78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*-
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* Copyright 1996-1998 John D. Polstra.
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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typedef void (*fptr)(void);
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static fptr ctor_list[1] __attribute__((section(".ctors"))) = { (fptr) -1 };
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static fptr dtor_list[1] __attribute__((section(".dtors"))) = { (fptr) -1 };
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/* Both do_ctors() and do_dtors() live in .text (the default) */
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static void
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do_ctors(void)
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{
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fptr *fpp;
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for(fpp = ctor_list + 1; *fpp != 0; ++fpp)
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(**fpp)();
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}
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static void
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do_dtors(void)
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{
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fptr *fpp;
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for(fpp = dtor_list + 1; *fpp != 0; ++fpp)
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;
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while(--fpp > dtor_list)
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(**fpp)();
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}
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/*
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* On very large programs, it is possible to get a relocation overflow
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* of the 21-bit BSR displacements. It is particularly likely for the
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* calls from _init() and _fini(), because they are in separate sections.
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* Avoid the problem by forcing indirect calls.
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*/
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static void (*p_do_ctors)(void) = do_ctors;
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static void (*p_do_dtors)(void) = do_dtors;
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extern void _init(void) __attribute__((section(".init")));
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void
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_init(void)
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{
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(*p_do_ctors)();
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}
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extern void _fini(void) __attribute__((section(".fini")));
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void
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_fini(void)
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{
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(*p_do_dtors)();
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}
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