NetBSD/lib/csu/i386_elf/crtbegin.c

124 lines
3.7 KiB
C

/* $NetBSD: crtbegin.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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.
*/
/*
* XXX EVENTUALLY SHOULD BE MERGED BACK WITH c++rt0.c
*/
/*
* 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>
#include "sysident.h"
static void (*__CTOR_LIST__[1]) __P((void))
__attribute__((section(".ctors"))) = { (void *)-1 }; /* XXX */
static void (*__DTOR_LIST__[1]) __P((void))
__attribute__((section(".dtors"))) = { (void *)-1 }; /* XXX */
static void __dtors __P((void));
static void __ctors __P((void));
static void
__dtors()
{
unsigned long i = (unsigned long) __DTOR_LIST__[0];
void (**p)(void);
if (i == -1) {
for (i = 1; __DTOR_LIST__[i] != NULL; i++)
;
i--;
}
p = __DTOR_LIST__ + i;
while (i--)
(**p--)();
}
static void
__ctors()
{
void (**p)(void) = __CTOR_LIST__ + 1;
while (*p)
(**p++)();
}
extern void _init(void) __attribute__((section(".init")));
void
_init()
{
static int initialized = 0;
static void (*volatile call__ctors)(void) = __ctors;
/*
* Call global constructors.
* Arrange to call global destructors at exit.
*/
/* prevent function pointer constant propagation */
if (!initialized) {
initialized = 1;
(*call__ctors)();
}
}
extern void _fini(void) __attribute__((section(".fini")));
void
_fini()
{
static void (* volatile call__dtors)(void) = __dtors;
/*
* Call global destructors.
*/
/* prevent function pointer constant propagation */
(*call__dtors)();
}