基于Android arm64 可执行程序的编译运行

Android默认编译的应用程序动态链接的一般都是PIE，前文“基于Android arm64 Linux got 调试”，每次调试都要查看加载地址，于是就想能否编译生成非PIE的应用程序。

/opt/android-6.0.1_r9/external/hello$ mmm ./ showcommands 2>&1 | tee build.log

查看build.log

prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-g++ -pie -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 

果然有-pie参数。在android编译根路径输入去除-pie参数的命令：

/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 

查看编译结果

模拟器运行试试：

够狠，不支持。反正只是调试，不做产品。看看改改链接源程序行不行。

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

编译重新运行：