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/*
* 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
addiu t1, 4 # skip to next instruction
sw t1, PT_EPC(sp)
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
load_a4: user_lw(t5, 16(t0)) # argument #5 from usp
load_a5: user_lw(t6, 20(t0)) # argument #6 from usp
load_a6: user_lw(t7, 24(t0)) # argument #7 from usp
load_a7: user_lw(t8, 28(t0)) # argument #8 from usp
loads_done:
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 load_a4, bad_stack_a4
PTR load_a5, bad_stack_a5
PTR load_a6, bad_stack_a6
PTR load_a7, bad_stack_a7
.previous
lw t0, TI_FLAGS($28) # syscall tracing enabled?
li t1, _TIF_WORK_SYSCALL_ENTRY
and t0, t1
bnez t0, syscall_trace_entry # -> yes
syscall_common:
subu v0, v0, __NR_O32_Linux # check syscall number
sltiu t0, v0, __NR_O32_Linux_syscalls + 1
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
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 a0, sp
/*
* syscall number is in v0 unless we called syscall(__NR_###)
* where the real syscall number is in a0
*/
move a1, v0
subu t2, v0, __NR_O32_Linux
bnez t2, 1f /* __NR_syscall at offset 0 */
lw a1, PT_R4(sp)
1: jal syscall_trace_enter
bltz v0, 1f # seccomp failed? Skip syscall
RESTORE_STATIC
lw v0, PT_R2(sp) # Restore syscall (maybe modified)
lw a0, PT_R4(sp) # Restore argument registers
lw a1, PT_R5(sp)
lw a2, PT_R6(sp)
lw a3, PT_R7(sp)
j syscall_common
1: j syscall_exit
/* ------------------------------------------------------------------------ */
/*
* Our open-coded access area sanity test for the stack pointer
* failed. 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
bad_stack_a4:
li t5, 0
b load_a5
bad_stack_a5:
li t6, 0
b load_a6
bad_stack_a6:
li t7, 0
b load_a7
bad_stack_a7:
li t8, 0
b loads_done
/*
* 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
PTR sys_userfaultfd
PTR sys_membarrier
PTR sys_mlock2
PTR sys_copy_file_range /* 4360 */
PTR sys_preadv2
PTR sys_pwritev2
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