7f115ff4fc
When building with OBJDUMP=llvm-objdump, there are a series of warnings from the section comparisons that arch/s390/boot/Makefile performs between vmlinux and arch/s390/boot/vmlinux: llvm-objdump: warning: section '.boot.preserved.data' mentioned in a -j/--section option, but not found in any input file llvm-objdump: warning: section '.boot.data' mentioned in a -j/--section option, but not found in any input file llvm-objdump: warning: section '.boot.preserved.data' mentioned in a -j/--section option, but not found in any input file llvm-objdump: warning: section '.boot.data' mentioned in a -j/--section option, but not found in any input file The warning is a little misleading, as these sections do exist in the input files. It is really pointing out that llvm-objdump does not match GNU objdump's behavior of respecting '-j' / '--section' in combination with '-t' / '--syms': $ s390x-linux-gnu-objdump -t -j .boot.data vmlinux.full vmlinux.full: file format elf64-s390 SYMBOL TABLE: 0000000001951000 l O .boot.data 0000000000003000 sclp_info_sccb 00000000019550e0 l O .boot.data 0000000000000001 sclp_info_sccb_valid 00000000019550e2 g O .boot.data 0000000000001000 early_command_line ... $ llvm-objdump -t -j .boot.data vmlinux.full vmlinux.full: file format elf64-s390 SYMBOL TABLE: 0000000000100040 l O .text 0000000000000010 dw_psw 0000000000000000 l df *ABS* 0000000000000000 main.c 00000000001001b0 l F .text 00000000000000c6 trace_event_raw_event_initcall_level 0000000000100280 l F .text 0000000000000100 perf_trace_initcall_level ... It may be possible to change llvm-objdump's behavior to match GNU objdump's behavior but the difficulty of that task has not yet been explored. The combination of '$(OBJDUMP) -t -j' is not common in the kernel tree on a whole, so workaround this tool difference by grepping for the sections in the full symbol table output in a similar manner to the sed invocation. This results in no visible change for GNU objdump users while fixing the warnings for OBJDUMP=llvm-objdump, further enabling use of LLVM=1 for ARCH=s390 with versions of LLVM that have support for s390 in ld.lld and llvm-objcopy. Reported-by: Heiko Carstens <hca@linux.ibm.com> Closes: https://lore.kernel.org/20240219113248.16287-C-hca@linux.ibm.com/ Link: https://github.com/ClangBuiltLinux/linux/issues/859 Signed-off-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20240220-s390-work-around-llvm-objdump-t-j-v1-1-47bb0366a831@kernel.org Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
147 lines
5.2 KiB
Makefile
147 lines
5.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the linux s390-specific parts of the memory manager.
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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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KASAN_SANITIZE := n
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KCSAN_SANITIZE := n
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KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
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KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
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#
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# Use minimum architecture for als.c to be able to print an error
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# message if the kernel is started on a machine which is too old
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#
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ifndef CONFIG_CC_IS_CLANG
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CC_FLAGS_MARCH_MINIMUM := -march=z900
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else
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CC_FLAGS_MARCH_MINIMUM := -march=z10
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endif
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ifneq ($(CC_FLAGS_MARCH),$(CC_FLAGS_MARCH_MINIMUM))
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AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH)
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AFLAGS_head.o += $(CC_FLAGS_MARCH_MINIMUM)
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AFLAGS_REMOVE_mem.o += $(CC_FLAGS_MARCH)
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AFLAGS_mem.o += $(CC_FLAGS_MARCH_MINIMUM)
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CFLAGS_REMOVE_als.o += $(CC_FLAGS_MARCH)
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CFLAGS_als.o += $(CC_FLAGS_MARCH_MINIMUM)
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CFLAGS_REMOVE_sclp_early_core.o += $(CC_FLAGS_MARCH)
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CFLAGS_sclp_early_core.o += $(CC_FLAGS_MARCH_MINIMUM)
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endif
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CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
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obj-y := head.o als.o startup.o physmem_info.o ipl_parm.o ipl_report.o vmem.o
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obj-y += string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o
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obj-y += version.o pgm_check_info.o ctype.o ipl_data.o
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obj-y += $(if $(CONFIG_PIE_BUILD),machine_kexec_reloc.o,relocs.o)
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obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE)) += uv.o
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obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
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obj-y += $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) info.o
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obj-$(CONFIG_KERNEL_ZSTD) += clz_ctz.o
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obj-all := $(obj-y) piggy.o syms.o
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targets := bzImage section_cmp.boot.data section_cmp.boot.preserved.data $(obj-y)
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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.bin.zst info.bin syms.bin vmlinux.syms $(obj-all)
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ifndef CONFIG_PIE_BUILD
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targets += relocs.S
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endif
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OBJECTS := $(addprefix $(obj)/,$(obj-y))
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OBJECTS_ALL := $(addprefix $(obj)/,$(obj-all))
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clean-files += vmlinux.map
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quiet_cmd_section_cmp = SECTCMP $*
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define cmd_section_cmp
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s1=`$(OBJDUMP) -t "$<" | grep "\s$*\s\+" | sort | \
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sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
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s2=`$(OBJDUMP) -t "$(word 2,$^)" | grep "\s$*\s\+" | sort | \
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sed -n "/0000000000000000/! s/.*\s$*\s\+//p" | sha256sum`; \
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if [ "$$s1" != "$$s2" ]; then \
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echo "error: section $* differs between $< and $(word 2,$^)" >&2; \
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exit 1; \
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fi; \
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touch $@
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endef
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$(obj)/bzImage: $(obj)/vmlinux $(obj)/section_cmp.boot.data $(obj)/section_cmp.boot.preserved.data FORCE
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$(call if_changed,objcopy)
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$(obj)/section_cmp%: vmlinux $(obj)/vmlinux FORCE
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$(call if_changed,section_cmp)
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LDFLAGS_vmlinux-$(CONFIG_LD_ORPHAN_WARN) := --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
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LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) --oformat $(LD_BFD) -e startup $(if $(CONFIG_VMLINUX_MAP),-Map=$(obj)/vmlinux.map) --build-id=sha1 -T
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$(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS_ALL) FORCE
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$(call if_changed,ld)
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LDFLAGS_vmlinux.syms := $(LDFLAGS_vmlinux-y) --oformat $(LD_BFD) -e startup -T
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$(obj)/vmlinux.syms: $(obj)/vmlinux.lds $(OBJECTS) FORCE
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$(call if_changed,ld)
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quiet_cmd_dumpsyms = DUMPSYMS $<
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define cmd_dumpsyms
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$(NM) -n -S --format=bsd "$<" | sed -nE 's/^0*([0-9a-fA-F]+) 0*([0-9a-fA-F]+) [tT] ([^ ]*)$$/\1 \2 \3/p' | tr '\n' '\0' > "$@"
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endef
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$(obj)/syms.bin: $(obj)/vmlinux.syms FORCE
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$(call if_changed,dumpsyms)
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OBJCOPYFLAGS_syms.o := -I binary -O elf64-s390 -B s390:64-bit --rename-section .data=.decompressor.syms
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$(obj)/syms.o: $(obj)/syms.bin FORCE
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$(call if_changed,objcopy)
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OBJCOPYFLAGS_info.bin := -O binary --only-section=.vmlinux.info --set-section-flags .vmlinux.info=alloc,load
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$(obj)/info.bin: vmlinux FORCE
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$(call if_changed,objcopy)
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OBJCOPYFLAGS_info.o := -I binary -O elf64-s390 -B s390:64-bit --rename-section .data=.vmlinux.info
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$(obj)/info.o: $(obj)/info.bin FORCE
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$(call if_changed,objcopy)
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OBJCOPYFLAGS_vmlinux.bin := -O binary --remove-section=.comment --remove-section=.vmlinux.info -S
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$(obj)/vmlinux.bin: vmlinux FORCE
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$(call if_changed,objcopy)
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ifndef CONFIG_PIE_BUILD
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CMD_RELOCS=arch/s390/tools/relocs
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quiet_cmd_relocs = RELOCS $@
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cmd_relocs = $(CMD_RELOCS) $< > $@
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$(obj)/relocs.S: vmlinux FORCE
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$(call if_changed,relocs)
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endif
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suffix-$(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-$(CONFIG_KERNEL_XZ) := .xz
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suffix-$(CONFIG_KERNEL_ZSTD) := .zst
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$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
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$(call if_changed,gzip)
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$(obj)/vmlinux.bin.bz2: $(obj)/vmlinux.bin FORCE
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$(call if_changed,bzip2_with_size)
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$(obj)/vmlinux.bin.lz4: $(obj)/vmlinux.bin FORCE
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$(call if_changed,lz4_with_size)
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$(obj)/vmlinux.bin.lzma: $(obj)/vmlinux.bin FORCE
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$(call if_changed,lzma_with_size)
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$(obj)/vmlinux.bin.lzo: $(obj)/vmlinux.bin FORCE
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$(call if_changed,lzo_with_size)
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$(obj)/vmlinux.bin.xz: $(obj)/vmlinux.bin FORCE
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$(call if_changed,xzkern_with_size)
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$(obj)/vmlinux.bin.zst: $(obj)/vmlinux.bin FORCE
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$(call if_changed,zstd22_with_size)
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OBJCOPYFLAGS_piggy.o := -I binary -O elf64-s390 -B s390:64-bit --rename-section .data=.vmlinux.bin.compressed
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$(obj)/piggy.o: $(obj)/vmlinux.bin$(suffix-y) FORCE
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$(call if_changed,objcopy)
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