diff options
Diffstat (limited to 'lib/libc/i386/string/bzero.S')
| -rw-r--r-- | lib/libc/i386/string/bzero.S | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/libc/i386/string/bzero.S b/lib/libc/i386/string/bzero.S new file mode 100644 index 0000000..f66bd78 --- /dev/null +++ b/lib/libc/i386/string/bzero.S @@ -0,0 +1,81 @@ +/* + * Copyright (c) 1993 Winning Strategies, Inc. + * All rights reserved. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Winning Strategies, Inc. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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("$FreeBSD$"); + +/* + * bzero (void *b, size_t len) + * write len zero bytes to the string b. + * + * Written by: + * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. + */ + +ENTRY(bzero) + pushl %edi + pushl %ebx + movl 12(%esp),%edi + movl 16(%esp),%ecx + + cld /* set fill direction forward */ + xorl %eax,%eax /* set fill data to 0 */ + + /* + * if the string is too short, it's really not worth the overhead + * of aligning to word boundries, etc. So we jump to a plain + * unaligned set. + */ + cmpl $0x0f,%ecx + jle L1 + + movl %edi,%edx /* compute misalignment */ + negl %edx + andl $3,%edx + movl %ecx,%ebx + subl %edx,%ebx + + movl %edx,%ecx /* zero until word aligned */ + rep + stosb + + movl %ebx,%ecx /* zero by words */ + shrl $2,%ecx + rep + stosl + + movl %ebx,%ecx + andl $3,%ecx /* zero remainder by bytes */ +L1: rep + stosb + + popl %ebx + popl %edi + ret |
