1*f3f411daStsutsui/* $NetBSD: brk.S,v 1.18 2010/12/12 09:00:37 tsutsui Exp $ */ 281b108b4Sjonathan 3ae1bfcddSglass/*- 4ae1bfcddSglass * Copyright (c) 1991, 1993 5ae1bfcddSglass * The Regents of the University of California. All rights reserved. 6ae1bfcddSglass * 7ae1bfcddSglass * This code is derived from software contributed to Berkeley by 8ae1bfcddSglass * Ralph Campbell. 9ae1bfcddSglass * 10ae1bfcddSglass * Redistribution and use in source and binary forms, with or without 11ae1bfcddSglass * modification, are permitted provided that the following conditions 12ae1bfcddSglass * are met: 13ae1bfcddSglass * 1. Redistributions of source code must retain the above copyright 14ae1bfcddSglass * notice, this list of conditions and the following disclaimer. 15ae1bfcddSglass * 2. Redistributions in binary form must reproduce the above copyright 16ae1bfcddSglass * notice, this list of conditions and the following disclaimer in the 17ae1bfcddSglass * documentation and/or other materials provided with the distribution. 18eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors 19ae1bfcddSglass * may be used to endorse or promote products derived from this software 20ae1bfcddSglass * without specific prior written permission. 21ae1bfcddSglass * 22ae1bfcddSglass * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23ae1bfcddSglass * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24ae1bfcddSglass * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25ae1bfcddSglass * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26ae1bfcddSglass * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27ae1bfcddSglass * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28ae1bfcddSglass * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29ae1bfcddSglass * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30ae1bfcddSglass * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31ae1bfcddSglass * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32ae1bfcddSglass * SUCH DAMAGE. 33ae1bfcddSglass */ 34ae1bfcddSglass 35946af1bcSjonathan#include "SYS.h" 36946af1bcSjonathan 37ae1bfcddSglass#if defined(LIBC_SCCS) && !defined(lint) 3822882071Smatt#if 0 3922882071Smatt RCSID("from: @(#)brk.s 8.1 (Berkeley) 6/4/93") 4022882071Smatt#else 41*f3f411daStsutsui RCSID("$NetBSD: brk.S,v 1.18 2010/12/12 09:00:37 tsutsui Exp $") 4222882071Smatt#endif 43ae1bfcddSglass#endif /* LIBC_SCCS and not lint */ 44ae1bfcddSglass 456348b7d5Skleink .globl _C_LABEL(__minbrk) 466348b7d5Skleink .globl _C_LABEL(__curbrk) 475af7e7a9Skleink .globl _C_LABEL(_end) 483b5d18b5Smycroft 4903f996bdSkleink#ifdef WEAK_ALIAS 5003f996bdSkleinkWEAK_ALIAS(brk, _brk) 5103f996bdSkleink#endif 5203f996bdSkleink 533b5d18b5Smycroft .data 546348b7d5Skleink_C_LABEL(__minbrk): 5522882071Smatt PTR_WORD _C_LABEL(_end) 563b5d18b5Smycroft .text 57ae1bfcddSglass 5803f996bdSkleinkLEAF(_brk) 5922882071Smatt PIC_PROLOGUE(_brk) 6022882071Smatt PTR_LA t0, _C_LABEL(__minbrk) 6122882071Smatt PTR_L v0, 0(t0) 62de9e80b4Skleink bgeu a0, v0, 1f 63ae1bfcddSglass move a0, v0 # dont allow break < minbrk 64de9e80b4Skleink1: 653b5d18b5Smycroft li v0, SYS_break 66ae1bfcddSglass syscall 67de9e80b4Skleink bne a3, zero, 2f 68*f3f411daStsutsui PTR_LA t0, _C_LABEL(__curbrk) 6922882071Smatt PTR_S a0, 0(t0) 70ae1bfcddSglass move v0, zero 7122882071Smatt PIC_RETURN() 72de9e80b4Skleink2: 7322882071Smatt PIC_TAILCALL(__cerror) 745d5afc14SsimonbEND(_brk) 75