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 # Check if the toolchain supports Zicbom extension
  60 toolchain-supports-zicbom := $(call cc-option-yn, -march=$(riscv-march-y)_zicbom)
  61 riscv-march-$(toolchain-supports-zicbom) := $(riscv-march-y)_zicbom
  62
  63 KBUILD_CFLAGS += -march=$(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    := $(boot)/Image.gz
 107 endif
 108
 109 head-y := arch/riscv/kernel/head.o
 110
 111 libs-y += arch/riscv/lib/
 112 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 113
 114 PHONY += vdso_install
 115 vdso_install:
 116         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 117         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 118                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 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         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 126                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 127
 128 endif
 129 endif
 130
 131 ifneq ($(CONFIG_XIP_KERNEL),y)
 132 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 133 KBUILD_IMAGE := $(boot)/loader.bin
 134 else
 135 KBUILD_IMAGE := $(boot)/Image.gz
 136 endif
 137 endif
 138 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 139
 140 all:    $(notdir $(KBUILD_IMAGE))
 141
 142 $(BOOT_TARGETS): vmlinux
 143         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 144         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 145
 146 Image.%: Image
 147         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 148
 149 install: KBUILD_IMAGE := $(boot)/Image
 150 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 151 install zinstall:
 152         $(call cmd,install)
 153
 154 PHONY += rv32_randconfig
 155 rv32_randconfig:
 156         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 157                 -f $(srctree)/Makefile randconfig
 158
 159 PHONY += rv64_randconfig
 160 rv64_randconfig:
 161         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 162                 -f $(srctree)/Makefile randconfig
 163
 164 PHONY += rv32_defconfig
 165 rv32_defconfig:
 166         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config