Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
23
24HOSTCC := gcc
25BOOTCFLAGS := $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem \
26 $(shell $(CROSS32CC) -print-file-name=include) -fPIC
27BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
28BOOTLFLAGS := -T $(srctree)/$(src)/zImage.lds
29OBJCOPYFLAGS := contents,alloc,load,readonly,data
30
31zlib := infblock.c infcodes.c inffast.c inflate.c inftrees.c infutil.c
32zlibheader := infblock.h infcodes.h inffast.h inftrees.h infutil.h
33zliblinuxheader := zlib.h zconf.h zutil.h
34
35$(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
36#$(addprefix $(obj)/,main.o): $(addprefix $(obj)/,zlib.h)
37
38src-boot := string.S prom.c main.c div64.S crt0.S
39src-boot += $(zlib)
40src-boot := $(addprefix $(obj)/, $(src-boot))
41obj-boot := $(addsuffix .o, $(basename $(src-boot)))
42
43BOOTCFLAGS += -I$(obj) -I$(srctree)/$(obj)
44
45quiet_cmd_copy_zlib = COPY $@
46 cmd_copy_zlib = sed "s@__attribute_used__@@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
47
48quiet_cmd_copy_zlibheader = COPY $@
49 cmd_copy_zlibheader = sed "s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
50# stddef.h for NULL
51quiet_cmd_copy_zliblinuxheader = COPY $@
52 cmd_copy_zliblinuxheader = sed "s@<linux/string.h>@\"string.h\"@;s@<linux/kernel.h>@<stddef.h>@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
53
54$(addprefix $(obj)/,$(zlib)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
55 $(call cmd,copy_zlib)
56
57$(addprefix $(obj)/,$(zlibheader)): $(obj)/%: $(srctree)/lib/zlib_inflate/%
58 $(call cmd,copy_zlibheader)
59
60$(addprefix $(obj)/,$(zliblinuxheader)): $(obj)/%: $(srctree)/include/linux/%
61 $(call cmd,copy_zliblinuxheader)
62
63clean-files := $(zlib) $(zlibheader) $(zliblinuxheader)
64
65
66quiet_cmd_bootcc = BOOTCC $@
67 cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
68
69quiet_cmd_bootas = BOOTAS $@
70 cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
71
72quiet_cmd_bootld = BOOTLD $@
73 cmd_bootld = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(2)
74
75$(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
76 $(call if_changed_dep,bootcc)
77$(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
78 $(call if_changed_dep,bootas)
79
80#-----------------------------------------------------------
81# ELF sections within the zImage bootloader/wrapper
82#-----------------------------------------------------------
83required := vmlinux.strip
84initrd := initrd
85
86obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
87src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
88gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
89
90hostprogs-y := addnote addRamDisk
91targets += zImage.vmode zImage.initrd.vmode zImage zImage.initrd \
92 $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
93 $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
94 $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
95 vmlinux.initrd
96extra-y := initrd.o
97
98quiet_cmd_ramdisk = RAMDISK $@
99 cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
100
101quiet_cmd_stripvm = STRIP $@
102 cmd_stripvm = $(STRIP) -s -R .comment $< -o $@
103
104vmlinux.strip: vmlinux
105 $(call if_changed,stripvm)
106$(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz
107 $(call if_changed,ramdisk)
108
109quiet_cmd_addsection = ADDSEC $@
110 cmd_addsection = $(CROSS32OBJCOPY) $@ \
111 --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(patsubst %.o,%.gz, $@) \
112 --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(OBJCOPYFLAGS)
113
114quiet_cmd_addnote = ADDNOTE $@
115 cmd_addnote = $(obj)/addnote $@
116
117$(call gz-sec, $(required)): $(obj)/kernel-%.gz: %
118 $(call if_changed,gzip)
119
120$(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
121 cp -f $(obj)/ramdisk.image.gz $@
122
123$(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz
124 @touch $@
125
126$(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c
127 $(call if_changed_dep,bootcc)
128 $(call cmd,addsection)
129
130$(obj)/zImage.vmode: obj-boot += $(call obj-sec, $(required))
131$(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) $(srctree)/$(src)/zImage.lds
132 $(call cmd,bootld,$(obj-boot))
133
134$(obj)/zImage.initrd.vmode: obj-boot += $(call obj-sec, $(required) $(initrd))
135$(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(srctree)/$(src)/zImage.lds
136 $(call cmd,bootld,$(obj-boot))
137
138$(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote
139 @cp -f $< $@
140 $(call if_changed,addnote)
141
142$(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote
143 @cp -f $< $@
144 $(call if_changed,addnote)
145
146install: $(CONFIGURE) $(BOOTIMAGE)
147 sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
148
149clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)