about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/m68k/clone.S
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/unix/sysv/linux/m68k/clone.S')
-rw-r--r--sysdeps/unix/sysv/linux/m68k/clone.S66
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/clone.S b/sysdeps/unix/sysv/linux/m68k/clone.S
new file mode 100644
index 0000000000..6baf723d9b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/clone.S
@@ -0,0 +1,66 @@
+/* Copyright (C) 1996,97,98,2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* clone is even more special than fork as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
+
+        .text
+ENTRY (__clone)
+
+	/* Sanity check arguments.  */
+	movel	#-EINVAL, %d0
+	movel	4(%sp), %a0		/* no NULL function pointers */
+	tstl	%a0
+	jeq	SYSCALL_ERROR_LABEL
+	movel	8(%sp), %a1		/* no NULL stack pointers */
+	tstl	%a1
+	jeq	SYSCALL_ERROR_LABEL
+
+	/* Allocate space and copy the argument onto the new stack.  */
+	movel	16(%sp), -(%a1)
+
+	/* Do the system call */
+	exg	%d2, %a1		/* save %d2 and get stack pointer */
+	movel	12(%sp), %d1		/* get flags */
+	movel	#SYS_ify (clone), %d0
+	trap	#0
+	exg	%d2, %a1		/* restore %d2 */
+
+	tstl	%d0
+	jmi	SYSCALL_ERROR_LABEL
+	jeq	thread_start
+
+	rts
+
+thread_start:
+	subl	%fp, %fp	/* terminate the stack frame */
+	jsr	(%a0)
+	movel	%d0, %d1
+	movel	#SYS_ify (exit), %d0
+	trap	#0
+
+PSEUDO_END (__clone)
+
+weak_alias (__clone, clone)