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crtbegin.c revision 1.12 
      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 1.12 2016/06/07 12:07:35 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 __weakref_visible const fptr_t __CTOR_LIST__start
     43     __weak_reference(__CTOR_LIST__);
     44 
     45 __dso_hidden const fptr_t __aligned(sizeof(void *)) __CTOR_LIST__[] __section(".ctors") = {
     46 	(fptr_t) -1,
     47 };
     48 __dso_hidden extern const fptr_t __CTOR_LIST_END__[];
     49 #endif
     50 
     51 #ifdef SHARED
     52 __dso_hidden void *__dso_handle = &__dso_handle;
     53 
     54 __weakref_visible void cxa_finalize(void *)
     55 	__weak_reference(__cxa_finalize);
     56 #else
     57 __dso_hidden void *__dso_handle;
     58 #endif
     59 
     60 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     61 __dso_hidden
     62 #if !defined(__mips__)
     63 	const
     64 #endif
     65 	long __EH_FRAME_LIST__[0] __section(".eh_frame");
     66 
     67 __weakref_visible void register_frame_info(const void *, const void *)
     68 	__weak_reference(__register_frame_info);
     69 __weakref_visible void deregister_frame_info(const void *)
     70 	__weak_reference(__deregister_frame_info);
     71 
     72 static long dwarf_eh_object[8];
     73 #endif
     74 
     75 static void __do_global_ctors_aux(void) __used;
     76 
     77 static void __section(".text.startup")
     78 __do_global_ctors_aux(void)
     79 {
     80 	static unsigned char __initialized;
     81 
     82 	if (__initialized)
     83 		return;
     84 
     85 	__initialized = 1;
     86 
     87 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     88 	if (register_frame_info)
     89 		register_frame_info(__EH_FRAME_LIST__, &dwarf_eh_object);
     90 #endif
     91 
     92 	if (Jv_RegisterClasses && __JCR_LIST__[0] != 0)
     93 		Jv_RegisterClasses(__JCR_LIST__);
     94 
     95 #if !defined(HAVE_INITFINI_ARRAY)
     96 	for (const fptr_t *p = __CTOR_LIST_END__; p > &__CTOR_LIST__start + 1; ) {
     97 		(*(*--p))();
     98 	}
     99 #endif
    100 }
    101 
    102 #if !defined(__ARM_EABI__) || defined(SHARED) || defined(__ARM_DWARF_EH__)
    103 #if !defined(HAVE_INITFINI_ARRAY)
    104 __weakref_visible const fptr_t __DTOR_LIST__start
    105     __weak_reference(__DTOR_LIST__);
    106 
    107 __dso_hidden const fptr_t __aligned(sizeof(void *)) __DTOR_LIST__[] __section(".dtors") = {
    108 	(fptr_t) -1,
    109 };
    110 __dso_hidden extern const fptr_t __DTOR_LIST_END__[];
    111 #endif
    112 
    113 static void __do_global_dtors_aux(void) __used;
    114 
    115 static void __section(".text.exit")
    116 __do_global_dtors_aux(void)
    117 {
    118 	static unsigned char __finished;
    119 
    120 	if (__finished)
    121 		return;
    122 
    123 	__finished = 1;
    124 
    125 #ifdef SHARED
    126 	if (cxa_finalize)
    127 		(*cxa_finalize)(__dso_handle);
    128 #endif
    129 
    130 #if !defined(HAVE_INITFINI_ARRAY)
    131 	for (const fptr_t *p = &__DTOR_LIST__start + 1; p < __DTOR_LIST_END__; ) {
    132 		(*(*p++))();
    133 	}
    134 #endif
    135 
    136 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
    137 	if (deregister_frame_info)
    138 		deregister_frame_info(__EH_FRAME_LIST__);
    139 #endif
    140 }
    141 #endif /* !__ARM_EABI__ || SHARED || __ARM_DWARF_EH__ */
    142