1/* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * This code is derived from software contributed to Berkeley by 18 * Computer Consoles Inc. 19 */ 20 21#if defined(LIBC_SCCS) && !defined(lint) 22 .asciz "@(#)alloca.s 1.3 (Berkeley) 06/27/88" 23#endif /* LIBC_SCCS and not lint */ 24 25/* like alloc, but automatic automatic free in return */ 26 27#include "DEFS.h" 28 29ENTRY(alloca, 0) 30 moval (sp),r0 # current sp 31 subl2 4(fp),r0 # allocation size 32 andl2 $0xfffffffc,r0 # allignment 33 movl -8(fp),r1 # old pc 34 movl (fp),fp # old fp 35 addl2 $4*4,r0 # reuse space of mscp 36 movl r0,sp # new sp 37 jmp (r1) # funny return 38