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/* strncpy_from_user.S: Sparc64 strncpy from userspace.
*
* Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <asm/asi.h>
#include <asm/errno.h>
.text
.align 4
/* Must return:
*
* -EFAULT for an exception
* count if we hit the buffer limit
* bytes copied if we hit a null byte
*/
.globl __strncpy_from_user
__strncpy_from_user:
/* %o0=dest, %o1=src, %o2=count */
brlez,pn %o2, 3f
add %o1, %o2, %o1
sub %g0, %o2, %o3
add %o0, %o2, %o0
10:
lduba [%o1 + %o3] ASI_S, %o4
1:
brz,pn %o4, 2f
stb %o4, [%o0 + %o3]
addcc %o3, 1, %o3
bne,pt %xcc, 1b
11:
lduba [%o1 + %o3] ASI_S, %o4
retl
mov %o2, %o0
2:
add %o3, 1, %o3
retl
add %o2, %o3, %o0
3:
retl
clr %o0
.section .fixup,#alloc,#execinstr
.align 4
4:
retl
mov -EFAULT, %o0
.section __ex_table,#alloc
.align 4
.word 10b, 4b
.word 11b, 4b
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