Artifact 5611c0d3430339a7266b4bf73ed67500f72f25a47d5d8c840ac00f50832f7b7a:

• File psl-1983/3-1/kernel/20/system-extras.red — part of check-in [eb17ceb7f6] at 2020-04-21 19:40:01 on branch master — Add Reduce 3.0 to the historical section of the archive, and some more
  files relating to version sof PSL from the early 1980s. Thanks are due to
  Paul McJones and Nelson Beebe for these, as well as to all the original
  authors.

  git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@5328 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 1981) [annotate] [blame] [check-ins using] [more...]

%
% 20-EXTRAS.RED - System-specific functions for Dec-20 PSL
% 
% Author:      Eric Benson
%	       Symbolic Computation Group
%              Computer Science Dept.
%              University of Utah
% Date:        4 March 1982
% Copyright (c) 1982 University of Utah
%

%  21-May-83 Mark R. Swanson
%    Made local byte pointer into global byte pointer in DATE; changed 
%    ReturnAddressP to use only low halfword of value in SYMFNC table.
%  <PSL.KERNEL-20>SYSTEM-EXTRAS.RED.3,  5-Jan-83 16:46:34, Edit by PERDUE
%  Added ExitLISP, for the DEC-20 a synonym of QUIT

fluid '(system_list!*);

if_system(Tenex,
    if_system(KL10,
	system_list!* := '(Dec20 PDP10 Tenex KL10),
	system_list!* := '(Dec20 PDP10 Tenex)),
    system_list!* := '(Dec20 PDP10 Tops20 KL10));

lap '((!*entry Quit expr 0)
      (haltf)
      (!*MOVE '"Continued" (reg 1))
      (!*EXIT 0)
);

CopyD('ExitLISP, 'Quit);

lap '((!*entry Date expr 0)
      (!*MOVE (WConst 8) (reg 1))	% allocate a 9 character string
      (!*CALL GtStr)
      (!*MOVE (reg 1) (reg 4))		% save it in 4
      (!*WPLUS2 (reg 1) (WConst 1))
      (tlo 1 8#610000)			% create a byte pointer to it
      (!*MOVE (WConst -1) (reg 2))	% current date
      (hrlzi (reg 3) 2#0000000001)	% ot%ntm, don't output time
      (odtim)
      (!*MOVE (reg 4) (reg 1))
      (!*MKITEM (reg 1) (WConst STR))	% tag it as a string
      (!*EXIT 0)
);

if_system(KL10, NIL,
lap '((!*Entry StackOverflow expr 0)
      (sub (reg ST) (lit (halfword 1000 1000)))	% back up stack
      (!*MOVE '"Stack overflow" (reg 1))
      (!*JCALL StdError)
));

on SysLisp;

syslsp procedure ReturnAddressP X;
begin scalar Y, Z;
    Z := Field(&SymFnc, 18, 18); % don't want any opcode bits in Z
				 % may someday want to use 23 bits, though.
    return Field(X, 0, 18) = 2#011001000000000000	% PC flags
    and Field(@(X - 1), 0, 18) = 8#260740	% pushj 17,
    and (Y := Field(@(X - 1), 18, 18) - Z) > 0 and Y < MaxSymbols
    and MkID Y;
end;

off SysLisp;

END;