OPENOCD_HOST ?= localhost
OPENOCD_PORT_GDB ?= 3333
OPENOCD_PORT_TELNET ?= 4444
PREFIX ?= arm-none-eabi-

CC = $(PREFIX)gcc
CFLAGS = -mcpu=arm1176jzf-s -Wall -O2
LDFLAGS = -T rpi.ld -nostartfiles -Wl,-Map=rpi.map -Wl,--cref
GDB ?= $(PREFIX)gdb
PYTHON3 ?= python3
NC ?= nc

default: all

all: rpi.elf rpi.img

rpi.o: rpi.c
	$(CC) $(CFLAGS) -c -o "$@" "$<"

vectors.o: vectors.s
	$(CC) -mcpu=arm1176jzf-s -c -o "$@" "$<"

#jazelle.S: ../jazelle.c
#	$(CC) $(CFLAGS) -S -o "$@" "$<"

jazelle.o: ../jazelle.c
	$(CC) $(CFLAGS) -c -o "$@" "$<"

nl-glue.o: nl-glue.c
	$(CC) $(CFLAGS) -c -o "$@" "$<"

rpi.elf: rpi.o vectors.o nl-glue.o jazelle.o
	$(CC) $(CFLAGS) $(LDFLAGS) -o "$@" $^

rpi.img: rpi.elf
	$(PREFIX)objcopy -O binary "$<" "$@"

openocd-launch:
	openocd -f interface/cmsis-dap.cfg -c "transport select jtag" \
        -c "adapter speed 50" -f target/bcm2835.cfg \
        -c init -c scan_chain

openocd-load: rpi.elf
	printf 'halt\nload_image rpi.elf\nexit\n' \
        | nc $(OPENOCD_HOST) $(OPENOCD_PORT_TELNET)

gdb:
	$(GDB) -ex 'target extended-remote $(OPENOCD_HOST):$(OPENOCD_PORT_GDB)' \
        -ex 'set $$pc=_start' \
        $(GDB_EXTRA_CMDS) \
        rpi.elf

clean:
	@$(RM) -v rpi.o rpi.elf vectors.o jazelle.o nl-glue.o rpi.img

.PHONY: all clean openocd-launch openocd-load gdb