linux/arch/loongarch/Makefile

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# 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_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
endif
cflags-y += -G0 -pipe -msoft-float
LDFLAGS_vmlinux += -G0 -static -n -nostdlib
LoongArch: Adjust symbol addressing for AS_HAS_EXPLICIT_RELOCS If explicit relocation hints are used by the toolchain, -Wa,-mla-* options will be useless for the C code. So only use them for the !CONFIG_AS_HAS_EXPLICIT_RELOCS case. Replace "la" with "la.pcrel" in head.S to keep the semantic consistent with new and old toolchains for the low level startup code. For per-CPU variables, the "address" of the symbol is actually an offset from $r21. The value is near the loading address of main kernel image, but far from the loading address of modules. So we use model("extreme") attibute to tell the compiler that a PC-relative addressing with 32-bit offset is not sufficient for local per-CPU variables. The behavior with different assemblers and compilers are summarized in the following table: AS has CC has explicit relocs explicit relocs * Behavior ============================================================== No No Use la.* macros. No change from Linux 6.0. -------------------------------------------------------------- No Yes Disable explicit relocs. No change from Linux 6.0. -------------------------------------------------------------- Yes No Not supported. -------------------------------------------------------------- Yes Yes Enable explicit relocs. No -Wa,-mla* options used. ============================================================== *: We assume CC must have model attribute if it has explicit relocs. Both features are added in GCC 13 development cycle, so any GCC release >= 13 should be OK. Using early GCC 13 development snapshots may produce modules with unsupported relocations. Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=f09482a Link: https://gcc.gnu.org/r13-1834 Link: https://gcc.gnu.org/r13-2199 Tested-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-10-12 16:36:08 +08:00
# 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.
#
# If you've seen "unknown reloc hint" message building the kernel and you are
# now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the
# combination of a "new" assembler and "old" compiler is not supported. Either
# upgrade the compiler or downgrade the assembler.
ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
cflags-y += -mexplicit-relocs
KBUILD_CFLAGS_KERNEL += -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
LoongArch: Adjust symbol addressing for AS_HAS_EXPLICIT_RELOCS If explicit relocation hints are used by the toolchain, -Wa,-mla-* options will be useless for the C code. So only use them for the !CONFIG_AS_HAS_EXPLICIT_RELOCS case. Replace "la" with "la.pcrel" in head.S to keep the semantic consistent with new and old toolchains for the low level startup code. For per-CPU variables, the "address" of the symbol is actually an offset from $r21. The value is near the loading address of main kernel image, but far from the loading address of modules. So we use model("extreme") attibute to tell the compiler that a PC-relative addressing with 32-bit offset is not sufficient for local per-CPU variables. The behavior with different assemblers and compilers are summarized in the following table: AS has CC has explicit relocs explicit relocs * Behavior ============================================================== No No Use la.* macros. No change from Linux 6.0. -------------------------------------------------------------- No Yes Disable explicit relocs. No change from Linux 6.0. -------------------------------------------------------------- Yes No Not supported. -------------------------------------------------------------- Yes Yes Enable explicit relocs. No -Wa,-mla* options used. ============================================================== *: We assume CC must have model attribute if it has explicit relocs. Both features are added in GCC 13 development cycle, so any GCC release >= 13 should be OK. Using early GCC 13 development snapshots may produce modules with unsupported relocations. Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=f09482a Link: https://gcc.gnu.org/r13-1834 Link: https://gcc.gnu.org/r13-2199 Tested-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-10-12 16:36:08 +08:00
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) += $(objtree)/drivers/firmware/efi/libstub/lib.a
# suspend and hibernation support
drivers-$(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
PHONY += vdso_install
vdso_install:
$(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
all: $(notdir $(KBUILD_IMAGE))
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