From 08422d98e3bda3af3716e7377f871c155858592f Mon Sep 17 00:00:00 2001
From: Chris Torek <torek@ucbvax.Berkeley.EDU>
Date: Thu, 25 Jun 1992 13:37:54 -0800
Subject: [PATCH] date and time created 92/06/25 06:37:54 by torek

SCCS-vsn: lib/libc/sparc/sys/Ovfork.s 5.1
SCCS-vsn: lib/libc/sparc/sys/brk.s 5.1
---
 usr/src/lib/libc/sparc/sys/Ovfork.s | 30 +++++++++++++++++++++
 usr/src/lib/libc/sparc/sys/brk.s    | 42 +++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 usr/src/lib/libc/sparc/sys/Ovfork.s
 create mode 100644 usr/src/lib/libc/sparc/sys/brk.s

diff --git a/usr/src/lib/libc/sparc/sys/Ovfork.s b/usr/src/lib/libc/sparc/sys/Ovfork.s
new file mode 100644
index 0000000000..eb58b4b4c4
--- /dev/null
+++ b/usr/src/lib/libc/sparc/sys/Ovfork.s
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 1992 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.
+ *
+ * %sccs.include.redist.c%
+ *
+ * from: $Header: Ovfork.s,v 1.1 91/07/06 13:05:56 torek Exp $
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+	.asciz "@(#)Ovfork.s	5.1 (Berkeley) %G%"
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * pid = vfork();
+ *
+ * %o1 == 0 in parent process, 1 in child process.
+ * %o0 == pid of child in parent, pid of parent in child.
+ */
+
+#include "SYS.h"
+
+SYSCALL(vfork)
+	dec	%o1		! from 1 to 0 in child, 0 to -1 in parent
+	retl
+	and	%o0, %o1, %o0	! return 0 in child, pid in parent
diff --git a/usr/src/lib/libc/sparc/sys/brk.s b/usr/src/lib/libc/sparc/sys/brk.s
new file mode 100644
index 0000000000..5f218a8bc9
--- /dev/null
+++ b/usr/src/lib/libc/sparc/sys/brk.s
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 1992 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.
+ *
+ * %sccs.include.redist.c%
+ *
+ * from: $Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp $
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+	.asciz "@(#)brk.s	5.1 (Berkeley) %G%"
+#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
+
+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)]
-- 
2.20.1