_STACKALIGNBYTES
stack->sp = base + size - (_STACKALIGNBYTES+1) - rnd;
rnd &= ~_STACKALIGNBYTES;
stack->sp = base + thread->attr.stack_size - (_STACKALIGNBYTES+1) - rnd;
(arc4random() & PAGE_MASK & ~_STACKALIGNBYTES);
(arc4random() & PAGE_MASK & ~_STACKALIGNBYTES);
frame = (tos - fsize) & ~_STACKALIGNBYTES;
~_STACKALIGNBYTES;
~_STACKALIGNBYTES;
~_STACKALIGNBYTES;
((USPACE - sizeof(struct trapframe)) & ~_STACKALIGNBYTES);
(arc4random() & PAGE_MASK & ~_STACKALIGNBYTES);
dp = (char *)(((long)dp + _STACKALIGNBYTES) & ~_STACKALIGNBYTES);
sgap = (sgap + _STACKALIGNBYTES) & ~_STACKALIGNBYTES;
len = (len + _STACKALIGNBYTES) &~ _STACKALIGNBYTES;