REDZONE_CHSIZE
memset(haddr, 0x42, REDZONE_CHSIZE);
haddr += REDZONE_CHSIZE;
for (i = 0; i < REDZONE_CHSIZE; i++, haddr++) {
#define REDZONE_HSIZE (sizeof(struct stack) + sizeof(u_long) + REDZONE_CHSIZE)
bcopy(naddr - REDZONE_CHSIZE - sizeof(u_long), &nsize, sizeof(nsize));