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 := -z norelro
  11 ifeq ($(CONFIG_RELOCATABLE),y)
  12         LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs
  13         KBUILD_CFLAGS += -fPIE
  14 endif
  15 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  16         LDFLAGS_vmlinux += --no-relax
  17         KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  18 ifeq ($(CONFIG_RISCV_ISA_C),y)
  19         CC_FLAGS_FTRACE := -fpatchable-function-entry=4
  20 else
  21         CC_FLAGS_FTRACE := -fpatchable-function-entry=2
  22 endif
  23 endif
  24
  25 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  26 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  27 endif
  28
  29 export BITS
  30 ifeq ($(CONFIG_ARCH_RV64I),y)
  31         BITS := 64
  32         UTS_MACHINE := riscv64
  33
  34         KBUILD_CFLAGS += -mabi=lp64
  35         KBUILD_AFLAGS += -mabi=lp64
  36
  37         KBUILD_LDFLAGS += -melf64lriscv
  38 else
  39         BITS := 32
  40         UTS_MACHINE := riscv32
  41
  42         KBUILD_CFLAGS += -mabi=ilp32
  43         KBUILD_AFLAGS += -mabi=ilp32
  44         KBUILD_LDFLAGS += -melf32lriscv
  45 endif
  46
  47 ifeq ($(CONFIG_LD_IS_LLD),y)
  48 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y)
  49         KBUILD_CFLAGS += -mno-relax
  50         KBUILD_AFLAGS += -mno-relax
  51 ifndef CONFIG_AS_IS_LLVM
  52         KBUILD_CFLAGS += -Wa,-mno-relax
  53         KBUILD_AFLAGS += -Wa,-mno-relax
  54 endif
  55 endif
  56 endif
  57
  58 # ISA string setting
  59 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  60 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  61 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  62 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  63
  64 # Newer binutils versions default to ISA spec version 20191213 which moves some
  65 # instructions from the I extension to the Zicsr and Zifencei extensions.
  66 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
  67 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
  68
  69 # Check if the toolchain supports Zihintpause extension
  70 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  71
  72 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  73 KBUILD_AFLAGS += -march=$(riscv-march-y)
  74
  75 KBUILD_CFLAGS += -mno-save-restore
  76 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  77
  78 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  79         KBUILD_CFLAGS += -mcmodel=medlow
  80 endif
  81 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  82         KBUILD_CFLAGS += -mcmodel=medany
  83 endif
  84 ifeq ($(CONFIG_PERF_EVENTS),y)
  85         KBUILD_CFLAGS += -fno-omit-frame-pointer
  86 endif
  87
  88 # Avoid generating .eh_frame sections.
  89 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  90
  91 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  92 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  93
  94 # GCC versions that support the "-mstrict-align" option default to allowing
  95 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  96 # RISC-V ISA, they're emulated by machine mode traps on all extant
  97 # architectures.  It's faster to have GCC emit only aligned accesses.
  98 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  99
 100 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 101 prepare: stack_protector_prepare
 102 stack_protector_prepare: prepare0
 103         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 104                                 -mstack-protector-guard-reg=tp            \
 105                                 -mstack-protector-guard-offset=$(shell    \
 106                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 107                                         include/generated/asm-offsets.h))
 108 endif
 109
 110 # arch specific predefines for sparse
 111 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 112
 113 # Default target when executing plain make
 114 boot            := arch/riscv/boot
 115 ifeq ($(CONFIG_XIP_KERNEL),y)
 116 KBUILD_IMAGE := $(boot)/xipImage
 117 else
 118 KBUILD_IMAGE    := $(boot)/Image.gz
 119 endif
 120
 121 libs-y += arch/riscv/lib/
 122 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 123
 124 PHONY += vdso_install
 125 vdso_install:
 126         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 127         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 128                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 129
 130 ifeq ($(KBUILD_EXTMOD),)
 131 ifeq ($(CONFIG_MMU),y)
 132 prepare: vdso_prepare
 133 vdso_prepare: prepare0
 134         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 135         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 136                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 137
 138 endif
 139 endif
 140
 141 ifneq ($(CONFIG_XIP_KERNEL),y)
 142 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
 143 KBUILD_IMAGE := $(boot)/loader.bin
 144 else
 145 ifeq ($(CONFIG_EFI_ZBOOT),)
 146 KBUILD_IMAGE := $(boot)/Image.gz
 147 else
 148 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 149 endif
 150 endif
 151 endif
 152 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 153
 154 all:    $(notdir $(KBUILD_IMAGE))
 155
 156 $(BOOT_TARGETS): vmlinux
 157         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 158         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 159
 160 Image.%: Image
 161         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 162
 163 install: KBUILD_IMAGE := $(boot)/Image
 164 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 165 install zinstall:
 166         $(call cmd,install)
 167
 168 PHONY += rv32_randconfig
 169 rv32_randconfig:
 170         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 171                 -f $(srctree)/Makefile randconfig
 172
 173 PHONY += rv64_randconfig
 174 rv64_randconfig:
 175         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 176                 -f $(srctree)/Makefile randconfig
 177
 178 PHONY += rv32_defconfig
 179 rv32_defconfig:
 180         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
 181
 182 PHONY += rv32_nommu_virt_defconfig
 183 rv32_nommu_virt_defconfig:
 184         $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config