From 99ca27526b67a5654711b196246a0032f3c88b6c Mon Sep 17 00:00:00 2001
From: matt <matt@NetBSD.org>
Date: Thu, 27 Feb 2014 09:37:02 +0000
Subject: [PATCH] Add a method to test the compiler for things like LDREX
 availability, LDRD availability, THUMB2, EABI.

---
 common/lib/libc/arch/arm/features.c  | 74 ++++++++++++++++++++++++++++
 common/lib/libc/arch/arm/features.mk |  9 ++++
 2 files changed, 83 insertions(+)
 create mode 100644 common/lib/libc/arch/arm/features.c
 create mode 100644 common/lib/libc/arch/arm/features.mk

diff --git a/common/lib/libc/arch/arm/features.c b/common/lib/libc/arch/arm/features.c
new file mode 100644
index 000000000000..1271acda8741
--- /dev/null
+++ b/common/lib/libc/arch/arm/features.c
@@ -0,0 +1,74 @@
+/* $NetBSD: features.c,v 1.1 2014/02/27 09:37:02 matt Exp $ */
+/*-
+ * Copyright (c) 2014 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.
+ */
+
+/*
+ * This file is used to have the compiler check for feature and then
+ * have make set a variable based on that test.
+ *
+ * FEAT_EABI!=if ${COMPILE.c} -fsyntax-only -DEABI_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+ * FEAT_LDREX!=if ${COMPILE.c} -fsyntax-only -DLDREX_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+ * FEAT_LDRD!=if ${COMPILE.c} -fsyntax-only -DLDRD_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+ * FEAT_THUMB2!=if ${COMPILE.c} -fsyntax-only -DTHUMB2_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+ */
+
+#if defined (__ARM_ARCH_8A__)  || defined (__ARM_ARCH_7__) || \
+    defined (__ARM_ARCH_7A__)  || defined (__ARM_ARCH_7R__) || \
+    defined (__ARM_ARCH_7M__)  || defined (__ARM_ARCH_7EM__) || \
+    defined (__ARM_ARCH_6T2__)
+#define HAVE_THUMB2
+#endif
+
+#if defined (HAVE_THUMB2) || defined (__ARM_ARCH_6__) || \
+    defined (__ARM_ARCH_6J__)  || defined (__ARM_ARCH_6K__) || \
+    defined (__ARM_ARCH_6Z__)  || defined (__ARM_ARCH_6ZK__) || \
+    defined (__ARM_ARCH_6ZM__)
+#define HAVE_LDREX
+#endif
+
+#if defined (HAVE_LDREX) || defined(__ARM_ARCH_5TE__) || \
+    defined (__ARM_ARCH_5TEJ__)
+#define HAVE_LDRD
+#endif
+
+#if defined(THUMB2_TEST) && !defined(HAVE_THUMB2)
+#error no thumb2
+#endif
+
+#if defined(LDREX_TEST) && !defined(HAVE_LDREX)
+#error no ldrex
+#endif
+
+#if defined(LDRD_TEST) && !defined(HAVE_LDRD)
+#error no ldrd
+#endif
+
+#if defined(EABI_TEST) && !defined(__ARM_EABI__)
+#error not eabi
+#endif
diff --git a/common/lib/libc/arch/arm/features.mk b/common/lib/libc/arch/arm/features.mk
new file mode 100644
index 000000000000..eb583282c941
--- /dev/null
+++ b/common/lib/libc/arch/arm/features.mk
@@ -0,0 +1,9 @@
+# $NetBSD: features.mk,v 1.1 2014/02/27 09:37:02 matt Exp $
+
+.ifnmake obj
+TESTFILE=${NETBSDSRCDIR}/common/lib/libc/arch/arm/features.c
+FEAT_EABI!=if ${COMPILE.c} -fsyntax-only -DEABI_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+FEAT_LDREX!=if ${COMPILE.c} -fsyntax-only -DLDREX_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+FEAT_LDRD!=if ${COMPILE.c} -fsyntax-only -DLDRD_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+FEAT_THUMB2!=if ${COMPILE.c} -fsyntax-only -DTHUMB2_TEST ${TESTFILE} >/dev/null 2>/dev/null; then echo yes; else echo no; fi
+.endif