USPACE_SVC_STACK_TOP
USPACE_SVC_STACK_TOP;
pcb->pcb_un.un_32.pcb32_sp = (u_int)p2->p_addr + USPACE_SVC_STACK_TOP;
#define USPACE_SVC_STACK_BOTTOM (USPACE_SVC_STACK_TOP - 0x1000)
return(kernelstack.pv_va + USPACE_SVC_STACK_TOP);