diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -931,6 +931,17 @@
 	printf("current process		= %d (%s)\n",
 	    curproc->p_pid, curthread->td_name);
 
+	printf("rdi: %16lx rsi: %16lx rdx: %16lx\n", frame->tf_rdi,
+	    frame->tf_rsi, frame->tf_rdx);
+	printf("rcx: %16lx  r8: %16lx  r9: %16lx\n", frame->tf_rcx,
+	    frame->tf_r8, frame->tf_r9);
+	printf("rax: %16lx rbx: %16lx rbp: %16lx\n", frame->tf_rax,
+	    frame->tf_rbx, frame->tf_rbp);
+	printf("r10: %16lx r11: %16lx r12: %16lx\n", frame->tf_r10,
+	    frame->tf_r11, frame->tf_r12);
+	printf("r13: %16lx r14: %16lx r15: %16lx\n", frame->tf_r13,
+	    frame->tf_r14, frame->tf_r15);
+
 #ifdef KDB
 	if (debugger_on_trap) {
 		kdb_why = KDB_WHY_TRAP;