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 ($(CONFIG_ARCH_RV64I),y)
  30         BITS := 64
  31         UTS_MACHINE := riscv64
  32
  33         KBUILD_CFLAGS += -mabi=lp64
  34         KBUILD_AFLAGS += -mabi=lp64
  35
  36         KBUILD_LDFLAGS += -melf64lriscv
  37 else
  38         BITS := 32
  39         UTS_MACHINE := riscv32
  40
  41         KBUILD_CFLAGS += -mabi=ilp32
  42         KBUILD_AFLAGS += -mabi=ilp32
  43         KBUILD_LDFLAGS += -melf32lriscv
  44 endif
  45
  46 ifeq ($(CONFIG_LD_IS_LLD),y)
  47 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y)
  48         KBUILD_CFLAGS += -mno-relax
  49         KBUILD_AFLAGS += -mno-relax
  50 ifndef CONFIG_AS_IS_LLVM
  51         KBUILD_CFLAGS += -Wa,-mno-relax
  52         KBUILD_AFLAGS += -Wa,-mno-relax
  53 endif
  54 endif
  55 endif
  56
  57 ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
  58         KBUILD_LDFLAGS += --no-relax-gp
  59 endif
  60
  61 # ISA string setting
  62 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  63 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  64 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  65 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  66 riscv-march-$(CONFIG_RISCV_ISA_V)       := $(riscv-march-y)v
  67
  68 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  69 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  70 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  71 else
  72 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  73 endif
  74
  75 # Check if the toolchain supports Zihintpause extension
  76 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  77
  78 # Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
  79 # matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
  80 KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
  81
  82 KBUILD_AFLAGS += -march=$(riscv-march-y)
  83
  84 KBUILD_CFLAGS += -mno-save-restore
  85 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  86
  87 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  88         KBUILD_CFLAGS += -mcmodel=medlow
  89 endif
  90 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  91         KBUILD_CFLAGS += -mcmodel=medany
  92 endif
  93
  94 # Avoid generating .eh_frame sections.
  95 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  96
  97 # The RISC-V attributes frequently cause compatibility issues and provide no
  98 # information, so just turn them off.
  99 KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
 100 KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
 101 KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 102 KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
 103
 104 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 105 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
 106
 107 # GCC versions that support the "-mstrict-align" option default to allowing
 108 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
 109 # RISC-V ISA, they're emulated by machine mode traps on all extant
 110 # architectures.  It's faster to have GCC emit only aligned accesses.
 111 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
 112
 113 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 114 prepare: stack_protector_prepare
 115 stack_protector_prepare: prepare0
 116         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 117                                 -mstack-protector-guard-reg=tp            \
 118                                 -mstack-protector-guard-offset=$(shell    \
 119                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 120                                         include/generated/asm-offsets.h))
 121 endif
 122
 123 # arch specific predefines for sparse
 124 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 125
 126 # Default target when executing plain make
 127 boot            := arch/riscv/boot
 128 ifeq ($(CONFIG_XIP_KERNEL),y)
 129 KBUILD_IMAGE := $(boot)/xipImage
 130 else
 131 KBUILD_IMAGE    := $(boot)/Image.gz
 132 endif
 133
 134 libs-y += arch/riscv/lib/
 135 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 136
 137 ifeq ($(KBUILD_EXTMOD),)
 138 ifeq ($(CONFIG_MMU),y)
 139 prepare: vdso_prepare
 140 vdso_prepare: prepare0
 141         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 142         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 143                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 144
 145 endif
 146 endif
 147
 148 vdso-install-y                  += arch/riscv/kernel/vdso/vdso.so.dbg
 149 vdso-install-$(CONFIG_COMPAT)   += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so
 150
 151 ifneq ($(CONFIG_XIP_KERNEL),y)
 152 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
 153 KBUILD_IMAGE := $(boot)/loader.bin
 154 else
 155 ifeq ($(CONFIG_EFI_ZBOOT),)
 156 KBUILD_IMAGE := $(boot)/Image.gz
 157 else
 158 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 159 endif
 160 endif
 161 endif
 162 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 163
 164 all:    $(notdir $(KBUILD_IMAGE))
 165
 166 $(BOOT_TARGETS): vmlinux
 167         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 168         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 169
 170 Image.%: Image
 171         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 172
 173 install: KBUILD_IMAGE := $(boot)/Image
 174 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 175 install zinstall:
 176         $(call cmd,install)
 177
 178 PHONY += rv32_randconfig
 179 rv32_randconfig:
 180         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 181                 -f $(srctree)/Makefile randconfig
 182
 183 PHONY += rv64_randconfig
 184 rv64_randconfig:
 185         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 186                 -f $(srctree)/Makefile randconfig
 187
 188 PHONY += rv32_defconfig
 189 rv32_defconfig:
 190         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
 191
 192 PHONY += rv32_nommu_virt_defconfig
 193 rv32_nommu_virt_defconfig:
 194         $(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config