2 * Copyright (c) 1993 Paul Kranenburg
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Paul Kranenburg.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * $FreeBSD: src/lib/csu/i386/c++rt0.c,v 1.9 1999/08/27 23:57:55 peter Exp $
34 * Run-time module for GNU C++ compiled shared libraries.
36 * The linker constructs the following arrays of pointers to global
37 * constructors and destructors. The first element contains the
38 * number of pointers in each.
39 * The tables are also null-terminated.
41 extern void (*__CTOR_LIST__[])(void);
42 extern void (*__DTOR_LIST__[])(void);
47 unsigned long i = (unsigned long) __DTOR_LIST__[0];
48 void (**p)(void) = __DTOR_LIST__ + i;
57 void (**p)(void) = __CTOR_LIST__ + 1;
63 extern void __init() asm(".init");
64 extern void __fini() asm(".fini");
69 static int initialized = 0;
72 * Call global constructors.
73 * Arrange to call global destructors at exit.
89 * Make sure there is at least one constructor and one destructor in the
90 * shared library. Otherwise, the linker does not realize that the
91 * constructor and destructor lists are linker sets. It treats them as
92 * commons and resolves them to the lists from the main program. That
93 * causes multiple invocations of the main program's static constructors
94 * and destructors, which is very bad.
102 /* Linker magic to add an element to a constructor or destructor list. */
103 #define TEXT_SET(set, sym) \
104 asm(".stabs \"_" #set "\", 23, 0, 0, _" #sym)
106 TEXT_SET(__CTOR_LIST__, do_nothing);
107 TEXT_SET(__DTOR_LIST__, do_nothing);