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authorKen Raeburn <raeburn@cygnus>1993-11-05 19:21:35 +0000
committerKen Raeburn <raeburn@cygnus>1993-11-05 19:21:35 +0000
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treebfdd54a7a69837ca4ccc483505d48f44a82c8c6d /ld
parentea18081db683908756fef0844c2eb28afc63fa9c (diff)
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First cut at sanitization, doc files, &c for gas/binutils releases
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diff --git a/ld/ld.info b/ld/ld.info
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+This is Info file ld.info, produced by Makeinfo-1.55 from the input
+file ./ld.texinfo.
+
+START-INFO-DIR-ENTRY
+* Ld:: The GNU linker.
+END-INFO-DIR-ENTRY
+
+ This file documents the GNU linker LD.
+
+ Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
+
+ Permission is granted to make and distribute verbatim copies of this
+manual provided the copyright notice and this permission notice are
+preserved on all copies.
+
+ Permission is granted to copy and distribute modified versions of
+this manual under the conditions for verbatim copying, provided also
+that the entire resulting derived work is distributed under the terms
+of a permission notice identical to this one.
+
+ Permission is granted to copy and distribute translations of this
+manual into another language, under the above conditions for modified
+versions.
+
+
+Indirect:
+ld.info-1: 857
+ld.info-2: 49400
+
+Tag Table:
+(Indirect)
+Node: Top857
+Node: Overview1330
+Node: Invocation2478
+Node: Options2886
+Node: Environment20209
+Node: Commands21154
+Node: Scripts22148
+Node: Expressions23246
+Node: Integers24173
+Node: Symbols25012
+Node: Location Counter25572
+Node: Operators26768
+Node: Evaluation27678
+Node: Assignment28373
+Node: Arithmetic Functions31454
+Node: MEMORY35234
+Node: SECTIONS37821
+Node: Section Definition39419
+Node: Section Placement40867
+Node: Section Data Expressions45560
+Node: Section Options49400
+Node: Entry Point51581
+Node: Option Commands53174
+Node: Machine Dependent56493
+Node: H8/30056913
+Node: i96057708
+Node: BFD58918
+Node: BFD outline62281
+Node: BFD information loss63566
+Node: Canonical format66074
+Node: MRI70420
+Node: Index74894
+
+End Tag Table
diff --git a/ld/ld.info-1 b/ld/ld.info-1
new file mode 100644
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--- /dev/null
+++ b/ld/ld.info-1
@@ -0,0 +1,1255 @@
+This is Info file ld.info, produced by Makeinfo-1.55 from the input
+file ./ld.texinfo.
+
+START-INFO-DIR-ENTRY
+* Ld:: The GNU linker.
+END-INFO-DIR-ENTRY
+
+ This file documents the GNU linker LD.
+
+ Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
+
+ Permission is granted to make and distribute verbatim copies of this
+manual provided the copyright notice and this permission notice are
+preserved on all copies.
+
+ Permission is granted to copy and distribute modified versions of
+this manual under the conditions for verbatim copying, provided also
+that the entire resulting derived work is distributed under the terms
+of a permission notice identical to this one.
+
+ Permission is granted to copy and distribute translations of this
+manual into another language, under the above conditions for modified
+versions.
+
+
+File: ld.info, Node: Top, Next: Overview, Prev: (DIR), Up: (DIR)
+
+Using ld
+********
+
+ This file documents the GNU linker ld.
+
+* Menu:
+
+* Overview:: Overview
+* Invocation:: Invocation
+* Commands:: Command Language
+
+* Machine Dependent:: Machine Dependent Features
+
+* BFD:: BFD
+
+* MRI:: MRI Compatible Script Files
+* Index:: Index
+
+
+File: ld.info, Node: Overview, Next: Invocation, Prev: Top, Up: Top
+
+Overview
+********
+
+ `ld' combines a number of object and archive files, relocates their
+data and ties up symbol references. Usually the last step in compiling
+a program is to run `ld'.
+
+ `ld' accepts Linker Command Language files written in a superset of
+AT&T's Link Editor Command Language syntax, to provide explicit and
+total control over the linking process.
+
+ This version of `ld' uses the general purpose BFD libraries to
+operate on object files. This allows `ld' to read, combine, and write
+object files in many different formats--for example, COFF or `a.out'.
+Different formats may be linked together to produce any available kind
+of object file. *Note BFD:: for a list of formats supported on various
+architectures.
+
+ Aside from its flexibility, the GNU linker is more helpful than other
+linkers in providing diagnostic information. Many linkers abandon
+execution immediately upon encountering an error; whenever possible,
+`ld' continues executing, allowing you to identify other errors (or, in
+some cases, to get an output file in spite of the error).
+
+
+File: ld.info, Node: Invocation, Next: Commands, Prev: Overview, Up: Top
+
+Invocation
+**********
+
+ The GNU linker `ld' is meant to cover a broad range of situations,
+and to be as compatible as possible with other linkers. As a result,
+you have many choices to control its behavior.
+
+* Menu:
+
+* Options:: Command Line Options
+* Environment:: Environment Variables
+
+
+File: ld.info, Node: Options, Next: Environment, Up: Invocation
+
+Command Line Options
+====================
+
+ Here is a summary of the options you can use on the `ld' command
+line:
+
+ ld [ -o OUTPUT ] OBJFILE...
+ [ -AARCHITECTURE ] [ -b INPUT-FORMAT ] [ -Bstatic ]
+ [ -c MRI-COMMANDFILE ] [ -d | -dc | -dp ]
+ [ -defsym SYMBOL=EXPRESSION ]
+ [ -e ENTRY ] [ -F ] [ -F FORMAT ]
+ [ -format INPUT-FORMAT ] [ -g ] [ -G SIZE ] [ --help ] [ -i ]
+ [ -lARCHIVE ] [ -LSEARCHDIR ] [ -M ] [ -Map MAPFILE ]
+ [ -m EMULATION ] [ -N | -n ] [ -noinhibit-exec ]
+ [ -oformat OUTPUT-FORMAT ] [ -R FILENAME ] [ -relax ]
+ [ -r | -Ur ] [ -S ] [ -s ] [ -sort-common ] [ -T COMMANDFILE ]
+ [ -Ttext ORG ] [ -Tdata ORG ]
+ [ -Tbss ORG ] [ -t ] [ -u SYMBOL] [-V] [-v] [ --version ]
+ [ -warn-common ] [ -ySYMBOL ] [ -X ] [-x ]
+
+ This plethora of command-line options may seem intimidating, but in
+actual practice few of them are used in any particular context. For
+instance, a frequent use of `ld' is to link standard Unix object files
+on a standard, supported Unix system. On such a system, to link a file
+`hello.o':
+
+ ld -o OUTPUT /lib/crt0.o hello.o -lc
+
+ This tells `ld' to produce a file called OUTPUT as the result of
+linking the file `/lib/crt0.o' with `hello.o' and the library `libc.a',
+which will come from the standard search directories. (See the
+discussion of the `-l' option below.)
+
+ The command-line options to `ld' may be specified in any order, and
+may be repeated at will. Repeating most options with a different
+argument will either have no further effect, or override prior
+occurrences (those further to the left on the command line) of that
+option.
+
+ The exceptions--which may meaningfully be used more than once--are
+`-A', `-b' (or its synonym `-format'), `-defsym', `-L', `-l', `-R', and
+`-u'.
+
+ The list of object files to be linked together, shown as OBJFILE...,
+may follow, precede, or be mixed in with command-line options, except
+that an OBJFILE argument may not be placed between an option and its
+argument.
+
+ Usually the linker is invoked with at least one object file, but you
+can specify other forms of binary input files using `-l', `-R', and the
+script command language. If *no* binary input files at all are
+specified, the linker does not produce any output, and issues the
+message `No input files'.
+
+ Option arguments must either follow the option letter without
+intervening whitespace, or be given as separate arguments immediately
+following the option that requires them.
+
+`-AARCHITECTURE'
+ In the current release of `ld', this option is useful only for the
+ Intel 960 family of architectures. In that `ld' configuration, the
+ ARCHITECTURE argument identifies the particular architecture in
+ the 960 family, enabling some safeguards and modifying the
+ archive-library search path. *Note `ld' and the Intel 960 family:
+ i960, for details.
+
+ Future releases of `ld' may support similar functionality for
+ other architecture families.
+
+`-b INPUT-FORMAT'
+ Specify the binary format for input object files that follow this
+ option on the command line. You don't usually need to specify
+ this, as `ld' is configured to expect as a default input format
+ the most usual format on each machine. INPUT-FORMAT is a text
+ string, the name of a particular format supported by the BFD
+ libraries. (You can list the available binary formats with
+ `objdump -i'.) `-format INPUT-FORMAT' has the same effect, as does
+ the script command `TARGET'. *Note BFD::.
+
+ You may want to use this option if you are linking files with an
+ unusual binary format. You can also use `-b' to switch formats
+ explicitly (when linking object files of different formats), by
+ including `-b INPUT-FORMAT' before each group of object files in a
+ particular format.
+
+ The default format is taken from the environment variable
+ `GNUTARGET'. *Note Environment::. You can also define the input
+ format from a script, using the command `TARGET'; see *Note Option
+ Commands::.
+
+`-Bstatic'
+ Ignored. This option is accepted for command-line compatibility
+ with the SunOS linker.
+
+`-c MRI-COMMANDFILE'
+ For compatibility with linkers produced by MRI, `ld' accepts script
+ files written in an alternate, restricted command language,
+ described in *Note MRI Compatible Script Files: MRI. Introduce
+ MRI script files with the option `-c'; use the `-T' option to run
+ linker scripts written in the general-purpose `ld' scripting
+ language. If MRI-CMDFILE does not exist, `ld' looks for it in the
+ directories specified by any `-L' options.
+
+`-d'
+`-dc'
+`-dp'
+ These three options are equivalent; multiple forms are supported
+ for compatibility with other linkers. They assign space to common
+ symbols even if a relocatable output file is specified (with
+ `-r'). The script command `FORCE_COMMON_ALLOCATION' has the same
+ effect. *Note Option Commands::.
+
+`-defsym SYMBOL=EXPRESSION'
+ Create a global symbol in the output file, containing the absolute
+ address given by EXPRESSION. You may use this option as many
+ times as necessary to define multiple symbols in the command line.
+ A limited form of arithmetic is supported for the EXPRESSION in
+ this context: you may give a hexadecimal constant or the name of
+ an existing symbol, or use `+' and `-' to add or subtract
+ hexadecimal constants or symbols. If you need more elaborate
+ expressions, consider using the linker command language from a
+ script (*note Assignment: Symbol Definitions: Assignment.).
+ *Note:* there should be no white space between SYMBOL, the equals
+ sign ("="), and EXPRESSION.
+
+`-e ENTRY'
+ Use ENTRY as the explicit symbol for beginning execution of your
+ program, rather than the default entry point. *Note Entry Point::,
+ for a discussion of defaults and other ways of specifying the
+ entry point.
+
+`-F'
+`-FFORMAT'
+ Ignored. Some older linkers used this option throughout a
+ compilation toolchain for specifying object-file format for both
+ input and output object files. The mechanisms `ld' uses for this
+ purpose (the `-b' or `-format' options for input files, `-oformat'
+ option or the `TARGET' command in linker scripts for output files,
+ the `GNUTARGET' environment variable) are more flexible, but `ld'
+ accepts the `-F' option for compatibility with scripts written to
+ call the old linker.
+
+`-format INPUT-FORMAT'
+ Synonym for `-b INPUT-FORMAT'.
+
+`-g'
+ Ignored. Provided for compatibility with other tools.
+
+`-GVALUE'
+`-G VALUE'
+ Set the maximum size of objects to be optimized using the GP
+ register to SIZE under MIPS ECOFF. Ignored for other object file
+ formats.
+
+`--help'
+ Print a summary of the command-line options on the standard output
+ and exit. This option and `--version' begin with two dashes
+ instead of one for compatibility with other GNU programs. The
+ other options start with only one dash for compatibility with
+ other linkers.
+
+`-i'
+ Perform an incremental link (same as option `-r').
+
+`-lAR'
+ Add archive file ARCHIVE to the list of files to link. This
+ option may be used any number of times. `ld' will search its
+ path-list for occurrences of `libAR.a' for every ARCHIVE specified.
+
+`-LSEARCHDIR'
+`-L SEARCHDIR'
+ Add path SEARCHDIR to the list of paths that `ld' will search for
+ archive libraries and `ld' control scripts. You may use this
+ option any number of times.
+
+ The default set of paths searched (without being specified with
+ `-L') depends on which emulation mode `ld' is using, and in some
+ cases also on how it was configured. *Note Environment::.
+
+ The paths can also be specified in a link script with the
+ `SEARCH_DIR' command.
+
+`-M'
+ Print (to the standard output) a link map--diagnostic information
+ about where symbols are mapped by `ld', and information on global
+ common storage allocation.
+
+`-Map MAPFILE'
+ Print to the file MAPFILE a link map--diagnostic information about
+ where symbols are mapped by `ld', and information on global common
+ storage allocation.
+
+`-mEMULATION'
+`-m EMULATION'
+ Emulate the EMULATION linker. You can list the available
+ emulations with the `-V' option. The default is the system for
+ which you configured `ld'.
+
+`-N'
+ Set the text and data sections to be readable and writable. Also,
+ do not page-align the data segment. If the output format supports
+ Unix style magic numbers, mark the output as `OMAGIC'.
+
+`-n'
+ Set the text segment to be read only, and mark the output as
+ `NMAGIC' if possible.
+
+`-noinhibit-exec'
+ Retain the executable output file whenever it is still usable.
+ Normally, the linker will not produce an output file if it
+ encounters errors during the link process; it exits without
+ writing an output file when it issues any error whatsoever.
+
+`-o OUTPUT'
+ Use OUTPUT as the name for the program produced by `ld'; if this
+ option is not specified, the name `a.out' is used by default. The
+ script command `OUTPUT' can also specify the output file name.
+
+`-oformat OUTPUT-FORMAT'
+ Specify the binary format for the output object file. You don't
+ usually need to specify this, as `ld' is configured to produce as
+ a default output format the most usual format on each machine.
+ oUTPUT-FORMAT is a text string, the name of a particular format
+ supported by the BFD libraries. (You can list the available binary
+ formats with `objdump -i'.) The script command `OUTPUT_FORMAT'
+ can also specify the output format, but this option overrides it.
+ *Note BFD::.
+
+`-R FILENAME'
+ Read symbol names and their addresses from FILENAME, but do not
+ relocate it or include it in the output. This allows your output
+ file to refer symbolically to absolute locations of memory defined
+ in other programs.
+
+`-relax'
+ An option with machine dependent effects. Currently this option
+ is only supported on the H8/300. *Note `ld' and the H8/300:
+ H8/300.
+
+ On some platforms, use option performs global optimizations that
+ become possible when the linker resolves addressing in the
+ program, such as relaxing address modes and synthesizing new
+ instructions in the output object file.
+
+ On platforms where this is not supported, `-relax' is accepted, but
+ ignored.
+
+`-r'
+ Generate relocatable output--i.e., generate an output file that
+ can in turn serve as input to `ld'. This is often called "partial
+ linking". As a side effect, in environments that support standard
+ Unix magic numbers, this option also sets the output file's magic
+ number to `OMAGIC'. If this option is not specified, an absolute
+ file is produced. When linking C++ programs, this option *will
+ not* resolve references to constructors; to do that, use `-Ur'.
+
+ This option does the same thing as `-i'.
+
+`-S'
+ Omit debugger symbol information (but not all symbols) from the
+ output file.
+
+`-s'
+ Omit all symbol information from the output file.
+
+`-sort-common'
+ Normally, when `ld' places the global common symbols in the
+ appropriate output sections, it sorts them by size. First come
+ all the one byte symbols, then all the two bytes, then all the
+ four bytes, and then everything else. This is to prevent gaps
+ between symbols due to alignment constraints. This option
+ disables that sorting.
+
+`-Tbss ORG'
+`-Tdata ORG'
+`-Ttext ORG'
+ Use ORG as the starting address for--respectively--the `bss',
+ `data', or the `text' segment of the output file. ORG must be a
+ single hexadecimal integer; for compatibility with other linkers,
+ you may omit the leading `0x' usually associated with hexadecimal
+ values.
+
+`-T COMMANDFILE'
+`-TCOMMANDFILE'
+ Read link commands from the file COMMANDFILE. These commands
+ completely override `ld''s default link format (rather than adding
+ to it); COMMANDFILE must specify everything necessary to describe
+ the target format. *Note Commands::. If COMMANDFILE does not
+ exist, `ld' looks for it in the directories specified by any
+ preceding `-L' options. Multiple `-T' options accumulate.
+
+`-t'
+ Print the names of the input files as `ld' processes them.
+
+`-u SYMBOL'
+ Force SYMBOL to be entered in the output file as an undefined
+ symbol. Doing this may, for example, trigger linking of
+ additional modules from standard libraries. `-u' may be repeated
+ with different option arguments to enter additional undefined
+ symbols.
+
+`-Ur'
+ For anything other than C++ programs, this option is equivalent to
+ `-r': it generates relocatable output--i.e., an output file that
+ can in turn serve as input to `ld'. When linking C++ programs,
+ `-Ur' *will* resolve references to constructors, unlike `-r'. It
+ does not work to use `-Ur' on files that were themselves linked
+ with `-Ur'; once the constructor table has been built, it can not
+ be added to. Use `-Ur' only for the last partial link, and `-r'
+ for the others.
+
+`-V'
+ Display the version number for `ld' and list the supported
+ emulations. Display which input files can and can not be opened.
+
+`-v'
+ Display the version number for `ld'.
+
+`--version'
+ Display the version number for `ld' and exit.
+
+`-warn-common'
+ Warn when a common symbol is combined with another common symbol
+ or with a symbol definition. Unix linkers allow this somewhat
+ sloppy practice, but linkers on some other operating systems do
+ not. This option allows you to find potential problems from
+ combining global symbols. Unfortunately, some C libraries use
+ this practice, so you may get some warnings about symbols in the
+ libraries as well as in your programs.
+
+ There are three kinds of global symbols, illustrated here by C
+ examples:
+
+ `int i = 1;'
+ A definition, which goes in the initialized data section of
+ the output file.
+
+ `extern int i;'
+ An undefined reference, which does not allocate space. There
+ must be either a definition or a common symbol for the
+ variable somewhere.
+
+ `int i;'
+ A common symbol. If there are only (one or more) common
+ symbols for a variable, it goes in the uninitialized data
+ area of the output file. The linker merges multiple common
+ symbols for the same variable into a single symbol. If they
+ are of different sizes, it picks the largest size. The
+ linker turns a common symbol into a declaration, if there is
+ a definition of the same variable.
+
+ The `-warn-common' option can produce five kinds of warnings. Each
+ warning consists of a pair of lines: the first describes the
+ symbol just encountered, and the second describes the previous
+ symbol encountered with the same name. One or both of the two
+ symbols will be a common symbol.
+
+ 1. Turning a common symbol into a reference, because there is
+ already a definition for the symbol.
+ FILE(SECTION): warning: common of `SYMBOL'
+ overridden by definition
+ FILE(SECTION): warning: defined here
+
+ 2. Turning a common symbol into a reference, because a later
+ definition for the symbol is encountered. This is the same
+ as the previous case, except that the symbols are encountered
+ in a different order.
+ FILE(SECTION): warning: definition of `SYMBOL'
+ overriding common
+ FILE(SECTION): warning: common is here
+
+ 3. Merging a common symbol with a previous same-sized common
+ symbol.
+ FILE(SECTION): warning: multiple common
+ of `SYMBOL'
+ FILE(SECTION): warning: previous common is here
+
+ 4. Merging a common symbol with a previous larger common symbol.
+ FILE(SECTION): warning: common of `SYMBOL'
+ overridden by larger common
+ FILE(SECTION): warning: larger common is here
+
+ 5. Merging a common symbol with a previous smaller common
+ symbol. This is the same as the previous case, except that
+ the symbols are encountered in a different order.
+ FILE(SECTION): warning: common of `SYMBOL'
+ overriding smaller common
+ FILE(SECTION): warning: smaller common is here
+
+`-X'
+ If `-s' or `-S' is also specified, delete only local symbols
+ beginning with `L'.
+
+`-x'
+ If `-s' or `-S' is also specified, delete all local symbols, not
+ just those beginning with `L'.
+
+`-ySYMBOL'
+ Print the name of each linked file in which SYMBOL appears. This
+ option may be given any number of times. On many systems it is
+ necessary to prepend an underscore.
+
+ This option is useful when you have an undefined symbol in your
+ link but don't know where the reference is coming from.
+
+
+File: ld.info, Node: Environment, Prev: Options, Up: Invocation
+
+Environment Variables
+=====================
+
+ You can change the behavior of `ld' with the environment variable
+`GNUTARGET'.
+
+ `GNUTARGET' determines the input-file object format if you don't use
+`-b' (or its synonym `-format'). Its value should be one of the BFD
+names for an input format (*note BFD::.). If there is no `GNUTARGET'
+in the environment, `ld' uses the natural format of the target. If
+`GNUTARGET' is set to `default' then BFD attempts to discover the input
+format by examining binary input files; this method often succeeds, but
+there are potential ambiguities, since there is no method of ensuring
+that the magic number used to specify object-file formats is unique.
+However, the configuration procedure for BFD on each system places the
+conventional format for that system first in the search-list, so
+ambiguities are resolved in favor of convention.
+
+
+File: ld.info, Node: Commands, Next: Machine Dependent, Prev: Invocation, Up: Top
+
+Command Language
+****************
+
+ The command language provides explicit control over the link process,
+allowing complete specification of the mapping between the linker's
+input files and its output. It controls:
+ * input files
+
+ * file formats
+
+ * output file layout
+
+ * addresses of sections
+
+ * placement of common blocks
+
+ You may supply a command file (also known as a link script) to the
+linker either explicitly through the `-T' option, or implicitly as an
+ordinary file. If the linker opens a file which it cannot recognize as
+a supported object or archive format, it reports an error.
+
+* Menu:
+
+* Scripts:: Linker Scripts
+* Expressions:: Expressions
+* MEMORY:: MEMORY Command
+* SECTIONS:: SECTIONS Command
+* Entry Point:: The Entry Point
+* Option Commands:: Option Commands
+
+
+File: ld.info, Node: Scripts, Next: Expressions, Up: Commands
+
+Linker Scripts
+==============
+
+ The `ld' command language is a collection of statements; some are
+simple keywords setting a particular option, some are used to select and
+group input files or name output files; and two statement types have a
+fundamental and pervasive impact on the linking process.
+
+ The most fundamental command of the `ld' command language is the
+`SECTIONS' command (*note SECTIONS::.). Every meaningful command
+script must have a `SECTIONS' command: it specifies a "picture" of the
+output file's layout, in varying degrees of detail. No other command
+is required in all cases.
+
+ The `MEMORY' command complements `SECTIONS' by describing the
+available memory in the target architecture. This command is optional;
+if you don't use a `MEMORY' command, `ld' assumes sufficient memory is
+available in a contiguous block for all output. *Note MEMORY::.
+
+ You may include comments in linker scripts just as in C: delimited
+by `/*' and `*/'. As in C, comments are syntactically equivalent to
+whitespace.
+
+
+File: ld.info, Node: Expressions, Next: MEMORY, Prev: Scripts, Up: Commands
+
+Expressions
+===========
+
+ Many useful commands involve arithmetic expressions. The syntax for
+expressions in the command language is identical to that of C
+expressions, with the following features:
+ * All expressions evaluated as integers and are of "long" or
+ "unsigned long" type.
+
+ * All constants are integers.
+
+ * All of the C arithmetic operators are provided.
+
+ * You may reference, define, and create global variables.
+
+ * You may call special purpose built-in functions.
+
+* Menu:
+
+* Integers:: Integers
+* Symbols:: Symbol Names
+* Location Counter:: The Location Counter
+* Operators:: Operators
+* Evaluation:: Evaluation
+* Assignment:: Assignment: Defining Symbols
+* Arithmetic Functions:: Built-In Functions
+
+
+File: ld.info, Node: Integers, Next: Symbols, Up: Expressions
+
+Integers
+--------
+
+ An octal integer is `0' followed by zero or more of the octal digits
+(`01234567').
+ _as_octal = 0157255;
+
+ A decimal integer starts with a non-zero digit followed by zero or
+more digits (`0123456789').
+ _as_decimal = 57005;
+
+ A hexadecimal integer is `0x' or `0X' followed by one or more
+hexadecimal digits chosen from `0123456789abcdefABCDEF'.
+ _as_hex = 0xdead;
+
+ To write a negative integer, use the prefix operator `-'; *note
+Operators::..
+ _as_neg = -57005;
+
+ Additionally the suffixes `K' and `M' may be used to scale a
+constant by `1024' or `1024*1024' respectively. For example, the
+following all refer to the same quantity:
+
+ _fourk_1 = 4K;
+ _fourk_2 = 4096;
+ _fourk_3 = 0x1000;
+
+
+File: ld.info, Node: Symbols, Next: Location Counter, Prev: Integers, Up: Expressions
+
+Symbol Names
+------------
+
+ Unless quoted, symbol names start with a letter, underscore, point or
+hyphen and may include any letters, underscores, digits, points, and
+minus signs. Unquoted symbol names must not conflict with any
+keywords. You can specify a symbol which contains odd characters or has
+the same name as a keyword, by surrounding the symbol name in double
+quotes:
+ "SECTION" = 9;
+ "with a space" = "also with a space" + 10;
+
+
+File: ld.info, Node: Location Counter, Next: Operators, Prev: Symbols, Up: Expressions
+
+The Location Counter
+--------------------
+
+ The special linker variable "dot" `.' always contains the current
+output location counter. Since the `.' always refers to a location in
+an output section, it must always appear in an expression within a
+`SECTIONS' command. The `.' symbol may appear anywhere that an ordinary
+symbol is allowed in an expression, but its assignments have a side
+effect. Assigning a value to the `.' symbol will cause the location
+counter to be moved. This may be used to create holes in the output
+section. The location counter may never be moved backwards.
+ SECTIONS
+ {
+ output :
+ {
+ file1(.text)
+ . = . + 1000;
+ file2(.text)
+ . += 1000;
+ file3(.text)
+ } = 0x1234;
+ }
+
+In the previous example, `file1' is located at the beginning of the
+output section, then there is a 1000 byte gap. Then `file2' appears,
+also with a 1000 byte gap following before `file3' is loaded. The
+notation `= 0x1234' specifies what data to write in the gaps (*note
+Section Options::.).
+
+
+File: ld.info, Node: Operators, Next: Evaluation, Prev: Location Counter, Up: Expressions
+
+Operators
+---------
+
+ The linker recognizes the standard C set of arithmetic operators,
+with the standard bindings and precedence levels:
+ precedence associativity Operators Notes
+ (highest)
+ 1 left ! - ~ (1)
+ 2 left * / %
+ 3 left + -
+ 4 left >> <<
+ 5 left == != > < <= >=
+ 6 left &
+ 7 left |
+ 8 left &&
+ 9 left ||
+ 10 right ? :
+ 11 right &= += -= *= /= (2)
+ (lowest)
+ Notes: (1) Prefix operators (2) *Note Assignment::
+
+
+File: ld.info, Node: Evaluation, Next: Assignment, Prev: Operators, Up: Expressions
+
+Evaluation
+----------
+
+ The linker uses "lazy evaluation" for expressions; it only calculates
+an expression when absolutely necessary. The linker needs the value of
+the start address, and the lengths of memory regions, in order to do any
+linking at all; these values are computed as soon as possible when the
+linker reads in the command file. However, other values (such as symbol
+values) are not known or needed until after storage allocation. Such
+values are evaluated later, when other information (such as the sizes of
+output sections) is available for use in the symbol assignment
+expression.
+
+
+File: ld.info, Node: Assignment, Next: Arithmetic Functions, Prev: Evaluation, Up: Expressions
+
+Assignment: Defining Symbols
+----------------------------
+
+ You may create global symbols, and assign values (addresses) to
+global symbols, using any of the C assignment operators:
+
+`SYMBOL = EXPRESSION ;'
+`SYMBOL &= EXPRESSION ;'
+`SYMBOL += EXPRESSION ;'
+`SYMBOL -= EXPRESSION ;'
+`SYMBOL *= EXPRESSION ;'
+`SYMBOL /= EXPRESSION ;'
+ Two things distinguish assignment from other operators in `ld'
+expressions.
+ * Assignment may only be used at the root of an expression; `a=b+3;'
+ is allowed, but `a+b=3;' is an error.
+
+ * You must place a trailing semicolon (";") at the end of an
+ assignment statement.
+
+ Assignment statements may appear:
+ * as commands in their own right in an `ld' script; or
+
+ * as independent statements within a `SECTIONS' command; or
+
+ * as part of the contents of a section definition in a `SECTIONS'
+ command.
+
+ The first two cases are equivalent in effect--both define a symbol
+with an absolute address. The last case defines a symbol whose address
+is relative to a particular section (*note SECTIONS::.).
+
+ When a linker expression is evaluated and assigned to a variable, it
+is given either an absolute or a relocatable type. An absolute
+expression type is one in which the symbol contains the value that it
+will have in the output file; a relocatable expression type is one in
+which the value is expressed as a fixed offset from the base of a
+section.
+
+ The type of the expression is controlled by its position in the
+script file. A symbol assigned within a section definition is created
+relative to the base of the section; a symbol assigned in any other
+place is created as an absolute symbol. Since a symbol created within a
+section definition is relative to the base of the section, it will
+remain relocatable if relocatable output is requested. A symbol may be
+created with an absolute value even when assigned to within a section
+definition by using the absolute assignment function `ABSOLUTE'. For
+example, to create an absolute symbol whose address is the last byte of
+an output section named `.data':
+ SECTIONS{ ...
+ .data :
+ {
+ *(.data)
+ _edata = ABSOLUTE(.) ;
+ }
+ ... }
+
+ The linker tries to put off the evaluation of an assignment until all
+the terms in the source expression are known (*note Evaluation::.). For
+instance, the sizes of sections cannot be known until after allocation,
+so assignments dependent upon these are not performed until after
+allocation. Some expressions, such as those depending upon the location
+counter "dot", `.' must be evaluated during allocation. If the result
+of an expression is required, but the value is not available, then an
+error results. For example, a script like the following
+ SECTIONS { ...
+ text 9+this_isnt_constant :
+ { ...
+ }
+ ... }
+
+will cause the error message "`Non constant expression for initial
+address'".
+
+
+File: ld.info, Node: Arithmetic Functions, Prev: Assignment, Up: Expressions
+
+Arithmetic Functions
+--------------------
+
+ The command language includes a number of built-in functions for use
+in link script expressions.
+`ABSOLUTE(EXP)'
+ Return the absolute (non-relocatable, as opposed to non-negative)
+ value of the expression EXP. Primarily useful to assign an
+ absolute value to a symbol within a section definition, where
+ symbol values are normally section-relative.
+
+`ADDR(SECTION)'
+ Return the absolute address of the named SECTION. Your script must
+ previously have defined the location of that section. In the
+ following example, `symbol_1' and `symbol_2' are assigned identical
+ values:
+ SECTIONS{ ...
+ .output1 :
+ {
+ start_of_output_1 = ABSOLUTE(.);
+ ...
+ }
+ .output :
+ {
+ symbol_1 = ADDR(.output1);
+ symbol_2 = start_of_output_1;
+ }
+ ... }
+
+`ALIGN(EXP)'
+ Return the result of the current location counter (`.') aligned to
+ the next EXP boundary. EXP must be an expression whose value is a
+ power of two. This is equivalent to
+ (. + EXP - 1) & ~(EXP - 1)
+
+ `ALIGN' doesn't change the value of the location counter--it just
+ does arithmetic on it. As an example, to align the output `.data'
+ section to the next `0x2000' byte boundary after the preceding
+ section and to set a variable within the section to the next
+ `0x8000' boundary after the input sections:
+ SECTIONS{ ...
+ .data ALIGN(0x2000): {
+ *(.data)
+ variable = ALIGN(0x8000);
+ }
+ ... }
+
+ The first use of `ALIGN' in this example specifies the location of
+ a section because it is used as the optional START attribute of a
+ section definition (*note Section Options::.). The second use
+ simply defines the value of a variable.
+
+ The built-in `NEXT' is closely related to `ALIGN'.
+
+`DEFINED(SYMBOL)'
+ Return 1 if SYMBOL is in the linker global symbol table and is
+ defined, otherwise return 0. You can use this function to provide
+ default values for symbols. For example, the following
+ command-file fragment shows how to set a global symbol `begin' to
+ the first location in the `.text' section--but if a symbol called
+ `begin' already existed, its value is preserved:
+ SECTIONS{ ...
+ .text : {
+ begin = DEFINED(begin) ? begin : . ;
+ ...
+ }
+ ... }
+
+`NEXT(EXP)'
+ Return the next unallocated address that is a multiple of EXP.
+ This function is closely related to `ALIGN(EXP)'; unless you use
+ the `MEMORY' command to define discontinuous memory for the output
+ file, the two functions are equivalent.
+
+`SIZEOF(SECTION)'
+ Return the size in bytes of the named SECTION, if that section has
+ been allocated. In the following example, `symbol_1' and
+ `symbol_2' are assigned identical values:
+ SECTIONS{ ...
+ .output {
+ .start = . ;
+ ...
+ .end = . ;
+ }
+ symbol_1 = .end - .start ;
+ symbol_2 = SIZEOF(.output);
+ ... }
+
+`SIZEOF_HEADERS'
+`sizeof_headers'
+ Return the size in bytes of the output file's headers. You can
+ use this number as the start address of the first section, if you
+ choose, to facilitate paging.
+
+
+File: ld.info, Node: MEMORY, Next: SECTIONS, Prev: Expressions, Up: Commands
+
+Memory Layout
+=============
+
+ The linker's default configuration permits allocation of all
+available memory. You can override this configuration by using the
+`MEMORY' command. The `MEMORY' command describes the location and size
+of blocks of memory in the target. By using it carefully, you can
+describe which memory regions may be used by the linker, and which
+memory regions it must avoid. The linker does not shuffle sections to
+fit into the available regions, but does move the requested sections
+into the correct regions and issue errors when the regions become too
+full.
+
+ A command file may contain at most one use of the `MEMORY' command;
+however, you can define as many blocks of memory within it as you wish.
+The syntax is:
+
+ MEMORY
+ {
+ NAME (ATTR) : ORIGIN = ORIGIN, LENGTH = LEN
+ ...
+ }
+
+`NAME'
+ is a name used internally by the linker to refer to the region. Any
+ symbol name may be used. The region names are stored in a separate
+ name space, and will not conflict with symbols, file names or
+ section names. Use distinct names to specify multiple regions.
+
+`(ATTR)'
+ is an optional list of attributes, permitted for compatibility
+ with the AT&T linker but not used by `ld' beyond checking that the
+ attribute list is valid. Valid attribute lists must be made up of
+ the characters "`LIRWX'". If you omit the attribute list, you may
+ omit the parentheses around it as well.
+
+`ORIGIN'
+ is the start address of the region in physical memory. It is an
+ expression that must evaluate to a constant before memory
+ allocation is performed. The keyword `ORIGIN' may be abbreviated
+ to `org' or `o' (but not, for example, `ORG').
+
+`LEN'
+ is the size in bytes of the region (an expression). The keyword
+ `LENGTH' may be abbreviated to `len' or `l'.
+
+ For example, to specify that memory has two regions available for
+allocation--one starting at 0 for 256 kilobytes, and the other starting
+at `0x40000000' for four megabytes:
+
+ MEMORY
+ {
+ rom : ORIGIN = 0, LENGTH = 256K
+ ram : org = 0x40000000, l = 4M
+ }
+
+ Once you have defined a region of memory named MEM, you can direct
+specific output sections there by using a command ending in `>MEM'
+within the `SECTIONS' command (*note Section Options::.). If the
+combined output sections directed to a region are too big for the
+region, the linker will issue an error message.
+
+
+File: ld.info, Node: SECTIONS, Next: Entry Point, Prev: MEMORY, Up: Commands
+
+Specifying Output Sections
+==========================
+
+ The `SECTIONS' command controls exactly where input sections are
+placed into output sections, their order in the output file, and to
+which output sections they are allocated.
+
+ You may use at most one `SECTIONS' command in a script file, but you
+can have as many statements within it as you wish. Statements within
+the `SECTIONS' command can do one of three things:
+ * define the entry point;
+
+ * assign a value to a symbol;
+
+ * describe the placement of a named output section, and which input
+ sections go into it.
+
+ You can also use the first two operations--defining the entry point
+and defining symbols--outside the `SECTIONS' command: *note Entry
+Point::., and *note Assignment::.. They are permitted here as well for
+your convenience in reading the script, so that symbols and the entry
+point can be defined at meaningful points in your output-file layout.
+
+ When no `SECTIONS' command is given, the linker places each input
+section into an identically named output section in the order that the
+sections are first encountered in the input files. If all input
+sections are present in the first file, for example, the order of
+sections in the output file will match the order in the first input
+file.
+
+* Menu:
+
+* Section Definition:: Section Definitions
+* Section Placement:: Section Placement
+* Section Data Expressions:: Section Data Expressions
+* Section Options:: Optional Section Attributes
+
+
+File: ld.info, Node: Section Definition, Next: Section Placement, Up: SECTIONS
+
+Section Definitions
+-------------------
+
+ The most frequently used statement in the `SECTIONS' command is the
+"section definition", which specifies the properties of an output
+section: its location, alignment, contents, fill pattern, and target
+memory region. Most of these specifications are optional; the simplest
+form of a section definition is
+ SECTIONS { ...
+ SECNAME : {
+ CONTENTS
+ }
+ ... }
+
+SECNAME is the name of the output section, and CONTENTS a specification
+of what goes there--for example, a list of input files or sections of
+input files (*note Section Placement::.). As you might assume, the
+whitespace shown is optional. You do need the colon `:' and the braces
+`{}', however.
+
+ SECNAME must meet the constraints of your output format. In formats
+which only support a limited number of sections, such as `a.out', the
+name must be one of the names supported by the format (`a.out', for
+example, allows only `.text', `.data' or `.bss'). If the output format
+supports any number of sections, but with numbers and not names (as is
+the case for Oasys), the name should be supplied as a quoted numeric
+string. A section name may consist of any sequence of characters, but
+any name which does not conform to the standard `ld' symbol name syntax
+must be quoted. *Note Symbol Names: Symbols.
+
+
+File: ld.info, Node: Section Placement, Next: Section Data Expressions, Prev: Section Definition, Up: SECTIONS
+
+Section Placement
+-----------------
+
+ In a section definition, you can specify the contents of an output
+section by listing particular input files, by listing particular
+input-file sections, or by a combination of the two. You can also
+place arbitrary data in the section, and define symbols relative to the
+beginning of the section.
+
+ The CONTENTS of a section definition may include any of the
+following kinds of statement. You can include as many of these as you
+like in a single section definition, separated from one another by
+whitespace.
+
+`FILENAME'
+ You may simply name a particular input file to be placed in the
+ current output section; *all* sections from that file are placed
+ in the current section definition. If the file name has already
+ been mentioned in another section definition, with an explicit
+ section name list, then only those sections which have not yet
+ been allocated are used.
+
+ To specify a list of particular files by name:
+ .data : { afile.o bfile.o cfile.o }
+
+ The example also illustrates that multiple statements can be
+ included in the contents of a section definition, since each file
+ name is a separate statement.
+
+`FILENAME( SECTION )'
+`FILENAME( SECTION, SECTION, ... )'
+`FILENAME( SECTION SECTION ... )'
+ You can name one or more sections from your input files, for
+ insertion in the current output section. If you wish to specify a
+ list of input-file sections inside the parentheses, you may
+ separate the section names by either commas or whitespace.
+
+`* (SECTION)'
+`* (SECTION, SECTION, ...)'
+`* (SECTION SECTION ...)'
+ Instead of explicitly naming particular input files in a link
+ control script, you can refer to *all* files from the `ld' command
+ line: use `*' instead of a particular file name before the
+ parenthesized input-file section list.
+
+ If you have already explicitly included some files by name, `*'
+ refers to all *remaining* files--those whose places in the output
+ file have not yet been defined.
+
+ For example, to copy sections `1' through `4' from an Oasys file
+ into the `.text' section of an `a.out' file, and sections `13' and
+ `14' into the `.data' section:
+ SECTIONS {
+ .text :{
+ *("1" "2" "3" "4")
+ }
+
+ .data :{
+ *("13" "14")
+ }
+ }
+
+ `[ SECTION ... ]' used to be accepted as an alternate way to
+ specify named sections from all unallocated input files. Because
+ some operating systems (VMS) allow brackets in file names, that
+ notation is no longer supported.
+
+`FILENAME`( COMMON )''
+`*( COMMON )'
+ Specify where in your output file to place uninitialized data with
+ this notation. `*(COMMON)' by itself refers to all uninitialized
+ data from all input files (so far as it is not yet allocated);
+ FILENAME`(COMMON)' refers to uninitialized data from a particular
+ file. Both are special cases of the general mechanisms for
+ specifying where to place input-file sections: `ld' permits you to
+ refer to uninitialized data as if it were in an input-file section
+ named `COMMON', regardless of the input file's format.
+
+ For example, the following command script arranges the output file
+into three consecutive sections, named `.text', `.data', and `.bss',
+taking the input for each from the correspondingly named sections of
+all the input files:
+ SECTIONS {
+ .text : { *(.text) }
+ .data : { *(.data) }
+ .bss : { *(.bss) *(COMMON) }
+ }
+
+ The following example reads all of the sections from file `all.o'
+and places them at the start of output section `outputa' which starts
+at location `0x10000'. All of section `.input1' from file `foo.o'
+follows immediately, in the same output section. All of section
+`.input2' from `foo.o' goes into output section `outputb', followed by
+section `.input1' from `foo1.o'. All of the remaining `.input1' and
+`.input2' sections from any files are written to output section
+`outputc'.
+
+ SECTIONS {
+ outputa 0x10000 :
+ {
+ all.o
+ foo.o (.input1)
+ }
+ outputb :
+ {
+ foo.o (.input2)
+ foo1.o (.input1)
+ }
+ outputc :
+ {
+ *(.input1)
+ *(.input2)
+ }
+ }
+
+
+File: ld.info, Node: Section Data Expressions, Next: Section Options, Prev: Section Placement, Up: SECTIONS
+
+Section Data Expressions
+------------------------
+
+ The foregoing statements arrange, in your output file, data
+originating from your input files. You can also place data directly in
+an output section from the link command script. Most of these
+additional statements involve expressions; *note Expressions::..
+Although these statements are shown separately here for ease of
+presentation, no such segregation is needed within a section definition
+in the `SECTIONS' command; you can intermix them freely with any of the
+statements we've just described.
+
+`CREATE_OBJECT_SYMBOLS'
+ Create a symbol for each input file in the current section, set to
+ the address of the first byte of data written from that input
+ file. For instance, with `a.out' files it is conventional to have
+ a symbol for each input file. You can accomplish this by defining
+ the output `.text' section as follows:
+ SECTIONS {
+ .text 0x2020 :
+ {
+ CREATE_OBJECT_SYMBOLS
+ *(.text)
+ _etext = ALIGN(0x2000);
+ }
+ ...
+ }
+
+ If `sample.ld' is a file containing this script, and `a.o', `b.o',
+ `c.o', and `d.o' are four input files with contents like the
+ following--
+ /* a.c */
+
+ afunction() { }
+ int adata=1;
+ int abss;
+
+ `ld -M -T sample.ld a.o b.o c.o d.o' would create a map like this,
+ containing symbols matching the object file names:
+ 00000000 A __DYNAMIC
+ 00004020 B _abss
+ 00004000 D _adata
+ 00002020 T _afunction
+ 00004024 B _bbss
+ 00004008 D _bdata
+ 00002038 T _bfunction
+ 00004028 B _cbss
+ 00004010 D _cdata
+ 00002050 T _cfunction
+ 0000402c B _dbss
+ 00004018 D _ddata
+ 00002068 T _dfunction
+ 00004020 D _edata
+ 00004030 B _end
+ 00004000 T _etext
+ 00002020 t a.o
+ 00002038 t b.o
+ 00002050 t c.o
+ 00002068 t d.o
+
+`SYMBOL = EXPRESSION ;'
+`SYMBOL F= EXPRESSION ;'
+ SYMBOL is any symbol name (*note Symbols::.). "F=" refers to any
+ of the operators `&= += -= *= /=' which combine arithmetic and
+ assignment.
+
+ When you assign a value to a symbol within a particular section
+ definition, the value is relative to the beginning of the section
+ (*note Assignment::.). If you write
+ SECTIONS {
+ abs = 14 ;
+ ...
+ .data : { ... rel = 14 ; ... }
+ abs2 = 14 + ADDR(.data);
+ ...
+ }
+
+ `abs' and `rel' do not have the same value; `rel' has the same
+ value as `abs2'.
+
+`BYTE(EXPRESSION)'
+`SHORT(EXPRESSION)'
+`LONG(EXPRESSION)'
+ By including one of these three statements in a section
+ definition, you can explicitly place one, two, or four bytes
+ (respectively) at the current address of that section.
+
+ Multiple-byte quantities are represented in whatever byte order is
+ appropriate for the output file format (*note BFD::.).
+
+`FILL(EXPRESSION)'
+ Specify the "fill pattern" for the current section. Any otherwise
+ unspecified regions of memory within the section (for example,
+ regions you skip over by assigning a new value to the location
+ counter `.') are filled with the two least significant bytes from
+ the EXPRESSION argument. A `FILL' statement covers memory
+ locations *after* the point it occurs in the section definition; by
+ including more than one `FILL' statement, you can have different
+ fill patterns in different parts of an output section.
+
diff --git a/ld/ld.info-2 b/ld/ld.info-2
new file mode 100644
index 0000000..5a93f63
--- /dev/null
+++ b/ld/ld.info-2
@@ -0,0 +1,941 @@
+This is Info file ld.info, produced by Makeinfo-1.55 from the input
+file ./ld.texinfo.
+
+START-INFO-DIR-ENTRY
+* Ld:: The GNU linker.
+END-INFO-DIR-ENTRY
+
+ This file documents the GNU linker LD.
+
+ Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
+
+ Permission is granted to make and distribute verbatim copies of this
+manual provided the copyright notice and this permission notice are
+preserved on all copies.
+
+ Permission is granted to copy and distribute modified versions of
+this manual under the conditions for verbatim copying, provided also
+that the entire resulting derived work is distributed under the terms
+of a permission notice identical to this one.
+
+ Permission is granted to copy and distribute translations of this
+manual into another language, under the above conditions for modified
+versions.
+
+
+File: ld.info, Node: Section Options, Prev: Section Data Expressions, Up: SECTIONS
+
+Optional Section Attributes
+---------------------------
+
+ Here is the full syntax of a section definition, including all the
+optional portions:
+
+ SECTIONS {
+ ...
+ SECNAME START BLOCK(ALIGN) (NOLOAD) : { CONTENTS } =FILL >REGION
+ ...
+ }
+
+ SECNAME and CONTENTS are required. *Note Section Definition::, and
+*note Section Placement::. for details on CONTENTS. The remaining
+elements--START, `BLOCK(ALIGN)', `(NOLOAD)' `=FILL', and `>REGION'--are
+all optional.
+
+`START'
+ You can force the output section to be loaded at a specified
+ address by specifying START immediately following the section name.
+ sTART can be represented as any expression. The following example
+ generates section OUTPUT at location `0x40000000':
+ SECTIONS {
+ ...
+ output 0x40000000: {
+ ...
+ }
+ ...
+ }
+
+`BLOCK(ALIGN)'
+ You can include `BLOCK()' specification to advance the location
+ counter `.' prior to the beginning of the section, so that the
+ section will begin at the specified alignment. ALIGN is an
+ expression.
+
+`(NOLOAD)'
+ Use `(NOLOAD)' to prevent a section from being loaded into memory
+ each time it is accessed. For example, in the script sample
+ below, the `ROM' segment is addressed at memory location `0' and
+ does not need to be loaded into each object file:
+ SECTIONS {
+ ROM 0 (NOLOAD) : { ... }
+ ...
+ }
+
+`=FILL'
+ Including `=FILL' in a section definition specifies the initial
+ fill value for that section. You may use any expression to
+ specify FILL. Any unallocated holes in the current output section
+ when written to the output file will be filled with the two least
+ significant bytes of the value, repeated as necessary. You can
+ also change the fill value with a `FILL' statement in the CONTENTS
+ of a section definition.
+
+`>REGION'
+ Assign this section to a previously defined region of memory.
+ *Note MEMORY::.
+
+
+File: ld.info, Node: Entry Point, Next: Option Commands, Prev: SECTIONS, Up: Commands
+
+The Entry Point
+===============
+
+ The linker command language includes a command specifically for
+defining the first executable instruction in an output file (its "entry
+point"). Its argument is a symbol name:
+ ENTRY(SYMBOL)
+
+ Like symbol assignments, the `ENTRY' command may be placed either as
+an independent command in the command file, or among the section
+definitions within the `SECTIONS' command--whatever makes the most
+sense for your layout.
+
+ `ENTRY' is only one of several ways of choosing the entry point.
+You may indicate it in any of the following ways (shown in descending
+order of priority: methods higher in the list override methods lower
+down).
+ * the `-e' ENTRY command-line option;
+
+ * the `ENTRY(SYMBOL' command in a linker control script;
+
+ * the value of the symbol `start', if present;
+
+ * the value of the symbol `_main', if present;
+
+ * the address of the first byte of the `.text' section, if present;
+
+ * The address `0'.
+
+ For example, you can use these rules to generate an entry point with
+an assignment statement: if no symbol `start' is defined within your
+input files, you can simply define it, assigning it an appropriate
+value--
+ start = 0x2020;
+
+The example shows an absolute address, but you can use any expression.
+For example, if your input object files use some other symbol-name
+convention for the entry point, you can just assign the value of
+whatever symbol contains the start address to `start':
+ start = other_symbol ;
+
+
+File: ld.info, Node: Option Commands, Prev: Entry Point, Up: Commands
+
+Option Commands
+===============
+
+ The command language includes a number of other commands that you can
+use for specialized purposes. They are similar in purpose to
+command-line options.
+
+`FLOAT'
+`NOFLOAT'
+ These keywords were used in some older linkers to request a
+ particular math subroutine library. `ld' doesn't use the
+ keywords, assuming instead that any necessary subroutines are in
+ libraries specified using the general mechanisms for linking to
+ archives; but to permit the use of scripts that were written for
+ the older linkers, the keywords `FLOAT' and `NOFLOAT' are accepted
+ and ignored.
+
+`FORCE_COMMON_ALLOCATION'
+ This command has the same effect as the `-d' command-line option:
+ to make `ld' assign space to common symbols even if a relocatable
+ output file is specified (`-r').
+
+`INPUT ( FILE, FILE, ... )'
+`INPUT ( FILE FILE ... )'
+ Use this command to include binary input files in the link, without
+ including them in a particular section definition. Specify the
+ full name for each FILE, including `.a' if required.
+
+ `ld' searches for each FILE through the archive-library search
+ path, just as for files you specify on the command line. See the
+ description of `-L' in *Note Command Line Options: Options.
+
+`OUTPUT ( FILENAME )'
+ Use this command to name the link output file FILENAME. The
+ effect of `OUTPUT(FILENAME)' is identical to the effect of
+ `-o FILENAME', which overrides it. You can use this command to
+ supply a default output-file name other than `a.out'.
+
+`OUTPUT_ARCH ( BFDNAME )'
+ Specify a particular output machine architecture, with one of the
+ names used by the BFD back-end routines (*note BFD::.). This
+ command is often unnecessary; the architecture is most often set
+ implicitly by either the system BFD configuration or as a side
+ effect of the `OUTPUT_FORMAT' command.
+
+`OUTPUT_FORMAT ( BFDNAME )'
+ Specify a particular output format, with one of the names used by
+ the BFD back-end routines (*note BFD::.). The effect is identical
+ to the effect of the `-oformat' command-line option. This
+ selection will only affect the output file; the related command
+ `TARGET' affects primarily input files.
+
+`SEARCH_DIR ( PATH )'
+ Add PATH to the list of paths where `ld' looks for archive
+ libraries. `SEARCH_DIR(PATH)' has the same effect as `-LPATH' on
+ the command line.
+
+`STARTUP ( FILENAME )'
+ Ensure that FILENAME is the first input file used in the link
+ process.
+
+`TARGET ( FORMAT )'
+ Change the input-file object code format (like the command-line
+ option `-b' or its synonym `-format'). The argument FORMAT is one
+ of the strings used by BFD to name binary formats. If `TARGET' is
+ specified but `OUTPUT_FORMAT' is not, the last `TARGET' argument
+ is also used as the default format for the `ld' output file.
+ *Note BFD::.
+
+ If you don't use the `TARGET' command, `ld' uses the value of the
+ environment variable `GNUTARGET', if available, to select the
+ output file format. If that variable is also absent, `ld' uses
+ the default format configured for your machine in the BFD
+ libraries.
+
+
+File: ld.info, Node: Machine Dependent, Next: BFD, Prev: Commands, Up: Top
+
+Machine Dependent Features
+**************************
+
+ `ld' has additional features on some platforms; the following
+sections describe them. Machines where `ld' has no additional
+functionality are not listed.
+
+* Menu:
+
+* H8/300:: `ld' and the H8/300
+* i960:: `ld' and the Intel 960 family
+
+
+File: ld.info, Node: H8/300, Next: i960, Up: Machine Dependent
+
+`ld' and the H8/300
+===================
+
+ For the H8/300, `ld' can perform these global optimizations when you
+specify the `-relax' command-line option.
+
+*relaxing address modes*
+ `ld' finds all `jsr' and `jmp' instructions whose targets are
+ within eight bits, and turns them into eight-bit program-counter
+ relative `bsr' and `bra' instructions, respectively.
+
+*synthesizing instructions*
+ `ld' finds all `mov.b' instructions which use the sixteen-bit
+ absolute address form, but refer to the top page of memory, and
+ changes them to use the eight-bit address form. (That is: the
+ linker turns `mov.b `@'AA:16' into `mov.b `@'AA:8' whenever the
+ address AA is in the top page of memory).
+
+
+File: ld.info, Node: i960, Prev: H8/300, Up: Machine Dependent
+
+`ld' and the Intel 960 family
+=============================
+
+ You can use the `-AARCHITECTURE' command line option to specify one
+of the two-letter names identifying members of the 960 family; the
+option specifies the desired output target, and warns of any
+incompatible instructions in the input files. It also modifies the
+linker's search strategy for archive libraries, to support the use of
+libraries specific to each particular architecture, by including in the
+search loop names suffixed with the string identifying the architecture.
+
+ For example, if your `ld' command line included `-ACA' as well as
+`-ltry', the linker would look (in its built-in search paths, and in
+any paths you specify with `-L') for a library with the names
+
+ try
+ libtry.a
+ tryca
+ libtryca.a
+
+The first two possibilities would be considered in any event; the last
+two are due to the use of `-ACA'.
+
+ You can meaningfully use `-A' more than once on a command line, since
+the 960 architecture family allows combination of target architectures;
+each use will add another pair of name variants to search for when `-l'
+specifies a library.
+
+
+File: ld.info, Node: BFD, Next: MRI, Prev: Machine Dependent, Up: Top
+
+BFD
+***
+
+ The linker accesses object and archive files using the BFD libraries.
+These libraries allow the linker to use the same routines to operate on
+object files whatever the object file format. A different object file
+format can be supported simply by creating a new BFD back end and adding
+it to the library. You can use `objdump -i' (*note objdump:
+(binutils.info)objdump.) to list all the formats available for each
+architecture under BFD. This was the list of formats, and of
+architectures supported for each format, as of the time this manual was
+prepared:
+ BFD header file version 0.18
+ a.out-i386
+ (header big endian, data big endian)
+ m68k:68020
+ a29k
+ sparc
+ i386
+ a.out-sunos-big
+ (header big endian, data big endian)
+ m68k:68020
+ a29k
+ sparc
+ i386
+ b.out.big
+ (header big endian, data little endian)
+ i960:core
+ b.out.little
+ (header little endian, data little endian)
+ i960:core
+ coff-a29k-big
+ (header big endian, data big endian)
+ a29k
+ coff-h8300
+ (header big endian, data big endian)
+ H8/300
+ coff-i386
+ (header little endian, data little endian)
+ i386
+ coff-Intel-big
+ (header big endian, data little endian)
+ i960:core
+ coff-Intel-little
+ (header little endian, data little endian)
+ i960:core
+ coff-m68k
+ (header big endian, data big endian)
+ m68k:68020
+ coff-m88kbcs
+ (header big endian, data big endian)
+ m88k:88100
+ ecoff-bigmips
+ (header big endian, data big endian)
+ mips
+ ecoff-littlemips
+ (header little endian, data little endian)
+ mips
+ elf-big
+ (header big endian, data big endian)
+ m68k:68020
+ vax
+ i960:core
+ a29k
+ sparc
+ mips
+ i386
+ m88k:88100
+ H8/300
+ rs6000:6000
+ elf-little
+ (header little endian, data little endian)
+ m68k:68020
+ vax
+ i960:core
+ a29k
+ sparc
+ mips
+ i386
+ m88k:88100
+ H8/300
+ rs6000:6000
+ ieee
+ (header big endian, data big endian)
+ m68k:68020
+ vax
+ i960:core
+ a29k
+ sparc
+ mips
+ i386
+ m88k:88100
+ H8/300
+ rs6000:6000
+ srec
+ (header big endian, data big endian)
+ m68k:68020
+ vax
+ i960:core
+ a29k
+ sparc
+ mips
+ i386
+ m88k:88100
+ H8/300
+ rs6000:6000
+
+ As with most implementations, BFD is a compromise between several
+conflicting requirements. The major factor influencing BFD design was
+efficiency: any time used converting between formats is time which
+would not have been spent had BFD not been involved. This is partly
+offset by abstraction payback; since BFD simplifies applications and
+back ends, more time and care may be spent optimizing algorithms for a
+greater speed.
+
+ One minor artifact of the BFD solution which you should bear in mind
+is the potential for information loss. There are two places where
+useful information can be lost using the BFD mechanism: during
+conversion and during output. *Note BFD information loss::.
+
+* Menu:
+
+* BFD outline:: How it works: an outline of BFD
+
+
+File: ld.info, Node: BFD outline, Up: BFD
+
+How it works: an outline of BFD
+===============================
+
+ When an object file is opened, BFD subroutines automatically
+determine the format of the input object file. They then build a
+descriptor in memory with pointers to routines that will be used to
+access elements of the object file's data structures.
+
+ As different information from the the object files is required, BFD
+reads from different sections of the file and processes them. For
+example, a very common operation for the linker is processing symbol
+tables. Each BFD back end provides a routine for converting between
+the object file's representation of symbols and an internal canonical
+format. When the linker asks for the symbol table of an object file, it
+calls through a memory pointer to the routine from the relevant BFD
+back end which reads and converts the table into a canonical form. The
+linker then operates upon the canonical form. When the link is finished
+and the linker writes the output file's symbol table, another BFD back
+end routine is called to take the newly created symbol table and
+convert it into the chosen output format.
+
+* Menu:
+
+* BFD information loss:: Information Loss
+* Canonical format:: The BFD canonical object-file format
+
+
+File: ld.info, Node: BFD information loss, Next: Canonical format, Up: BFD outline
+
+Information Loss
+----------------
+
+ *Information can be lost during output.* The output formats
+supported by BFD do not provide identical facilities, and information
+which can be described in one form has nowhere to go in another format.
+One example of this is alignment information in `b.out'. There is
+nowhere in an `a.out' format file to store alignment information on the
+contained data, so when a file is linked from `b.out' and an `a.out'
+image is produced, alignment information will not propagate to the
+output file. (The linker will still use the alignment information
+internally, so the link is performed correctly).
+
+ Another example is COFF section names. COFF files may contain an
+unlimited number of sections, each one with a textual section name. If
+the target of the link is a format which does not have many sections
+(e.g., `a.out') or has sections without names (e.g., the Oasys format),
+the link cannot be done simply. You can circumvent this problem by
+describing the desired input-to-output section mapping with the linker
+command language.
+
+ *Information can be lost during canonicalization.* The BFD internal
+canonical form of the external formats is not exhaustive; there are
+structures in input formats for which there is no direct representation
+internally. This means that the BFD back ends cannot maintain all
+possible data richness through the transformation between external to
+internal and back to external formats.
+
+ This limitation is only a problem when an application reads one
+format and writes another. Each BFD back end is responsible for
+maintaining as much data as possible, and the internal BFD canonical
+form has structures which are opaque to the BFD core, and exported only
+to the back ends. When a file is read in one format, the canonical form
+is generated for BFD and the application. At the same time, the back
+end saves away any information which may otherwise be lost. If the data
+is then written back in the same format, the back end routine will be
+able to use the canonical form provided by the BFD core as well as the
+information it prepared earlier. Since there is a great deal of
+commonality between back ends, there is no information lost when
+linking or copying big endian COFF to little endian COFF, or `a.out' to
+`b.out'. When a mixture of formats is linked, the information is only
+lost from the files whose format differs from the destination.
+
+
+File: ld.info, Node: Canonical format, Prev: BFD information loss, Up: BFD outline
+
+The BFD canonical object-file format
+------------------------------------
+
+ The greatest potential for loss of information occurs when there is
+the least overlap between the information provided by the source
+format, that stored by the canonical format, and that needed by the
+destination format. A brief description of the canonical form may help
+you understand which kinds of data you can count on preserving across
+conversions.
+
+*files*
+ Information stored on a per-file basis includes target machine
+ architecture, particular implementation format type, a demand
+ pageable bit, and a write protected bit. Information like Unix
+ magic numbers is not stored here--only the magic numbers' meaning,
+ so a `ZMAGIC' file would have both the demand pageable bit and the
+ write protected text bit set. The byte order of the target is
+ stored on a per-file basis, so that big- and little-endian object
+ files may be used with one another.
+
+*sections*
+ Each section in the input file contains the name of the section,
+ the section's original address in the object file, size and
+ alignment information, various flags, and pointers into other BFD
+ data structures.
+
+*symbols*
+ Each symbol contains a pointer to the information for the object
+ file which originally defined it, its name, its value, and various
+ flag bits. When a BFD back end reads in a symbol table, it
+ relocates all symbols to make them relative to the base of the
+ section where they were defined. Doing this ensures that each
+ symbol points to its containing section. Each symbol also has a
+ varying amount of hidden private data for the BFD back end. Since
+ the symbol points to the original file, the private data format
+ for that symbol is accessible. `ld' can operate on a collection
+ of symbols of wildly different formats without problems.
+
+ Normal global and simple local symbols are maintained on output,
+ so an output file (no matter its format) will retain symbols
+ pointing to functions and to global, static, and common variables.
+ Some symbol information is not worth retaining; in `a.out', type
+ information is stored in the symbol table as long symbol names.
+ This information would be useless to most COFF debuggers; the
+ linker has command line switches to allow users to throw it away.
+
+ There is one word of type information within the symbol, so if the
+ format supports symbol type information within symbols (for
+ example, COFF, IEEE, Oasys) and the type is simple enough to fit
+ within one word (nearly everything but aggregates), the
+ information will be preserved.
+
+*relocation level*
+ Each canonical BFD relocation record contains a pointer to the
+ symbol to relocate to, the offset of the data to relocate, the
+ section the data is in, and a pointer to a relocation type
+ descriptor. Relocation is performed by passing messages through
+ the relocation type descriptor and the symbol pointer. Therefore,
+ relocations can be performed on output data using a relocation
+ method that is only available in one of the input formats. For
+ instance, Oasys provides a byte relocation format. A relocation
+ record requesting this relocation type would point indirectly to a
+ routine to perform this, so the relocation may be performed on a
+ byte being written to a 68k COFF file, even though 68k COFF has no
+ such relocation type.
+
+*line numbers*
+ Object formats can contain, for debugging purposes, some form of
+ mapping between symbols, source line numbers, and addresses in the
+ output file. These addresses have to be relocated along with the
+ symbol information. Each symbol with an associated list of line
+ number records points to the first record of the list. The head
+ of a line number list consists of a pointer to the symbol, which
+ allows finding out the address of the function whose line number
+ is being described. The rest of the list is made up of pairs:
+ offsets into the section and line numbers. Any format which can
+ simply derive this information can pass it successfully between
+ formats (COFF, IEEE and Oasys).
+
+
+File: ld.info, Node: MRI, Next: Index, Prev: BFD, Up: Top
+
+MRI Compatible Script Files
+***************************
+
+ To aid users making the transition to GNU `ld' from the MRI linker,
+`ld' can use MRI compatible linker scripts as an alternative to the
+more general-purpose linker scripting language described in *Note
+Command Language: Commands. MRI compatible linker scripts have a much
+simpler command set than the scripting language otherwise used with
+`ld'. GNU `ld' supports the most commonly used MRI linker commands;
+these commands are described here.
+
+ In general, MRI scripts aren't of much use with the `a.out' object
+file format, since it only has three sections and MRI scripts lack some
+features to make use of them.
+
+ You can specify a file containing an MRI-compatible script using the
+`-c' command-line option.
+
+ Each command in an MRI-compatible script occupies its own line; each
+command line starts with the keyword that identifies the command (though
+blank lines are also allowed for punctuation). If a line of an
+MRI-compatible script begins with an unrecognized keyword, `ld' issues
+a warning message, but continues processing the script.
+
+ Lines beginning with `*' are comments.
+
+ You can write these commands using all upper-case letters, or all
+lower case; for example, `chip' is the same as `CHIP'. The following
+list shows only the upper-case form of each command.
+
+`ABSOLUTE SECNAME'
+`ABSOLUTE SECNAME, SECNAME, ... SECNAME'
+ Normally, `ld' includes in the output file all sections from all
+ the input files. However, in an MRI-compatible script, you can
+ use the `ABSOLUTE' command to restrict the sections that will be
+ present in your output program. If the `ABSOLUTE' command is used
+ at all in a script, then only the sections named explicitly in
+ `ABSOLUTE' commands will appear in the linker output. You can
+ still use other input sections (whatever you select on the command
+ line, or using `LOAD') to resolve addresses in the output file.
+
+`ALIAS OUT-SECNAME, IN-SECNAME'
+ Use this command to place the data from input section IN-SECNAME
+ in a section called OUT-SECNAME in the linker output file.
+
+ IN-SECNAME may be an integer.
+
+`BASE EXPRESSION'
+ Use the value of EXPRESSION as the lowest address (other than
+ absolute addresses) in the output file.
+
+`CHIP EXPRESSION'
+`CHIP EXPRESSION, EXPRESSION'
+ This command does nothing; it is accepted only for compatibility.
+
+`END'
+ This command does nothing whatever; it's only accepted for
+ compatibility.
+
+`FORMAT OUTPUT-FORMAT'
+ Similar to the `OUTPUT_FORMAT' command in the more general linker
+ language, but restricted to one of these output formats:
+ 1. S-records, if OUTPUT-FORMAT is `S'
+
+ 2. IEEE, if OUTPUT-FORMAT is `IEEE'
+
+ 3. COFF (the `coff-m68k' variant in BFD), if OUTPUT-FORMAT is
+ `COFF'
+
+`LIST ANYTHING...'
+ Print (to the standard output file) a link map, as produced by the
+ `ld' command-line option `-M'.
+
+ The keyword `LIST' may be followed by anything on the same line,
+ with no change in its effect.
+
+`LOAD FILENAME'
+`LOAD FILENAME, FILENAME, ... FILENAME'
+ Include one or more object file FILENAME in the link; this has the
+ same effect as specifying FILENAME directly on the `ld' command
+ line.
+
+`NAME OUTPUT-NAME'
+ OUTPUT-NAME is the name for the program produced by `ld'; the
+ MRI-compatible command `NAME' is equivalent to the command-line
+ option `-o' or the general script language command `OUTPUT'.
+
+`ORDER SECNAME, SECNAME, ... SECNAME'
+`ORDER SECNAME SECNAME SECNAME'
+ Normally, `ld' orders the sections in its output file in the order
+ in which they first appear in the input files. In an
+ MRI-compatible script, you can override this ordering with the
+ `ORDER' command. The sections you list with `ORDER' will appear
+ first in your output file, in the order specified.
+
+`PUBLIC NAME=EXPRESSION'
+`PUBLIC NAME,EXPRESSION'
+`PUBLIC NAME EXPRESSION'
+ Supply a value (EXPRESSION) for external symbol NAME used in the
+ linker input files.
+
+`SECT SECNAME, EXPRESSION'
+`SECT SECNAME=EXPRESSION'
+`SECT SECNAME EXPRESSION'
+ You can use any of these three forms of the `SECT' command to
+ specify the start address (EXPRESSION) for section SECNAME. If
+ you have more than one `SECT' statement for the same SECNAME, only
+ the *first* sets the start address.
+
+
+File: ld.info, Node: Index, Prev: MRI, Up: Top
+
+Index
+*****
+
+* Menu:
+
+* ": Symbols.
+* *( COMMON ): Section Placement.
+* *(SECTION): Section Placement.
+* -help: Options.
+* -version: Options.
+* -AARCH: Options.
+* -b FORMAT: Options.
+* -Bstatic: Options.
+* -c MRI-CMDFILE: Options.
+* -d: Options.
+* -dc: Options.
+* -defsym SYMBOL=EXP: Options.
+* -dp: Options.
+* -e ENTRY: Options.
+* -F: Options.
+* -format: Options.
+* -g: Options.
+* -G: Options.
+* -i: Options.
+* -lARCHIVE: Options.
+* -LDIR: Options.
+* -M: Options.
+* -m EMULATION: Options.
+* -Map: Options.
+* -N: Options.
+* -n: Options.
+* -noinhibit-exec: Options.
+* -o OUTPUT: Options.
+* -oformat: Options.
+* -r: Options.
+* -R FILE: Options.
+* -relax: Options.
+* -s: Options.
+* -S: Options.
+* -t: Options.
+* -T SCRIPT: Options.
+* -Tbss ORG: Options.
+* -Tdata ORG: Options.
+* -Ttext ORG: Options.
+* -u SYMBOL: Options.
+* -Ur: Options.
+* -v: Options.
+* -V: Options.
+* -warn-comon: Options.
+* -x: Options.
+* -X: Options.
+* -ySYMBOL: Options.
+* .: Location Counter.
+* 0x: Integers.
+* ;: Assignment.
+* =FILL: Section Options.
+* >REGION: Section Options.
+* ABSOLUTE (MRI): MRI.
+* ALIAS (MRI): MRI.
+* BASE (MRI): MRI.
+* CHIP (MRI): MRI.
+* END (MRI): MRI.
+* FORMAT (MRI): MRI.
+* LIST (MRI): MRI.
+* LOAD (MRI): MRI.
+* NAME (MRI): MRI.
+* ORDER (MRI): MRI.
+* PUBLIC (MRI): MRI.
+* SECT (MRI): MRI.
+* FILENAME: Section Placement.
+* FILENAME(SECTION): Section Placement.
+* SYMBOL = EXPRESSION ;: Section Data Expressions.
+* SYMBOL F= EXPRESSION ;: Section Data Expressions.
+* absolute and relocatable symbols: Assignment.
+* ABSOLUTE(EXP): Arithmetic Functions.
+* ADDR(SECTION): Arithmetic Functions.
+* ALIGN(EXP): Arithmetic Functions.
+* aligning sections: Section Options.
+* allocating memory: MEMORY.
+* architectures: Options.
+* architectures available: BFD.
+* archive files, from cmd line: Options.
+* arithmetic: Expressions.
+* arithmetic operators: Operators.
+* assignment in scripts: Assignment.
+* assignment, in section defn: Section Data Expressions.
+* back end: BFD.
+* BFD canonical format: Canonical format.
+* BFD requirements: BFD.
+* binary input files: Option Commands.
+* binary input format: Options.
+* BLOCK(ALIGN): Section Options.
+* BYTE(EXPRESSION): Section Data Expressions.
+* combining symbols, warnings on: Options.
+* command files: Commands.
+* command line: Options.
+* commands, fundamental: Scripts.
+* comments: Scripts.
+* common allocation: Option Commands.
+* common allocation: Options.
+* commons in output: Section Placement.
+* compatibility, MRI: Options.
+* constructors: Options.
+* contents of a section: Section Placement.
+* CREATE_OBJECT_SYMBOLS: Section Data Expressions.
+* current output location: Location Counter.
+* decimal integers: Integers.
+* default input format: Environment.
+* DEFINED(SYMBOL): Arithmetic Functions.
+* deleting local symbols: Options.
+* direct output: Section Data Expressions.
+* discontinuous memory: MEMORY.
+* dot: Location Counter.
+* emulation: Options.
+* entry point, defaults: Entry Point.
+* entry point, from command line: Options.
+* ENTRY(SYMBOL): Entry Point.
+* expression evaluation order: Evaluation.
+* expression syntax: Expressions.
+* expression, absolute: Arithmetic Functions.
+* expressions in a section: Section Data Expressions.
+* filename symbols: Section Data Expressions.
+* files and sections, section defn: Section Placement.
+* files, including in output sections: Section Placement.
+* fill pattern, entire section: Section Options.
+* FILL(EXPRESSION): Section Data Expressions.
+* first input file: Option Commands.
+* first instruction: Entry Point.
+* FLOAT: Option Commands.
+* FORCE_COMMON_ALLOCATION: Option Commands.
+* format, output file: Option Commands.
+* formats available: BFD.
+* functions in expression language: Arithmetic Functions.
+* fundamental script commands: Scripts.
+* GNU linker: Overview.
+* GNUTARGET: Option Commands.
+* GNUTARGET: Environment.
+* H8/300 support: H8/300.
+* header size: Arithmetic Functions.
+* help: Options.
+* hexadecimal integers: Integers.
+* holes: Location Counter.
+* holes, filling: Section Data Expressions.
+* i960 support: i960.
+* incremental link: Options.
+* INPUT ( FILES ): Option Commands.
+* input file format: Option Commands.
+* input filename symbols: Section Data Expressions.
+* input files, displaying: Options.
+* input files, section defn: Section Placement.
+* input format: Options.
+* input format: Options.
+* input sections to output section: Section Placement.
+* integer notation: Integers.
+* integer suffixes: Integers.
+* internal object-file format: Canonical format.
+* K and M integer suffixes: Integers.
+* l =: MEMORY.
+* L, deleting symbols beginning: Options.
+* layout of output file: Scripts.
+* lazy evaluation: Evaluation.
+* len =: MEMORY.
+* LENGTH =: MEMORY.
+* link map: Options.
+* link map: Options.
+* local symbols, deleting: Options.
+* location counter: Location Counter.
+* LONG(EXPRESSION): Section Data Expressions.
+* M and K integer suffixes: Integers.
+* machine architecture, output: Option Commands.
+* machine dependencies: Machine Dependent.
+* MEMORY: MEMORY.
+* memory region attributes: MEMORY.
+* memory regions and sections: Section Options.
+* MRI compatibility: MRI.
+* names: Symbols.
+* naming memory regions: MEMORY.
+* naming output sections: Section Definition.
+* naming the output file: Options.
+* naming the output file: Option Commands.
+* negative integers: Integers.
+* NEXT(EXP): Arithmetic Functions.
+* NMAGIC: Options.
+* NOFLOAT: Option Commands.
+* NOLOAD: Section Options.
+* Non constant expression: Assignment.
+* o =: MEMORY.
+* object file management: BFD.
+* object files: Options.
+* object size: Options.
+* octal integers: Integers.
+* OMAGIC: Options.
+* opening object files: BFD outline.
+* Operators for arithmetic: Operators.
+* options: Options.
+* org =: MEMORY.
+* ORIGIN =: MEMORY.
+* OUTPUT ( FILENAME ): Option Commands.
+* output file after errors: Options.
+* output file layout: Scripts.
+* OUTPUT_ARCH ( BFDNAME ): Option Commands.
+* OUTPUT_FORMAT ( BFDNAME ): Option Commands.
+* partial link: Options.
+* path for libraries: Option Commands.
+* precedence in expressions: Operators.
+* prevent unnecessary loading: Section Options.
+* quoted symbol names: Symbols.
+* read-only text: Options.
+* read/write from cmd line: Options.
+* regions of memory: MEMORY.
+* relaxing addressing modes: Options.
+* relaxing on H8/300: H8/300.
+* relocatable and absolute symbols: Assignment.
+* relocatable output: Options.
+* requirements for BFD: BFD.
+* rounding up location counter: Arithmetic Functions.
+* scaled integers: Integers.
+* script files: Options.
+* search directory, from cmd line: Options.
+* search path, libraries: Option Commands.
+* SEARCH_DIR ( PATH ): Option Commands.
+* section address: Arithmetic Functions.
+* section address: Section Options.
+* section alignment: Section Options.
+* section definition: Section Definition.
+* section defn, full syntax: Section Options.
+* section fill pattern: Section Options.
+* section size: Arithmetic Functions.
+* section start: Section Options.
+* section, assigning to memory region: Section Options.
+* SECTIONS: SECTIONS.
+* segment origins, cmd line: Options.
+* semicolon: Assignment.
+* SHORT(EXPRESSION): Section Data Expressions.
+* SIZEOF(SECTION): Arithmetic Functions.
+* SIZEOF_HEADERS: Arithmetic Functions.
+* sizeof_headers: Arithmetic Functions.
+* standard Unix system: Options.
+* start address, section: Section Options.
+* start of execution: Entry Point.
+* STARTUP ( FILENAME ): Option Commands.
+* strip all symbols: Options.
+* strip debugger symbols: Options.
+* suffixes for integers: Integers.
+* symbol defaults: Arithmetic Functions.
+* symbol definition, scripts: Assignment.
+* symbol names: Symbols.
+* symbol tracing: Options.
+* symbol-only input: Options.
+* symbols, from command line: Options.
+* symbols, relocatable and absolute: Assignment.
+* synthesizing linker: Options.
+* synthesizing on H8/300: H8/300.
+* TARGET ( FORMAT ): Option Commands.
+* unallocated address, next: Arithmetic Functions.
+* undefined symbol: Options.
+* uninitialized data: Section Placement.
+* unspecified memory: Section Data Expressions.
+* usage: Options.
+* variables, defining: Assignment.
+* verbose: Options.
+* version: Options.
+* version: Options.
+* warnings, on combining symbols: Options.
+* what is this?: Overview.
+
+