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 ($(CONFIG_DYNAMIC_FTRACE),y)
  14         LDFLAGS_vmlinux := --no-relax
  15         KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  16         CC_FLAGS_FTRACE := -fpatchable-function-entry=8
  17 endif
  18
  19 ifeq ($(CONFIG_64BIT)$(CONFIG_CMODEL_MEDLOW),yy)
  20 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  21 endif
  22
  23 export BITS
  24 ifeq ($(CONFIG_ARCH_RV64I),y)
  25         BITS := 64
  26         UTS_MACHINE := riscv64
  27
  28         KBUILD_CFLAGS += -mabi=lp64
  29         KBUILD_AFLAGS += -mabi=lp64
  30
  31         KBUILD_LDFLAGS += -melf64lriscv
  32 else
  33         BITS := 32
  34         UTS_MACHINE := riscv32
  35
  36         KBUILD_CFLAGS += -mabi=ilp32
  37         KBUILD_AFLAGS += -mabi=ilp32
  38         KBUILD_LDFLAGS += -melf32lriscv
  39 endif
  40
  41 # ISA string setting
  42 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  43 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  44 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  45 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  46 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  47 KBUILD_AFLAGS += -march=$(riscv-march-y)
  48
  49 KBUILD_CFLAGS += -mno-save-restore
  50 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  51
  52 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  53         KBUILD_CFLAGS += -mcmodel=medlow
  54 endif
  55 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  56         KBUILD_CFLAGS += -mcmodel=medany
  57 endif
  58 ifeq ($(CONFIG_PERF_EVENTS),y)
  59         KBUILD_CFLAGS += -fno-omit-frame-pointer
  60 endif
  61
  62 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  63
  64 # GCC versions that support the "-mstrict-align" option default to allowing
  65 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  66 # RISC-V ISA, they're emulated by machine mode traps on all extant
  67 # architectures.  It's faster to have GCC emit only aligned accesses.
  68 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  69
  70 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  71 prepare: stack_protector_prepare
  72 stack_protector_prepare: prepare0
  73         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  74                                 -mstack-protector-guard-reg=tp            \
  75                                 -mstack-protector-guard-offset=$(shell    \
  76                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  77                                         include/generated/asm-offsets.h))
  78 endif
  79
  80 # arch specific predefines for sparse
  81 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  82
  83 # Default target when executing plain make
  84 boot            := arch/riscv/boot
  85 KBUILD_IMAGE    := $(boot)/Image.gz
  86
  87 head-y := arch/riscv/kernel/head.o
  88
  89 core-y += arch/riscv/
  90
  91 libs-y += arch/riscv/lib/
  92 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
  93
  94 PHONY += vdso_install
  95 vdso_install:
  96         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
  97
  98 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
  99 KBUILD_IMAGE := $(boot)/loader.bin
 100 else
 101 KBUILD_IMAGE := $(boot)/Image.gz
 102 endif
 103 BOOT_TARGETS := Image Image.gz loader loader.bin
 104
 105 all:    $(notdir $(KBUILD_IMAGE))
 106
 107 $(BOOT_TARGETS): vmlinux
 108         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 109         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 110
 111 Image.%: Image
 112         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 113
 114 zinstall install:
 115         $(Q)$(MAKE) $(build)=$(boot) $@
 116
 117 archclean:
 118         $(Q)$(MAKE) $(clean)=$(boot)