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