Subversion Repositories or1k

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 1996, 1998, 1999 by Ralf Baechle
 * Copyright (c) 1999 Silicon Graphics, Inc.
 */
#include <asm/asm.h>
#include <asm/offset.h>
#include <asm/regdef.h>
#include <asm/sgidefs.h>

#define EX(insn,reg,addr,handler)                       \
9:      insn    reg, addr;                              \
        .section __ex_table,"a";                        \
        PTR     9b, handler;                            \
        .previous

/*
 * Return the size of a string (including the ending 0)
 *
 * Return 0 for error, len on string but at max a1 otherwise
 */
LEAF(__strnlen_user_asm)
        ld      v0, THREAD_CURDS($28)   # pointer ok?
        and     v0, a0
        bnez    v0, fault

FEXPORT(__strnlen_user_nocheck_asm)
        move    v0, a0
        daddu   a1, a0                  # stop pointer
1:      beq     v0, a1, 1f              # limit reached?
        EX(lb, ta0, (v0), fault)
        daddiu  v0, 1
        bnez    ta0, 1b
1:      dsubu   v0, a0
        jr      ra
        END(__strnlen_user_asm)

fault:  move    v0, zero
        jr      ra