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Date: Mon, 29 Dec 2008 11:14:46 -0500 (EST) From: "John David Anglin" <dave@...uly1.hia.nrc.ca> To: deller@....de (Helge Deller) Cc: linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org, kyle@...artin.ca, randolph@...sq.org, jmm@...til.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, deller@....de Subject: Re: [PATCH 2/2] parisc: fix module loading failure of large modules 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@...-cnrc.gc.ca National Research Council of Canada (613) 990-0752 (FAX: 952-6602) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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