diff --git a/process_vm.c b/process_vm.c
new file mode 100644
index 0000000..9bd85a8
--- /dev/null
+++ b/process_vm.c
@@ -0,0 +1,54 @@
+#include "defs.h"
+
+int
+sys_process_vm_readv(struct tcb *tcp)
+{
+	if (entering(tcp)) {
+		/* arg 1: pid */
+		tprintf("%ld, ", tcp->u_arg[0]);
+	} else {
+		/* arg 2: local iov */
+		if (syserror(tcp)) {
+			tprintf("%#lx", tcp->u_arg[1]);
+		} else {
+			tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
+		}
+		/* arg 3: local iovcnt */
+		tprintf(", %lu, ", tcp->u_arg[2]);
+		/* arg 4: remote iov */
+		if (syserror(tcp)) {
+			tprintf("%#lx", tcp->u_arg[3]);
+		} else {
+			tprint_iov(tcp, tcp->u_arg[4], tcp->u_arg[3], 0);
+		}
+		/* arg 5: remote iovcnt */
+		/* arg 6: flags */
+		tprintf(", %lu, %lu", tcp->u_arg[4], tcp->u_arg[5]);
+	}
+	return 0;
+}
+
+int
+sys_process_vm_writev(struct tcb *tcp)
+{
+	if (entering(tcp)) {
+		/* arg 1: pid */
+		tprintf("%ld, ", tcp->u_arg[0]);
+		/* arg 2: local iov */
+		if (syserror(tcp))
+			tprintf("%#lx", tcp->u_arg[1]);
+		else
+			tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
+		/* arg 3: local iovcnt */
+		tprintf(", %lu, ", tcp->u_arg[2]);
+		/* arg 4: remote iov */
+		if (syserror(tcp))
+			tprintf("%#lx", tcp->u_arg[3]);
+		else
+			tprint_iov(tcp, tcp->u_arg[4], tcp->u_arg[3], 0);
+		/* arg 5: remote iovcnt */
+		/* arg 6: flags */
+		tprintf(", %lu, %lu", tcp->u_arg[4], tcp->u_arg[5]);
+	}
+	return 0;
+}