Trailing-Edge
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PDP-10 Archives
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BB-H580E-SB_1985
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xpnppl.mac
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TITLE XPNPPL FOR COBOL V12C
SUBTTL HANDLE APR TRAPS AL BLACKINGTON/CAM
SEARCH COPYRT
SALL
;COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1974, 1985
;ALL RIGHTS RESERVED.
;
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
;ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
SEARCH P
%%P==:%%P
;EDITS
;V10*****************
;NAME DATE COMMENTS
;********************
TWOSEG
.COPYRIGHT ;Put COPYRIGHT statement in .REL file.
RELOC 400000
ENTRY XPNPPL
EXTERNAL KILL
;THIS ROUTINE HANDLES APR TRAPS FOR:
; 1) ILLEGAL MEMORY REFERENCES (MEMORY PROTECTION FAILURE)
; 2) NON-EXISTENT MEMORY REFERENCES
; 3) PUSH-DOWN OVERFLOW (EXCEPT PHASE E -- SEE XPNPPE)
XPNPPL: MOVEM PP,KILLAC ;SAVE AC'S
MOVE PP,ACXWD
BLT PP,KILLAC+3
MOVE TA,.JBCNI## ;GET APR FLAGS
TRNE TA,1B19 ;PUSH-DOWN OVERFLOW?
JRST XPNPL1 ;YES
TRNE TA,1B22 ;ILEGAL MEMORY REFERENCE?
JRST XPNPL2 ;YES
TRNE TA,1B23 ;NON-EXISTENT MEMORY?
JRST XPNPL3 ;YES
MOVEI TA,[ASCIZ "Unknown APR trap"]
JRST XPNPL6
XPNPL1: MOVEI TA,[ASCIZ "Push-down Overflow"]
JRST XPNPL6
XPNPL2: SKIPA TA,[EXP [ASCIZ "Illegal Memory Reference"]]
XPNPL3: MOVEI TA,[ASCIZ "Reference to non-existent memory"]
XPNPL6: TTCALL 3,(TA) ;TYPE MESSAGE
TTCALL 3,[ASCIZ " at location "]
MOVE TA,[POINT 3,.JBTPC##,17] ;TYPE OUT LOCATION
XPNPL7: ILDB TC,TA
ADDI TC,"0"
TTCALL 1,TC
TLNE TA,770000
JRST XPNPL7
TTCALL 3,[ASCIZ "
"]
MOVS PP,ACXWD ;RESTORE AC'S
BLT PP,TA
MOVE PP,KILLAC
JRST KILL
ACXWD: XWD TC,KILLAC+1
EXTERNAL KILLAC
END