]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * Just like strncpy() except that if a fault occurs during copying, | |
4 | * -EFAULT is returned. | |
5 | * | |
6 | * Inputs: | |
7 | * in0: address of destination buffer | |
8 | * in1: address of string to be copied | |
9 | * in2: length of buffer in bytes | |
10 | * Outputs: | |
11 | * r8: -EFAULT in case of fault or number of bytes copied if no fault | |
12 | * | |
13 | * Copyright (C) 1998-2001 Hewlett-Packard Co | |
14 | * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com> | |
15 | * | |
16 | * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by | |
17 | * by Andreas Schwab <schwab@suse.de>). | |
18 | */ | |
19 | ||
20 | #include <asm/asmmacro.h> | |
e007c533 | 21 | #include <asm/export.h> |
1da177e4 LT |
22 | |
23 | GLOBAL_ENTRY(__strncpy_from_user) | |
24 | alloc r2=ar.pfs,3,0,0,0 | |
25 | mov r8=0 | |
26 | mov r9=in1 | |
27 | ;; | |
28 | add r10=in1,in2 | |
29 | cmp.eq p6,p0=r0,in2 | |
30 | (p6) br.ret.spnt.many rp | |
31 | ||
32 | // XXX braindead copy loop---this needs to be optimized | |
33 | .Loop1: | |
34 | EX(.Lexit, ld1 r8=[in1],1) | |
35 | ;; | |
36 | EX(.Lexit, st1 [in0]=r8,1) | |
37 | cmp.ne p6,p7=r8,r0 | |
38 | ;; | |
39 | (p6) cmp.ne.unc p8,p0=in1,r10 | |
40 | (p8) br.cond.dpnt.few .Loop1 | |
41 | ;; | |
42 | (p6) mov r8=in2 // buffer filled up---return buffer length | |
43 | (p7) sub r8=in1,r9,1 // return string length (excluding NUL character) | |
44 | [.Lexit:] | |
45 | br.ret.sptk.many rp | |
46 | END(__strncpy_from_user) | |
e007c533 | 47 | EXPORT_SYMBOL(__strncpy_from_user) |