Module Name: src
Committed By: matt
Date: Tue Jan 29 19:14:54 UTC 2013
Added Files:
src/lib/libc/arch/arm/misc: arm_initfini.c
Log Message:
Add a constructor for EABI to determine if a FPU is present on the system.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/lib/libc/arch/arm/misc/arm_initfini.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/lib/libc/arch/arm/misc/arm_initfini.c
diff -u /dev/null src/lib/libc/arch/arm/misc/arm_initfini.c:1.1
--- /dev/null Tue Jan 29 19:14:54 2013
+++ src/lib/libc/arch/arm/misc/arm_initfini.c Tue Jan 29 19:14:54 2013
@@ -0,0 +1,61 @@
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+
+__RCSID("$NetBSD: arm_initfini.c,v 1.1 2013/01/29 19:14:54 matt Exp $");
+
+/*
+ * To properly implement setjmp/longjmp for the ARM AAPCS ABI, it has to be
+ * aware of whether there is a FPU is present or not. Regardless of whether
+ * the hard-float ABI is being used, setjmp needs to save D8-D15. But it can
+ * only do this if those instructions won't cause an exception.
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+#include <stdbool.h>
+
+int _libc_arm_fpu_present;
+static bool _libc_aapcs_initialized;
+
+void _libc_aapcs_init(void) __attribute__((__constructor__, __used__));
+
+void
+_libc_aapcs_init(void)
+{
+ if (_libc_aapcs_initialized)
+ return;
+
+ _libc_aapcs_initialized = true;
+ size_t len = sizeof(_libc_arm_fpu_present);
+ (void)sysctlbyname("machdep.fpu_present", &_libc_arm_fpu_present, &len,
+ NULL, 0);
+}
