.SUFFIXES:
.SUFFIXES: .c .S .o .elf

TOP    != pwd
PREFIX	= /usr/local
TARGET	= riscv64-unknown-linux-musl
CROSS	= ./tools/bin/${TARGET}

include config.mk

COPT	= -g -O2
CFLAGS	= ${CFLAGS_OS} ${COPT} -std=c2x -Wall -Wextra
LDFLAGS	= ${LDFLAGS_OS} -lpthread

OBJ	= src/linurv.o src/ecall.o src/cpu.o src/exec.o src/signal.o src/data.o
T	= signal
PROGS	= examples/test.elf	\
	  examples/echo.elf	\
	  examples/cat.elf	\
	  examples/hello.elf	\
	  examples/asm.elf	\
	  examples/signal.elf	\
	  examples/true.elf

all: linurv ${PROGS}

config:
	@echo "CC=${CC}"
	@echo "CXX=${CXX}"
	@echo "SUDO=${SUDO}"
	@echo "CFLAGS=${CFLAGS}"
	@echo "LDFLAGS=${LDFLAGS}"
	@echo "CHROOT=${CHROOT}"

od: examples/$T.elf
	${CROSS}-objdump -d examples/$T.elf | less

od-bb:
	${CROSS}-objdump -d rootfs/bb/bin/busybox | less

run: linurv ${PROGS}
	mkdir -p rootfs/bin
	cp -f linurv rootfs/bin/
	for f in ${PROGS:.elf=}; do cp -f $$f.elf rootfs/bin/$$(basename "$$f"); done
	cp -f test.txt rootfs/
	${CHROOT} rootfs /bin/linurv -v /bin/$T

distclean: clean
	(cd tools; ${MAKE} distclean)

clean:
	rm -f linurv src/*.o examples/*.elf *.core src/syscalls.h src/signal-bootstrap-code.h src/sbc.* src/data.[ch]
	rm -rf rootfs

install: linurv
	mkdir -p ${DESTDIR}${PREFIX}/bin
	cp -f linurv ${DESTDIR}${PREFIX}/bin/

linurv: ${OBJ}
	${CC} -o $@ ${OBJ} ${LDFLAGS}

${OBJ}: src/linurv.h src/data.h
src/ecall.o: src/syscalls.h

src/cpu.o: src/signal-bootstrap-code.h

src/syscalls.h: src/syscalls.inc src/gensyscalls.sh
	sh src/gensyscalls.sh < src/syscalls.inc > $@

.c.o:
	${CC} -c -o $@ $< ${CFLAGS}

src/signal-bootstrap-code.h: src/signal-bootstrap-code.S
	${CROSS}-as -o src/sbc.o src/signal-bootstrap-code.S
	${CROSS}-objcopy -O binary src/sbc.o src/sbc.bin
	hexdump -v -e '16/1 "0x%02x," "\n"' <src/sbc.bin  >$@
	rm -f src/sbc.*

.c.elf:
	${CROSS}-gcc -g -o $@ $< -Og

.S.elf:
	${CROSS}-gcc -g -o $@ $<

src/data.c src/data.h: src/data.dst
	(cd src && ../tools/bin/destruct -e little -H data.h -o data.c data.dst)