brk.S revision 1.3
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Ralph Campbell. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include "SYS.h" 34 35#if defined(SYSLIBC_SCCS) 36 .text 37 .asciz "$OpenBSD: brk.S,v 1.3 2004/09/09 16:14:02 pefo Exp $" 38#endif /* SYSLIBC_SCCS */ 39 40 .globl minbrk 41 .globl curbrk 42 43 .data 44minbrk: PTR_VAL _C_LABEL(end) 45 .text 46 47FRAMESZ= MKFSIZ(1,1) 48GPOFF= FRAMESZ-2*REGSZ 49 50LEAF(brk, FRAMESZ) 51 PTR_SUBU sp, FRAMESZ 52 SETUP_GP64(GPOFF, brk) 53 .set reorder 54 PTR_L v0, minbrk 55 bgtu a0, v0, 1f 56 57 move a0, v0 # dont allow break < minbrk 581: 59 li v0, SYS_break 60 syscall 61 bne a3, zero, 2f 62 PTR_S a0, curbrk 63 move v0, zero 64 RESTORE_GP64 65 PTR_ADDU sp, FRAMESZ 66 j ra 672: 68 LA t9, _C_LABEL(cerror) 69 RESTORE_GP64 70 PTR_ADDU sp, FRAMESZ 71 jr t9 72END(brk) 73 74FRAMESZ= MKFSIZ(1,1) 75GPOFF= FRAMESZ-2*REGSZ 76 77LEAF(_brk, FRAMESZ) 78 PTR_SUBU sp, FRAMESZ 79 SETUP_GP64(GPOFF, brk) 80 .set reorder 81 li v0, SYS_break 82 syscall 83 bne a3, zero, 1f 84 PTR_S a0, curbrk 85 move v0, zero 86 RESTORE_GP64 87 PTR_ADDU sp, FRAMESZ 88 j ra 891: 90 LA t9, _C_LABEL(cerror) 91 RESTORE_GP64 92 PTR_ADDU sp, FRAMESZ 93 jr t9 94END(_brk) 95