mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-22 01:26:30 -04:00
74f8295c6f
When compiling with LLVM and CONFIG_RUST is set, there exist objtool
warnings in rust/core.o and rust/kernel.o, like this:
rust/core.o: warning: objtool:
_RNvXs1_NtNtCs5QSdWC790r4_4core5ascii10ascii_charNtB5_9AsciiCharNtNtB9_3fmt5Debug3fmt+0x54:
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.
If rustc has the option "-Cllvm-args=--loongarch-annotate-tablejump",
pass the option to enable jump tables for objtool, otherwise it should
pass "-Zno-jump-tables" to keep compatibility with older rustc.
How to test:
$ rustup component add rust-src
$ make LLVM=1 rustavailable
$ make ARCH=loongarch LLVM=1 clean defconfig
$ scripts/config -d MODVERSIONS \
-e RUST -e SAMPLES -e SAMPLES_RUST \
-e SAMPLE_RUST_CONFIGFS -e SAMPLE_RUST_MINIMAL \
-e SAMPLE_RUST_MISC_DEVICE -e SAMPLE_RUST_PRINT \
-e SAMPLE_RUST_DMA -e SAMPLE_RUST_DRIVER_PCI \
-e SAMPLE_RUST_DRIVER_PLATFORM -e SAMPLE_RUST_DRIVER_FAUX \
-e SAMPLE_RUST_DRIVER_AUXILIARY -e SAMPLE_RUST_HOSTPROGS
$ make ARCH=loongarch LLVM=1 olddefconfig all
Cc: stable@vger.kernel.org
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Reported-by: Miguel Ojeda <ojeda@kernel.org>
Closes: https://lore.kernel.org/rust-for-linux/CANiq72mNeCuPkCDrG2db3w=AX+O-zYrfprisDPmRac_qh65Dmg@mail.gmail.com/
Suggested-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
206 lines
7.0 KiB
Makefile
206 lines
7.0 KiB
Makefile
# 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
|
|
KBUILD_CFLAGS += -mannotate-tablejump
|
|
else
|
|
KBUILD_CFLAGS += -fno-jump-tables # keep compatibility with older compilers
|
|
endif
|
|
ifdef CONFIG_RUSTC_HAS_ANNOTATE_TABLEJUMP
|
|
KBUILD_RUSTFLAGS += -Cllvm-args=--loongarch-annotate-tablejump
|
|
else
|
|
KBUILD_RUSTFLAGS += -Zno-jump-tables # keep compatibility with older compilers
|
|
endif
|
|
ifdef CONFIG_LTO_CLANG
|
|
# 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_LDFLAGS += -mllvm --loongarch-annotate-tablejump
|
|
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
|