Is there a tool, given .o file, generating the corresponding .s file in Linux?

[Haizhi Xu]

Dear all:

I am looking for a tool, given .o file, to generate the corresponding .s 
file.

My intension is to convert the .o obj file back into a .s assembly file. 
After doing some 'change' to the assembly file, I need to recompile it back 
to the .o file.

I tried 'objdump', it was ok. But I need to manually copy the screen to a 
file and revise it. Besides, the ".type main, @function" needs to be added 
to the code manually.

So, is there such a convenient tool to generate a .s file directly?

Thanks a lot.
Hai

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