1 files changed, 96 insertions, 0 deletions
diff --git a/lib/libc/arm/gen/makecontext.c b/lib/libc/arm/gen/makecontext.c
new file mode 100644
index 0000000..4fd3953
--- /dev/null
+++ b/lib/libc/arm/gen/makecontext.c
@@ -0,0 +1,96 @@
+/*	$NetBSD: makecontext.c,v 1.2 2003/01/18 11:06:24 thorpej Exp $	*/
+
+/*-
+ * Copyright (c) 2001 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Klaus Klein.
+ *
+ * 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 NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <inttypes.h>
+#include <ucontext.h>
+
+#include <stdarg.h>
+
+extern void _ctx_start(void);
+
+void
+ctx_done(ucontext_t *ucp)
+{       
+	        
+	if (ucp->uc_link == NULL)
+		exit(0);
+	else {  
+		setcontext((const ucontext_t *)ucp->uc_link);
+		abort();
+	}                                                      
+}   
+
+__weak_reference(__makecontext, makecontext);
+
+void
+__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+{
+	__greg_t *gr = ucp->uc_mcontext.__gregs;
+	int i;
+	unsigned int *sp;
+	va_list ap;
+
+	/* Compute and align stack pointer. */
+	sp = (unsigned int *)
+	    (((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size -
+	      sizeof(double)) & ~7);
+	/* Allocate necessary stack space for arguments exceeding r0-3. */
+	if (argc > 4)
+		sp -= argc - 4;
+	gr[_REG_SP] = (__greg_t)sp;
+	/* Wipe out frame pointer. */
+	gr[_REG_FP] = 0;
+	/* Arrange for return via the trampoline code. */
+	gr[_REG_PC] = (__greg_t)_ctx_start;
+	gr[_REG_R4] = (__greg_t)func;
+	gr[_REG_R5] = (__greg_t)ucp;
+
+	va_start(ap, argc);
+	/* Pass up to four arguments in r0-3. */
+	for (i = 0; i < argc && i < 4; i++)
+		gr[_REG_R0 + i] = va_arg(ap, int);
+	/* Pass any additional arguments on the stack. */
+	for (argc -= i; argc > 0; argc--)
+		*sp++ = va_arg(ap, int);
+	va_end(ap);
+}