1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * Returns 0 if exception before NUL or reaching the supplied limit (N),
| * a value greater than N if the string is longer than the limit, else
| * strlen.
| *
| * Inputs:
| * in0: address of buffer
| * in1: string length limit N
| * Outputs:
| * r8: 0 in case of fault, strlen(buffer)+1 otherwise
| *
| * Copyright (C) 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
| */
|
| #include <asm/asmmacro.h>
| #include <asm/export.h>
|
| GLOBAL_ENTRY(__strnlen_user)
| .prologue
| alloc r2=ar.pfs,2,0,0,0
| .save ar.lc, r16
| mov r16=ar.lc // preserve ar.lc
|
| .body
|
| add r3=-1,in1
| ;;
| mov ar.lc=r3
| mov r9=0
| ;;
| // XXX braindead strlen loop---this needs to be optimized
| .Loop1:
| EXCLR(.Lexit, ld1 r8=[in0],1)
| add r9=1,r9
| ;;
| cmp.eq p6,p0=r8,r0
| (p6) br.cond.dpnt .Lexit
| br.cloop.dptk.few .Loop1
|
| add r9=1,in1 // NUL not found---return N+1
| ;;
| .Lexit:
| mov r8=r9
| mov ar.lc=r16 // restore ar.lc
| br.ret.sptk.many rp
| END(__strnlen_user)
| EXPORT_SYMBOL(__strnlen_user)
|
|
