VM86_STACK_SPACE
ASSYM(VM86_STACK_SPACE, VM86_STACK_SPACE);
VM86_STACK_SPACE;
common_tss0.tss_esp0 = (vm_offset_t)thread0.td_pcb - VM86_STACK_SPACE;
VM86_STACK_SPACE);
VM86_STACK_SPACE);
VM86_STACK_SPACE) - 1;
addl $VM86_STACK_SPACE, %ecx