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. Remember to do have actions
   3 # for "archclean" and "archdep" for cleaning up and making dependencies for
   4 # this architecture
   5 #
   6 # This file is subject to the terms and conditions of the GNU General Public
   7 # License.  See the file "COPYING" in the main directory of this archive
   8 # for more details.
   9 #
  10
  11 OBJCOPYFLAGS    := -O binary
  12 LDFLAGS_vmlinux :=
  13 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  14         LDFLAGS_vmlinux := --no-relax
  15         KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
  16         CC_FLAGS_FTRACE := -fpatchable-function-entry=8
  17 endif
  18
  19 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  20 KBUILD_CFLAGS_MODULE += -mcmodel=medany
  21 endif
  22
  23 export BITS
  24 ifeq ($(CONFIG_ARCH_RV64I),y)
  25         BITS := 64
  26         UTS_MACHINE := riscv64
  27
  28         KBUILD_CFLAGS += -mabi=lp64
  29         KBUILD_AFLAGS += -mabi=lp64
  30
  31         KBUILD_LDFLAGS += -melf64lriscv
  32 else
  33         BITS := 32
  34         UTS_MACHINE := riscv32
  35
  36         KBUILD_CFLAGS += -mabi=ilp32
  37         KBUILD_AFLAGS += -mabi=ilp32
  38         KBUILD_LDFLAGS += -melf32lriscv
  39 endif
  40
  41 ifeq ($(CONFIG_LD_IS_LLD),y)
  42         KBUILD_CFLAGS += -mno-relax
  43         KBUILD_AFLAGS += -mno-relax
  44 ifndef CONFIG_AS_IS_LLVM
  45         KBUILD_CFLAGS += -Wa,-mno-relax
  46         KBUILD_AFLAGS += -Wa,-mno-relax
  47 endif
  48 endif
  49
  50 # ISA string setting
  51 riscv-march-$(CONFIG_ARCH_RV32I)        := rv32ima
  52 riscv-march-$(CONFIG_ARCH_RV64I)        := rv64ima
  53 riscv-march-$(CONFIG_FPU)               := $(riscv-march-y)fd
  54 riscv-march-y                           := $(subst imafd,g,$(riscv-march-y))
  55 riscv-march-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  56 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  57 KBUILD_AFLAGS += -march=$(riscv-march-y)
  58
  59 KBUILD_CFLAGS += -mno-save-restore
  60 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  61
  62 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  63         KBUILD_CFLAGS += -mcmodel=medlow
  64 endif
  65 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  66         KBUILD_CFLAGS += -mcmodel=medany
  67 endif
  68 ifeq ($(CONFIG_PERF_EVENTS),y)
  69         KBUILD_CFLAGS += -fno-omit-frame-pointer
  70 endif
  71
  72 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  73
  74 # GCC versions that support the "-mstrict-align" option default to allowing
  75 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  76 # RISC-V ISA, they're emulated by machine mode traps on all extant
  77 # architectures.  It's faster to have GCC emit only aligned accesses.
  78 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  79
  80 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  81 prepare: stack_protector_prepare
  82 stack_protector_prepare: prepare0
  83         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  84                                 -mstack-protector-guard-reg=tp            \
  85                                 -mstack-protector-guard-offset=$(shell    \
  86                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  87                                         include/generated/asm-offsets.h))
  88 endif
  89
  90 # arch specific predefines for sparse
  91 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  92
  93 # Default target when executing plain make
  94 boot            := arch/riscv/boot
  95 ifeq ($(CONFIG_XIP_KERNEL),y)
  96 KBUILD_IMAGE := $(boot)/xipImage
  97 else
  98 KBUILD_IMAGE    := $(boot)/Image.gz
  99 endif
 100
 101 head-y := arch/riscv/kernel/head.o
 102
 103 core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
 104
 105 libs-y += arch/riscv/lib/
 106 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 107
 108 PHONY += vdso_install
 109 vdso_install:
 110         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 111
 112 ifeq ($(CONFIG_MMU),y)
 113 prepare: vdso_prepare
 114 vdso_prepare: prepare0
 115         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 116 endif
 117
 118 ifneq ($(CONFIG_XIP_KERNEL),y)
 119 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 120 KBUILD_IMAGE := $(boot)/loader.bin
 121 else
 122 KBUILD_IMAGE := $(boot)/Image.gz
 123 endif
 124 endif
 125 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 126
 127 all:    $(notdir $(KBUILD_IMAGE))
 128
 129 $(BOOT_TARGETS): vmlinux
 130         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 131         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 132
 133 Image.%: Image
 134         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 135
 136 install: install-image = Image
 137 zinstall: install-image = Image.gz
 138 install zinstall:
 139         $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
 140         $(boot)/$(install-image) System.map "$(INSTALL_PATH)"
 141
 142 archclean:
 143         $(Q)$(MAKE) $(clean)=$(boot)