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Index > Windows > Last PE Section Padding

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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
Last PE section does not have to be padded up to IMAGE_NT_HEADERS.FileHeader.FileAlignment. Would FASM rather be able to do this size optimization and not pad up last section (and of course adjust IMAGE_SECTION_HEADER.SizeOfRawData to reflect the change as well)?

Personally (in general), I think somehow such kind of options should be controllable via options, including the new test instruction optimization.

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Post 23 Mar 2004, 00:55
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
privalov still refuses to allow command line options.

Why? They could be optional, so no backward compatibility breaks, and newbies still could use "fasm <source> <destination>".
Post 23 Mar 2004, 19:51
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7739
Location: Kraków, Poland
Tomasz Grysztar
When did I say that I refuse? I plan to implement some switches than don't affect the output code, like the switch for setting the upper limit for memory usage. But all setting that affect the output are in fasm done using the directives in the source.

But you are not right about the section alignment, this is what PE/COFF docs from MS say about the SizeOfRawData field:
Quote:
Size of the section (object file) or size of the initialized data on disk (image files). For executable image, this must be a multiple of FileAlignment from the optional header.


Last edited by Tomasz Grysztar on 23 Mar 2004, 20:10; edited 1 time in total
Post 23 Mar 2004, 20:01
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
Try it out

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Post 23 Mar 2004, 20:43
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
Here is program from FASM\EXAMPLES\HELLO


Description:
Download
Filename: hello.zip
Filesize: 1.09 KB
Downloaded: 160 Time(s)


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Post 23 Mar 2004, 21:41
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
This technique can be achieved using PE realigner program, so not really necessary for FASM to have it. Just bringing to your attention that it is indeed true. Very minor.

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Post 23 Mar 2004, 21:42
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7739
Location: Kraków, Poland
Tomasz Grysztar
We cannot ignore the official specification just because it works.
Post 23 Mar 2004, 21:43
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f0dder



Joined: 19 Feb 2004
Posts: 3170
Location: Denmark
f0dder
I'm with privalov. Things have worked that broke on later windows versions (certain PE aspects, no-import PE's, port I/O, ring0/admin hacks, ...)
Post 23 Mar 2004, 21:47
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
privalov: so where is option to generate only result of preprocessing? It would be very useful and as I know, it is very easy to do (just save some buffer to file and exit)
Post 29 Jul 2004, 18:21
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7739
Location: Kraków, Poland
Tomasz Grysztar
Why are you asking about it in this thread?
Post 29 Jul 2004, 18:35
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