build/Makefile

   1 CFLAGS ?= -Wall -std=gnu99 -O2
   2
   3 ARM_BASE ?= arm-none-eabi
   4
   5 ARM_CC ?= $(ARM_BASE)-gcc
   6
   7 ARM_CFLAGS ?= -mcpu=cortex-a7 -ffreestanding -std=gnu11 -Wall \
   8         -Wextra $(addprefix -I, $(dirs))
   9
  10 ARM_AS ?= $(ARM_BASE)-as
  11
  12 ARM_OBJCOPY ?= $(ARM_BASE)-objcopy
  13
  14 ARM_ELFFLAGS ?= -nostdlib -lgcc
  15
  16
  17 KERNEL_STAGE2_OBJECTS := setup.o interrupt_vector.o interrupts.o \
  18         uart.o demo_functionality.o paging.o ramfs_embeddable.o \
  19         ramfs.o strings.o io.o atags.o scheduler.o
  20
  21 PL_0_TEST_OBJECTS := PL0_utils.o svc.o PL0_test.o strings.o io.o
  22
  23 LOADER_STAGE2_OBJECTS := uart.o strings.o io.o loader_stage2.o
  24
  25 RAMFS_FILES := PL0_test.img
  26
  27
  28 empty:=
  29 space:= $(empty) $(empty)
  30
  31 dirs:=$(shell find ../src/ -type d)
  32 dirs_colon:=$(subst $(space),:,$(dirs))
  33 vpath %.S $(dirs_colon)
  34 vpath %.c $(dirs_colon)
  35 vpath %.ld $(dirs_colon)
  36
  37
  38 all : kernel.img
  39
  40
  41 %.o : %.c
  42         $(if $(findstring /arm/,$<),\
  43         $(ARM_CC) $(ARM_CFLAGS),$(HOST_CC) $(HOST_CFLAGS)) -c $< -o $@
  44
  45 %.img : %.elf
  46         $(ARM_OBJCOPY) $^ -O binary $@
  47
  48 %.o: %.S
  49         $(ARM_AS) -mcpu=cortex-a7 $< -o $@
  50
  51 %_embeddable.o : %.img
  52         $(ARM_OBJCOPY) -I binary -O elf32-littlearm -B arm  $^ $@
  53
  54 %.elf : %.ld
  55         $(ARM_CC) -T $< -o $@ $(ARM_ELFFLAGS) $(filter %.o,$^)
  56
  57
  58 PL0_test.elf : $(PL_0_TEST_OBJECTS)
  59
  60 kernel.elf : kernel_stage1.o
  61
  62 kernel_stage2.elf : $(KERNEL_STAGE2_OBJECTS)
  63
  64 loader_stage2.elf : $(LOADER_STAGE2_OBJECTS)
  65
  66 loader.elf : loader_stage1.o
  67
  68
  69 kernel_stage1.o : kernel_stage2.img
  70
  71 loader_stage1.o : loader_stage2.img
  72
  73
  74 ramfs.img : makefs $(RAMFS_FILES)
  75         ./makefs $(RAMFS_FILES) > $@
  76
  77
  78 qemu-elf : kernel.elf
  79         qemu-system-arm -m 256 -M raspi2 -serial stdio -kernel $^
  80
  81 qemu-bin : kernel.img
  82         qemu-system-arm -m 256 -M raspi2 -serial stdio -kernel $^
  83
  84 qemu-loader : loader.img kernel.img pipe_image
  85         ./pipe_image | \
  86             qemu-system-arm -m 256 -M raspi2 -serial stdio -kernel $<
  87
  88 run-on-rpi : kernel.img pipe_image
  89         ./pipe_image | \
  90             sudo socat FILE:/dev/ttyUSB0,b115200,raw -
  91         sudo screen  /dev/ttyUSB0 115200,cs8,-parenb,-cstopb,-hupcl
  92
  93
  94 clean :
  95         -rm -f *.img *.elf *.o pipe_image makefs
  96
  97 .PHONY: all qemu-elf qemu-bin qemu-loader run-on-rpi clean