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 KBUILD_IMAGE    = $(boot)/vmlinux
  11
  12 #
  13 # Select the object file format to substitute into the linker script.
  14 #
  15 64bit-tool-archpref     = loongarch64
  16 32bit-bfd               = elf32-loongarch
  17 64bit-bfd               = elf64-loongarch
  18 32bit-emul              = elf32loongarch
  19 64bit-emul              = elf64loongarch
  20
  21 ifdef CONFIG_64BIT
  22 tool-archpref           = $(64bit-tool-archpref)
  23 UTS_MACHINE             := loongarch64
  24 endif
  25
  26 ifneq ($(SUBARCH),$(ARCH))
  27   ifeq ($(CROSS_COMPILE),)
  28     CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  29   endif
  30 endif
  31
  32 ifdef CONFIG_64BIT
  33 ld-emul                 = $(64bit-emul)
  34 cflags-y                += -mabi=lp64s
  35 endif
  36
  37 cflags-y                        += -G0 -pipe -msoft-float
  38 LDFLAGS_vmlinux                 += -G0 -static -n -nostdlib
  39 KBUILD_AFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  40 KBUILD_CFLAGS_KERNEL            += -Wa,-mla-global-with-pcrel
  41 KBUILD_AFLAGS_MODULE            += -Wa,-mla-global-with-abs
  42 KBUILD_CFLAGS_MODULE            += -fplt -Wa,-mla-global-with-abs,-mla-local-with-abs
  43
  44 cflags-y += -ffreestanding
  45 cflags-y += $(call cc-option, -mno-check-zero-division)
  46
  47 load-y          = 0x9000000000200000
  48 bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y)
  49
  50 drivers-$(CONFIG_PCI)           += arch/loongarch/pci/
  51
  52 KBUILD_AFLAGS   += $(cflags-y)
  53 KBUILD_CFLAGS   += $(cflags-y)
  54 KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y)
  55
  56 # This is required to get dwarf unwinding tables into .debug_frame
  57 # instead of .eh_frame so we don't discard them.
  58 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
  59
  60 # Don't emit unaligned accesses.
  61 # Not all LoongArch cores support unaligned access, and as kernel we can't
  62 # rely on others to provide emulation for these accesses.
  63 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  64
  65 KBUILD_CFLAGS += -isystem $(shell $(CC) -print-file-name=include)
  66
  67 KBUILD_LDFLAGS  += -m $(ld-emul)
  68
  69 ifdef CONFIG_LOONGARCH
  70 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
  71         egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
  72         sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
  73 endif
  74
  75 head-y := arch/loongarch/kernel/head.o
  76
  77 libs-y += arch/loongarch/lib/
  78
  79 ifeq ($(KBUILD_EXTMOD),)
  80 prepare: vdso_prepare
  81 vdso_prepare: prepare0
  82         $(Q)$(MAKE) $(build)=arch/loongarch/vdso include/generated/vdso-offsets.h
  83 endif
  84
  85 PHONY += vdso_install
  86 vdso_install:
  87         $(Q)$(MAKE) $(build)=arch/loongarch/vdso $@
  88
  89 all:    $(KBUILD_IMAGE)
  90
  91 $(KBUILD_IMAGE): vmlinux
  92         $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $@
  93
  94 install:
  95         $(Q)install -D -m 755 $(KBUILD_IMAGE) $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
  96         $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
  97         $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
  98
  99 define archhelp
 100         echo '  install              - install kernel into $(INSTALL_PATH)'
 101         echo
 102 endef