Hook up LLVM compiler-rt in the build system

This patch enables compiler-rt for the AArch32 target.  The code is
not used for AArch64 as the architecture supports the 64-bit division
and modulo operations natively.

Change-Id: I1703a92872b0bb56ac0b98c67193830683963b13
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

Makefile

@@ -51,6 +51,7 @@ INC_DIRS_TO_CHECK	:=	$(sort $(filter-out			\
 					include/lib,			\
 					$(wildcard include/*)))
 LIB_DIRS_TO_CHECK	:=	$(sort $(filter-out			\
+					lib/compiler-rt			\
 					lib/libfdt%			\
 					lib/stdlib,			\
 					$(wildcard lib/*)))
@@ -144,6 +145,7 @@ LDFLAGS			+=	--gc-sections
 ################################################################################
 # Common sources and include directories
 ################################################################################
+include lib/compiler-rt/compiler-rt.mk
 include lib/stdlib/stdlib.mk
 
 BL_COMMON_SOURCES	+=	common/bl_common.c			\
@@ -153,6 +155,7 @@ BL_COMMON_SOURCES	+=	common/bl_common.c			\
 				lib/${ARCH}/misc_helpers.S		\
 				plat/common/${ARCH}/plat_common.c	\
 				plat/common/${ARCH}/platform_helpers.S	\
+				${COMPILER_RT_SRCS}			\
 				${STDLIB_SRCS}
 
 INCLUDES		+=	-Iinclude/bl1				\

lib/compiler-rt/builtins/int_lib.h

@@ -13,6 +13,11 @@
  * ===----------------------------------------------------------------------===
  */
 
+/*
+ * Portions copyright (c) 2017, ARM Limited and Contributors.
+ * All rights reserved.
+ */
+
 #ifndef INT_LIB_H
 #define INT_LIB_H
 
@@ -54,21 +59,13 @@
 #define UNUSED __attribute__((unused))
 #endif
 
-#if defined(__NetBSD__) && (defined(_KERNEL) || defined(_STANDALONE))
 /*
  * Kernel and boot environment can't use normal headers,
  * so use the equivalent system headers.
  */
-#  include <machine/limits.h>
+#  include <sys/limits.h>
 #  include <sys/stdint.h>
 #  include <sys/types.h>
-#else
-/* Include the standard compiler builtin headers we use functionality from. */
-#  include <limits.h>
-#  include <stdint.h>
-#  include <stdbool.h>
-#  include <float.h>
-#endif
 
 /* Include the commonly used internal type definitions. */
 #include "int_types.h"

lib/compiler-rt/compiler-rt.mk

+#
+# Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+#
+# 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.
+#
+# Neither the name of ARM nor the names of its contributors may be used
+# to endorse or promote products derived from this software without specific
+# prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+#
+
+ifeq (${ARCH},aarch32)
+COMPILER_RT_SRCS	:=	lib/compiler-rt/builtins/arm/aeabi_uldivmod.S	\
+				lib/compiler-rt/builtins/udivmoddi4.c
+endif