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compident.S revision 1.3.2.2 
      1 /* $NetBSD: compident.S,v 1.3.2.2 2014/05/22 11:36:44 yamt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2002, 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Martin Husemann <martin (at) NetBSD.org>.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 
     33 /*
     34  * This file is used to generate a note describing the code model in use by
     35  * the compiler on some architectures where this has consequences for the
     36  * VA layout applied by the kernel. On sparc64 the topdown VA layout can
     37  * only be enabled for processes compiled with -mcmodel=medany or greater,
     38  * but not for processes without this note or -mcmodel=medlow.
     39  *
     40  * The note looks similar to the .note.netbsd.march note used (for example)
     41  * on arm to note the ABI used by the process.
     42  *
     43  * [NOTE HEADER]
     44  *	long		name size
     45  *	long		content size
     46  *	long		note type
     47  *
     48  * [NOTE DATUM]
     49  *	string		code model (for sparc64: medlow, medmid, medany,
     50  *			the embedany model is never PIC, so not used here)
     51  *
     52  * The DATUM fields should be padded out such that their actual (not
     53  * declared) sizes % 4 == 0.
     54  */
     55 
     56 #include "sysident_assym.h"
     57 
     58 	.section .note.netbsd.mcmodel,"aM",@note,3*4+CONTENTLENGTH+ELF_NOTE_MCMODEL_NAMESZ+1
     59 	.p2align 2
     60 
     61 	.long	ELF_NOTE_MCMODEL_NAMESZ
     62 	.long	CONTENTLENGTH
     63 	.long	ELF_NOTE_TYPE_MCMODEL_TAG
     64 	.ascii	"NetBSD\0\0"
     65 	.ascii	CONTENT
     66