如何让gcc只生成可以直接加载到内存并执行的机器码? [英] How to make gcc generate only machine code that can be loaded directly into memory and executed?

问题描述

我想生成一个可以加载到内存中的文件(例如使用 mmap)，然后跳转到该内存的开头运行代码.

I would like to produce a file that I can load into memory (for example with mmap) and then jump to the start of that memory to run the code.

理想情况下，我希望选择使代码可重定位(这可能效率低下)或指定代码期望加载的显式地址(这很痛苦)，但任何一个都可能工作正常靠自己.

Ideally, I'd like the option of either making the code relocatable (which might be inefficient) or specifying an explicit address that the code expects to be loaded at (which is a pain), but either one would probably work fine on its own.

推荐答案

你可以这样做，但你需要通过目标文件格式.特别是，objcopy 命令可以将可执行文件转换为平面"二进制文件(取决于您的目标平台).也许是这样的:

You can do this but you will need to go through the object file format. In particular, the objcopy command can transform an executable file to a "flat" binary file (depending on your target platform). Perhaps something like this:

gcc -o test test.c
objcopy -O binary test test.bin

有关详细信息，请参阅您平台上的 man objcopy.

See man objcopy on your platform for more details.

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