aboutsummaryrefslogtreecommitdiffstats
path: root/include/bpf.mk
blob: 28cdf6cb3235f938077c521b2c0b86e19feb01db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
BPF_DEPENDS := @HAS_BPF_TOOLCHAIN

ifneq ($(CONFIG_BPF_TOOLCHAIN_HOST),)
  BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
  ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
    BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
  else
    BPF_PATH:=$(PATH)
  endif
  CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
  LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
else
  CLANG:=$(STAGING_DIR_HOST)/llvm-bpf/bin/clang
  LLVM_VER:=
endif

LLVM_PATH:=$(dir $(CLANG))
LLVM_LLC:=$(LLVM_PATH)/llc$(LLVM_VER)
LLVM_DIS:=$(LLVM_PATH)/llvm-dis$(LLVM_VER)
LLVM_OPT:=$(LLVM_PATH)/opt$(LLVM_VER)
LLVM_STRIP:=$(LLVM_PATH)/llvm-strip$(LLVM_VER)

BPF_KARCH:=mips
BPF_ARCH:=mips$(if $(CONFIG_BIG_ENDIAN),,el)
BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)

BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers

BPF_KERNEL_INCLUDE := \
	-nostdinc -isystem $(TOOLCHAIN_DIR)/include \
	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
	-I$(BPF_HEADERS_DIR)/include \
	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
	-I$(BPF_HEADERS_DIR)/include/uapi \
	-I$(BPF_HEADERS_DIR)/include/generated/uapi \
	-I$(BPF_HEADERS_DIR)/tools/lib \
	-I$(BPF_HEADERS_DIR)/tools/testing/selftests \
	-I$(BPF_HEADERS_DIR)/samples/bpf \
	-include linux/kconfig.h -include asm_goto_workaround.h

BPF_CFLAGS := \
	$(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
	-D__KERNEL__ -D__BPF_TRACING__ \
	-D__TARGET_ARCH_${BPF_KARCH} \
	-m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
	-fno-stack-protector -Wall \
	-Wno-unused-value -Wno-pointer-sign \
	-Wno-compare-distinct-pointer-types \
	-Wno-gnu-variable-sized-type-not-at-end \
	-Wno-address-of-packed-member -Wno-tautological-compare \
	-Wno-unknown-warning-option \
	-fno-asynchronous-unwind-tables \
	-Wno-uninitialized -Wno-unused-variable \
	-Wno-unused-label \
	-O2 -emit-llvm -Xclang -disable-llvm-passes

define CompileBPF
	$(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(2) \
		-c $(1) -o $(patsubst %.c,%.bc,$(1))
	$(LLVM_OPT) -O2 -mtriple=$(BPF_TARGET) < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
	$(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
	$(LLVM_LLC) -march=$(BPF_TARGET) -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
	$(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
endef