t_dtrace_trapframe
if ((tf = curthread->t_dtrace_trapframe) == NULL) {
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;
if (td->t_dtrace_trapframe != NULL) {
struct trapframe *tf = td->t_dtrace_trapframe;
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;
td->t_dtrace_trapframe = frame;
td->t_dtrace_trapframe = NULL;