include/bpf.mk

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