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, $(CONFIG_LLD_VERSION), 150000),y)
  49         KBUILD_CFLAGS += -mno-relax
  50         KBUILD_AFLAGS += -mno-relax
  51 ifndef CONFIG_AS_IS_LLVM
  52         KBUILD_CFLAGS += -Wa,-mno-relax
  53         KBUILD_AFLAGS += -Wa,-mno-relax
  54 endif
  55 endif
  56 endif
  57
  58 ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
  59         KBUILD_LDFLAGS += --no-relax-gp
  60 endif
  61
  62 # ISA string setting
  63 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  64 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  65 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  66 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  67 riscv-march-$(CONFIG_RISCV_ISA_V)       := $(riscv-march-y)v
  68
  69 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  70 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  71 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  72 else
  73 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  74 endif
  75
  76 # Check if the toolchain supports Zihintpause extension
  77 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  78
  79 # Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
  80 # matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
  81 KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
  82
  83 KBUILD_AFLAGS += -march=$(riscv-march-y)
  84
  85 KBUILD_CFLAGS += -mno-save-restore
  86 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  87
  88 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  89         KBUILD_CFLAGS += -mcmodel=medlow
  90 endif
  91 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  92         KBUILD_CFLAGS += -mcmodel=medany
  93 endif
  94
  95 # Avoid generating .eh_frame sections.
  96 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  97
  98 # The RISC-V attributes frequently cause compatibility issues and provide no
  99 # information, so just turn them off.
 100 KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
 101 KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
 102 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 103 KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 104
 105 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 106 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 107
 108 # GCC versions that support the "-mstrict-align" option default to allowing
 109 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
 110 # RISC-V ISA, they're emulated by machine mode traps on all extant
 111 # architectures.  It's faster to have GCC emit only aligned accesses.
 112 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 113
 114 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 115 prepare: stack_protector_prepare
 116 stack_protector_prepare: prepare0
 117         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 118                                 -mstack-protector-guard-reg=tp            \
 119                                 -mstack-protector-guard-offset=$(shell    \
 120                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 121                                         include/generated/asm-offsets.h))
 122 endif
 123
 124 # arch specific predefines for sparse
 125 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 126
 127 # Default target when executing plain make
 128 boot            := arch/riscv/boot
 129 ifeq ($(CONFIG_XIP_KERNEL),y)
 130 KBUILD_IMAGE := $(boot)/xipImage
 131 else
 132 KBUILD_IMAGE    := $(boot)/Image.gz
 133 endif
 134
 135 libs-y += arch/riscv/lib/
 136 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 137
 138 PHONY += vdso_install
 139 vdso_install:
 140         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 141         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 142                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 143
 144 ifeq ($(KBUILD_EXTMOD),)
 145 ifeq ($(CONFIG_MMU),y)
 146 prepare: vdso_prepare
 147 vdso_prepare: prepare0
 148         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 149         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 150                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 151
 152 endif
 153 endif
 154
 155 ifneq ($(CONFIG_XIP_KERNEL),y)
 156 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
 157 KBUILD_IMAGE := $(boot)/loader.bin
 158 else
 159 ifeq ($(CONFIG_EFI_ZBOOT),)
 160 KBUILD_IMAGE := $(boot)/Image.gz
 161 else
 162 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 163 endif
 164 endif
 165 endif
 166 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 167
 168 all:    $(notdir $(KBUILD_IMAGE))
 169
 170 $(BOOT_TARGETS): vmlinux
 171         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 172         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 173
 174 Image.%: Image
 175         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 176
 177 install: KBUILD_IMAGE := $(boot)/Image
 178 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 179 install zinstall:
 180         $(call cmd,install)
 181
 182 PHONY += rv32_randconfig
 183 rv32_randconfig:
 184         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 185                 -f $(srctree)/Makefile randconfig
 186
 187 PHONY += rv64_randconfig
 188 rv64_randconfig:
 189         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 190                 -f $(srctree)/Makefile randconfig
 191
 192 PHONY += rv32_defconfig
 193 rv32_defconfig:
 194         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
 195
 196 PHONY += rv32_nommu_virt_defconfig
 197 rv32_nommu_virt_defconfig:
 198         $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config