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 CC_FLAGS_FPU            := -mfpu=64
  30 CC_FLAGS_NO_FPU         := -msoft-float
  31
  32 ifdef CONFIG_UNWINDER_ORC
  33 orc_hash_h := arch/$(SRCARCH)/include/generated/asm/orc_hash.h
  34 orc_hash_sh := $(srctree)/scripts/orc_hash.sh
  35 targets += $(orc_hash_h)
  36 quiet_cmd_orc_hash = GEN     $@
  37       cmd_orc_hash = mkdir -p $(dir $@); \
  38                      $(CONFIG_SHELL) $(orc_hash_sh) < $< > $@
  39 $(orc_hash_h): $(srctree)/arch/loongarch/include/asm/orc_types.h $(orc_hash_sh) FORCE
  40         $(call if_changed,orc_hash)
  41 archprepare: $(orc_hash_h)
  42 endif
  43
  44 ifdef CONFIG_DYNAMIC_FTRACE
  45 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  46 CC_FLAGS_FTRACE := -fpatchable-function-entry=2
  47 endif
  48
  49 ifdef CONFIG_64BIT
  50 tool-archpref           = $(64bit-tool-archpref)
  51 UTS_MACHINE             := loongarch64
  52 endif
  53
  54 ifneq ($(SUBARCH),$(ARCH))
  55   ifeq ($(CROSS_COMPILE),)
  56     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  57   endif
  58 endif
  59
  60 ifdef CONFIG_64BIT
  61 ld-emul                 = $(64bit-emul)
  62 cflags-y                += -mabi=lp64s -mcmodel=normal
  63 endif
  64
  65 cflags-y                        += -pipe $(CC_FLAGS_NO_FPU)
  66 LDFLAGS_vmlinux                 += -static -n -nostdlib
  67
  68 # When the assembler supports explicit relocation hint, we must use it.
  69 # GCC may have -mexplicit-relocs off by default if it was built with an old
  70 # assembler, so we force it via an option.
  71 #
  72 # When the assembler does not supports explicit relocation hint, we can't use
  73 # it.  Disable it if the compiler supports it.
  74 #
  75 # The combination of a "new" assembler and "old" GCC is not supported, given
  76 # the rarity of this combo and the extra complexity needed to make it work.
  77 # Either upgrade the compiler or downgrade the assembler; the build will error
  78 # out if it is the case (by probing for the model attribute; all supported
  79 # compilers in this case would have support).
  80 #
  81 # Also, -mdirect-extern-access is useful in case of building with explicit
  82 # relocs, for avoiding unnecessary GOT accesses. It is harmless to not have
  83 # support though.
  84 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
  85 cflags-y                        += $(call cc-option,-mexplicit-relocs)
  86 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-mdirect-extern-access)
  87 KBUILD_CFLAGS_KERNEL            += $(call cc-option,-fdirect-access-external-data)
  88 KBUILD_AFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  89 KBUILD_CFLAGS_MODULE            += $(call cc-option,-fno-direct-access-external-data)
  90 else
  91 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  92 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  93 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  94 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  95 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  96 endif
  97
  98 KBUILD_AFLAGS                   += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
  99 KBUILD_CFLAGS                   += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax)
 100 KBUILD_AFLAGS                   += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
 101 KBUILD_CFLAGS                   += $(call cc-option,-mthin-add-sub) $(call cc-option,-Wa$(comma)-mthin-add-sub)
 102
 103 ifdef CONFIG_OBJTOOL
 104 KBUILD_CFLAGS                   += -fno-jump-tables
 105 endif
 106
 107 KBUILD_RUSTFLAGS                += --target=loongarch64-unknown-none-softfloat -Ccode-model=small
 108 KBUILD_RUSTFLAGS_KERNEL         += -Zdirect-access-external-data=yes
 109 KBUILD_RUSTFLAGS_MODULE         += -Zdirect-access-external-data=no
 110
 111 ifeq ($(CONFIG_RELOCATABLE),y)
 112 KBUILD_CFLAGS_KERNEL            += -fPIE
 113 KBUILD_RUSTFLAGS_KERNEL         += -Crelocation-model=pie
 114 LDFLAGS_vmlinux                 += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
 115 endif
 116
 117 cflags-y += $(call cc-option, -mno-check-zero-division)
 118
 119 ifndef CONFIG_KASAN
 120 cflags-y += -fno-builtin-memcpy -fno-builtin-memmove -fno-builtin-memset
 121 endif
 122
 123 load-y          = 0x9000000000200000
 124 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
 125
 126 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
 127
 128 KBUILD_AFLAGS   += $(cflags-y)
 129 KBUILD_CFLAGS   += $(cflags-y)
 130 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
 131
 132 # This is required to get dwarf unwinding tables into .debug_frame
 133 # instead of .eh_frame so we don't discard them.
 134 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 135
 136 ifdef CONFIG_ARCH_STRICT_ALIGN
 137 # Don't emit unaligned accesses.
 138 # Not all LoongArch cores support unaligned access, and as kernel we can't
 139 # rely on others to provide emulation for these accesses.
 140 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 141 else
 142 # Optimise for performance on hardware supports unaligned access.
 143 KBUILD_CFLAGS += $(call cc-option,-mno-strict-align)
 144 endif
 145
 146 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
 147
 148 KBUILD_LDFLAGS  += -m $(ld-emul)
 149
 150 ifdef need-compiler
 151 CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 152         grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 153         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 154 endif
 155
 156 libs-y += arch/loongarch/lib/
 157 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 158
 159 drivers-y               += arch/loongarch/crypto/
 160
 161 # suspend and hibernation support
 162 drivers-$(CONFIG_PM)    += arch/loongarch/power/
 163
 164 ifeq ($(KBUILD_EXTMOD),)
 165 prepare: vdso_prepare
 166 vdso_prepare: prepare0
 167         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 168 endif
 169
 170 vdso-install-y += arch/loongarch/vdso/vdso.so.dbg
 171
 172 all:    $(notdir $(KBUILD_IMAGE)) $(KBUILD_DTBS)
 173
 174 vmlinuz.efi: vmlinux.efi
 175
 176 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 177         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 178
 179 install:
 180         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
 181         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 182         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 183
 184 define archhelp
 185         echo '  install              - install kernel into $(INSTALL_PATH)'
 186         echo
 187 endef