Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*
 * 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>

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)