Function redzone_setup

freebsd/vm/redzone.c:99–123

* Set redzones and remember allocation backtrace. */

 * Set redzones and remember allocation backtrace.
 */
void *
redzone_setup(caddr_t raddr, u_long nsize)
{
	struct stack st;
	caddr_t haddr, faddr;

	atomic_add_long(&redzone_extra_mem, redzone_size_ntor(nsize) - nsize);

	haddr = raddr + redzone_roundup(nsize) - REDZONE_HSIZE;
	faddr = haddr + REDZONE_HSIZE + nsize;

	/* Redzone header. */
	stack_save(&st);
	bcopy(&st, haddr, sizeof(st));
	haddr += sizeof(st);
	bcopy(&nsize, haddr, sizeof(nsize));
	haddr += sizeof(nsize);
	memset(haddr, 0x42, REDZONE_CHSIZE);
	haddr += REDZONE_CHSIZE;

	/* Redzone footer. */
	memset(faddr, 0x42, REDZONE_CFSIZE);

	return (haddr);
}

/*
 * Verify redzones.