kstack_end
if (kstack_end((void *)frame->fp) || frame->fp & 0x3)
while (!kstack_end(ksp)) {
while (!kstack_end(sp)) {
while (!kstack_end(sp)) {
while (!kstack_end(sp)) {
(!kstack_end(frameinfo->fp) &&
while (!kstack_end(stack)) {
while (!kstack_end(stack)) {
while (!kstack_end(ksp)) {
while (!kstack_end(sp)) {
if (kstack_end(stack))