1# Check the correctness of the prebuilt ELF files
2#
3# This check ensures that DT_SONAME matches with the filename, DT_NEEDED
4# matches the shared libraries specified in LOCAL_SHARED_LIBRARIES, and all
5# undefined symbols in the prebuilt binary can be found in one of the shared
6# libraries specified in LOCAL_SHARED_LIBRARIES.
7#
8# Inputs:
9# - LOCAL_ALLOW_UNDEFINED_SYMBOLS
10# - LOCAL_IGNORE_MAX_PAGE_SIZE
11# - LOCAL_BUILT_MODULE
12# - LOCAL_IS_HOST_MODULE
13# - LOCAL_MODULE_CLASS
14# - TARGET_CHECK_PREBUILT_MAX_PAGE_SIZE
15# - TARGET_MAX_PAGE_SIZE_SUPPORTED
16# - intermediates
17# - my_installed_module_stem
18# - my_prebuilt_src_file
19# - my_check_elf_file_shared_lib_files
20# - my_system_shared_libraries
21
22ifndef LOCAL_IS_HOST_MODULE
23ifneq ($(filter $(LOCAL_MODULE_CLASS),SHARED_LIBRARIES EXECUTABLES NATIVE_TESTS),)
24check_elf_files_stamp := $(intermediates)/check_elf_files.timestamp
25$(check_elf_files_stamp): PRIVATE_SONAME := $(if $(filter $(LOCAL_MODULE_CLASS),SHARED_LIBRARIES),$(my_installed_module_stem))
26$(check_elf_files_stamp): PRIVATE_ALLOW_UNDEFINED_SYMBOLS := $(LOCAL_ALLOW_UNDEFINED_SYMBOLS)
27$(check_elf_files_stamp): PRIVATE_SYSTEM_SHARED_LIBRARIES := $(my_system_shared_libraries)
28# PRIVATE_SHARED_LIBRARY_FILES are file paths to built shared libraries.
29# In addition to $(my_check_elf_file_shared_lib_files), some file paths are
30# added by `resolve-shared-libs-for-elf-file-check` from `core/main.mk`.
31$(check_elf_files_stamp): PRIVATE_SHARED_LIBRARY_FILES := $(my_check_elf_file_shared_lib_files)
32
33# For different page sizes to work, we must support a larger max page size
34# as well as properly reflect page size at runtime. Limit this check, since many
35# devices set the max page size (for future proof) than actually use the
36# larger page size.
37ifeq ($(strip $(TARGET_CHECK_PREBUILT_MAX_PAGE_SIZE)),true)
38ifeq ($(strip $(LOCAL_IGNORE_MAX_PAGE_SIZE)),true)
39$(check_elf_files_stamp): PRIVATE_MAX_PAGE_SIZE :=
40else
41$(check_elf_files_stamp): PRIVATE_MAX_PAGE_SIZE := $(TARGET_MAX_PAGE_SIZE_SUPPORTED)
42endif
43else
44$(check_elf_files_stamp): PRIVATE_MAX_PAGE_SIZE :=
45endif
46
47$(check_elf_files_stamp): $(my_prebuilt_src_file) $(my_check_elf_file_shared_lib_files) $(CHECK_ELF_FILE) $(LLVM_READOBJ)
48	@echo Check prebuilt ELF binary: $<
49	$(hide) mkdir -p $(dir $@)
50	$(hide) rm -f $@
51	$(hide) $(CHECK_ELF_FILE) \
52	    --skip-bad-elf-magic \
53	    --skip-unknown-elf-machine \
54	    $(if $(PRIVATE_MAX_PAGE_SIZE),--max-page-size=$(PRIVATE_MAX_PAGE_SIZE)) \
55	    $(if $(PRIVATE_SONAME),--soname $(PRIVATE_SONAME)) \
56	    $(foreach l,$(PRIVATE_SHARED_LIBRARY_FILES),--shared-lib $(l)) \
57	    $(foreach l,$(PRIVATE_SYSTEM_SHARED_LIBRARIES),--system-shared-lib $(l)) \
58	    $(if $(PRIVATE_ALLOW_UNDEFINED_SYMBOLS),--allow-undefined-symbols) \
59	    --llvm-readobj=$(LLVM_READOBJ) \
60	    $<
61	$(hide) touch $@
62
63CHECK_ELF_FILES.$(check_elf_files_stamp) := 1
64
65ifneq ($(strip $(LOCAL_CHECK_ELF_FILES)),false)
66ifneq ($(strip $(BUILD_BROKEN_PREBUILT_ELF_FILES)),true)
67$(LOCAL_BUILT_MODULE): $(check_elf_files_stamp)
68check-elf-files: $(check_elf_files_stamp)
69endif  # BUILD_BROKEN_PREBUILT_ELF_FILES
70endif  # LOCAL_CHECK_ELF_FILES
71
72endif  # SHARED_LIBRARIES, EXECUTABLES, NATIVE_TESTS
73endif  # !LOCAL_IS_HOST_MODULE
74