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Re: [patch] Arm v4t Thumb shared libraries.
- From: Richard Earnshaw <rearnsha at arm dot com>
- To: Paul Brook <paul at codesourcery dot com>
- Cc: binutils at sourceware dot org
- Date: Fri, 18 Aug 2006 09:49:39 +0100
- Subject: Re: [patch] Arm v4t Thumb shared libraries.
- References: <firstname.lastname@example.org>
On Thu, 2006-08-17 at 22:36, Paul Brook wrote:
> The current arm-linux PLT sequence ends with the equivalent of
> ldr pc, [ip]
> This sequence is not interworking safe on armv4t hardware. To enable use of
> Thumb in shared libraries there are two options:
> a) Use a new PLT sequence. Because we only have one scratch register and the
> requirements of the lazy resolver this means doubling the size of all PLT,
> entries and probably breaks prelinking.
> b) Make sure that all functions exported from shared libraries are entered in
> Arm mode, inserting stubs as neccessary, thus avoiding the whole issue. This
> also means that prelinking and applications which do not use Thumb are
> The attached patch implements (b). It reuses the existing infrastructure for
> generating arm->thumb stubs.
Yes, this is fine, except that i would add a comment here:
+ if (globals->use_blx)
explaining why we can take that shortcut.