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crtbegin.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Matt Thomas of 3am Software Foundry.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 #include <sys/cdefs.h>
     30 __RCSID("$NetBSD: crtbegin.c,v 1.1 2013/06/22 02:37:09 matt Exp $");
     31 
     32 typedef void (*fptr_t)(void);
     33 
     34 __dso_hidden const fptr_t __JCR_LIST__[0] __section(".jcr");
     35 __dso_hidden const long __EH_FRAME_LIST__[0] __section(".eh_frame");
     36 __dso_hidden const fptr_t __CTOR_LIST__[] __section(".ctors") = {
     37 	(fptr_t) -1,
     38 };
     39 __dso_hidden extern const fptr_t __CTOR_LIST_END__[];
     40 __dso_hidden const fptr_t __DTOR_LIST__[] __section(".dtors") = {
     41 	(fptr_t) -1,
     42 };
     43 __dso_hidden extern const fptr_t __DTOR_LIST_END__[];
     44 
     45 #ifdef SHARED
     46 __dso_hidden void *__dso_handle = &__dso_handle;
     47 #else
     48 __dso_hidden void *__dso_handle;
     49 #endif
     50 
     51 __weakref_visible void cxa_finalize(void *)
     52 	__weak_reference(__cxa_finalize);
     53 __weakref_visible void Jv_RegisterClasses(const fptr_t *)
     54 	__weak_reference(_Jv_RegisterClasses);
     55 __weakref_visible void register_frame_info(const void *, const void *)
     56 	__weak_reference(__register_frame_info);
     57 __weakref_visible void deregister_frame_info(const void *)
     58 	__weak_reference(__deregister_frame_info);
     59 
     60 static long dwarf_eh_object[6];
     61 static unsigned char __initialized;
     62 static unsigned char __finished;
     63 
     64 static void __do_global_ctors_aux(void) __used;
     65 static void __do_global_dtors_aux(void) __used;
     66 
     67 static void
     68 __do_global_ctors_aux(void)
     69 {
     70 	if (__initialized)
     71 		return;
     72 
     73 	__initialized = 1;
     74 
     75 	if (register_frame_info)
     76 		register_frame_info(__EH_FRAME_LIST__, &dwarf_eh_object);
     77 
     78 	if (Jv_RegisterClasses && __JCR_LIST__[0] != 0)
     79 		Jv_RegisterClasses(__JCR_LIST__);
     80 
     81 	for (const fptr_t *p = __CTOR_LIST_END__; p > __CTOR_LIST__ + 1; ) {
     82 		(*(*--p))();
     83 	}
     84 }
     85 
     86 static void
     87 __do_global_dtors_aux(void)
     88 {
     89 	if (__finished)
     90 		return;
     91 
     92 	__finished = 1;
     93 
     94 	if (cxa_finalize)
     95 		cxa_finalize(__dso_handle);
     96 
     97 	for (const fptr_t *p = __DTOR_LIST__ + 1; p < __DTOR_LIST_END__; ) {
     98 		(*(*p++))();
     99 	}
    100 
    101 	if (deregister_frame_info)
    102 		deregister_frame_info(__EH_FRAME_LIST__);
    103 }
    104 
    105 #include "crtbegin.h"
    106