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 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
  41         KBUILD_CFLAGS += -mno-relax
  42         KBUILD_AFLAGS += -mno-relax
  43 ifndef CONFIG_AS_IS_LLVM
  44         KBUILD_CFLAGS += -Wa,-mno-relax
  45         KBUILD_AFLAGS += -Wa,-mno-relax
  46 endif
  47 endif
  48 endif
  49
  50 # ISA string setting
  51 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  52 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  53 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  54 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  55
  56 # Newer binutils versions default to ISA spec version 20191213 which moves some
  57 # instructions from the I extension to the Zicsr and Zifencei extensions.
  58 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
  59 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
  60
  61 # Check if the toolchain supports Zicbom extension
  62 toolchain-supports-zicbom := $(call cc-option-yn, -march=$(riscv-march-y)_zicbom)
  63 riscv-march-$(toolchain-supports-zicbom) := $(riscv-march-y)_zicbom
  64
  65 # Check if the toolchain supports Zihintpause extension
  66 toolchain-supports-zihintpause := $(call cc-option-yn, -march=$(riscv-march-y)_zihintpause)
  67 riscv-march-$(toolchain-supports-zihintpause) := $(riscv-march-y)_zihintpause
  68
  69 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  70 KBUILD_AFLAGS += -march=$(riscv-march-y)
  71
  72 KBUILD_CFLAGS += -mno-save-restore
  73 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  74
  75 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  76         KBUILD_CFLAGS += -mcmodel=medlow
  77 endif
  78 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  79         KBUILD_CFLAGS += -mcmodel=medany
  80 endif
  81 ifeq ($(CONFIG_PERF_EVENTS),y)
  82         KBUILD_CFLAGS += -fno-omit-frame-pointer
  83 endif
  84
  85 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  86 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  87
  88 # GCC versions that support the "-mstrict-align" option default to allowing
  89 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  90 # RISC-V ISA, they're emulated by machine mode traps on all extant
  91 # architectures.  It's faster to have GCC emit only aligned accesses.
  92 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  93
  94 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  95 prepare: stack_protector_prepare
  96 stack_protector_prepare: prepare0
  97         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  98                                 -mstack-protector-guard-reg=tp            \
  99                                 -mstack-protector-guard-offset=$(shell    \
 100                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 101                                         include/generated/asm-offsets.h))
 102 endif
 103
 104 # arch specific predefines for sparse
 105 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 106
 107 # Default target when executing plain make
 108 boot            := arch/riscv/boot
 109 ifeq ($(CONFIG_XIP_KERNEL),y)
 110 KBUILD_IMAGE := $(boot)/xipImage
 111 else
 112 KBUILD_IMAGE    := $(boot)/Image.gz
 113 endif
 114
 115 libs-y += arch/riscv/lib/
 116 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 117
 118 PHONY += vdso_install
 119 vdso_install:
 120         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 121         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 122                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 123
 124 ifeq ($(KBUILD_EXTMOD),)
 125 ifeq ($(CONFIG_MMU),y)
 126 prepare: vdso_prepare
 127 vdso_prepare: prepare0
 128         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 129         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 130                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 131
 132 endif
 133 endif
 134
 135 ifneq ($(CONFIG_XIP_KERNEL),y)
 136 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 137 KBUILD_IMAGE := $(boot)/loader.bin
 138 else
 139 ifeq ($(CONFIG_EFI_ZBOOT),)
 140 KBUILD_IMAGE := $(boot)/Image.gz
 141 else
 142 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 143 endif
 144 endif
 145 endif
 146 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 147
 148 all:    $(notdir $(KBUILD_IMAGE))
 149
 150 $(BOOT_TARGETS): vmlinux
 151         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 152         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 153
 154 Image.%: Image
 155         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 156
 157 install: KBUILD_IMAGE := $(boot)/Image
 158 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 159 install zinstall:
 160         $(call cmd,install)
 161
 162 PHONY += rv32_randconfig
 163 rv32_randconfig:
 164         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 165                 -f $(srctree)/Makefile randconfig
 166
 167 PHONY += rv64_randconfig
 168 rv64_randconfig:
 169         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 170                 -f $(srctree)/Makefile randconfig
 171
 172 PHONY += rv32_defconfig
 173 rv32_defconfig:
 174         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config