NetBSD/lib/csu/mips/dot_init.h

/* $NetBSD: dot_init.h,v 1.2 2001/08/16 03:44:46 simonb Exp $ */

/*-
 * Copyright (c) 2001 Ross Harvey
 * Copyright (c) 2001 Simon Burge
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */

/*
 * These must be extern to avoid warnings ("declared static but never defined")
 * However, only the declaration is extern, the actually __asm() defines them
 * as static.
 */
#define	INIT_FALLTHRU_DECL void init_fallthru(void)
#define	FINI_FALLTHRU_DECL void fini_fallthru(void)

#define	INIT_FALLTHRU()	init_fallthru()
#define	FINI_FALLTHRU()	fini_fallthru()

#define	ra	"$31"

/*
 *   The stack frame is 16 bytes long; big enough to store the GP saved
 *   by .cpload (at offset 0) and the caller's RA (at offset 8),
 *   allowing for 64bit addresses.
 */
#define	MD_SECTION_PROLOGUE(sect, entry_pt)		\
		__asm (					\
		".section "#sect",\"ax\",@progbits	\n"\
		#entry_pt":				\n"\
		"	subu	$sp,$sp,16		\n"\
		"	sw	"ra",8($sp)		\n"\
		"	/* fall thru */			\n"\
		".previous")

#define	MD_SECTION_EPILOGUE(sect)			\
		__asm (					\
		".section "#sect",\"ax\",@progbits	\n"\
		"	lw	"ra",8($sp)		\n"\
		"	.set	noreorder		\n"\
		"	j	"ra"			\n"\
		"	addu	$sp,$sp,16		\n"\
		"	.set	reorder			\n"\
		".previous")

#define	MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, init_fallthru)
#define	MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, fini_fallthru)

#define	MD_INIT_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.init)
#define	MD_FINI_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.fini)