NetBSD/lib/csu/common_elf/crtbegin.c

202 lines
5.5 KiB
C

/* $NetBSD: crtbegin.c,v 1.18 2002/04/08 22:17:37 skrll Exp $ */
/*-
* Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg, Ross Harvey, and Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Run-time module which handles constructors and destructors,
* and NetBSD identification.
*
* The linker constructs the following arrays of pointers to global
* constructors and destructors. The first element contains the
* number of pointers in each or -1 to indicate that the run-time
* code should figure out how many there are. The tables are also
* null-terminated.
*/
#include <sys/param.h> /* sysident.h requires `NetBSD' constant */
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <stdlib.h>
#ifdef DWARF2_EH
#include "dwarf2_eh.h"
#endif
#include "sysident.h"
#include "dot_init.h"
static void (*__CTOR_LIST__[1])(void)
__attribute__((section(".ctors"))) = { (void *)-1 }; /* XXX */
static void (*__DTOR_LIST__[1])(void)
__attribute__((section(".dtors"))) = { (void *)-1 }; /* XXX */
#ifdef DWARF2_EH
static char __EH_FRAME_BEGIN__[]
__attribute__((section(".eh_frame"), aligned(4))) = { };
#endif
#if defined(JCR) && defined(__GNUC__)
extern void _Jv_RegisterClasses(void *) __attribute__((weak));
static void *__JCR_LIST__[]
__attribute__((section(".jcr"))) = { };
#endif
#if defined(DSO_HANDLE) && defined(__GNUC__)
/*
* The __dso_handle variable is used to hang C++ local destructors off
* of. In the main program (i.e. using crtbegin.o), the value is 0.
* In shared objects (i.e. using crtbeginS.o), the value must be unique.
* The symbol is hidden, but the dynamic linker will still relocate it.
*/
#ifdef SHARED
void *__dso_handle = &__dso_handle;
#else
void *__dso_handle = NULL;
#endif
__asm(".hidden __dso_handle");
#ifdef SHARED
extern void __cxa_finalize(void *) __attribute__((weak));
#endif
#endif
static void __dtors(void);
static void __ctors(void);
INIT_FALLTHRU_DECL;
FINI_FALLTHRU_DECL;
extern void _init(void) __attribute__((section(".init")));
extern void _fini(void) __attribute__((section(".fini")));
static void __ctors(void) __attribute__((section(".init")));
static void __dtors(void) __attribute__((section(".fini")));
static void
__ctors()
{
unsigned long i = (unsigned long) __CTOR_LIST__[0];
void (**p)(void);
if (i == -1) {
for (i = 1; __CTOR_LIST__[i] != NULL; i++)
;
i--;
}
p = __CTOR_LIST__ + i;
while (i--)
(**p--)();
}
static void
__dtors()
{
void (**p)(void) = __DTOR_LIST__ + 1;
while (*p)
(**p++)();
}
void
_init()
{
static int initialized = 0;
#ifdef DWARF2_EH
#if defined(__GNUC__)
static struct dwarf2_eh_object object;
#endif /* __GNUC__ */
#endif /* DWARF2_EH */
/*
* Execute code in the .init sections
*/
INIT_FALLTHRU();
if (!initialized) {
initialized = 1;
#ifdef DWARF2_EH
#if defined(__GNUC__)
if (__register_frame_info != NULL)
__register_frame_info(__EH_FRAME_BEGIN__, &object);
#endif /* __GNUC__ */
#endif /* DWARF2_EH */
#if defined(JCR) && defined(__GNUC__)
if (__JCR_LIST__[0] != NULL && _Jv_RegisterClasses != NULL)
_Jv_RegisterClasses(__JCR_LIST__);
#endif /* JCR && __GNUC__ */
/*
* Call global constructors.
*/
__ctors();
}
}
void
_fini()
{
#if defined(DSO_HANDLE) && defined(__GNUC__) && defined(SHARED)
/*
* Call local destructors.
*/
if (__cxa_finalize != NULL)
__cxa_finalize(__dso_handle);
#endif /* DSO_HANDLE && __GNUC__ && SHARED */
/*
* Call global destructors.
*/
__dtors();
#ifdef DWARF2_EH
#if defined(__GNUC__)
if (__deregister_frame_info != NULL)
__deregister_frame_info(__EH_FRAME_BEGIN__);
#endif /* __GNUC__ */
#endif /* DWARF2_EH */
/*
* Execute code in the .fini sections
*/
FINI_FALLTHRU();
}
MD_INIT_SECTION_PROLOGUE;
MD_FINI_SECTION_PROLOGUE;