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#
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# american fuzzy lop - LLVM instrumentation
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# -----------------------------------------
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#
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# Written by Laszlo Szekeres <lszekeres@google.com> and
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# Michal Zalewski <lcamtuf@google.com>
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#
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# LLVM integration design comes from Laszlo Szekeres.
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#
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# Copyright 2015, 2016 Google LLC All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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PREFIX ?= /usr/local
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HELPER_PATH = $(PREFIX)/lib/afl
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BIN_PATH = $(PREFIX)/bin
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VERSION = $(shell grep '^\#define VERSION ' ../config.h | cut -d '"' -f2)
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LLVM_CONFIG ?= llvm-config
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CFLAGS ?= -O3 -funroll-loops
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CFLAGS += -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign \
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-DAFL_PATH=\"$(HELPER_PATH)\" -DBIN_PATH=\"$(BIN_PATH)\" \
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-DVERSION=\"$(VERSION)\"
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ifdef AFL_TRACE_PC
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CFLAGS += -DUSE_TRACE_PC=1
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endif
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CXXFLAGS ?= -O3 -funroll-loops
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CXXFLAGS += -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign \
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-DVERSION=\"$(VERSION)\" -Wno-variadic-macros
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# Mark nodelete to work around unload bug in upstream LLVM 5.0+
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CLANG_CFL = `$(LLVM_CONFIG) --cxxflags` -Wl,-znodelete -fno-rtti -fpic $(CXXFLAGS)
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CLANG_LFL = `$(LLVM_CONFIG) --ldflags` $(LDFLAGS)
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# User teor2345 reports that this is required to make things work on MacOS X.
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ifeq "$(shell uname)" "Darwin"
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CLANG_LFL += -Wl,-flat_namespace -Wl,-undefined,suppress
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endif
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# We were using llvm-config --bindir to get the location of clang, but
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# this seems to be busted on some distros, so using the one in $PATH is
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# probably better.
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ifeq "$(origin CC)" "default"
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CC = clang
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CXX = clang++
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endif
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ifndef AFL_TRACE_PC
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PROGS = ../afl-clang-fast ../afl-llvm-pass.so ../afl-llvm-rt.o ../afl-llvm-rt-32.o ../afl-llvm-rt-64.o
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else
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PROGS = ../afl-clang-fast ../afl-llvm-rt.o ../afl-llvm-rt-32.o ../afl-llvm-rt-64.o
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endif
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all: test_deps $(PROGS) test_build all_done
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test_deps:
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ifndef AFL_TRACE_PC
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@echo "[*] Checking for working 'llvm-config'..."
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@which $(LLVM_CONFIG) >/dev/null 2>&1 || ( echo "[-] Oops, can't find 'llvm-config'. Install clang or set \$$LLVM_CONFIG or \$$PATH beforehand."; echo " (Sometimes, the binary will be named llvm-config-3.5 or something like that.)"; exit 1 )
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else
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@echo "[!] Note: using -fsanitize=trace-pc mode (this will fail with older LLVM)."
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endif
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@echo "[*] Checking for working '$(CC)'..."
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@which $(CC) >/dev/null 2>&1 || ( echo "[-] Oops, can't find '$(CC)'. Make sure that it's in your \$$PATH (or set \$$CC and \$$CXX)."; exit 1 )
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@echo "[*] Checking for '../afl-showmap'..."
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@test -f ../afl-showmap || ( echo "[-] Oops, can't find '../afl-showmap'. Be sure to compile AFL first."; exit 1 )
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@echo "[+] All set and ready to build."
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../afl-clang-fast: afl-clang-fast.c | test_deps
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$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
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ln -sf afl-clang-fast ../afl-clang-fast++
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../afl-llvm-pass.so: afl-llvm-pass.so.cc | test_deps
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$(CXX) $(CLANG_CFL) -shared $< -o $@ $(CLANG_LFL)
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../afl-llvm-rt.o: afl-llvm-rt.o.c | test_deps
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$(CC) $(CFLAGS) -fPIC -c $< -o $@
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../afl-llvm-rt-32.o: afl-llvm-rt.o.c | test_deps
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@printf "[*] Building 32-bit variant of the runtime (-m32)... "
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@$(CC) $(CFLAGS) -m32 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
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../afl-llvm-rt-64.o: afl-llvm-rt.o.c | test_deps
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@printf "[*] Building 64-bit variant of the runtime (-m64)... "
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@$(CC) $(CFLAGS) -m64 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
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test_build: $(PROGS)
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@echo "[*] Testing the CC wrapper and instrumentation output..."
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unset AFL_USE_ASAN AFL_USE_MSAN AFL_INST_RATIO; AFL_QUIET=1 AFL_PATH=. AFL_CC=$(CC) ../afl-clang-fast $(CFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
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# Use /dev/null to avoid problems with optimization messing up expected
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# branches. See https://github.com/google/AFL/issues/30.
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../afl-showmap -m none -q -o .test-instr0 ./test-instr < /dev/null
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echo 1 | ../afl-showmap -m none -q -o .test-instr1 ./test-instr
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@rm -f test-instr
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@cmp -s .test-instr0 .test-instr1; DR="$$?"; rm -f .test-instr0 .test-instr1; if [ "$$DR" = "0" ]; then echo; echo "Oops, the instrumentation does not seem to be behaving correctly!"; echo; echo "Please ping <lcamtuf@google.com> to troubleshoot the issue."; echo; exit 1; fi
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@echo "[+] All right, the instrumentation seems to be working!"
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all_done: test_build
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@echo "[+] All done! You can now use '../afl-clang-fast' to compile programs."
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.NOTPARALLEL: clean
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clean:
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rm -f *.o *.so *~ a.out core core.[1-9][0-9]* test-instr .test-instr0 .test-instr1
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rm -f $(PROGS) ../afl-clang-fast++
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