diff options
Diffstat (limited to 'lib/libc/mips/string/bzero.S')
-rw-r--r-- | lib/libc/mips/string/bzero.S | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/lib/libc/mips/string/bzero.S b/lib/libc/mips/string/bzero.S deleted file mode 100644 index 66f29dd..0000000 --- a/lib/libc/mips/string/bzero.S +++ /dev/null @@ -1,101 +0,0 @@ -/* $NetBSD: bzero.S,v 1.10 2009/12/14 02:53:52 matt Exp $ */ - -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Ralph Campbell. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include <machine/asm.h> -__FBSDID("$FreeBSD$"); - -#if defined(LIBC_SCCS) && !defined(lint) -#if 0 - ASMSTR("from: @(#)bzero.s 8.1 (Berkeley) 6/4/93") -#else - ASMSTR("$NetBSD: bzero.S,v 1.10 2009/12/14 02:53:52 matt Exp $") -#endif -#endif /* LIBC_SCCS and not lint */ - -#define _LOCORE /* XXX not really, just assembly-code source */ -#include <machine/endian.h> - -#ifdef __ABICALLS__ - .abicalls -#endif - -/* bzero(s1, n) */ - -LEAF(bzero) - .set noreorder - blt a1, 3*SZREG, smallclr # small amount to clear? - PTR_SUBU a3, zero, a0 # compute # bytes to word align address - and a3, a3, SZREG-1 - beq a3, zero, 1f # skip if word aligned -#if SZREG == 4 - PTR_SUBU a1, a1, a3 # subtract from remaining count - SWHI zero, 0(a0) # clear 1, 2, or 3 bytes to align - PTR_ADDU a0, a0, a3 -#endif -#if SZREG == 8 - PTR_SUBU a1, a1, a3 # subtract from remaining count - PTR_ADDU a0, a0, a3 # align dst to next word - sll a3, a3, 3 # bits to bytes - li a2, -1 # make a mask -#if _BYTE_ORDER == _BIG_ENDIAN - REG_SRLV a2, a2, a3 # we want to keep the MSB bytes -#endif -#if _BYTE_ORDER == _LITTLE_ENDIAN - REG_SLLV a2, a2, a3 # we want to keep the LSB bytes -#endif - nor a2, zero, a2 # complement the mask - REG_L v0, -SZREG(a0) # load the word to partially clear - and v0, v0, a2 # clear the bytes - REG_S v0, -SZREG(a0) # store it back -#endif -1: - and v0, a1, SZREG-1 # compute number of words left - PTR_SUBU a3, a1, v0 - move a1, v0 - PTR_ADDU a3, a3, a0 # compute ending address -2: - PTR_ADDU a0, a0, SZREG # clear words - bne a0, a3, 2b # unrolling loop doesnt help - REG_S zero, -SZREG(a0) # since we are limited by memory speed -smallclr: - ble a1, zero, 2f - PTR_ADDU a3, a1, a0 # compute ending address -1: - PTR_ADDU a0, a0, 1 # clear bytes - bne a0, a3, 1b - sb zero, -1(a0) -2: - j ra - nop -END(bzero) |