diff options
Diffstat (limited to 'lib/libc/arch/i386/sys/sbrk.S')
| -rw-r--r-- | lib/libc/arch/i386/sys/sbrk.S | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/libc/arch/i386/sys/sbrk.S b/lib/libc/arch/i386/sys/sbrk.S new file mode 100644 index 00000000000..6cdd6b84bee --- /dev/null +++ b/lib/libc/arch/i386/sys/sbrk.S @@ -0,0 +1,87 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * 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 the University of + * California, Berkeley and its contributors. + * 4. 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. + * + * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 + * $Id: sbrk.S,v 1.1 1995/10/18 08:41:26 deraadt Exp $ + */ + +#if defined(SYSLIBC_SCCS) && !defined(lint) + .text + .asciz "$Id: sbrk.S,v 1.1 1995/10/18 08:41:26 deraadt Exp $" +#endif /* SYSLIBC_SCCS and not lint */ + +#include "SYS.h" + + .globl _end + .globl curbrk + + .data +curbrk: .long _end + .text + +ENTRY(sbrk) +#ifdef PIC + movl 4(%esp),%ecx + PIC_PROLOGUE + movl PIC_GOT(curbrk),%edx + PIC_EPILOGUE + movl (%edx),%eax + addl %eax,4(%esp) + movl $(SYS_break),%eax + int $0x80 + jc err + PIC_PROLOGUE + movl PIC_GOT(curbrk),%edx + PIC_EPILOGUE + movl (%edx),%eax + addl %ecx,(%edx) + ret +err: + jmp PIC_PLT(cerror) + +#else + + movl 4(%esp),%ecx + movl curbrk,%eax + addl %eax,4(%esp) + movl $(SYS_break),%eax + int $0x80 + jc err + movl curbrk,%eax + addl %ecx,curbrk + ret +err: + jmp cerror +#endif |