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126 lines
3.6 KiB
Makefile
126 lines
3.6 KiB
Makefile
# SPDX-License-Identifier: GPL-3.0-only
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#
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# Detached kernel BTF for CO-RE eBPF (dae/daed) on firmware whose kernel was
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# built without CONFIG_DEBUG_INFO_BTF. Builds a shadow kernel from the same
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# OpenWrt source + .config with BTF enabled, then pahole-encodes a detached
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# vmlinux.btf. cilium/ebpf finds it at /usr/lib/debug/boot/vmlinux-<release>.
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=vmlinux-btf
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PKG_VERSION:=$(LINUX_VERSION)
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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PKG_BUILD_PARALLEL:=1
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define Package/vmlinux-btf
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SECTION:=kernel
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CATEGORY:=Kernel
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TITLE:=Kernel vmlinux.btf for CO-RE compatibility
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endef
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define Package/vmlinux-btf/description
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Supplies detached kernel BTF so CO-RE eBPF programs (dae/daed) load on
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kernels built without CONFIG_DEBUG_INFO_BTF. Builds a shadow kernel from the
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OpenWrt kernel source with BTF enabled and encodes a detached vmlinux.btf.
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endef
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define Package/vmlinux-btf/postinst
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#!/bin/sh
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if [ -z "$${IPKG_INSTROOT}" ]; then
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ln -sf /usr/lib/debug/boot/vmlinux /usr/lib/debug/boot/vmlinux-$$(uname -r)
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fi
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endef
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define Package/vmlinux-btf/prerm
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#!/bin/sh
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if [ -z "$${IPKG_INSTROOT}" ]; then
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rm -f /usr/lib/debug/boot/vmlinux-$$(uname -r)
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fi
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endef
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PAHOLE_JOBS := $(if $(filter -j%,$(PKG_JOBS)),$(patsubst -j%,%,$(filter -j%,$(PKG_JOBS))),1)
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# The SDK ships an extracted kernel but no dl/ tarball, so fetch vanilla source.
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KERNEL_MAJOR:=$(firstword $(subst ., ,$(LINUX_VERSION)))
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LINUX_TARBALL_URL:=https://cdn.kernel.org/pub/linux/kernel/v$(KERNEL_MAJOR).x/$(LINUX_SOURCE)
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR) $(DL_DIR)
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[ -f "$(DL_DIR)/$(LINUX_SOURCE)" ] || \
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wget -nv -O "$(DL_DIR)/$(LINUX_SOURCE)" "$(LINUX_TARBALL_URL)"
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$(TAR) -C $(PKG_BUILD_DIR) -xf $(DL_DIR)/$(LINUX_SOURCE)
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mv $(PKG_BUILD_DIR)/linux-$(LINUX_VERSION) $(PKG_BUILD_DIR)/shadow-kernel
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cp $(LINUX_DIR)/.config $(PKG_BUILD_DIR)/shadow-kernel/.config
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endef
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define Build/Compile
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$(PKG_BUILD_DIR)/shadow-kernel/scripts/config \
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--file $(PKG_BUILD_DIR)/shadow-kernel/.config \
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--disable WERROR \
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--enable CGROUPS \
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--enable CGROUP_BPF \
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--enable SOCK_CGROUP_DATA \
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--enable KALLSYMS \
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--enable PERF_EVENTS \
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--enable TRACEPOINTS \
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--enable KPROBES \
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--enable UPROBES \
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--enable BPF \
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--enable BPF_SYSCALL \
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--enable BPF_JIT \
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--enable BPF_JIT_DEFAULT_ON \
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--enable INET \
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--enable NET_INGRESS \
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--enable NET_EGRESS \
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--enable BPF_STREAM_PARSER \
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--enable XDP_SOCKETS \
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--enable NET_SCHED \
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--enable NET_SCH_INGRESS \
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--enable NET_CLS \
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--enable NET_CLS_ACT \
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--enable KPROBE_EVENTS \
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--enable UPROBE_EVENTS \
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--enable BPF_EVENTS \
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--enable DEBUG_KERNEL \
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--enable DEBUG_INFO \
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--disable DEBUG_INFO_NONE \
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--enable DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT \
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--disable DEBUG_INFO_REDUCED \
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--disable DEBUG_INFO_SPLIT \
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--enable DEBUG_INFO_BTF \
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--set-str EXTRA_FIRMWARE "" \
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--set-str INITRAMFS_SOURCE ""
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$(MAKE) -C $(PKG_BUILD_DIR)/shadow-kernel \
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$(KERNEL_MAKE_FLAGS) \
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KBUILD_HOSTLDFLAGS="$(KBUILD_HOSTLDFLAGS) -lz" \
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olddefconfig
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$(MAKE) -C $(PKG_BUILD_DIR)/shadow-kernel \
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$(KERNEL_MAKE_FLAGS) \
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$(PKG_JOBS) \
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KBUILD_HOSTLDFLAGS="-L$(STAGING_DIR_HOST)/lib -lz" \
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vmlinux
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pahole \
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--jobs=$(PAHOLE_JOBS) \
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--btf_encode_detached=$(PKG_BUILD_DIR)/vmlinux-btf \
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$(PKG_BUILD_DIR)/shadow-kernel/vmlinux
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endef
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define Build/Clean
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rm -rf $(PKG_BUILD_DIR)
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endef
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define Package/vmlinux-btf/install
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$(INSTALL_DIR) $(1)/usr/lib/debug/boot
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$(INSTALL_DATA) $(PKG_BUILD_DIR)/vmlinux-btf $(1)/usr/lib/debug/boot/vmlinux
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$(LN) vmlinux $(1)/usr/lib/debug/boot/vmlinux-$(LINUX_VERSION)
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endef
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$(eval $(call BuildPackage,vmlinux-btf))
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