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Date:      Sun, 3 Mar 2002 21:07:23 -0800 (PST)
From:      Jake Burkholder <jake@FreeBSD.org>
To:        cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   cvs commit: src/sys/sparc64/sparc64 vm_machdep.c
Message-ID:  <200203040507.g2457Nm52814@freefall.freebsd.org>

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jake        2002/03/03 21:07:23 PST

  Modified files:
    sys/sparc64/sparc64  vm_machdep.c 
  Log:
  Fix obscure problems with vfork where part of the parent's stack could be
  clobbered by the child.  This is more complicated than usual because the
  window that could get clobbered is pushed in kernel mode, so a lot of
  registers would have to be saved in other registers in userland and we
  don't have enough.  What we do have is space in the pcb to temporarily
  store user windows that were spilled in kernel mode, but could not be
  immediately stored to the user stack.  So we copy in the parent's topmost
  window and save it in the pcb, and arrange for it to be copied back out
  when the child is done frobbing the stack.
  
  Reviewed by:    tmm
  
  Revision  Changes    Path
  1.21      +40 -8     src/sys/sparc64/sparc64/vm_machdep.c

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