1 /*-
2 * SPDX-License-Identifier: BSD-1-Clause
3 *
4 * Copyright 2018 Andrew Turner
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
13 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
14 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
15 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
18 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
19 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24 #include <sys/cdefs.h>
25 #include "crt.h"
26
27 typedef void (*crt_func)(void);
28
29 static crt_func __JCR_END__[] __section(".jcr") __used = {
30 (crt_func)0
31 };
32
33 #ifdef HAVE_CTORS
34
35 /*
36 * On some architectures and toolchains we may need to call the .ctors.
37 * These are called in the reverse order they are in the ELF file.
38 */
39 static void __do_global_ctors_aux(void) __used;
40
41 static crt_func __CTOR_END__[] __section(".ctors") __used = {
42 (crt_func)0
43 };
44 static crt_func __DTOR_END__[] __section(".dtors") __used = {
45 (crt_func)0
46 };
47
48 static void
__do_global_ctors_aux(void)49 __do_global_ctors_aux(void)
50 {
51 crt_func fn;
52 int n;
53
54 for (n = 1;; n++) {
55 fn = __CTOR_END__[-n];
56 if (fn == (crt_func)0 || fn == (crt_func)-1)
57 break;
58 fn();
59 }
60 }
61
62 asm (
63 ".pushsection .init \n"
64 "\t" INIT_CALL_SEQ(__do_global_ctors_aux) "\n"
65 ".popsection \n"
66 );
67 #endif
68