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Re: [Qemu-devel] qemu-arm: wrong execution of post-indexed loads when Rm
Re: [Qemu-devel] qemu-arm: wrong execution of post-indexed loads when Rm and Rd are the same register
Thu, 15 Mar 2007 21:10:39 +0000
> > This is still wrong.
> So, is this a known bug?
Still wrong implies it's a bug, and your patch does not fix it properly.
> > The writeback must happen after the load.
> We code like this because
> - we didn't find this restriction in arm reference manual
It's the Abort model section you mention below.
> - the LLVM uses this instruction expecting a result like this
The compiler knows nothing about the abort behavior. The difference is only
visible if the load faults.
> - That was the result that we got running these instructions in an OMAP1710
I suggest you check again. I'm fairly sure the arm926 implements the Base
Restored abort model.