Home | History | Annotate | Line # | Download | only in common
crtbegin.c revision 1.15 
      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 1.15 2018/12/27 19:32:32 christos 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 extern __dso_hidden const fptr_t __CTOR_LIST__start __asm("__CTOR_LIST__");
     42 
     43 __dso_hidden const fptr_t __aligned(sizeof(void *)) __CTOR_LIST__[] __section(".ctors") = {
     44 	(fptr_t) -1,
     45 };
     46 __dso_hidden extern const fptr_t __CTOR_LIST_END__[];
     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 const long __EH_FRAME_LIST__[0] __section(".eh_frame");
     59 
     60 __weakref_visible void register_frame_info(const void *, const void *)
     61 	__weak_reference(__register_frame_info);
     62 __weakref_visible void deregister_frame_info(const void *)
     63 	__weak_reference(__deregister_frame_info);
     64 
     65 static long dwarf_eh_object[8];
     66 #endif
     67 
     68 static void __do_global_ctors_aux(void) __used;
     69 
     70 static void __section(".text.startup")
     71 __do_global_ctors_aux(void)
     72 {
     73 	static unsigned char __initialized;
     74 
     75 	if (__initialized)
     76 		return;
     77 
     78 	__initialized = 1;
     79 
     80 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
     81 	if (register_frame_info)
     82 		register_frame_info(__EH_FRAME_LIST__, &dwarf_eh_object);
     83 #endif
     84 
     85 	if (Jv_RegisterClasses && __JCR_LIST__[0] != 0)
     86 		Jv_RegisterClasses(__JCR_LIST__);
     87 
     88 #if !defined(HAVE_INITFINI_ARRAY)
     89 	for (const fptr_t *p = __CTOR_LIST_END__; p > &__CTOR_LIST__start + 1; ) {
     90 		(*(*--p))();
     91 	}
     92 #endif
     93 }
     94 
     95 #if !defined(__ARM_EABI__) || defined(SHARED) || defined(__ARM_DWARF_EH__)
     96 #if !defined(HAVE_INITFINI_ARRAY)
     97 extern __dso_hidden const fptr_t __DTOR_LIST__start __asm("__DTOR_LIST__");
     98 
     99 __dso_hidden const fptr_t __aligned(sizeof(void *)) __DTOR_LIST__[] __section(".dtors") = {
    100 	(fptr_t) -1,
    101 };
    102 __dso_hidden extern const fptr_t __DTOR_LIST_END__[];
    103 #endif
    104 
    105 static void __do_global_dtors_aux(void) __used;
    106 
    107 static void __section(".text.exit")
    108 __do_global_dtors_aux(void)
    109 {
    110 	static unsigned char __finished;
    111 
    112 	if (__finished)
    113 		return;
    114 
    115 	__finished = 1;
    116 
    117 #ifdef SHARED
    118 	if (cxa_finalize)
    119 		(*cxa_finalize)(__dso_handle);
    120 #endif
    121 
    122 #if !defined(HAVE_INITFINI_ARRAY)
    123 	for (const fptr_t *p = &__DTOR_LIST__start + 1; p < __DTOR_LIST_END__; ) {
    124 		(*(*p++))();
    125 	}
    126 #endif
    127 
    128 #if !defined(__ARM_EABI__) || defined(__ARM_DWARF_EH__)
    129 	if (deregister_frame_info)
    130 		deregister_frame_info(__EH_FRAME_LIST__);
    131 #endif
    132 }
    133 #endif /* !__ARM_EABI__ || SHARED || __ARM_DWARF_EH__ */
    134