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 ($(CONFIG_ARCH_RV64I),y)
  30         BITS := 64
  31         UTS_MACHINE := riscv64
  32
  33         KBUILD_CFLAGS += -mabi=lp64
  34         KBUILD_AFLAGS += -mabi=lp64
  35
  36         KBUILD_LDFLAGS += -melf64lriscv
  37 else
  38         BITS := 32
  39         UTS_MACHINE := riscv32
  40
  41         KBUILD_CFLAGS += -mabi=ilp32
  42         KBUILD_AFLAGS += -mabi=ilp32
  43         KBUILD_LDFLAGS += -melf32lriscv
  44 endif
  45
  46 ifndef CONFIG_RISCV_USE_LINKER_RELAXATION
  47         KBUILD_CFLAGS += -mno-relax
  48         KBUILD_AFLAGS += -mno-relax
  49 ifndef CONFIG_AS_IS_LLVM
  50         KBUILD_CFLAGS += -Wa,-mno-relax
  51         KBUILD_AFLAGS += -Wa,-mno-relax
  52 endif
  53 # LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350
  54 # Ensure it is aware of linker relaxation with LTO, otherwise relocations may
  55 # be incorrect: https://github.com/llvm/llvm-project/issues/65090
  56 else ifeq ($(CONFIG_LTO_CLANG),y)
  57         KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax
  58 endif
  59
  60 ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
  61         KBUILD_LDFLAGS += --no-relax-gp
  62 endif
  63
  64 # ISA string setting
  65 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  66 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  67 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  68 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  69 riscv-march-$(CONFIG_RISCV_ISA_V)       := $(riscv-march-y)v
  70
  71 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  72 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  73 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  74 else
  75 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  76 endif
  77
  78 # Check if the toolchain supports Zihintpause extension
  79 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  80
  81 # Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
  82 # matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
  83 KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
  84
  85 KBUILD_AFLAGS += -march=$(riscv-march-y)
  86
  87 KBUILD_CFLAGS += -mno-save-restore
  88 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  89
  90 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  91         KBUILD_CFLAGS += -mcmodel=medlow
  92 endif
  93 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  94         KBUILD_CFLAGS += -mcmodel=medany
  95 endif
  96
  97 # Avoid generating .eh_frame sections.
  98 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  99
 100 # The RISC-V attributes frequently cause compatibility issues and provide no
 101 # information, so just turn them off.
 102 KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
 103 KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
 104 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 105 KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 106
 107 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 108 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 109
 110 # GCC versions that support the "-mstrict-align" option default to allowing
 111 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
 112 # RISC-V ISA, they're emulated by machine mode traps on all extant
 113 # architectures.  It's faster to have GCC emit only aligned accesses.
 114 ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y)
 115 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 116 endif
 117
 118 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 119 prepare: stack_protector_prepare
 120 stack_protector_prepare: prepare0
 121         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 122                                 -mstack-protector-guard-reg=tp            \
 123                                 -mstack-protector-guard-offset=$(shell    \
 124                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 125                                         include/generated/asm-offsets.h))
 126 endif
 127
 128 # arch specific predefines for sparse
 129 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 130
 131 # Default target when executing plain make
 132 boot            := arch/riscv/boot
 133 ifeq ($(CONFIG_XIP_KERNEL),y)
 134 KBUILD_IMAGE := $(boot)/xipImage
 135 else
 136 KBUILD_IMAGE    := $(boot)/Image.gz
 137 endif
 138
 139 libs-y += arch/riscv/lib/
 140 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 141
 142 ifeq ($(KBUILD_EXTMOD),)
 143 ifeq ($(CONFIG_MMU),y)
 144 prepare: vdso_prepare
 145 vdso_prepare: prepare0
 146         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 147         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 148                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 149
 150 endif
 151 endif
 152
 153 vdso-install-y                  += arch/riscv/kernel/vdso/vdso.so.dbg
 154 vdso-install-$(CONFIG_COMPAT)   += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg
 155
 156 ifneq ($(CONFIG_XIP_KERNEL),y)
 157 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
 158 KBUILD_IMAGE := $(boot)/loader.bin
 159 else
 160 ifeq ($(CONFIG_EFI_ZBOOT),)
 161 KBUILD_IMAGE := $(boot)/Image.gz
 162 else
 163 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 164 endif
 165 endif
 166 endif
 167 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 168
 169 all:    $(notdir $(KBUILD_IMAGE))
 170
 171 loader.bin: loader
 172 Image.gz loader vmlinuz.efi: Image
 173 $(BOOT_TARGETS): vmlinux
 174         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 175         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 176
 177 Image.%: Image
 178         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 179
 180 install: KBUILD_IMAGE := $(boot)/Image
 181 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 182 install zinstall:
 183         $(call cmd,install)
 184
 185 PHONY += rv32_randconfig
 186 rv32_randconfig:
 187         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 188                 -f $(srctree)/Makefile randconfig
 189
 190 PHONY += rv64_randconfig
 191 rv64_randconfig:
 192         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 193                 -f $(srctree)/Makefile randconfig
 194
 195 PHONY += rv32_defconfig
 196 rv32_defconfig:
 197         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
 198
 199 PHONY += rv32_nommu_virt_defconfig
 200 rv32_nommu_virt_defconfig:
 201         $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config