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diff --git a/libipt/internal/include/pt_last_ip.h b/libipt/internal/include/pt_last_ip.h
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+++ b/libipt/internal/include/pt_last_ip.h
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+/*
+ * Copyright (c) 2013-2019, Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * 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.
+ *  * Neither the name of Intel Corporation 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#ifndef PT_LAST_IP_H
+#define PT_LAST_IP_H
+
+#include <stdint.h>
+
+struct pt_packet_ip;
+struct pt_config;
+
+
+/* Keeping track of the last-ip in Intel PT packets. */
+struct pt_last_ip {
+	/* The last IP. */
+	uint64_t ip;
+
+	/* Flags governing the handling of IP updates and queries:
+	 *
+	 * - we have seen an IP update.
+	 */
+	uint32_t have_ip:1;
+	/* - the IP has been suppressed in the last update. */
+	uint32_t suppressed:1;
+};
+
+
+/* Initialize (or reset) the last-ip. */
+extern void pt_last_ip_init(struct pt_last_ip *last_ip);
+
+/* Query the last-ip.
+ *
+ * If @ip is not NULL, provides the last-ip in @ip on success.
+ *
+ * Returns zero on success.
+ * Returns -pte_internal if @last_ip is NULL.
+ * Returns -pte_noip if there is no last-ip.
+ * Returns -pte_ip_suppressed if the last-ip has been suppressed.
+ */
+extern int pt_last_ip_query(uint64_t *ip, const struct pt_last_ip *last_ip);
+
+/* Update last-ip.
+ *
+ * Updates @last_ip based on @packet and, if non-null, @config.
+ *
+ * Returns zero on success.
+ * Returns -pte_internal if @last_ip or @packet is NULL.
+ * Returns -pte_bad_packet if @packet appears to be corrupted.
+ */
+extern int pt_last_ip_update_ip(struct pt_last_ip *last_ip,
+				const struct pt_packet_ip *packet,
+				const struct pt_config *config);
+
+#endif /* PT_LAST_IP_H */