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crtbegin.c revision 1.9 
      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 1.9 2014/05/06 16:02:10 joerg Exp $");
     31 
     32 #include "crtbegin.h"
     33 
     34 typedef void (*fptr_t)(void);
     35 
     36 __dso_hidden const fptr_t __JCR_LIST__[0] __section(".jcr");
     37 
     38 __weakref_visible void Jv_RegisterClasses(const fptr_t *)
     39 	__weak_reference(_Jv_RegisterClasses);
     40 
     41 #if !defined(HAVE_INITFINI_ARRAY)
     42 __dso_hidden const fptr_t __aligned(sizeof(void *)) __CTOR_LIST__[] __section(".ctors") = {
     43 	(fptr_t) -1,
     44 };
     45 __dso_hidden extern const fptr_t __CTOR_LIST_END__[];
     46 #endif
     47 
     48 #ifdef SHARED
     49 __dso_hidden void *__dso_handle = &__dso_handle;
     50 
     51 __weakref_visible void cxa_finalize(void *)
     52 	__weak_reference(__cxa_finalize);
     53 #else
     54 __dso_hidden void *__dso_handle;
     55 #endif
     56 
     57 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     58 __dso_hidden
     59 #if !defined(__mips__)
     60 	const
     61 #endif
     62 	long __EH_FRAME_LIST__[0] __section(".eh_frame");
     63 
     64 __weakref_visible void register_frame_info(const void *, const void *)
     65 	__weak_reference(__register_frame_info);
     66 __weakref_visible void deregister_frame_info(const void *)
     67 	__weak_reference(__deregister_frame_info);
     68 
     69 static long dwarf_eh_object[8];
     70 #endif
     71 
     72 static void __do_global_ctors_aux(void) __used;
     73 
     74 static void __section(".text.startup")
     75 __do_global_ctors_aux(void)
     76 {
     77 	static unsigned char __initialized;
     78 
     79 	if (__initialized)
     80 		return;
     81 
     82 	__initialized = 1;
     83 
     84 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     85 	if (register_frame_info)
     86 		register_frame_info(__EH_FRAME_LIST__, &dwarf_eh_object);
     87 #endif
     88 
     89 	if (Jv_RegisterClasses && __JCR_LIST__[0] != 0)
     90 		Jv_RegisterClasses(__JCR_LIST__);
     91 
     92 #if !defined(HAVE_INITFINI_ARRAY)
     93 	for (const fptr_t *p = __CTOR_LIST_END__; p > __CTOR_LIST__ + 1; ) {
     94 		(*(*--p))();
     95 	}
     96 #endif
     97 }
     98 
     99 #if !defined(__ARM_EABI__) || defined(SHARED) || defined(__ARM_DWARF_EH__)
    100 #if !defined(HAVE_INITFINI_ARRAY)
    101 __dso_hidden const fptr_t __aligned(sizeof(void *)) __DTOR_LIST__[] __section(".dtors") = {
    102 	(fptr_t) -1,
    103 };
    104 __dso_hidden extern const fptr_t __DTOR_LIST_END__[];
    105 #endif
    106 
    107 static void __do_global_dtors_aux(void) __used;
    108 
    109 static void __section(".text.exit")
    110 __do_global_dtors_aux(void)
    111 {
    112 	static unsigned char __finished;
    113 
    114 	if (__finished)
    115 		return;
    116 
    117 	__finished = 1;
    118 
    119 #ifdef SHARED
    120 	if (cxa_finalize)
    121 		(*cxa_finalize)(__dso_handle);
    122 #endif
    123 
    124 #if !defined(HAVE_INITFINI_ARRAY)
    125 	for (const fptr_t *p = __DTOR_LIST__ + 1; p < __DTOR_LIST_END__; ) {
    126 		(*(*p++))();
    127 	}
    128 #endif
    129 
    130 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
    131 	if (deregister_frame_info)
    132 		deregister_frame_info(__EH_FRAME_LIST__);
    133 #endif
    134 }
    135 #endif /* !__ARM_EABI__ || SHARED || __ARM_DWARF_EH__ */
    136