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crtbegin.c revision 1.10 
      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 1.10 2016/06/01 21:21:55 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 __weakref_visible const fptr_t __CTOR_LIST__end[]
     45     __weak_reference(__CTOR_LIST_END__);
     46 
     47 __dso_hidden const fptr_t __aligned(sizeof(void *)) __CTOR_LIST__[] __section(".ctors") = {
     48 	(fptr_t) -1,
     49 };
     50 __dso_hidden extern const fptr_t __CTOR_LIST_END__[];
     51 #endif
     52 
     53 #ifdef SHARED
     54 __dso_hidden void *__dso_handle = &__dso_handle;
     55 
     56 __weakref_visible void cxa_finalize(void *)
     57 	__weak_reference(__cxa_finalize);
     58 #else
     59 __dso_hidden void *__dso_handle;
     60 #endif
     61 
     62 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     63 __dso_hidden
     64 #if !defined(__mips__)
     65 	const
     66 #endif
     67 	long __EH_FRAME_LIST__[0] __section(".eh_frame");
     68 
     69 __weakref_visible void register_frame_info(const void *, const void *)
     70 	__weak_reference(__register_frame_info);
     71 __weakref_visible void deregister_frame_info(const void *)
     72 	__weak_reference(__deregister_frame_info);
     73 
     74 static long dwarf_eh_object[8];
     75 #endif
     76 
     77 static void __do_global_ctors_aux(void) __used;
     78 
     79 static void __section(".text.startup")
     80 __do_global_ctors_aux(void)
     81 {
     82 	static unsigned char __initialized;
     83 
     84 	if (__initialized)
     85 		return;
     86 
     87 	__initialized = 1;
     88 
     89 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     90 	if (register_frame_info)
     91 		register_frame_info(__EH_FRAME_LIST__, &dwarf_eh_object);
     92 #endif
     93 
     94 	if (Jv_RegisterClasses && __JCR_LIST__[0] != 0)
     95 		Jv_RegisterClasses(__JCR_LIST__);
     96 
     97 #if !defined(HAVE_INITFINI_ARRAY)
     98 	for (const fptr_t *p = __CTOR_LIST__end; p > __CTOR_LIST__start + 1; ) {
     99 		(*(*--p))();
    100 	}
    101 #endif
    102 }
    103 
    104 #if !defined(__ARM_EABI__) || defined(SHARED) || defined(__ARM_DWARF_EH__)
    105 #if !defined(HAVE_INITFINI_ARRAY)
    106 __weakref_visible const fptr_t __DTOR_LIST__start[]
    107     __weak_reference(__DTOR_LIST__);
    108 __weakref_visible const fptr_t __DTOR_LIST__end[]
    109     __weak_reference(__DTOR_LIST_END__);
    110 
    111 __dso_hidden const fptr_t __aligned(sizeof(void *)) __DTOR_LIST__[] __section(".dtors") = {
    112 	(fptr_t) -1,
    113 };
    114 __dso_hidden extern const fptr_t __DTOR_LIST_END__[];
    115 #endif
    116 
    117 static void __do_global_dtors_aux(void) __used;
    118 
    119 static void __section(".text.exit")
    120 __do_global_dtors_aux(void)
    121 {
    122 	static unsigned char __finished;
    123 
    124 	if (__finished)
    125 		return;
    126 
    127 	__finished = 1;
    128 
    129 #ifdef SHARED
    130 	if (cxa_finalize)
    131 		(*cxa_finalize)(__dso_handle);
    132 #endif
    133 
    134 #if !defined(HAVE_INITFINI_ARRAY)
    135 	for (const fptr_t *p = __DTOR_LIST__start + 1; p < __DTOR_LIST__end; ) {
    136 		(*(*p++))();
    137 	}
    138 #endif
    139 
    140 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
    141 	if (deregister_frame_info)
    142 		deregister_frame_info(__EH_FRAME_LIST__);
    143 #endif
    144 }
    145 #endif /* !__ARM_EABI__ || SHARED || __ARM_DWARF_EH__ */
    146