1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libc/sparc64/gen/makecontext.c b/lib/libc/sparc64/gen/makecontext.c
new file mode 100644
index 0000000..95795de
--- /dev/null
+++ b/lib/libc/sparc64/gen/makecontext.c
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 2003 Jake Burkholder.
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/signal.h>
+#include <sys/ucontext.h>
+
+#include <machine/frame.h>
+#include <machine/tstate.h>
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+__weak_reference(__makecontext, makecontext);
+
+void _ctx_done(ucontext_t *ucp);
+void _ctx_start(void);
+
+void
+__makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
+{
+	mcontext_t *mc;
+	uint64_t sp;
+	va_list ap;
+	int i;
+
+	mc = &ucp->uc_mcontext;
+	if (ucp == NULL ||
+	    (mc->mc_flags & ((1L << _MC_VERSION_BITS) - 1)) != _MC_VERSION)
+		return;
+	if ((argc < 0) || (argc > 6) ||
+	    (ucp->uc_stack.ss_sp == NULL) ||
+	    (ucp->uc_stack.ss_size < MINSIGSTKSZ)) {
+		mc->mc_flags = 0;
+		return;
+	}
+	mc = &ucp->uc_mcontext;
+	sp = (uint64_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size;
+	va_start(ap, argc);
+	for (i = 0; i < argc; i++)
+		mc->mc_out[i] = va_arg(ap, uint64_t);
+	va_end(ap);
+	mc->mc_global[1] = (uint64_t)start;
+	mc->mc_global[2] = (uint64_t)ucp;
+	mc->mc_out[6] = sp - SPOFF - sizeof(struct frame);
+	mc->mc_tnpc = (uint64_t)_ctx_start + 4;
+	mc->mc_tpc = (uint64_t)_ctx_start;
+}
+
+void
+_ctx_done(ucontext_t *ucp)
+{
+
+	if (ucp->uc_link == NULL)
+		exit(0);
+	else {
+		ucp->uc_mcontext.mc_flags = 0;
+		setcontext((const ucontext_t *)ucp->uc_link);
+		abort();
+	}
+}