如何确定Android .so文件(即armeabi或armeabi-v7a)的ABI? [英] How to determine ABI of Android .so file (i.e. armeabi or armeabi-v7a)?

问题描述

我有一个第三方供应商提供的.so文件，该文件将包含在我的Android应用程序中.我无权访问源代码，也不能(轻松地)与供应商联系.

I have a .so file provided by a third-party vendor that is to be included in my Android application. I do not have access to the source code nor can I (easily) contact the vendor.

我是否可以通过检查.so文件来确定它是否针对 armeabi 或 armeabi-v7a ABI进行编译?

Is there a way for me to figure out by examining the .so file whether or not it was compiled targeting the armeabi or armeabi-v7a ABI?

我问的原因有两个.首先，我更喜欢针对armeabi-v7a ABI进行编译，以实现比armeabi更高的性能.知道这一点将使我有信心获得最佳性能.另外，我想命名.so文件所在的目录(即，将文件夹"armeabi"或"armeabi-v7a"命名为与它针对的ABI相对应).

I'm asking for two reasons. First, I prefer for it to have been compiled targeting the armeabi-v7a ABI to get the improved performance compared to armeabi; knowing this will give me confidence that I'm getting the best possible performance. Also, I would like to name the directory in which the .so files live appropriately (i.e. name the folder "armeabi" or "armeabi-v7a" corresponding to the ABI that it was compiled targeting).

推荐答案

我最终使用Android NDK中的arm-linux-androideabi-objdump程序反汇编了.so文件.在反汇编的代码中，我找到了vmaxnm.f32指令，该指令存在于armeabi-v7a指令集中，而在 not 中却没有.基于此，我得出结论，.so是针对armeabi-v7a编译的.我可能还应该寻找其他指令，但是我对ARM指令集一点都不熟悉.我很幸运，这一操作相当明显(因为这是浮点运算，这是armeabi和armeabi-v7a之间的主要区别之一).感谢发布者的想法.

I ended up disassembling the .so files using the arm-linux-androideabi-objdump program from the Android NDK. In the disassembled code I found the vmaxnm.f32 instruction, which is present in the armeabi-v7a instruction set but not in armeabi. Based on that I concluded that the .so was compiled targeting armeabi-v7a. There are probably other instructions that I could have looked for but I'm not at all familiar with the ARM instruction set to be able to tell. I got lucky that this one was fairly obvious (being that it is a floating point operation, one of the major differences between armeabi and armeabi-v7a). Thanks for the ideas to those who posted.

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