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 ($(CONFIG_LD_IS_LLD),y)
  44 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
  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 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  61 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  62 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  63 else
  64 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  65 endif
  66
  67 # Check if the toolchain supports Zicbom extension
  68 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZICBOM) := $(riscv-march-y)_zicbom
  69
  70 # Check if the toolchain supports Zihintpause extension
  71 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  72
  73 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  74 KBUILD_AFLAGS += -march=$(riscv-march-y)
  75
  76 KBUILD_CFLAGS += -mno-save-restore
  77 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  78
  79 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  80         KBUILD_CFLAGS += -mcmodel=medlow
  81 endif
  82 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  83         KBUILD_CFLAGS += -mcmodel=medany
  84 endif
  85 ifeq ($(CONFIG_PERF_EVENTS),y)
  86         KBUILD_CFLAGS += -fno-omit-frame-pointer
  87 endif
  88
  89 # Avoid generating .eh_frame sections.
  90 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  91
  92 # The RISC-V attributes frequently cause compatibility issues and provide no
  93 # information, so just turn them off.
  94 KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
  95 KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
  96 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
  97 KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
  98
  99 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 100 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 101
 102 # GCC versions that support the "-mstrict-align" option default to allowing
 103 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
 104 # RISC-V ISA, they're emulated by machine mode traps on all extant
 105 # architectures.  It's faster to have GCC emit only aligned accesses.
 106 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 107
 108 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 109 prepare: stack_protector_prepare
 110 stack_protector_prepare: prepare0
 111         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 112                                 -mstack-protector-guard-reg=tp            \
 113                                 -mstack-protector-guard-offset=$(shell    \
 114                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 115                                         include/generated/asm-offsets.h))
 116 endif
 117
 118 # arch specific predefines for sparse
 119 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 120
 121 # Default target when executing plain make
 122 boot            := arch/riscv/boot
 123 ifeq ($(CONFIG_XIP_KERNEL),y)
 124 KBUILD_IMAGE := $(boot)/xipImage
 125 else
 126 KBUILD_IMAGE    := $(boot)/Image.gz
 127 endif
 128
 129 libs-y += arch/riscv/lib/
 130 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 131
 132 PHONY += vdso_install
 133 vdso_install:
 134         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 135         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 136                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 137
 138 ifeq ($(KBUILD_EXTMOD),)
 139 ifeq ($(CONFIG_MMU),y)
 140 prepare: vdso_prepare
 141 vdso_prepare: prepare0
 142         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 143         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 144                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 145
 146 endif
 147 endif
 148
 149 ifneq ($(CONFIG_XIP_KERNEL),y)
 150 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 151 KBUILD_IMAGE := $(boot)/loader.bin
 152 else
 153 ifeq ($(CONFIG_EFI_ZBOOT),)
 154 KBUILD_IMAGE := $(boot)/Image.gz
 155 else
 156 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 157 endif
 158 endif
 159 endif
 160 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 161
 162 all:    $(notdir $(KBUILD_IMAGE))
 163
 164 $(BOOT_TARGETS): vmlinux
 165         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 166         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 167
 168 Image.%: Image
 169         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 170
 171 install: KBUILD_IMAGE := $(boot)/Image
 172 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 173 install zinstall:
 174         $(call cmd,install)
 175
 176 PHONY += rv32_randconfig
 177 rv32_randconfig:
 178         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 179                 -f $(srctree)/Makefile randconfig
 180
 181 PHONY += rv64_randconfig
 182 rv64_randconfig:
 183         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 184                 -f $(srctree)/Makefile randconfig
 185
 186 PHONY += rv32_defconfig
 187 rv32_defconfig:
 188         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config