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 KBUILD_DTBS      := dtbs
  10
  11 image-name-y                    := vmlinux
  12 image-name-$(CONFIG_EFI_ZBOOT)  := vmlinuz
  13
  14 ifndef CONFIG_EFI_STUB
  15 KBUILD_IMAGE    := $(boot)/vmlinux.elf
  16 else
  17 KBUILD_IMAGE    := $(boot)/$(image-name-y).efi
  18 endif
  19
  20 #
  21 # Select the object file format to substitute into the linker script.
  22 #
  23 64bit-tool-archpref     = loongarch64
  24 32bit-bfd               = elf32-loongarch
  25 64bit-bfd               = elf64-loongarch
  26 32bit-emul              = elf32loongarch
  27 64bit-emul              = elf64loongarch
  28
  29 ifdef CONFIG_DYNAMIC_FTRACE
  30 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  31 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
  32 endif
  33
  34 ifdef CONFIG_64BIT
  35 tool-archpref           = $(64bit-tool-archpref)
  36 UTS_MACHINE             := loongarch64
  37 endif
  38
  39 ifneq ($(SUBARCH),$(ARCH))
  40   ifeq ($(CROSS_COMPILE),)
  41     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  42   endif
  43 endif
  44
  45 ifdef CONFIG_64BIT
  46 ld-emul                 = $(64bit-emul)
  47 cflags-y                += -mabi=lp64s
  48 endif
  49
  50 cflags-y                        += -pipe -msoft-float
  51 LDFLAGS_vmlinux                 += -static -n -nostdlib
  52
  53 # When the assembler supports explicit relocation hint, we must use it.
  54 # GCC may have -mexplicit-relocs off by default if it was built with an old
  55 # assembler, so we force it via an option.
  56 #
  57 # When the assembler does not supports explicit relocation hint, we can't use
  58 # it.  Disable it if the compiler supports it.
  59 #
  60 # The combination of a "new" assembler and "old" GCC is not supported, given
  61 # the rarity of this combo and the extra complexity needed to make it work.
  62 # Either upgrade the compiler or downgrade the assembler; the build will error
  63 # out if it is the case (by probing for the model attribute; all supported
  64 # compilers in this case would have support).
  65 #
  66 # Also, -mdirect-extern-access is useful in case of building with explicit
  67 # relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
  68 # support though.
  69 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
  70 cflags-y                        += $(call cc-option,-mexplicit-relocs)
  71 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-mdirect-extern-access)
  72 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-fdirect-access-external-data)
  73 KBUILD_AFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  74 KBUILD_CFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  75 KBUILD_AFLAGS_MODULE            += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  76 KBUILD_CFLAGS_MODULE            += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  77 else
  78 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  79 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  80 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  81 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  82 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  83 endif
  84
  85 KBUILD_RUSTFLAGS                        += --target=$(objtree)/scripts/target.json
  86 KBUILD_RUSTFLAGS_MODULE         += -Crelocation-model=pic
  87
  88 ifeq ($(CONFIG_RELOCATABLE),y)
  89 KBUILD_CFLAGS_KERNEL            += -fPIE
  90 KBUILD_RUSTFLAGS_KERNEL         += -Crelocation-model=pie
  91 LDFLAGS_vmlinux                 += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
  92 endif
  93
  94 cflags-y += $(call cc-option, -mno-check-zero-division)
  95
  96 ifndef CONFIG_KASAN
  97 cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
  98 endif
  99
 100 load-y          = 0x9000000000200000
 101 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
 102
 103 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
 104
 105 KBUILD_AFLAGS   += $(cflags-y)
 106 KBUILD_CFLAGS   += $(cflags-y)
 107 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
 108
 109 # This is required to get dwarf unwinding tables into .debug_frame
 110 # instead of .eh_frame so we don't discard them.
 111 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 112
 113 ifdef CONFIG_ARCH_STRICT_ALIGN
 114 # Don't emit unaligned accesses.
 115 # Not all LoongArch cores support unaligned access, and as kernel we can't
 116 # rely on others to provide emulation for these accesses.
 117 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 118 else
 119 # Optimise for performance on hardware supports unaligned access.
 120 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
 121 endif
 122
 123 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 124
 125 KBUILD_LDFLAGS  += -m $(ld-emul)
 126
 127 ifdef need-compiler
 128 CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 129         grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 130         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 131 endif
 132
 133 libs-y += arch/loongarch/lib/
 134 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 135
 136 drivers-y               += arch/loongarch/crypto/
 137
 138 # suspend and hibernation support
 139 drivers-$(CONFIG_PM)    += arch/loongarch/power/
 140
 141 ifeq ($(KBUILD_EXTMOD),)
 142 prepare: vdso_prepare
 143 vdso_prepare: prepare0
 144         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 145 endif
 146
 147 vdso-install-y += arch/loongarch/vdso/vdso.so.dbg
 148
 149 all:    $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS)
 150
 151 vmlinuz.efi: vmlinux.efi
 152
 153 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 154         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 155
 156 install:
 157         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
 158         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 159         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 160
 161 define archhelp
 162         echo '  install              - install kernel into $(INSTALL_PATH)'
 163         echo
 164 endef