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_CMODEL_MEDLOW),y)
  20 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  21 endif
  22
  23 export BITS
  24 ifeq ($(CONFIG_ARCH_RV64I),y)
  25         BITS := 64
  26         UTS_MACHINE := riscv64
  27
  28         KBUILD_CFLAGS += -mabi=lp64
  29         KBUILD_AFLAGS += -mabi=lp64
  30
  31         KBUILD_LDFLAGS += -melf64lriscv
  32 else
  33         BITS := 32
  34         UTS_MACHINE := riscv32
  35
  36         KBUILD_CFLAGS += -mabi=ilp32
  37         KBUILD_AFLAGS += -mabi=ilp32
  38         KBUILD_LDFLAGS += -melf32lriscv
  39 endif
  40
  41 ifeq ($(CONFIG_LD_IS_LLD),y)
  42 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
  43         KBUILD_CFLAGS += -mno-relax
  44         KBUILD_AFLAGS += -mno-relax
  45 ifndef CONFIG_AS_IS_LLVM
  46         KBUILD_CFLAGS += -Wa,-mno-relax
  47         KBUILD_AFLAGS += -Wa,-mno-relax
  48 endif
  49 endif
  50 endif
  51
  52 # ISA string setting
  53 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  54 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  55 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  56 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  57
  58 # Newer binutils versions default to ISA spec version 20191213 which moves some
  59 # instructions from the I extension to the Zicsr and Zifencei extensions.
  60 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
  61 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
  62
  63 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  64 KBUILD_AFLAGS += -march=$(riscv-march-y)
  65
  66 KBUILD_CFLAGS += -mno-save-restore
  67 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  68
  69 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  70         KBUILD_CFLAGS += -mcmodel=medlow
  71 endif
  72 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  73         KBUILD_CFLAGS += -mcmodel=medany
  74 endif
  75 ifeq ($(CONFIG_PERF_EVENTS),y)
  76         KBUILD_CFLAGS += -fno-omit-frame-pointer
  77 endif
  78
  79 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  80 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  81
  82 # GCC versions that support the "-mstrict-align" option default to allowing
  83 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  84 # RISC-V ISA, they're emulated by machine mode traps on all extant
  85 # architectures.  It's faster to have GCC emit only aligned accesses.
  86 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  87
  88 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  89 prepare: stack_protector_prepare
  90 stack_protector_prepare: prepare0
  91         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  92                                 -mstack-protector-guard-reg=tp            \
  93                                 -mstack-protector-guard-offset=$(shell    \
  94                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  95                                         include/generated/asm-offsets.h))
  96 endif
  97
  98 # arch specific predefines for sparse
  99 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 100
 101 # Default target when executing plain make
 102 boot            := arch/riscv/boot
 103 ifeq ($(CONFIG_XIP_KERNEL),y)
 104 KBUILD_IMAGE := $(boot)/xipImage
 105 else
 106 KBUILD_IMAGE    := $(boot)/Image.gz
 107 endif
 108
 109 head-y := arch/riscv/kernel/head.o
 110
 111 core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
 112
 113 libs-y += arch/riscv/lib/
 114 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 115
 116 PHONY += vdso_install
 117 vdso_install:
 118         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 119
 120 ifeq ($(KBUILD_EXTMOD),)
 121 ifeq ($(CONFIG_MMU),y)
 122 prepare: vdso_prepare
 123 vdso_prepare: prepare0
 124         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 125 endif
 126 endif
 127
 128 ifneq ($(CONFIG_XIP_KERNEL),y)
 129 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 130 KBUILD_IMAGE := $(boot)/loader.bin
 131 else
 132 KBUILD_IMAGE := $(boot)/Image.gz
 133 endif
 134 endif
 135 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 136
 137 all:    $(notdir $(KBUILD_IMAGE))
 138
 139 $(BOOT_TARGETS): vmlinux
 140         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 141         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 142
 143 Image.%: Image
 144         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 145
 146 install: install-image = Image
 147 zinstall: install-image = Image.gz
 148 install zinstall:
 149         $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
 150         $(boot)/$(install-image) System.map "$(INSTALL_PATH)"
 151
 152 archclean:
 153         $(Q)$(MAKE) $(clean)=$(boot)