--- /dev/null
+++ Libc/Libc-763.13/ppc/gen/makecontext.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2004, 2009 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@
+ */
+
+/*
+ * Copyright (c) 2004 Suleiman Souhlal
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#if defined(__ppc__)
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <ucontext.h>
+#include <unistd.h>
+
+void _ctx_done(ucontext_t *ucp);
+void _ctx_start(void);
+
+void
+_ctx_done(ucontext_t *ucp)
+{
+	if (ucp->uc_link == NULL)
+		exit(0);
+	else {
+		/* invalidate context */
+		ucp->uc_mcsize = 0;
+
+		setcontext((const ucontext_t *)ucp->uc_link);
+
+		LIBC_ABORT("setcontext failed"); /* should never return from above call */
+	}
+}
+
+void
+makecontext(ucontext_t *ucp, void (*start)(), int argc, ...)
+{
+	mcontext_t mc;
+	char *sp;
+	va_list ap;
+	int i, regargs, stackargs;
+	uint32_t args[8];
+
+	/* Sanity checks */
+	if ((ucp == NULL) || (argc < 0) || (argc > NCARGS)
+	    || (ucp->uc_stack.ss_sp == NULL)
+	    || (ucp->uc_stack.ss_size < 8192)) {
+		/* invalidate context */
+		ucp->uc_mcsize = 0;
+		return;
+	}
+
+	/*
+	 * The stack must have space for the frame pointer, saved
+	 * link register, overflow arguments, and be 16-byte
+	 * aligned.
+	 */
+	stackargs = (argc > 8) ? argc - 8 : 0;
+	sp = (char *) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size
+		- sizeof(uint32_t)*(stackargs + 2);
+	sp = (char *)((uint32_t)sp & ~0x1f);
+
+	mc = ucp->uc_mcontext;
+
+	/*
+	 * Up to 8 register args. Assumes all args are 32-bit and
+	 * integer only. Not sure how to cater for floating point,
+	 * although 64-bit args will work if aligned correctly
+	 * in the arg list.
+	 */
+	regargs = (argc > 8) ? 8 : argc;
+	va_start(ap, argc);
+	for (i = 0; i < regargs; i++)
+		args[i] = va_arg(ap, uint32_t);
+
+	switch (regargs) {
+		/*
+		 * Hi Tom!
+		 */
+		case 8 : mc->ss.r10 = args[7];
+		case 7 : mc->ss.r9  = args[6];
+		case 6 : mc->ss.r8  = args[5];
+		case 5 : mc->ss.r7  = args[4];
+		case 4 : mc->ss.r6  = args[3];
+		case 3 : mc->ss.r5  = args[2];
+		case 2 : mc->ss.r4  = args[1];
+		case 1 : mc->ss.r3  = args[0];
+		default: break;
+	}
+
+	/*
+	 * Overflow args go onto the stack
+	 */
+	if (argc > 8) {
+		uint32_t *argp;
+
+		/* Skip past frame pointer and saved LR */
+		argp = (uint32_t *)sp + 2;
+
+		for (i = 0; i < stackargs; i++)
+			*argp++ = va_arg(ap, uint32_t);
+	}
+	va_end(ap);
+
+	/*
+	 * Use caller-saved regs 14/15 to hold params that _ctx_start
+	 * will use to invoke the user-supplied func
+	 */
+	mc->ss.srr0 = (uint32_t) _ctx_start;
+	mc->ss.r1   = (uint32_t) sp;	/* new stack pointer */
+	mc->ss.r14  = (uint32_t) start;	/* r14 <- start */
+	mc->ss.r15  = (uint32_t) ucp;	/* r15 <- ucp */
+}
+
+#endif /* __ppc__ */