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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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46 lines
903 B
ArmAsm
46 lines
903 B
ArmAsm
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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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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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