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 ($(CONFIG_LD_IS_LLD),y)
  44 ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y)
  45         KBUILD_CFLAGS += -mno-relax
  46         KBUILD_AFLAGS += -mno-relax
  47 ifndef CONFIG_AS_IS_LLVM
  48         KBUILD_CFLAGS += -Wa,-mno-relax
  49         KBUILD_AFLAGS += -Wa,-mno-relax
  50 endif
  51 endif
  52 endif
  53
  54 # ISA string setting
  55 riscv-march-$(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 # Newer binutils versions default to ISA spec version 20191213 which moves some
  61 # instructions from the I extension to the Zicsr and Zifencei extensions.
  62 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
  63 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
  64
  65 # Check if the toolchain supports Zihintpause extension
  66 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
  67
  68 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  69 KBUILD_AFLAGS += -march=$(riscv-march-y)
  70
  71 KBUILD_CFLAGS += -mno-save-restore
  72 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  73
  74 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  75         KBUILD_CFLAGS += -mcmodel=medlow
  76 endif
  77 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  78         KBUILD_CFLAGS += -mcmodel=medany
  79 endif
  80 ifeq ($(CONFIG_PERF_EVENTS),y)
  81         KBUILD_CFLAGS += -fno-omit-frame-pointer
  82 endif
  83
  84 # Avoid generating .eh_frame sections.
  85 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  86
  87 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  88 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  89
  90 # GCC versions that support the "-mstrict-align" option default to allowing
  91 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  92 # RISC-V ISA, they're emulated by machine mode traps on all extant
  93 # architectures.  It's faster to have GCC emit only aligned accesses.
  94 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  95
  96 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  97 prepare: stack_protector_prepare
  98 stack_protector_prepare: prepare0
  99         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
 100                                 -mstack-protector-guard-reg=tp            \
 101                                 -mstack-protector-guard-offset=$(shell    \
 102                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 103                                         include/generated/asm-offsets.h))
 104 endif
 105
 106 # arch specific predefines for sparse
 107 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 108
 109 # Default target when executing plain make
 110 boot            := arch/riscv/boot
 111 ifeq ($(CONFIG_XIP_KERNEL),y)
 112 KBUILD_IMAGE := $(boot)/xipImage
 113 else
 114 KBUILD_IMAGE    := $(boot)/Image.gz
 115 endif
 116
 117 libs-y += arch/riscv/lib/
 118 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 119
 120 PHONY += vdso_install
 121 vdso_install:
 122         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 123         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 124                 $(build)=arch/riscv/kernel/compat_vdso compat_$@)
 125
 126 ifeq ($(KBUILD_EXTMOD),)
 127 ifeq ($(CONFIG_MMU),y)
 128 prepare: vdso_prepare
 129 vdso_prepare: prepare0
 130         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 131         $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
 132                 $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
 133
 134 endif
 135 endif
 136
 137 ifneq ($(CONFIG_XIP_KERNEL),y)
 138 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_ARCH_CANAAN),yy)
 139 KBUILD_IMAGE := $(boot)/loader.bin
 140 else
 141 ifeq ($(CONFIG_EFI_ZBOOT),)
 142 KBUILD_IMAGE := $(boot)/Image.gz
 143 else
 144 KBUILD_IMAGE := $(boot)/vmlinuz.efi
 145 endif
 146 endif
 147 endif
 148 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi
 149
 150 all:    $(notdir $(KBUILD_IMAGE))
 151
 152 $(BOOT_TARGETS): vmlinux
 153         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 154         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 155
 156 Image.%: Image
 157         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 158
 159 install: KBUILD_IMAGE := $(boot)/Image
 160 zinstall: KBUILD_IMAGE := $(boot)/Image.gz
 161 install zinstall:
 162         $(call cmd,install)
 163
 164 PHONY += rv32_randconfig
 165 rv32_randconfig:
 166         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
 167                 -f $(srctree)/Makefile randconfig
 168
 169 PHONY += rv64_randconfig
 170 rv64_randconfig:
 171         $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
 172                 -f $(srctree)/Makefile randconfig
 173
 174 PHONY += rv32_defconfig
 175 rv32_defconfig:
 176         $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config