sbrk.S revision 1.2.2.1
1 1.2.2.1 nathanw /* $NetBSD: sbrk.S,v 1.2.2.1 2001/10/08 20:17:10 nathanw 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 1.1 bjh21 * 3. All advertising materials mentioning features or use of this software 16 1.1 bjh21 * must display the following acknowledgement: 17 1.1 bjh21 * This product includes software developed by the University of 18 1.1 bjh21 * California, Berkeley and its contributors. 19 1.1 bjh21 * 4. Neither the name of the University nor the names of its contributors 20 1.1 bjh21 * may be used to endorse or promote products derived from this software 21 1.1 bjh21 * without specific prior written permission. 22 1.1 bjh21 * 23 1.1 bjh21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 bjh21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 bjh21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 bjh21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 bjh21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 bjh21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 bjh21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 bjh21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 bjh21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 bjh21 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 bjh21 * SUCH DAMAGE. 34 1.1 bjh21 * 35 1.1 bjh21 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 36 1.1 bjh21 */ 37 1.1 bjh21 38 1.1 bjh21 #include "SYS.h" 39 1.1 bjh21 40 1.1 bjh21 .globl _C_LABEL(end) 41 1.1 bjh21 42 1.1 bjh21 #ifdef WEAK_ALIAS 43 1.1 bjh21 WEAK_ALIAS(sbrk, _sbrk) 44 1.1 bjh21 #endif 45 1.1 bjh21 46 1.1 bjh21 .data 47 1.1 bjh21 .align 0 48 1.2.2.1 nathanw .globl CURBRK 49 1.2.2.1 nathanw .type CURBRK,#object 50 1.2.2.1 nathanw CURBRK: 51 1.1 bjh21 .word _C_LABEL(end) 52 1.1 bjh21 53 1.1 bjh21 /* 54 1.1 bjh21 * Change the data segment size 55 1.1 bjh21 */ 56 1.1 bjh21 ENTRY(_sbrk) 57 1.1 bjh21 #ifdef PIC 58 1.1 bjh21 /* Setup the GOT */ 59 1.1 bjh21 ldr r3, Lgot 60 1.1 bjh21 add r3, pc, r3 61 1.2.2.1 nathanw .L1: 62 1.1 bjh21 ldr r2, Lcurbrk 63 1.1 bjh21 ldr r2, [r3, r2] 64 1.1 bjh21 #else 65 1.1 bjh21 ldr r2, Lcurbrk 66 1.1 bjh21 #endif 67 1.1 bjh21 /* Get the current brk address */ 68 1.1 bjh21 ldr r1, [r2] 69 1.1 bjh21 70 1.1 bjh21 /* Calculate new value */ 71 1.1 bjh21 mov r3, r0 72 1.1 bjh21 add r0, r0, r1 73 1.2 bjh21 SYSTRAP(break) 74 1.2.2.1 nathanw bcs PIC_SYM(CERROR, PLT) 75 1.1 bjh21 76 1.1 bjh21 /* Store new curbrk value */ 77 1.1 bjh21 ldr r0, [r2] 78 1.1 bjh21 add r1, r0, r3 79 1.1 bjh21 str r1, [r2] 80 1.1 bjh21 81 1.1 bjh21 /* Return old curbrk value */ 82 1.1 bjh21 #ifdef __APCS_26__ 83 1.1 bjh21 movs r15, r14 84 1.1 bjh21 #else 85 1.1 bjh21 mov r15, r14 86 1.1 bjh21 #endif 87 1.1 bjh21 88 1.1 bjh21 .align 0 89 1.1 bjh21 #ifdef PIC 90 1.1 bjh21 Lgot: 91 1.2.2.1 nathanw .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (.L1+4)) 92 1.1 bjh21 #endif 93 1.1 bjh21 Lcurbrk: 94 1.2.2.1 nathanw .word PIC_SYM(CURBRK, GOT) 95
Indexes created Thu Oct 02 01:09:59 GMT 2025