# C -> WASM
WASI_ROOT     := /opt/wasi-sdk
WASI_CC       := ${WASI_ROOT}/bin/clang
WASI_CFLAGS   := --target=wasm64 \
				 --sysroot=${WASI_ROOT}/share/wasi-sysroot \
				 -z stack-size=4096 \
				 -O0 -g -nostdlib \
				 -Wl,--no-entry \
				 -Wl,--initial-memory=65536 \
				 -Wl,--export-all \
				 -Wl,--export=__heap_base \
				 -Wl,--export=__data_end

# WASM -> Baremetal
WAMR          := /opt/wamr
IWASM_LIB     := /opt/wamr-libiwasm-64
CC            := gcc
# NOTE: When compiling I get "error: bp cannot be used in ‘asm’ here"
#       I could remove "ebp" from the clobber list (ARCH_ASM_CLOBBER_ALL) or
#       use the -fomit-frame-pointer flag to tell gcc it shouldn't rely on ebp for enter/leave...
CFLAGS        := -I. -O0 -g -ffunction-sections -std=c11 -fomit-frame-pointer
LDFLAGS        = $^ -Wl,--build-id=none -static -nostdlib \
		 -Wl,-rpath,${IWASM_LIB} -L${IWASM_LIB} -liwasm -lgcc
INCL          := -I${WAMR}/core/iwasm/include \
		 -I${WAMR}/core/shared/utils \
		 -I${WAMR}/core/shared/platform/baremetal
WAMRC         := /opt/wamr-wamrc/wamrc
WAMRCFLAGS    := --target=i386 --format=object
XXD           := busybox xxd


################################################################
# C -> WASM
${BUILD_DIR}/%/module.wasm: %.c
	mkdir -p $(shell dirname $@)
	${WASI_CC} ${WASI_CFLAGS} $< -o $@


################################################################
# WASM -> Native Object File
# ${BUILD_DIR}/%/system.o: ${BUILD_DIR}/%/module.wasm
# 	${WAMRC} ${WAMRCFLAGS} -o ${BUILD_DIR}/$*/system.o ${BUILD_DIR}/$*/module.wasm
#
# ${BUILD_DIR}/startup.o: arch/bochs/startup.s
# 	${CC} $< ${CFLAGS} -c -o $@
#
# ${BUILD_DIR}/%/system.elf: ${BUILD_DIR}/%/system.o ${BUILD_DIR}/startup.o
# 	${CC} ${LDFLAGS} -o $@


################################################################
# WASM -> AOT -> Loaded by Runtime
${BUILD_DIR}/%/module.aot: ${BUILD_DIR}/%/module.wasm
	${WAMRC} -o $@ $<

${BUILD_DIR}/%/module_wasm.c: ${BUILD_DIR}/%/module.aot
	${XXD} -i $< > $@

${BUILD_DIR}/%/system.o: ${BUILD_DIR}/%/module_wasm.c
	cp embed/host.c ${BUILD_DIR}/$*/module_host.c
	sed -i \
	    -e "s/__WASM_ARRAY_FILE__/module_wasm.c/g" \
	    -e "s/__WASM_ARRAY__/build_linux_$*_module_aot/g" \
	    -e "s/__WASM_ARRAY_LEN__/build_linux_$*_module_aot_len/g" \
        ${BUILD_DIR}/$*/module_host.c
	${CC} ${CFLAGS} ${INCL} -c ${BUILD_DIR}/$*/module_host.c -o $@

${BUILD_DIR}/startup.o: arch/bochs/startup.s
	${CC} $< ${CFLAGS} -c -o $@

${BUILD_DIR}/%/system.elf: ${BUILD_DIR}/%/system.o ${BUILD_DIR}/startup.o
	${CC} ${LDFLAGS} -o $@


define arch-make-targets

build-$1: ${BUILD_DIR}/$1/system.elf

gdb-$1:
	gdb --tui ${BUILD_DIR}/$1/system.elf

valgrind-$1:
	valgrind ${BUILD_DIR}/$1/system.elf

objdump-$1:
	objdump --disassemble --start-address=0x401000 --stop-address=0x401200 --disassembler-options intel --disassembler-color=on --source ${BUILD_DIR}/$1/system.elf

endef