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 ($(CONFIG_DYNAMIC_FTRACE),y)
  14         LDFLAGS_vmlinux := --no-relax
  15 endif
  16 KBUILD_AFLAGS_MODULE += -fPIC
  17 KBUILD_CFLAGS_MODULE += -fPIC
  18
  19 KBUILD_DEFCONFIG = defconfig
  20
  21 export BITS
  22 ifeq ($(CONFIG_ARCH_RV64I),y)
  23         BITS := 64
  24         UTS_MACHINE := riscv64
  25
  26         KBUILD_CFLAGS += -mabi=lp64
  27         KBUILD_AFLAGS += -mabi=lp64
  28
  29         KBUILD_CFLAGS   += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
  30
  31         KBUILD_MARCH = rv64im
  32         KBUILD_LDFLAGS += -melf64lriscv
  33 else
  34         BITS := 32
  35         UTS_MACHINE := riscv32
  36
  37         KBUILD_CFLAGS += -mabi=ilp32
  38         KBUILD_AFLAGS += -mabi=ilp32
  39         KBUILD_MARCH = rv32im
  40         KBUILD_LDFLAGS += -melf32lriscv
  41 endif
  42
  43 KBUILD_CFLAGS += -Wall
  44
  45 ifeq ($(CONFIG_RISCV_ISA_A),y)
  46         KBUILD_ARCH_A = a
  47 endif
  48 ifeq ($(CONFIG_RISCV_ISA_C),y)
  49         KBUILD_ARCH_C = c
  50 endif
  51
  52 KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C)
  53
  54 KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C)
  55 KBUILD_CFLAGS += -mno-save-restore
  56 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  57
  58 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  59         KBUILD_CFLAGS += -mcmodel=medlow
  60 endif
  61 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  62         KBUILD_CFLAGS += -mcmodel=medany
  63 endif
  64 ifeq ($(CONFIG_MODULE_SECTIONS),y)
  65         KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
  66 endif
  67
  68 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  69
  70 # GCC versions that support the "-mstrict-align" option default to allowing
  71 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  72 # RISC-V ISA, they're emulated by machine mode traps on all extant
  73 # architectures.  It's faster to have GCC emit only aligned accesses.
  74 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  75
  76 # arch specific predefines for sparse
  77 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  78
  79 head-y := arch/riscv/kernel/head.o
  80
  81 core-y += arch/riscv/kernel/ arch/riscv/mm/
  82
  83 libs-y += arch/riscv/lib/
  84
  85 PHONY += vdso_install
  86 vdso_install:
  87         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
  88
  89 all: vmlinux