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 KBUILD_AFLAGS_MODULE += -fPIC
  15 KBUILD_CFLAGS_MODULE += -fPIC
  16
  17 KBUILD_DEFCONFIG = defconfig
  18
  19 export BITS
  20 ifeq ($(CONFIG_ARCH_RV64I),y)
  21         BITS := 64
  22         UTS_MACHINE := riscv64
  23
  24         KBUILD_CFLAGS += -mabi=lp64
  25         KBUILD_AFLAGS += -mabi=lp64
  26         KBUILD_MARCH = rv64im
  27         LDFLAGS += -melf64lriscv
  28 else
  29         BITS := 32
  30         UTS_MACHINE := riscv32
  31
  32         KBUILD_CFLAGS += -mabi=ilp32
  33         KBUILD_AFLAGS += -mabi=ilp32
  34         KBUILD_MARCH = rv32im
  35         LDFLAGS += -melf32lriscv
  36 endif
  37
  38 KBUILD_CFLAGS += -Wall
  39
  40 ifeq ($(CONFIG_RISCV_ISA_A),y)
  41         KBUILD_ARCH_A = a
  42 endif
  43 ifeq ($(CONFIG_RISCV_ISA_C),y)
  44         KBUILD_ARCH_C = c
  45 endif
  46
  47 KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C)
  48
  49 KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C)
  50 KBUILD_CFLAGS += -mno-save-restore
  51 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  52
  53 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  54         KBUILD_CFLAGS += -mcmodel=medlow
  55 endif
  56 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  57         KBUILD_CFLAGS += -mcmodel=medany
  58 endif
  59
  60 # GCC versions that support the "-mstrict-align" option default to allowing
  61 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  62 # RISC-V ISA, they're emulated by machine mode traps on all extant
  63 # architectures.  It's faster to have GCC emit only aligned accesses.
  64 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  65
  66 head-y := arch/riscv/kernel/head.o
  67
  68 core-y += arch/riscv/kernel/ arch/riscv/mm/
  69
  70 libs-y += arch/riscv/lib/
  71
  72 all: vmlinux