[Bug binutils/30143] All PE sections are paged

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30143

Nick Clifton <nickc at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |nickc at redhat dot com

--- Comment #1 from Nick Clifton <nickc at redhat dot com> ---
Hi Pali,

  OK, so I am assuming that the desired behaviour is specific to the NT kernel.
  Ie, the default of allowing all sections to be paged is correct for most PE
  binaries, just not the kernel ?

  Given that, there needs to be some way to distinguish between building a
kernel 
  and building a normal binary and the most obvious way is to have a custom 
  linker script for the kernel.  This script can set the
IMAGE_SCN_MEM_NOT_PAGED 
  flag for all sections except one called "PAGE".  Do you agree ?

  So what we need is a way to set PE specific section flags in linker scripts.
  (Which goes against what I said for PR 30145, but I am going through these
  PRs in reverse order and I now see that there is a genuine need to extend
  the linker script syntax).

  The linker currently supports setting a section's type via the "TYPE=xxx" 
  syntax, but that is not quite what we need, since presumably there might
  be a need to set more than one flag.  So I guess that we need to add a
  "FLAG=xxx[|xxx]+" syntax.  Then, since the flags are going to be file 
  format/architecture specific, we need to implement a callback into the
  linker's emulation framework in order to parse the flags, and another one
  to set them.  Plus we need to add support for the NOT_PAGED flag to the 
  BFD library (since it currently does not support it at all).  *sigh* I 
  was right about this being a big potential source for new bugs.

  It would be a lot easier to just use objcopy to set the flag after the
  the link has completed...

  Any thoughts ?

Cheers
  Nick

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