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