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48 lines
996 B
48 lines
996 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Returns 0 if exception before NUL or reaching the supplied limit (N), |
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* a value greater than N if the string is longer than the limit, else |
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* strlen. |
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* |
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* Inputs: |
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* in0: address of buffer |
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* in1: string length limit N |
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* Outputs: |
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* r8: 0 in case of fault, strlen(buffer)+1 otherwise |
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* |
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* Copyright (C) 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com> |
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*/ |
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#include <asm/asmmacro.h> |
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#include <asm/export.h> |
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GLOBAL_ENTRY(__strnlen_user) |
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.prologue |
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alloc r2=ar.pfs,2,0,0,0 |
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.save ar.lc, r16 |
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mov r16=ar.lc // preserve ar.lc |
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.body |
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add r3=-1,in1 |
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;; |
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mov ar.lc=r3 |
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mov r9=0 |
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;; |
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// XXX braindead strlen loop---this needs to be optimized |
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.Loop1: |
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EXCLR(.Lexit, ld1 r8=[in0],1) |
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add r9=1,r9 |
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;; |
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cmp.eq p6,p0=r8,r0 |
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(p6) br.cond.dpnt .Lexit |
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br.cloop.dptk.few .Loop1 |
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add r9=1,in1 // NUL not found---return N+1 |
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;; |
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.Lexit: |
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mov r8=r9 |
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mov ar.lc=r16 // restore ar.lc |
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br.ret.sptk.many rp |
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END(__strnlen_user) |
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EXPORT_SYMBOL(__strnlen_user)
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