MAKEFLAGS += -R -r
export PATH := $(CURDIR)/tools/gnu/bin:$(PATH)

CROSS	  = riscv32-unknown-elf-
CC	  = $(CROSS)gcc
LD	  = $(CROSS)ld
OBJCOPY   = $(CROSS)objcopy
PERL      = perl
INCLUDE   = -I. -I./include
CPPFLAGS  = $(INCLUDE) \
	     -march=rv32imc -mabi=ilp32 -mdiv -Os -ggdb3 \
	     -fwrapv -fvisibility=hidden -fno-strict-aliasing \
	     -fno-pic -mno-plt -msmall-data-limit=8192 \
	     -frename-registers \
	     -mshorten-memrefs -mno-strict-align
# These require newlib to be built with the same options; would be nice
CPPFLAGS_NOT = -fshort-enums -fshort-wchar
CFLAGS    = $(CPPFLAGS)
SFLAGS    = $(CPPFLAGS) -D__ASSEMBLY__
LDFLAGS   = $(CFLAGS) \
	    -Wl,--section-start=.init=0 -Wl,-q \
	    -Wl,-z,common-page-size=16 -Wl,-z,max-page-size=16

# Delete output files on error
.DELETE_ON_ERROR:

# Don't delete intermediate files
.SECONDARY:

all: boot.mif

# Generate MIF files for 4 8×2K RAMs
boot_depth  := 2048
boot_width  := 8
boot_stride := 4

boot.elf: head.o hello.o

%.mif: %.bin bin2mif.pl
	$(PERL) bin2mif.pl $< $@ $($*_depth) $($*_width) $($*_stride)

%.hex: %.elf
	$(OBJCOPY) -O ihex $< $@

%.mem: %.bin
	$(BIN2MEM) $< > $@

%.bin: %.elf
	$(OBJCOPY) -O binary $< $@

%.elf:
	$(CC) $(LDFLAGS) -o $@ $^

%.o: %.c
	$(CC) $(CFLAGS) $(CFLAGS_$<) -c -o $@ $<

%.s: %.c
	$(CC) $(CFLAGS) $(CFLAGS_$<) -S -o $@ $<

%.i: %.c
	$(CC) $(CFLAGS) $(CFLAGS_$<) -E -o $@ $<

%.o: %.S
	$(CC) $(SFLAGS) $(SFLAGS_$<) -c -o $@ $<

%.s: %.S
	$(CC) $(SFLAGS) $(SFLAGS_$<) -E -o $@ $<

clean:
	rm -f *.o *.i *.s *.elf *.bin

spotless: clean
	rm -f *.mem *.hex *.mif