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;  spi3.asm: STACK PROBE
;
;  $Id: //info.ravenbrook.com/project/mps/branch/2002-05-22/open-source-prep/code/spi3.asm#4 $
;  Copyright (c) 2001 Ravenbrook Limited.  See end of file for license.
;
;  This function reads a location that is probeDepth words beyond
;  the current stack pointer.  On intel platforms the stack grows
;  downwards so this means reading from a location with a lesser address.
;
;  The registers edi, esi, ebx are the registers defined to be preserved
;  across function calls, so we do not use those.

.386
.model flat
.code

_StackProbe proc public ; (Size probeDepth)
  push ebp              ; frame pointer
  mov  ebp,esp
  mov  eax, [ebp+08]
  neg  eax
  mov  eax, [esp+eax*4]   ; do the actual probe
  leave
  ret                   ; return
_StackProbe endp

end

; C. COPYRIGHT AND LICENSE
;
; Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
; All rights reserved.  This is an open source license.  Contact
; Ravenbrook for commercial licensing options.
; 
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions are
; met:
; 
; 1. Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; 
; 2. Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; 
; 3. Redistributions in any form must be accompanied by information on how
; to obtain complete source code for this software and any accompanying
; software that uses this software.  The source code must either be
; included in the distribution or be available for no more than the cost
; of distribution plus a nominal fee, and must be freely redistributable
; under reasonable conditions.  For an executable file, complete source
; code means the source code for all modules it contains. It does not
; include source code for modules or files that typically accompany the
; major components of the operating system on which the executable file
; runs.
; 
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
; IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
; TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
; PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
; COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
; USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
; ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.