CMAKE_MINIMUM_REQUIRED(VERSION 3.13 FATAL_ERROR)



SET(BOARD "iss" CACHE STRING "board to be compiled for")

SET(RISCV_ARCH "rv32imc" CACHE STRING "arch")
SET(RISCV_ABI "ilp32" CACHE STRING "abi")

EXECUTE_PROCESS(    
    COMMAND which riscv64-unknown-elf-gcc
    OUTPUT_VARIABLE COMPILER
    OUTPUT_STRIP_TRAILING_WHITESPACE)

GET_FILENAME_COMPONENT(TOOL_DIR ${COMPILER} DIRECTORY)

SET(TRIPLET "riscv64-unknown-elf")

SET(CMAKE_C_COMPILER ${TOOL_DIR}/${TRIPLET}-gcc)
SET(CMAKE_CXX_COMPILER ${TOOL_DIR}/${TRIPLET}-g++)
SET(CMAKE_ASM_COMPILER ${TOOL_DIR}/${TRIPLET}-gcc)
SET(CMAKE_LINKER ${TOOL_DIR}/${TRIPLET}-ld)
SET(CMAKE_OBJCOPY ${TOOL_DIR}/${TRIPLET}-objcopy)
SET(CMAKE_AR ${TOOL_DIR}/${TRIPLET}-ar)

PROJECT(semihosting_test)

SET(BSP_BASE "../bare-metal-bsp")
SET(ENV_DIR ${BSP_BASE}/env)
SET(PLATFORM_DIR ${ENV_DIR}/${BOARD})

SET(SEMIHOSTING TRUE)

INCLUDE(${BSP_BASE}/libwrap/CMakeLists.txt)

INCLUDE_DIRECTORIES(
    ${BSP_BASE}/include
    ${BSP_BASE}/drivers
    ${BSP_BASE}/libwrap/semihosting
    ${ENV_DIR}
    ${PLATFORM_DIR})


# Source files
SET(ASM_SRCS
    ${ENV_DIR}/entry.S
    ${ENV_DIR}/start.S
)
SET(C_SRCS
    ${PLATFORM_DIR}/init.c
    test.c
)
SET_SOURCE_FILES_PROPERTIES(${ASM_SRCS} PROPERTIES LANGUAGE C)

# Compiler Flags
SET(COMMON_FLAGS "")

# GCC Version Check
EXECUTE_PROCESS(
    COMMAND ${CMAKE_C_COMPILER} --version
    OUTPUT_VARIABLE GCC_VERSION
)
IF(GCC_VERSION MATCHES "9.2")
    LIST(APPEND COMMON_FLAGS "-march=${RISCV_ARCH}")
ELSE()
    LIST(APPEND COMMON_FLAGS "-march=${RISCV_ARCH}_zicsr_zifencei")
ENDIF()
LIST(APPEND COMMON_FLAGS "-mabi=${RISCV_ABI}" "-mcmodel=medany" "-DBOARD_${BOARD}")

# Compiler Options
ADD_COMPILE_OPTIONS("${COMMON_FLAGS}")

ADD_EXECUTABLE(${PROJECT_NAME} ${ASM_SRCS} ${C_SRCS} ${SRC_FILES})

TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC ${LIBWRAP_TGC_LDFLAGS} LIBWRAP_TGC)

# Linker Flags
TARGET_LINK_LIBRARIES(${PROJECT_NAME}
    PUBLIC
        -march=${RISCV_ARCH} -mabi=${RISCV_ABI}
        -T/scratch/gabriel/repos/Firmwares/bare-metal-bsp/env/iss/link.lds
        -Wl,-Map=${PROJECT_NAME}.map
        -nostartfiles
        -L${ENV_DIR}
)