Tortall yasm

Comments and changes to this ticket

• 

  Peter Johnson September 27th, 2014 @ 03:53 AM

  • State changed from “new” to “open”

  This is an interesting issue, as the various PE and COFF docs disagree on the handling of the "physical address" field in the section header, which seems to cause the objdump -h output you're seeing. It may well be that the GNU tools (in particular the linker) have a different interpretation than the Microsoft tools. Yasm sets the section size field correctly, but the GNU tools ignore it and prefer the physical address field for BSS sections.

  According to http://msdn.microsoft.com/en-us/library/ms809762.aspx, the "physical address" in the section header has different meanings for EXE and OBJ files. In EXE files, it contains the rounded up size of the section, but in OBJ files it instead actually indicates the "physical address" of the section (e.g. the start of the section relative to other sections in the OBJ file).

  Other references say to always set this field to 0 in OBJ files.

  Yasm currently follows the Microsoft specification for OBJ files, and thus sets the physical address field to non-zero. Unfortunately, it appears the GNU tools always treat their input files as EXE files, so when the "physical address" field is nonzero, they prefer it over the section size header field.

  The fix appears to be for Yasm to set the physical address field to 0. I'll commit a change to this effect but extensive testing will be required to make sure it doesn't break the Microsoft tool use cases before I roll a release with the change.

• 

  Peter Johnson September 27th, 2014 @ 04:23 AM

  • State changed from “open” to “resolved”

  Fix committed: https://github.com/yasm/yasm/commit/1910e914792399137dec0b047c59965...

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  ray.seyfarth September 27th, 2014 @ 02:07 PM

  I have downloaded the latest yasm and this fix does solve my problem with using the bss segment. Thanks for the prompt action.

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  manisha April 5th, 2018 @ 11:10 AM

  There is a problem with the .bss segment under Windows. I was using version 1.2.0 so I downloaded yasm version 1.3.0 and the problem exists there.I have just upgraded to windows 10. I had already installed SoundWeb designer 1.50 and was working fine on windows 7. After updating to windows 10 I cannot get Soundweb Designer to find any soundweb for my site book flight tickets using http://www-googleflights.com/ and search flight tickets using "Google Flights" anyone plz tell me how to fix the issue BSS Problem with Windows 10.