entry.s

linux 内核源代码

	stdi		gr30,@(gr28,#REG_CCR)
	movsg		lr  ,gr30
	movsg		lcr ,gr31
	stdi		gr30,@(gr28,#REG_LR)
	sti		gr0 ,@(gr28,#REG_SYSCALLNO)
	movsg		scr2,gr28
#endif

	rett		#0

	# return via break.S
__entry_return_singlestep:
	movgs		gr2,ccr
	lddi		@(gr28,#REG_GR(2)) ,gr2
	ldi		@(gr28,#REG_SP)    ,sp
	ldi		@(gr28,#REG_GR(28)),gr28
	LEDS		0x67ff
	break
	.globl		__entry_return_singlestep_breaks_here
__entry_return_singlestep_breaks_here:
	nop


###############################################################################
#
# return to a process interrupted in kernel space
# - we need to consider preemption if that is enabled
#
###############################################################################
	.balign		L1_CACHE_BYTES
__entry_return_from_kernel_exception:
	LEDS		0x6302
	movsg		psr,gr23
	ori		gr23,#PSR_PIL_14,gr23
	movgs		gr23,psr
	bra		__entry_return_direct

	.balign		L1_CACHE_BYTES
__entry_return_from_kernel_interrupt:
	LEDS		0x6303
	movsg		psr,gr23
	ori		gr23,#PSR_PIL_14,gr23
	movgs		gr23,psr

#ifdef CONFIG_PREEMPT
	ldi		@(gr15,#TI_PRE_COUNT),gr5
	subicc		gr5,#0,gr0,icc0
	beq		icc0,#0,__entry_return_direct

__entry_preempt_need_resched:
	ldi		@(gr15,#TI_FLAGS),gr4
	andicc		gr4,#_TIF_NEED_RESCHED,gr0,icc0
	beq		icc0,#1,__entry_return_direct

	setlos		#PREEMPT_ACTIVE,gr5
	sti		gr5,@(gr15,#TI_FLAGS)

	andi		gr23,#~PSR_PIL,gr23
	movgs		gr23,psr

	call		schedule
	sti		gr0,@(gr15,#TI_PRE_COUNT)

	movsg		psr,gr23
	ori		gr23,#PSR_PIL_14,gr23
	movgs		gr23,psr
	bra		__entry_preempt_need_resched
#else
	bra		__entry_return_direct
#endif


###############################################################################
#
# perform work that needs to be done immediately before resumption
#
###############################################################################
	.globl		__entry_return_from_user_exception
	.balign		L1_CACHE_BYTES
__entry_return_from_user_exception:
	LEDS		0x6501

__entry_resume_userspace:
	# make sure we don't miss an interrupt setting need_resched or sigpending between
	# sampling and the RETT
	movsg		psr,gr23
	ori		gr23,#PSR_PIL_14,gr23
	movgs		gr23,psr

__entry_return_from_user_interrupt:
	LEDS		0x6402
	ldi		@(gr15,#TI_FLAGS),gr4
	sethi.p		%hi(_TIF_WORK_MASK),gr5
	setlo		%lo(_TIF_WORK_MASK),gr5
	andcc		gr4,gr5,gr0,icc0
	beq		icc0,#1,__entry_return_direct

__entry_work_pending:
	LEDS		0x6404
	andicc		gr4,#_TIF_NEED_RESCHED,gr0,icc0
	beq		icc0,#1,__entry_work_notifysig

__entry_work_resched:
	LEDS		0x6408
	movsg		psr,gr23
	andi		gr23,#~PSR_PIL,gr23
	movgs		gr23,psr
	call		schedule
	movsg		psr,gr23
	ori		gr23,#PSR_PIL_14,gr23
	movgs		gr23,psr

	LEDS		0x6401
	ldi		@(gr15,#TI_FLAGS),gr4
	sethi.p		%hi(_TIF_WORK_MASK),gr5
	setlo		%lo(_TIF_WORK_MASK),gr5
	andcc		gr4,gr5,gr0,icc0
	beq		icc0,#1,__entry_return_direct
	andicc		gr4,#_TIF_NEED_RESCHED,gr0,icc0
	bne		icc0,#1,__entry_work_resched

__entry_work_notifysig:
	LEDS		0x6410
	ori.p		gr4,#0,gr8
	call		do_notify_resume
	bra		__entry_resume_userspace

	# perform syscall entry tracing
__syscall_trace_entry:
	LEDS		0x6320
	setlos.p	#0,gr8
	call		do_syscall_trace

	ldi		@(gr28,#REG_SYSCALLNO),gr7
	lddi		@(gr28,#REG_GR(8)) ,gr8
	lddi		@(gr28,#REG_GR(10)),gr10
	lddi.p		@(gr28,#REG_GR(12)),gr12

	subicc		gr7,#nr_syscalls,gr0,icc0
	bnc		icc0,#0,__syscall_badsys
	bra		__syscall_call

	# perform syscall exit tracing
__syscall_exit_work:
	LEDS		0x6340
	andicc		gr4,#_TIF_SYSCALL_TRACE,gr0,icc0
	beq		icc0,#1,__entry_work_pending

	movsg		psr,gr23
	andi		gr23,#~PSR_PIL,gr23	; could let do_syscall_trace() call schedule()
	movgs		gr23,psr

	setlos.p	#1,gr8
	call		do_syscall_trace
	bra		__entry_resume_userspace

__syscall_badsys:
	LEDS		0x6380
	setlos		#-ENOSYS,gr8
	sti		gr8,@(gr28,#REG_GR(8))	; save return value
	bra		__entry_resume_userspace


###############################################################################
#
# syscall vector table
#
###############################################################################
	.section .rodata
ALIGN
	.globl		sys_call_table
sys_call_table:
	.long sys_restart_syscall	/* 0 - old "setup()" system call, used for restarting */
	.long sys_exit
	.long sys_fork
	.long sys_read
	.long sys_write
	.long sys_open		/* 5 */
	.long sys_close
	.long sys_waitpid
	.long sys_creat
	.long sys_link
	.long sys_unlink		/* 10 */
	.long sys_execve
	.long sys_chdir
	.long sys_time
	.long sys_mknod
	.long sys_chmod		/* 15 */
	.long sys_lchown16
	.long sys_ni_syscall			/* old break syscall holder */
	.long sys_stat
	.long sys_lseek
	.long sys_getpid		/* 20 */
	.long sys_mount
	.long sys_oldumount
	.long sys_setuid16
	.long sys_getuid16
	.long sys_ni_syscall // sys_stime		/* 25 */
	.long sys_ptrace
	.long sys_alarm
	.long sys_fstat
	.long sys_pause
	.long sys_utime		/* 30 */
	.long sys_ni_syscall			/* old stty syscall holder */
	.long sys_ni_syscall			/* old gtty syscall holder */
	.long sys_access
	.long sys_nice
	.long sys_ni_syscall	/* 35 */	/* old ftime syscall holder */
	.long sys_sync
	.long sys_kill
	.long sys_rename
	.long sys_mkdir
	.long sys_rmdir		/* 40 */
	.long sys_dup
	.long sys_pipe
	.long sys_times
	.long sys_ni_syscall			/* old prof syscall holder */
	.long sys_brk		/* 45 */
	.long sys_setgid16
	.long sys_getgid16
	.long sys_ni_syscall // sys_signal
	.long sys_geteuid16
	.long sys_getegid16	/* 50 */
	.long sys_acct
	.long sys_umount				/* recycled never used phys( */
	.long sys_ni_syscall			/* old lock syscall holder */
	.long sys_ioctl
	.long sys_fcntl		/* 55 */
	.long sys_ni_syscall			/* old mpx syscall holder */
	.long sys_setpgid
	.long sys_ni_syscall			/* old ulimit syscall holder */
	.long sys_ni_syscall			/* old old uname syscall */
	.long sys_umask		/* 60 */
	.long sys_chroot
	.long sys_ustat
	.long sys_dup2
	.long sys_getppid
	.long sys_getpgrp	/* 65 */
	.long sys_setsid
	.long sys_sigaction
	.long sys_ni_syscall // sys_sgetmask
	.long sys_ni_syscall // sys_ssetmask
	.long sys_setreuid16	/* 70 */
	.long sys_setregid16
	.long sys_sigsuspend
	.long sys_ni_syscall // sys_sigpending
	.long sys_sethostname
	.long sys_setrlimit	/* 75 */
	.long sys_ni_syscall // sys_old_getrlimit
	.long sys_getrusage
	.long sys_gettimeofday
	.long sys_settimeofday
	.long sys_getgroups16	/* 80 */
	.long sys_setgroups16
	.long sys_ni_syscall			/* old_select slot */
	.long sys_symlink
	.long sys_lstat
	.long sys_readlink		/* 85 */
	.long sys_uselib
	.long sys_swapon
	.long sys_reboot
	.long sys_ni_syscall // old_readdir
	.long sys_ni_syscall	/* 90 */	/* old_mmap slot */
	.long sys_munmap
	.long sys_truncate
	.long sys_ftruncate
	.long sys_fchmod
	.long sys_fchown16		/* 95 */
	.long sys_getpriority
	.long sys_setpriority
	.long sys_ni_syscall			/* old profil syscall holder */
	.long sys_statfs
	.long sys_fstatfs		/* 100 */
	.long sys_ni_syscall			/* ioperm for i386 */
	.long sys_socketcall
	.long sys_syslog
	.long sys_setitimer
	.long sys_getitimer	/* 105 */
	.long sys_newstat
	.long sys_newlstat
	.long sys_newfstat
	.long sys_ni_syscall	/* obsolete olduname( syscall */
	.long sys_ni_syscall	/* iopl for i386 */ /* 110 */
	.long sys_vhangup
	.long sys_ni_syscall	/* obsolete idle( syscall */
	.long sys_ni_syscall	/* vm86old for i386 */
	.long sys_wait4
	.long sys_swapoff		/* 115 */
	.long sys_sysinfo
	.long sys_ipc
	.long sys_fsync
	.long sys_sigreturn
	.long sys_clone		/* 120 */
	.long sys_setdomainname
	.long sys_newuname
	.long sys_ni_syscall	/* old "cacheflush" */
	.long sys_adjtimex
	.long sys_mprotect	/* 125 */
	.long sys_sigprocmask
	.long sys_ni_syscall	/* old "create_module" */
	.long sys_init_module
	.long sys_delete_module
	.long sys_ni_syscall	/* old "get_kernel_syms" */
	.long sys_quotactl
	.long sys_getpgid
	.long sys_fchdir
	.long sys_bdflush
	.long sys_sysfs		/* 135 */
	.long sys_personality
	.long sys_ni_syscall	/* for afs_syscall */
	.long sys_setfsuid16
	.long sys_setfsgid16
	.long sys_llseek		/* 140 */
	.long sys_getdents
	.long sys_select
	.long sys_flock
	.long sys_msync
	.long sys_readv		/* 145 */
	.long sys_writev
	.long sys_getsid
	.long sys_fdatasync
	.long sys_sysctl
	.long sys_mlock		/* 150 */
	.long sys_munlock
	.long sys_mlockall
	.long sys_munlockall
	.long sys_sched_setparam
	.long sys_sched_getparam   /* 155 */
	.long sys_sched_setscheduler
	.long sys_sched_getscheduler
	.long sys_sched_yield
	.long sys_sched_get_priority_max
	.long sys_sched_get_priority_min  /* 160 */
	.long sys_sched_rr_get_interval
	.long sys_nanosleep
	.long sys_mremap
	.long sys_setresuid16
	.long sys_getresuid16	/* 165 */
	.long sys_ni_syscall	/* for vm86 */
	.long sys_ni_syscall	/* Old sys_query_module */
	.long sys_poll
	.long sys_nfsservctl
	.long sys_setresgid16	/* 170 */
	.long sys_getresgid16
	.long sys_prctl
	.long sys_rt_sigreturn
	.long sys_rt_sigaction
	.long sys_rt_sigprocmask	/* 175 */
	.long sys_rt_sigpending
	.long sys_rt_sigtimedwait
	.long sys_rt_sigqueueinfo
	.long sys_rt_sigsuspend
	.long sys_pread64		/* 180 */
	.long sys_pwrite64
	.long sys_chown16
	.long sys_getcwd
	.long sys_capget
	.long sys_capset           /* 185 */
	.long sys_sigaltstack
	.long sys_sendfile
	.long sys_ni_syscall		/* streams1 */
	.long sys_ni_syscall		/* streams2 */
	.long sys_vfork            /* 190 */
	.long sys_getrlimit
	.long sys_mmap2
	.long sys_truncate64
	.long sys_ftruncate64
	.long sys_stat64		/* 195 */
	.long sys_lstat64
	.long sys_fstat64
	.long sys_lchown
	.long sys_getuid
	.long sys_getgid		/* 200 */
	.long sys_geteuid
	.long sys_getegid
	.long sys_setreuid
	.long sys_setregid
	.long sys_getgroups	/* 205 */
	.long sys_setgroups
	.long sys_fchown
	.long sys_setresuid
	.long sys_getresuid
	.long sys_setresgid	/* 210 */
	.long sys_getresgid
	.long sys_chown
	.long sys_setuid
	.long sys_setgid
	.long sys_setfsuid		/* 215 */
	.long sys_setfsgid
	.long sys_pivot_root
	.long sys_mincore
	.long sys_madvise
	.long sys_getdents64	/* 220 */
	.long sys_fcntl64
	.long sys_ni_syscall	/* reserved for TUX */
	.long sys_ni_syscall	/* Reserved for Security */
	.long sys_gettid
	.long sys_readahead	/* 225 */
	.long sys_setxattr
	.long sys_lsetxattr
	.long sys_fsetxattr
	.long sys_getxattr
	.long sys_lgetxattr	/* 230 */
	.long sys_fgetxattr
	.long sys_listxattr
	.long sys_llistxattr
	.long sys_flistxattr
	.long sys_removexattr	/* 235 */
	.long sys_lremovexattr
	.long sys_fremovexattr
 	.long sys_tkill
	.long sys_sendfile64
	.long sys_futex		/* 240 */
	.long sys_sched_setaffinity
	.long sys_sched_getaffinity
	.long sys_ni_syscall	//sys_set_thread_area
	.long sys_ni_syscall	//sys_get_thread_area
	.long sys_io_setup	/* 245 */
	.long sys_io_destroy
	.long sys_io_getevents
	.long sys_io_submit
	.long sys_io_cancel
	.long sys_fadvise64	/* 250 */
	.long sys_ni_syscall
	.long sys_exit_group
	.long sys_lookup_dcookie
	.long sys_epoll_create
	.long sys_epoll_ctl	/* 255 */
	.long sys_epoll_wait
 	.long sys_remap_file_pages
 	.long sys_set_tid_address
 	.long sys_timer_create
 	.long sys_timer_settime		/* 260 */
 	.long sys_timer_gettime
 	.long sys_timer_getoverrun
 	.long sys_timer_delete
 	.long sys_clock_settime
 	.long sys_clock_gettime		/* 265 */
 	.long sys_clock_getres
 	.long sys_clock_nanosleep
	.long sys_statfs64
	.long sys_fstatfs64
	.long sys_tgkill	/* 270 */
	.long sys_utimes
 	.long sys_fadvise64_64
	.long sys_ni_syscall	/* sys_vserver */
	.long sys_mbind
	.long sys_get_mempolicy
	.long sys_set_mempolicy
	.long sys_mq_open
	.long sys_mq_unlink
	.long sys_mq_timedsend
	.long sys_mq_timedreceive	/* 280 */
	.long sys_mq_notify
	.long sys_mq_getsetattr
	.long sys_ni_syscall		/* reserved for kexec */
	.long sys_waitid
	.long sys_ni_syscall		/* 285 */ /* available */
	.long sys_add_key
	.long sys_request_key
	.long sys_keyctl
	.long sys_ioprio_set
	.long sys_ioprio_get		/* 290 */
	.long sys_inotify_init
	.long sys_inotify_add_watch
	.long sys_inotify_rm_watch
	.long sys_migrate_pages
	.long sys_openat		/* 295 */
	.long sys_mkdirat
	.long sys_mknodat
	.long sys_fchownat
	.long sys_futimesat
	.long sys_fstatat64		/* 300 */
	.long sys_unlinkat
	.long sys_renameat
	.long sys_linkat
	.long sys_symlinkat
	.long sys_readlinkat		/* 305 */
	.long sys_fchmodat
	.long sys_faccessat
	.long sys_pselect6
	.long sys_ppoll
	.long sys_unshare		/* 310 */
	.long sys_set_robust_list
	.long sys_get_robust_list
	.long sys_splice
	.long sys_sync_file_range
	.long sys_tee			/* 315 */
	.long sys_vmsplice
	.long sys_move_pages
	.long sys_getcpu
	.long sys_epoll_pwait
	.long sys_utimensat		/* 320 */
	.long sys_signalfd
	.long sys_timerfd
	.long sys_eventfd
	.long sys_fallocate


syscall_table_size = (. - sys_call_table)