Proxmox-Port/linux-loongson
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson synced 2025-08-27 06:50:37 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
loongarch-next
linux-loongson/arch/loongarch/Makefile
Tiezhu Yang 5dfea6644d LoongArch: Pass annotate-tablejump option if LTO is enabled 
When compiling with LLVM and CONFIG_LTO_CLANG is set, there exist many
objtool warnings "sibling call from callable instruction with modified
stack frame".

For this special case, the related object file shows that there is no
generated relocation section '.rela.discard.tablejump_annotate' for the
table jump instruction jirl, thus objtool can not know that what is the
actual destination address.

It needs to do something on the LLVM side to make sure that there is the
relocation section '.rela.discard.tablejump_annotate' if LTO is enabled,
but in order to maintain compatibility for the current LLVM compiler,
this can be done in the kernel Makefile for now. Ensure it is aware of
linker with LTO, '--loongarch-annotate-tablejump' needs to be passed via
'-mllvm' to ld.lld.

Note that it should also pass the compiler option -mannotate-tablejump
rather than only pass '-mllvm --loongarch-annotate-tablejump' to ld.lld
if LTO is enabled, otherwise there are no jump info for some table jump
instructions.

Fixes: e20ab7d454 ("LoongArch: Enable jump table for objtool")
Closes: https://lore.kernel.org/loongarch/20250731175655.GA1455142@ax162/
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Co-developed-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2025-08-20 22:23:15 +08:00

201 lines
6.9 KiB
Makefile
Raw Permalink Blame History

# SPDX-License-Identifier: GPL-2.0
#
# Author: Huacai Chen <chenhuacai@loongson.cn>
# Copyright (C) 2020-2022 Loongson Technology Corporation Limited
boot := arch/loongarch/boot
KBUILD_DEFCONFIG := loongson3_defconfig
KBUILD_DTBS := dtbs
image-name-y := vmlinux
image-name-$(CONFIG_EFI_ZBOOT) := vmlinuz
ifndef CONFIG_EFI_STUB
KBUILD_IMAGE := $(boot)/vmlinux.elf
else
KBUILD_IMAGE := $(boot)/$(image-name-y).efi
endif
#
# Select the object file format to substitute into the linker script.
#
64bit-tool-archpref = loongarch64
32bit-bfd = elf32-loongarch
64bit-bfd = elf64-loongarch
32bit-emul = elf32loongarch
64bit-emul = elf64loongarch
CC_FLAGS_FPU := -mfpu=64
CC_FLAGS_NO_FPU := -msoft-float
ifdef CONFIG_UNWINDER_ORC
orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
orc_hash_sh := $(srctree)/scripts/orc_hash.sh
targets += $(orc_hash_h)
quiet_cmd_orc_hash = GEN $@
cmd_orc_hash = mkdir -p $(dir $@); \
$(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
$(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
$(call if_changed,orc_hash)
archprepare: $(orc_hash_h)
endif
ifdef CONFIG_DYNAMIC_FTRACE
KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
CC_FLAGS_FTRACE := -fpatchable-function-entry=2
endif
ifdef CONFIG_64BIT
tool-archpref = $(64bit-tool-archpref)
UTS_MACHINE := loongarch64
endif
ifneq ($(SUBARCH),$(ARCH))
ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-)
endif
endif
ifdef CONFIG_64BIT
ld-emul = $(64bit-emul)
cflags-y += -mabi=lp64s -mcmodel=normal
endif
cflags-y += -pipe $(CC_FLAGS_NO_FPU)
LDFLAGS_vmlinux += -static -n -nostdlib
# When the assembler supports explicit relocation hint, we must use it.
# GCC may have -mexplicit-relocs off by default if it was built with an old
# assembler, so we force it via an option.
#
# When the assembler does not supports explicit relocation hint, we can't use
# it. Disable it if the compiler supports it.
#
# The combination of a "new" assembler and "old" GCC is not supported, given
# the rarity of this combo and the extra complexity needed to make it work.
# Either upgrade the compiler or downgrade the assembler; the build will error
# out if it is the case (by probing for the model attribute; all supported
# compilers in this case would have support).
#
# Also, -mdirect-extern-access is useful in case of building with explicit
# relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
# support though.
ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
cflags-y += $(call cc-option,-mexplicit-relocs)
KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access)
KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdirect-access-external-data)
KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data)
KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data)
else
cflags-y += $(call cc-option,-mno-explicit-relocs)
KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
endif
KBUILD_AFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_CFLAGS += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
KBUILD_AFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
KBUILD_CFLAGS += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
ifdef CONFIG_OBJTOOL
ifdef CONFIG_CC_HAS_ANNOTATE_TABLEJUMP
# The annotate-tablejump option can not be passed to LLVM backend when LTO is enabled.
# Ensure it is aware of linker with LTO, '--loongarch-annotate-tablejump' also needs to
# be passed via '-mllvm' to ld.lld.
KBUILD_CFLAGS += -mannotate-tablejump
ifdef CONFIG_LTO_CLANG
KBUILD_LDFLAGS += -mllvm --loongarch-annotate-tablejump
endif
else
KBUILD_CFLAGS += -fno-jump-tables # keep compatibility with older compilers
endif
endif
KBUILD_RUSTFLAGS += --target=loongarch64-unknown-none-softfloat -Ccode-model=small
KBUILD_RUSTFLAGS_KERNEL += -Zdirect-access-external-data=yes
KBUILD_RUSTFLAGS_MODULE += -Zdirect-access-external-data=no
ifeq ($(CONFIG_RELOCATABLE),y)
KBUILD_CFLAGS_KERNEL += -fPIE
KBUILD_RUSTFLAGS_KERNEL += -Crelocation-model=pie
LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
endif
cflags-y += $(call cc-option, -mno-check-zero-division)
ifndef CONFIG_KASAN
cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
endif
load-y = 0x9000000000200000
bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
drivers-$(CONFIG_PCI) += arch/loongarch/pci/
KBUILD_AFLAGS += $(cflags-y)
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
# This is required to get dwarf unwinding tables into .debug_frame
# instead of .eh_frame so we don't discard them.
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
ifdef CONFIG_ARCH_STRICT_ALIGN
# Don't emit unaligned accesses.
# Not all LoongArch cores support unaligned access, and as kernel we can't
# rely on others to provide emulation for these accesses.
KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
else
# Optimise for performance on hardware supports unaligned access.
KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
endif
KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
KBUILD_LDFLAGS += -m $(ld-emul)
ifdef need-compiler
CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
endif
libs-y += arch/loongarch/lib/
libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
drivers-y += arch/loongarch/crypto/
# suspend and hibernation support
drivers-$(CONFIG_PM) += arch/loongarch/power/
ifeq ($(KBUILD_EXTMOD),)
prepare: vdso_prepare
vdso_prepare: prepare0
$(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
endif
vdso-install-y += arch/loongarch/vdso/vdso.so.dbg
all: $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS)
vmlinuz.efi: vmlinux.efi
vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
install:
$(call cmd,install)
define archhelp
echo ' vmlinux.elf - Uncompressed ELF kernel image (arch/loongarch/boot/vmlinux.elf)'
echo ' vmlinux.efi - Uncompressed EFI kernel image (arch/loongarch/boot/vmlinux.efi)'
echo ' vmlinuz.efi - GZIP/ZSTD-compressed EFI kernel image (arch/loongarch/boot/vmlinuz.efi)'
echo ' Default when CONFIG_EFI_ZBOOT=y'
echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
echo ' (distribution) /sbin/$(INSTALLKERNEL) or install.sh to $$(INSTALL_PATH)'
echo
endef
Reference in New Issue View Git Blame Copy Permalink