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glxini.x24
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TITLE GLXINI - Bootstrap code for GALAXY runtime system
SUBTTL Irwin L. Goverman/ILG/PJT/DC/DPM/CTK 25-Sep-83
;
;
; COPYRIGHT (c) 1975,1976,1977,1978,1979,1980,1981,1982,
; 1983,1984,1985,1986
; DIGITAL EQUIPMENT CORPORATION
; 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
; AND WITH THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS
; SOFTWARE OR ANY OTHER COPIES THEREOF MAY NOT BE PROVIDED OR
; OTHERWISE MADE AVAILABLE TO ANY OTHER PERSON. NO TITLE TO
; AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
;
; THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE
; WITHOUT NOTICE AND SHOULD NOT BE CONSTRUED AS A COMMITMENT
; BY DIGITAL EQUIPMENT CORPORATION.
;
; DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY
; OF ITS SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY
; DIGITAL.
;This module is loaded in the low segment of any program
; using the GALAXY library code, GLXLIB.
SEARCH GLXMAC ;SEARCH GLXMAC FOR SYMBOL DEFS
PROLOG(GLXINI,INI)
INIEDT==24 ;EDIT LEVEL FOR MODULE
SUBTTL Table of Contents
; TABLE OF CONTENTS FOR GLXINI
;
;
; SECTION PAGE
; 1. Table of Contents......................................... 2
; 2. Revision History.......................................... 3
; 3. I%INIT - Initialize the runtime system.................... 4
; 4. ACQLIB - Acquire the run-time system...................... 5
; 5. CHKLIB - Routine to test if library is in place........... 7
; 6. TRYSEG - Routine to fetch runtime system.................. 8
SUBTTL Revision History
COMMENT \
Revision History
EDIT GCO DISCRIPTION
0002 Changed I%INIT so it can accept a zero length IB and
to pass the major change level in S2 instead of IB.PID
0004 Changed PROLOG to process GLXINI as a library component
0005 Pull PFH out of GLXINI. It now lives in the sharable
high segment
0006 using stkvars to provide space for string for gtjfn
change tryseg to get the entire exe file instead of
certain pages
0007 Define %%.GLX external to pick it up from the main program
0010 Don't $STOP if MERGE. UUO fails, it'll just
?Ill mem ref
0011 Correct logic for deceiding where to obtain OTS. In particular,
add SFD support.
0012 Plug a security leak that allowed a JACCT'ed program to grab
a private copy of the library.
0013 Make GLXLIB run execute-only.
1) Set up APR trap prior to call to I%INI1.
2) Remove code to merge GLXLIB data pages.
0014 Restructure GLXLIB
1) Rework CDO macro to generate a table that kinda parallels
thehigh segment entry vector and call it ENTVEC just to
cunfuse things. This is required for extended addressing
and saves and incompatible change later on.
2) If the program is execute-only, do a physical-only GETSEG.
0015 3/21/81 Change .JBHGH reference in I%INIT (for T20) to use .JBHSO
Change reference to CORG in CHKLIB to use .JBHSO instead
0016 3/27/81 Change $RETT at ACQL.3+5 to POPJ since the entry vector
is not yet set up.
0017 4/6/81 Restructure GLXINI so the 20 works. Force all system
dependent code into TRYSEG and CHKLIB. Find the
beginning of the dispatch table by getting the entry
vector on the 20. Set .JBHSO ourselves so DDT can find
symbols.
0020 4/14/81 Set right half of .JBHRL to -1 so DDT believes the symbols.
0021 7/13/81 Do not initialize the entry vector if already initialized.
0022 9/25/83 Fix non problem coding error.
SPR 10-33434/CTK
0024 6/23/89 Fix to use SEGOP. UUO for 7.04 and later monitors, so
that GLXLIB can be an additional hiseg.
GCO 10671 /RCB
\ ;end of revision history
SUBTTL User referenced entry vector
; All references to the OTS by the user are through ENTVEC table
;
ZZ==0 ;;INITIALIZE COUNTER
DEFINE CDO (X),< ;;MACRO TO DEFINE ENTRY POINTS
IFNB <X>,<X::> ;;DEFINE GLOBAL IF NOT NULL
JRST @.+1 ;;DISPATCH
EXP ZZ ;;STORE INDEX INTO GLXOTS
ZZ==ZZ+1 ;;POINT TO NEXT ENTRY
> ;;END OF CDO MACRO
DEFINE NT(X),< ;;MACRO FOR GLXINI ENTRY POINTS
IFNB <X>,<GLOB X> ;;MAKE ENTRY POINT GLOBAL
BLOCK 2 ;;KEEP THE VECTOR STRAIGHT
ZZ=ZZ+1 ;;POINT TO THE NEXT ENTRY
> ;;END NT MACRO
ENTVEC::LIBVEC ;DEFINE ALL ENTRY POINTS
EXP -1 ;TERMINATE VECTOR
WORK: BLOCK 20 ;Get space for working
ARG: BLOCK .SGFSP+1 ;Get space for argument block...
ARGFIL: BLOCK .SGFLN ;SPACE FOR FILESPEC BLOCK
OLDMON: BLOCK 1 ;FLAG FOR WHETHER SEGOP. EXISTS
; Set up correct places to search for the library depending on the system.
TOPS10<
DSKDEV: SIXBIT/DSK/
SYSDEV: SIXBIT/SYS/
> ; End of TOPS10
TOPS20<
DSKDEV: [ASCIZ/DSK:/]
SYSDEV: [ASCIZ/SYS:/]
> ; End of TOPS20
COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1971,1986.
ALL RIGHTS RESERVED.
\;END OF COPYRIGHT MACRO
SUBTTL I%INIT - Initialize the runtime system
;Entry point for segment and module initialization
;CALL IS: S1/ Length of IB (Runtime Initialization Block)
; S2/ Address of IB
ENTRY I%INIT
I%INIT: PUSH P,S1 ;SAVE INPUT ARGS AWAY
PUSH P,S2 ;
PUSHJ P,CHKLIB ;SEE IF THE LIBRARY IS ALREADY THERE
JUMPT INIT.2 ;IT IS - SKIP LOTS OF STUFF
PUSHJ P,ACQLIB ;ACQUIRE THE LIBRARY SYSTEM
SKIPE ENTVEC+1 ;Is the entry vector initialized?
JRST INIT.2 ;Yes, don't do it again.
SETZM S2 ;Set up index
INIT.1: ADDM S1,ENTVEC+1(S2) ;ADJUST INDEX INTO GLXOTS
ADDI S2,2 ;ACCOUNT FOR TWO WORD ENTRIES
SKIPL ENTVEC(S2) ;END OF VECTOR ?
JRST INIT.1 ;NO - LOOP
INIT.2: POP P,S2 ;RESTORE USER'S S2
POP P,S1 ;RESTORE USER'S S1
SEGIN:: HRLI S1,%%.GLX ;LOAD VERSION
PUSHJ P,ENTVEC ;CONTINUE INITIALIZATION
$RETT ;RETURN TO CALLER
SUBTTL ACQLIB - Acquire the run-time system
; Here if the OTS is not in place. If this is a debugging world,
; look first in DSK:. If that fails, or if we are not debugging,
; look in SYS:. If not found, give an error message and quit.
; If found, return the address of the dispatch table for the library
; in S1.
;
; Call: No arguments
;
; Return: S1 / Address of OTS dispatch table (returned from TRYSEG)
;
ACQLIB: SKIPN DEBUGW ;Debugging ?
JRST ACQL.1 ;Nope - skip checking on DSK
MOVE S1,DSKDEV ;Try generic DSK
PUSHJ P,TRYSEG ;Try it again
JUMPT ACQL.2 ;If sucessful - finish up
ACQL.1: MOVE S1,SYSDEV ;Try SYS
PUSHJ P,TRYSEG ;One more time
JUMPT ACQL.2 ;If sucessful - finish up
TOPS10<
OUTSTR [ASCIZ |? GLXINI - Unable to obtain run-time system|]
MONRT. ;Stop
> ; End of TOPS10
TOPS20<
HRROI S1,[ASCIZ \? GLXINI - Unable to obtain run-time system
\]
PSOUT
HALTF
> ; End of TOPS20
JRST .-1 ;We really don't want to continue
ACQL.2: POPJ P, ;Return
SUBTTL CHKLIB - Routine to test if library is in place
;CHKLIB looks for the first page of the OTS library. If this page
; is there, it is assumed that the library was loaded with the
; calling program, or has been pre-merged.
;CALL IS: No arguments
;
;TRUE RETURN: Library is in place
;
;FALSE RETURN: Library is not there
CHKLIB:
TOPS10 <
SETZM OLDMON ;ASSUME A NEW MONITOR
MOVX S1,OTSNAM ;NAME OF DESIRED HISEG
MOVEM S1,ARG+.SGSNM ;SET FOR .SGINF CALL
SETZM ARG+.SGSGN ;WE DON'T KNOW THE SEGMENT NUMBER YET
SETZM ARG+.SGFLG ;WE NEED NO FLAGS
XMOVEI S1,ARGFIL ;POINT TO THE FILE BLOCK
MOVEM S1,ARG+.SGFSP ;SET IN THE ARGUMENT BLOCK
MOVX S1,<.SGFSP+1,,.SGINF> ;LENGTH,,FUNCTION
MOVEM S1,ARG+.SGFNC ;SET FOR UUO
MOVE S1,[IFIW ARG] ;LOCAL POINTER TO THE ARG BLOCK
SEGOP. S1, ;SEE IF WE HAVE THE SEGMENT
TRNA ;MAYBE NOT--ANALYZE ERROR
JRST .RETT ;YES--RETURN GOODNESS
JUMPGE S1,.RETF ;IF AN ERROR CODE, THEN WE DON'T HAVE IT
;HERE IF SEGOP. FAILED DUE TO AN OLD MONITOR. CHECK THE OLD WAY.
SETOM OLDMON ;TELL TRYSEG THERE'S NO SEGOP. UUO
HRRZ S1,.JBHRL ;Get highest addr in high seg
SKIPN S1 ;Is there a segment? Yes, skip
TDZA TF,TF ;LOAD "FALSE" INTO TF
MOVX TF,TRUE ;ELSE ITS THERE
POPJ P, ;RETURN IN EITHER CASE
> ;END TOPS10 CONDITIONAL
TOPS20 <
MOVE S1,.JBHSO ;FIRST PAGE OF LIBRARY
JUMPE S1,[MOVX TF,FALSE ;If zero, then not set up
JRST CHKL.1] ;Return false
HRLI S1,.FHSLF ;FOR THIS PROCESS,
RPACS ;READ THE ACCESS BITS
ERJMP .+2 ;IF FAILS, SAY OTS NOT THERE
TXNN S2,PA%PEX ;CHECK FOR PAGE'S EXISTENCE
TDZA TF,TF ;IF PAGES DON'T EXIST, RETURN
MOVX TF,TRUE ;ELSE TRUE,INDICATING OTS IN PLACE
CHKL.1: POPJ P, ;RETURN
> ;END TOPS20 CONDITIONAL
SUBTTL TRYSEG - Routine to fetch runtime system
;CALL IS: S1/ Device to get runtime system from in SIXBIT (TOPS10)
; Address of device string (TOPS20)
;
;TRUE RETURN: Segment is in place
; with S1/ Address of dispatch table
;FALSE RETURN: Segment could not be obtained
TOPS10 <
JS.XO==2000 ;EXECUTE-ONLY BIT IN JOB STATUS WORD
TRYSEG: MOVEM S1,ARGFIL+0 ;STORE DEVICE NAME
MOVX S1,OTSNAM ;NAME OF OTS
MOVEM S1,ARGFIL+1 ;STORE THE FILE NAME
HRROI S2,.GTSTS ;GET JOB STATUS
GETTAB S2, ;FROM THE MONITOR
SETZ S2, ;CAN'T - ASSUME NOT EXECUTE ONLY
TRNN S2,JS.XO ;EXECUTE ONLY?
TDZA S2,S2 ;NO
MOVX S2,UU.PHY ;YES - SET FOR PHYSICAL ONLY GETSEG
SKIPE OLDMON ;IF WE KNOW THAT SEGOP. WON'T DO,
JRST TRYS.2 ;THEN DON'T ATTEMPT IT
SETZM ARGFIL+2 ;DEFAULT EXTENSION
SETZM ARGFIL+3 ;AND PPN
SETZM ARGFIL+4 ;AND PATH
MOVEI S1,.SGGET ;OUR FUNCTION CODE
HRRM S1,ARG ;SET IN ARG BLOCK
XMOVEI S1,ARG ;POINT TO THE ARGUMENT BLOCK
SEGOP. S1,(S2) ;TRY TO GET THE SEGMENT
JRST .RETF ;PROPAGATE FAILURE
HRRZ S1,ARG+.SGORG ;GET THE LOCAL ORIGIN
PG2ADR S1, ;CONVERT PAGE NUMBER TO ADDRESS
HRR S1,.JBHSA(S1) ;ENTRY IS AT THE OTS START ADDRESS
JRST .RETT ;WE WIN
TRYS.2: MOVE S1,[0,,WORK+0] ;BLT THE ACS AWAY
BLT S1,WORK+17 ;STORE THEM
MOVEI S1,ARGFIL ;GET LOCATION OF BLOCK
GETSEG S1,(S2) ;ATTACH HIGH SEGMENT
TDZA TF,TF ;IF FAILS, FAKE A FALSE
MOVX TF,TRUE ;ELSE LOAD A "TRUE"
MOVE S1,[WORK+S2,,S2] ;RESTORE SOME ACS
BLT S1,17 ;
JUMPF TRYS.1 ;False, return
MOVE S1,[XWD -2,.GTUPM] ;Get UPM word for our high seg.
GETTAB S1, ;Ask the monitor
HRLI S1,.JBHGH ;Monitor won't give it, assume 400000
HLRZS S1 ;Get high seg start adr
ADDI S1,.JBHDA ;Point past JOBDAT
TRYS.1: POPJ P, ;RETURN
> ;END TOPS10 CONDITIONAL
TOPS20 <
TRYSEG: MOVE TF,S1 ;Save device string a second
MOVX S1,.FHSLF ;For self
GEVEC ;Get entry vector word
PUSH P,S2 ;And save it
MOVE S1,TF ;Restore s1
HRLI S1,(POINT 7,0) ;Make the address a byte pointer
MOVE S2,[POINT 7,WORK] ;Generate a pointer to destination for
; string
TRYS.1: ILDB TF,S1 ;Get a byte of the device string
JUMPE TF,TRYS.2 ;Done?
IDPB TF,S2 ;No, save the byte
JRST TRYS.1 ;Go get another
TRYS.2: MOVE S1,[POINT 7,OTSNAM] ;Get the name of the OTS
TRYS.3: ILDB TF,S1 ;Get a byte of the OTS name
IDPB TF,S2 ;Save the byte
JUMPN TF,TRYS.3 ;Get till done
MOVX S1,GJ%SHT+GJ%OLD ;SHORT GTJFN, OLD FILE
MOVE S2,[POINT 7,WORK] ;Get the pointer to the beginning of
; the string
GTJFN ;TRY TO GET A HANDLE ON THE FILE
JRST TRYS.4 ;FAKE A FALSE RETURN
TXO S1,GT%ADR ;SET BIT FOR ADDRESS SELECTION
HRLI S1,.FHSLF ;FOR MYSELF
MOVE S2,[1,,760] ;ALL PAGES FROM 1 TO 760
GET ;GET THE SEGMENT
ERJMP TRYS.4 ;IF GET FAILS, RETURN FALSE
MOVX S1,.FHSLF ;For self
GEVEC ;Get entry vector word for OTS
HRRZS S2,S2 ;Get only the address
MOVE TF,S2 ;Save it
ADR2PG S2 ;Make a page number
MOVEM S2,.JBHSO ;Save it for DDT and CHKLIB
HLLOM S2,.JBHRL## ;Convince DDT to use the symbols
POP P,S2 ;Restore entry vector word
SEVEC ;Set it back
MOVE S1,TF ;Get address of dispatch vector
MOVX TF,TRUE ;We are ok
JRST TRYS.5 ;go to return
TRYS.4: MOVX TF,FALSE ;HERE FOR FALSE RETURN
POP P,S2 ;Restore stack
TRYS.5: POPJ P, ;AND RETURN
> ;END TOPS20 CONDITIONAL
SUBTTL RETURN ENTRY POINTS
; These are alternate return points that can be called from
;the user program to avoid having to go through the OTS. Since
;most programs do a lot of $RETx's, using these routines can
;save a great deal of time.
;
; Note: any resemblence to this code, and that found that in GLXCOM
;is purely intentional.
; .RETT and .RETF are called via the $RETT and $RETF macros and can also
; be called directly. They both set the value of TF, one to TRUE and the other
; to FALSE. After doing this, they return via a POPJ P,
;
.RETF: TDZA TF,TF ;ZEROS MEAN FALSE
.RETT: SETO TF, ;ONES MEAN TRUE
POPJ P, ;RETURN
; The .POPJ and .POPJ1 routines can be jumped
; to get a return, without changing the value in the TF register
;
.POPJ1: AOS (P) ;SKIP
.POPJ: POPJ P, ;RETURN
INI%L:
END