diff --git a/seccomp.c b/seccomp.c
new file mode 100644
index 0000000..8adaac5
--- /dev/null
+++ b/seccomp.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "defs.h"
+
+#ifdef HAVE_LINUX_SECCOMP_H
+# include <linux/seccomp.h>
+#endif
+
+#ifndef SECCOMP_SET_MODE_STRICT
+# define SECCOMP_SET_MODE_STRICT 1
+#endif
+#ifndef SECCOMP_SET_MODE_FILTER
+# define SECCOMP_SET_MODE_FILTER 1
+#endif
+#include "xlat/seccomp_ops.h"
+
+#ifndef SECCOMP_FILTER_FLAG_TSYNC
+# define SECCOMP_FILTER_FLAG_TSYNC 1
+#endif
+#include "xlat/seccomp_filter_flags.h"
+
+#ifdef HAVE_LINUX_FILTER_H
+# include <linux/filter.h>
+# include "xlat/bpf_class.h"
+# include "xlat/bpf_miscop.h"
+# include "xlat/bpf_mode.h"
+# include "xlat/bpf_op_alu.h"
+# include "xlat/bpf_op_jmp.h"
+# include "xlat/bpf_rval.h"
+# include "xlat/bpf_size.h"
+# include "xlat/bpf_src.h"
+
+# ifndef SECCOMP_RET_ACTION
+#  define SECCOMP_RET_ACTION 0x7fff0000U
+# endif
+# include "xlat/seccomp_ret_action.h"
+#endif
+
+struct bpf_filter {
+	uint16_t code;
+	uint8_t jt;
+	uint8_t jf;
+	uint32_t k;
+};
+
+#ifdef HAVE_LINUX_FILTER_H
+
+static void
+decode_bpf_code(uint16_t code)
+{
+	uint16_t i = code & ~BPF_CLASS(code);
+
+	printxval(bpf_class, BPF_CLASS(code), "BPF_???");
+	switch (BPF_CLASS(code)) {
+		case BPF_LD:
+		case BPF_LDX:
+			tprints(" | ");
+			printxval(bpf_size, BPF_SIZE(code), "BPF_???");
+			tprints(" | ");
+			printxval(bpf_mode, BPF_MODE(code), "BPF_???");
+			break;
+		case BPF_ST:
+		case BPF_STX:
+			if (i)
+				tprintf(" | %#x /* %s */", i, "BPF_???");
+			break;
+		case BPF_ALU:
+			tprints(" | ");
+			printxval(bpf_src, BPF_SRC(code), "BPF_???");
+			tprints(" | ");
+			printxval(bpf_op_alu, BPF_OP(code), "BPF_???");
+			break;
+		case BPF_JMP:
+			tprints(" | ");
+			printxval(bpf_src, BPF_SRC(code), "BPF_???");
+			tprints(" | ");
+			printxval(bpf_op_jmp, BPF_OP(code), "BPF_???");
+			break;
+		case BPF_RET:
+			tprints(" | ");
+			printxval(bpf_rval, BPF_RVAL(code), "BPF_???");
+			i &= ~BPF_RVAL(code);
+			if (i)
+				tprintf(" | %#x /* %s */", i, "BPF_???");
+			break;
+		case BPF_MISC:
+			tprints(" | ");
+			printxval(bpf_miscop, BPF_MISCOP(code), "BPF_???");
+			i &= ~BPF_MISCOP(code);
+			if (i)
+				tprintf(" | %#x /* %s */", i, "BPF_???");
+			break;
+	}
+
+}
+
+static void
+decode_bpf_stmt(const struct bpf_filter *filter)
+{
+#ifdef HAVE_LINUX_FILTER_H
+	tprints("BPF_STMT(");
+	decode_bpf_code(filter->code);
+	tprints(", ");
+	if (BPF_CLASS(filter->code) == BPF_RET) {
+		unsigned int action = SECCOMP_RET_ACTION & filter->k;
+		unsigned int data = filter->k & ~action;
+
+		printxval(seccomp_ret_action, action, "SECCOMP_RET_???");
+		if (data)
+			tprintf(" | %#x)", data);
+		else
+			tprints(")");
+	} else {
+		tprintf("%#x)", filter->k);
+	}
+#else
+	tprintf("BPF_STMT(%#x, %#x)", filter->code, filter->k);
+#endif /* HAVE_LINUX_FILTER_H */
+}
+
+static void
+decode_bpf_jump(const struct bpf_filter *filter)
+{
+#ifdef HAVE_LINUX_FILTER_H
+	tprints("BPF_JUMP(");
+	decode_bpf_code(filter->code);
+	tprintf(", %#x, %#x, %#x)",
+		filter->k, filter->jt, filter->jf);
+#else
+	tprintf("BPF_JUMP(%#x, %#x, %#x, %#x)",
+		filter->code, filter->k, filter->jt, filter->jf);
+#endif /* HAVE_LINUX_FILTER_H */
+}
+
+static void
+decode_filter(const struct bpf_filter *filter)
+{
+	if (filter->jt || filter->jf)
+		decode_bpf_jump(filter);
+	else
+		decode_bpf_stmt(filter);
+}
+
+#endif /* HAVE_LINUX_FILTER_H */
+
+#ifndef BPF_MAXINSNS
+# define BPF_MAXINSNS 4096
+#endif
+
+static void
+decode_fprog(struct tcb *tcp, unsigned short len, unsigned long addr)
+{
+	if (!len || abbrev(tcp)) {
+		tprintf("{len = %u, filter = %#lx}", len, addr);
+	} else {
+		unsigned int i = 0;
+
+		tprints("[");
+		while (i < len && i < BPF_MAXINSNS) {
+			struct bpf_filter filter;
+
+			if (umove(tcp, addr, &filter) < 0)
+				break;
+			if (i)
+				tprints(", ");
+			decode_filter(&filter);
+
+			addr += sizeof(filter);
+			++i;
+		}
+		if (i < len)
+			tprints("...");
+		tprints("]");
+	}
+}
+
+void
+print_seccomp_filter(struct tcb *tcp, unsigned long addr)
+{
+	if (addr) {
+#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
+		if (current_wordsize == 4) {
+			struct {
+				unsigned short len;
+				uint32_t filter;
+			} fprog;
+			if (umove(tcp, addr, &fprog) < 0)
+				tprintf("%#lx", addr);
+			else
+				decode_fprog(tcp, fprog.len, fprog.filter);
+		} else {
+#endif
+			struct {
+				unsigned short len;
+				unsigned long filter;
+			} fprog;
+			if (umove(tcp, addr, &fprog) < 0)
+				tprintf("%#lx", addr);
+			else
+				decode_fprog(tcp, fprog.len, fprog.filter);
+#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
+		}
+#endif
+	} else {
+		tprints("NULL");
+	}
+}
+
+static void
+decode_seccomp_set_mode_strict(unsigned int flags, unsigned long addr)
+{
+	tprintf("%u, ", flags);
+	if (addr)
+		tprintf("%#lx", addr);
+	else
+		tprints("NULL");
+}
+
+int
+sys_seccomp(struct tcb *tcp)
+{
+	if (entering(tcp)) {
+		unsigned int op = tcp->u_arg[0];
+
+		printxval(seccomp_ops, op, "SECCOMP_SET_MODE_???");
+		tprints(", ");
+
+		if (op == SECCOMP_SET_MODE_FILTER) {
+			printflags(seccomp_filter_flags, tcp->u_arg[1],
+				   "SECCOMP_FILTER_FLAG_???");
+			tprints(", ");
+			print_seccomp_filter(tcp, tcp->u_arg[2]);
+		} else {
+			decode_seccomp_set_mode_strict(tcp->u_arg[1],
+						       tcp->u_arg[2]);
+		}
+	}
+	return 0;
+}