+csrc = $(wildcard src/*.c) $(wildcard src/libc/*.c)
+ssrc = $(wildcard src/*.s) $(wildcard src/libc/*.s)
+Ssrc = $(wildcard src/*.S) $(wildcard src/libc/*.S)
+obj = $(csrc:.c=.o) $(ssrc:.s=.o) $(Ssrc:.S=.o)
+dep = $(csrc:.c=.d)
+elf = rpikern.elf
+bin = rpikern.bin
+
+ifneq ($(shell uname -m | sed 's/^arm.*/arm/'), arm)
+ toolprefix = arm-linux-gnueabihf-
+ CPP = $(toolprefix)cpp
+ CC = $(toolprefix)gcc
+ AS = $(toolprefix)as
+ LD = $(toolprefix)ld
+ OBJCOPY = $(toolprefix)objcopy
+endif
+
+warn = -pedantic -Wall
+dbg = -g
+inc = -Isrc/libc
+gccopt = -fpic -ffreestanding -nostdinc
+arch = -mcpu=arm1176jzf-s
+
+CFLAGS = $(arch) $(warn) $(opt) $(dbg) $(gccopt) $(inc) $(def)
+ASFLAGS = $(arch) $(dbg) $(inc)
+LDFLAGS = -nostdlib -T rpikern.ld -print-gc-sections
+
+QEMU_FLAGS = -m 256 -M raspi2 -serial stdio
+
+
+$(bin): $(elf)
+ $(OBJCOPY) -O binary $< $@
+
+$(elf): $(obj)
+ $(LD) -o $@ $(obj) -Map link.map $(LDFLAGS)
+
+-include $(dep)
+
+%.d: %.c
+ @echo 'gen dep $@ ...'
+ @$(CPP) $(CFLAGS) $< -MM -MT $(@:.d=.o) >$@
+
+.PHONY: clean
+clean:
+ rm -f $(obj) $(bin) $(elf) link.map
+
+.PHONY: cleandep
+cleandep:
+ rm -f $(dep)
+
+.PHONY: debug
+debug: $(elf)
+ qemu-system-arm $(QEMU_FLAGS) -kernel $(elf)