entry.s

linux-2.4.29操作系统的源码

	rfi
END(ia64_leave_kernel)

ENTRY(handle_syscall_error)
	/*
	 * Some system calls (e.g., ptrace, mmap) can return arbitrary
	 * values which could lead us to mistake a negative return
	 * value as a failed syscall.  Those syscall must deposit
	 * a non-zero value in pt_regs.r8 to indicate an error.
	 * If pt_regs.r8 is zero, we assume that the call completed
	 * successfully.
	 */
	PT_REGS_UNWIND_INFO(0)
	ld8 r3=[r2]		// load pt_regs.r8
	sub r9=0,r8		// negate return value to get errno
	;;
	mov r10=-1		// return -1 in pt_regs.r10 to indicate error
	cmp.eq p6,p7=r3,r0	// is pt_regs.r8==0?
	adds r3=16,r2		// r3=&pt_regs.r10
	;;
(p6)	mov r9=r8
(p6)	mov r10=0
	;;
.mem.offset 0,0; st8.spill [r2]=r9	// store errno in pt_regs.r8 and set unat bit
.mem.offset 8,0; st8.spill [r3]=r10	// store error indication in pt_regs.r10 and set unat bit
	br.cond.sptk ia64_leave_syscall
END(handle_syscall_error)

	/*
	 * Invoke schedule_tail(task) while preserving in0-in7, which may be needed
	 * in case a system call gets restarted.
	 */
GLOBAL_ENTRY(ia64_invoke_schedule_tail)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
	alloc loc1=ar.pfs,8,2,1,0
	mov loc0=rp
	mov out0=r8				// Address of previous task
	;;
	br.call.sptk.many rp=schedule_tail
.ret11:	mov ar.pfs=loc1
	mov rp=loc0
	br.ret.sptk.many rp
END(ia64_invoke_schedule_tail)

#if __GNUC__ < 3

	/*
	 * Invoke schedule() while preserving in0-in7, which may be needed
	 * in case a system call gets restarted.  Note that declaring schedule()
	 * with asmlinkage() is NOT enough because that will only preserve as many
	 * registers as there are formal arguments.
	 *
	 * XXX fix me: with gcc 3.0, we won't need this anymore because syscall_linkage
	 *	renders all eight input registers (in0-in7) as "untouchable".
	 */
ENTRY(invoke_schedule)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
	alloc loc1=ar.pfs,8,2,0,0
	mov loc0=rp
	;;
	.body
	br.call.sptk.many rp=schedule
.ret14:	mov ar.pfs=loc1
	mov rp=loc0
	br.ret.sptk.many rp
END(invoke_schedule)

#endif /* __GNUC__ < 3 */

	/*
	 * Setup stack and call ia64_do_signal.  Note that pSys and pNonSys need to
	 * be set up by the caller.  We declare 8 input registers so the system call
	 * args get preserved, in case we need to restart a system call.
	 */
ENTRY(handle_signal_delivery)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
	alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
	mov r9=ar.unat
	mov loc0=rp				// save return address
	mov out0=0				// there is no "oldset"
	adds out1=8,sp				// out1=&sigscratch->ar_pfs
(pSys)	mov out2=1				// out2==1 => we're in a syscall
	;;
(pNonSys) mov out2=0				// out2==0 => not a syscall
	.fframe 16
	.spillpsp ar.unat, 16			// (note that offset is relative to psp+0x10!)
	st8 [sp]=r9,-16				// allocate space for ar.unat and save it
	st8 [out1]=loc1,-8			// save ar.pfs, out1=&sigscratch
	.body
	br.call.sptk.many rp=ia64_do_signal
.ret15:	.restore sp
	adds sp=16,sp				// pop scratch stack space
	;;
	ld8 r9=[sp]				// load new unat from sw->caller_unat
	mov rp=loc0
	;;
	mov ar.unat=r9
	mov ar.pfs=loc1
	br.ret.sptk.many rp
END(handle_signal_delivery)

GLOBAL_ENTRY(sys_rt_sigsuspend)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
	alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
	mov r9=ar.unat
	mov loc0=rp				// save return address
	mov out0=in0				// mask
	mov out1=in1				// sigsetsize
	adds out2=8,sp				// out2=&sigscratch->ar_pfs
	;;
	.fframe 16
	.spillpsp ar.unat, 16			// (note that offset is relative to psp+0x10!)
	st8 [sp]=r9,-16				// allocate space for ar.unat and save it
	st8 [out2]=loc1,-8			// save ar.pfs, out2=&sigscratch
	.body
	br.call.sptk.many rp=ia64_rt_sigsuspend
.ret17:	.restore sp
	adds sp=16,sp				// pop scratch stack space
	;;
	ld8 r9=[sp]				// load new unat from sw->caller_unat
	mov rp=loc0
	;;
	mov ar.unat=r9
	mov ar.pfs=loc1
	br.ret.sptk.many rp
END(sys_rt_sigsuspend)

ENTRY(sys_rt_sigreturn)
	PT_REGS_UNWIND_INFO(0)
	alloc r2=ar.pfs,0,0,1,0
	.prologue
	PT_REGS_SAVES(16)
	adds sp=-16,sp
	.body
	cmp.eq pNonSys,pSys=r0,r0		// sigreturn isn't a normal syscall...
	;;
	/* After signal handler, live registers f6-f11 are restored to the previous
	 * executing context values for synchronized signals(from exceptions); or they 
	 * are cleared to 0 for asynchronized signals(from syscalls). These live registers 
	 * will be put into pt_regs to return back to user space.
	 */
	adds r16=PT(F6)+32,sp
	adds r17=PT(F7)+32,sp
	;;
 	stf.spill [r16]=f6,32	
 	stf.spill [r17]=f7,32	
	;;
 	stf.spill [r16]=f8,32	
 	stf.spill [r17]=f9,32	
	;;
 	stf.spill [r16]=f10	
 	stf.spill [r17]=f11	
	adds out0=16,sp				// out0 = &sigscratch
	br.call.sptk.many rp=ia64_rt_sigreturn
.ret19:	.restore sp 0
	adds sp=16,sp
	;;
	ld8 r9=[sp]				// load new ar.unat
	mov.sptk b7=r8,ia64_leave_kernel
	;;
	mov ar.unat=r9
	br.many b7
END(sys_rt_sigreturn)

GLOBAL_ENTRY(ia64_prepare_handle_unaligned)
	.prologue
	/*
	 * r16 = fake ar.pfs, we simply need to make sure privilege is still 0
	 */
	mov r16=r0
	DO_SAVE_SWITCH_STACK
	br.call.sptk.many rp=ia64_handle_unaligned	// stack frame setup in ivt
.ret21:	.body
	DO_LOAD_SWITCH_STACK
	br.cond.sptk.many rp				// goes to ia64_leave_kernel
END(ia64_prepare_handle_unaligned)

	//
	// unw_init_running(void (*callback)(info, arg), void *arg)
	//
#	define EXTRA_FRAME_SIZE	((UNW_FRAME_INFO_SIZE+15)&~15)

GLOBAL_ENTRY(unw_init_running)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
	alloc loc1=ar.pfs,2,3,3,0
	;;
	ld8 loc2=[in0],8
	mov loc0=rp
	mov r16=loc1
	DO_SAVE_SWITCH_STACK
	.body

	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
	.fframe IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE
	SWITCH_STACK_SAVES(EXTRA_FRAME_SIZE)
	adds sp=-EXTRA_FRAME_SIZE,sp
	.body
	;;
	adds out0=16,sp				// &info
	mov out1=r13				// current
	adds out2=16+EXTRA_FRAME_SIZE,sp	// &switch_stack
	br.call.sptk.many rp=unw_init_frame_info
1:	adds out0=16,sp				// &info
	mov b6=loc2
	mov loc2=gp				// save gp across indirect function call
	;;
	ld8 gp=[in0]
	mov out1=in1				// arg
	br.call.sptk.many rp=b6			// invoke the callback function
1:	mov gp=loc2				// restore gp

	// For now, we don't allow changing registers from within
	// unw_init_running; if we ever want to allow that, we'd
	// have to do a load_switch_stack here:
	.restore sp
	adds sp=IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE,sp

	mov ar.pfs=loc1
	mov rp=loc0
	br.ret.sptk.many rp
END(unw_init_running)

	.rodata
	.align 8
	.globl sys_call_table
sys_call_table:
	data8 sys_ni_syscall		//  This must be sys_ni_syscall!  See ivt.S.
	data8 sys_exit				// 1025
	data8 sys_read
	data8 sys_write
	data8 sys_open
	data8 sys_close
	data8 sys_creat				// 1030
	data8 sys_link
	data8 sys_unlink
	data8 ia64_execve
	data8 sys_chdir
	data8 sys_fchdir			// 1035
	data8 sys_utimes
	data8 sys_mknod
	data8 sys_chmod
	data8 sys_chown
	data8 sys_lseek				// 1040
	data8 sys_getpid
	data8 sys_getppid
	data8 sys_mount
	data8 sys_umount
	data8 sys_setuid			// 1045
	data8 sys_getuid
	data8 sys_geteuid
	data8 sys_ptrace
	data8 sys_access
	data8 sys_sync				// 1050
	data8 sys_fsync
	data8 sys_fdatasync
	data8 sys_kill
	data8 sys_rename
	data8 sys_mkdir				// 1055
	data8 sys_rmdir
	data8 sys_dup
	data8 sys_pipe
	data8 sys_times
	data8 ia64_brk				// 1060
	data8 sys_setgid
	data8 sys_getgid
	data8 sys_getegid
	data8 sys_acct
	data8 sys_ioctl				// 1065
	data8 sys_fcntl
	data8 sys_umask
	data8 sys_chroot
	data8 sys_ustat
	data8 sys_dup2				// 1070
	data8 sys_setreuid
	data8 sys_setregid
	data8 sys_getresuid
	data8 sys_setresuid
	data8 sys_getresgid			// 1075
	data8 sys_setresgid
	data8 sys_getgroups
	data8 sys_setgroups
	data8 sys_getpgid
	data8 sys_setpgid			// 1080
	data8 sys_setsid
	data8 sys_getsid
	data8 sys_sethostname
	data8 sys_setrlimit
	data8 sys_getrlimit			// 1085
	data8 sys_getrusage
	data8 sys_gettimeofday
	data8 sys_settimeofday
	data8 sys_select
	data8 sys_poll				// 1090
	data8 sys_symlink
	data8 sys_readlink
	data8 sys_uselib
	data8 sys_swapon
	data8 sys_swapoff			// 1095
	data8 sys_reboot
	data8 sys_truncate
	data8 sys_ftruncate
	data8 sys_fchmod
	data8 sys_fchown			// 1100
	data8 ia64_getpriority
	data8 sys_setpriority
	data8 sys_statfs
	data8 sys_fstatfs
	data8 sys_gettid			// 1105
	data8 sys_semget
	data8 sys_semop
	data8 sys_semctl
	data8 sys_msgget
	data8 sys_msgsnd			// 1110
	data8 sys_msgrcv
	data8 sys_msgctl
	data8 sys_shmget
	data8 ia64_shmat
	data8 sys_shmdt				// 1115
	data8 sys_shmctl
	data8 sys_syslog
	data8 sys_setitimer
	data8 sys_getitimer
	data8 ia64_oldstat			// 1120
	data8 ia64_oldlstat
	data8 ia64_oldfstat
	data8 sys_vhangup
	data8 sys_lchown
	data8 sys_vm86				// 1125
	data8 sys_wait4
	data8 sys_sysinfo
	data8 sys_clone
	data8 sys_setdomainname
	data8 sys_newuname			// 1130
	data8 sys_adjtimex
	data8 ia64_create_module
	data8 sys_init_module
	data8 sys_delete_module
	data8 sys_get_kernel_syms		// 1135
	data8 sys_query_module
	data8 sys_quotactl
	data8 sys_bdflush
	data8 sys_sysfs
	data8 sys_personality			// 1140
	data8 ia64_ni_syscall		// sys_afs_syscall
	data8 sys_setfsuid
	data8 sys_setfsgid
	data8 sys_getdents
	data8 sys_flock				// 1145
	data8 sys_readv
	data8 sys_writev
	data8 sys_pread
	data8 sys_pwrite
	data8 sys_sysctl			// 1150
	data8 sys_mmap
	data8 sys_munmap
	data8 sys_mlock
	data8 sys_mlockall
	data8 sys_mprotect			// 1155
	data8 ia64_mremap
	data8 sys_msync
	data8 sys_munlock
	data8 sys_munlockall
	data8 sys_sched_getparam		// 1160
	data8 sys_sched_setparam
	data8 sys_sched_getscheduler
	data8 sys_sched_setscheduler
	data8 sys_sched_yield
	data8 sys_sched_get_priority_max	// 1165
	data8 sys_sched_get_priority_min
	data8 sys_sched_rr_get_interval
	data8 sys_nanosleep
	data8 sys_nfsservctl
	data8 sys_prctl				// 1170
	data8 sys_getpagesize
	data8 sys_mmap2
	data8 sys_pciconfig_read
	data8 sys_pciconfig_write
	data8 sys_perfmonctl			// 1175
	data8 sys_sigaltstack
	data8 sys_rt_sigaction
	data8 sys_rt_sigpending
	data8 sys_rt_sigprocmask
	data8 sys_rt_sigqueueinfo		// 1180
	data8 sys_rt_sigreturn
	data8 sys_rt_sigsuspend
	data8 sys_rt_sigtimedwait
	data8 sys_getcwd
	data8 sys_capget			// 1185
	data8 sys_capset
	data8 sys_sendfile
	data8 sys_ni_syscall		// sys_getpmsg (STREAMS)
	data8 sys_ni_syscall		// sys_putpmsg (STREAMS)
	data8 sys_socket			// 1190
	data8 sys_bind
	data8 sys_connect
	data8 sys_listen
	data8 sys_accept
	data8 sys_getsockname			// 1195
	data8 sys_getpeername
	data8 sys_socketpair
	data8 sys_send
	data8 sys_sendto
	data8 sys_recv				// 1200
	data8 sys_recvfrom
	data8 sys_shutdown
	data8 sys_setsockopt
	data8 sys_getsockopt
	data8 sys_sendmsg			// 1205
	data8 sys_recvmsg
	data8 sys_pivot_root
	data8 sys_mincore
	data8 sys_madvise
	data8 sys_newstat			// 1210
	data8 sys_newlstat
	data8 sys_newfstat
	data8 sys_clone2
	data8 sys_getdents64
	data8 sys_getunwind			// 1215
	data8 sys_readahead
	data8 sys_setxattr
	data8 sys_lsetxattr
	data8 sys_fsetxattr
	data8 sys_getxattr			// 1220
	data8 sys_lgetxattr
	data8 sys_fgetxattr
	data8 sys_listxattr
	data8 sys_llistxattr
	data8 sys_flistxattr			// 1225
	data8 sys_removexattr
	data8 sys_lremovexattr
	data8 sys_fremovexattr
	data8 sys_tkill
	data8 ia64_ni_syscall			// 1230
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1235
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1240
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1245
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1250
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1255
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1260
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1265
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1270
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall			// 1275
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall
	data8 ia64_ni_syscall