entry.s

arm平台上的uclinux系统全部源代码

/* -*- mode: asm -*-
 *
 *  linux/arch/m68knommu/kernel/entry.S
 *
 *  Copyright (C) 1998  D. Jeff Dionne <[e-mail]>,
 *                      Kenneth Albanowski <[e-mail]>,
 *                      The Silver Hammer Group, Ltd.
 *
 * (The icky duplicate functions are my fault -- kja)
 *
 * Based on:
 *
 *  linux/arch/m68k/kernel/entry.S
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file README.legal in the main directory of this archive
 * for more details.
 *
 * Linux/m68k support by Hamish Macdonald
 *
 * 68060 fixes by Jesper Skov
 *
 */

/*
 * entry.S  contains the system-call and fault low-level handling routines.
 * This also contains the timer-interrupt handler, as well as all interrupts
 * and faults that can result in a task-switch.
 *
 * NOTE: This code handles signal-recognition, which happens every time
 * after a timer-interrupt and after each system call.
 *
 * Stack layout in 'ret_from_exception':
 *
 *	This allows access to the syscall arguments in registers d1-d5
 *
 *	 0(sp) - d1
 *	 4(sp) - d2
 *	 8(sp) - d3
 *	 C(sp) - d4
 *	10(sp) - d5
 *	14(sp) - a0
 *	18(sp) - a1
 *	1C(sp) - d0
 *	20(sp) - orig_d0
 *	24(sp) - stack adjustment
 *	28(sp) - sr
 *	2A(sp) - pc
 *	2E(sp) - format & vector
 */

/*
 * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
 *               all pointers that used to be 'current' are now entry
 *               number 0 in the 'current_set' list.
 */

#include <linux/sys.h>
#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/setup.h>
#include <asm/segment.h>

LENOSYS = 38

/*
 * these are offsets into the task-struct
 */
LTASK_STATE	=  0
LTASK_COUNTER	=  4
LTASK_PRIORITY	=  8
LTASK_SIGNAL	= 12
LTASK_BLOCKED	= 16
LTASK_FLAGS	= 20

/* the following macro is used when enabling interrupts */
#define ALLOWINT 0xf8ff
#define	MAX_NOINT_IPL	0

LD0		= 0x1C
LORIG_D0	= 0x20
LSR		= 0x28
LFORMATVEC	= 0x2E

/*
 * This defines the normal kernel pt-regs layout.
 *
 * regs are a2-a6 and d6-d7 preserved by C code
 * the kernel doesn't mess with usp unless it needs to
 */
#define SAVE_ALL			\
	clrl	%sp@-;    /* stk_adj */	\
	movel	%d0,%sp@-; /* orig d0 */	\
	movel	%d0,%sp@-; /* d0 */	\
	moveml	%d1-%d5/%a0-%a1,%sp@-

/*	moveml	%sp@+,%a0-%a1/%d1-%d5;	*/

#define RESTORE_ALL			\
	moveml	%sp@+,%d1-%d5/%a0-%a1;	\
	movel	%sp@+,%d0;		\
	addql	#4,%sp;	 /* orig d0 */	\
	addl	%sp@+,%sp; /* stk adj */	\
	rte

#define SWITCH_STACK_SIZE (7*4+4)	/* includes return address */

#define SAVE_SWITCH_STACK \
	moveml	%a2-%a6/%d6-%d7,%sp@-

#define RESTORE_SWITCH_STACK \
	moveml	%sp@+,%a2-%a6/%d6-%d7

.globl SYMBOL_NAME(system_call), SYMBOL_NAME(buserr), SYMBOL_NAME(trap)
.globl SYMBOL_NAME(resume), SYMBOL_NAME(ret_from_exception)
.globl SYMBOL_NAME(ret_from_signal)
.globl SYMBOL_NAME(trap3)
.globl SYMBOL_NAME(trap4)
.globl SYMBOL_NAME(trap5)
.globl SYMBOL_NAME(inthandler1)
.globl SYMBOL_NAME(inthandler1)
.globl SYMBOL_NAME(inthandler1)
.globl SYMBOL_NAME(inthandler2)
.globl SYMBOL_NAME(inthandler3)
.globl SYMBOL_NAME(inthandler4)
.globl SYMBOL_NAME(inthandler5)
.globl SYMBOL_NAME(inthandler6)
.globl SYMBOL_NAME(inthandler7)
.globl SYMBOL_NAME(inthandler8)
.globl SYMBOL_NAME(inthandler)
.globl SYMBOL_NAME(inthandler_wrap)
.globl SYMBOL_NAME(timerhandler)
.globl SYMBOL_NAME(serialhandler)
.globl SYMBOL_NAME(sys_call_table)
.globl SYMBOL_NAME(sys_fork), SYMBOL_NAME(sys_clone)
.globl SYMBOL_NAME(ret_from_interrupt), SYMBOL_NAME(bad_interrupt)

.text
ENTRY(buserr)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall

	movel	%sp,%sp@- 		| stack frame pointer argument
	jsr	SYMBOL_NAME(buserr_c)
	addql	#4,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall

	movew %sp@(LFORMATVEC),%d0
	lsrl	#2, %d0
	andl	#0x3ff,%d0

	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	%d0,%sp@-

	moveq	#-1,%d0

	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap3)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#3,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap4)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#4,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap5)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#5,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap6)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#6,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap7)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#7,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap8)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#8,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap9)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#9,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)


ENTRY(trap10)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#10,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap11)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#11,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap12)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#12,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)


ENTRY(trap13)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#13,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)


ENTRY(trap14)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#14,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)


ENTRY(trap15)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#15,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)


ENTRY(trap33)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#33,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap34)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#34,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)


ENTRY(trap35)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#35,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap36)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#36,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap37)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#37,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap38)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#38,%sp@-
	jsr	SYMBOL_NAME(trap_c)
	addql	#8,%sp
	jra	SYMBOL_NAME(ret_from_exception)

ENTRY(trap39)
	SAVE_ALL
	moveq	#-1,%d0
	movel	%d0,%sp@(LORIG_D0)	| a -1 in the ORIG_D0 field
					| signifies that the stack frame
					| is NOT for syscall
	movel	%sp,%sp@- 		| stack frame pointer argument
	movel	#39,%sp@-
	jsr	SYMBOL_NAME(trap_c)