diff --git a/usr.bin/kdump/kdump.h b/usr.bin/kdump/kdump.h
new file mode 100644
--- /dev/null
+++ b/usr.bin/kdump/kdump.h
@@ -0,0 +1,79 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  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.
+ * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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 __KDUMP_H__
+#define __KDUMP_H__
+
+extern bool decimal, fancy, resolv;
+
+#define	print_number64(first,i,n,c) do {				\
+	uint64_t __v;							\
+									\
+	if (quad_align && (((ptrdiff_t)((i) - (first))) & 1) == 1) {	\
+		(i)++;							\
+		(n)--;							\
+	}								\
+	if (quad_slots == 2)						\
+		__v = (uint64_t)(uint32_t)(i)[0] |			\
+		    ((uint64_t)(uint32_t)(i)[1]) << 32;			\
+	else								\
+		__v = (uint64_t)*(i);					\
+	if (decimal)							\
+		printf("%c%jd", (c), (intmax_t)__v);			\
+	else								\
+		printf("%c%#jx", (c), (uintmax_t)__v);			\
+	(i) += quad_slots;						\
+	(n) -= quad_slots;						\
+	(c) = ',';							\
+} while (0)
+
+#define print_number(i,n,c) do {					\
+	if (decimal)							\
+		printf("%c%jd", c, (intmax_t)*i);			\
+	else								\
+		printf("%c%#jx", c, (uintmax_t)(u_register_t)*i);	\
+	i++;								\
+	n--;								\
+	c = ',';							\
+} while (0)
+
+void	print_integer_arg(const char *(*decoder)(int), int value);
+void	print_integer_arg_valid(const char *(*decoder)(int), int value);
+void	print_mask_arg(bool (*decoder)(FILE *, int, int *), int value);
+void	print_mask_arg0(bool (*decoder)(FILE *, int, int *), int value);
+void	print_mask_arg32(bool (*decoder)(FILE *, uint32_t, uint32_t *),
+	    uint32_t value);
+void	print_mask_argul(bool (*decoder)(FILE *, u_long, u_long *),
+	    u_long value);
+bool	print_mask_arg_part(bool (*decoder)(FILE *, int, int *),
+	    int value, int *rem);
+
+#endif /* !__KDUMP_H__ */
diff --git a/usr.bin/kdump/kdump.c b/usr.bin/kdump/kdump.c
--- a/usr.bin/kdump/kdump.c
+++ b/usr.bin/kdump/kdump.c
@@ -90,6 +90,7 @@
 #include <unistd.h>
 #include <vis.h>
 #include "ktrace.h"
+#include "kdump.h"
 
 #ifdef WITH_CASPER
 #include <libcasper.h>
@@ -130,8 +131,8 @@
 #define	TIMESTAMP_ELAPSED	0x2
 #define	TIMESTAMP_RELATIVE	0x4
 
-static bool abiflag, decimal, fancy = true, resolv, suppressdata, syscallno,
-    tail, threads;
+bool decimal, fancy = true, resolv;
+static bool abiflag, suppressdata, syscallno, tail, threads;
 static int timestamp, maxdata;
 static const char *tracefile = DEF_TRACEFILE;
 static struct ktr_header ktr_header;
@@ -139,37 +140,6 @@
 #define TIME_FORMAT	"%b %e %T %Y"
 #define eqs(s1, s2)	(strcmp((s1), (s2)) == 0)
 
-#define	print_number64(first,i,n,c) do {				\
-	uint64_t __v;							\
-									\
-	if (quad_align && (((ptrdiff_t)((i) - (first))) & 1) == 1) {	\
-		(i)++;							\
-		(n)--;							\
-	}								\
-	if (quad_slots == 2)						\
-		__v = (uint64_t)(uint32_t)(i)[0] |			\
-		    ((uint64_t)(uint32_t)(i)[1]) << 32;			\
-	else								\
-		__v = (uint64_t)*(i);					\
-	if (decimal)							\
-		printf("%c%jd", (c), (intmax_t)__v);			\
-	else								\
-		printf("%c%#jx", (c), (uintmax_t)__v);			\
-	(i) += quad_slots;						\
-	(n) -= quad_slots;						\
-	(c) = ',';							\
-} while (0)
-
-#define print_number(i,n,c) do {					\
-	if (decimal)							\
-		printf("%c%jd", c, (intmax_t)*i);			\
-	else								\
-		printf("%c%#jx", c, (uintmax_t)(u_register_t)*i);	\
-	i++;								\
-	n--;								\
-	c = ',';							\
-} while (0)
-
 struct proc_info
 {
 	TAILQ_ENTRY(proc_info)	info;
@@ -225,7 +195,7 @@
 }
 #endif	/* WITH_CASPER */
 
-static void
+void
 print_integer_arg(const char *(*decoder)(int), int value)
 {
 	const char *str;
@@ -242,7 +212,7 @@
 }
 
 /* Like print_integer_arg but unknown values are treated as valid. */
-static void
+void
 print_integer_arg_valid(const char *(*decoder)(int), int value)
 {
 	const char *str;
@@ -258,7 +228,7 @@
 	}
 }
 
-static bool
+bool
 print_mask_arg_part(bool (*decoder)(FILE *, int, int *), int value, int *rem)
 {
 
@@ -266,7 +236,7 @@
 	return (decoder(stdout, value, rem));
 }
 
-static void
+void
 print_mask_arg(bool (*decoder)(FILE *, int, int *), int value)
 {
 	bool invalid;
@@ -278,7 +248,7 @@
 		printf("<invalid>%u", rem);
 }
 
-static void
+void
 print_mask_arg0(bool (*decoder)(FILE *, int, int *), int value)
 {
 	bool invalid;
@@ -329,7 +299,7 @@
 		printf("<invalid>%u", rem);
 }
 
-static void
+void
 print_mask_arg32(bool (*decoder)(FILE *, uint32_t, uint32_t *), uint32_t value)
 {
 	bool invalid;
@@ -342,7 +312,7 @@
 		printf("<invalid>%u", rem);
 }
 
-static void
+void
 print_mask_argul(bool (*decoder)(FILE *, u_long, u_long *), u_long value)
 {
 	bool invalid;