Add rules.mk for building Trusty.

(This is a no-op change for the Android build. The Android build system
doesn't care about rules.mk.)

This is cherry-picked from AOSP.  It's needed in mnc-dev so that the
t132-mnc branch of Trusty can track this version of BoringSSL rather
than the one from AOSP.  That's important so we can have reproducible
builds of the MNC version of Trusty for Volantis.

Bug: 22202624
Change-Id: I19359abd83983efa597047f88295bb4f88bb415b

rules.mk

@@ -0,0 +1,70 @@
+# Copyright (C) 2015 The Android Open Source Project.
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+# This file is not used in the Android build process! It's used only by Trusty.
+
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+LOCAL_PATH := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+TARGET_ARCH := $(ARCH)
+TARGET_2ND_ARCH := $(ARCH)
+
+# Reset local variables
+LOCAL_CFLAGS :=
+LOCAL_C_INCLUDES :=
+LOCAL_SRC_FILES_$(TARGET_ARCH) :=
+LOCAL_SRC_FILES_$(TARGET_2ND_ARCH) :=
+LOCAL_CFLAGS_$(TARGET_ARCH) :=
+LOCAL_CFLAGS_$(TARGET_2ND_ARCH) :=
+LOCAL_ADDITIONAL_DEPENDENCIES :=
+
+# get target_c_flags, target_c_includes, target_src_files
+MODULE_SRCDEPS += $(LOCAL_DIR)/crypto-sources.mk
+include $(LOCAL_DIR)/crypto-sources.mk
+
+# Some files in BoringSSL use OS functions that aren't supported by Trusty. The
+# easiest way to deal with them is not to include them. As long as no path to
+# the functions defined in these files exists, the linker will be happy. If
+# such a path is created, it'll be a link-time error and something more complex
+# may need to be considered.
+LOCAL_SRC_FILES := $(filter-out android_compat_hacks.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/bio/connect.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/bio/fd.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/bio/file.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/bio/socket.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/bio/socket_helper.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/directory_posix.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/rand/urandom.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/time_support.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/x509/by_dir.c,$(LOCAL_SRC_FILES))
+LOCAL_SRC_FILES := $(filter-out src/crypto/x509v3/v3_utl.c,$(LOCAL_SRC_FILES))
+
+# BoringSSL detects Trusty based on this define and does things like switch to
+# no-op threading functions.
+MODULE_CFLAGS += -DTRUSTY
+
+MODULE_SRCS += $(addprefix $(LOCAL_DIR)/,$(LOCAL_SRC_FILES))
+MODULE_SRCS += $(addprefix $(LOCAL_DIR)/,$(LOCAL_SRC_FILES_$(ARCH)))
+LOCAL_C_INCLUDES := src/crypto src/include
+
+GLOBAL_INCLUDES += $(addprefix $(LOCAL_DIR)/,$(LOCAL_C_INCLUDES))
+
+MODULE_DEPS := \
+	lib/openssl-stubs \
+	lib/libc-trusty
+
+include make/module.mk