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| author | Felix Fietkau <nbd@nbd.name> | 2021-10-26 20:41:22 +0200 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2021-11-01 16:39:09 +0100 |
| commit | a537d06c72853c054c57d75af4074c1749e47947 (patch) | |
| tree | 09ae09d133cf8320c4b2fd995d064f043c844218 /include | |
| parent | 5ad663b7652e06e430209c2b3f5ab835181082e7 (diff) | |
| download | upstream-a537d06c72853c054c57d75af4074c1749e47947.tar.gz upstream-a537d06c72853c054c57d75af4074c1749e47947.tar.bz2 upstream-a537d06c72853c054c57d75af4074c1749e47947.zip | |
bpf-headers: add a package with kernel headers for ebpf
In order to genererate suitable kernel headers, a 5.10 kernel tree is
prepared with a default config for mips. The arch is forced to mips in
order to avoid issues with inline asm on various architectures in a way
that doesn't involve relying on the host toolchain/headers.
It also has the advantage of supporting both endian types
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'include')
| -rw-r--r-- | include/bpf.mk | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/include/bpf.mk b/include/bpf.mk new file mode 100644 index 0000000000..3dc65c7685 --- /dev/null +++ b/include/bpf.mk @@ -0,0 +1,65 @@ +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:=$(BPF_PATH) + endif + CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11)) + LLVM_VER:=$(subst clang,,$(notdir $(CLANG))) +else + CLANG:=$(STAGING_DIR_HOST)/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 $(CONFIG_BIG_ENDIAN),,el) + +BPF_HEADERS_DIR:=$(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-pc-linux < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1)) + $(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1)) + $(LLVM_LLC) -march=bpf -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1)) + $(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1)) +endef + |