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Makefile
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.PHONY: all clean
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.SUFFIXES:
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include ./Makefile.defs
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ALIGNCHECKERDIR = alignchecker/
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PROCESSDIR := process/
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CGROUPDIR := cgroup/
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BPFTESTDIR := test/
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ALIGNCHECKER = bpf_alignchecker.o
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PROCESS = bpf_execve_event.o bpf_execve_event_v53.o bpf_fork.o bpf_exit.o bpf_generic_kprobe.o \
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	  bpf_execve_bprm_commit_creds.o \
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	  bpf_generic_kprobe_v53.o bpf_generic_retkprobe.o bpf_generic_retkprobe_v53.o \
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	  bpf_multi_kprobe_v53.o bpf_multi_retkprobe_v53.o \
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	  bpf_generic_tracepoint.o bpf_generic_tracepoint_v53.o \
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	  bpf_generic_uprobe.o bpf_generic_uprobe_v53.o \
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	  bpf_execve_event_v61.o \
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	  bpf_generic_kprobe_v61.o bpf_generic_retkprobe_v61.o \
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	  bpf_generic_tracepoint_v61.o \
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	  bpf_multi_kprobe_v61.o bpf_multi_retkprobe_v61.o \
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	  bpf_generic_uprobe_v61.o \
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	  bpf_multi_uprobe_v61.o \
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	  bpf_execve_event_v511.o \
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	  bpf_generic_kprobe_v511.o bpf_generic_retkprobe_v511.o \
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	  bpf_generic_tracepoint_v511.o \
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	  bpf_multi_kprobe_v511.o bpf_multi_retkprobe_v511.o \
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	  bpf_generic_uprobe_v511.o \
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	  bpf_loader.o \
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	  bpf_cgroup.o \
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	  bpf_enforcer.o bpf_multi_enforcer.o bpf_fmodret_enforcer.o
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CGROUP = bpf_cgroup_mkdir.o bpf_cgroup_rmdir.o bpf_cgroup_release.o
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BPFTEST = bpf_lseek.o
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OBJSDIR       := objs/
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DEPSDIR       := deps/
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TLSOBJ        := $(addprefix $(OBJSDIR),$(TLS))
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NOPOBJ        := $(addprefix $(OBJSDIR),$(NOP))
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PROCESSOBJ    := $(addprefix $(OBJSDIR),$(PROCESS))
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CGROUPOBJ     := $(addprefix $(OBJSDIR),$(CGROUP))
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TESTOBJ       := $(addprefix $(OBJSDIR),$(BPFTEST))
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ALIGNCHECKEROBJ := $(addprefix $(OBJSDIR),$(ALIGNCHECKER))
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OBJS          := $(PROCESSOBJ) $(CGROUPOBJ) $(TESTOBJ) $(NOPOBJ) $(ALIGNCHECKEROBJ)
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LLOBJS        := $(patsubst $(OBJSDIR)%.o,$(OBJSDIR)%.ll,$(OBJS))
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DEPS          := $(patsubst $(OBJSDIR)%.ll,$(DEPSDIR)%.d,$(LLOBJS))
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all: $(OBJS) $(DEPS)
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# NB: https://www.gnu.org/software/make/manual/html_node/Prerequisite-Types.html
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$(OBJS): | $(OBJSDIR)
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$(DEPS): | $(DEPSDIR)
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$(LLOBJS): | $(OBJSDIR)
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$(OBJSDIR):
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	mkdir $(OBJSDIR)
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$(DEPSDIR):
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	mkdir $(DEPSDIR)
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define DEFINE_VARIANT
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VAR := $1
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deps/bpf_execve_event_$$(VAR).d: process/bpf_execve_event.c
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deps/bpf_generic_kprobe_$$(VAR).d: process/bpf_generic_kprobe.c
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deps/bpf_generic_retkprobe_$$(VAR).d: process/bpf_generic_retkprobe.c
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deps/bpf_multi_kprobe_$$(VAR).d: process/bpf_generic_kprobe.c
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deps/bpf_multi_retkprobe_$$(VAR).d: process/bpf_generic_retkprobe.c
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deps/bpf_generic_tracepoint_$$(VAR).d: process/bpf_generic_tracepoint.c
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deps/bpf_generic_uprobe_$$(VAR).d: process/bpf_generic_uprobe.c
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deps/bpf_multi_uprobe_$$(VAR).d: process/bpf_generic_uprobe.c
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endef
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# Generic build targets for each sub-dir
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$(eval $(call DEFINE_VARIANT,v53))
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$(eval $(call DEFINE_VARIANT,v511))
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$(eval $(call DEFINE_VARIANT,v61))
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# ALIGNCHECKER
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objs/%.ll: $(ALIGNCHECKERDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -c $< -o $@
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$(DEPSDIR)%.d: $(ALIGNCHECKERDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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# Enforcer programs: bpf_enforcer, bpf_multi_enforcer, bpf_fmodret_enforcer
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## bpf_enforcer: __BPF_OVERRIDE_RETURN, but no __MULTI_KPROBE
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objs/bpf_enforcer.ll: process/bpf_enforcer.c
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	$(CLANG) $(CLANG_FLAGS) -D__BPF_OVERRIDE_RETURN -c $< -o $@
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$(DEPSDIR)bpf_enforcer.d: process/bpf_enforcer.c
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	$(CLANG) $(CLANG_FLAGS) -D__BPF_OVERRIDE_RETURN -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@) $< > $@
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## bpf_multi_enforcer: __BPF_OVERRIDE_RETURN and __MULTI_KPROBE
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objs/bpf_multi_enforcer.ll: process/bpf_enforcer.c
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	$(CLANG) $(CLANG_FLAGS) -D__BPF_OVERRIDE_RETURN -D__MULTI_KPROBE -c $< -o $@
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$(DEPSDIR)/bpf_multi_enforcer.d: process/bpf_enforcer.c
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	$(CLANG) $(CLANG_FLAGS) -D__BPF_OVERRIDE_RETURN -D__MULTI_KPROBE -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@) $< > $@
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## bpf_fmodret_enforcer no bpf_override_return: we need fmod_ret
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objs/bpf_fmodret_enforcer.ll: process/bpf_enforcer.c
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	$(CLANG) $(CLANG_FLAGS) -c $< -o $@
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$(DEPSDIR)/bpf_fmodret_enforcer.d: process/bpf_enforcer.c
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	$(CLANG) $(CLANG_FLAGS) -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@) $< > $@
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# PROCESSDIR
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objs/%.ll: $(PROCESSDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -c $< -o $@
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objs/bpf_multi_kprobe_v53.ll objs/bpf_multi_retkprobe_v53.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__MULTI_KPROBE -c $< -o $@
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objs/%_v53.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -c $< -o $@
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$(DEPSDIR)%.d: $(PROCESSDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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$(DEPSDIR)%_v53.d:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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objs/bpf_multi_kprobe_v61.ll objs/bpf_multi_retkprobe_v61.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__LARGE_MAP_KEYS -D__V61_BPF_PROG -D__MULTI_KPROBE -c $< -o $@
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objs/bpf_multi_uprobe_v61.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__V61_BPF_PROG -D__MULTI_KPROBE -c $< -o $@
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objs/%_v61.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__LARGE_MAP_KEYS -D__V61_BPF_PROG -c $< -o $@
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$(DEPSDIR)%_v61.d:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__LARGE_MAP_KEYS -D__V61_BPF_PROG -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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objs/bpf_multi_kprobe_v511.ll objs/bpf_multi_retkprobe_v511.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__LARGE_MAP_KEYS -D__MULTI_KPROBE -c $< -o $@
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objs/%_v511.ll:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__LARGE_MAP_KEYS -c $< -o $@
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$(DEPSDIR)%_v511.d:
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	$(CLANG) $(CLANG_FLAGS) -D__LARGE_BPF_PROG -D__LARGE_MAP_KEYS -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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# BPFTESTDIR
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objs/%.ll: $(BPFTESTDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -c $< -o $@
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$(DEPSDIR)%.d: $(BPFTESTDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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# CGROUPDIR
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objs/%.ll: $(CGROUPDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -c $< -o $@
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$(DEPSDIR)%.d: $(CGROUPDIR)%.c
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	$(CLANG) $(CLANG_FLAGS) -MM -MP -MT $(patsubst $(DEPSDIR)%.d, $(OBJSDIR)%.ll, $@)   $< > $@
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# Remaining objects are built without mcpu=v2
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objs/%.o: objs/%.ll
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	$(LLC) $(LLC_FLAGS) -filetype=obj $< -o $@
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# include dependencies, see https://lists.gnu.org/archive/html/make-w32/2004-03/msg00062.html
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ifeq (,$(filter $(MAKECMDGOALS),clean run-test))
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-include $(DEPS)
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endif
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# the 'test' target is already taken
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run-test:
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	$(MAKE) -C tests test
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SUBDIRS=tests
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clean:
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	@$(ECHO_CLEAN)
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	$(QUIET) $(foreach TARGET,$(SUBDIRS), \
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		$(MAKE) -C $(TARGET) clean)
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	$(QUIET)rm -f $(OBJSDIR)*.{o,ll,i,s}
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	$(QUIET)rm -f $(DEPSDIR)*.d
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