sbrk.S revision 1.10
1 1.10 matt /* $NetBSD: sbrk.S,v 1.10 2013/08/01 05:32:33 matt Exp $ */ 2 1.1 bjh21 3 1.1 bjh21 /*- 4 1.1 bjh21 * Copyright (c) 1990 The Regents of the University of California. 5 1.1 bjh21 * All rights reserved. 6 1.1 bjh21 * 7 1.1 bjh21 * Redistribution and use in source and binary forms, with or without 8 1.1 bjh21 * modification, are permitted provided that the following conditions 9 1.1 bjh21 * are met: 10 1.1 bjh21 * 1. Redistributions of source code must retain the above copyright 11 1.1 bjh21 * notice, this list of conditions and the following disclaimer. 12 1.1 bjh21 * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 bjh21 * notice, this list of conditions and the following disclaimer in the 14 1.1 bjh21 * documentation and/or other materials provided with the distribution. 15 1.7 agc * 3. Neither the name of the University nor the names of its contributors 16 1.1 bjh21 * may be used to endorse or promote products derived from this software 17 1.1 bjh21 * without specific prior written permission. 18 1.1 bjh21 * 19 1.1 bjh21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 1.1 bjh21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 1.1 bjh21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 1.1 bjh21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 1.1 bjh21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 1.1 bjh21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 1.1 bjh21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 1.1 bjh21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 1.1 bjh21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 1.1 bjh21 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 1.1 bjh21 * SUCH DAMAGE. 30 1.1 bjh21 * 31 1.1 bjh21 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 32 1.1 bjh21 */ 33 1.1 bjh21 34 1.1 bjh21 #include "SYS.h" 35 1.1 bjh21 36 1.9 nonaka .globl _C_LABEL(_end) 37 1.1 bjh21 38 1.1 bjh21 #ifdef WEAK_ALIAS 39 1.1 bjh21 WEAK_ALIAS(sbrk, _sbrk) 40 1.1 bjh21 #endif 41 1.1 bjh21 42 1.1 bjh21 .data 43 1.1 bjh21 .align 0 44 1.10 matt .globl _C_LABEL(__curbrk) 45 1.10 matt .hidden _C_LABEL(__curbrk) 46 1.10 matt .type _C_LABEL(__curbrk),#object 47 1.10 matt _C_LABEL(__curbrk): 48 1.9 nonaka .word _C_LABEL(_end) 49 1.1 bjh21 50 1.1 bjh21 /* 51 1.1 bjh21 * Change the data segment size 52 1.1 bjh21 */ 53 1.1 bjh21 ENTRY(_sbrk) 54 1.10 matt /* get address or PC offset to __curbrk */ 55 1.10 matt ldr r2, .Lcurbrk 56 1.1 bjh21 #ifdef PIC 57 1.10 matt add r2, pc, r2 58 1.4 matt .L1: 59 1.1 bjh21 #endif 60 1.10 matt 61 1.1 bjh21 /* Get the current brk address */ 62 1.1 bjh21 ldr r1, [r2] 63 1.1 bjh21 64 1.1 bjh21 /* Calculate new value */ 65 1.1 bjh21 mov r3, r0 66 1.1 bjh21 add r0, r0, r1 67 1.2 bjh21 SYSTRAP(break) 68 1.10 matt bcs CERROR 69 1.1 bjh21 70 1.1 bjh21 /* Store new curbrk value */ 71 1.1 bjh21 ldr r0, [r2] 72 1.1 bjh21 add r1, r0, r3 73 1.1 bjh21 str r1, [r2] 74 1.1 bjh21 75 1.1 bjh21 /* Return old curbrk value */ 76 1.8 rearnsha RET 77 1.1 bjh21 78 1.1 bjh21 .align 0 79 1.10 matt .Lcurbrk: 80 1.1 bjh21 #ifdef PIC 81 1.10 matt .word _C_LABEL(__curbrk) - (.L1+4) 82 1.10 matt #else 83 1.10 matt .word _C_LABEL(__curbrk) 84 1.1 bjh21 #endif 85
Indexes created Thu Oct 02 01:09:59 GMT 2025