--- /dev/null
+++ Libc/Libc-583/i386/gen/_setcontext.S
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2007 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#if defined(__i386__)
+
+#include <architecture/i386/asm_help.h>
+
+TEXT
+LABEL(__setcontext)
+	subl  $28, %esp
+	movl  32(%esp), %eax
+	movl  4(%eax), %eax
+	movl  %eax, (%esp)		/* load up signal mask */
+	CALL_EXTERN(_sigsetmask)	/* set signal mask */
+	addl  $28, %esp
+	movl  4(%esp), %ecx
+	movl  28(%ecx), %ecx
+	movl  16(%ecx), %ebx
+	movl  28(%ecx), %edi
+	movl  32(%ecx), %esi
+	movl  36(%ecx), %ebp
+	movl  40(%ecx), %esp
+	pushl 48(%ecx)
+	popfl
+	movl  12(%ecx), %eax
+	jmp   *52(%ecx)
+
+#endif /* __i386__ */