135 lines
2.1 KiB
ArmAsm
135 lines
2.1 KiB
ArmAsm
/*
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* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009 PetaLogix
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* Copyright (C) 2007 LynuxWorks, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/errno.h>
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#include <linux/linkage.h>
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/*
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* int __strncpy_user(char *to, char *from, int len);
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*
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* Returns:
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* -EFAULT for an exception
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* len if we hit the buffer limit
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* bytes copied
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*/
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.text
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.globl __strncpy_user;
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.align 4;
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__strncpy_user:
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/*
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* r5 - to
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* r6 - from
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* r7 - len
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* r3 - temp count
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* r4 - temp val
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*/
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addik r3,r7,0 /* temp_count = len */
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beqi r3,3f
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1:
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lbu r4,r6,r0
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sb r4,r5,r0
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addik r3,r3,-1
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beqi r3,2f /* break on len */
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addik r5,r5,1
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bneid r4,1b
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addik r6,r6,1 /* delay slot */
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addik r3,r3,1 /* undo "temp_count--" */
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2:
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rsubk r3,r3,r7 /* temp_count = len - temp_count */
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3:
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rtsd r15,8
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nop
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.section .fixup, "ax"
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.align 2
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4:
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brid 3b
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addik r3,r0, -EFAULT
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.section __ex_table, "a"
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.word 1b,4b
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/*
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* int __strnlen_user(char __user *str, int maxlen);
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*
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* Returns:
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* 0 on error
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* maxlen + 1 if no NUL byte found within maxlen bytes
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* size of the string (including NUL byte)
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*/
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.text
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.globl __strnlen_user;
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.align 4;
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__strnlen_user:
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addik r3,r6,0
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beqi r3,3f
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1:
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lbu r4,r5,r0
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beqid r4,2f /* break on NUL */
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addik r3,r3,-1 /* delay slot */
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bneid r3,1b
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addik r5,r5,1 /* delay slot */
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addik r3,r3,-1 /* for break on len */
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2:
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rsubk r3,r3,r6
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3:
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rtsd r15,8
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nop
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.section .fixup,"ax"
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4:
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brid 3b
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addk r3,r0,r0
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.section __ex_table,"a"
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.word 1b,4b
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/*
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* int __copy_tofrom_user(char *to, char *from, int len)
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* Return:
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* 0 on success
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* number of not copied bytes on error
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*/
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.text
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.globl __copy_tofrom_user;
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.align 4;
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__copy_tofrom_user:
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/*
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* r5 - to
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* r6 - from
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* r7, r3 - count
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* r4 - tempval
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*/
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addik r3,r7,0
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beqi r3,3f
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1:
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lbu r4,r6,r0
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addik r6,r6,1
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2:
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sb r4,r5,r0
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addik r3,r3,-1
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bneid r3,1b
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addik r5,r5,1 /* delay slot */
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3:
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rtsd r15,8
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nop
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.section __ex_table,"a"
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.word 1b,3b,2b,3b
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