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