diff options
Diffstat (limited to 'lib/libc/arch/sparc/sys/brk.S')
| -rw-r--r-- | lib/libc/arch/sparc/sys/brk.S | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/arch/sparc/sys/brk.S b/lib/libc/arch/sparc/sys/brk.S new file mode 100644 index 00000000000..1436c459412 --- /dev/null +++ b/lib/libc/arch/sparc/sys/brk.S @@ -0,0 +1,89 @@ +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * 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: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp + * $Id: brk.S,v 1.1 1995/10/18 08:41:41 deraadt Exp $ + */ + +#if defined(LIBC_SCCS) && !defined(lint) + .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" +#endif /* LIBC_SCCS and not lint */ + +#include "SYS.h" + + .globl curbrk + .globl minbrk + + .data +minbrk: .long _end ! lower brk limit; also for gmon code + .text + +#ifdef PIC +ENTRY(brk) + PIC_PROLOGUE(%o5,%o4) + ld [%o5 + minbrk], %o4 + ld [%o4], %o1 ! %o1 = minbrk + cmp %o1, %o0 ! if (minbrk > %o0) + bg,a 0f + mov %o1, %o0 ! %o0 = minbrk +0: + mov %o0, %o2 ! save argument to syscall + mov SYS_break, %g1 + t ST_SYSCALL + bcc,a 1f + ld [%o5 + curbrk], %o4 + ERROR() +1: + retl ! success, return 0 & record new break + st %o2, [%o4] +#else +ENTRY(brk) + sethi %hi(minbrk), %o1 ! %o1 = minbrk + ld [%o1 + %lo(minbrk)], %o1 + cmp %o1, %o0 ! if (minbrk > %o0) + bg,a 0f + mov %o1, %o0 ! %o0 = minbrk +0: + mov %o0, %o2 ! save argument to syscall + mov SYS_break, %g1 + t ST_SYSCALL + bcc,a 1f + sethi %hi(curbrk), %g1 + ERROR() +1: + retl ! success, return 0 & record new break + st %o2, [%g1 + %lo(curbrk)] +#endif |