elf section type & objcopy
Thu Jan 28 17:34:00 GMT 2010
Back in 2006 H.J. applied this bfd patch:
2006-04-26 H.J. Lu <firstname.lastname@example.org>
* elf.c (_bfd_elf_new_section_hook): Don't set section ELF type
and flags if its BFD flags have been set.
(_bfd_elf_init_private_section_data): Don't copy the output ELF
section type from input if it has been set to something
The mailing list thread is http://sourceware.org/ml/binutils/2006-04/msg00302.html
this breaks the following behaviour of objcopy:
objcopy --add-section .note=some-file in.o out.o
previously, the new .note section would get a section type of NOTES, because
_bfd_elf_get_sec_type_attr got called and checks for special section names. The
above patch causes that not to happen, as objcopy used make_section_with_flags,
passing non-zero flags in. Yes, it's taken this long for someone to notice :)
The attached flag also sets SEC_LINKER_CREATED to force checking the section
name and restores the original behaviour.
I've not checked whether setting the section type from the name this way is
documented -- it should be if it is what we want to happen. I also need to
create a testcase for this patch.
I have verified that the attached patch causes no regressions -- HJ's test cases
still pass, so I guess I've not broken the above fix.
Am I heading in the right direction?
Nathan Sidwell :: http://www.codesourcery.com :: CodeSourcery
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