1/* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * %sccs.include.redist.c% 10 * 11 * from: $Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp $ 12 */ 13 14#if defined(LIBC_SCCS) && !defined(lint) 15 .asciz "@(#)sbrk.s 8.1 (Berkeley) 06/04/93" 16#endif /* LIBC_SCCS and not lint */ 17 18#include "SYS.h" 19 20 .globl _end 21 .globl curbrk 22 23 .data 24curbrk: .long _end 25 .text 26 27ENTRY(sbrk) 28 sethi %hi(curbrk), %o2 29 ld [%o2 + %lo(curbrk)], %o3 ! %o3 = old break 30 add %o3, %o0, %o4 ! %o4 = new break 31 mov %o4, %o0 ! copy for syscall 32 mov SYS_break, %g1 33 t ST_SYSCALL ! break(new_break) 34 bcc,a 1f ! if success, 35 mov %o3, %o0 ! set return value 36 ERROR() 371: 38 retl ! and update curbrk 39 st %o4, [%o2 + %lo(curbrk)] 40