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)       := $(riscv-march-y)c
  63 riscv-march-$(CONFIG_RISCV_ISA_V)       := $(riscv-march-y)v
  64
  65 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  66 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  67 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  68 else
  69 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  70 endif
  71
  72 # Check if the toolchain supports Zihintpause extension
  73 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  74
  75 # Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
  76 # matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
  77 KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
  78
  79 KBUILD_AFLAGS += -march=$(riscv-march-y)
  80
  81 KBUILD_CFLAGS += -mno-save-restore
  82 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  83
  84 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  85         KBUILD_CFLAGS += -mcmodel=medlow
  86 endif
  87 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  88         KBUILD_CFLAGS += -mcmodel=medany
  89 endif
  90
  91 # Avoid generating .eh_frame sections.
  92 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  93
  94 # The RISC-V attributes frequently cause compatibility issues and provide no
  95 # information, so just turn them off.
  96 KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
  97 KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
  98 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
  99 KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 100
 101 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 102 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 103
 104 # GCC versions that support the "-mstrict-align" option default to allowing
 105 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
 106 # RISC-V ISA, they're emulated by machine mode traps on all extant
 107 # architectures.  It's faster to have GCC emit only aligned accesses.
 108 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 109
 110 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 111 prepare: stack_protector_prepare
 112 stack_protector_prepare: prepare0
 113         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 114                                 -mstack-protector-guard-reg=tp            \
 115                                 -mstack-protector-guard-offset=$(shell    \
 116                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 117                                         include/generated/asm-offsets.h))
 118 endif
 119
 120 # arch specific predefines for sparse
 121 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 122
 123 # Default target when executing plain make
 124 boot            := arch/riscv/boot
 125 ifeq ($(CONFIG_XIP_KERNEL),y)
 126 KBUILD_IMAGE := $(boot)/xipImage
 127 else
 128 KBUILD_IMAGE    := $(boot)/Image.gz
 129 endif
 130
 131 libs-y += arch/riscv/lib/
 132 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 133
 134 PHONY += vdso_install
 135 vdso_install:
 136         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 137         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 138                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 139
 140 ifeq ($(KBUILD_EXTMOD),)
 141 ifeq ($(CONFIG_MMU),y)
 142 prepare: vdso_prepare
 143 vdso_prepare: prepare0
 144         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 145         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 146                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 147
 148 endif
 149 endif
 150
 151 ifneq ($(CONFIG_XIP_KERNEL),y)
 152 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
 153 KBUILD_IMAGE := $(boot)/loader.bin
 154 else
 155 ifeq ($(CONFIG_EFI_ZBOOT),)
 156 KBUILD_IMAGE := $(boot)/Image.gz
 157 else
 158 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 159 endif
 160 endif
 161 endif
 162 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 163
 164 all:    $(notdir $(KBUILD_IMAGE))
 165
 166 $(BOOT_TARGETS): vmlinux
 167         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 168         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 169
 170 Image.%: Image
 171         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 172
 173 install: KBUILD_IMAGE := $(boot)/Image
 174 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 175 install zinstall:
 176         $(call cmd,install)
 177
 178 PHONY += rv32_randconfig
 179 rv32_randconfig:
 180         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 181                 -f $(srctree)/Makefile randconfig
 182
 183 PHONY += rv64_randconfig
 184 rv64_randconfig:
 185         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 186                 -f $(srctree)/Makefile randconfig
 187
 188 PHONY += rv32_defconfig
 189 rv32_defconfig:
 190         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
 191
 192 PHONY += rv32_nommu_virt_defconfig
 193 rv32_nommu_virt_defconfig:
 194         $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config