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LINK.DOC: LINK Version 5.1(2030) 14 Feb 83
Copyright (C) 1983 Digital Equipment Corporation, Maynard,
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
LINK is the linking loader for the DECsystem-10. LINK 5.1
is a development release of LINK for the DECsystem-10. This
version includes a number of new features, internal changes,
and bug fixes.
LINK 5.1 supercedes all previous versions. It runs under
all supported monitors, and has been tested under TOPS-10
LINK is documented in the LINK Reference Manual. This
manual is available as part of volume 11 of the TOPS-10
Software Notebooks, or separately as order number
To install LINK the following files must be moved onto SYS:
The LINK.HLP and LINK.DOC files should be moved to the
system directories HLP: and DOC: respectively.
3.0 REBUILDING LINK
All the files required to rebuild LINK are included on the
tape: sources, command files, and a control file. The
control file LINK.CTL reassembles the LINK and OVRLAY
modules and re-links LINK. It requires a time limit of 20
minutes. KS installations may require more time.
Note that in the future LINK patches will be distributed via
AUTOPATCH. This procedure requires a set of unmodified LINK
sources. It is recommended that an unmodified set of LINK
sources be preserved if maintenance edits or site-specific
enhancements are made.
4.0 RECENT CHANGES AND NEW FEATURES
1. Users converting existing FORTRAN applications to
FORTRAN 77 as well as those writing new FORTRAN 77
programs will be able to use the load-time
typechecking facility in LINK. Use the
/DEBUG:ARUGMENTS switch when compiling your FORTRAN
program to get link-time messages flagging
inconsistencies in the number and kind of arguments
being passed to a subroutine or function. In
addition the /ERRORLEVEL or /LOGLEVEL LINK switches
may be used to get more detailed information.
2. If compilation errors occur during the processing
of a LOAD, DEBUG or EXECUTE command LINK will now
issue the ?LNKSUP Loading Suppressed message.
FORTRAN version 7 and future languages will not
necessarily produce .REL files if compilation
errors occur. For languages that produce .REL
files despite errors, run LINK explicitly or give
the LOAD, DEBUG or EXECUTE command a second time.
This will clear the compilation error count and
LINK will load the files.
3. LINK now supports writable overlays. See Chapter 5
of the new LINK-10 manual for more information on
this feature. This chapter has been expanded and
extensively revised and it should prove helpful to
users writing command files to build overlaid
4. LINK supports the following new switches:
/SUPPRESS ( for "undefining" a global symbol ),
/LIMIT ( for limiting the size of a segment or
PSECT ) and /MAXNODE ( for increasing the number of
overlay links that can be included in a single load
). These new switches are described in the new
5. The /PLTTYP switch permits a user to specify
whether a disk file should be plotter format or
1. It is possible to cause infinite looping or illegal
memory references if segments or PSECTs overlap.
This happens because reference chains for
unresolved symbols may be corrupted by the overlap.
Use the /LIMIT switch to set the maximum size of
segments and PSECTs to get memory maps, logs or
other diagnostic information if you find that
changing a program's size or position in memory
causes LINK to loop when loading the program.
2. If a program is being structured to use overlays
and there is a very large number of symbols
associated with a particular overlay link, LINK may
issue an ?LNKMEF memory expansion error if a map
file is requested. If this occurs use the switch
/NOLOCAL on some or all modules being loaded to cut
back the number of symbols.
3. Sites which customize LINK to search user-defined
libraries by default require a patch to the module
LNKINI to avoid an "Unknown Language" error. This
patch will be included in a future AUTOPATCH tape.
4. Users who request a runtime log file for their
overlaid FORTRAN programs require a patch to the
overlay handler. This patch will be included in a
future AUTOPATCH tape.
5. An illegal memory reference may occur when LINK is
writing a line printer format overlay plot. This
patch will be included in a future AUTOPATCH tape.
6.0 NOTES ON .REL BLOCK RESTRICTIONS FOR COMPILER WRITERS
1. There are inconsistencies in the usage of PSECT
indices in old and new .REL blocks.
2. LINK currently expects type 1120-1127 blocks to use
routine names that can be translated to SIXBIT and
which are unique in the first six characters. Also
this routine name must be a global symbol. Type
mismatch warnings also display only the first six
SIXBIT characters of the global symbol name. No
currently supported language is affected by this
3. The .TPLOD bit defined for the type 1120-1127
blocks is not currently used. No currently
supported language is affected by this deficiency.
4. There are conflicts between the documentation and
the implementation of type 1070 blocks:
Fullword addition is used for additive symbol
Right halfword addition is used for other additive
Fullword fixups are done when thirty-bit fixups are
No currently supported language is affected by these
[ End of LINK.DOC ]