2 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Matt Thomas of 3am Software Foundry.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
30 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: arm_initfini.c,v 1.7 2013/09/08 13:15:53 matt Exp $");
34 #include "namespace.h"
37 * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be
38 * aware of whether there is a FPU is present or not. Regardless of whether
39 * the hard-float ABI is being used, setjmp needs to save D8-D15. But it can
40 * only do this if those instructions won't cause an exception.
43 #include <sys/param.h>
44 #include <sys/sysctl.h>
49 __dso_hidden
int _libc_arm_fpu_present
;
50 #ifndef __ARM_ARCH_EXT_IDIV__
51 __dso_hidden
int _libc_arm_hwdiv_present
;
53 static bool _libc_aapcs_initialized
;
55 void _libc_aapcs_init(void) __attribute__((__constructor__
, __used__
));
57 void __section(".text.startup")
58 _libc_aapcs_init(void)
60 if (!_libc_aapcs_initialized
) {
62 size_t len
= sizeof(_libc_arm_fpu_present
);
64 _libc_aapcs_initialized
= true;
66 (void)sysctlbyname("machdep.fpu_present",
67 &_libc_arm_fpu_present
, &len
, NULL
, 0);
68 #ifndef __ARM_ARCH_EXT_IDIV__
69 (void)sysctlbyname("machdep.hwdiv_present",
70 &_libc_arm_hwdiv_present
, &len
, NULL
, 0);
72 #endif /* !defined(__minix) */