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Index > Compiler Internals > MS COFF uninitialized data

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bitRAKE



Joined: 21 Jul 2003
Posts: 2796
Location: dank orb
bitRAKE
...appears to be broken. I've tried different linkers (MS Link, PoLink). MS Link indicates there are references past the end of the object file. PoLink warns of conflicting flags, and doesn't include the .bss segment in the output EXE. (or, it crashes).

When I manually merge the .bss and .data segments - no errors at all.
So, I must have created initial data in .bss segment? NO:
Code:
      rb 8
State:      rb SBYTES    
does not have any initial data. Nor do other object files. Yet, the segments are tagged differently within the object files.

I haven't tried re-ordering the segments - should that matter?

Is anyone using MS COFF in their projects?
Post 31 Oct 2007, 16:22
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7106
Location: Slovakia
vid
When you are reporting bug, please post FULL source. Otherwise, we can't reproduce the problem.

Quote:
Is anyone using MS COFF in their projects?

Me, no problem sofar
Post 31 Oct 2007, 16:49
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bitRAKE



Joined: 21 Jul 2003
Posts: 2796
Location: dank orb
bitRAKE
vid wrote:
When you are reporting bug, please post FULL source. Otherwise, we can't reproduce the problem.
I will work to refine the source demonstraighting the problem and post here. Also, will do the same for the OBJ that crashes PoLink.
Post 31 Oct 2007, 17:39
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asmfan



Joined: 11 Aug 2006
Posts: 401
Location: Russian
asmfan
I forsee the problem is in DATA flag on uninitialized data section.
Post 31 Oct 2007, 18:16
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bitRAKE



Joined: 21 Jul 2003
Posts: 2796
Location: dank orb
bitRAKE
Here is simple project producing bad exe from polink and only error from mslink. I've included output from builds, but would only have to add paths to batch file to rebuild. (There is an error in MSCOFF.asm, but it isn't the crash of error - just forgot to correct stack after wsprintf.)


Description: MS COFF Errors
Download
Filename: MSCOFF.rar
Filesize: 3.44 KB
Downloaded: 209 Time(s)

Post 31 Oct 2007, 19:03
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7106
Location: Slovakia
vid
asmfan: you was right Wink
Post 31 Oct 2007, 22:38
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bitRAKE



Joined: 21 Jul 2003
Posts: 2796
Location: dank orb
bitRAKE
I've found where FASM sets the high bit on the section flags byte, and tracing it back to maybe find out why some are not set correctly.
Post 01 Nov 2007, 01:59
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7106
Location: Slovakia
vid
bitRAKE: asmfan already found the problem: you used "data" flag on BSS section. Do you suggest "data" should be used on BSS?
Post 01 Nov 2007, 02:18
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bitRAKE



Joined: 21 Jul 2003
Posts: 2796
Location: dank orb
bitRAKE
Okay, the syntax error wasn't clear and the COFF example doesn't have a BSS section nor isit explained in the manual. Thanks (...I'm a little dense on the rebound.)
Post 01 Nov 2007, 03:57
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