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\ Hypervisor Software File: hfcodes.fth
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id: @(#)hfcodes.fth 1.2 06/10/11
purpose: Implementation of  Hypervisor API "htrap"
copyright: Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved
copyright: Use is subject to license terms.

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5 constant max-#outs
5 constant max-#ins

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code (htrap) ( [arg0 ... arg4] func# trap# -- [ret4 ... ret0] )
   max-#ins 1+  0 do		\ 5 args, one fun#, and trap# on stack
      sp %o5 i - pop		\ load them into the o's
   loop
   %g0 tos always trapif	\ trap# is located in 'tos'
   %o4 sp push			\ return value 3
   %o3 sp push			\ return value 2
   %o2 sp push			\ return value 1
   %o1 sp push			\ return value 0
   %o0 tos move			\ put 'status' on top of stack
c;

: htrap ( [arg0 ... arg4] #in #out func# trap# -- [ret4 ... ret0] )
   rot >r 2>r			( ??? #in )( R: #out trap# fun# )
   max-#ins swap - 0 ?do 0 loop	( arg0 ... arg4 )( R: #out trap# fun# )
   2r> (htrap)			( ret4 ret3 ret2 ret1 ret0 ) ( r: #out )

   max-#outs r@ - 0 ?do max-#outs 1- roll loop  ( ??? ret0 ?? )
   max-#outs r> - 0 ?do drop loop 		( ??? ret0 ) 
;

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