adc0b7fbf6
my gcc 5.1 used an ldgr instruction with a register != 0,2,4,6 for spilling/filling into a floating point register in our decompressor. This will cause an AFP-register data exception as the decompressor did not setup the additional floating point registers via cr0. That causes a program check loop that looked like a hang with one "Uncompressing Linux... " message (directly booted via kvm) or a loop of "Uncompressing Linux... " messages (when booted via zipl boot loader). The offending code in my build was 48e400: e3 c0 af ff ff 71 lay %r12,-1(%r10) -->48e406: b3 c1 00 1c ldgr %f1,%r12 48e40a: ec 6c 01 22 02 7f clij %r6,2,12,0x48e64e but gcc could do spilling into an fpr at any function. We can simply disable floating point support at that early stage. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: stable@vger.kernel.org
70 lines
2.1 KiB
Makefile
70 lines
2.1 KiB
Makefile
#
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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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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 += misc.o piggy.o sizes.h head.o
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KBUILD_CFLAGS := -m64 -D__KERNEL__ $(LINUX_INCLUDE) -O2
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
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KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks -msoft-float
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KBUILD_CFLAGS += $(call cc-option,-mpacked-stack)
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KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
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GCOV_PROFILE := n
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OBJECTS := $(addprefix $(objtree)/arch/s390/kernel/, head.o sclp.o ebcdic.o)
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OBJECTS += $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o
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LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup -T
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$(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS)
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$(call if_changed,ld)
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@:
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sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\)$$/\#define SZ\2 0x\1/p'
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quiet_cmd_sizes = GEN $@
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cmd_sizes = $(NM) $< | sed -n $(sed-sizes) > $@
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$(obj)/sizes.h: vmlinux
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$(call if_changed,sizes)
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AFLAGS_head.o += -I$(obj)
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$(obj)/head.o: $(obj)/sizes.h
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CFLAGS_misc.o += -I$(obj)
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$(obj)/misc.o: $(obj)/sizes.h
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OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
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$(obj)/vmlinux.bin: vmlinux
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$(call if_changed,objcopy)
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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 $(obj)/vmlinux.bin.$(suffix-y)
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$(call if_changed,ld)
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