/* lisp stack header format */
/* Last modified 7/21/72 by Reed for in_pl1 flag */
/* Modified 1978 by Greenberg for unwind-protect ops */

declare

     1 stack_seg based aligned,		/* stored in base of unmkd_pdl segment */
       2 marked_stack_bottom ptr,		/* where marked stack begins... */
       2 unmkd_stack_bottom ptr,		/* where unmkd_ stack actually starts */
       2 stack_ptr_ptr ptr,			/* points at lisp_static_vars_$stack_ptr */
       2 unmkd_ptr_ptr ptr,			/* points at lisp_static_vars_$unmkd_ptr's offset word */
       2 array_pointer ptr,			/* obsolete */
       2 nil fixed bin(71),			/* object for nil */
       2 true fixed bin(71),			/* object for t */
       2 in_pl1_code bit(36),			/* flag indicating that we are in pl1 code if non-zero */
       2 padding0 bit(36),			/* double word boundary preservation */
       2 bind_op ptr,			/* pointers to operators for run-time support */
       2 unbind_op ptr,
       2 errset1_op ptr,
       2 errset2_op ptr,
       2 unerrset_op ptr,
       2 call_op ptr,
       2 catch1_op ptr,
       2 catch2_op ptr,
       2 uncatch_op ptr,
        2 gensym_data (2) bit(36) aligned,	/* stuff used by the gensym function */
       2 system_lp ptr,			/* pointer to the system's linkage section */
       2 iogbind_op ptr,
       2 unseen_go_tag_op ptr,
       2 throw1_op ptr,
       2 throw2_op ptr,
       2 signp_op ptr,
       2 type_fields bit(72) aligned,		/* fixnum, flonum type for compiled code */
       2 return_op ptr,
       2 err_op ptr,
       2 pl1_interface ptr,			/* pointer to pl1 interface for type 2 subrs. */
       2 pl1_lsubr_interface ptr,		/* same for type -2 subrs */
       2 cons_opr ptr,			/* cons operator */
       2 ncons_opr ptr,			/* ncons operator */
       2 xcons_opr ptr,			/* xcons operator */
       2 begin_list_opr ptr,			/* operator to make initial cell of list */
       2 append_list_opr ptr,			/* operator to append to last-made cell of list */
       2 terminate_list_opr ptr,		/* opeator to append last cell to next to last cell of list */
       2 compare_op ptr,			/* fixnum/flonum comparison operator */
       2 link_op ptr,
       2 array_operator pointer,		/* accessing operator, invoked by arrays */
       2 dead_array_operator pointer,		/* dead arrays invoke this operator instead */
       2 store_operator pointer,		/* operator to do compiled store */
       2 floating_store_operator pointer,	/* ditto, but operand is in EAQ */
       2 array_info_for_store pointer,		/* -> array_info block of last array referenced */
       2 array_offset_for_store fixed bin(18),	/* offset in array_data block of last array element referenced */
       2 padding bit(36),
       2 array_link_snap_opr pointer,
       2 create_string_desc_op ptr,
       2 create_array_desc_op ptr,
       2 pl1_call_op ptr,
       2 cons_string_op ptr,
       2 create_varying_string_op ptr,
       2 unwp1_op ptr,
       2 unwp2_op ptr,
       2 ununwp_op ptr,
       2 irest_return_op ptr,
       2 pl1_call_nopop_op ptr,
       2 rcv_char_star_op ptr,
       2 spare2 (7) ptr,
       2 begin_unmkd_stack(16325) fixed bin(71);	/* rest of segment is the unmarked pdl */

dcl call_array_operator bit(36) static init("100112273120"b3),	/* tspbb ab|112,* */
    call_dead_array_operator bit(36) static init("100114273120"b3);	/* tspbb ab|114,* */

/* end stack segment format */


*/
                                          -----------------------------------------------------------


Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group Bull including Bull HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell Bull Inc., Groupe Bull
and Bull HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for 
managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

                                          -----------------------------------------------------------

Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, Bull or Bull HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by Bull HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved

*/