Strip (or replace) Symbols from a Static Library

mmaaxx

Hi,

I'm building a Static Library, using CCS 4.1 and want to strip/replace all symbols, except couple functions. So if somebody unarchives the library and disassembles the object, there are no function names (or junk function names, like: func001, func002, var001, var002, ...).

Is there any simpler then manual way to do this?

PS: Library consists of ~15 objects and there are no way to define everything as static.

Thanks!

over 14 years ago

0 Ki over 14 years ago

TI__Guru**** 464651 points

You can try using 'hide' or 'strip'

http://processors.wiki.ti.com/index.php/Managing_Symbols_with_the_Linker#IP-Protection_-_using_hide_and_unhide_to_remove_symbols_from_codec_libraries

0 mmaaxx over 14 years ago in reply to Ki

Intellectual 280 points

Thanks Ki,

I tried it, it strips/hides symbol information pretty good. But here is a question:

But, here is what I have: library that consists of o1 and o2 object , I stripped/hide all symbols from o1.obj, and all except 1 (that I want to make "public") from o2.obj. Also o2.obj have calls to o1.obj, How the linker (later when building a binary) would know where to link this call (o1.obj got completely stripped)?

It almost looks like I need a tool that will rename all symbols (except couple that I want to share) to some generic names, like func1, func2, var1, var2, etc.

Any ideas?

0 Ki over 14 years ago in reply to mmaaxx

TI__Guru**** 464651 points

mmaaxx,

I'll move this to the Compiler forum, where there is more expertise on this fetaure.

Thanks

0 mmaaxx over 14 years ago in reply to Ki

Intellectual 280 points

Thanks Ki, here is what I end up doing (just want to share a solution if somebody would have same problem):

1. Using nm utility, created a list of symbols in all objects.

2. Manually edited it (removed some "internal" and symbols that I want to keep untouched).

3. Created a script took a file with the list of symbols and created obfuscate.h, that looks like:

#ifdef OBFUSCATE

#define MyRealFunctionName SYM0

#define MyRealFunctionName SYM1

#define MyRealFunctionName SYM2

....

So, when I'm building with OBFUSCATE defined, the preprocessor replaces real, nice symbol names to SYMX.

-Max

Code Composer Studio™︎

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Strip (or replace) Symbols from a Static Library