include/bpf.mk

   1 BPF_DEPENDS := @HAS_BPF_TOOLCHAIN
   2 LLVM_VER:=
   3
   4 CLANG_MIN_VER:=12
   5
   6 ifneq ($(CONFIG_USE_LLVM_HOST),)
   7   BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
   8   ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
   9     BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
  10   else
  11     BPF_PATH:=$(PATH)
  12   endif
  13   CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
  14   LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
  15 endif
  16 ifneq ($(CONFIG_USE_LLVM_PREBUILT),)
  17   CLANG:=$(TOPDIR)/llvm-bpf/bin/clang
  18 endif
  19 ifneq ($(CONFIG_USE_LLVM_BUILD),)
  20   CLANG:=$(STAGING_DIR_HOST)/llvm-bpf/bin/clang
  21 endif
  22
  23 LLVM_PATH:=$(dir $(CLANG))
  24 LLVM_LLC:=$(LLVM_PATH)/llc$(LLVM_VER)
  25 LLVM_DIS:=$(LLVM_PATH)/llvm-dis$(LLVM_VER)
  26 LLVM_OPT:=$(LLVM_PATH)/opt$(LLVM_VER)
  27 LLVM_STRIP:=$(LLVM_PATH)/llvm-strip$(LLVM_VER)
  28
  29 BPF_KARCH:=mips
  30 BPF_ARCH:=mips$(if $(CONFIG_ARCH_64BIT),64)$(if $(CONFIG_BIG_ENDIAN),,el)
  31 BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)
  32
  33 BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
  34
  35 BPF_KERNEL_INCLUDE := \
  36         -nostdinc -isystem $(TOOLCHAIN_DIR)/include \
  37         -I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
  38         -I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
  39         -I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
  40         -I$(BPF_HEADERS_DIR)/include \
  41         -I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
  42         -I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
  43         -I$(BPF_HEADERS_DIR)/include/uapi \
  44         -I$(BPF_HEADERS_DIR)/include/generated/uapi \
  45         -I$(BPF_HEADERS_DIR)/tools/lib \
  46         -I$(BPF_HEADERS_DIR)/tools/testing/selftests \
  47         -I$(BPF_HEADERS_DIR)/samples/bpf \
  48         -include linux/kconfig.h -include asm_goto_workaround.h
  49
  50 BPF_CFLAGS := \
  51         $(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
  52         -D__KERNEL__ -D__BPF_TRACING__ -DCONFIG_GENERIC_CSUM \
  53         -D__TARGET_ARCH_${BPF_KARCH} \
  54         -m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
  55         -fno-stack-protector -Wall \
  56         -Wno-unused-value -Wno-pointer-sign \
  57         -Wno-compare-distinct-pointer-types \
  58         -Wno-gnu-variable-sized-type-not-at-end \
  59         -Wno-address-of-packed-member -Wno-tautological-compare \
  60         -Wno-unknown-warning-option \
  61         -fno-asynchronous-unwind-tables \
  62         -Wno-uninitialized -Wno-unused-variable \
  63         -Wno-unused-label \
  64         -O2 -emit-llvm -Xclang -disable-llvm-passes
  65
  66 ifeq ($(DUMP),)
  67   CLANG_VER:=$(shell $(CLANG) -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
  68   CLANG_VER_VALID:=$(shell [ "$(CLANG_VER)" -ge "$(CLANG_MIN_VER)" ] && echo 1 )
  69   ifeq ($(CLANG_VER_VALID),)
  70     $(error ERROR: LLVM/clang version too old. Minimum required: $(CLANG_MIN_VER), found: $(CLANG_VER))
  71   endif
  72 endif
  73
  74 define CompileBPF
  75         $(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(2) \
  76                 -c $(1) -o $(patsubst %.c,%.bc,$(1))
  77         $(LLVM_OPT) -O2 -mtriple=$(BPF_TARGET) < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
  78         $(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
  79         $(LLVM_LLC) -march=$(BPF_TARGET) -mcpu=v3 -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
  80         $(CP) $(patsubst %.c,%.o,$(1)) $(patsubst %.c,%.debug.o,$(1))
  81         $(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
  82 endef
  83