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										 |  |  | /* | 
					
						
							|  |  |  |  *  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 | 
					
						
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										 |  |  |  *		r1 contains the address limit, which must be preserved | 
					
						
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										 |  |  |  *		r2, r3 contains the value | 
					
						
							|  |  |  |  * Outputs:	r0 is the error code | 
					
						
							|  |  |  |  *		lr corrupted | 
					
						
							|  |  |  |  * | 
					
						
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										 |  |  |  * No other registers must be altered.  (see <asm/uaccess.h> | 
					
						
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										 |  |  |  * 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. | 
					
						
							|  |  |  |  */ | 
					
						
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										 |  |  | #include <linux/linkage.h> | 
					
						
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										 |  |  | #include <asm/assembler.h> | 
					
						
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										 |  |  | #include <asm/errno.h> | 
					
						
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										 |  |  | #include <asm/domain.h> | 
					
						
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										 |  |  | 
 | 
					
						
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										 |  |  | ENTRY(__put_user_1) | 
					
						
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										 |  |  | 	check_uaccess r0, 1, r1, ip, __put_user_bad | 
					
						
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										 |  |  | 1: TUSER(strb)	r2, [r0] | 
					
						
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										 |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
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										 |  |  | ENDPROC(__put_user_1) | 
					
						
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										 |  |  | 
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										 |  |  | ENTRY(__put_user_2) | 
					
						
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										 |  |  | 	check_uaccess r0, 2, r1, ip, __put_user_bad | 
					
						
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										 |  |  | 	mov	ip, r2, lsr #8 | 
					
						
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										 |  |  | #ifdef CONFIG_THUMB2_KERNEL | 
					
						
							|  |  |  | #ifndef __ARMEB__ | 
					
						
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										 |  |  | 2: TUSER(strb)	r2, [r0] | 
					
						
							|  |  |  | 3: TUSER(strb)	ip, [r0, #1] | 
					
						
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										 |  |  | #else | 
					
						
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										 |  |  | 2: TUSER(strb)	ip, [r0] | 
					
						
							|  |  |  | 3: TUSER(strb)	r2, [r0, #1] | 
					
						
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										 |  |  | #endif | 
					
						
							|  |  |  | #else	/* !CONFIG_THUMB2_KERNEL */ | 
					
						
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										 |  |  | #ifndef __ARMEB__ | 
					
						
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										 |  |  | 2: TUSER(strb)	r2, [r0], #1 | 
					
						
							|  |  |  | 3: TUSER(strb)	ip, [r0] | 
					
						
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										 |  |  | #else | 
					
						
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										 |  |  | 2: TUSER(strb)	ip, [r0], #1 | 
					
						
							|  |  |  | 3: TUSER(strb)	r2, [r0] | 
					
						
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										 |  |  | #endif | 
					
						
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										 |  |  | #endif	/* CONFIG_THUMB2_KERNEL */ | 
					
						
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										 |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
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										 |  |  | ENDPROC(__put_user_2) | 
					
						
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										 |  |  | 
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										 |  |  | ENTRY(__put_user_4) | 
					
						
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										 |  |  | 	check_uaccess r0, 4, r1, ip, __put_user_bad | 
					
						
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										 |  |  | 4: TUSER(str)	r2, [r0] | 
					
						
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										 |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
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										 |  |  | ENDPROC(__put_user_4) | 
					
						
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										 |  |  | 
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										 |  |  | ENTRY(__put_user_8) | 
					
						
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										 |  |  | 	check_uaccess r0, 8, r1, ip, __put_user_bad | 
					
						
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										 |  |  | #ifdef CONFIG_THUMB2_KERNEL | 
					
						
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										 |  |  | 5: TUSER(str)	r2, [r0] | 
					
						
							|  |  |  | 6: TUSER(str)	r3, [r0, #4] | 
					
						
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										 |  |  | #else | 
					
						
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										 |  |  | 5: TUSER(str)	r2, [r0], #4 | 
					
						
							|  |  |  | 6: TUSER(str)	r3, [r0] | 
					
						
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										 |  |  | #endif | 
					
						
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										 |  |  | 	mov	r0, #0 | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
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										 |  |  | ENDPROC(__put_user_8) | 
					
						
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										 |  |  | 
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							|  |  |  | __put_user_bad: | 
					
						
							|  |  |  | 	mov	r0, #-EFAULT | 
					
						
							|  |  |  | 	mov	pc, lr | 
					
						
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										 |  |  | ENDPROC(__put_user_bad) | 
					
						
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										 |  |  | 
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										 |  |  | .pushsection __ex_table, "a" | 
					
						
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										 |  |  | 	.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 | 
					
						
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										 |  |  | .popsection |