091a7f20d5
commit e67e0eb6a9 upstream.
LoongArch's toolchain may change the default code model from normal to
medium. This is unnecessary for kernel, and generates some relocations
which cannot be handled by the module loader. So explicitly specify the
code model to normal in Makefile (for Rust 'normal' is 'small').
Cc: stable@vger.kernel.org
Tested-by: Haiyong Sun <sunhaiyong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4.2 KiB
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
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
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 -msoft-float 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) 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
cflags-y += -ffreestanding cflags-y += $(call cc-option, -mno-check-zero-division)
ifndef CONFIG_PHYSICAL_START load-y = 0x9000000000200000 else load-y = $(CONFIG_PHYSICAL_START) endif bootvars-y = VMLINUX_LOAD_ADDRESS=$(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
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)
KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
KBUILD_LDFLAGS += -m $(ld-emul)
ifdef CONFIG_LOONGARCH
CHECKFLAGS += $(shell $(CC) $(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) += $(objtree)/drivers/firmware/efi/libstub/lib.a
ifeq ($(KBUILD_EXTMOD),) prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h endif
PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
all: $(notdir $(KBUILD_IMAGE))
vmlinuz.efi: vmlinux.efi
vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
install: $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE) $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE) $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
define archhelp echo ' install - install kernel into $(INSTALL_PATH)' echo endef