Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuel d'utilisateur télécharger pdf (Page 24)

18 Chapter 4. objcopy

-add-section sectionname=filename

Add a new section named sectionname while copying the ﬁle. The contents of the new section

are taken from the ﬁle filename. The size of the section will be the size of the ﬁle. This option

only works on ﬁle formats which can support sections with arbitrary names.

-rename-section oldname=newname[,flags]

Rename a section from oldname to newname, optionally changing the section’s ﬂags to flags

in the process. This has the advantage over usng a linker script to perform the rename in that the

output stays as an object ﬁle and does not become a linked executable.

This option is particularly helpful when the input format is binary, since this will always cre-

ate a section called .data. If for example, you wanted instead to create a section called .rodata

containing binary data you could use the following command line to achieve it:

objcopy -I binary -O

output_format -B architecture \

--rename-section .data=.rodata,alloc,load,readonly,data,contents \

input_binary_file output_object_file

-change-leading-char

Some object ﬁle formats use special characters at the start of symbols. The most common

such character is underscore, which compilers often add before every symbol. This option tells

objcopy to change the leading character of every symbol when it converts between object ﬁle

formats. If the object ﬁle formats use the same leading character, this option has no effect. Oth-

erwise, it will add a character, or remove a character, or change a character, as appropriate.

-remove-leading-char

If the ﬁrst character of a global symbol is a special symbol leading character used by the object

ﬁle format, remove the character. The most common symbol leading character is underscore.

This option will remove a leading underscore from all global symbols. This can be useful if

you want to link together objects of different ﬁle formats with different conventions for symbol

names. This is different from -change-leading-char because it always changes the symbol

name when appropriate, regardless of the object ﬁle format of the output ﬁle.

-srec-len=ival

Meaningful only for srec output. Set the maximum length of the Srecords being produced to

ival. This length covers both address, data and crc ﬁelds.

-srec-forceS3

Meaningful only for srec output. Avoid generation of S1/S2 records, creating S3-only record

format.

-redefine-sym old=new

Change the name of a symbol old, to new. This can be useful when one is trying link two things

together for which you have no source, and there are name collisions.

-redefine-syms=filename

Apply -redefine-sym to each symbol pair "old new" listed in the ﬁle filename. filename

is simply a ﬂat ﬁle, with one symbol pair per line. Line comments may be introduced by the hash

character. This option may be given more than once.

-weaken

Change all global symbols in the ﬁle to be weak. This can be useful when building an object

which will be linked against other objects using the -R option to the linker. This option is only

effective when using an object ﬁle format which supports weak symbols.

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Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuel d'utilisateur Page 24

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