基於Android arm64 可執行程式的編譯執行
阿新 • • 發佈：2019-01-10
Android預設編譯的應用程式動態連結的一般都是PIE，前文“基於Android arm64 Linux got 除錯”，每次除錯都要檢視載入地址，於是就想能否編譯生成非PIE的應用程式。
/opt/android-6.0.1_r9/external/hello$ mmm ./ showcommands 2>&1 | tee build.log檢視build.log
prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-g++ -pie -nostdlib -Bdynamic -Wl 果然有-pie引數。在android編譯根路徑輸入去除-pie引數的命令：
/opt/android-6.0.1_r9$ prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-g++ -nostdlib -Bdynamic -Wl,-dynamic-linker,/system/bin/linker64 -Wl,--gc-sections -Wl,-z,nocopyreloc -Lout/target/product/generic_arm64/obj/lib -Wl,-rpath-link=out/target/product/generic_arm64/obj/lib out/target/product/generic_arm64/obj/lib/crtbegin_dynamic.o out/target/product/generic_arm64/obj/EXECUTABLES/hello_intermediates/hello.o -Wl,--whole-archive -Wl,--no-whole-archive out/target/product/generic_arm64/obj/STATIC_LIBRARIES/libcompiler_rt-extras_intermediates/libcompiler_rt-extras.a prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/../lib/gcc/aarch64-linux-android/4.9.x-google/../../../../aarch64-linux-android/lib/../lib64/libatomic.a prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/../lib/gcc/aarch64-linux-android/4.9.x-google/libgcc.a -lutils -lcutils -lc++ -ldl -lc -lm -o out/target/product/generic_arm64/obj/EXECUTABLES/hello_intermediates/LINKED/hello -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,--build-id=md5 -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,-maarch64linux -Wl,--hash-style=gnu -Wl,--fix-cortex-a53-843419 -Wl,--allow-shlib-undefined -Wl,--no-undefined out/target/product/generic_arm64/obj/lib/crtend_android.o 檢視編譯結果
模擬器執行試試：
夠狠，不支援。反正只是除錯，不做產品。看看改改連結源程式行不行。
修改bionic/linker/linker.cpp
#if 0
if (elf_hdr->e_type != ET_DYN) {
__libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n");
exit(EXIT_FAILURE);
}
#else
if (elf_hdr->e_type != ET_DYN) {
__libc_format_fd(2, "warnning: only position independent executables (PIE) are supported. Just ignore temporarily.\n");
}
#endif編譯重新執行：
