include/bpf.mk

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