1! 2! CDDL HEADER START 3! 4! The contents of this file are subject to the terms of the 5! Common Development and Distribution License, Version 1.0 only 6! (the "License"). You may not use this file except in compliance 7! with the License. 8! 9! You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10! or http://www.opensolaris.org/os/licensing. 11! See the License for the specific language governing permissions 12! and limitations under the License. 13! 14! When distributing Covered Code, include this CDDL HEADER in each 15! file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16! If applicable, add the following below this CDDL HEADER, with the 17! fields enclosed by brackets "[]" replaced with your own identifying 18! information: Portions Copyright [yyyy] [name of copyright owner] 19! 20! CDDL HEADER END 21! 22! "%Z%%M% %I% %E% SMI" 23! Copyright (c) 1986 by Sun Microsystems, Inc. 24! 25! .seg "text" 26 27 .file "sbrk.s" 28 29#include "SYS.h" 30#include <sys/syscall.h> 31 32#define ALIGNSIZE 8 33 34 .global .curbrk 35 .type .curbrk,#object 36 .size .curbrk,4 37 38 .global end 39 .section ".data" 40 .align 4 41.curbrk: 42 .word end 43 44 ENTRY(sbrk) 45 add %o0, (ALIGNSIZE-1), %o0 ! round up request to align size 46 andn %o0, (ALIGNSIZE-1), %o0 47#ifdef PIC 48 PIC_SETUP(o5) 49 ld [%o5 + .curbrk], %g1 50 ld [%g1], %o3 51#else 52 sethi %hi(.curbrk), %o2 53 ld [%o2 + %lo(.curbrk)], %o3 54#endif 55 add %o3, (ALIGNSIZE-1), %o3 ! round up .curbrk to align size 56 andn %o3, (ALIGNSIZE-1), %o3 57 add %o3, %o0, %o0 ! new break setting = request + .curbrk 58 mov %o0, %o4 ! save it 59 mov SYS_brk, %g1 60 t 8 61 CERROR(o5) 62#ifdef PIC 63 PIC_SETUP(o5) 64 ld [%o5 + .curbrk], %g1 65 st %o4, [%g1] 66#else 67 st %o4, [%o2 + %lo(.curbrk)] ! store new break in .curbrk 68#endif 69 retl 70 mov %o3, %o0 ! return old break 71 SET_SIZE(sbrk) 72