1 # SPDX-License-Identifier: GPL-2.0
3 # Author: Huacai Chen <chenhuacai@loongson.cn>
4 # Copyright (C) 2020-2022 Loongson Technology Corporation Limited
6 boot := arch/loongarch/boot
8 KBUILD_DEFCONFIG := loongson3_defconfig
10 image-name-y := vmlinux
11 image-name-$(CONFIG_EFI_ZBOOT) := vmlinuz
13 ifndef CONFIG_EFI_STUB
14 KBUILD_IMAGE := $(boot)/vmlinux.elf
16 KBUILD_IMAGE := $(boot)/$(image-name-y).efi
20 # Select the object file format to substitute into the linker script.
22 64bit-tool-archpref = loongarch64
23 32bit-bfd = elf32-loongarch
24 64bit-bfd = elf64-loongarch
25 32bit-emul = elf32loongarch
26 64bit-emul = elf64loongarch
28 ifdef CONFIG_DYNAMIC_FTRACE
29 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
30 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
34 tool-archpref = $(64bit-tool-archpref)
35 UTS_MACHINE := loongarch64
38 ifneq ($(SUBARCH),$(ARCH))
39 ifeq ($(CROSS_COMPILE),)
40 CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux- $(tool-archpref)-linux-gnu- $(tool-archpref)-unknown-linux-gnu-)
45 ld-emul = $(64bit-emul)
46 cflags-y += -mabi=lp64s
49 cflags-y += -G0 -pipe -msoft-float
50 LDFLAGS_vmlinux += -G0 -static -n -nostdlib
52 # When the assembler supports explicit relocation hint, we must use it.
53 # GCC may have -mexplicit-relocs off by default if it was built with an old
54 # assembler, so we force it via an option.
56 # When the assembler does not supports explicit relocation hint, we can't use
57 # it. Disable it if the compiler supports it.
59 # If you've seen "unknown reloc hint" message building the kernel and you are
60 # now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the
61 # combination of a "new" assembler and "old" compiler is not supported. Either
62 # upgrade the compiler or downgrade the assembler.
63 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
64 cflags-y += -mexplicit-relocs
65 KBUILD_CFLAGS_KERNEL += -mdirect-extern-access
67 cflags-y += $(call cc-option,-mno-explicit-relocs)
68 KBUILD_AFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
69 KBUILD_CFLAGS_KERNEL += -Wa,-mla-global-with-pcrel
70 KBUILD_AFLAGS_MODULE += -Wa,-mla-global-with-abs
71 KBUILD_CFLAGS_MODULE += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
74 ifeq ($(CONFIG_RELOCATABLE),y)
75 KBUILD_CFLAGS_KERNEL += -fPIE
76 LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext
79 cflags-y += -ffreestanding
80 cflags-y += $(call cc-option, -mno-check-zero-division)
82 load-y = 0x9000000000200000
83 bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y)
85 drivers-$(CONFIG_PCI) += arch/loongarch/pci/
87 KBUILD_AFLAGS += $(cflags-y)
88 KBUILD_CFLAGS += $(cflags-y)
89 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
91 # This is required to get dwarf unwinding tables into .debug_frame
92 # instead of .eh_frame so we don't discard them.
93 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
95 ifdef CONFIG_ARCH_STRICT_ALIGN
96 # Don't emit unaligned accesses.
97 # Not all LoongArch cores support unaligned access, and as kernel we can't
98 # rely on others to provide emulation for these accesses.
99 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
101 # Optimise for performance on hardware supports unaligned access.
102 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
105 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
107 KBUILD_LDFLAGS += -m $(ld-emul)
109 ifdef CONFIG_LOONGARCH
110 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
111 grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
112 sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
115 libs-y += arch/loongarch/lib/
116 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
118 drivers-y += arch/loongarch/crypto/
120 # suspend and hibernation support
121 drivers-$(CONFIG_PM) += arch/loongarch/power/
123 ifeq ($(KBUILD_EXTMOD),)
124 prepare: vdso_prepare
125 vdso_prepare: prepare0
126 $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
129 PHONY += vdso_install
131 $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
133 all: $(notdir $(KBUILD_IMAGE))
135 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
136 $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
139 $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
140 $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
141 $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
144 echo ' install - install kernel into $(INSTALL_PATH)'