arch/riscv/Makefile

   1 # This file is included by the global makefile so that you can add your own
   2 # architecture-specific flags and dependencies. Remember to do have actions
   3 # for "archclean" and "archdep" for cleaning up and making dependencies for
   4 # this architecture
   5 #
   6 # This file is subject to the terms and conditions of the GNU General Public
   7 # License.  See the file "COPYING" in the main directory of this archive
   8 # for more details.
   9 #
  10
  11 OBJCOPYFLAGS    := -O binary
  12 LDFLAGS_vmlinux :=
  13 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  14         LDFLAGS_vmlinux := --no-relax
  15 endif
  16 KBUILD_AFLAGS_MODULE += -fPIC
  17 KBUILD_CFLAGS_MODULE += -fPIC
  18
  19 export BITS
  20 ifeq ($(CONFIG_ARCH_RV64I),y)
  21         BITS := 64
  22         UTS_MACHINE := riscv64
  23
  24         KBUILD_CFLAGS += -mabi=lp64
  25         KBUILD_AFLAGS += -mabi=lp64
  26
  27         KBUILD_LDFLAGS += -melf64lriscv
  28 else
  29         BITS := 32
  30         UTS_MACHINE := riscv32
  31
  32         KBUILD_CFLAGS += -mabi=ilp32
  33         KBUILD_AFLAGS += -mabi=ilp32
  34         KBUILD_LDFLAGS += -melf32lriscv
  35 endif
  36
  37 # ISA string setting
  38 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  39 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  40 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  41 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  42 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  43 KBUILD_AFLAGS += -march=$(riscv-march-y)
  44
  45 KBUILD_CFLAGS += -mno-save-restore
  46 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  47
  48 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  49         KBUILD_CFLAGS += -mcmodel=medlow
  50 endif
  51 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  52         KBUILD_CFLAGS += -mcmodel=medany
  53 endif
  54 ifeq ($(CONFIG_MODULE_SECTIONS),y)
  55         KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds
  56 endif
  57 ifeq ($(CONFIG_PERF_EVENTS),y)
  58         KBUILD_CFLAGS += -fno-omit-frame-pointer
  59 endif
  60
  61 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  62
  63 # GCC versions that support the "-mstrict-align" option default to allowing
  64 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  65 # RISC-V ISA, they're emulated by machine mode traps on all extant
  66 # architectures.  It's faster to have GCC emit only aligned accesses.
  67 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  68
  69 # arch specific predefines for sparse
  70 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  71
  72 # Default target when executing plain make
  73 boot            := arch/riscv/boot
  74 KBUILD_IMAGE    := $(boot)/Image.gz
  75
  76 head-y := arch/riscv/kernel/head.o
  77
  78 core-y += arch/riscv/
  79
  80 libs-y += arch/riscv/lib/
  81
  82 PHONY += vdso_install
  83 vdso_install:
  84         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
  85
  86 all: Image.gz
  87
  88 Image: vmlinux
  89         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
  90
  91 Image.%: Image
  92         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
  93
  94 zinstall install:
  95         $(Q)$(MAKE) $(build)=$(boot) $@