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bb-d549g-sb
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lnk999.mac
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TITLE LNK999 - EMERGENCY SEGMENT FOR LINK
SUBTTL D.M.NIXON/DMN/JBC/JNG/DZN 24-Aug-79
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED
; OR COPIED IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
;COPYRIGHT (C) 1973, 1979 BY DIGITAL EQUIPMENT CORPORATION
SEARCH LNKPAR,LNKLOW,MACTEN,UUOSYM,SCNMAC
SALL
ENTRY LNK999
EXTERN LNKCOR,LNKLOG
CUSTVR==0 ;CUSTOMER VERSION
DECVER==4 ;DEC VERSION
DECMVR==1 ;DEC MINOR VERSION
DECEVR==1220 ;DEC EDIT VERSION
VERSION
SEGMENT
SUBTTL REVISION HISTORY
;START OF VERSION 1A
;64 REDUCE CORE SIZE IF ALL OF CORE IS TAKEN
;77 RESET VERBOSITY IF LNKERR GETSEG FAILS
;START OF VERSION 2
;START OF VERSION 2B
;363 UPDATE MINOR VERSION #
;START OF VERSION 3A
;560 Release on both TOPS-10 and TOPS-20 as LINK version 3A(560)
;START OF VERSION 4
;663 Save GS.FR over LNKCOR call.
;731 SEARCH MACTEN,UUOSYM
;765 Release on both TOPS-10 and TOPS-20 as LINK version 4(765)
;START OF VERSION 4A
;1174 Label and clean up error messages.
;1206 Fix a NO.COR that edit 1174 missed.
;1217 Clean up the listings for release.
;1220 Release on both TOPS-10 and TOPS-20 as version 4A(1220).
SUBTTL EMERGENCY GETSEG
LNK999:
IFE FTSINGLE,< ;SO WE CAN ASSEMBLE WITH ONE CMD FILE
JFCL .+1
MOVE P,SAVEAC+P ;RESTORE PUSHDOWN POINTER
MOVE T1,['LNKERR'] ;SEE WHICH SEGMENT WAS WANTED
CAME T1,SEGBLK+1 ;AS LNKERR CAN CAUSE A LOOP
JRST .+4 ;NO
MOVEI T1,V%M ;ONLY THIS MUCH
CAMGE T1,VERLVL ;BUT NO MORE
MOVEM T1,VERLVL ;AS WE WOULD LOOP
E$$EGD::.ERR. (MS,,V%L,L%I,S%I,EGD,<Emergency GETSEG done>)
HRRZ T1,SEGBLK+2 ;GET ERROR CODE
CAIN T1,ERNEC% ;NOT ENUF CORE?
JRST REDCOR ;YES, REDUCE SIZE
E01GSE::PUSH P,[0] ;[1174] GETSEG ON CHAN 0
.ERR. (LRE,,V%L,L%F,S%F,GSE)
SUBTTL REDUCE CORE
REDCOR: MOVE T1,GS.AB ;TOP OF ACTIVE CORE
IOR T1,.PGSIZ ;IN PAGES
SUB T1,.JBREL ;FIND WHATS FREE
MOVM T1,T1 ;IN A POSITIVE WAY
CAIL T1,8*2000 ;THIS SHOULD BE ENOUGH
JRST [MOVE T1,.JBREL ;GET CURRENT TOP
SUBI T1,8*2000 ;REMOVE ENOUGH
JRST CORUUO]
PUSHJ P,DY.GBC## ;RETURN ALL SPACE WE CAN
PUSHJ P,FX.GBC##
MOVE T1,GS.AB ;SAVE LENGTH OF GS AREA IN USE
SUB T1,GS.LB ;SINCE IT WILL MOVE AND GROW
PUSH P,T1 ;DURING EXPANSION
PUSH P,GS.FR ;[663] SAVE # FREE WORDS
PUSH P,MAXCOR
MOVE T1,.JBREL ;DON'T ALLOW CORE TO EXPAND
MOVEM T1,MAXCOR ;INCASE NO ALL TAKEN YET
MOVEI P1,GS.IX
MOVEI P2,8*2000
PUSHJ P,LNKCOR## ;TRY TO GET ALL WE NEED
CAIA ;TRY AGAIN
JRST REDCR2 ;GOT IT
PUSHJ P,FR.CNT## ;SEE WHATS LEFT
ANDCM T1,.PGSIZ ;IN PAGES OR K
JUMPE T1,E01GSE ;[1174] NO MEMORY AVAILABLE
MOVE P2,T1 ;TRY FOR THIS
PUSHJ P,LNKCOR##
JRST E$$MEF## ;[1206] CAN NOT FAIL
REDCR2: POP P,MAXCOR ;RESTORE FORMER LIMIT
POP P,GS.FR ;[663] RESTORE FREE WORD COUNT
POP P,T1 ;GET LENGTH OF GS AREA BACK
ADD T1,GS.LB ;FIND END
MOVEM T1,GS.AB
CORUUO: CORE T1, ;CUT BACK
JFCL ;NEVER FAILS
MOVE T1,.JBREL ;END OF MEMORY
MOVEM T1,GS.UB
E02GSE::PUSH P,[0] ;[1174] GETSEG ON CHAN 0
.ERR. (LRE,,V%L,L%W,S%W,GSE)
MOVE T1,SEGBLK+1 ;GET NAME WE WANT
JRST @NXTSEG ;GET IT
>;END OF IFE FTSINGLE
SUBTTL THE END
END LNK999