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Re: Bug in arm dynamic linker?

On Wed, 23 Aug 2000, Chris Gorman wrote:

> When I attempt to start apache, I get the following error with some of
> the DSO modules ..
> Cannot load /usr/lib/apache/1.3/libphp3.so into server:
> /usr/lib/apache/1.3/libphp3.so: R_ARM_PC24 relocation out of range
> I'm wondering if this is the bug Scott Bambrough refers to in his
> netwinder.org FAQ entry?  (See References:)   


> The bug Scott outlines occurs
> occasionaly when the dynamic liker attempts to fixup PC24 relocs in the .text
> segment of shared libraries which are not compiled -fPIC.
> Is there a way to look at the .text segment of the shared library for PC24
> relocs?  (via objdump -?)  If so what would one look like?  Does anyone have
> other suggestions for determining whether or not this is my bug? 

objdump --dynamic-reloc /usr/lib/libimlib-jpeg.so
objdump --reloc /usr/lib/libimlib-jpeg.a

If there is a problem you will see some PC24 relocs in the .text section,
as seen from this static library.
	In archive libimlib-jpeg.a:

	io-jpeg.o:     file format elf32-littlearm

	OFFSET   TYPE              VALUE 
	00000020 R_ARM_PC24        jpeg_std_error

If you are using an old binutils, upgrade (, or 2.10).  It makes
it easier to explain.

> Also if this is the bug Scott refers to, can this be rectified by
> adding a -fPIC to the build commands for apache and php3 to build
> position independent code which will bypass the introduction of PC24
> relocs into .text segments of the DSO's?  Or is too oversimplified?

Yes, rebuild with -fPIC for php3.

> And finaly, is anyone aware of a newer binutils which resolves the bug
> referenced in Scott's FAQ entry?

It will actually be addressed in glibc.  Scott's done a bit of work, but
it only works for small fixup currently.


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