linux-yocto/arch/s390/Makefile
Sumanth Korikkar 7a30bbd36c s390: Fix linker error when -no-pie option is unavailable
commit 991a20173a upstream.

The kernel build may fail if the linker does not support -no-pie option,
as it always included in LDFLAGS_vmlinux.

Error log:
s390-linux-ld: unable to disambiguate: -no-pie (did you mean --no-pie ?)

Although the GNU linker defaults to -no-pie, the ability to explicitly
specify this option was introduced in binutils 2.36.

Hence, fix it by adding -no-pie to LDFLAGS_vmlinux only when it is
available.

Cc: stable@vger.kernel.org
Fixes: 00cda11d3b ("s390: Compile kernel with -fPIC and link with -no-pie")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503220342.T3fElO9L-lkp@intel.com/
Suggested-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-04-20 10:15:59 +02:00

5.8 KiB

SPDX-License-Identifier: GPL-2.0

s390/Makefile

This file is included by the global makefile so that you can add your own

architecture-specific flags and dependencies.

Copyright (C) 1994 by Linus Torvalds

LD_BFD := elf64-s390 KBUILD_LDFLAGS := -m elf64_s390 KBUILD_AFLAGS_MODULE += -fPIC KBUILD_CFLAGS_MODULE += -fPIC KBUILD_AFLAGS += -m64 KBUILD_CFLAGS += -m64 KBUILD_CFLAGS += -fPIC LDFLAGS_vmlinux := $(call ld-option,-no-pie) --emit-relocs --discard-none extra_tools := relocs aflags_dwarf := -Wa,-gdwarf-2 KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__ ifndef CONFIG_AS_IS_LLVM KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf)) endif KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2 -mpacked-stack -std=gnu11 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY KBUILD_CFLAGS_DECOMPRESSOR += -D__DECOMPRESSOR KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbackchain KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector KBUILD_CFLAGS_DECOMPRESSOR += -fPIE KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,)) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_CC_NO_ARRAY_BOUNDS),-Wno-array-bounds)

UTS_MACHINE := s390x STACK_SIZE := $(if $(CONFIG_KASAN),65536,$(if $(CONFIG_KMSAN),65536,16384)) CHECKFLAGS += -D__s390__ -D__s390x__

export LD_BFD

mflags-$(CONFIG_MARCH_Z10) := -march=z10 mflags-$(CONFIG_MARCH_Z196) := -march=z196 mflags-$(CONFIG_MARCH_ZEC12) := -march=zEC12 mflags-$(CONFIG_MARCH_Z13) := -march=z13 mflags-$(CONFIG_MARCH_Z14) := -march=z14 mflags-$(CONFIG_MARCH_Z15) := -march=z15 mflags-$(CONFIG_MARCH_Z16) := -march=z16

export CC_FLAGS_MARCH := $(mflags-y)

aflags-y += $(mflags-y) cflags-y += $(mflags-y)

cflags-$(CONFIG_MARCH_Z10_TUNE) += -mtune=z10 cflags-$(CONFIG_MARCH_Z196_TUNE) += -mtune=z196 cflags-$(CONFIG_MARCH_ZEC12_TUNE) += -mtune=zEC12 cflags-$(CONFIG_MARCH_Z13_TUNE) += -mtune=z13 cflags-$(CONFIG_MARCH_Z14_TUNE) += -mtune=z14 cflags-$(CONFIG_MARCH_Z15_TUNE) += -mtune=z15 cflags-$(CONFIG_MARCH_Z16_TUNE) += -mtune=z16

cflags-y += -Wa,-I$(srctree)/arch/$(ARCH)/include

Prevent tail-call optimizations, to get clearer backtraces:

cflags-$(CONFIG_FRAME_POINTER) += -fno-optimize-sibling-calls

KBUILD_AFLAGS_DECOMPRESSOR += $(aflags-y) KBUILD_CFLAGS_DECOMPRESSOR += $(cflags-y)

ifneq ($(call cc-option,-mstack-size=8192 -mstack-guard=128),) CC_FLAGS_CHECK_STACK := -mstack-size=$(STACK_SIZE) ifeq ($(call cc-option,-mstack-size=8192),) CC_FLAGS_CHECK_STACK += -mstack-guard=$(CONFIG_STACK_GUARD) endif export CC_FLAGS_CHECK_STACK cflags-$(CONFIG_CHECK_STACK) += $(CC_FLAGS_CHECK_STACK) endif

ifdef CONFIG_EXPOLINE ifdef CONFIG_EXPOLINE_EXTERN CC_FLAGS_EXPOLINE := -mindirect-branch=thunk-extern CC_FLAGS_EXPOLINE += -mfunction-return=thunk-extern else CC_FLAGS_EXPOLINE := -mindirect-branch=thunk CC_FLAGS_EXPOLINE += -mfunction-return=thunk endif CC_FLAGS_EXPOLINE += -mindirect-branch-table export CC_FLAGS_EXPOLINE cflags-y += $(CC_FLAGS_EXPOLINE) -DCC_USING_EXPOLINE aflags-y += -DCC_USING_EXPOLINE endif

ifdef CONFIG_FUNCTION_TRACER ifeq ($(call cc-option,-mfentry -mnop-mcount),) # make use of hotpatch feature if the compiler supports it cc_hotpatch := -mhotpatch=0,3 ifneq ($(call cc-option,$(cc_hotpatch)),) CC_FLAGS_FTRACE := $(cc_hotpatch) KBUILD_AFLAGS += -DCC_USING_HOTPATCH KBUILD_CFLAGS += -DCC_USING_HOTPATCH endif endif endif

Test CFI features of binutils

cfi := $(call as-instr,.cfi_startproc\n.cfi_val_offset 15$(comma)-160\n.cfi_endproc,-DCONFIG_AS_CFI_VAL_OFFSET=1)

KBUILD_CFLAGS += -mpacked-stack -mbackchain -msoft-float $(cflags-y) KBUILD_CFLAGS += -pipe -Wno-sign-compare KBUILD_CFLAGS += -fno-asynchronous-unwind-tables $(cfi) KBUILD_AFLAGS += $(aflags-y) $(cfi) export KBUILD_AFLAGS_DECOMPRESSOR export KBUILD_CFLAGS_DECOMPRESSOR

OBJCOPYFLAGS := -O binary

libs-y += arch/s390/lib/

boot := arch/s390/boot syscalls := arch/s390/kernel/syscalls tools := arch/s390/tools

all: bzImage

#KBUILD_IMAGE is necessary for packaging targets like rpm-pkg, deb-pkg... KBUILD_IMAGE := $(boot)/bzImage

install: $(call cmd,install)

bzImage: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

zfcpdump: $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

archheaders: $(Q)$(MAKE) $(build)=$(syscalls) uapi

archprepare: $(Q)$(MAKE) $(build)=$(syscalls) kapi $(Q)$(MAKE) $(build)=$(tools) kapi $(extra_tools) ifeq ($(KBUILD_EXTMOD),)

We need to generate vdso-offsets.h before compiling certain files in kernel/.

In order to do that, we should use the archprepare target, but we can't since

asm-offsets.h is included in some files used to generate vdso-offsets.h, and

asm-offsets.h is built in prepare0, for which archprepare is a dependency.

Therefore we need to generate the header after prepare0 has been made, hence

this hack.

prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/s390/kernel/vdso64 include/generated/vdso64-offsets.h $(if $(CONFIG_COMPAT),$(Q)$(MAKE)
$(build)=arch/s390/kernel/vdso32 include/generated/vdso32-offsets.h)

vdso-install-y += arch/s390/kernel/vdso64/vdso64.so.dbg vdso-install-$(CONFIG_COMPAT) += arch/s390/kernel/vdso32/vdso32.so.dbg

endif

Don't use tabs in echo arguments

define archhelp echo '* bzImage - Kernel image for IPL ($(boot)/bzImage)' echo ' install - Install kernel using' echo ' (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH)' endef