Index: head/lib/libthread_db/arch/aarch64/libpthread_md.c
===================================================================
--- head/lib/libthread_db/arch/aarch64/libpthread_md.c	(nonexistent)
+++ head/lib/libthread_db/arch/aarch64/libpthread_md.c	(revision 280952)
@@ -0,0 +1,96 @@
+/*-
+ * Copyright (c) 2014-2015 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Andrew Turner under
+ * sponsorship from the FreeBSD Foundation.
+ *
+ * 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/types.h>
+#include <string.h>
+#include <thread_db.h>
+
+#include "libpthread_db.h"
+
+void abort(void);
+
+void
+pt_reg_to_ucontext(const struct reg *r, ucontext_t *uc)
+{
+	mcontext_t *mc = &uc->uc_mcontext;
+
+	memcpy(mc->mc_gpregs.gp_x, r->x, sizeof(mc->mc_gpregs.gp_x));
+	mc->mc_gpregs.gp_sp = r->sp;
+	mc->mc_gpregs.gp_lr = r->lr;
+	mc->mc_gpregs.gp_elr = r->elr;
+	mc->mc_gpregs.gp_spsr = r->spsr;
+}
+
+void
+pt_ucontext_to_reg(const ucontext_t *uc, struct reg *r)
+{
+	const mcontext_t *mc = &uc->uc_mcontext;
+
+	memcpy(r->x, mc->mc_gpregs.gp_x, sizeof(mc->mc_gpregs.gp_x));
+	r->sp = mc->mc_gpregs.gp_sp;
+	r->lr = mc->mc_gpregs.gp_lr;
+	r->elr = mc->mc_gpregs.gp_elr;
+	r->spsr = mc->mc_gpregs.gp_spsr;
+}
+
+void
+pt_fpreg_to_ucontext(const struct fpreg *r, ucontext_t *uc)
+{
+	mcontext_t *mc = &uc->uc_mcontext;
+
+	memcpy(&mc->mc_fpregs, r, sizeof(*r));
+	mc->mc_flags |= _MC_FP_VALID;
+}
+
+void
+pt_ucontext_to_fpreg(const ucontext_t *uc, struct fpreg *r)
+{
+	const mcontext_t *mc = &uc->uc_mcontext;
+
+	if (mc->mc_flags & _MC_FP_VALID)
+		memcpy(r, &mc->mc_fpregs, sizeof(*r));
+	else
+		memset(r, 0, sizeof(*r));
+
+}
+
+void
+pt_md_init(void)
+{
+}
+
+int
+pt_reg_sstep(struct reg *reg __unused, int step __unused)
+{
+
+	return (0);
+}

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