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_UNWINDER_ORC
  30 orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
  31 orc_hash_sh := $(srctree)/scripts/orc_hash.sh
  32 targets += $(orc_hash_h)
  33 quiet_cmd_orc_hash = GEN     $@
  34       cmd_orc_hash = mkdir -p $(dir $@); \
  35                      $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
  36 $(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
  37         $(call if_changed,orc_hash)
  38 archprepare: $(orc_hash_h)
  39 endif
  40
  41 ifdef CONFIG_DYNAMIC_FTRACE
  42 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  43 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
  44 endif
  45
  46 ifdef CONFIG_64BIT
  47 tool-archpref           = $(64bit-tool-archpref)
  48 UTS_MACHINE             := loongarch64
  49 endif
  50
  51 ifneq ($(SUBARCH),$(ARCH))
  52   ifeq ($(CROSS_COMPILE),)
  53     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  54   endif
  55 endif
  56
  57 ifdef CONFIG_64BIT
  58 ld-emul                 = $(64bit-emul)
  59 cflags-y                += -mabi=lp64s
  60 endif
  61
  62 cflags-y                        += -pipe -msoft-float
  63 LDFLAGS_vmlinux                 += -static -n -nostdlib
  64
  65 # When the assembler supports explicit relocation hint, we must use it.
  66 # GCC may have -mexplicit-relocs off by default if it was built with an old
  67 # assembler, so we force it via an option.
  68 #
  69 # When the assembler does not supports explicit relocation hint, we can't use
  70 # it.  Disable it if the compiler supports it.
  71 #
  72 # The combination of a "new" assembler and "old" GCC is not supported, given
  73 # the rarity of this combo and the extra complexity needed to make it work.
  74 # Either upgrade the compiler or downgrade the assembler; the build will error
  75 # out if it is the case (by probing for the model attribute; all supported
  76 # compilers in this case would have support).
  77 #
  78 # Also, -mdirect-extern-access is useful in case of building with explicit
  79 # relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
  80 # support though.
  81 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
  82 cflags-y                        += $(call cc-option,-mexplicit-relocs)
  83 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-mdirect-extern-access)
  84 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-fdirect-access-external-data)
  85 KBUILD_AFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  86 KBUILD_CFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  87 else
  88 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  89 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  90 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  91 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  92 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  93 endif
  94
  95 KBUILD_AFLAGS                   += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  96 KBUILD_CFLAGS                   += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  97 KBUILD_AFLAGS                   += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
  98 KBUILD_CFLAGS                   += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
  99
 100 ifdef CONFIG_OBJTOOL
 101 KBUILD_CFLAGS                   += -fno-jump-tables
 102 endif
 103
 104 KBUILD_RUSTFLAGS_MODULE         += -Crelocation-model=pic
 105
 106 ifeq ($(CONFIG_RELOCATABLE),y)
 107 KBUILD_CFLAGS_KERNEL            += -fPIE
 108 KBUILD_RUSTFLAGS_KERNEL         += -Crelocation-model=pie
 109 LDFLAGS_vmlinux                 += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
 110 endif
 111
 112 cflags-y += $(call cc-option, -mno-check-zero-division)
 113
 114 ifndef CONFIG_KASAN
 115 cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
 116 endif
 117
 118 load-y          = 0x9000000000200000
 119 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
 120
 121 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
 122
 123 KBUILD_AFLAGS   += $(cflags-y)
 124 KBUILD_CFLAGS   += $(cflags-y)
 125 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
 126
 127 # This is required to get dwarf unwinding tables into .debug_frame
 128 # instead of .eh_frame so we don't discard them.
 129 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 130
 131 ifdef CONFIG_ARCH_STRICT_ALIGN
 132 # Don't emit unaligned accesses.
 133 # Not all LoongArch cores support unaligned access, and as kernel we can't
 134 # rely on others to provide emulation for these accesses.
 135 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 136 else
 137 # Optimise for performance on hardware supports unaligned access.
 138 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
 139 endif
 140
 141 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 142
 143 KBUILD_LDFLAGS  += -m $(ld-emul)
 144
 145 ifdef need-compiler
 146 CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 147         grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 148         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 149 endif
 150
 151 libs-y += arch/loongarch/lib/
 152 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 153
 154 drivers-y               += arch/loongarch/crypto/
 155
 156 # suspend and hibernation support
 157 drivers-$(CONFIG_PM)    += arch/loongarch/power/
 158
 159 ifeq ($(KBUILD_EXTMOD),)
 160 prepare: vdso_prepare
 161 vdso_prepare: prepare0
 162         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 163 endif
 164
 165 vdso-install-y += arch/loongarch/vdso/vdso.so.dbg
 166
 167 all:    $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS)
 168
 169 vmlinuz.efi: vmlinux.efi
 170
 171 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 172         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 173
 174 install:
 175         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
 176         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 177         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 178
 179 define archhelp
 180         echo '  install              - install kernel into $(INSTALL_PATH)'
 181         echo
 182 endef