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