[net-next-2.6.git] / arch / arm / lib / putuser.S

/*
 *  linux/arch/arm/lib/putuser.S
 *
 *  Copyright (C) 2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Idea from x86 version, (C) Copyright 1998 Linus Torvalds
 *
 * These functions have a non-standard call interface to make
 * them more efficient, especially as they return an error
 * value in addition to the "real" return value.
 *
 * __put_user_X
 *
 * Inputs:	r0 contains the address
 *		r2, r3 contains the value
 * Outputs:	r0 is the error code
 *		lr corrupted
 *
 * No other registers must be altered.  (see <asm/uaccess.h>
 * for specific ASM register usage).
 *
 * Note that ADDR_LIMIT is either 0 or 0xc0000000
 * Note also that it is intended that __put_user_bad is not global.
 */
#include <linux/linkage.h>
#include <asm/errno.h>

ENTRY(__put_user_1)
1:	strbt	r2, [r0]
	mov	r0, #0
	mov	pc, lr
ENDPROC(__put_user_1)

ENTRY(__put_user_2)
	mov	ip, r2, lsr #8
#ifdef CONFIG_THUMB2_KERNEL
#ifndef __ARMEB__
2:	strbt	r2, [r0]
3:	strbt	ip, [r0, #1]
#else
2:	strbt	ip, [r0]
3:	strbt	r2, [r0, #1]
#endif
#else	/* !CONFIG_THUMB2_KERNEL */
#ifndef __ARMEB__
2:	strbt	r2, [r0], #1
3:	strbt	ip, [r0]
#else
2:	strbt	ip, [r0], #1
3:	strbt	r2, [r0]
#endif
#endif	/* CONFIG_THUMB2_KERNEL */
	mov	r0, #0
	mov	pc, lr
ENDPROC(__put_user_2)

ENTRY(__put_user_4)
4:	strt	r2, [r0]
	mov	r0, #0
	mov	pc, lr
ENDPROC(__put_user_4)

ENTRY(__put_user_8)
#ifdef CONFIG_THUMB2_KERNEL
5:	strt	r2, [r0]
6:	strt	r3, [r0, #4]
#else
5:	strt	r2, [r0], #4
6:	strt	r3, [r0]
#endif
	mov	r0, #0
	mov	pc, lr
ENDPROC(__put_user_8)

__put_user_bad:
	mov	r0, #-EFAULT
	mov	pc, lr
ENDPROC(__put_user_bad)

.section __ex_table, "a"
	.long	1b, __put_user_bad
	.long	2b, __put_user_bad
	.long	3b, __put_user_bad
	.long	4b, __put_user_bad
	.long	5b, __put_user_bad
	.long	6b, __put_user_bad
.previous
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/lib/putuser.S
	3	*
	4	* Copyright (C) 2001 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Idea from x86 version, (C) Copyright 1998 Linus Torvalds
	11	*
	12	* These functions have a non-standard call interface to make
	13	* them more efficient, especially as they return an error
	14	* value in addition to the "real" return value.
	15	*
	16	* __put_user_X
	17	*
	18	* Inputs: r0 contains the address
	19	* r2, r3 contains the value
	20	* Outputs: r0 is the error code
	21	* lr corrupted
	22	*
4baa9922	23	* No other registers must be altered. (see <asm/uaccess.h>
1da177e4 LT	24	* for specific ASM register usage).
	25	*
	26	* Note that ADDR_LIMIT is either 0 or 0xc0000000
	27	* Note also that it is intended that __put_user_bad is not global.
	28	*/
93ed3970	29	#include <linux/linkage.h>
1da177e4 LT	30	#include <asm/errno.h>
1da177e4 LT	31
93ed3970	32	ENTRY(__put_user_1)
1da177e4 LT	33	1: strbt r2, [r0]
	34	mov r0, #0
	35	mov pc, lr
93ed3970	36	ENDPROC(__put_user_1)
1da177e4	37
93ed3970	38	ENTRY(__put_user_2)
1da177e4	39	mov ip, r2, lsr #8
8b592783 CM	40	#ifdef CONFIG_THUMB2_KERNEL
	41	#ifndef __ARMEB__
	42	2: strbt r2, [r0]
	43	3: strbt ip, [r0, #1]
	44	#else
	45	2: strbt ip, [r0]
	46	3: strbt r2, [r0, #1]
	47	#endif
	48	#else /* !CONFIG_THUMB2_KERNEL */
1da177e4 LT	49	#ifndef __ARMEB__
	50	2: strbt r2, [r0], #1
	51	3: strbt ip, [r0]
	52	#else
	53	2: strbt ip, [r0], #1
	54	3: strbt r2, [r0]
	55	#endif
8b592783	56	#endif /* CONFIG_THUMB2_KERNEL */
1da177e4 LT	57	mov r0, #0
1da177e4 LT	58	mov pc, lr
93ed3970	59	ENDPROC(__put_user_2)
1da177e4	60
93ed3970	61	ENTRY(__put_user_4)
1da177e4 LT	62	4: strt r2, [r0]
	63	mov r0, #0
	64	mov pc, lr
93ed3970	65	ENDPROC(__put_user_4)
1da177e4	66
93ed3970	67	ENTRY(__put_user_8)
8b592783 CM	68	#ifdef CONFIG_THUMB2_KERNEL
	69	5: strt r2, [r0]
	70	6: strt r3, [r0, #4]
	71	#else
1da177e4 LT	72	5: strt r2, [r0], #4
1da177e4 LT	73	6: strt r3, [r0]
8b592783	74	#endif
1da177e4 LT	75	mov r0, #0
1da177e4 LT	76	mov pc, lr
93ed3970	77	ENDPROC(__put_user_8)
1da177e4 LT	78
	79	__put_user_bad:
	80	mov r0, #-EFAULT
	81	mov pc, lr
93ed3970	82	ENDPROC(__put_user_bad)
1da177e4 LT	83
	84	.section __ex_table, "a"
	85	.long 1b, __put_user_bad
	86	.long 2b, __put_user_bad
	87	.long 3b, __put_user_bad
	88	.long 4b, __put_user_bad
	89	.long 5b, __put_user_bad
	90	.long 6b, __put_user_bad
	91	.previous