175 lines
3.3 KiB
Text
175 lines
3.3 KiB
Text
#
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;
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; (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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; See the copyright notice in the ACK home directory, in the file "Copyright".
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;
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;
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; Module: coroutine primitives
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; Author: Kees Bot, Edwin Scheffer, Ceriel Jacobs
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; Version: $Header$
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;
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mes 2,_EM_WSIZE,_EM_PSIZE
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; topsize takes care of two things:
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; - given a stack-break,
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; it computes the size of the chunk of memory needed to save the stack;
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; - also, if this stack-break = 0, it creates one, assuming that caller is
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; the stack-break.
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;
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; This implementation assumes a continuous stack growing downwards
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exp $topsize
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#ifdef __sparc
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inp $topsize2
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pro $topsize, 0
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mes 11
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zer _EM_PSIZE
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lal 0
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loi _EM_PSIZE
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cal $topsize2
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asp 2*_EM_PSIZE
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lfr _EM_WSIZE
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ret _EM_WSIZE
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end 0
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pro $topsize2, (3*_EM_WSIZE+3*_EM_PSIZE)
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#else
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pro $topsize, (3*_EM_WSIZE+3*_EM_PSIZE)
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#endif
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; local space for line-number, ignoremask, filename, stack-break, size,
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; and stack-pointer (see the topsave routine)
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mes 11
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lal 0
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loi _EM_PSIZE
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loi _EM_PSIZE ; stack-break or 0
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zer _EM_PSIZE
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cmp
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zne *1
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lxl 0
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dch ; local base of caller
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#ifdef __sparc
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dch ; because of the extra layer
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#endif
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lal 0
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loi _EM_PSIZE
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sti _EM_PSIZE
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1
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lal 0
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loi _EM_PSIZE
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loi _EM_PSIZE
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lpb ; convert this local base to an argument base.
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; An implementation of a sort of "topsize" EM
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; instruction should take a local base, and save
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; the whole frame.
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lor 1 ; stack-break SP
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sbs _EM_WSIZE ; stack-break-SP
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ret _EM_WSIZE ; return size of block to be saved
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end 3*_EM_WSIZE+3*_EM_PSIZE
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exp $topsave
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#ifdef __sparc
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inp $topsave2
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pro $topsave,0
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mes 11
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lal 0
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loi 2*_EM_PSIZE
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cal $topsave2
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asp 2*_EM_PSIZE
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lfr _EM_WSIZE
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ret _EM_WSIZE
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end 0
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pro $topsave2,0
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#else
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pro $topsave, 0
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#endif
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mes 11
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loe 0
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lae 4 ; load line number and file name
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loi _EM_PSIZE
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lim ; ignore mask
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lor 0 ; LB
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lal 0
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loi _EM_PSIZE ; stack-break
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lpb
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lor 1
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sbs _EM_WSIZE
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loc _EM_WSIZE
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adu _EM_WSIZE ; gives size
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dup _EM_WSIZE
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stl 0 ; save size
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lor 1 ; SP (the SP BEFORE pushing)
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lor 1 ; SP (address of stack top to save)
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lal _EM_PSIZE ; area
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loi _EM_PSIZE
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lol 0 ; size
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bls _EM_WSIZE ; move whole block
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asp 3*_EM_PSIZE+3*_EM_WSIZE ; remove the lot from the stack
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loc 1
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ret _EM_WSIZE ; return 1
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end 0
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sv
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bss _EM_PSIZE,0,0
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exp $topload
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#ifdef __sparc
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inp $topload1
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pro $topload,0
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lal 0
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loi _EM_PSIZE
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cal $topload1
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asp _EM_PSIZE
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lfr _EM_WSIZE
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ret _EM_WSIZE
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end 0
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pro $topload1, 0
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#else
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pro $topload, 0
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#endif
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mes 11
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lal 0
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loi _EM_PSIZE
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lae sv
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sti _EM_PSIZE ; saved parameter
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lxl 0
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2
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dup _EM_PSIZE
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adp -3*_EM_PSIZE
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lal 0
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loi _EM_PSIZE ; compare target SP with current LB to see if we must
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loi _EM_PSIZE
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cmp ; find another LB first
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zgt *1
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dch ; just follow dynamic chain to make sure we find
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; a legal one
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bra *2
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1
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str 0
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lae sv
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loi _EM_PSIZE
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loi _EM_PSIZE ; load indirect to
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str 1 ; restore SP
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asp 0-_EM_PSIZE ; to stop int from complaining about non-existent memory
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lae sv
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loi _EM_PSIZE ; source address
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lor 1
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adp _EM_PSIZE ; destination address
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lae sv
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loi _EM_PSIZE
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adp _EM_PSIZE
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loi _EM_WSIZE ; size of block
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bls _EM_WSIZE
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asp _EM_PSIZE+_EM_WSIZE ; drop size + SP
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str 0 ; restore local base
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sim ; ignore mask
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lae 4
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sti _EM_PSIZE
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ste 0 ; line and file
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loc 0
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ret _EM_WSIZE
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end 0
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