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
49
50
51
52
53
54
55
56
57
58
|
/*
* 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 David Mosberger-Tang <davidm@hpl.hp.com>
*/
#include <asm/asmmacro.h>
/* If a fault occurs, r8 gets set to -EFAULT and r9 gets cleared. */
#define EX(x...) \
.section __ex_table,"a"; \
data4 @gprel(99f); \
data4 (.Lexit-99f)|1; \
.previous \
99: x;
.text
.psr abi64
.psr lsb
.lsb
GLOBAL_ENTRY(__strnlen_user)
UNW(.prologue)
alloc r2=ar.pfs,2,0,0,0
UNW(.save ar.lc, r16)
mov r16=ar.lc // preserve ar.lc
UNW(.body)
add r3=-1,in1
;;
mov ar.lc=r3
mov r9=0
// XXX braindead strlen loop---this needs to be optimized
.Loop1:
EX(ld1 r8=[in0],1)
add r9=1,r9
;;
cmp.eq p6,p0=r8,r0
(p6) br.dpnt.few .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.few rp
END(__strnlen_user)
|
