560 lines
20 KiB
ReStructuredText
560 lines
20 KiB
ReStructuredText
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llvm-objcopy - object copying and editing tool
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==============================================
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.. program:: llvm-objcopy
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SYNOPSIS
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--------
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:program:`llvm-objcopy` [*options*] *input* [*output*]
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DESCRIPTION
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-----------
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:program:`llvm-objcopy` is a tool to copy and manipulate objects. In basic
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usage, it makes a semantic copy of the input to the output. If any options are
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specified, the output may be modified along the way, e.g. by removing sections.
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If no output file is specified, the input file is modified in-place. If "-" is
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specified for the input file, the input is read from the program's standard
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input stream. If "-" is specified for the output file, the output is written to
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the standard output stream of the program.
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If the input is an archive, any requested operations will be applied to each
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archive member individually.
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The tool is still in active development, but in most scenarios it works as a
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drop-in replacement for GNU's :program:`objcopy`.
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GENERIC AND CROSS-PLATFORM OPTIONS
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----------------------------------
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The following options are either agnostic of the file format, or apply to
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multiple file formats.
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.. option:: --add-gnu-debuglink <debug-file>
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Add a .gnu_debuglink section for ``<debug-file>`` to the output.
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.. option:: --add-section <section=file>
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Add a section named ``<section>`` with the contents of ``<file>`` to the
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output. For ELF objects the section will be of type `SHT_NOTE`, if the name
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starts with ".note". Otherwise, it will have type `SHT_PROGBITS`. Can be
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specified multiple times to add multiple sections.
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For MachO objects, ``<section>`` must be formatted as
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``<segment name>,<section name>``.
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.. option:: --binary-architecture <arch>, -B
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Ignored for compatibility.
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.. option:: --disable-deterministic-archives, -U
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Use real values for UIDs, GIDs and timestamps when updating archive member
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headers.
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.. option:: --discard-all, -x
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Remove most local symbols from the output. Different file formats may limit
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this to a subset of the local symbols. For example, file and section symbols in
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ELF objects will not be discarded.
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.. option:: --dump-section <section>=<file>
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Dump the contents of section ``<section>`` into the file ``<file>``. Can be
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specified multiple times to dump multiple sections to different files.
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``<file>`` is unrelated to the input and output files provided to
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:program:`llvm-objcopy` and as such the normal copying and editing
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operations will still be performed. No operations are performed on the sections
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prior to dumping them.
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For MachO objects, ``<section>`` must be formatted as
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``<segment name>,<section name>``.
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.. option:: --enable-deterministic-archives, -D
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Enable deterministic mode when copying archives, i.e. use 0 for archive member
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header UIDs, GIDs and timestamp fields. On by default.
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.. option:: --help, -h
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Print a summary of command line options.
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.. option:: --only-keep-debug
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Produce a debug file as the output that only preserves contents of sections
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useful for debugging purposes.
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For ELF objects, this removes the contents of `SHF_ALLOC` sections that are not
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`SHT_NOTE` by making them `SHT_NOBITS` and shrinking the program headers where
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possible.
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.. option:: --only-section <section>, -j
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Remove all sections from the output, except for sections named ``<section>``.
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Can be specified multiple times to keep multiple sections.
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For MachO objects, ``<section>`` must be formatted as
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``<segment name>,<section name>``.
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.. option:: --redefine-sym <old>=<new>
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Rename symbols called ``<old>`` to ``<new>`` in the output. Can be specified
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multiple times to rename multiple symbols.
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.. option:: --redefine-syms <filename>
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Rename symbols in the output as described in the file ``<filename>``. In the
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file, each line represents a single symbol to rename, with the old name and new
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name separated by whitespace. Leading and trailing whitespace is ignored, as is
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anything following a '#'. Can be specified multiple times to read names from
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multiple files.
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.. option:: --regex
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If specified, symbol and section names specified by other switches are treated
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as extended POSIX regular expression patterns.
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.. option:: --remove-section <section>, -R
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Remove the specified section from the output. Can be specified multiple times
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to remove multiple sections simultaneously.
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For MachO objects, ``<section>`` must be formatted as
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``<segment name>,<section name>``.
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.. option:: --set-section-alignment <section>=<align>
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Set the alignment of section ``<section>`` to `<align>``. Can be specified
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multiple times to update multiple sections.
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.. option:: --set-section-flags <section>=<flag>[,<flag>,...]
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Set section properties in the output of section ``<section>`` based on the
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specified ``<flag>`` values. Can be specified multiple times to update multiple
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sections.
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Supported flag names are `alloc`, `load`, `noload`, `readonly`, `exclude`,
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`debug`, `code`, `data`, `rom`, `share`, `contents`, `merge` and `strings`. Not
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all flags are meaningful for all object file formats.
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For ELF objects, the flags have the following effects:
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- `alloc` = add the `SHF_ALLOC` flag.
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- `load` = if the section has `SHT_NOBITS` type, mark it as a `SHT_PROGBITS`
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section.
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- `readonly` = if this flag is not specified, add the `SHF_WRITE` flag.
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- `exclude` = add the `SHF_EXCLUDE` flag.
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- `code` = add the `SHF_EXECINSTR` flag.
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- `merge` = add the `SHF_MERGE` flag.
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- `strings` = add the `SHF_STRINGS` flag.
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- `contents` = if the section has `SHT_NOBITS` type, mark it as a `SHT_PROGBITS`
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section.
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For COFF objects, the flags have the following effects:
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- `alloc` = add the `IMAGE_SCN_CNT_UNINITIALIZED_DATA` and `IMAGE_SCN_MEM_READ`
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flags, unless the `load` flag is specified.
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- `noload` = add the `IMAGE_SCN_LNK_REMOVE` and `IMAGE_SCN_MEM_READ` flags.
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- `readonly` = if this flag is not specified, add the `IMAGE_SCN_MEM_WRITE`
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flag.
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- `exclude` = add the `IMAGE_SCN_LNK_REMOVE` and `IMAGE_SCN_MEM_READ` flags.
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- `debug` = add the `IMAGE_SCN_CNT_INITIALIZED_DATA`,
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`IMAGE_SCN_MEM_DISCARDABLE` and `IMAGE_SCN_MEM_READ` flags.
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- `code` = add the `IMAGE_SCN_CNT_CODE`, `IMAGE_SCN_MEM_EXECUTE` and
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`IMAGE_SCN_MEM_READ` flags.
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- `data` = add the `IMAGE_SCN_CNT_INITIALIZED_DATA` and `IMAGE_SCN_MEM_READ`
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flags.
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- `share` = add the `IMAGE_SCN_MEM_SHARED` and `IMAGE_SCN_MEM_READ` flags.
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.. option:: --strip-all-gnu
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Remove all symbols, debug sections and relocations from the output. This option
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is equivalent to GNU :program:`objcopy`'s ``--strip-all`` switch.
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.. option:: --strip-all, -S
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For ELF objects, remove from the output all symbols and non-alloc sections not
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within segments, except for .gnu.warning, .ARM.attribute sections and the
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section name table.
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For COFF and Mach-O objects, remove all symbols, debug sections, and
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relocations from the output.
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.. option:: --strip-debug, -g
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Remove all debug sections from the output.
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.. option:: --strip-symbol <symbol>, -N
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Remove all symbols named ``<symbol>`` from the output. Can be specified
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multiple times to remove multiple symbols.
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.. option:: --strip-symbols <filename>
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Remove all symbols whose names appear in the file ``<filename>``, from the
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output. In the file, each line represents a single symbol name, with leading
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and trailing whitespace ignored, as is anything following a '#'. Can be
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specified multiple times to read names from multiple files.
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.. option:: --strip-unneeded-symbol <symbol>
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Remove from the output all symbols named ``<symbol>`` that are local or
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undefined and are not required by any relocation.
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.. option:: --strip-unneeded-symbols <filename>
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Remove all symbols whose names appear in the file ``<filename>``, from the
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output, if they are local or undefined and are not required by any relocation.
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In the file, each line represents a single symbol name, with leading and
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trailing whitespace ignored, as is anything following a '#'. Can be specified
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multiple times to read names from multiple files.
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.. option:: --strip-unneeded
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Remove from the output all local or undefined symbols that are not required by
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relocations. Also remove all debug sections.
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.. option:: --version, -V
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Display the version of the :program:`llvm-objcopy` executable.
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.. option:: --wildcard, -w
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Allow wildcard syntax for symbol-related flags. On by default for
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section-related flags. Incompatible with --regex.
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Wildcard syntax allows the following special symbols:
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====================== ========================= ==================
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Character Meaning Equivalent
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====================== ========================= ==================
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``*`` Any number of characters ``.*``
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``?`` Any single character ``.``
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``\`` Escape the next character ``\``
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``[a-z]`` Character class ``[a-z]``
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``[!a-z]``, ``[^a-z]`` Negated character class ``[^a-z]``
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====================== ========================= ==================
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Additionally, starting a wildcard with '!' will prevent a match, even if
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another flag matches. For example ``-w -N '*' -N '!x'`` will strip all symbols
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except for ``x``.
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The order of wildcards does not matter. For example, ``-w -N '*' -N '!x'`` is
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the same as ``-w -N '!x' -N '*'``.
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.. option:: @<FILE>
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Read command-line options and commands from response file `<FILE>`.
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ELF-SPECIFIC OPTIONS
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--------------------
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The following options are implemented only for ELF objects. If used with other
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objects, :program:`llvm-objcopy` will either emit an error or silently ignore
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them.
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.. option:: --add-symbol <name>=[<section>:]<value>[,<flags>]
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Add a new symbol called ``<name>`` to the output symbol table, in the section
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named ``<section>``, with value ``<value>``. If ``<section>`` is not specified,
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the symbol is added as an absolute symbol. The ``<flags>`` affect the symbol
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properties. Accepted values are:
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- `global` = the symbol will have global binding.
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- `local` = the symbol will have local binding.
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- `weak` = the symbol will have weak binding.
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- `default` = the symbol will have default visibility.
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- `hidden` = the symbol will have hidden visibility.
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- `protected` = the symbol will have protected visibility.
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- `file` = the symbol will be an `STT_FILE` symbol.
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- `section` = the symbol will be an `STT_SECTION` symbol.
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- `object` = the symbol will be an `STT_OBJECT` symbol.
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- `function` = the symbol will be an `STT_FUNC` symbol.
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- `indirect-function` = the symbol will be an `STT_GNU_IFUNC` symbol.
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Additionally, the following flags are accepted but ignored: `debug`,
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`constructor`, `warning`, `indirect`, `synthetic`, `unique-object`, `before`.
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Can be specified multiple times to add multiple symbols.
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.. option:: --allow-broken-links
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Allow :program:`llvm-objcopy` to remove sections even if it would leave invalid
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section references. Any invalid sh_link fields will be set to zero.
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.. option:: --build-id-link-dir <dir>
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Set the directory used by :option:`--build-id-link-input` and
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:option:`--build-id-link-output`.
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.. option:: --build-id-link-input <suffix>
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Hard-link the input to ``<dir>/xx/xxx<suffix>``, where ``<dir>`` is the directory
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specified by :option:`--build-id-link-dir`. The path used is derived from the
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hex build ID.
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.. option:: --build-id-link-output <suffix>
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Hard-link the output to ``<dir>/xx/xxx<suffix>``, where ``<dir>`` is the directory
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specified by :option:`--build-id-link-dir`. The path used is derived from the
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hex build ID.
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.. option:: --change-start <incr>, --adjust-start
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Add ``<incr>`` to the program's start address. Can be specified multiple
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times, in which case the values will be applied cumulatively.
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.. option:: --compress-debug-sections [<style>]
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Compress DWARF debug sections in the output, using the specified style.
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Supported styles are `zlib-gnu` and `zlib`. Defaults to `zlib` if no style is
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specified.
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.. option:: --decompress-debug-sections
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Decompress any compressed DWARF debug sections in the output.
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.. option:: --discard-locals, -X
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Remove local symbols starting with ".L" from the output.
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.. option:: --extract-dwo
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Remove all sections that are not DWARF .dwo sections from the output.
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.. option:: --extract-main-partition
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Extract the main partition from the output.
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.. option:: --extract-partition <name>
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Extract the named partition from the output.
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.. option:: --globalize-symbol <symbol>
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Mark any defined symbols named ``<symbol>`` as global symbols in the output.
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Can be specified multiple times to mark multiple symbols.
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.. option:: --globalize-symbols <filename>
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Read a list of names from the file ``<filename>`` and mark defined symbols with
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those names as global in the output. In the file, each line represents a single
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symbol, with leading and trailing whitespace ignored, as is anything following
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a '#'. Can be specified multiple times to read names from multiple files.
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.. option:: --input-target <format>, -I
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Read the input as the specified format. See `SUPPORTED FORMATS`_ for a list of
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valid ``<format>`` values. If unspecified, :program:`llvm-objcopy` will attempt
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to determine the format automatically.
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.. option:: --keep-file-symbols
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Keep symbols of type `STT_FILE`, even if they would otherwise be stripped.
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.. option:: --keep-global-symbol <symbol>
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Make all symbols local in the output, except for symbols with the name
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``<symbol>``. Can be specified multiple times to ignore multiple symbols.
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||
|
|
.. option:: --keep-global-symbols <filename>
|
||
|
|
|
||
|
|
Make all symbols local in the output, except for symbols named in the file
|
||
|
|
``<filename>``. In the file, each line represents a single symbol, with leading
|
||
|
|
and trailing whitespace ignored, as is anything following a '#'. Can be
|
||
|
|
specified multiple times to read names from multiple files.
|
||
|
|
|
||
|
|
.. option:: --keep-section <section>
|
||
|
|
|
||
|
|
When removing sections from the output, do not remove sections named
|
||
|
|
``<section>``. Can be specified multiple times to keep multiple sections.
|
||
|
|
|
||
|
|
.. option:: --keep-symbol <symbol>, -K
|
||
|
|
|
||
|
|
When removing symbols from the output, do not remove symbols named
|
||
|
|
``<symbol>``. Can be specified multiple times to keep multiple symbols.
|
||
|
|
|
||
|
|
.. option:: --keep-symbols <filename>
|
||
|
|
|
||
|
|
When removing symbols from the output do not remove symbols named in the file
|
||
|
|
``<filename>``. In the file, each line represents a single symbol, with leading
|
||
|
|
and trailing whitespace ignored, as is anything following a '#'. Can be
|
||
|
|
specified multiple times to read names from multiple files.
|
||
|
|
|
||
|
|
.. option:: --localize-hidden
|
||
|
|
|
||
|
|
Make all symbols with hidden or internal visibility local in the output.
|
||
|
|
|
||
|
|
.. option:: --localize-symbol <symbol>, -L
|
||
|
|
|
||
|
|
Mark any defined non-common symbol named ``<symbol>`` as a local symbol in the
|
||
|
|
output. Can be specified multiple times to mark multiple symbols as local.
|
||
|
|
|
||
|
|
.. option:: --localize-symbols <filename>
|
||
|
|
|
||
|
|
Read a list of names from the file ``<filename>`` and mark defined non-common
|
||
|
|
symbols with those names as local in the output. In the file, each line
|
||
|
|
represents a single symbol, with leading and trailing whitespace ignored, as is
|
||
|
|
anything following a '#'. Can be specified multiple times to read names from
|
||
|
|
multiple files.
|
||
|
|
|
||
|
|
.. option:: --new-symbol-visibility <visibility>
|
||
|
|
|
||
|
|
Specify the visibility of the symbols automatically created when using binary
|
||
|
|
input or :option:`--add-symbol`. Valid options are:
|
||
|
|
|
||
|
|
- `default`
|
||
|
|
- `hidden`
|
||
|
|
- `internal`
|
||
|
|
- `protected`
|
||
|
|
|
||
|
|
The default is `default`.
|
||
|
|
|
||
|
|
.. option:: --output-target <format>, -O
|
||
|
|
|
||
|
|
Write the output as the specified format. See `SUPPORTED FORMATS`_ for a list
|
||
|
|
of valid ``<format>`` values. If unspecified, the output format is assumed to
|
||
|
|
be the same as the value specified for :option:`--input-target` or the input
|
||
|
|
file's format if that option is also unspecified.
|
||
|
|
|
||
|
|
.. option:: --prefix-alloc-sections <prefix>
|
||
|
|
|
||
|
|
Add ``<prefix>`` to the front of the names of all allocatable sections in the
|
||
|
|
output.
|
||
|
|
|
||
|
|
.. option:: --prefix-symbols <prefix>
|
||
|
|
|
||
|
|
Add ``<prefix>`` to the front of every symbol name in the output.
|
||
|
|
|
||
|
|
.. option:: --preserve-dates, -p
|
||
|
|
|
||
|
|
Preserve access and modification timestamps in the output.
|
||
|
|
|
||
|
|
.. option:: --rename-section <old>=<new>[,<flag>,...]
|
||
|
|
|
||
|
|
Rename sections called ``<old>`` to ``<new>`` in the output, and apply any
|
||
|
|
specified ``<flag>`` values. See :option:`--set-section-flags` for a list of
|
||
|
|
supported flags. Can be specified multiple times to rename multiple sections.
|
||
|
|
|
||
|
|
.. option:: --set-start-addr <addr>
|
||
|
|
|
||
|
|
Set the start address of the output to ``<addr>``. Overrides any previously
|
||
|
|
specified :option:`--change-start` or :option:`--adjust-start` options.
|
||
|
|
|
||
|
|
.. option:: --split-dwo <dwo-file>
|
||
|
|
|
||
|
|
Equivalent to running :program:`llvm-objcopy` with :option:`--extract-dwo` and
|
||
|
|
``<dwo-file>`` as the output file and no other options, and then with
|
||
|
|
:option:`--strip-dwo` on the input file.
|
||
|
|
|
||
|
|
.. option:: --strip-dwo
|
||
|
|
|
||
|
|
Remove all DWARF .dwo sections from the output.
|
||
|
|
|
||
|
|
.. option:: --strip-non-alloc
|
||
|
|
|
||
|
|
Remove from the output all non-allocatable sections that are not within
|
||
|
|
segments.
|
||
|
|
|
||
|
|
.. option:: --strip-sections
|
||
|
|
|
||
|
|
Remove from the output all section headers and all section data not within
|
||
|
|
segments. Note that many tools will not be able to use an object without
|
||
|
|
section headers.
|
||
|
|
|
||
|
|
.. option:: --target <format>, -F
|
||
|
|
|
||
|
|
Equivalent to :option:`--input-target` and :option:`--output-target` for the
|
||
|
|
specified format. See `SUPPORTED FORMATS`_ for a list of valid ``<format>``
|
||
|
|
values.
|
||
|
|
|
||
|
|
.. option:: --weaken-symbol <symbol>, -W
|
||
|
|
|
||
|
|
Mark any global symbol named ``<symbol>`` as a weak symbol in the output. Can
|
||
|
|
be specified multiple times to mark multiple symbols as weak.
|
||
|
|
|
||
|
|
.. option:: --weaken-symbols <filename>
|
||
|
|
|
||
|
|
Read a list of names from the file ``<filename>`` and mark global symbols with
|
||
|
|
those names as weak in the output. In the file, each line represents a single
|
||
|
|
symbol, with leading and trailing whitespace ignored, as is anything following
|
||
|
|
a '#'. Can be specified multiple times to read names from multiple files.
|
||
|
|
|
||
|
|
.. option:: --weaken
|
||
|
|
|
||
|
|
Mark all defined global symbols as weak in the output.
|
||
|
|
|
||
|
|
SUPPORTED FORMATS
|
||
|
|
-----------------
|
||
|
|
|
||
|
|
The following values are currently supported by :program:`llvm-objcopy` for the
|
||
|
|
:option:`--input-target`, :option:`--output-target`, and :option:`--target`
|
||
|
|
options. For GNU :program:`objcopy` compatibility, the values are all bfdnames.
|
||
|
|
|
||
|
|
- `binary`
|
||
|
|
- `ihex`
|
||
|
|
- `elf32-i386`
|
||
|
|
- `elf32-x86-64`
|
||
|
|
- `elf64-x86-64`
|
||
|
|
- `elf32-iamcu`
|
||
|
|
- `elf32-littlearm`
|
||
|
|
- `elf64-aarch64`
|
||
|
|
- `elf64-littleaarch64`
|
||
|
|
- `elf32-littleriscv`
|
||
|
|
- `elf64-littleriscv`
|
||
|
|
- `elf32-powerpc`
|
||
|
|
- `elf32-powerpcle`
|
||
|
|
- `elf64-powerpc`
|
||
|
|
- `elf64-powerpcle`
|
||
|
|
- `elf32-bigmips`
|
||
|
|
- `elf32-ntradbigmips`
|
||
|
|
- `elf32-ntradlittlemips`
|
||
|
|
- `elf32-tradbigmips`
|
||
|
|
- `elf32-tradlittlemips`
|
||
|
|
- `elf64-tradbigmips`
|
||
|
|
- `elf64-tradlittlemips`
|
||
|
|
- `elf32-sparc`
|
||
|
|
- `elf32-sparcel`
|
||
|
|
|
||
|
|
Additionally, all targets except `binary` and `ihex` can have `-freebsd` as a
|
||
|
|
suffix.
|
||
|
|
|
||
|
|
BINARY INPUT AND OUTPUT
|
||
|
|
-----------------------
|
||
|
|
|
||
|
|
If `binary` is used as the value for :option:`--input-target`, the input file
|
||
|
|
will be embedded as a data section in an ELF relocatable object, with symbols
|
||
|
|
``_binary_<file_name>_start``, ``_binary_<file_name>_end``, and
|
||
|
|
``_binary_<file_name>_size`` representing the start, end and size of the data,
|
||
|
|
where ``<file_name>`` is the path of the input file as specified on the command
|
||
|
|
line with non-alphanumeric characters converted to ``_``.
|
||
|
|
|
||
|
|
If `binary` is used as the value for :option:`--output-target`, the output file
|
||
|
|
will be a raw binary file, containing the memory image of the input file.
|
||
|
|
Symbols and relocation information will be discarded. The image will start at
|
||
|
|
the address of the first loadable section in the output.
|
||
|
|
|
||
|
|
EXIT STATUS
|
||
|
|
-----------
|
||
|
|
|
||
|
|
:program:`llvm-objcopy` exits with a non-zero exit code if there is an error.
|
||
|
|
Otherwise, it exits with code 0.
|
||
|
|
|
||
|
|
BUGS
|
||
|
|
----
|
||
|
|
|
||
|
|
To report bugs, please visit <https://bugs.llvm.org/>.
|
||
|
|
|
||
|
|
There is a known issue with :option:`--input-target` and :option:`--target`
|
||
|
|
causing only ``binary`` and ``ihex`` formats to have any effect. Other values
|
||
|
|
will be ignored and :program:`llvm-objcopy` will attempt to guess the input
|
||
|
|
format.
|
||
|
|
|
||
|
|
SEE ALSO
|
||
|
|
--------
|
||
|
|
|
||
|
|
:manpage:`llvm-strip(1)`
|