Messages in this thread | | | Subject | Re: [PATCH 2/2] parisc: fix module loading failure of large modules | Date | Mon, 29 Dec 2008 11:14:46 -0500 (EST) | From | "John David Anglin" <> |
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Hi Helge,
> With this patch we now instead append individual PLT stub entries > directly at the end of the code sections where the stubs are actually > called. This reduces the distance between the PCREL location and the > stub entry so that the relocations can be fulfilled.
GCC for PA-RISC assumes that the stubs will be placed before the code section. This is what HP-UX does. It's also not possible to compute the distance to the end of a function in GCC due to the way branch shortening is done. If the distance to the start of the code section is too large, GCC outputs a long call.
If you can insert them before the code section where the stubs are called, this will minimize the chance that a pc-relative call will not reach its stub.
It is possible to put the stubs after the code section if you can ensure the distance for each call isn't too large. I believe GNU ld does some consolidation of stub blocks.
Great patch!
Dave -- J. David Anglin dave.anglin@nrc-cnrc.gc.ca National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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