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                        += -pipe -msoft-float
  50 LDFLAGS_vmlinux                 += -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 # The combination of a "new" assembler and "old" GCC is not supported, given
  60 # the rarity of this combo and the extra complexity needed to make it work.
  61 # Either upgrade the compiler or downgrade the assembler; the build will error
  62 # out if it is the case (by probing for the model attribute; all supported
  63 # compilers in this case would have support).
  64 #
  65 # Also, -mdirect-extern-access is useful in case of building with explicit
  66 # relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
  67 # support though.
  68 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
  69 cflags-y                        += $(call cc-option,-mexplicit-relocs)
  70 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-mdirect-extern-access)
  71 KBUILD_AFLAGS_MODULE            += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  72 KBUILD_CFLAGS_MODULE            += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  73 else
  74 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  75 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  76 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  77 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  78 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  79 endif
  80
  81 ifeq ($(CONFIG_RELOCATABLE),y)
  82 KBUILD_CFLAGS_KERNEL            += -fPIE
  83 LDFLAGS_vmlinux                 += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
  84 endif
  85
  86 cflags-y += $(call cc-option, -mno-check-zero-division)
  87
  88 ifndef CONFIG_KASAN
  89 cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
  90 endif
  91
  92 load-y          = 0x9000000000200000
  93 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
  94
  95 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
  96
  97 KBUILD_AFLAGS   += $(cflags-y)
  98 KBUILD_CFLAGS   += $(cflags-y)
  99 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
 100
 101 # This is required to get dwarf unwinding tables into .debug_frame
 102 # instead of .eh_frame so we don't discard them.
 103 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 104
 105 ifdef CONFIG_ARCH_STRICT_ALIGN
 106 # Don't emit unaligned accesses.
 107 # Not all LoongArch cores support unaligned access, and as kernel we can't
 108 # rely on others to provide emulation for these accesses.
 109 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 110 else
 111 # Optimise for performance on hardware supports unaligned access.
 112 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
 113 endif
 114
 115 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 116
 117 KBUILD_LDFLAGS  += -m $(ld-emul)
 118
 119 ifdef need-compiler
 120 CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 121         grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 122         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 123 endif
 124
 125 libs-y += arch/loongarch/lib/
 126 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 127
 128 drivers-y               += arch/loongarch/crypto/
 129
 130 # suspend and hibernation support
 131 drivers-$(CONFIG_PM)    += arch/loongarch/power/
 132
 133 ifeq ($(KBUILD_EXTMOD),)
 134 prepare: vdso_prepare
 135 vdso_prepare: prepare0
 136         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 137 endif
 138
 139 PHONY += vdso_install
 140 vdso_install:
 141         $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
 142
 143 all:    $(notdir $(KBUILD_IMAGE))
 144
 145 vmlinuz.efi: vmlinux.efi
 146
 147 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 148         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 149
 150 install:
 151         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
 152         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 153         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 154
 155 define archhelp
 156         echo '  install              - install kernel into $(INSTALL_PATH)'
 157         echo
 158 endef