mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-19 23:07:20 +07:00
81796a3c6a
It seems to be suboptimal to compress the entire image, so that we could decompress and throw away the first 68k (0x11000) during the boot process. This patch trims 0x11000 bytes during the build process and adjusts symbols in size.h accordingly. Besides making bzImage smaller, this change would also be a benefit for kaslr. It allows to decompress the kernel right to desired offset, without worrying about dead weight in front of the decompressed image. Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
83 lines
2.5 KiB
Makefile
83 lines
2.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# linux/arch/s390/boot/compressed/Makefile
|
|
#
|
|
# create a compressed vmlinux image from the original vmlinux
|
|
#
|
|
|
|
KCOV_INSTRUMENT := n
|
|
|
|
targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
|
|
targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
|
|
targets += misc.o piggy.o sizes.h head.o
|
|
|
|
KBUILD_CFLAGS := -m64 -D__KERNEL__ -O2
|
|
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
|
|
KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks -msoft-float
|
|
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
|
|
KBUILD_CFLAGS += $(call cc-option,-mpacked-stack)
|
|
KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
|
|
|
|
GCOV_PROFILE := n
|
|
UBSAN_SANITIZE := n
|
|
|
|
OBJECTS := $(addprefix $(objtree)/arch/s390/kernel/, head.o ebcdic.o als.o)
|
|
OBJECTS += $(objtree)/drivers/s390/char/sclp_early_core.o
|
|
OBJECTS += $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o
|
|
|
|
LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup -T
|
|
$(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS)
|
|
$(call if_changed,ld)
|
|
|
|
TRIM_HEAD_SIZE := 0x11000
|
|
|
|
sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\)$$/\#define SZ\2 (0x\1 - $(TRIM_HEAD_SIZE))/p'
|
|
|
|
quiet_cmd_sizes = GEN $@
|
|
cmd_sizes = $(NM) $< | sed -n $(sed-sizes) > $@
|
|
|
|
quiet_cmd_trim_head = TRIM $@
|
|
cmd_trim_head = tail -c +$$(($(TRIM_HEAD_SIZE) + 1)) $< > $@
|
|
|
|
$(obj)/sizes.h: vmlinux
|
|
$(call if_changed,sizes)
|
|
|
|
AFLAGS_head.o += -I$(objtree)/$(obj)
|
|
$(obj)/head.o: $(obj)/sizes.h
|
|
|
|
CFLAGS_misc.o += -I$(objtree)/$(obj)
|
|
$(obj)/misc.o: $(obj)/sizes.h
|
|
|
|
OBJCOPYFLAGS_vmlinux.bin.full := -R .comment -S
|
|
$(obj)/vmlinux.bin.full: vmlinux
|
|
$(call if_changed,objcopy)
|
|
|
|
$(obj)/vmlinux.bin: $(obj)/vmlinux.bin.full
|
|
$(call if_changed,trim_head)
|
|
|
|
vmlinux.bin.all-y := $(obj)/vmlinux.bin
|
|
|
|
suffix-$(CONFIG_KERNEL_GZIP) := gz
|
|
suffix-$(CONFIG_KERNEL_BZIP2) := bz2
|
|
suffix-$(CONFIG_KERNEL_LZ4) := lz4
|
|
suffix-$(CONFIG_KERNEL_LZMA) := lzma
|
|
suffix-$(CONFIG_KERNEL_LZO) := lzo
|
|
suffix-$(CONFIG_KERNEL_XZ) := xz
|
|
|
|
$(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y)
|
|
$(call if_changed,gzip)
|
|
$(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y)
|
|
$(call if_changed,bzip2)
|
|
$(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y)
|
|
$(call if_changed,lz4)
|
|
$(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y)
|
|
$(call if_changed,lzma)
|
|
$(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y)
|
|
$(call if_changed,lzo)
|
|
$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y)
|
|
$(call if_changed,xzkern)
|
|
|
|
LDFLAGS_piggy.o := -r --format binary --oformat $(LD_BFD) -T
|
|
$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y)
|
|
$(call if_changed,ld)
|