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 ($(CONFIG_DYNAMIC_FTRACE),y)
  12         LDFLAGS_vmlinux := --no-relax
  13         KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  14         CC_FLAGS_FTRACE := -fpatchable-function-entry=8
  15 endif
  16
  17 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  18 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  19 endif
  20
  21 export BITS
  22 ifeq ($(CONFIG_ARCH_RV64I),y)
  23         BITS := 64
  24         UTS_MACHINE := riscv64
  25
  26         KBUILD_CFLAGS += -mabi=lp64
  27         KBUILD_AFLAGS += -mabi=lp64
  28
  29         KBUILD_LDFLAGS += -melf64lriscv
  30 else
  31         BITS := 32
  32         UTS_MACHINE := riscv32
  33
  34         KBUILD_CFLAGS += -mabi=ilp32
  35         KBUILD_AFLAGS += -mabi=ilp32
  36         KBUILD_LDFLAGS += -melf32lriscv
  37 endif
  38
  39 ifeq ($(CONFIG_LD_IS_LLD),y)
  40         KBUILD_CFLAGS += -mno-relax
  41         KBUILD_AFLAGS += -mno-relax
  42 ifndef CONFIG_AS_IS_LLVM
  43         KBUILD_CFLAGS += -Wa,-mno-relax
  44         KBUILD_AFLAGS += -Wa,-mno-relax
  45 endif
  46 endif
  47
  48 # ISA string setting
  49 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  50 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  51 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  52 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  53
  54 # Newer binutils versions default to ISA spec version 20191213 which moves some
  55 # instructions from the I extension to the Zicsr and Zifencei extensions.
  56 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
  57 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
  58
  59 # Check if the toolchain supports Zicbom extension
  60 toolchain-supports-zicbom := $(call cc-option-yn, -march=$(riscv-march-y)_zicbom)
  61 riscv-march-$(toolchain-supports-zicbom) := $(riscv-march-y)_zicbom
  62
  63 # Check if the toolchain supports Zihintpause extension
  64 toolchain-supports-zihintpause := $(call cc-option-yn, -march=$(riscv-march-y)_zihintpause)
  65 riscv-march-$(toolchain-supports-zihintpause) := $(riscv-march-y)_zihintpause
  66
  67 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  68 KBUILD_AFLAGS += -march=$(riscv-march-y)
  69
  70 KBUILD_CFLAGS += -mno-save-restore
  71 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  72
  73 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  74         KBUILD_CFLAGS += -mcmodel=medlow
  75 endif
  76 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  77         KBUILD_CFLAGS += -mcmodel=medany
  78 endif
  79 ifeq ($(CONFIG_PERF_EVENTS),y)
  80         KBUILD_CFLAGS += -fno-omit-frame-pointer
  81 endif
  82
  83 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  84 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  85
  86 # GCC versions that support the "-mstrict-align" option default to allowing
  87 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  88 # RISC-V ISA, they're emulated by machine mode traps on all extant
  89 # architectures.  It's faster to have GCC emit only aligned accesses.
  90 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  91
  92 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  93 prepare: stack_protector_prepare
  94 stack_protector_prepare: prepare0
  95         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  96                                 -mstack-protector-guard-reg=tp            \
  97                                 -mstack-protector-guard-offset=$(shell    \
  98                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  99                                         include/generated/asm-offsets.h))
 100 endif
 101
 102 # arch specific predefines for sparse
 103 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 104
 105 # Default target when executing plain make
 106 boot            := arch/riscv/boot
 107 ifeq ($(CONFIG_XIP_KERNEL),y)
 108 KBUILD_IMAGE := $(boot)/xipImage
 109 else
 110 KBUILD_IMAGE    := $(boot)/Image.gz
 111 endif
 112
 113 head-y := arch/riscv/kernel/head.o
 114
 115 libs-y += arch/riscv/lib/
 116 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 117
 118 PHONY += vdso_install
 119 vdso_install:
 120         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 121         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 122                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 123
 124 ifeq ($(KBUILD_EXTMOD),)
 125 ifeq ($(CONFIG_MMU),y)
 126 prepare: vdso_prepare
 127 vdso_prepare: prepare0
 128         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 129         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 130                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 131
 132 endif
 133 endif
 134
 135 ifneq ($(CONFIG_XIP_KERNEL),y)
 136 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 137 KBUILD_IMAGE := $(boot)/loader.bin
 138 else
 139 KBUILD_IMAGE := $(boot)/Image.gz
 140 endif
 141 endif
 142 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 143
 144 all:    $(notdir $(KBUILD_IMAGE))
 145
 146 $(BOOT_TARGETS): vmlinux
 147         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 148         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 149
 150 Image.%: Image
 151         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 152
 153 install: KBUILD_IMAGE := $(boot)/Image
 154 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 155 install zinstall:
 156         $(call cmd,install)
 157
 158 PHONY += rv32_randconfig
 159 rv32_randconfig:
 160         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 161                 -f $(srctree)/Makefile randconfig
 162
 163 PHONY += rv64_randconfig
 164 rv64_randconfig:
 165         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 166                 -f $(srctree)/Makefile randconfig
 167
 168 PHONY += rv32_defconfig
 169 rv32_defconfig:
 170         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config