Makefile 4.8 KB

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  1. # Makefile for making ELF bootable images for booting on CHRP
  2. # using Open Firmware.
  3. #
  4. # Geert Uytterhoeven September 1997
  5. #
  6. # Based on coffboot by Paul Mackerras
  7. # Simplified for ppc64 by Todd Inglett
  8. #
  9. # NOTE: this code is built for 32 bit in ELF32 format even though
  10. # it packages a 64 bit kernel. We do this to simplify the
  11. # bootloader and increase compatibility with OpenFirmware.
  12. #
  13. # To this end we need to define BOOTCC, etc, as the tools
  14. # needed to build the 32 bit image. These are normally HOSTCC,
  15. # but may be a third compiler if, for example, you are cross
  16. # compiling from an intel box. Once the 64bit ppc gcc is
  17. # stable it will probably simply be a compiler switch to
  18. # compile for 32bit mode.
  19. # To make it easier to setup a cross compiler,
  20. # CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
  21. # in the toplevel makefile.
  22. HOSTCC := gcc
  23. BOOTCFLAGS := $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem $(shell $(CROSS32CC) -print-file-name=include)
  24. BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
  25. BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
  26. OBJCOPYFLAGS := contents,alloc,load,readonly,data
  27. src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
  28. src-boot := $(addprefix $(obj)/, $(src-boot))
  29. obj-boot := $(addsuffix .o, $(basename $(src-boot)))
  30. quiet_cmd_bootcc = BOOTCC $@
  31. cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
  32. quiet_cmd_bootas = BOOTAS $@
  33. cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
  34. quiet_cmd_bootld = BOOTLD $@
  35. cmd_bootld = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(2)
  36. $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
  37. $(call if_changed_dep,bootcc)
  38. $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
  39. $(call if_changed_dep,bootas)
  40. #-----------------------------------------------------------
  41. # ELF sections within the zImage bootloader/wrapper
  42. #-----------------------------------------------------------
  43. required := vmlinux.strip
  44. initrd := initrd
  45. obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
  46. src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
  47. gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
  48. hostprogs-y := addnote addRamDisk
  49. targets += zImage.vmode zImage.initrd.vmode zImage zImage.initrd imagesize.c \
  50. $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
  51. $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
  52. $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
  53. vmlinux.initrd
  54. extra-y := initrd.o
  55. quiet_cmd_ramdisk = RAMDISK $@
  56. cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
  57. quiet_cmd_stripvm = STRIP $@
  58. cmd_stripvm = $(STRIP) -s $< -o $@
  59. vmlinux.strip: vmlinux FORCE
  60. $(call if_changed,stripvm)
  61. $(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE
  62. $(call if_changed,ramdisk)
  63. quiet_cmd_addsection = ADDSEC $@
  64. cmd_addsection = $(CROSS32OBJCOPY) $@ \
  65. --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(patsubst %.o,%.gz, $@) \
  66. --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(OBJCOPYFLAGS)
  67. quiet_cmd_imagesize = GENSIZE $@
  68. cmd_imagesize = ls -l vmlinux.strip | \
  69. awk '{printf "/* generated -- do not edit! */\n" "unsigned long vmlinux_filesize = %d;\n", $$5}' \
  70. > $(obj)/imagesize.c && \
  71. $(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \
  72. awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' >> $(obj)/imagesize.c
  73. quiet_cmd_addnote = ADDNOTE $@
  74. cmd_addnote = $(obj)/addnote $@
  75. $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
  76. $(call if_changed,gzip)
  77. $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
  78. cp -f $(obj)/ramdisk.image.gz $@
  79. $(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
  80. @touch $@
  81. $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE
  82. $(call if_changed_dep,bootcc)
  83. $(call cmd,addsection)
  84. $(obj)/zImage.vmode: obj-boot += $(call obj-sec, $(required))
  85. $(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) FORCE
  86. $(call cmd,bootld,$(obj-boot))
  87. $(obj)/zImage.initrd.vmode: obj-boot += $(call obj-sec, $(required) $(initrd))
  88. $(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) FORCE
  89. $(call cmd,bootld,$(obj-boot))
  90. $(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote FORCE
  91. @cp -f $< $@
  92. $(call if_changed,addnote)
  93. $(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote FORCE
  94. @cp -f $< $@
  95. $(call if_changed,addnote)
  96. $(obj)/imagesize.c: vmlinux.strip
  97. $(call cmd,imagesize)
  98. install: $(CONFIGURE) $(BOOTIMAGE)
  99. sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
  100. clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)