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.
   3 #
   4 # This file is subject to the terms and conditions of the GNU General Public
   5 # License.  See the file "COPYING" in the main directory of this archive
   6 # for more details.
   7 #
   8
   9 OBJCOPYFLAGS    := -O binary
  10 LDFLAGS_vmlinux :=
  11 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  12         LDFLAGS_vmlinux := --no-relax
  13         KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  14         CC_FLAGS_FTRACE := -fpatchable-function-entry=8
  15 endif
  16
  17 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  18 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  19 endif
  20
  21 export BITS
  22 ifeq ($(CONFIG_ARCH_RV64I),y)
  23         BITS := 64
  24         UTS_MACHINE := riscv64
  25
  26         KBUILD_CFLAGS += -mabi=lp64
  27         KBUILD_AFLAGS += -mabi=lp64
  28
  29         KBUILD_LDFLAGS += -melf64lriscv
  30 else
  31         BITS := 32
  32         UTS_MACHINE := riscv32
  33
  34         KBUILD_CFLAGS += -mabi=ilp32
  35         KBUILD_AFLAGS += -mabi=ilp32
  36         KBUILD_LDFLAGS += -melf32lriscv
  37 endif
  38
  39 ifeq ($(CONFIG_LD_IS_LLD),y)
  40         KBUILD_CFLAGS += -mno-relax
  41         KBUILD_AFLAGS += -mno-relax
  42 ifndef CONFIG_AS_IS_LLVM
  43         KBUILD_CFLAGS += -Wa,-mno-relax
  44         KBUILD_AFLAGS += -Wa,-mno-relax
  45 endif
  46 endif
  47
  48 # ISA string setting
  49 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  50 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  51 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  52 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  53
  54 # Newer binutils versions default to ISA spec version 20191213 which moves some
  55 # instructions from the I extension to the Zicsr and Zifencei extensions.
  56 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
  57 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
  58
  59 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  60 KBUILD_AFLAGS += -march=$(riscv-march-y)
  61
  62 KBUILD_CFLAGS += -mno-save-restore
  63 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  64
  65 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  66         KBUILD_CFLAGS += -mcmodel=medlow
  67 endif
  68 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  69         KBUILD_CFLAGS += -mcmodel=medany
  70 endif
  71 ifeq ($(CONFIG_PERF_EVENTS),y)
  72         KBUILD_CFLAGS += -fno-omit-frame-pointer
  73 endif
  74
  75 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  76
  77 # GCC versions that support the "-mstrict-align" option default to allowing
  78 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  79 # RISC-V ISA, they're emulated by machine mode traps on all extant
  80 # architectures.  It's faster to have GCC emit only aligned accesses.
  81 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  82
  83 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  84 prepare: stack_protector_prepare
  85 stack_protector_prepare: prepare0
  86         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  87                                 -mstack-protector-guard-reg=tp            \
  88                                 -mstack-protector-guard-offset=$(shell    \
  89                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  90                                         include/generated/asm-offsets.h))
  91 endif
  92
  93 # arch specific predefines for sparse
  94 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  95
  96 # Default target when executing plain make
  97 boot            := arch/riscv/boot
  98 ifeq ($(CONFIG_XIP_KERNEL),y)
  99 KBUILD_IMAGE := $(boot)/xipImage
 100 else
 101 KBUILD_IMAGE    := $(boot)/Image.gz
 102 endif
 103
 104 head-y := arch/riscv/kernel/head.o
 105
 106 core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
 107 core-$(CONFIG_KVM) += arch/riscv/kvm/
 108
 109 libs-y += arch/riscv/lib/
 110 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 111
 112 PHONY += vdso_install
 113 vdso_install:
 114         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 115
 116 ifeq ($(KBUILD_EXTMOD),)
 117 ifeq ($(CONFIG_MMU),y)
 118 prepare: vdso_prepare
 119 vdso_prepare: prepare0
 120         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 121 endif
 122 endif
 123
 124 ifneq ($(CONFIG_XIP_KERNEL),y)
 125 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 126 KBUILD_IMAGE := $(boot)/loader.bin
 127 else
 128 KBUILD_IMAGE := $(boot)/Image.gz
 129 endif
 130 endif
 131 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 132
 133 all:    $(notdir $(KBUILD_IMAGE))
 134
 135 $(BOOT_TARGETS): vmlinux
 136         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 137         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 138
 139 Image.%: Image
 140         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 141
 142 install: install-image = Image
 143 zinstall: install-image = Image.gz
 144 install zinstall:
 145         $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
 146         $(boot)/$(install-image) System.map "$(INSTALL_PATH)"
 147
 148 PHONY += rv32_randconfig
 149 rv32_randconfig:
 150         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 151                 -f $(srctree)/Makefile randconfig
 152
 153 PHONY += rv64_randconfig
 154 rv64_randconfig:
 155         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 156                 -f $(srctree)/Makefile randconfig