Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* strncpy_from_user.S: Sparc strncpy from userspace. |
2 | * | |
3 | * Copyright(C) 1996 David S. Miller | |
4 | */ | |
5 | ||
6 | #include <asm/ptrace.h> | |
7 | #include <asm/errno.h> | |
8 | ||
9 | .text | |
10 | .align 4 | |
11 | ||
12 | /* Must return: | |
13 | * | |
14 | * -EFAULT for an exception | |
15 | * count if we hit the buffer limit | |
16 | * bytes copied if we hit a null byte | |
17 | */ | |
18 | ||
19 | .globl __strncpy_from_user | |
20 | __strncpy_from_user: | |
21 | /* %o0=dest, %o1=src, %o2=count */ | |
22 | mov %o2, %o3 | |
23 | 1: | |
24 | subcc %o2, 1, %o2 | |
25 | bneg 2f | |
26 | nop | |
27 | 10: | |
28 | ldub [%o1], %o4 | |
29 | add %o0, 1, %o0 | |
30 | cmp %o4, 0 | |
31 | add %o1, 1, %o1 | |
32 | bne 1b | |
33 | stb %o4, [%o0 - 1] | |
34 | 2: | |
35 | add %o2, 1, %o0 | |
36 | retl | |
37 | sub %o3, %o0, %o0 | |
38 | ||
39 | .section .fixup,#alloc,#execinstr | |
40 | .align 4 | |
41 | 4: | |
42 | retl | |
43 | mov -EFAULT, %o0 | |
44 | ||
45 | .section __ex_table,#alloc | |
46 | .align 4 | |
47 | .word 10b, 4b |