/* Sun-$Revision: 30.3 $ */

Copyright 1992-2001 Sun Microsystems, Inc. and Stanford University.
See the LICENSE file for license information.

Sparc Format of Self & C Stack/Registers:

    argn		    ; args past the 5th are pushed on the stack
    ...
    arg7
    arg6
    in registers	    ; space to dump I0-I5 (if this frame was a C frame)
    hidden parameter word   ; hidden parameter (if this frame was a C frame)
    caller I7		    ; caller's saved register window
    ...
FP: caller L0
    link		    ; stack frame nmethod link word
    currentPC		    ; current PC (valid only for frame with
			    ; invalid nmethod)
    unused		    ; unused (SP must be doubleword-aligned)
    temp1		    ; this frame's temporary stack locations
    temp2
    ...
    tempn
    callee argn		    ; space for callee's args past the 5th
    ...
    callee arg7
    callee arg6
    callee in registers	    ; space for callee to dump I0-I5 registers
    callee hidden parameter ; space for callee's hidden parameter word
      ; register window on stack
    I7: return pc	    ; return address for this frame
    I6: FP	    	    ; pointer to top of this frame
    I5: arg5		    ; first 5 arguments in registers
    I4: arg4
    I3: arg3
    I2: arg2
    I1: arg1
    I0: receiver[/parent]   ; receiver (and parent block in old compiler)
    L7:
    L6:
    L5:
    L4:
    L3:
    L2:
    L1:
SP: L0:


68000 Format of Self & C stack:

    argn		    ; args pushed on right to left; receiver in D0
    ...
    arg2
    arg1
    return pc		    ; then call the callee
FP: frame		    ; do a LINK
    link		    ; stack frame nmethod link word
    currentPC		    ; current PC (valid only for frame with
			    ; invalid nmethod)
    unused		    ; unused (to reduce differences with sparc version)
    temp1[parent]	    ; callee's temps (parent block in old compiler)
    ...
    tempn
    registers		    ; saved registers (subset of D2-D7, A2-A5)
    callee argn		    ; outgoing arguments
    ...			    ; (stack frame always has same size)
    callee arg2
    callee arg1