1 # collect all of our C and assembly source files

2 csrc = $(wildcard src/boot/*.c) $(wildcard src/*.c) $(wildcard src/klibc/*.c)

3 asmsrc = $(wildcard src/boot/*.S) $(wildcard src/*.S) $(wildcard src/klibc/*.S)

4 dep = $(asmsrc:.S=.d) $(csrc:.c=.d)

5

6 # each source file will generate one object file

7 obj = $(asmsrc:.S=.o) $(csrc:.c=.o)

8

9 CC = gcc

10

11 inc = -Isrc -Isrc/klibc -Isrc/boot

12

13 # -nostdinc instructs the compiler to ignore standard include directories

14 # -m32 instructs the compiler to produce 32bit code (in case we have a 64bit compiler)

15 CFLAGS = -O0 -m32 -Wall -g -nostdinc -fno-builtin $(inc)

16 ASFLAGS = -m32 -g -nostdinc -fno-builtin $(inc)

17

18 bin = kernel.elf

19

20 # default target: make an ELF binary by linking the object files

21 # we need to specify where to assume the text section (code) is going

22 # in memory, as well as the kernel entry point (kentry).

23 $(bin): $(obj)

24 ld -melf_i386 -o $@ -Ttext 0x100000 -e kentry $(obj) -Map link.map

25

26 %.s: %.c

27 $(CC) $(CFLAGS) -S -o $@ $<

28

29 -include $(dep)

30

31 %.d: %.c

32 @$(CPP) $(CFLAGS) -MM -MT $(@:.d=.o) $< >$@

33

34 %.d: %.S

35 @$(CPP) $(ASFLAGS) -MM -MT $(@:.d=.o) $< >$@

36

37 .PHONY: clean

38 clean:

39 rm -f $(obj) $(bin)

40

41 .PHONY: cleandep

42 cleandep:

43 rm -f $(dep)