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 LDFLAGS_vmlinux := -z norelro
  10 ifeq ($(CONFIG_RELOCATABLE),y)
  11         LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs
  12         KBUILD_CFLAGS += -fPIE
  13 endif
  14 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  15         LDFLAGS_vmlinux += --no-relax
  16         KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  17 ifeq ($(CONFIG_RISCV_ISA_C),y)
  18         CC_FLAGS_FTRACE := -fpatchable-function-entry=4
  19 else
  20         CC_FLAGS_FTRACE := -fpatchable-function-entry=2
  21 endif
  22 endif
  23
  24 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  25 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  26 endif
  27
  28 export BITS
  29 ifeq ($(CONFIG_ARCH_RV64I),y)
  30         BITS := 64
  31         UTS_MACHINE := riscv64
  32
  33         KBUILD_CFLAGS += -mabi=lp64
  34         KBUILD_AFLAGS += -mabi=lp64
  35
  36         KBUILD_LDFLAGS += -melf64lriscv
  37
  38         KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 --target=riscv64imac-unknown-none-elf \
  39                             -Cno-redzone
  40 else
  41         BITS := 32
  42         UTS_MACHINE := riscv32
  43
  44         KBUILD_CFLAGS += -mabi=ilp32
  45         KBUILD_AFLAGS += -mabi=ilp32
  46         KBUILD_LDFLAGS += -melf32lriscv
  47 endif
  48
  49 ifndef CONFIG_RISCV_USE_LINKER_RELAXATION
  50         KBUILD_CFLAGS += -mno-relax
  51         KBUILD_AFLAGS += -mno-relax
  52 ifndef CONFIG_AS_IS_LLVM
  53         KBUILD_CFLAGS += -Wa,-mno-relax
  54         KBUILD_AFLAGS += -Wa,-mno-relax
  55 endif
  56 # LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350
  57 # Ensure it is aware of linker relaxation with LTO, otherwise relocations may
  58 # be incorrect: https://github.com/llvm/llvm-project/issues/65090
  59 else ifeq ($(CONFIG_LTO_CLANG),y)
  60         KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax
  61 endif
  62
  63 ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
  64         KBUILD_LDFLAGS += --no-relax-gp
  65 endif
  66
  67 # ISA string setting
  68 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  69 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  70 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  71 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  72 riscv-march-$(CONFIG_RISCV_ISA_V)       := $(riscv-march-y)v
  73
  74 ifneq ($(CONFIG_RISCV_ISA_C),y)
  75         KBUILD_RUSTFLAGS += -Ctarget-feature=-c
  76 endif
  77
  78 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  79 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  80 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  81 else
  82 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  83 endif
  84
  85 # Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
  86 # matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
  87 KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
  88
  89 KBUILD_AFLAGS += -march=$(riscv-march-y)
  90
  91 # For C code built with floating-point support, exclude V but keep F and D.
  92 CC_FLAGS_FPU  := -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)([^v_]*)v?/\1\2/')
  93
  94 KBUILD_CFLAGS += -mno-save-restore
  95 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  96
  97 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  98         KBUILD_CFLAGS += -mcmodel=medlow
  99 endif
 100 ifeq ($(CONFIG_CMODEL_MEDANY),y)
 101         KBUILD_CFLAGS += -mcmodel=medany
 102 endif
 103
 104 # Avoid generating .eh_frame sections.
 105 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
 106
 107 # The RISC-V attributes frequently cause compatibility issues and provide no
 108 # information, so just turn them off.
 109 KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
 110 KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
 111 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 112 KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 113
 114 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 115 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 116
 117 # GCC versions that support the "-mstrict-align" option default to allowing
 118 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
 119 # RISC-V ISA, they're emulated by machine mode traps on all extant
 120 # architectures.  It's faster to have GCC emit only aligned accesses.
 121 ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y)
 122 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 123 endif
 124
 125 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 126 prepare: stack_protector_prepare
 127 stack_protector_prepare: prepare0
 128         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 129                                 -mstack-protector-guard-reg=tp            \
 130                                 -mstack-protector-guard-offset=$(shell    \
 131                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 132                                         include/generated/asm-offsets.h))
 133 endif
 134
 135 # arch specific predefines for sparse
 136 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 137
 138 # Default target when executing plain make
 139 boot            := arch/riscv/boot
 140 ifeq ($(CONFIG_XIP_KERNEL),y)
 141 KBUILD_IMAGE := $(boot)/xipImage
 142 else
 143 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN_K210),yy)
 144 KBUILD_IMAGE := $(boot)/loader.bin
 145 else
 146 ifeq ($(CONFIG_EFI_ZBOOT),)
 147 KBUILD_IMAGE    := $(boot)/Image.gz
 148 else
 149 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 150 endif
 151 endif
 152 endif
 153
 154 boot                                    := arch/riscv/boot
 155 boot-image-y                            := Image
 156 boot-image-$(CONFIG_KERNEL_BZIP2)       := Image.bz2
 157 boot-image-$(CONFIG_KERNEL_GZIP)        := Image.gz
 158 boot-image-$(CONFIG_KERNEL_LZ4)         := Image.lz4
 159 boot-image-$(CONFIG_KERNEL_LZMA)        := Image.lzma
 160 boot-image-$(CONFIG_KERNEL_LZO)         := Image.lzo
 161 boot-image-$(CONFIG_KERNEL_ZSTD)        := Image.zst
 162 ifdef CONFIG_RISCV_M_MODE
 163 boot-image-$(CONFIG_ARCH_CANAAN)        := loader.bin
 164 endif
 165 boot-image-$(CONFIG_EFI_ZBOOT)          := vmlinuz.efi
 166 boot-image-$(CONFIG_XIP_KERNEL)         := xipImage
 167 KBUILD_IMAGE                            := $(boot)/$(boot-image-y)
 168
 169 libs-y += arch/riscv/lib/
 170 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 171
 172 ifeq ($(KBUILD_EXTMOD),)
 173 ifeq ($(CONFIG_MMU),y)
 174 prepare: vdso_prepare
 175 vdso_prepare: prepare0
 176         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 177         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 178                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 179
 180 endif
 181 endif
 182
 183 vdso-install-y                  += arch/riscv/kernel/vdso/vdso.so.dbg
 184 vdso-install-$(CONFIG_COMPAT)   += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg
 185
 186 BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst loader loader.bin xipImage vmlinuz.efi
 187
 188 all:    $(notdir $(KBUILD_IMAGE))
 189
 190 loader.bin: loader
 191 Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst loader xipImage vmlinuz.efi: Image
 192
 193 $(BOOT_TARGETS): vmlinux
 194         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 195         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 196
 197 # the install target always installs KBUILD_IMAGE (which may be compressed)
 198 # but keep the zinstall target for compatibility with older releases
 199 install zinstall:
 200         $(call cmd,install)
 201
 202 PHONY += rv32_randconfig
 203 rv32_randconfig:
 204         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 205                 -f $(srctree)/Makefile randconfig
 206
 207 PHONY += rv64_randconfig
 208 rv64_randconfig:
 209         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 210                 -f $(srctree)/Makefile randconfig
 211
 212 PHONY += rv32_defconfig
 213 rv32_defconfig:
 214         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
 215
 216 PHONY += rv32_nommu_virt_defconfig
 217 rv32_nommu_virt_defconfig:
 218         $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config
 219
 220 define archhelp
 221   echo  '  Image                - Uncompressed kernel image (arch/riscv/boot/Image)'
 222   echo  '  Image.gz     - Compressed kernel image (arch/riscv/boot/Image.gz)'
 223   echo  '  Image.bz2    - Compressed kernel image (arch/riscv/boot/Image.bz2)'
 224   echo  '  Image.lz4    - Compressed kernel image (arch/riscv/boot/Image.lz4)'
 225   echo  '  Image.lzma   - Compressed kernel image (arch/riscv/boot/Image.lzma)'
 226   echo  '  Image.lzo    - Compressed kernel image (arch/riscv/boot/Image.lzo)'
 227   echo  '  Image.zst    - Compressed kernel image (arch/riscv/boot/Image.zst)'
 228   echo  '  vmlinuz.efi  - Compressed EFI kernel image (arch/riscv/boot/vmlinuz.efi)'
 229   echo  '                 Default when CONFIG_EFI_ZBOOT=y'
 230   echo  '  xipImage     - Execute-in-place kernel image (arch/riscv/boot/xipImage)'
 231   echo  '                 Default when CONFIG_XIP_KERNEL=y'
 232   echo  '  install      - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
 233   echo  '                 (distribution) /sbin/$(INSTALLKERNEL) or install to '
 234   echo  '                 $$(INSTALL_PATH)'
 235 endef