968de4f026
This patch modifies the i386 kernel so that if CONFIG_RELOCATABLE is selected it will be able to be loaded at any 4K aligned address below 1G. The technique used is to compile the decompressor with -fPIC and modify it so the decompressor is fully relocatable. For the main kernel relocations are generated. Resulting in a kernel that is relocatable with no runtime overhead and no need to modify the source code. A reserved 32bit word in the parameters has been assigned to serve as a stack so we figure out where are running. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
46 lines
1.2 KiB
Makefile
46 lines
1.2 KiB
Makefile
#
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# linux/arch/i386/boot/compressed/Makefile
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#
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# create a compressed vmlinux image from the original vmlinux
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#
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targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o \
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vmlinux.bin.all vmlinux.relocs
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EXTRA_AFLAGS := -traditional
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LDFLAGS_vmlinux := -T
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CFLAGS_misc.o += -fPIC
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hostprogs-y := relocs
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$(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE
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$(call if_changed,ld)
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@:
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$(obj)/vmlinux.bin: vmlinux FORCE
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$(call if_changed,objcopy)
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quiet_cmd_relocs = RELOCS $@
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cmd_relocs = $(obj)/relocs $< > $@
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$(obj)/vmlinux.relocs: vmlinux $(obj)/relocs FORCE
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$(call if_changed,relocs)
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vmlinux.bin.all-y := $(obj)/vmlinux.bin
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vmlinux.bin.all-$(CONFIG_RELOCATABLE) += $(obj)/vmlinux.relocs
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quiet_cmd_relocbin = BUILD $@
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cmd_relocbin = cat $(filter-out FORCE,$^) > $@
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$(obj)/vmlinux.bin.all: $(vmlinux.bin.all-y) FORCE
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$(call if_changed,relocbin)
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ifdef CONFIG_RELOCATABLE
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$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin.all FORCE
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$(call if_changed,gzip)
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else
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$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
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$(call if_changed,gzip)
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endif
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LDFLAGS_piggy.o := -r --format binary --oformat elf32-i386 -T
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$(obj)/piggy.o: $(src)/vmlinux.scr $(obj)/vmlinux.bin.gz FORCE
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$(call if_changed,ld)
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