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Index > Compiler Internals > MS COFF characteristics

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SFeLi



Joined: 03 Nov 2004
Posts: 140
SFeLi
In MS COFF output files fasm sets IMAGE_FILE_HEADER.Characteristics to 0x00000184 (IMAGE_FILE_32BIT_MACHINE or IMAGE_FILE_BYTES_REVERSED_LO or IMAGE_FILE_LINE_NUMS_STRIPPED). Is this correct?

  • Specification deprecates IMAGE_FILE_BYTES_REVERSED_LO and IMAGE_FILE_LINE_NUMS_STRIPPED and says both of them should be 0
  • Microsoft C Compiler (from MSVS 6.0) doesn’t even set IMAGE_FILE_32BIT_MACHINE (IMAGE_FILE_HEADER.Machine = IMAGE_FILE_MACHINE_I386 implies this, doesn’t it?)
  • Pelles C sets only IMAGE_FILE_32BIT_MACHINE

What about the other compilers and assemblers? Which combination of characteristics is correct? Shouldn’t fasm set only IMAGE_FILE_32BIT_MACHINE or even 0?
Post 19 Oct 2009, 13:41
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SFeLi



Joined: 03 Nov 2004
Posts: 140
SFeLi
No ideas?
Post 02 Nov 2009, 16:35
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
If the specification says they are deprecated, FASM IMO shouldn't set them, even though it isn't such a big deal. Let's wait for tomasz's attention.
Post 02 Nov 2009, 22:23
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asmfan



Joined: 11 Aug 2006
Posts: 392
Location: Russian
asmfan
Waiting FASM to allow these in future:
DllCharacteristics
IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE - however dunno why this should/can be set instead of IMAGE_FILE_RELOCS_STRIPPED flag
IMAGE_DLL_CHARACTERISTICS_NX_COMPAT - for native DEP support by image
Post 03 Nov 2009, 12:42
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rugxulo



Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)
rugxulo
vid, everything is deprecated, esp. when the original programmers are nowhere to be found! So I wouldn't worry too much about that. (Besides, even standard COFF used by DJGPP differs in many ways, so there is no agreed upon settings anyways.)
Post 03 Nov 2009, 23:04
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7797
Location: Kraków, Poland
Tomasz Grysztar
Nevertheless, fasm generated the standard COFF only when "format COFF" is specified, while "format MS COFF" should conform to Microsoft specification.
Therefore this should be fixed - please wait for the next release.
Post 03 Nov 2009, 23:14
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