1# kbuild trick to avoid linker error. Can be omitted if a module is built. 2obj- := dummy.o 3 4# List of programs to build 5hostprogs-y := sockmap 6 7# Libbpf dependencies 8LIBBPF := ../../tools/lib/bpf/bpf.o 9 10HOSTCFLAGS += -I$(objtree)/usr/include 11HOSTCFLAGS += -I$(srctree)/tools/lib/ 12HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/ 13HOSTCFLAGS += -I$(srctree)/tools/lib/ -I$(srctree)/tools/include 14HOSTCFLAGS += -I$(srctree)/tools/perf 15 16sockmap-objs := ../bpf/bpf_load.o $(LIBBPF) sockmap_user.o 17 18# Tell kbuild to always build the programs 19always := $(hostprogs-y) 20always += sockmap_kern.o 21 22HOSTLOADLIBES_sockmap += -lelf -lpthread 23 24# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline: 25# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang 26LLC ?= llc 27CLANG ?= clang 28 29# Trick to allow make to be run from this directory 30all: 31 $(MAKE) -C ../../ $(CURDIR)/ 32 33clean: 34 $(MAKE) -C ../../ M=$(CURDIR) clean 35 @rm -f *~ 36 37$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c 38 $(call if_changed_dep,cc_s_c) 39 40$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE 41 $(call filechk,offsets,__SYSCALL_NRS_H__) 42 43clean-files += syscall_nrs.h 44 45FORCE: 46 47 48# Verify LLVM compiler tools are available and bpf target is supported by llc 49.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC) 50 51verify_cmds: $(CLANG) $(LLC) 52 @for TOOL in $^ ; do \ 53 if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \ 54 echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\ 55 exit 1; \ 56 else true; fi; \ 57 done 58 59verify_target_bpf: verify_cmds 60 @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \ 61 echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\ 62 echo " NOTICE: LLVM version >= 3.7.1 required" ;\ 63 exit 2; \ 64 else true; fi 65 66$(src)/*.c: verify_target_bpf 67 68# asm/sysreg.h - inline assembly used by it is incompatible with llvm. 69# But, there is no easy way to fix it, so just exclude it since it is 70# useless for BPF samples. 71$(obj)/%.o: $(src)/%.c 72 $(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \ 73 -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \ 74 -Wno-compare-distinct-pointer-types \ 75 -Wno-gnu-variable-sized-type-not-at-end \ 76 -Wno-address-of-packed-member -Wno-tautological-compare \ 77 -Wno-unknown-warning-option \ 78 -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@ 79