arch/loongarch/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Author: Huacai Chen <chenhuacai@loongson.cn>
   4 # Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   5
   6 boot    := arch/loongarch/boot
   7
   8 KBUILD_DEFCONFIG := loongson3_defconfig
   9
  10 image-name-y                    := vmlinux
  11 image-name-$(CONFIG_EFI_ZBOOT)  := vmlinuz
  12
  13 ifndef CONFIG_EFI_STUB
  14 KBUILD_IMAGE    := $(boot)/vmlinux.elf
  15 else
  16 KBUILD_IMAGE    := $(boot)/$(image-name-y).efi
  17 endif
  18
  19 #
  20 # Select the object file format to substitute into the linker script.
  21 #
  22 64bit-tool-archpref     = loongarch64
  23 32bit-bfd               = elf32-loongarch
  24 64bit-bfd               = elf64-loongarch
  25 32bit-emul              = elf32loongarch
  26 64bit-emul              = elf64loongarch
  27
  28 ifdef CONFIG_DYNAMIC_FTRACE
  29 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  30 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
  31 endif
  32
  33 ifdef CONFIG_64BIT
  34 tool-archpref           = $(64bit-tool-archpref)
  35 UTS_MACHINE             := loongarch64
  36 endif
  37
  38 ifneq ($(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-)
  41   endif
  42 endif
  43
  44 ifdef CONFIG_64BIT
  45 ld-emul                 = $(64bit-emul)
  46 cflags-y                += -mabi=lp64s
  47 endif
  48
  49 cflags-y                        += -G0 -pipe -msoft-float
  50 LDFLAGS_vmlinux                 += -G0 -static -n -nostdlib
  51
  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.
  55 #
  56 # When the assembler does not supports explicit relocation hint, we can't use
  57 # it.  Disable it if the compiler supports it.
  58 #
  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
  66 else
  67 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  68 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  69 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  70 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  71 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  72 endif
  73
  74 ifeq ($(CONFIG_RELOCATABLE),y)
  75 KBUILD_CFLAGS_KERNEL            += -fPIE
  76 LDFLAGS_vmlinux                 += -static -pie --no-dynamic-linker -z notext
  77 endif
  78
  79 cflags-y += -ffreestanding
  80 cflags-y += $(call cc-option, -mno-check-zero-division)
  81
  82 load-y          = 0x9000000000200000
  83 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
  84
  85 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
  86
  87 KBUILD_AFLAGS   += $(cflags-y)
  88 KBUILD_CFLAGS   += $(cflags-y)
  89 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
  90
  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
  94
  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)
 100 else
 101 # Optimise for performance on hardware supports unaligned access.
 102 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
 103 endif
 104
 105 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 106
 107 KBUILD_LDFLAGS  += -m $(ld-emul)
 108
 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')
 113 endif
 114
 115 libs-y += arch/loongarch/lib/
 116 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 117
 118 drivers-y               += arch/loongarch/crypto/
 119
 120 # suspend and hibernation support
 121 drivers-$(CONFIG_PM)    += arch/loongarch/power/
 122
 123 ifeq ($(KBUILD_EXTMOD),)
 124 prepare: vdso_prepare
 125 vdso_prepare: prepare0
 126         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 127 endif
 128
 129 PHONY += vdso_install
 130 vdso_install:
 131         $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
 132
 133 all:    $(notdir $(KBUILD_IMAGE))
 134
 135 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 136         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 137
 138 install:
 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)
 142
 143 define archhelp
 144         echo '  install              - install kernel into $(INSTALL_PATH)'
 145         echo
 146 endef