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flat assembler > Windows > Recommended section flags for MS COFF

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fasmnewbie



Joined: 01 Mar 2011
Posts: 515
What is the recommended section flags for a statically-linked MS COFF format that works seamlessly in almost all situations?

Code:
section '.text' executable section '.text' readable executable section '.text' code readable executable


For some reasons, certain linkers complain of inconsistent sections configurations. The third line seems to be acceptable by LINK without any warnings. But still, not very sure and haven't tested against other linkers.

Thanks for advises.
Post 25 Jun 2018, 06:56
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donn



Joined: 05 Mar 2010
Posts: 105
Yeah, I've seen the COFF Linker warnings about inconsistent attributes also.

Vid's Mixing assembly with MS Visual C, available in the fasm downloads page, has been very instructive for me and uses your third option:

Code:
section '.text' code readable executable


It also has a data example:

Code:
section '.data' data readable writeable


The example is MS COFF 32, not 64. I would assume a writeable '.text' section is used when the instructions are re-written. I've been self-modifying instructions quite heavily lately but don't remember seeing problems without this flag. I have the writeable flag included now, though, along with align 16.

The MS COFF specs have a lot details such as flag binary values and say the number of sections can be variable though the loader limits the section count to 96.

A similar fasm thread that goes a little deeper here.
Post 26 Jun 2018, 04:58
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fasmnewbie



Joined: 01 Mar 2011
Posts: 515
Thanks for the clarifications and links, donn.

Seems that the safest option for me (for now) is to use full similar section flags as the PE (the third one), since IMO, most MS services (kernel, msvcrt) use similar section control flags.
Post 26 Jun 2018, 06:18
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