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_CFLAGS_KERNEL            += $(call cc-option,-fdirect-access-external-data)
  72 KBUILD_AFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  73 KBUILD_CFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  74 KBUILD_AFLAGS_MODULE            += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  75 KBUILD_CFLAGS_MODULE            += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  76 else
  77 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  78 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  79 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  80 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  81 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  82 endif
  83
  84 ifeq ($(CONFIG_RELOCATABLE),y)
  85 KBUILD_CFLAGS_KERNEL            += -fPIE
  86 LDFLAGS_vmlinux                 += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
  87 endif
  88
  89 cflags-y += $(call cc-option, -mno-check-zero-division)
  90
  91 ifndef CONFIG_KASAN
  92 cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
  93 endif
  94
  95 load-y          = 0x9000000000200000
  96 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
  97
  98 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
  99
 100 KBUILD_AFLAGS   += $(cflags-y)
 101 KBUILD_CFLAGS   += $(cflags-y)
 102 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
 103
 104 # This is required to get dwarf unwinding tables into .debug_frame
 105 # instead of .eh_frame so we don't discard them.
 106 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 107
 108 ifdef CONFIG_ARCH_STRICT_ALIGN
 109 # Don't emit unaligned accesses.
 110 # Not all LoongArch cores support unaligned access, and as kernel we can't
 111 # rely on others to provide emulation for these accesses.
 112 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 113 else
 114 # Optimise for performance on hardware supports unaligned access.
 115 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
 116 endif
 117
 118 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 119
 120 KBUILD_LDFLAGS  += -m $(ld-emul)
 121
 122 ifdef need-compiler
 123 CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 124         grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 125         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 126 endif
 127
 128 libs-y += arch/loongarch/lib/
 129 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 130
 131 drivers-y               += arch/loongarch/crypto/
 132
 133 # suspend and hibernation support
 134 drivers-$(CONFIG_PM)    += arch/loongarch/power/
 135
 136 ifeq ($(KBUILD_EXTMOD),)
 137 prepare: vdso_prepare
 138 vdso_prepare: prepare0
 139         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 140 endif
 141
 142 vdso-install-y += arch/loongarch/vdso/vdso.so.dbg
 143
 144 all:    $(notdir $(KBUILD_IMAGE))
 145
 146 vmlinuz.efi: vmlinux.efi
 147
 148 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 149         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 150
 151 install:
 152         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
 153         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 154         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 155
 156 define archhelp
 157         echo '  install              - install kernel into $(INSTALL_PATH)'
 158         echo
 159 endef