[Bug 503185] Re: fails to build on armel/lucid

[Dave Martin]

ARMv7 generally does not allow the PC to be used as a destination
register for random operations.  The code will also not work in Thumb
because the "Thumb bit" in the return address (bottom bit of lr) is not
set properly.

The best way to fix this is to precompute the address of the kuser
helper code to call (in r3) and call it with BLX r3.  This only works on
v5 and above; this is reasonable because the code won't build for Thumb
on ARMv4T anyway for various other reasons.

The attached patch attempts to do this when appropriate.

I will try to test it, but haven't been able to do so yet.


** Attachment added: "Patch to call the kuser helper functions in a Thumb-2 compatible way"
   http://launchpadlibrarian.net/38032395/cr_atomic_arm.diff

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fails to build on armel/lucid
https://bugs.launchpad.net/bugs/503185
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