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) := $(riscv-march-y)_zicsr_zifencei
  58
  59 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  60 KBUILD_AFLAGS += -march=$(riscv-march-y)
  61
  62 KBUILD_CFLAGS += -mno-save-restore
  63 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  64
  65 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  66         KBUILD_CFLAGS += -mcmodel=medlow
  67 endif
  68 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  69         KBUILD_CFLAGS += -mcmodel=medany
  70 endif
  71 ifeq ($(CONFIG_PERF_EVENTS),y)
  72         KBUILD_CFLAGS += -fno-omit-frame-pointer
  73 endif
  74
  75 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  76 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  77
  78 # GCC versions that support the "-mstrict-align" option default to allowing
  79 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  80 # RISC-V ISA, they're emulated by machine mode traps on all extant
  81 # architectures.  It's faster to have GCC emit only aligned accesses.
  82 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  83
  84 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  85 prepare: stack_protector_prepare
  86 stack_protector_prepare: prepare0
  87         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  88                                 -mstack-protector-guard-reg=tp            \
  89                                 -mstack-protector-guard-offset=$(shell    \
  90                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  91                                         include/generated/asm-offsets.h))
  92 endif
  93
  94 # arch specific predefines for sparse
  95 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  96
  97 # Default target when executing plain make
  98 boot            := arch/riscv/boot
  99 ifeq ($(CONFIG_XIP_KERNEL),y)
 100 KBUILD_IMAGE := $(boot)/xipImage
 101 else
 102 KBUILD_IMAGE    := $(boot)/Image.gz
 103 endif
 104
 105 head-y := arch/riscv/kernel/head.o
 106
 107 libs-y += arch/riscv/lib/
 108 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 109
 110 PHONY += vdso_install
 111 vdso_install:
 112         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 113         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 114                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 115
 116 ifeq ($(KBUILD_EXTMOD),)
 117 ifeq ($(CONFIG_MMU),y)
 118 prepare: vdso_prepare
 119 vdso_prepare: prepare0
 120         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 121         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 122                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 123
 124 endif
 125 endif
 126
 127 ifneq ($(CONFIG_XIP_KERNEL),y)
 128 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 129 KBUILD_IMAGE := $(boot)/loader.bin
 130 else
 131 KBUILD_IMAGE := $(boot)/Image.gz
 132 endif
 133 endif
 134 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 135
 136 all:    $(notdir $(KBUILD_IMAGE))
 137
 138 $(BOOT_TARGETS): vmlinux
 139         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 140         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 141
 142 Image.%: Image
 143         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 144
 145 install: KBUILD_IMAGE := $(boot)/Image
 146 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 147 install zinstall:
 148         $(call cmd,install)
 149
 150 PHONY += rv32_randconfig
 151 rv32_randconfig:
 152         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 153                 -f $(srctree)/Makefile randconfig
 154
 155 PHONY += rv64_randconfig
 156 rv64_randconfig:
 157         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 158                 -f $(srctree)/Makefile randconfig
 159
 160 PHONY += rv32_defconfig
 161 rv32_defconfig:
 162         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config