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14 Chapter 4. objcopy

[--help] [--info]

infile [outfile]

The gnu objcopy utility copies the contents of an object ﬁle to another. objcopy uses the gnu bfd

Library to read and write the object ﬁles. It can write the destination object ﬁle in a format different

from that of the source object ﬁle. The exact behavior of objcopy is controlled by command-line

options. Note that objcopy should be able to copy a fully linked ﬁle between any two formats.

However, copying a relocatable object ﬁle between any two formats may not work as expected.

objcopy creates temporary ﬁles to do its translations and deletes them afterward. objcopy uses bfd

to do all its translation work; it has access to all the formats described in bfd and thus is able to

recognize most formats without being told explicitly. .

objcopy can be used to generate S-records by using an output target of srec (e.g., use -O srec).

objcopy can be used to generate a raw binary ﬁle by using an output target of binary (e.g., use -O

binary). When objcopy generates a raw binary ﬁle, it will essentially produce a memory dump of

the contents of the input object ﬁle. All symbols and relocation information will be discarded. The

memory dump will start at the load address of the lowest section copied into the output ﬁle.

When generating an S-record or a raw binary ﬁle, it may be helpful to use -S to remove sections

containing debugging information. In some cases -R will be useful to remove sections which contain

information that is not needed by the binary ﬁle.

Note--objcopy is not able to change the endianness of its input ﬁles. If the input format has an

endianness (some formats do not), objcopy can only copy the inputs into ﬁle formats that have the

same endianness or which have no endianness (e.g., srec).

infile

outfile

The input and output ﬁles, respectively. If you do not specify outfile, objcopy creates a

temporary ﬁle and destructively renames the result with the name of infile.

-I bfdname

-input-target=bfdname

Consider the source ﬁle’s object format to be bfdname, rather than attempting to deduce it.

Section 16.1 Target Selection, for more information.

-O bfdname

-output-target=bfdname

Write the output ﬁle using the object format bfdname. Section 16.1 Target Selection, for more

information.

-F bfdname

-target=bfdname

Use bfdname as the object format for both the input and the output ﬁle; i.e., simply transfer data

from source to destination with no translation. Section 16.1 Target Selection, for more informa-

tion.

-B bfdarch

-binary-architecture=bfdarch

Useful when transforming a raw binary input ﬁle into an object ﬁle. In this case the output

architecture can be set to bfdarch. This option will be ignored if the input ﬁle has a known

bfdarch. You can access this binary data inside a program by referencing the special symbols

that are created by the conversion process. These symbols are called _binary_objfile_start,

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