71b RB	554	PTR compat_sys_signalfd4
	555	PTR sys_eventfd2 /* 4325 */
	556	PTR sys_epoll_create1
	557	PTR sys_dup3
	558	PTR sys_pipe2
	559	PTR sys_inotify_init1
ddd9e91b RB	560	PTR compat_sys_preadv /* 4330 */
ddd9e91b RB	561	PTR compat_sys_pwritev
69f16c9a	562	PTR compat_sys_rt_tgsigqueueinfo
cdd6c482	563	PTR sys_perf_event_open
54822de7	564	PTR sys_accept4
5e844b31 DD	565	PTR compat_sys_recvmmsg /* 4335 */
5e844b31 DD	566	PTR sys_fanotify_init
91c2e0bc	567	PTR compat_sys_fanotify_mark
5e844b31	568	PTR sys_prlimit64
84ed9432 DD	569	PTR sys_name_to_handle_at
	570	PTR compat_sys_open_by_handle_at /* 4340 */
	571	PTR compat_sys_clock_adjtime
1bbf2875	572	PTR sys_syncfs
b12acf16	573	PTR compat_sys_sendmmsg
7b21fddd	574	PTR sys_setns
8ff8584e DD	575	PTR compat_sys_process_vm_readv /* 4345 */
8ff8584e DD	576	PTR compat_sys_process_vm_writev
ce71d24c	577	PTR sys_kcmp
6295150b	578	PTR sys_finit_module
6776254b JH	579	PTR sys_sched_setattr
6776254b JH	580	PTR sys_sched_getattr /* 4350 */
367f0b50	581	PTR sys_renameat2
8855d608	582	PTR sys_seccomp
42944521 RB	583	PTR sys_getrandom
42944521 RB	584	PTR sys_memfd_create
5df4c8db	585	PTR sys_bpf /* 4355 */
389cdc5d	586	PTR compat_sys_execveat
96fc7a9c RB	587	PTR sys_userfaultfd
96fc7a9c RB	588	PTR sys_membarrier
2a9c2751	589	.size sys32_call_table,.-sys32_call_table