Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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, 2004 by Ralf Baechle

 * Copyright (c) 1999 Silicon Graphics, Inc.

 */

#include 

#include 

#include 

#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 NUL character upto a

 * maximum of a1 or 0 in case of error.

 *

 * Note: for performance reasons we deliberately accept that a user may

 *       make strlen_user and strnlen_user access the first few KSEG0

 *       bytes.  There's nothing secret there.  On 64-bit accessing beyond

 *       the maximum is a tad hairier ...

 */

LEAF(__strnlen_user_asm)

        LONG_L          v0, TI_ADDR_LIMIT($28)  # pointer ok?

        and             v0, a0

        bnez            v0, fault

FEXPORT(__strnlen_user_nocheck_asm)

        move            v0, a0

        PTR_ADDU        a1, a0                  # stop pointer

1:      beq             v0, a1, 1f              # limit reached?

        EX(lb, t0, (v0), fault)

        PTR_ADDU        v0, 1

        bnez            t0, 1b

1:      PTR_SUBU        v0, a0

        jr              ra

        END(__strnlen_user_asm)

fault:  move            v0, zero

        jr              ra