132 lines
2.7 KiB
Plaintext
132 lines
2.7 KiB
Plaintext
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#
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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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pro $topsize, 2*EM_WSIZE+4*EM_PSIZE
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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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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_PSIZE ; stack-break-SP
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ret EM_PSIZE ; return size of block to be saved
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end 2*EM_WSIZE+4*EM_PSIZE
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exp $topsave
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pro $topsave, 0
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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_PSIZE
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loc EM_PSIZE
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adu EM_PSIZE ; gives size
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dup EM_PSIZE
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lal 0
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sti EM_PSIZE ; 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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lal 0 ; size
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loi EM_PSIZE
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bls EM_PSIZE ; move whole block
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asp 4*EM_PSIZE+2*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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pro $topload, 0
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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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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 dinamic 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 -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 ; destimation 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_PSIZE ; size of block
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bls EM_PSIZE ; move block back (SP becomes the SP AFTER again,
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; because of the asp -EM_PSIZE!)
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asp 2*EM_PSIZE ; 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 ; return 0
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end 0
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