2008-04-29 00:22:51 +04:00
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/* $NetBSD: dot_init.h,v 1.7 2008/04/28 20:22:54 martin Exp $ */
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Reorganization of crtbegin/crtend.
o Primary mod: alpha and i386 code for .init and .fini section fallthroughs
o Actual fallthru is not yet enabled, see csu/{alpha,i386_elf}/Makefile
o When enabled, should fix bin/12865 & should fix at least one WINE bug,
see http://www.winehq.com/hypermail/wine-devel/2001/05/0021.html
o Also, removed the function pointer hack put in to prevent gcc from
incorrectly attempting to do short calls over section boundaries,
on some architectures, rather, simply simply move ctors() and dtors()
into .init and .fini.
Other notes.
o Our crtbegin.c and crtend.c were completely in C, despite
the fact that .init and .fini section fallthroughs require machine code.
These modules implement the gnu ctors/dtors mechanism directly, eliminating
in part the need for the elf .init/.fini section fallthrough. However,
if we ever want to use the gnu-provided constructor support, we need to
do the fallthrough, at least one program (WINE) apparently uses the
feature independently, and other compilers may depend on the mechanism.
o It is amusing that the previous NetBSD _init() and _fini() were put
into the .init and .fini sections, because nothing is gained over
plain .text if they don't fall through. Cargo cult!
o Other elf ports will need to copy the alpha and i386 example mods.
2001-05-12 02:44:14 +04:00
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/*-
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* Copyright (c) 2001 Ross Harvey
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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#include <machine/asm.h>
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#define ASM_SETUP "sp = $30; gp = $29; pv = $27; ra = $26 \n"
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#define MD_SECTION_PROLOGUE(sect, entry_pt) \
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__asm ( \
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ASM_SETUP \
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".section "#sect",\"ax\",@progbits \n"\
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2006-10-19 20:47:38 +04:00
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".global "#entry_pt" \n"\
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Reorganization of crtbegin/crtend.
o Primary mod: alpha and i386 code for .init and .fini section fallthroughs
o Actual fallthru is not yet enabled, see csu/{alpha,i386_elf}/Makefile
o When enabled, should fix bin/12865 & should fix at least one WINE bug,
see http://www.winehq.com/hypermail/wine-devel/2001/05/0021.html
o Also, removed the function pointer hack put in to prevent gcc from
incorrectly attempting to do short calls over section boundaries,
on some architectures, rather, simply simply move ctors() and dtors()
into .init and .fini.
Other notes.
o Our crtbegin.c and crtend.c were completely in C, despite
the fact that .init and .fini section fallthroughs require machine code.
These modules implement the gnu ctors/dtors mechanism directly, eliminating
in part the need for the elf .init/.fini section fallthrough. However,
if we ever want to use the gnu-provided constructor support, we need to
do the fallthrough, at least one program (WINE) apparently uses the
feature independently, and other compilers may depend on the mechanism.
o It is amusing that the previous NetBSD _init() and _fini() were put
into the .init and .fini sections, because nothing is gained over
plain .text if they don't fall through. Cargo cult!
o Other elf ports will need to copy the alpha and i386 example mods.
2001-05-12 02:44:14 +04:00
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#entry_pt": \n"\
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" ldgp gp, 0(pv) \n"\
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" lda sp, -32(sp) \n"\
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" stq ra, 0(sp) \n"\
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" stq gp, 8(sp) \n"\
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" .align 5 \n"\
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" /* fall thru */ \n"\
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".previous")
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#define MD_SECTION_EPILOGUE(sect) \
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__asm ( \
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ASM_SETUP \
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".section "#sect",\"ax\",@progbits \n"\
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" ldq gp, 8(sp) \n"\
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" ldq ra, 0(sp) \n"\
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" lda sp, 32(sp) \n"\
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" RET \n"\
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".previous")
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2006-10-19 20:47:38 +04:00
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#define MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, _init)
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#define MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, _fini)
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Reorganization of crtbegin/crtend.
o Primary mod: alpha and i386 code for .init and .fini section fallthroughs
o Actual fallthru is not yet enabled, see csu/{alpha,i386_elf}/Makefile
o When enabled, should fix bin/12865 & should fix at least one WINE bug,
see http://www.winehq.com/hypermail/wine-devel/2001/05/0021.html
o Also, removed the function pointer hack put in to prevent gcc from
incorrectly attempting to do short calls over section boundaries,
on some architectures, rather, simply simply move ctors() and dtors()
into .init and .fini.
Other notes.
o Our crtbegin.c and crtend.c were completely in C, despite
the fact that .init and .fini section fallthroughs require machine code.
These modules implement the gnu ctors/dtors mechanism directly, eliminating
in part the need for the elf .init/.fini section fallthrough. However,
if we ever want to use the gnu-provided constructor support, we need to
do the fallthrough, at least one program (WINE) apparently uses the
feature independently, and other compilers may depend on the mechanism.
o It is amusing that the previous NetBSD _init() and _fini() were put
into the .init and .fini sections, because nothing is gained over
plain .text if they don't fall through. Cargo cult!
o Other elf ports will need to copy the alpha and i386 example mods.
2001-05-12 02:44:14 +04:00
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#define MD_INIT_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.init)
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#define MD_FINI_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.fini)
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2002-11-22 09:44:56 +03:00
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/* We assume we need to reload our GP. */
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#define MD_CALL_STATIC_FUNCTION(section, func) \
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2005-12-25 00:51:51 +03:00
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__asm(".section " #section "\n" \
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2002-11-22 09:44:56 +03:00
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" br $29, 1f \n" \
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2002-11-22 19:47:20 +03:00
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"1: ldgp $29, 0($29) \n" \
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2002-11-22 09:44:56 +03:00
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" unop \n" \
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" jsr $26, " #func "\n" \
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" .align 3; .previous");
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