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+.\"	@(#) ld.1:	2.3 11/17/83
+.ds ZZ DEVELOPMENT PACKAGE
+.TH MC68LD 1 "630 MTG" 
+.SH NAME
+mc68ld \- link editor for MC68000 object files
+.SH SYNOPSIS
+\f3mc68ld [\f1 options \f3]\f1 file-names
+.SH DESCRIPTION
+The
+.I mc68ld
+command
+combines several
+object files into one,
+performs relocation,
+resolves external symbols,
+and supports symbol table information
+for symbolic debugging.
+In the simplest case, the names of several object
+programs are given, and
+.I mc68ld
+combines them, producing
+an object module that can either be executed or
+used as input for a subsequent
+.I mc68ld
+run.
+The output of
+.I mc68ld
+is left in
+.BR mc68a.out .
+This file is executable
+if no errors occurred during the load.
+If any input file,
+.IR file-name ,
+is not an object file,
+.I mc68ld
+assumes it is either a text file containing link editor directives
+or an archive library.
+(See
+the \f2Link Editor\f1 in the \f2UNIX System V Support Tools
+Guide\f1 for a discussion of input directives.)
+.PP
+If any argument is a library, it is searched exactly once
+at the point it is encountered in the argument list.
+Only those routines defining an unresolved external
+reference are loaded.
+The order of library members is unimportant because
+\fImc68ld\fR passes through each library's (archive) symbol
+table as many times as necessary until no new
+external symbols are resolved and no new references are generated.
+.PP
+The following options are recognized by
+.IR mc68ld .
+.TP \w'\fB\-u\fP\ symname\ \ 'u
+.if !'mc68'' \{\
+.B \-a
+Produces an absolute file; gives warnings for undefined references.
+Relocation information is stripped from the output object file
+unless the
+.B \-r
+option is given. The
+.B \-r
+option is needed only when an absolute file should retain its
+relocation information (the normal case for the 630 MTG
+downloaded programs).
+If neither
+.BR \-a " nor " \-r
+is given,
+.B \-a
+is assumed.
+\}
+.TP
+.BR \-e " epsym"
+Sets the default entry point address for the output file to be that of
+the symbol
+.IR epsym .
+.if \nF \{\
+This option forces the
+.B \-X
+option to be set. \}
+.TP
+.BR \-f " fill"
+Sets the default fill pattern for ``holes'' within
+an output section as well as initialized bss sections.
+The argument \fIfill\fP is a two-byte constant.
+.if 'mc68'b16' \{\
+.TP
+.B \-i
+This option specifies that separate ``I'' and ``D'' space are to be
+generated.
+.B \-i
+has no effect if
+.B \-tv
+is given.
+This allows 64K of instructions and 64K of data.
+'br \}
+.if 'mc68'x86' \{\
+.TP
+.B \-i
+This option specifies that separate ``I'' and ``D'' space is to be
+generated.
+The option
+.B \-i
+has no effect if
+.B \-tv
+is given.
+This allows up to 1 MB of text and 1 MB of data.
+'br \}
+.ie \nD \{\
+.TP
+.BR \-l "x"
+Searchs a library
+.BI lib x .a,
+where \fIx\fR is up to seven characters.
+A library is searched when its name is encountered,
+so the placement of a \fB\-l\fR
+is significant.
+By default, libraries are located in
+.ie 'mc68''
+.BR /lib.
+.el $DMD/lib.
+'br \}
+.el \{\
+.TP
+.BI \-l x
+Searches a library
+.BI lib x .a,
+where \fIx\fR is up to seven characters.
+A library is searched when its name is encountered,
+so the placement of a \fB\-l\fR
+is significant.
+By default, libraries are located in
+.ie 'mc68'' /lib and /usr/lib.
+.el $DMD/lib .
+'br \}
+.TP
+.B \-m
+Produces a map or listing of the input/output sections
+on the standard output.
+.TP
+.BR \-o " outfile"
+Produces an output object file by the name 
+.IR outfile .
+The name of the default object file is
+.BR mc68a.out .
+.TP
+.B \-r
+Retains relocation entries in
+the output object file.
+Relocation entries must be saved if the 
+output file is to become an input file in a
+subsequent
+.I mc68ld
+run.
+.ie 'mc68'' The
+.el \{\
+Unless
+.B \-a
+is also given, the
+\}
+link editor will not complain about
+unresolved references.
+.TP
+.B \-s
+Strips line number entries and
+symbol table information
+from the output object file.
+.if \nG \{\
+.TP
+.B \-t
+Turns off the warning about multiply defined symbols that are
+not the same size.
+'br \}
+.if \nC \{\
+.TP
+.B \-tv
+Transfer vector object files are expected.
+When libraries are searched with this option,
+component object modules with the wrong magic
+number are ignored (as are transfer vector modules
+when
+.B \-tv
+is not given).
+The default is
+.I no
+transfer vectors.
+'br \}
+.TP
+.BR \-u " symname"
+Enters \fIsymname\fP as an undefined symbol
+in the symbol table.
+This is useful
+for loading entirely from a library, since initially the symbol
+table is empty and an unresolved reference is needed
+to force the loading of the first routine.
+.\" .if \nG \{\
+.\" .TP
+.\" .B \-x
+.\" Do not preserve local (non-.globl) symbols in the output symbol
+.\" table; enter external and static symbols only.  This option saves
+.\" some space in the output file.
+.\" 'br \}
+.if \nH \{\
+.TP
+.B \-z
+Do not bind anything to address zero.  This option will catch null
+pointers.
+.TP
+.B \-F
+Allows the object module to be paged.
+'br \}
+.TP
+.BR \-L " dir"
+Changes the algorithm of searching for
+.BI lib x .a
+to look in
+.IR dir
+before looking in $DMD/lib.
+This option is effective only if it precedes the
+.B \-l
+option on the command line.
+.if \nG \{\
+.TP
+.B \-M
+Outputs a message for each multiply defined external definition.
+'br \}
+.TP
+.B \-N
+Puts the data section immediately following the text in the output file.
+.TP
+.B \-V
+Outputs a message giving information about the version of mc68ld
+being used.
+.TP
+.BR \-VS " num"
+Uses
+\f2num\f1
+as a decimal version stamp
+identifying the
+.BR mc68a.out
+file that is produced.  The version
+stamp is stored in the optional header.
+.if \nF \{\
+.TP
+.B \-X
+Generates a standard UNIX file header within the ``optional header''
+field in the output file.
+'br \}
+.DT
+.br
+.DT
+.SH FILES
+.PD 0
+.TP 25
+.ie 'mc68'' /lib/lib\fI?\fR.a
+.el $DMD/lib/lib\fI?\fR.a
+libraries
+.if 'mc68'' \{\
+.TP 25
+/usr/lib/lib?.a
+libraries
+\}
+.TP 25
+mc68a.out
+output file
+.PD
+.SH "SEE ALSO"
+dmdcc(1), mc68as(1).
+.br
+a.out(4), ar(4) in the \f2UNIX System V Programmer's
+Reference Manual\f1.
+.bp
+.SH WARNINGS
+Through its options and input directives, the Motorola 68000 link editor gives
+users great flexibility;
+however, those who use the input directives must assume
+some added responsibilities.
+Input directives and options should insure the following properties
+for programs:
+.if 'mc68'b16' \{\
+.IP \- 5
+C programs must have data
+.RB ( .data "), bss (" .bss ),
+and stack space in one 64K byte region.
+Stack space
+.I must
+be provided.
+'br \}
+.IP \- 5
+C defines a zero pointer as null.
+A pointer to which zero has been assigned must
+not point to any object.
+To satisfy this, users must not place any object
+at virtual address zero in the data space.
+.tr ~
+.IP \- 5
+When the link editor is called through
+.IR dmdcc (1),
+a startup routine is linked with the user's program. This
+routine usually calls exit(~) [see
+.IR exit (3R)]
+after execution of the main program. If the user
+calls the link editor directly, then the user must insure that
+the program always calls exit(~) rather than falling through the
+end of the entry routine.
+.if 'mc68'b16' \{\
+.IP \- 5
+Without a transfer vector, all text (code)
+must reside within a single 64K-byte area.
+Transfer vector function linkage removes this
+restriction.
+.PP
+By default, the link editor takes care of these
+things.
+Specifying regions or defining sections with names other
+than
+.BR .bss ", " .data ", " .text ", or"
+.B .tv
+can decrease the link editor's ability to do these
+automatically.
+In general, users should not specify regions when the
+program uses a transfer vector.
+'br \}
+.if \nC \{\
+.SH BUGS
+.I mc68ld
+can not currently create transfer vector symbols.
+Thus no symbols created through assignment in an
+input directive will be given an entry in the transfer vector.
+In particular, this means the entry point of a program
+can not be redefined by assignment to
+.BR main .
+Unsuspecting users who create such a symbol and expect it
+to be in the transfer vector receive an obscure error
+message about an invalid transfer vector relocation reference.
+'br \}
+.PP
+The
+\f3\-VS\f1 \f2num\f1
+option has an effect only when the
+.B "\-X"
+option is also selected.