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 ($(CONFIG_DYNAMIC_FTRACE),y)
  14         LDFLAGS_vmlinux := --no-relax
  15 endif
  16
  17 ifeq ($(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 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
  41         KBUILD_CFLAGS += -mno-relax
  42         KBUILD_AFLAGS += -mno-relax
  43 ifndef CONFIG_AS_IS_LLVM
  44         KBUILD_CFLAGS += -Wa,-mno-relax
  45         KBUILD_AFLAGS += -Wa,-mno-relax
  46 endif
  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-$(CONFIG_RISCV_ISA_C)       := $(riscv-march-y)c
  55
  56 ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
  57 KBUILD_CFLAGS += -Wa,-misa-spec=2.2
  58 KBUILD_AFLAGS += -Wa,-misa-spec=2.2
  59 else
  60 riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
  61 endif
  62
  63 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
  64 KBUILD_AFLAGS += -march=$(riscv-march-y)
  65
  66 KBUILD_CFLAGS += -mno-save-restore
  67 KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
  68
  69 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  70         KBUILD_CFLAGS += -mcmodel=medlow
  71 endif
  72 ifeq ($(CONFIG_CMODEL_MEDANY),y)
  73         KBUILD_CFLAGS += -mcmodel=medany
  74 endif
  75 ifeq ($(CONFIG_PERF_EVENTS),y)
  76         KBUILD_CFLAGS += -fno-omit-frame-pointer
  77 endif
  78
  79 # Avoid generating .eh_frame sections.
  80 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
  81
  82 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
  83 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
  84
  85 # GCC versions that support the "-mstrict-align" option default to allowing
  86 # unaligned accesses.  While unaligned accesses are explicitly allowed in the
  87 # RISC-V ISA, they're emulated by machine mode traps on all extant
  88 # architectures.  It's faster to have GCC emit only aligned accesses.
  89 KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
  90
  91 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  92 prepare: stack_protector_prepare
  93 stack_protector_prepare: prepare0
  94         $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls               \
  95                                 -mstack-protector-guard-reg=tp            \
  96                                 -mstack-protector-guard-offset=$(shell    \
  97                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  98                                         include/generated/asm-offsets.h))
  99 endif
 100
 101 # arch specific predefines for sparse
 102 CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
 103
 104 # Default target when executing plain make
 105 boot            := arch/riscv/boot
 106 KBUILD_IMAGE    := $(boot)/Image.gz
 107
 108 head-y := arch/riscv/kernel/head.o
 109
 110 core-y += arch/riscv/
 111
 112 libs-y += arch/riscv/lib/
 113 libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 114
 115 PHONY += vdso_install
 116 vdso_install:
 117         $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 118
 119 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_KENDRYTE),yy)
 120 KBUILD_IMAGE := $(boot)/loader.bin
 121 else
 122 KBUILD_IMAGE := $(boot)/Image.gz
 123 endif
 124 BOOT_TARGETS := Image Image.gz loader loader.bin
 125
 126 all:    $(notdir $(KBUILD_IMAGE))
 127
 128 $(BOOT_TARGETS): vmlinux
 129         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 130         @$(kecho) '  Kernel: $(boot)/$@ is ready'
 131
 132 zinstall install:
 133         $(Q)$(MAKE) $(build)=$(boot) $@