brk from NetBSD

1 files changed, 91 insertions, 0 deletions

diff --git a/lib/libc/arch/sparc64/sys/brk.S b/lib/libc/arch/sparc64/sys/brk.S
new file mode 100644
index 00000000000..fb1bc85d768
--- /dev/null
+++ b/lib/libc/arch/sparc64/sys/brk.S
@@ -0,0 +1,91 @@
+/*	$OpenBSD: brk.S,v 1.1 2001/08/28 22:25:59 art Exp $	*/
+/*	$NetBSD: brk.S,v 1.9 2000/07/25 20:15:40 mycroft Exp $	*/
+
+/*
+ * 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.
+ */
+
+#include <machine/asm.h>
+
+#include "SYS.h"
+
+	.globl	_C_LABEL(__curbrk)
+	.globl	_C_LABEL(__minbrk)
+	.globl	_C_LABEL(_end)
+
+#ifdef WEAK_ALIAS
+WEAK_ALIAS(brk, _brk)
+#endif
+
+	.data
+	.align	8
+_C_LABEL(__minbrk):
+	.xword	_C_LABEL(_end)		/* lower brk limit; also for gmon code */
+	.text
+
+ENTRY(_brk)
+#ifdef PIC
+	PIC_PROLOGUE(%o5,%o4)
+	set	_C_LABEL(__minbrk), %o4
+	ldx	[%o5 + %o4], %o4
+	ldx	[%o4], %o1		/* %o1 = minbrk */
+	cmp	%o1, %o0		/* if (minbrk > %o0) */
+	movg	%xcc, %o1, %o0		/*	%o0 = minbrk */
+	mov	%o0, %o2		/* save argument to syscall */
+	mov	SYS_break, %g1
+	t	ST_SYSCALL
+	set	_C_LABEL(__curbrk), %o3
+	bcc,a,pt	%icc, 1f
+	 ldx	[%o5 + %o3], %o4
+	ERROR()
+1:
+	retl				/* success, return 0 & record new break */
+	 stx	%o2, [%o4]
+#else
+	sethi	%hi(_C_LABEL(__minbrk)), %o1	/* %o1 = minbrk */
+	ldx	[%o1 + %lo(_C_LABEL(__minbrk))], %o1
+	cmp	%o1, %o0		/* if (minbrk > %o0) */
+	movg	%xcc, %o1, %o0		/*	%o0 = minbrk */
+	mov	%o0, %o2		/* save argument to syscall */
+	mov	SYS_break, %g1
+	t	ST_SYSCALL
+	bcc,a,pt	%icc,1f
+	 sethi	%hi(_C_LABEL(__curbrk)), %g1
+	ERROR()
+1:
+	retl				/* success, return 0 & record new break */
+	 stx	%o2, [%g1 + %lo(_C_LABEL(__curbrk))]
+#endif