#   honggfuzz - Android makefile
#   -----------------------------------------
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

LOCAL_PATH := $(abspath $(call my-dir)/..)

# Force a clean if target API has changed and a previous build exists
ifneq ("$(wildcard $(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/android_api.txt)","")
  CACHED_API := $(shell cat "$(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/android_api.txt")
  ifneq ($(ANDROID_API),$(CACHED_API))
    $(info [!] Previous build was targeting different API level - cleaning)
    DUMMY_CLEAN := $(shell make clean)
  endif
endif

# Force a clean if selected toolchain has changed and a previous build exists
ifneq ("$(wildcard $(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/ndk_toolchain.txt)","")
  CACHED_TOOLCHAIN := $(shell cat "$(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/ndk_toolchain.txt")
  ifneq ($(NDK_TOOLCHAIN),$(CACHED_TOOLCHAIN))
    $(info [!] Previous build was using different toolchain - cleaning)
    DUMMY_CLEAN := $(shell make clean)
  endif
endif

# Enable Linux ptrace() instead of POSIX signal interface by default
ANDROID_WITH_PTRACE ?= true

ifeq ($(ANDROID_WITH_PTRACE),true)
  ifeq ($(APP_ABI),$(filter $(APP_ABI),armeabi armeabi-v7a))
    ARCH_ABI := arm
  else ifeq ($(APP_ABI),$(filter $(APP_ABI),x86))
    ARCH_ABI := x86
  else ifeq ($(APP_ABI),$(filter $(APP_ABI),arm64-v8a))
    ARCH_ABI := arm64
  else ifeq ($(APP_ABI),$(filter $(APP_ABI),x86_64))
    ARCH_ABI := x86_64
  else
    $(error Unsuported / Unknown APP_API '$(APP_ABI)')
  endif

  # Additional libcrypto OpenSSL flags required to mitigate bug (ARM systems with API <= 21)
  ifeq ($(APP_ABI),$(filter $(APP_ABI),armeabi))
    OPENSSL_ARMCAP_ABI := "5"
  else ifeq ($(APP_ABI),$(filter $(APP_ABI),armeabi-v7a))
    OPENSSL_ARMCAP_ABI := "7"
  endif

  # Upstream libunwind compiled from sources with Android NDK toolchain
  LIBUNWIND_A := third_party/android/libunwind/$(ARCH_ABI)/libunwind-$(ARCH_ABI).a
  ifeq ("$(wildcard $(LIBUNWIND_A))","")
    $(error libunwind-$(ARCH_ABI) is missing - to build execute \
            'third_party/android/scripts/compile-libunwind.sh third_party/android/libunwind $(ARCH_ABI)')
  endif

  include $(CLEAR_VARS)
  LOCAL_MODULE := libunwind
  LOCAL_SRC_FILES := third_party/android/libunwind/$(ARCH_ABI)/libunwind.a
  LOCAL_EXPORT_C_INCLUDES := third_party/android/libunwind/include
  include $(PREBUILT_STATIC_LIBRARY)

  include $(CLEAR_VARS)
  LOCAL_MODULE := libunwind-arch
  LOCAL_SRC_FILES := third_party/android/libunwind/$(ARCH_ABI)/libunwind-$(ARCH_ABI).a
  LOCAL_EXPORT_C_INCLUDES := third_party/android/libunwind/include
  include $(PREBUILT_STATIC_LIBRARY)

  include $(CLEAR_VARS)
  LOCAL_MODULE := libunwind-ptrace
  LOCAL_SRC_FILES := third_party/android/libunwind/$(ARCH_ABI)/libunwind-ptrace.a
  LOCAL_EXPORT_C_INCLUDES := third_party/android/libunwind/include
  include $(PREBUILT_STATIC_LIBRARY)

  LOCAL_MODULE := libunwind-dwarf-generic
  LOCAL_SRC_FILES := third_party/android/libunwind/$(ARCH_ABI)/libunwind-dwarf-generic.a
  LOCAL_EXPORT_C_INCLUDES := third_party/android/libunwind/include
  include $(PREBUILT_STATIC_LIBRARY)

  # Upstream capstone compiled from sources with Android NDK toolchain
  LIBCAPSTONE_A := third_party/android/capstone/$(ARCH_ABI)/libcapstone.a
  ifeq ("$(wildcard $(LIBCAPSTONE_A))","")
    $(error libcapstone is missing - to build execute \
            'third_party/android/scripts/compile-capstone.sh third_party/android/capstone $(ARCH_ABI)')
  endif
  include $(CLEAR_VARS)
  LOCAL_MODULE := libcapstone
  LOCAL_SRC_FILES := $(LIBCAPSTONE_A)
  LOCAL_EXPORT_C_INCLUDES := third_party/android/capstone/include
  include $(PREBUILT_STATIC_LIBRARY)
endif

ifneq (,$(findstring clang,$(NDK_TOOLCHAIN)))
  LIBBRT_A := third_party/android/libBlocksRuntime/$(ARCH_ABI)/libblocksruntime.a
  ifeq ("$(wildcard $(LIBBRT_A))","")
    $(error libBlocksRuntime is missing - to build execute \
            'third_party/android/scripts/compile-libBlocksRuntime.sh third_party/android/libBlocksRuntime $(ARCH_ABI)')
  endif
  include $(CLEAR_VARS)
  LOCAL_MODULE := libblocksruntime
  LOCAL_SRC_FILES := $(LIBBRT_A)
  include $(PREBUILT_STATIC_LIBRARY)
endif

ifeq ($(ANDROID_WITH_PTRACE),true)
  ARCH_SRCS := linux/arch.c linux/ptrace_utils.c linux/perf.c linux/unwind.c linux/pt.c
  ARCH := LINUX
  $(info $(shell (echo "********************************************************************")))
  $(info $(shell (echo "Android PTRACE build: Will prevent debuggerd from processing crashes")))
  $(info $(shell (echo "********************************************************************")))
else
  ARCH_SRCS := posix/arch.c
  ARCH := POSIX
  $(info $(shell (echo "********************************************************************")))
  $(info $(shell (echo "Android POSIX build: Will allow debuggerd to also process crashes")))
  $(info $(shell (echo "********************************************************************")))
endif

COMMON_CFLAGS := -std=c11 -I. \
  -D_GNU_SOURCE \
  -Wall -Wextra -Wno-initializer-overrides -Wno-override-init \
  -Wno-unknown-warning-option -Werror -funroll-loops -O2 \
  -Wframe-larger-than=51200

# libhfuzz module
include $(CLEAR_VARS)
LOCAL_MODULE := hfuzz
LOCAL_SRC_FILES := $(wildcard libhfuzz/*.c)
LOCAL_CFLAGS := -D_HF_ARCH_${ARCH} $(COMMON_CFLAGS) \
	-fPIC -fno-builtin -fno-stack-protector

ifneq (,$(findstring clang,$(NDK_TOOLCHAIN)))
  LOCAL_CFLAGS += -fblocks
  LOCAL_STATIC_LIBRARIES += libblocksruntime
endif

include $(BUILD_STATIC_LIBRARY)

# Main honggfuzz module
include $(CLEAR_VARS)

LOCAL_MODULE := honggfuzz
LOCAL_SRC_FILES := $(wildcard *.c)
LOCAL_CFLAGS := $(COMMON_CFLAGS)
LOCAL_LDFLAGS := -lm -latomic
LOCAL_STATIC_LIBRARIES := libhfuzz

ifeq ($(ANDROID_WITH_PTRACE),true)
  LOCAL_C_INCLUDES := third_party/android/libunwind/include \
                      third_party/android/capstone/include
  LOCAL_STATIC_LIBRARIES += libunwind-arch \
                            libunwind \
                            libunwind-ptrace \
                            libunwind-dwarf-generic \
                            libcapstone
  LOCAL_CFLAGS += -D__HF_USE_CAPSTONE__
  ifeq ($(ARCH_ABI),arm)
    LOCAL_CFLAGS += -DOPENSSL_ARMCAP_ABI='$(OPENSSL_ARMCAP_ABI)'
  endif
endif

LOCAL_SRC_FILES += $(ARCH_SRCS)
LOCAL_CFLAGS += -D_HF_ARCH_${ARCH}

ifneq (,$(findstring clang,$(NDK_TOOLCHAIN)))
  LOCAL_CFLAGS += -fblocks
  LOCAL_STATIC_LIBRARIES += libblocksruntime
endif

include $(BUILD_EXECUTABLE)

# The NDK build system does not copy static libraries into project/packages
# so it has to be done manually in order to have all output under a single path.
# Also save some build attribute cache files so that cleans can be enforced when
# required.
all:POST_BUILD_EVENT
POST_BUILD_EVENT:
	@echo $(ANDROID_API) > $(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/android_api.txt
	@echo $(NDK_TOOLCHAIN) > $(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/ndk_toolchain.txt
	@test -f $(LOCAL_PATH)/obj/local/$(TARGET_ARCH_ABI)/libhfuzz.a && \
	  cp $(LOCAL_PATH)/obj/local/$(TARGET_ARCH_ABI)/libhfuzz.a \
	    $(LOCAL_PATH)/libs/$(TARGET_ARCH_ABI)/libhfuzz.a || true