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From: Marcel Moolenaar <marcel@FreeBSD.org>
Date: Sat, 14 May 2011 14:55:15 +0000 (UTC)
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Subject: cvs commit: src/sys/ia64/ia64 syscall.S
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marcel      2011-05-14 14:55:15 UTC

  FreeBSD src repository

  Modified files:
    sys/ia64/ia64        syscall.S 
  Log:
  SVN rev 221894 on 2011-05-14 14:55:15Z by marcel
  
  Prefer switching the memory stack from user to kernel *before* switching
  the register stack. While the ordering doesn't matter, it creates an
  invariant not previously there: the memory stack pointer will always be
  larger than the register stack pointer. With this invariant in place,
  it's easier to add instrumentation code that detects a stack overflow
  because in such a scenario the memory stack pointer and register stack
  pointers have crossed each other.
  
  Aside: basic kernel operation needs about half the stack size (~16K)
  at most. We have plenty of head room on the kernel stack...
  
  Revision  Changes    Path
  1.17      +4 -3      src/sys/ia64/ia64/syscall.S