Improve decompilation of object files

[PeterMatula]

Right now, we have problems with decompilation of object files. Here are a few binaries, that we could use to identify problems, and use them in regression tests once the problems are fixed: bins.zip.

[metthal]

The problem mainly lies in the fact that imported symbols have their address set to 0. Example from x86:

0x62:   c7 04 24 b8 00 00 00   mov dword [ esp ], 0xb8 ; "Hello World!" 
0x69:   e8 00 00 00 00         call 0x6e <function_6e> ; Address of function: _foo

You can see that CALL instruction with operand 0. This 0 is intermediate value and can be fixed with relocations if we assign some virtual fake address to symbol foo. It would be the best to create one additional segment in loader and pair addresses from this segment with symbols.

Here, I attach some files from our internal bug tracker which I made.

hello.zip

[PeterMatula]

#577 solved problems with ELF object files. Tests added in avast/retdec-regression-tests@9f0af1b. COFF object files are still not OK.