1 ifneq ($(shell uname -m), i386)

2 # -m32 instructs the compiler to produce 32bit code

3 ccemu = -m32

4

5 ifeq ($(shell uname -s), FreeBSD)

6 ldemu = -m elf_i386_fbsd

7 else

8 ldemu = -m elf_i386

9 endif

10 endif

11

12 # collect all of our C and assembly source files

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

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

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

16

17 # each source file will generate one object file

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

19

20 CC = gcc

21

22 inc = -Isrc -Isrc/klibc -Isrc/boot -Iinclude

23

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

25 CFLAGS = $(ccemu) -Wall -g -nostdinc -fno-builtin $(inc) -DKERNEL

26 ASFLAGS = $(ccemu) -g -nostdinc -fno-builtin $(inc)

27

28 bin = kernel.elf

29

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

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

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

33 $(bin): $(obj)

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

35

36 %.s: %.c

37 $(CC) $(CFLAGS) -S -o $@ $<

38

39 -include $(dep)

40

41 %.d: %.c

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

43

44 %.d: %.S

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

46

47 .PHONY: clean

48 clean:

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

50

51 .PHONY: cleandep

52 cleandep:

53 rm -f $(dep)