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_64BIT
  29 tool-archpref           = $(64bit-tool-archpref)
  30 UTS_MACHINE             := loongarch64
  31 endif
  32
  33 ifneq ($(SUBARCH),$(ARCH))
  34   ifeq ($(CROSS_COMPILE),)
  35     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  36   endif
  37 endif
  38
  39 ifdef CONFIG_64BIT
  40 ld-emul                 = $(64bit-emul)
  41 cflags-y                += -mabi=lp64s
  42 endif
  43
  44 cflags-y                        += -G0 -pipe -msoft-float
  45 LDFLAGS_vmlinux                 += -G0 -static -n -nostdlib
  46
  47 # When the assembler supports explicit relocation hint, we must use it.
  48 # GCC may have -mexplicit-relocs off by default if it was built with an old
  49 # assembler, so we force it via an option.
  50 #
  51 # When the assembler does not supports explicit relocation hint, we can't use
  52 # it.  Disable it if the compiler supports it.
  53 #
  54 # If you've seen "unknown reloc hint" message building the kernel and you are
  55 # now wondering why "-mexplicit-relocs" is not wrapped with cc-option: the
  56 # combination of a "new" assembler and "old" compiler is not supported.  Either
  57 # upgrade the compiler or downgrade the assembler.
  58 ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS
  59 cflags-y                        += -mexplicit-relocs
  60 KBUILD_CFLAGS_KERNEL            += -mdirect-extern-access
  61 else
  62 cflags-y                        += $(call cc-option,-mno-explicit-relocs)
  63 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  64 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  65 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  66 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  67 endif
  68
  69 cflags-y += -ffreestanding
  70 cflags-y += $(call cc-option, -mno-check-zero-division)
  71
  72 load-y          = 0x9000000000200000
  73 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
  74
  75 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
  76
  77 KBUILD_AFLAGS   += $(cflags-y)
  78 KBUILD_CFLAGS   += $(cflags-y)
  79 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
  80
  81 # This is required to get dwarf unwinding tables into .debug_frame
  82 # instead of .eh_frame so we don't discard them.
  83 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
  84
  85 # Don't emit unaligned accesses.
  86 # Not all LoongArch cores support unaligned access, and as kernel we can't
  87 # rely on others to provide emulation for these accesses.
  88 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  89
  90 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
  91
  92 KBUILD_LDFLAGS  += -m $(ld-emul)
  93
  94 ifdef CONFIG_LOONGARCH
  95 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
  96         egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
  97         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
  98 endif
  99
 100 head-y := arch/loongarch/kernel/head.o
 101
 102 libs-y += arch/loongarch/lib/
 103 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 104
 105 ifeq ($(KBUILD_EXTMOD),)
 106 prepare: vdso_prepare
 107 vdso_prepare: prepare0
 108         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
 109 endif
 110
 111 PHONY += vdso_install
 112 vdso_install:
 113         $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
 114
 115 all:    $(notdir $(KBUILD_IMAGE))
 116
 117 vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 118         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 119
 120 install:
 121         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/$(image-name-y)-$(KERNELRELEASE)
 122         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 123         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 124
 125 define archhelp
 126         echo '  install              - install kernel into $(INSTALL_PATH)'
 127         echo
 128 endef