entry.s

arm平台上的uclinux系统全部源代码

	movel	%sp,%sp@-
	movel	#71,%sp@- 		|  put vector # on stack (was %d0)
	jbsr	SYMBOL_NAME(process_int)|  process the IRQ
	addql	#8,%sp			|  pop parameters off stack
	bra	ret_from_interrupt	| this was fallthrough

/*
** This is the main interrupt handler, responsible for calling process_int()
*/
SYMBOL_NAME_LABEL(inthandler8)
	SAVE_ALL
	oriw #0x700,%sr

	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	addql	#1,SYMBOL_NAME(intr_count)
					|  put exception # in d0
	|movel	%sp@(LFORMATVEC),%d0
	|lsr	#4,%d0
	movew %sp@(LFORMATVEC),%d0
	and	#0x3ff,%d0
	| bfextu %sp@(LFORMATVEC){#4,#10},%d0

	movel	%sp,%sp@-
	movel	#72,%sp@- 		|  put vector # on stack (was %d0)
	jbsr	SYMBOL_NAME(process_int)|  process the IRQ
	addql	#8,%sp			|  pop parameters off stack
	bra	ret_from_interrupt	| this was fallthrough

/*
** This is the main interrupt handler, responsible for calling process_int()
*/
SYMBOL_NAME_LABEL(inthandler_wrap)
	SAVE_ALL
	oriw #0x700,%sr

	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	addql	#1,SYMBOL_NAME(intr_count)
					|  put exception # in d0
	|movel	%sp@(LFORMATVEC),%d0
	|lsr	#4,%d0

	movew %sp@(LFORMATVEC),%d0
	lsrl	#2, %d0
	andl	#0x3ff,%d0
	
	|| bfextu %sp@(LFORMATVEC){#4,#10},%d0

	movel	%sp,%sp@-
	movel	%d0 /*#31*/ ,%sp@- 		|  put vector # on stack
	jbsr	SYMBOL_NAME(process_int)|  process the IRQ
	addql	#8,%sp			|  pop parameters off stack
	bra	ret_from_interrupt	| this was fallthrough


/*
** This is the main interrupt handler, responsible for calling process_int()
*/
SYMBOL_NAME_LABEL(inthandler)
	SAVE_ALL
	oriw #0x700,%sr

	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	addql	#1,SYMBOL_NAME(intr_count)
					|  put exception # in d0
	|movel	%sp@(LFORMATVEC),%d0
	|lsr	#4,%d0

	movew %sp@(LFORMATVEC),%d0
	lsrl	#2, %d0
	andl	#0x3ff,%d0
	
	|| bfextu %sp@(LFORMATVEC){#4,#10},%d0

	movel	%sp,%sp@-
	movel	%d0,%sp@- 		|  put vector # on stack
	jbsr	SYMBOL_NAME(process_int)|  process the IRQ
	addql	#8,%sp			|  pop parameters off stack

SYMBOL_NAME_LABEL(ret_from_interrupt)
	/* check if we need to do software interrupts */
1:
	movel	SYMBOL_NAME(intr_count),%d1
	subql	#1,%d1
	jne	4f

	|movel	%sp@(LSR),%d0
	|lsr	#5,%d0
	moveb	%sp@(LSR),%d0
	and	#0x7,%d0
	|bfextu  %sp@(LSR){#5,#3},%d0    | Check for nested interrupt.
#if MAX_NOINT_IPL > 0
	cmpiw	#MAX_NOINT_IPL,%d0
#endif
	jhi	4f


2:
	movel	SYMBOL_NAME(bh_active),%d0
	andl	SYMBOL_NAME(bh_mask),%d0
	jne	3f

	clrl	SYMBOL_NAME(intr_count)	| deliver signals, reschedule etc..
	jra	SYMBOL_NAME(ret_from_exception)
3:	
	jbsr	SYMBOL_NAME(do_bottom_half)
	jbra	2b
4:
	movel	%d1,SYMBOL_NAME(intr_count)
	RESTORE_ALL


/* Handler for uninitialized and spurious interrupts */

SYMBOL_NAME_LABEL(bad_interrupt)
	addql	#1,SYMBOL_NAME(num_spurious)
	rte

ENTRY(sys_fork)
	SAVE_SWITCH_STACK
	pea	%sp@(SWITCH_STACK_SIZE)
	jbsr	SYMBOL_NAME(m68k_fork)
	addql	#4,%sp
	RESTORE_SWITCH_STACK
	rts

ENTRY(sys_clone)
	SAVE_SWITCH_STACK
	pea	%sp@(SWITCH_STACK_SIZE)
	jbsr	SYMBOL_NAME(m68k_clone)
	addql	#4,%sp
	RESTORE_SWITCH_STACK
	rts

ENTRY(sys_sigsuspend)
	SAVE_SWITCH_STACK
	pea	%sp@(SWITCH_STACK_SIZE)
	jbsr	SYMBOL_NAME(do_sigsuspend)
	addql	#4,%sp
	RESTORE_SWITCH_STACK
	rts

ENTRY(sys_sigreturn)
	SAVE_SWITCH_STACK
	jbsr	SYMBOL_NAME(do_sigreturn)
	RESTORE_SWITCH_STACK
	rts

LFLUSH_I_AND_D = 0x00000808
LTSS_KSP	= 0
LTSS_USP	= 4
LTSS_SR		= 8
LTSS_FS		= 10
LTSS_CRP	= 12
LTSS_FPCTXT	= 24

SYMBOL_NAME_LABEL(resume)
	/*
	 * Beware - when entering resume, offset of tss is in d1,
	 * prev (the current task) is in a0, next (the new task)
	 * is in a1 and d2.b is non-zero if the mm structure is
	 * shared between the tasks, so don't change these
	 * registers until their contents are no longer needed.
	 */

	/* offset of tss struct (processor state) from beginning
	   of task struct */
	addl	%d1,%a0

	/* save sr */
	movew	%sr,%a0@(LTSS_SR)

	/* disable interrupts */
	oriw	#0x0700,%sr

#ifndef NO_MM
	/* save fs (sfc,%dfc) (may be pointing to kernel memory) */
	movec	%sfc,%d0
	movew	%d0,%a0@(LTSS_FS)
#endif

	/* save usp */
	/* it is better to use a movel here instead of a movew 8*) */
	

	/* save non-scratch registers on stack */
	SAVE_SWITCH_STACK

	movel	%usp,%a2 /* usp */
	movel	%a2,%a0@(LTSS_USP)
#if 0
	/* busted */
	movel	%usp,%d0 /* usp */
	movel	%d0,%a0@(LTSS_USP)
#endif

	/* save current kernel stack pointer */
	movel	%sp,%a0@(LTSS_KSP)

	/* get pointer to tss struct (a1 contains new task) */
	movel	%a1,SYMBOL_NAME(current_set)
	addl	%d1,%a1

	/* Skip address space switching if they are the same. */
	/* FIXME: what did we hack out of here, this does nothing! */
#if 0
	tstb	%d2
	jne	4f
#endif
2:
4:
	/* restore floating point context */

	/* restore the kernel stack pointer */
	movel	%a1@(LTSS_KSP),%sp

	/* restore non-scratch registers */
	RESTORE_SWITCH_STACK

	/* restore user stack pointer */
	movel	%a1@(LTSS_USP),%a0
	movel	%a0,%usp

#ifndef NO_MM
	/* restore fs (sfc,%dfc) */
	movew	%a1@(LTSS_FS),%a0
	movec	%a0,%sfc
	movec	%a0,%dfc
#endif

	/* restore status register */
	movew	%a1@(LTSS_SR),%sr

	rts

.text
ALIGN
SYMBOL_NAME_LABEL(sys_call_table)
	.long SYMBOL_NAME(sys_setup)		/* 0 */
	.long SYMBOL_NAME(sys_exit)
	.long SYMBOL_NAME(sys_fork)
	.long SYMBOL_NAME(sys_read)
	.long SYMBOL_NAME(sys_write)
	.long SYMBOL_NAME(sys_open)		/* 5 */
	.long SYMBOL_NAME(sys_close)
	.long SYMBOL_NAME(sys_waitpid)
	.long SYMBOL_NAME(sys_creat)
	.long SYMBOL_NAME(sys_link)
	.long SYMBOL_NAME(sys_unlink)		/* 10 */
	.long SYMBOL_NAME(sys_execve)
	.long SYMBOL_NAME(sys_chdir)
	.long SYMBOL_NAME(sys_time)
	.long SYMBOL_NAME(sys_mknod)
	.long SYMBOL_NAME(sys_chmod)		/* 15 */
	.long SYMBOL_NAME(sys_chown)
	.long SYMBOL_NAME(sys_break)
	.long SYMBOL_NAME(sys_stat)
	.long SYMBOL_NAME(sys_lseek)
	.long SYMBOL_NAME(sys_getpid)		/* 20 */
	.long SYMBOL_NAME(sys_mount)
	.long SYMBOL_NAME(sys_umount)
	.long SYMBOL_NAME(sys_setuid)
	.long SYMBOL_NAME(sys_getuid)
	.long SYMBOL_NAME(sys_stime)		/* 25 */
	.long SYMBOL_NAME(sys_ptrace)
	.long SYMBOL_NAME(sys_alarm)
	.long SYMBOL_NAME(sys_fstat)
	.long SYMBOL_NAME(sys_pause)
	.long SYMBOL_NAME(sys_utime)		/* 30 */
	.long SYMBOL_NAME(sys_stty)
	.long SYMBOL_NAME(sys_gtty)
	.long SYMBOL_NAME(sys_access)
	.long SYMBOL_NAME(sys_nice)
	.long SYMBOL_NAME(sys_ftime)		/* 35 */
	.long SYMBOL_NAME(sys_sync)
	.long SYMBOL_NAME(sys_kill)
	.long SYMBOL_NAME(sys_rename)
	.long SYMBOL_NAME(sys_mkdir)
	.long SYMBOL_NAME(sys_rmdir)		/* 40 */
	.long SYMBOL_NAME(sys_dup)
	.long SYMBOL_NAME(sys_pipe)
	.long SYMBOL_NAME(sys_times)
	.long SYMBOL_NAME(sys_prof)
	.long SYMBOL_NAME(sys_brk)		/* 45 */
	.long SYMBOL_NAME(sys_setgid)
	.long SYMBOL_NAME(sys_getgid)
	.long SYMBOL_NAME(sys_signal)
	.long SYMBOL_NAME(sys_geteuid)
	.long SYMBOL_NAME(sys_getegid)		/* 50 */
	.long SYMBOL_NAME(sys_acct)
	.long SYMBOL_NAME(sys_phys)
	.long SYMBOL_NAME(sys_lock)
	.long SYMBOL_NAME(sys_ioctl)
	.long SYMBOL_NAME(sys_fcntl)		/* 55 */
	.long SYMBOL_NAME(sys_mpx)
	.long SYMBOL_NAME(sys_setpgid)
	.long SYMBOL_NAME(sys_ulimit)
	.long SYMBOL_NAME(sys_olduname)
	.long SYMBOL_NAME(sys_umask)		/* 60 */
	.long SYMBOL_NAME(sys_chroot)
	.long SYMBOL_NAME(sys_ustat)
	.long SYMBOL_NAME(sys_dup2)
	.long SYMBOL_NAME(sys_getppid)
	.long SYMBOL_NAME(sys_getpgrp)		/* 65 */
	.long SYMBOL_NAME(sys_setsid)
	.long SYMBOL_NAME(sys_sigaction)
	.long SYMBOL_NAME(sys_sgetmask)
	.long SYMBOL_NAME(sys_ssetmask)
	.long SYMBOL_NAME(sys_setreuid)		/* 70 */
	.long SYMBOL_NAME(sys_setregid)
	.long SYMBOL_NAME(sys_sigsuspend)
	.long SYMBOL_NAME(sys_sigpending)
	.long SYMBOL_NAME(sys_sethostname)
	.long SYMBOL_NAME(sys_setrlimit)	/* 75 */
	.long SYMBOL_NAME(sys_getrlimit)
	.long SYMBOL_NAME(sys_getrusage)
	.long SYMBOL_NAME(sys_gettimeofday)
	.long SYMBOL_NAME(sys_settimeofday)
	.long SYMBOL_NAME(sys_getgroups)	/* 80 */
	.long SYMBOL_NAME(sys_setgroups)
	.long SYMBOL_NAME(old_select)
	.long SYMBOL_NAME(sys_symlink)
	.long SYMBOL_NAME(sys_lstat)
	.long SYMBOL_NAME(sys_readlink)		/* 85 */
	.long SYMBOL_NAME(sys_uselib)
	.long SYMBOL_NAME(sys_swapon)
	.long SYMBOL_NAME(sys_reboot)
	.long SYMBOL_NAME(old_readdir)
	.long SYMBOL_NAME(old_mmap)		/* 90 */
	.long SYMBOL_NAME(sys_munmap)
	.long SYMBOL_NAME(sys_truncate)
	.long SYMBOL_NAME(sys_ftruncate)
	.long SYMBOL_NAME(sys_fchmod)
	.long SYMBOL_NAME(sys_fchown)		/* 95 */
	.long SYMBOL_NAME(sys_getpriority)
	.long SYMBOL_NAME(sys_setpriority)
	.long SYMBOL_NAME(sys_profil)
	.long SYMBOL_NAME(sys_statfs)
	.long SYMBOL_NAME(sys_fstatfs)		/* 100 */
	.long SYMBOL_NAME(sys_ioperm)
	.long SYMBOL_NAME(sys_socketcall)
	.long SYMBOL_NAME(sys_syslog)
	.long SYMBOL_NAME(sys_setitimer)
	.long SYMBOL_NAME(sys_getitimer)	/* 105 */
	.long SYMBOL_NAME(sys_newstat)
	.long SYMBOL_NAME(sys_newlstat)
	.long SYMBOL_NAME(sys_newfstat)
	.long SYMBOL_NAME(sys_uname)
	.long SYMBOL_NAME(sys_ni_syscall)	/* iopl for i386 */ /* 110 */
	.long SYMBOL_NAME(sys_vhangup)
	.long SYMBOL_NAME(sys_idle)
	.long SYMBOL_NAME(sys_ni_syscall)	/* vm86 for i386 */
	.long SYMBOL_NAME(sys_wait4)
	.long SYMBOL_NAME(sys_swapoff)		/* 115 */
	.long SYMBOL_NAME(sys_sysinfo)
	.long SYMBOL_NAME(sys_ipc)
	.long SYMBOL_NAME(sys_fsync)
	.long SYMBOL_NAME(sys_sigreturn)
	.long SYMBOL_NAME(sys_clone)		/* 120 */
	.long SYMBOL_NAME(sys_setdomainname)
	.long SYMBOL_NAME(sys_newuname)
	.long SYMBOL_NAME(sys_cacheflush)	/* modify_ldt for i386 */
	.long SYMBOL_NAME(sys_adjtimex)
	.long SYMBOL_NAME(sys_mprotect)		/* 125 */
	.long SYMBOL_NAME(sys_sigprocmask)
	.long SYMBOL_NAME(sys_create_module)
	.long SYMBOL_NAME(sys_init_module)
	.long SYMBOL_NAME(sys_delete_module)
	.long SYMBOL_NAME(sys_get_kernel_syms)	/* 130 */
	.long SYMBOL_NAME(sys_quotactl)
	.long SYMBOL_NAME(sys_getpgid)
	.long SYMBOL_NAME(sys_fchdir)
	.long SYMBOL_NAME(sys_bdflush)
	.long SYMBOL_NAME(sys_sysfs)		/* 135 */
	.long SYMBOL_NAME(sys_personality)
	.long SYMBOL_NAME(sys_ni_syscall)	/* for afs_syscall */
	.long SYMBOL_NAME(sys_setfsuid)
	.long SYMBOL_NAME(sys_setfsgid)
	.long SYMBOL_NAME(sys_llseek)		/* 140 */
	.long SYMBOL_NAME(sys_getdents)
	.long SYMBOL_NAME(sys_select)
	.long SYMBOL_NAME(sys_flock)
	.long SYMBOL_NAME(sys_msync)
	.long SYMBOL_NAME(sys_readv)		/* 145 */
	.long SYMBOL_NAME(sys_writev)
	.long SYMBOL_NAME(sys_getsid)
	.long SYMBOL_NAME(sys_fdatasync)
	.long SYMBOL_NAME(sys_sysctl)
	.long SYMBOL_NAME(sys_mlock)		/* 150 */
	.long SYMBOL_NAME(sys_munlock)
	.long SYMBOL_NAME(sys_mlockall)
	.long SYMBOL_NAME(sys_munlockall)
	.long SYMBOL_NAME(sys_sched_setparam)
	.long SYMBOL_NAME(sys_sched_getparam)   /* 155 */
	.long SYMBOL_NAME(sys_sched_setscheduler)
	.long SYMBOL_NAME(sys_sched_getscheduler)
	.long SYMBOL_NAME(sys_sched_yield)
	.long SYMBOL_NAME(sys_sched_get_priority_max)
	.long SYMBOL_NAME(sys_sched_get_priority_min)  /* 160 */
	.long SYMBOL_NAME(sys_sched_rr_get_interval)
	.long SYMBOL_NAME(sys_nanosleep)
	.long SYMBOL_NAME(sys_mremap)
	.space (NR_syscalls-163)*4