######## SGX SDK Settings ########

SGX_SDK ?= /opt/intel/sgxsdk
SGX_MODE ?= HW
SGX_ARCH ?= x64
SGX_DEBUG ?= 1

ifeq ($(shell getconf LONG_BIT), 32)
	SGX_ARCH := x86
else ifeq ($(findstring -m32, $(CXXFLAGS)), -m32)
	SGX_ARCH := x86
endif

ifeq ($(SGX_ARCH), x86)
	SGX_COMMON_CFLAGS := -m32
	SGX_LIBRARY_PATH := $(SGX_SDK)/lib
	SGX_ENCLAVE_SIGNER := $(SGX_SDK)/bin/x86/sgx_sign
	SGX_EDGER8R := $(SGX_SDK)/bin/x86/sgx_edger8r
else
	SGX_COMMON_CFLAGS := -m64
	SGX_LIBRARY_PATH := $(SGX_SDK)/lib64
	SGX_ENCLAVE_SIGNER := $(SGX_SDK)/bin/x64/sgx_sign
	SGX_EDGER8R := $(SGX_SDK)/bin/x64/sgx_edger8r
endif

ifeq ($(SGX_DEBUG), 1)
ifeq ($(SGX_PRERELEASE), 1)
$(error Cannot set SGX_DEBUG and SGX_PRERELEASE at the same time!!)
endif
endif

ifeq ($(SGX_DEBUG), 1)
        SGX_COMMON_CFLAGS += -O0 -g
else
        SGX_COMMON_CFLAGS += -O2
endif

######## MesaPy for SGX Settings ########

PY ?= pypy

LIBSGX_TLIBC_PATH ?= ../../sgx_tlibc_ext
LIBSGX_TLIBC_EXT_A ?= ../../sgx_tlibc_ext/libsgx_tlibc_ext.a
LIBSGX_ULIBC_A ?= ../../sgx_ulibc/libsgx_ulibc.a

MESAPY_SGX ?= $(shell pwd)/../../
MESAPY ?= $(shell pwd)/../../../

######## EDL Settings ########

Enclave_EDL_Files := Enclave/Enclave_t.c Enclave/Enclave_t.h App/Enclave_u.c App/Enclave_u.h

######## App Settings ########

ifneq ($(SGX_MODE), HW)
	Urts_Library_Name := sgx_urts_sim
else
	Urts_Library_Name := sgx_urts
endif

App_Cpp_Files := App/App.cpp $(wildcard App/Edger8rSyntax/*.cpp) $(wildcard App/TrustedLibrary/*.cpp)
App_Include_Paths := -IInclude -IApp -I$(SGX_SDK)/include

App_C_Flags := $(SGX_COMMON_CFLAGS) -fPIC -Wno-attributes $(App_Include_Paths)

# Three configuration modes - Debug, prerelease, release
#   Debug - Macro DEBUG enabled.
#   Prerelease - Macro NDEBUG and EDEBUG enabled.
#   Release - Macro NDEBUG enabled.
ifeq ($(SGX_DEBUG), 1)
        App_C_Flags += -DDEBUG -UNDEBUG -UEDEBUG
else ifeq ($(SGX_PRERELEASE), 1)
        App_C_Flags += -DNDEBUG -DEDEBUG -UDEBUG
else
        App_C_Flags += -DNDEBUG -UEDEBUG -UDEBUG
endif

App_Cpp_Flags := $(App_C_Flags) -std=c++11
App_Link_Flags := $(SGX_COMMON_CFLAGS) -L$(SGX_LIBRARY_PATH) -l$(Urts_Library_Name) -lpthread

ifneq ($(SGX_MODE), HW)
	App_Link_Flags += -lsgx_uae_service_sim
else
	App_Link_Flags += -lsgx_uae_service
endif

App_Link_Flags += -L../../sgx_ulibc -lsgx_ulibc

App_Cpp_Objects := $(App_Cpp_Files:.cpp=.o)

App_Name := app

######## Enclave Settings ########

ifneq ($(SGX_MODE), HW)
	Trts_Library_Name := sgx_trts_sim
	Service_Library_Name := sgx_tservice_sim
else
	Trts_Library_Name := sgx_trts
	Service_Library_Name := sgx_tservice
endif
Crypto_Library_Name := sgx_tcrypto

Enclave_Cpp_Files := Enclave/Enclave.cpp $(wildcard Enclave/Edger8rSyntax/*.cpp) $(wildcard Enclave/TrustedLibrary/*.cpp)
Enclave_Include_Paths := -IInclude -IEnclave -I$(SGX_SDK)/include -I$(SGX_SDK)/include/tlibc -I$(SGX_SDK)/include/libcxx

CC_BELOW_4_9 := $(shell expr "`$(CC) -dumpversion`" \< "4.9")
ifeq ($(CC_BELOW_4_9), 1)
	Enclave_C_Flags := $(SGX_COMMON_CFLAGS) -nostdinc -fvisibility=hidden -fpie -ffunction-sections -fdata-sections -fstack-protector
else
	Enclave_C_Flags := $(SGX_COMMON_CFLAGS) -nostdinc -fvisibility=hidden -fpie -ffunction-sections -fdata-sections -fstack-protector-strong
endif

Enclave_C_Flags += $(Enclave_Include_Paths)
Enclave_Cpp_Flags := $(Enclave_C_Flags) -std=c++11 -nostdinc++

# To generate a proper enclave, it is recommended to follow below guideline to link the trusted libraries:
#    1. Link sgx_trts with the `--whole-archive' and `--no-whole-archive' options,
#       so that the whole content of trts is included in the enclave.
#    2. For other libraries, you just need to pull the required symbols.
#       Use `--start-group' and `--end-group' to link these libraries.
# Do NOT move the libraries linked with `--start-group' and `--end-group' within `--whole-archive' and `--no-whole-archive' options.
# Otherwise, you may get some undesirable errors.
Enclave_Link_Flags := $(SGX_COMMON_CFLAGS) -Wl,--no-undefined -nostdlib -nodefaultlibs -nostartfiles -L$(SGX_LIBRARY_PATH) \
	-Wl,--whole-archive -l$(Trts_Library_Name) -Wl,--no-whole-archive \
	-Wl,--start-group -lsgx_tstdc -lsgx_tcxx -l$(Crypto_Library_Name) -l$(Service_Library_Name) -Wl,--end-group \
	-Wl,-Bstatic -Wl,-Bsymbolic -Wl,--no-undefined \
	-Wl,-pie,-eenclave_entry -Wl,--export-dynamic  \
	-Wl,--defsym,__ImageBase=0 -Wl,--gc-sections   \
	-Wl,--version-script=Enclave/Enclave.lds       \
	-L$(LIBSGX_TLIBC_PATH) -lsgx_tlibc_ext

Enclave_Cpp_Objects := $(Enclave_Cpp_Files:.cpp=.o)

Enclave_Name := enclave.so
Signed_Enclave_Name := enclave.signed.so
Enclave_Config_File := Enclave/Enclave.config.xml

ifeq ($(SGX_MODE), HW)
ifeq ($(SGX_DEBUG), 1)
	Build_Mode = HW_DEBUG
else ifeq ($(SGX_PRERELEASE), 1)
	Build_Mode = HW_PRERELEASE
else
	Build_Mode = HW_RELEASE
endif
else
ifeq ($(SGX_DEBUG), 1)
	Build_Mode = SIM_DEBUG
else ifeq ($(SGX_PRERELEASE), 1)
	Build_Mode = SIM_PRERELEASE
else
	Build_Mode = SIM_RELEASE
endif
endif


.PHONY: all run

ifeq ($(Build_Mode), HW_RELEASE)
all: $(Enclave_EDL_Files) .config_$(Build_Mode)_$(SGX_ARCH) $(App_Name) $(Enclave_Name)
	@echo "The project has been built in release hardware mode."
	@echo "Please sign the $(Enclave_Name) first with your signing key before you run the $(App_Name) to launch and access the enclave."
	@echo "To sign the enclave use the command:"
	@echo "   $(SGX_ENCLAVE_SIGNER) sign -key <your key> -enclave $(Enclave_Name) -out <$(Signed_Enclave_Name)> -config $(Enclave_Config_File)"
	@echo "You can also sign the enclave using an external signing tool."
	@echo "To build the project in simulation mode set SGX_MODE=SIM. To build the project in prerelease mode set SGX_PRERELEASE=1 and SGX_MODE=HW."
else
all: .config_$(Build_Mode)_$(SGX_ARCH) $(App_Name) $(Signed_Enclave_Name)
ifeq ($(Build_Mode), HW_DEBUG)
	@echo "The project has been built in debug hardware mode."
else ifeq ($(Build_Mode), SIM_DEBUG)
	@echo "The project has been built in debug simulation mode."
else ifeq ($(Build_Mode), HW_PRERELEASE)
	@echo "The project has been built in pre-release hardware mode."
else ifeq ($(Build_Mode), SIM_PRERELEASE)
	@echo "The project has been built in pre-release simulation mode."
else
	@echo "The project has been built in release simulation mode."
endif
endif

run: all
ifneq ($(Build_Mode), HW_RELEASE)
	@$(CURDIR)/$(App_Name)
	@echo "RUN  =>  $(App_Name) [$(SGX_MODE)|$(SGX_ARCH), OK]"
endif

######## EDL Objects ########

$(Enclave_EDL_Files): $(SGX_EDGER8R) Enclave/Enclave.edl
	$(SGX_EDGER8R) --trusted Enclave/Enclave.edl --search-path $(SGX_SDK)/include --search-path ../../edl --trusted-dir Enclave
	$(SGX_EDGER8R) --untrusted Enclave/Enclave.edl --search-path $(SGX_SDK)/include --search-path ../../edl --untrusted-dir App
	@echo "GEN  =>  $(Enclave_EDL_Files)"

######## App Objects ########

App/Enclave_u.o: App/Enclave_u.c
	@$(CC) $(App_C_Flags) -c $< -o $@
	@echo "CC   <=  $<"

App/%.o: App/%.cpp
	@$(CXX) $(App_Cpp_Flags) -c $< -o $@
	@echo "CXX  <=  $<"

$(App_Name): App/Enclave_u.o $(App_Cpp_Objects) $(LIBSGX_ULIBC_A)
	@$(CXX) $< $(App_Cpp_Objects) -o $@ $(App_Link_Flags)
	@echo "LINK =>  $@"

.PHONY: $(LIBSGX_ULIBC_A)

$(LIBSGX_ULIBC_A): ../../sgx_ulibc
	@$(MAKE) -C $< > /dev/null
	@echo "MAKE <=  $<"

.config_$(Build_Mode)_$(SGX_ARCH):
	@rm -f .config_* $(App_Name) $(Enclave_Name) $(Signed_Enclave_Name) $(App_Cpp_Objects) App/Enclave_u.* $(Enclave_Cpp_Objects) Enclave/Enclave_t.*
	@touch .config_$(Build_Mode)_$(SGX_ARCH)

######## Enclave Objects ########

Enclave/Enclave_t.o: Enclave/Enclave_t.c
	@$(CC) $(Enclave_C_Flags) -c $< -o $@
	@echo "CC   <=  $<"

Enclave/%.o: Enclave/%.cpp
	@$(CXX) $(Enclave_Cpp_Flags) -c $< -o $@
	@echo "CXX  <=  $<"

$(Enclave_Name): Enclave/Enclave_t.o Enclave/src/libenclave-c.a $(LIBSGX_TLIBC_EXT_A)
	@$(CXX) $^ -o $@ $(Enclave_Link_Flags)
	@echo "LINK =>  $@"

Enclave/src/libenclave-c.a: Enclave/src/enclave.py
	@cd Enclave/src && $(PY) $(MESAPY)/rpython/bin/rpython -O2 --sgx enclave.py
	@echo "PY   <=  $<"

$(Signed_Enclave_Name): $(Enclave_Name)
	@$(SGX_ENCLAVE_SIGNER) sign -key Enclave/Enclave_private.pem -enclave $(Enclave_Name) -out $@ -config $(Enclave_Config_File)
	@echo "SIGN =>  $@"

.PHONY: $(LIBSGX_TLIBC_EXT_A)

$(LIBSGX_TLIBC_EXT_A): ../../sgx_tlibc_ext
	@$(MAKE) -C $< > /dev/null
	@echo "MAKE <=  $<"

.PHONY: clean

clean:
	@rm -rf .config_* $(App_Name) $(Enclave_Name) $(Signed_Enclave_Name) $(App_Cpp_Objects) App/Enclave_u.* $(Enclave_Cpp_Objects) Enclave/Enclave_t.* Enclave/src/libenclave-c.a
