From 33a57ce0a54d498275f432db04850001175dfdfa Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Sat, 11 Jul 2020 23:53:22 +0200 Subject: bpf: Compile resolve_btfids tool at kernel compilation start The resolve_btfids tool will be used during the vmlinux linking, so it's necessary it's ready for it. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Tested-by: Andrii Nakryiko Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200711215329.41165-3-jolsa@kernel.org --- Makefile | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index ac2c61c37a73..017e775b3288 100644 --- a/Makefile +++ b/Makefile @@ -1053,9 +1053,10 @@ export mod_sign_cmd HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf) +has_libelf = $(call try-run,\ + echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) + ifdef CONFIG_STACK_VALIDATION - has_libelf := $(call try-run,\ - echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0) ifeq ($(has_libelf),1) objtool_target := tools/objtool FORCE else @@ -1064,6 +1065,14 @@ ifdef CONFIG_STACK_VALIDATION endif endif +ifdef CONFIG_DEBUG_INFO_BTF + ifeq ($(has_libelf),1) + resolve_btfids_target := tools/bpf/resolve_btfids FORCE + else + ERROR_RESOLVE_BTFIDS := 1 + endif +endif + PHONY += prepare0 export MODORDER := $(extmod-prefix)modules.order @@ -1175,7 +1184,7 @@ prepare0: archprepare $(Q)$(MAKE) $(build)=. # All the preparing.. -prepare: prepare0 prepare-objtool +prepare: prepare0 prepare-objtool prepare-resolve_btfids # Support for using generic headers in asm-generic asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj @@ -1188,7 +1197,7 @@ uapi-asm-generic: $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ generic=include/uapi/asm-generic -PHONY += prepare-objtool +PHONY += prepare-objtool prepare-resolve_btfids prepare-objtool: $(objtool_target) ifeq ($(SKIP_STACK_VALIDATION),1) ifdef CONFIG_UNWINDER_ORC @@ -1199,6 +1208,11 @@ else endif endif +prepare-resolve_btfids: $(resolve_btfids_target) +ifeq ($(ERROR_RESOLVE_BTFIDS),1) + @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 + @false +endif # Generate some files # --------------------------------------------------------------------------- -- cgit v1.2.3 From c9a0f3b85e09dd16665b639cb884490410619434 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Sat, 11 Jul 2020 23:53:24 +0200 Subject: bpf: Resolve BTF IDs in vmlinux image Using BTF_ID_LIST macro to define lists for several helpers using BTF arguments. And running resolve_btfids on vmlinux elf object during linking, so the .BTF_ids section gets the IDs resolved. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Tested-by: Andrii Nakryiko Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200711215329.41165-5-jolsa@kernel.org --- Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 017e775b3288..462f1a75fcb3 100644 --- a/Makefile +++ b/Makefile @@ -448,6 +448,7 @@ OBJSIZE = $(CROSS_COMPILE)size STRIP = $(CROSS_COMPILE)strip endif PAHOLE = pahole +RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids LEX = flex YACC = bison AWK = awk @@ -510,7 +511,7 @@ GCC_PLUGINS_CFLAGS := CLANG_FLAGS := export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC -export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL +export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE -- cgit v1.2.3