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	UNIVERS	DCN
	SUBTTL	Macros for DECnet CUSPS
	SEARCH	JOBDAT,UUOSYM,MACTEN,SWIL

F=:0				;Flag register
T4=:1+<T3=:1+<T2=:1+<T1=:1+F>>>	;Temporary ACs
P4=:1+<P3=:1+<P2=:1+<P1=:1+T4>>>;Permanent ACs
S4=:1+<S3=:1+<S2=:1+<S1=:1+P4>>>;Saved ACs
E=:S4+1				;Opcode of LUUO. Used by dispatch routine.
U=:E+1				;LUUO itself.
P=:17				;Push down list pointer

C==1+<N==P3>			;SCAN acs

OPDEF	CALL	[PUSHJ	P,]	;instruction used to call all routines in here
OPDEF	RET	[POPJ	P,]	;Bad return
OPDEF	RETSKP	[JRST	.POPJ1##] ;good return from most routines
OPDEF	SKP	[TRNA]		;skip over an instruction
OPDEF	NOOP	[TRN]		;do nothing. Ignore skip returns
OPDEF	XMOVEI	[SETMI]		;get full 30 bit immediate address
OPDEF	XHLLI	[HLLI]		;get section number in left half
OPDEF	IFIW	[1B0]		;Instruction formatted indirect word

DEFINE	$HISEG,<IFL $$.SEG,<$$.LOW==.
		RELOC	$$.HGH
		$$.SEG==1>>

DEFINE	$LOSEG,<IFG $$.SEG,<$$.HGH==.
		RELOC	$$.LOW
		$$.SEG==-1>>

	SUBTTL	Storage allocation macros

DEFINE	$BLOCK(LABEL,SIZE),<
$LOSEG
LABEL:	BLOCK	SIZE
$HISEG
>

DEFINE	$LVAR(LABEL),<
$LOSEG
LABEL:	BLOCK	1
$HISEG
>

DEFINE	$GVAR(LABEL),<
$LOSEG
LABEL::	BLOCK	1
$HISEG
>

DEFINE	$ABS(LOCATION,VALUE,LABEL),<
$$.ABS==$$.SEG
IFG $$.ABS,<$LOSEG>
IFL $$.ABS,<$HISEG>
LOC	<LOCATION>
IFNB <LABEL>,<LABEL:>
	VALUE
IFG $$.ABS,<$HISEG>
IFL $$.ABS,<$LOWSG>
>

DEFINE	$STACK,<
IFNDEF PDLSIZ,<PDLSIZ==100>
$BLOCK	STACK,PDLSIZ
PDL:	IOWD	PDLSIZ,STACK	;For move p,pdl
>

	SUBTTL	Error definition macros

DEFINE	$DIE(PFX,ARG),<
DIE.	(SIXBIT /PFX/)
>

DEFINE	$ERROR(PFX,TXT,RTN,INSTR,DIE),<
$ERRMC ERROR,PFX,<TXT>,<RTN>,<INSTR>,<DIE>
> ;;END $ERROR MACRO

DEFINE	$WARN(PFX,TXT,RTN,INSTR,DIE),<
$ERRMC WARN,PFX,<TXT>,<RTN>,<INSTR>,<DIE>
> ;END $WARN MACRO

DEFINE	$INFOR(PFX,TXT,RTN,INSTR,DIE),<
$ERRMC INFOR,PFX,<TXT>,<RTN>,<INSTR>,<DIE>
>

DEFINE	$ERDFA(INSTR),<
ZZZINS==0
IFNB <INSTR>,<ZZZINS==-1
 .IF <INSTR>,ABSOLUTE,<
  IFN <777000000000&<INSTR>>,<ZZZINS==1>
  IFE <LH.ALF&INSTR>,<
   IFGE <INSTR-E>,<
    IFLE <INSTR-P>,<
     ZZZINS==0
    >
   >
  >
 >
>
IFL <ZZZINS>,<MOVE T1,INSTR>
IFE <ZZZINS>,<MOVE T1,INSTR-E-7(P)>
IFG <ZZZINS>,<INSTR>
>

DEFINE	$ERDFC(RTN),<
ZZZRTN==CALL
IFNB <RTN>,<
 .IFN <RTN>,EXTERNAL,<
  IFN <<RTN>&777000000000>,<
   ZZZRTN==0
  >
 >
>
ZZZRTN+RTN
PURGE ZZZRTN
>

	SUBTTL	Low-level error macro definition

DEFINE	$ERRMC(OPC,PFX,TXT,RTN,INSTR,DIE),<
E..'PFX:!
IFNB \RTN\,<IFNB \DIE\,<OPC'% 3+[XWD 0,DIE>
	IFB \DIE\,<OPC'$ 2+[>
	$ERDFA <INSTR>
	$ERDFC <RTN>>
IFB \RTN\,<IFNB \DIE\,<OPC'. 1+[XWD 0,DIE>
	IFB \DIE\,<OPC [>>
E$$'PFX:EPFX$$!(SIXBIT \PFX\)
	ASCIZ\TXT\]
> ;End of $ERRMC macro

DEFINE $PROMPT(AC,SYMBOL,TEXT,KEYWORDS),<
IFG <SYMBOL-PRSMAX>,<PRINTX ?Bad symbol for PROMPT macro SYMBOL
		PASS2>
IFNB <KEYWORDS>,<IFN <SYMBOL-%KEYWR>,<IFG <SYMBOL-%CHARA>,<
		PRINTX ?Cannot give 4th argument "KEYWORDS" here.
		PASS2>>>
	PRMPT.	AC,1+[XWD SYMBOL,KEYWORDS
		ASCIZ \TEXT\]
>

	SUBTTL	$EXTERN - Set up the correct external references


XP I.LUO,1B0
XP I.FLE,1B2
XP I.PRM,1B3
XP I.CHG,1B6
XP I.GTT,1B7
XP I.SAV,1B12
XP E.SYM,1B35	;Note, inverse significance of bit

DEFINE	$EXTERN,<
IFNDEF $ONLY,<$ONLY=<XWD -1,0>>
IFN <$ONLY&I.LUO>,<
	EXTERN DN.E0
	EXTERN LUUO$
	EXTERN EREXIT
	>
IFE <$ONLY&I.LUO>,<
	PFHINI==:.POPJ##
	USRTRP==:0
	$HISEG
LUUOX::	ADJSP P,-1
	POPJ P,
EREXIT:	HALT .
	>
IFN <$ONLY&I.FLE>,<EXTERN DN.E2>
IFE <$ONLY&I.FLE>,<
	FLERR$==:EREXIT
	LERR$==:EREXIT
	>
IFN <$ONLY&I.PRM>,<EXTERN WHERAC,DN.E3>
IFE <$ONLY&I.PRM>,<
	PRMPT$==:EREXIT
	ISCAN$==:EREXIT
	QSCAN$==:EREXIT
	PSCAN$==:EREXIT
	VSCAN$==:EREXIT
	REEAT$==:EREXIT
	$HISEG
.PPMFD::XWD 1,1		;;Keep RDH's SCAN happy
	>
IFN <$ONLY&I.CHG>,<EXTERN ORGPPN,DN.E6>
IFE <$ONLY&I.CHG>,<
	CHPPN$==:EREXIT
	GOD$==:EREXIT
	UNGOD$==:EREXIT
	>
IFN <$ONLY&I.GTT>,<EXTERN DN.E7>
IFE <$ONLY&I.GTT>,<
	GTTAB$==:EREXIT
	>
IFE <$ONLY&E.SYM>,<
	.TEXT	"/SYMSEG:HIGH/LOCALS "
>
>

	SUBTTL	Prompting and parsing definitions
	DEFINE	INPUTS,<
PARSE	%CHARR,<CALL .TIALT##>,<CALL .CHARH>,<MOVE T1,C>
PARSE	%CHARA,<CALL .TIALT##>,<CALL .CHARH>,<MOVE T1,C>
PARSE	%SIXBI,<CALL .SIXSW##>,<OUTSTR [ASCIZ\Sixbit word\]>,<MOVE T1,N>
PARSE	%OCTAL,<CALL .OCTNW##>,<OUTSTR [ASCIZ\Octal number\]>,<MOVE T1,N>
PARSE	%DECIM,<CALL .DECNW##>,<OUTSTR [ASCIZ\Decimal number\]>,<MOVE T1,N>
PARSE	%ASCII,<CALL .ASCQW##>,<OUTSTR [ASCIZ\Ascii string\]>,<MOVE T1,N>
PARSE	%SIXST,<CALL .SIXQW##>,<OUTSTR [ASCIZ\Sixbit string\]>,<MOVE T1,N>
PARSE	%DATIM,<CALL .DATIM##>,<OUTSTR [ASCIZ\Date/time specification\]>,<MOVE T1,N>
PARSE	%DATIP,<CALL .DATIP##>,<OUTSTR [ASCIZ\Date/time in the past\]>,<MOVE T1,N>
PARSE	%DATIF,<CALL .DATIF##>,<OUTSTR [ASCIZ\Date/time in the future\]>,<MOVE T1,N>
PARSE	%VERSI,<CALL .VERSW##>,<OUTSTR [ASCIZ\Version number\]>,<MOVE T1,N>
PARSE	%CORES,<CALL .COREW##>,<OUTSTR [ASCIZ\Core size\]>,<MOVE T1,N>
PARSE	%BLOCK,<CALL .BLOKW##>,<OUTSTR [ASCIZ\File size in words of blocks\]>,<MOVE T1,N>
PARSE	%FILES,<CALL .FILIN##>,<OUTSTR [ASCIZ\File specification\]>,<MOVE T1,T1>
PARSE	%KEYWR,<JRST .KEYWR  >,<CALL .KEYWH>,<MOVE T1,N>
>

XP PRMOFF,<777777,,0>		;Mask for input routine offset
XP PRMADD,<0,,777777>		;Mask for optional additional data

INUM==0
DEFINE	PARSE(SYMBOL,ROUTINE,HELPER,RETINS),<
XP SYMBOL,INUM
INUM==INUM+1
>

	INPUTS

XP PRSMAX,INUM

	SUBTTL	Initialization macros

DEFINE	$INIT(PFX<INI>),<
	.REQUE	REL:DCN,REL:SWIL
	$SRC	PFX
	$EXTERN
	$STACK
>

DEFINE	$SRC(PFX),<
	SALL
	SEARCH	JOBDAT,UUOSYM,MACTEN,SWIL
	IFNDEF HI$SEG,<HI$SEG==640000>
	TWOSEG	HI$SEG
	RELOC	HI$SEG
	RELOC	0
	$$.HGH==HI$SEG
	$$.SEG==-1		;Default to loseg
	$$.LOW==0
	EPFX$$==<LH.ALF&<SIXBIT \PFX\>>
	.XCREF	F,T1,T2,T3,T4,P1,P2,P3,P4,S1,S2,S3,S4,E,U,P,C,N
	DEFINE VRSN.(WHO,VER,MIN,EDT),<
	%%%'PFX==:BYTE (3)WHO(9)VER(6)MIN(18)EDT
	$ABS 137,%%%'PFX>
>

DEFINE	$SETUP(SCNBLK,USRLUO),<
XLIST
IFN <$ONLY&I.PRM>,<
	TDZA	F,F		;Note a zero offset start
	 MOVX	F,1		;Note a CCL start
	MOVEM	F,OFFSET	;Save for scan
>
	RESET			;Stop all I/O, go back to scratch.
	MOVE	P,PDL		;Set up stack.
IFN <$ONLY&I.LUO>,<
	$ABS	<.JB41==:41>,<CALL	LUUO$>	;Setup call to LUUO handler
	PUSH	P,[CALL LUUO$]	;get new instruction, in case wiped out by
	POP	P,.JB41		;  an error somewhere.
>
IFNB \USRLUO\,<
	PUSH	P,[JRST USRLUO]	;Get to user UUO dispatch
	POP	P,USRTRP##	; by telling LUUO what to do
>
IFN <$ONLY&I.CHG>,<
	SETZM	ORGPPN		;zero original PPN.
>
IFN <$ONLY&I.PRM>,<
$LVAR OFFSET			;Place to save starting offset
$LVAR COMNUM			;Command number returned by ISCAN
	IFNB \SCNBLK\,<		;If he supplied us with a scan block, use it
		MOVE T1,SCNBLK	;from the user
	>
	IFB \SCNBLK\,<
		MOVE T1,[XWD 1,[XWD 12,%%FXVE]] ;Use defualt if no block given
	>
	SETOM	WHERAC		;initialize which ac set in use
	ISCAN.	T1,		;Initialize SCAN
	MOVEM	T1,COMNUM	;Save command number for later use
> ;END IFN I.PRM
LIST
> ;END $SETUP MACRO

	SUBTTL	LUUO defintions

DEFINE	LUUOS,<
	LUUO	$LUUOI,LUUOI$	;call one of DCN's routines.
	LUUO	GTTAB.,GTTAB$## ;Do a gettab, always doing non-skip return.
	LUUO	PRMPT.,PRMPT$## ;Prompt if necessary, and get typein
	LUUO	$ERMES,ERMES$,1	;error messages.
	 SUUO	DIE.
	 SUUO	TCHRI.
	 SUUO	TSTRG.
	 SUUO	TLINE.
	 SUUO	ERROR
	 SUUO	ERROR.
	 SUUO	ERROR$
	 SUUO	ERROR%
	 SUUO	WARN
	 SUUO	WARN.
	 SUUO	WARN$
	 SUUO	WARN%
	 SUUO	INFOR
	 SUUO	INFOR.
	 SUUO	INFOR$
	 SUUO	INFOR%
>

	SUBTTL	LUUOI definitions.

INUM==0

DEFINE	LUUO(OPNAM,ROUT,FLAG),<
INUM==INUM+1
ACNUM==0
OPDEF	OPNAM	[<INUM>B8]
>

DEFINE	SUUO(OPNAM),<
OPDEF	OPNAM	[<INUM>B8 ACNUM,]
ACNUM==ACNUM+1
>
INUM==0
	LUUOS

DEFINE	LUUOIS,<
	UUOI	CHPPN.,CHPPN$	;Change PPN
	UUOI	FLERR.,FLERR$	;Type out a file spec and error code.
	UUOI	LERR.,LERR$	;Type out a lookup error code.
	UUOI	GOD.,GOD$,1	;Pivot to [1,2], saving current PPN
	UUOI	UNGOD.,UNGOD$,1	;Pivot back. Clear pivoted flag.
	UUOI	TSIXN.,.TSIXN,1 ;Type out a sixbit value
	UUOI	TDTTM.,.TDTTM,1 ;Type out a given date and time
	UUOI	TDATE.,.TDATE,1 ;Type given date out.
	UUOI	TTIME.,.TTIME,1 ;Type given time
	UUOI	TDECW.,.TDECW,1 ;Type out decimal number
	UUOI	TOCTW.,.TOCTW,1 ;Type number in octal
	UUOI	TXWDW.,.TXWDW,1 ;Type number in octal halfword format
	UUOI	TVERW.,.TVERW,1 ;Type version number
	UUOI	TPPNW.,.TPPNW,1 ;Type a PPN.
	UUOI	TDATN.,.TDATN,1 ;Type the current date.
	UUOI	TTIMN.,.TTIMN,1 ;Type the current time
	UUOI	TCRLF.,.TCRLF,1 ;Type out a carriage return
	UUOI	ISCAN.,ISCAN$	;Initialize scanning routines
	UUOI	QSCAN.,QSCAN$,1	;initialize a new line for partial scan
	UUOI	PSCAN.,PSCAN$,1	;	ditto
	UUOI	VSCAN.,VSCAN$,1	;Verb scanner. Think about this for a while.
	UUOI	REEAT.,REEAT$,1	;Re-eat a character in SCAN context
	UUOI	GTNOW.,.GTNOW	;Get current date/time
>

	DEFINE	UUOI(OPNAM,ROUT,FLAG),<
	INUM==INUM+1
	OPDEF	OPNAM	[$LUUOI INUM]
>
INUM==0

	LUUOIS


	PRGEND

	TITLE	LUUOX		Luuo handler.
	ENTRY	DN.E0		;entry point to ask for to get this loaded.
	SEARCH	DCN
	$SRC	LUO
	SUBTTL	LUUO handler. Dispatch to correct routine
	XP DN.E0,0

;; LUUOX - LUUO handler. Will dispatch to internal LUUOs, or call user
;routine if user has supplied a dispatching instruction at USRTRP
;At dispatch time, stack looks like
;-10(P)	PC at time of LUUO
; -7(P)	E
; -6(P)	U
; -5(P)	P (Reconstructed)
; -4(P)	T1
; -3(P)	T2
; -2(P)	T3
; -1(P)	T4
; 0(P)	Return address, UUORET.
;Acs contain - 
; T1/ contents of AC specified in LUUO
; E/  Dispatch address - Either the opcode, or the EA (If LUUOI)
; U/  The LUUO as retrieved from .JBUUO - EA has been resolved.
;On return, T1 will be stored into the AC used in the LUUO call,
; the rest will be restored to original values.

	EXTERN	.TYOCH

$GVAR	USRTRP			;User LUUO trap - execute if not ours.
$LVAR	SAVEPC			;Location to save recovery PC when we halt.
$LVAR	SAVELU			;Location to save LUUO dipatch instruction
XP	ER$EXT,<Z 2,>		;Bit indicating extended error message.
XP	ER$DIE,<Z 1,>		;Bit indicating message has a die routine.

$HISEG

	SUBTTL	Definitions for LUUO handler

DEFINE	LUUO(OPNAM,ROUT,FLAG<0>),<<FLAG>B0!ROUT>
DEFINE	SUUO(OPNAM),<>

DISP:	LUUOS
XLIST
	REPEAT	<<37+DISP>-.>,<USRUUO> ;Define unused opcodes to be illegal.
LIST

DEFINE	UUOI(OPNAM,ROUT,BIT),<<BIT>B0!ROUT'##>
DISP2:	LUUOIS

ERRTYP:	POINT	2,U,10		;Error code. error,warn,inform
UUOAC::	POINT	4,U,12		;Ac field within LUUO
UUOOPC::POINT	9,U,8		;Get the opcode

	SUBTTL	Dispatch on LUUO

LUUO$::	PUSH	P,.JBUUO
;;	JRST	LUUOX
LUUOX::	PUSH	P,U		;Save old LUUO
	MOVE	U,-1(P)		;Get new opcode.
	MOVEM	E,-1(P)		;Save old dispatch on stack
	MOVE	E,P		;Get current copy of stack pointer
	SUB	E,[3,,3]	;Make it look like P at time of LUUO
	PUSH	P,E		;Save it on stack
	CALL	.PSH4T##	;Save 4 ACs for scratch use.
	LDB	E,UUOAC		;Get the AC field
	CAIL	E,E		;Is AC one of the zapped ones?
	 ADDI	E,-E-6(P)	;Adujst pointer to stack instead of ACs
	MOVE	T1,(E)		;Get the AC contents into T1.
	LDB	E,UUOOPC	;Get the opcode.
	CALL	@DISP-1(E)	;Dispatch to user routine.

UUORET:	SKP			;Normal return.
	 AOS	-7(P)		;Skip return, bump the uuo return PC
	SKIPG	DISP-1(E)	;Does this have the 'no ac' bit?
	 JRST	[CALL .POP4	;Yep - don't screw him over.
		JRST UUORE0]	;And join common code below.
	LDB	E,UUOAC		;AC field
	MOVE	U,T1		;Save value returned by routine
	CALL	.POP4
	CAIL	E,E		;Is AC one of the zapped ones?
	 ADDI	E,-E-2(P)	;Adujst pointer to stack instead of ACs
	MOVEM	U,(E)		;Store value returned in AC
UUORE0:	POP	P,(P)		;Skip over junk P (Add code to compare?)
	POP	P,U
	POP	P,E
	RET

LUUOI$:	HRRZ	E,U		;Get UUOI number
	CAIG	E,INUM		;Range check
	 CAIG	E,0
	  JRST	[MOVE U,[$ERROR(ILU,<Illegal UUOI : >,.TOCTW##,<MOVE T1,E>)]
		JRST ERMES$]	;Make this an error message.
	ADDI	E,DISP2-DISP	;Add in the offset between the two tables.
	JRST	@DISP-1(E)	;Dispatch

USRUUO:	SKIPN	USRTRP		;Did the user set up for trapping LUUOs?
	 JRST	[MOVE E,U	;Save the UUO itself.
		MOVE U,[$ERROR(ILL,<Illegal LUUO : >,.TXWDW##,<MOVE T1,E>)]
		JRST ERMES$]	;Make this an error message
	XCT	USRTRP		;Execute the user trap instruction.
	JRST	UUORET		;Return from user LUUO
	JRST	UUORET+1	;Skip return from user LUUO

EREXIT::HALT	.		;Error exit for undefined things.

.SAVUE::
	EXCH	U,(P)		;save U, get calling PC
	PUSH	P,E		;save E
	PUSH	P,U		;Save calling PC
	MOVE	U,-2(P)		;get u back
	PUSHJ	P,SAVJMP	;call calling routine
	 SKP
	 AOS	-2(P)
	POP	P,E		;restore e
	POP	P,U
	POPJ	P,		;Return

.SAVET::
	EXCH	T1,(P)		;save current value of T1, get calling PC
	PUSH	P,T2
	PUSH	P,T3
	PUSH	P,T4
	PUSH	P,T1		;push calling PC
	MOVE	T1,-4(P)	;restore original value of T1
	PUSHJ	P,SAVJMP	;return to caller, with stack fixed up
	 SKP			;non skip return
	 AOS	-4(P)		;skip return, bump higher level return pc
	POP	P,T4
	POP	P,T3
	POP	P,T2
	POP	P,T1
	RET

.POP4::	POP	P,T1		;Pop return PC
	POP	P,T4		;pop ac
	POP	P,T3
	POP	P,T2
	EXCH	T1,(P)		;pop last ac, leave return PC
	POPJ	P,		;return

SAVJMP:	EXCH	F,-1(P)		;Swap things around a bit
	EXCH	F,(P)		;muddy the water a bit
	EXCH	F,-1(P)		;make things confusing
	POPJ	P,		;return to caller with stack set up

	SUBTTL	Error message typeout

;; ERMES$ - Type out a message, usually an error message.
; Form: <OPCODE AC,ADDR>, Where AC = CODE,ER$EXT,ER$DIE:
;	ER$EXT	Means extended error - has extra routine dispatch.
;	ER$DIE	Means block has a return address.
;	CODE=0	Means no error - Type out routine.
;	CODE=1	Means ERROR (Prefix ?)
;	CODE=2	Means WARN  (Prefix %)
;	CODE=3	Means INFORM(Prefix [)
; ADDR points to block: (Negative offsets only if ER$EXT or ER$DIE)
; -3 or -1) Return address (Known as DIE address)
; -2)	Instruction to execute before calling below
; -1)	Routine to call after printing text, before returning.
;  0)	Sixbit text (3 chars prog, 3 chars error)
;  1)	Start of ASCIZ text
;
; At the time the instruction to execute is executed, E,U, and P have
;	changed, so don't use them as indexes.
;Returns with all acs unchanged.


ERMES$:	LDB	T2,ERRTYP	;Get error type, to get start character
	JUMPE	T2,ERMSPC	;No error type, special cases
	MOVE	T2,[EXP <"?",,0>,<"%",,0>,<"[",,0>]-1(T2)
	HRRI	T2,1(U)		;Char and text
	MOVE	T3,-8(P)	;And the error pc
	MOVE	T1,0(U)		;Prefix
	CALL	.ERMSA##	;Type error stuff
	TXNE	U,ER$EXT	;Did user request a routine?
	TXNN	T1,JWW.FL	;And is first set?
	JRST	ERMES4		;No, don't even bother
	DMOVE	T1,-4(P)	;Get back original values for T registers.
	DMOVE	T3,-2(P)	; so we can print out correct values.
	SKIPN	-2(U)		;Did user give an address?
	 JRST	ERMES3		;No, skip over pre-routine instruction
	XCT	-2(U)		;Execute pre-routine instruction. (Load t1?)
	NOOP			;In case of skip return from instruction
ERMES3:	XCT	-1(U)		;Execute user routine. (PUSHJ P,X?)

ERMES4:	LDB	T1,ERRTYP	;Get error type.
	CAIN	T1,3		;Was it an informational message? ([)
	CALL	.TRBRK##	;Yes, cap it off
	CALL	.TCRLF##	;End the line of text
	TXNE	U,ER$DIE	;Did the user specify a die address?
	 JRST	ERMRTA		;Yes - go get the address.
	LDB	T1,ERRTYP	;No return address - default per error type.
	CAIL	T1,2		;Is this a severe error type?
	 JRST	ERMRET		;Nope - just return normally
ERMES5:	MOVE	T1,[HALT ERMCON] ;HALT continuing at ERMCON
	EXCH	T1,.JB41	;Make it the effect of an LUUO.
	MOVEM	T1,SAVELU	;Save luuo dispatch instruction
	POP	P,(P)		;Don't need normal return address.
	POP	P,T4		;Restore T acs
	POP	P,T3
	POP	P,T2
	POP	P,T1
	POP	P,(P)		;Don't need reconstructed P
	POP	P,U		;...     U
	SOS	E,-1(P)		;Point return back at LUUO itself.
	MOVEM	E,SAVEPC	;Save PC of LUUO.
	POP	P,E		;Restore real value to E
	POPJ	P,		;This will re-execute the LUUO, halting.

ERMCON:	PUSH	P,SAVEPC	;Get address of LUUO ..
	PUSH	P,SAVELU	;Instruction to execute an LUUO
	POP	P,.JB41		; Turn back on LUUO handler.
	SETZM	SAVEPC		;Wipe out old saved address
	RETSKP			;Return skipping over LUUO.

ERMRTA:	TXNN	U,ER$EXT	;Did he have routine and addr as well?
	 SKIPA	T1,-1(U)	;Nope, alternate position
	 MOVE	T1,-3(U)	;Yes, maximum position
	MOVEM	T1,-8(P)	;Make UUO return go there.
ERMRET:	RET			;And "resume" processing

;Special cases of $ERMES - Absolute DIE., and ordinary
;non-error type-out routines

ERMSPC:	MOVEI	T1,(U)		;Get effective address into T1
	TXNN	U,ER$DIE!ER$EXT	;Both bits off?
	 JRST	ERMDIE		;Absolute die.
	TXNN	U,ER$EXT	;Is the extended bit on?
	 JRST	.TCHAR##	;Nope, merely a character type-out
	CALL	.TSTRG##	;And call scan's string typeout routine.
	TXNE	U,ER$DIE	;Die bit here means give CRLF. at end
	 CALL	.TCRLF##	;Set - this means give a free CRLF
	RET			;Return.

ERMDIE:	OUTSTR	[<BYTE (7)7,"?",15,12,"?">
		ASCIZ \Stopcd\]	;Wake up the OPR
	CALL	.TSIXN		;Type out the stopcode name (EA) in sixbit
	OUTSTR	[ASCIZ \. Aborting job!\]
	JRST	ERMES5		;Pop stuff off stack, and halt.
	PRGEND

	TITLE	FLERR	Filop error code routines
	ENTRY	DN.E2
	SEARCH	DCN
	$SRC	FLE
	SUBTTL	Type out filop error codes
	XP DN.E2,0

;;FLERR$ - Type out a FILOP. error code in english
;Call with:
; T1/	Pointer to FILOP block
;
;LERR$ - Type out an error code without typing a file spec
;Call with
; T1/	Error code.

$HISEG

FLERR$::PUSH	P,T1		;Save for later use, also
	HRRZ	T2,.FOLEB(T1)	;Get address of lookup enter block.
	MOVEI	T1,1(T1)	;Point to open block within filop block
	CALL	.TOLEB##	;Type out filename
	CALL	.TSPAC##	;Separator character
	POP	P,T1		;Get back pointer to filop block
	MOVE	T1,.FOLEB(T1)	;Get pointer to lookup block
	MOVE	T2,(T1)		;Get first word of lookup block
	TLNN	T2,-1		;Extended block?
	ADDI	T1,.RBEXT-1	;Increment pointer to compensate.
	HRRZ	T1,1(T1)	;Get right half of extension word - error code.
LERR$::	CAIG	T1,FILLEN	;Is it an error we know of ?
	 JUMPGE	T1,KERR		;Yup - known error.
	PUSH	P,T1		;Save error
	MOVEI	T1,[ASCIZ /ERUNK%(/]
	CALL	.TSTRG##	;Unknown error - tell him
	POP	P,T1		;Get error code back
	CALL	.TOCTW##	;Type error code
	MOVX	T1,-1		;Error -1 = unknown
KERR:	MOVE	T1,FILERR(T1)	;Get address of string
	CALL	.TSTRG##	;Type out the error code name
	CALL	.TCRLF##	;End the line
	RET			;Go back

	SUBTTL	Filop error codes

	[ASCIZ	/) Unknown error for filop/]
FILERR:	[ASCIZ	/ERFNF%(0) File not found/]
	[ASCIZ	/ERIPP%(1) Incorrect PPN/]
	[ASCIZ	/ERPRT%(2) Protection failure/]
	[ASCIZ	/ERFBM%(3) File being modified/]
	[ASCIZ	/ERAEF%(4) Already existing file name/]
	[ASCIZ	/ERISU%(5) Illegal sequence of UUOS/]
	[ASCIZ	/ERTRN%(6) Transmission error/]
	[ASCIZ	/ERNSF%(7) Not a save file/]
	[ASCIZ	/ERNEC%(10) Not enough core/]
	[ASCIZ	/ERDNA%(11) Device not available/]
	[ASCIZ	/ERNSD%(12) No such device/]
	[ASCIZ	/ERILU%(13) Illegal monitor call for GETSEG a filop/]
	[ASCIZ	/ERNRM%(14) No room or quota exceeded/]
	[ASCIZ	/ERWLK%(15) Write-locked/]
	[ASCIZ	/ERNET%(16) Not enough table space/]
	[ASCIZ	/ERPOA%(17) Partial allocation/]
	[ASCIZ	/ERBNF%(20) Block not free/]
	[ASCIZ	/ERCSD%(21) Can't supersede a directory/]
	[ASCIZ	/ERDNE%(22) Can't delete non-empty directory/]
	[ASCIZ	/ERSNF%(23) SFD not found/]
	[ASCIZ	/ERSLE%(24) Search list empty/]
	[ASCIZ	/ERLVL%(25) SFD nest level too deep/]
	[ASCIZ	/ERNCE%(26) No-create for all search list/]
	[ASCIZ	/ERSNS%(27) Segment not on swap space/]
	[ASCIZ	/ERFCU%(30) Can't update file/]
	[ASCIZ	/ERLOH%(31) Low seg overlaps hi seg (getseg)/]
	[ASCIZ	/ERNLI%(32) Not logged in (run)/]
	[ASCIZ	/ERENQ%(33) File still has outstanding locks set/]
	[ASCIZ	/ERBED%(34) Bad .exe file directory (getseg,run)/]
	[ASCIZ	/ERBEE%(35) Bad extension for .exe file(getseg,run)/]
	[ASCIZ	/ERDTB%(36) .Exe directory too big(getseg,run)/]
	[ASCIZ	/ERENC%(37) TSK - Exceeded network capacity/]
	[ASCIZ	/ERTNA%(40) TSK - Task not available/]
	[ASCIZ	/ERUNN%(41) TSK - Undefined network node/]
	[ASCIZ	/ERSIU%(42) Rename - SFD is in use/]
	[ASCIZ	/ERNDR%(43) Delete - file has an ndr lock/]
	[ASCIZ	/ERJCH%(44) Job count high (a.t. read count overflow)/]
	[ASCIZ	/ERSSL%(45) Cannot rename SFD to a lower level/]
FILLEN==.-FILERR
	PRGEND

	TITLE	PROMPT	Input and prompting routines
	ENTRY	DN.E3
	SEARCH	DCN
	$SRC	PRM
	SUBTTL	PRMPT$ - SCAN typein interface.
	XP DN.E3,0
	EXTERN	.ISCAN
;PRMPT$ - Read typing, prompting if necessary. Type out definition
;	of allowable input on an altmode.
;Call
;	(U)-1/	offset in PRMROU to call,,optional extra arg (for keywords)
;	(U)/	start of prompt string
;Return
;	T1/ Value of N after calling routine.

$LOSEG
SCNACS::BLOCK	4		;Swap the 4 P acs, since SCAN trashes them.
WHERAC::BLOCK	1		;which ac set is in use?
$HISEG

DEFINE	PARSE(SYMBOL,ROUTINE,HELPER,RETINS),<ROUTINE>
PRMINP:	INPUTS			;Define input instructions
DEFINE	PARSE(SYMBOL,ROUTINE,HELPER,RETINS),<HELPER>
PRMHLP:	INPUTS			;Define helper instructions
DEFINE	PARSE(SYMBOL,ROUTINE,HELPER,RETINS),<RETINS>
PRMRET:	INPUTS

ISCAN$::CALL	SCANAC		;Get us scans acs for this routine
	SETO	C,		;Pretend EOL character
	CALL	.ISCAN##	;call ISCAN (t1 is loaded with user's AC)
	RET			;return to user

QSCAN$::CALL	SCANAC		;Set up scan's ACs
	JRST	.QSCAN##	;call qscan

PSCAN$::CALL	SCANAC		;set up scan's ACs
	JRST	.PSCAN##	;call pscan

VSCAN$::CALL	SCANAC		;Set up scan's ACs
	CALL	.VSCAN##	;call VSCAN (never to return)
	 NOOP
	$ERROR	IDN,<I don't know what to do with this yet>

REEAT$::CALL	SCANAC		;Get us in SCAN context
	MOVE	P3,T1		;character to re-eat
	JRST	.REEAT##	;Re-eat it

PRMPT$::CALL	.SAVUE##	;save for luuo handler
	CALL	SCANAC		;Get us the scan acs for this routine
	JUMPG	P4,PRMPT4	;If still stuff in buffer, don't prompt
PRMPT0:	JUMPL	P4,PRMPT2	;If non-altmode end of line, skip help
	LDB	T1,[POINTR -1(U),PRMOFF] ;get offset of help instruction
	XCT	PRMHLP(T1)	;type out options for user.
	CALL	.TCRLF##	;put prompt on new line
PRMPT2:	CAXN	P4,.CHEOF	;If eof,
	 EXIT			; crap out here and now
	XMOVEI	T1,(U)		;get address of prompt string
	CALL	.TSTRG##	;type it out.
	CALL	.CLRTI##	;re-initialize for another line
PRMPT4:	CALL	.TIALT##	;get a character from input
	JUMPLE	P4,PRMPT0	;an altmode? he wants list of options, then.
	CALL	.REEAT##	;give scan the character back.
	LDB	E,[POINTR -1(U),PRMOFF] ;Get offset of input instruction
	XCT	PRMINP(E)	;go do the input required
	 NOOP			;ignore possible skip return
	SKIPN	E		;do a re-eat?
	 CALL	.REEAT##	;Yes.
	XCT	PRMRET(E)	;get return value from where it is
	RET			;return to user, with value in ac

PREXIT:	EXIT	1,		;Return to monitor mode, now.
	SETZ	P4,		;forget the EOF
	RET			;and return

SCANAC::AOSE	WHERAC		;increment which AC set we are using
	 JRST	[SOS WHERAC	;already using SCAN acs, don't worry
		RET]
	CALL	SWPACS		;swap in the scan acs
	POP	P,P1		;P1 is only trash, anyway.
	CALL	(P1)		;call main routine, returning here.
	 SKP			;Non skip return
	 AOS	(P)		;bump higher level routine PC
	CALL	SWPACS		;Swap the ACs back to the user ACs
	SOSL	WHERAC		;decrement which ac set in use
	 $ERROR	WAU,<Wrong AC set in use!>
	RET			;and return to higher level routine

SWPACS::EXCH	P1,SCNACS+0	;start swapping the P acs
	EXCH	P2,SCNACS+1
	EXCH	P3,SCNACS+2
	EXCH	P4,SCNACS+3
	RET			;finished swapping.

.CHARH:	LDB	T1,[POINTR -1(U),PRMADD] ;Get pointer to additional info
	SKIPN	T1		;if we got something
	 MOVEI	T1,[ASCIZ \Processor type (Undefined format)\]
	JRST	.TSTRG##	;type it out

.KEYWR:	CALL	.SIXSW##	;Get a sixbit word.
	LDB	P1,[POINTR -1(U),PRMADD] ;get pointer to additional info
	MOVE	T1,(P1)		;This should be a pointer to the keyword table
	MOVE	T2,P3		;look in table to find word.
	CALL	.LKNAM##	;ask scan if he can find the word.
	 JRST KEYWRE		;No such word. Ooops.
	HRRZ	T2,(P1)		;Get addr of first word in table
	SUB	T1,T2		;make T1 be the offset of the keyword
	HRRZI	T1,-1(T1)	;return only right half, and make it 0-n.
	RET			;return, finished

KEYWRE:	SKIPL	T1		;differentiate between ambiguous and unknown
	 $WARN	AMB,<Ambiguous keyword >,.TSIXN##,P3,PRMPT2
	$WARN	UNK,<Unknown keyword >,.TSIXN##,P3,PRMPT2

.KEYWH:	OUTSTR	[ASCIZ\Keywords are:\]
	LDB	P1,[POINTR -1(U),PRMADD] ;pointer to table pointer
	MOVE	P1,(P1)		;get the table aobjn pointer
KEYWH2:	CALL	.TCRLF##	;get us a new line
	MOVEI	P2,^D8		;allow 8 keywords per line
	SKP			;Don't start off the line with a tab
KEYWH4:	 CALL	.TTABC##	;separate keywords with a tab
	MOVE	T1,1(P1)	;get the keyword.
	CALL	.TSIXN##	;type the keyword out
	AOBJP	P1,.POPJ##	;if no more keywords, exit
	SOJLE	P2,KEYWH2	;keep track of number of keywords per line
	JRST	KEYWH4		;type another keyword on this line

	PRGEND

	TITLE	CHPPN	PPN changing
	ENTRY	DN.E6
	SEARCH	DCN
	$SRC	CHP
	SUBTTL	Change PPN and get privs uuos
	XP DN.E6,0

;;CHPPN$ - Change PPN.
; This routine expects to be called with U loaded with an LUUO calling
; this routine, the AC having the destination PPN loaded.
; Returns skip if successful, non-skip if neither CHGPPN nor POKE. succeeds

$BLOCK	POKEBK,3

$HISEG

CHPPN$::CALLI	T1,74		;Calli for chgppn - We have opdefed it.
	 SKP			;didn't work - now we have to work
	RETSKP			;Worked. Return success.
	MOVEM	T1,POKEBK+2	;save for poke.
	GETPPN	T1,		;get our real ppn
	 NOOP
	MOVEM	T1,POKEBK+1	;what we used to be
	MOVE	T1,[.GTPPN,,.GTSLF];Address of PPN table
	GETTAB	T1,		;find out address
	 $DIE	CFP,<?Couldn't even find out where the ppns are>
	HRRZM	T1,POKEBK	;address we want to change
	PJOB	T1,
	ADDM	T1,POKEBK	;we want to do this job's ppn
	MOVE	T1,[3,,POKEBK]	;argument block
	POKE.	T1,		;poke it!
	 RET			;Both failed. Return failure
	RETSKP			;Hah! the poke. succeded.

;GOD. UUO - PIVOT to [1,2], and save current PPN away so we can change
;	back. Takes no arguments.

$GVAR ORGPPN			;Original PPN.

$HISEG

GOD$::
	HRROI	T1,.GTSTS	;Get jbtsts for us.
	GETTAB	T1,
	 $DIE	CGJ,<Couldn't get JBTSTS>
	TLNE	T1,1		;Do we have JACCT?
	 RET			;Don't do anything else, we are PRVJ
	GETPPN	T2,		;Get out current PPN
	 NOOP
	CAMN	T2,[XWD 1,2]	;Are we god already?
	 RET			;Yes, Don't bother setting
	SKIPN	ORGPPN		;Did we store a PPN away before?
	 MOVEM	T2,ORGPPN	;Nope - save this one.
	MOVE	T2,[XWD 1,2]	;GOD ppn. Full privs.
	CHGPPN	T2,		;Try to change our PPN
	 SKP			;No chgppn on this monitor, try poking
	RET			;Set, return
	MOVEM	T1,POKEBK+1	;store as what we used to be
	TLO	T1,1		;Turn on JACCT
	MOVEM	T1,POKEBK+2	;Store as what we want to be
	MOVE	T1,[XWD .GTSTS,.GTSLF] ;Get address of JBTSTS table
	GETTAB	T1,		;     by getting numtab entry for it
	 $DIE	GCA,<Couldn't get address of JBTSTS>
	PJOB	T2,		;Get our job number
	ADDI	T2,(T1)		;use our job number as index within JBTSTS
	HRRZM	T2,POKEBK+0	;Address we are going to poke
	MOVE	T1,[XWD 3,POKEBK] ;Arg block for POKE
	POKE.	T1,		;Poke it away!
	 $ERROR	CSP,<Couldn't set JACCT>
	RET

UNGOD$::
MORTAL:
	SKIPN	T1,ORGPPN	;Did we GOD ourselves first?
	 RET			;Nope - just return quietly
	SETZM	ORGPPN		;Yep, zero it out, since we are now peasants
	CALL	CHPPN$		;Go do the change
	 NOOP			;Ignore.
	RET			;Return to user.
	PRGEND

	TITLE	GTTAB	Gettab luuos
	ENTRY	DN.E7
	SEARCH	DCN
	$SRC	GTT
	SUBTTL	GTTAB. - Do a gettab, and do not give an error return
	XP DN.E7,0
	$HISEG

;GTTAB. - Do a gettab, and always return non-skip. Blow up with error
;message if the gettab fails.

GTTAB$::MOVE	T1,(U)		;Get numbers for gettab.
GTTAB%::GETTAB	T1,		;Try to get the information.
	 $ERROR	GTF,<Gettab failed. Tried for: >,.TXWDW##,T1
	RET

	END