openbios/openboot/obp/cpu/sparc/doccall.fth

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• Hash : 1a08f436
  Author :
  Date : 2010-08-25T09:23:17
  

  change to well-formed svn directory structure. git-svn-id: svn://coreboot.org/openboot/trunk@2 4486e004-3823-0410-90c7-fb508cc143bb

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• obp/cpu/sparc/doccall.fth

• \ doccall.fth 2.4 94/08/13
  \ Copyright 1985-1990 Bradley Forthware
  
  \ Shared code for ccall interface.  This file is used in conjunction with
  \ ccall.fth.  The 2 files are separate because the code in this file must
  \ be resident, while the code in ccall.fth can be transient.
  \
  \ do-ccall is a shared subroutine which is called from code generated by
  \ "ccall".  The calling sequence looks like:
  \
  \     <code to transfer arguments from the stack to registers>
  \     sethi  %hi(c_entry_point), %l0
  \     call   do-ccall
  \     or     %l0, %lo(c_entry_point), %l0
  \     <code to push results, if any, on the stack>
  
  label do-ccall		\ Subroutine address in %l0, return address in %o7
  
     sp   'user saved-sp   nput	\ Save for callbacks
     rp   'user saved-rp   nput	\ Save for callbacks
  
     %o7    %l1  move		\ Exchange %l0 and %o7
     %l0    %o7  move
     %l1    %l0  move
  
     \ Save the globals in case C changes them
     %g1    %l1  move
     %g2    %l2  move
     %g3    %l3  move
     %g4    %l4  move
     %g5    %l5  move
     %g6    %l6  move
     %o7 0  %o7  jmpl
     %g7    %l7  move	\ Delay slot
  
     \ Restore the globals
     %l1    %g1  move
     %l2    %g2  move
     %l3    %g3  move
     %l4    %g4  move
     %l5    %g5  move
     %l6    %g6  move
     %l0 8  %g0  jmpl	\ Return
     %l7    %g7  move
  end-code
  

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