89b5202e81
Implement uncompressed kernel support (when "None" is picked in kernel compression mode list). In that case an actual decompression code is skipped and control is passed from boot/head.S to startup_continue in kernel/head64.S. To achieve that uncompressed kernel payload is conditionally put at 0x100000 in bzImage. In reality this is very close to classic uncompressed kernel "image", but the decompressor has its own build and link process, kernel/head64.S lives at 0x100000 rather than at 0x11000, and .bss section is reused for both stages. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
81 lines
2.4 KiB
Makefile
81 lines
2.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# linux/arch/s390/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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KCOV_INSTRUMENT := n
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GCOV_PROFILE := n
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UBSAN_SANITIZE := n
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obj-y := $(if $(CONFIG_KERNEL_UNCOMPRESSED),,head.o misc.o) piggy.o
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targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
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targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
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targets += vmlinux.scr.lds $(obj-y) $(if $(CONFIG_KERNEL_UNCOMPRESSED),,sizes.h)
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KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
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KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
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OBJECTS := $(addprefix $(obj)/,$(obj-y))
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LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup -T
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$(obj)/vmlinux: $(obj)/vmlinux.lds $(objtree)/arch/s390/boot/startup.a $(OBJECTS)
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$(call if_changed,ld)
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TRIM_HEAD_SIZE := 0x100000
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sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\)$$/\#define SZ\2 (0x\1 - $(TRIM_HEAD_SIZE))/p'
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quiet_cmd_sizes = GEN $@
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cmd_sizes = $(NM) $< | sed -n $(sed-sizes) > $@
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quiet_cmd_trim_head = TRIM $@
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cmd_trim_head = tail -c +$$(($(TRIM_HEAD_SIZE) + 1)) $< > $@
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$(obj)/sizes.h: vmlinux
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$(call if_changed,sizes)
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AFLAGS_head.o += -I$(objtree)/$(obj)
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$(obj)/head.o: $(obj)/sizes.h
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CFLAGS_misc.o += -I$(objtree)/$(obj)
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$(obj)/misc.o: $(obj)/sizes.h
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OBJCOPYFLAGS_vmlinux.bin.full := -R .comment -S
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$(obj)/vmlinux.bin.full: vmlinux
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$(call if_changed,objcopy)
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$(obj)/vmlinux.bin: $(obj)/vmlinux.bin.full
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$(call if_changed,trim_head)
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vmlinux.bin.all-y := $(obj)/vmlinux.bin
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suffix-$(CONFIG_KERNEL_GZIP) := .gz
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suffix-$(CONFIG_KERNEL_BZIP2) := .bz2
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suffix-$(CONFIG_KERNEL_LZ4) := .lz4
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suffix-$(CONFIG_KERNEL_LZMA) := .lzma
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suffix-$(CONFIG_KERNEL_LZO) := .lzo
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suffix-$(CONFIG_KERNEL_XZ) := .xz
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$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y)
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$(call if_changed,gzip)
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$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y)
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$(call if_changed,bzip2)
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$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y)
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$(call if_changed,lz4)
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$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y)
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$(call if_changed,lzma)
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$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y)
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$(call if_changed,lzo)
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$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y)
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$(call if_changed,xzkern)
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LDFLAGS_piggy.o := -r --format binary --oformat $(LD_BFD) -T
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$(obj)/piggy.o: $(obj)/vmlinux.scr.lds $(obj)/vmlinux.bin$(suffix-y)
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$(call if_changed,ld)
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chkbss := $(filter-out $(obj)/misc.o $(obj)/piggy.o,$(OBJECTS))
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chkbss-target := $(obj)/vmlinux.bin
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include $(srctree)/arch/s390/scripts/Makefile.chkbss
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