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)       := $(riscv-march-y)c
  53 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  54 KBUILD_AFLAGS += -march=$(riscv-march-y)
  55
  56 KBUILD_CFLAGS += -mno-save-restore
  57 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  58
  59 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  60         KBUILD_CFLAGS += -mcmodel=medlow
  61 endif
  62 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  63         KBUILD_CFLAGS += -mcmodel=medany
  64 endif
  65 ifeq ($(CONFIG_PERF_EVENTS),y)
  66         KBUILD_CFLAGS += -fno-omit-frame-pointer
  67 endif
  68
  69 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  70
  71 # GCC versions that support the "-mstrict-align" option default to allowing
  72 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  73 # RISC-V ISA, they're emulated by machine mode traps on all extant
  74 # architectures.  It's faster to have GCC emit only aligned accesses.
  75 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  76
  77 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  78 prepare: stack_protector_prepare
  79 stack_protector_prepare: prepare0
  80         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  81                                 -mstack-protector-guard-reg=tp            \
  82                                 -mstack-protector-guard-offset=$(shell    \
  83                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  84                                         include/generated/asm-offsets.h))
  85 endif
  86
  87 # arch specific predefines for sparse
  88 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
  89
  90 # Default target when executing plain make
  91 boot            := arch/riscv/boot
  92 ifeq ($(CONFIG_XIP_KERNEL),y)
  93 KBUILD_IMAGE := $(boot)/xipImage
  94 else
  95 KBUILD_IMAGE    := $(boot)/Image.gz
  96 endif
  97
  98 head-y := arch/riscv/kernel/head.o
  99
 100 core-$(CONFIG_RISCV_ERRATA_ALTERNATIVE) += arch/riscv/errata/
 101 core-$(CONFIG_KVM) += arch/riscv/kvm/
 102
 103 libs-y += arch/riscv/lib/
 104 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 105
 106 PHONY += vdso_install
 107 vdso_install:
 108         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 109
 110 ifeq ($(CONFIG_MMU),y)
 111 prepare: vdso_prepare
 112 vdso_prepare: prepare0
 113         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 114 endif
 115
 116 ifneq ($(CONFIG_XIP_KERNEL),y)
 117 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)
 118 KBUILD_IMAGE := $(boot)/loader.bin
 119 else
 120 KBUILD_IMAGE := $(boot)/Image.gz
 121 endif
 122 endif
 123 BOOT_TARGETS := Image Image.gz loader loader.bin xipImage
 124
 125 all:    $(notdir $(KBUILD_IMAGE))
 126
 127 $(BOOT_TARGETS): vmlinux
 128         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 129         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 130
 131 Image.%: Image
 132         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 133
 134 install: install-image = Image
 135 zinstall: install-image = Image.gz
 136 install zinstall:
 137         $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
 138         $(boot)/$(install-image) System.map "$(INSTALL_PATH)"