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[PATCH 2/2][Binutils][Arm]: Fix LSB of GOT for Thumb2 only PLT

Tamar Christina Tamar.Christina@arm.com
Wed Apr 1 09:28:55 GMT 2020 
Hi Amol,

> -----Original Message-----
> From: Amol <suratiamol@gmail.com>
> Sent: Tuesday, March 31, 2020 11:44 AM
> To: Tamar Christina <Tamar.Christina@arm.com>
> Cc: binutils@sourceware.org; nd <nd@arm.com>; Richard Earnshaw
> <Richard.Earnshaw@arm.com>; nickc@redhat.com; Ramana Radhakrishnan
> <Ramana.Radhakrishnan@arm.com>
> Subject: Re: [PATCH 2/2][Binutils][Arm]: Fix LSB of GOT for Thumb2 only PLT
> 
> Hi Tamar,
> 
> On 30/03/2020, Tamar Christina <tamar.christina@arm.com> wrote:
> > However I have not been able to do an execution test since I do not
> > have a way to actually test this. I am hoping the user who reported it
> > can test it but the patch is sound based on principles.
> >
> 
> The issue was originally reported on Arm's community by a user rgujju [1]; I
> was just the debugger.
> 
> > Amol would you be able to confirm the patch works on your setup?
> >
> 
> The .got entries for both the binaries
>    (a) on the ld/16017, and
>    (b) on the setup at [1],
> now have the LSB set, where previously they did not.
> 
> I tested the setup at [1], but on qemu alone; the control now successfully
> jumps to the plt0 stub, where previously it would just crash attempting that
> jump.

Thanks for testing!

> 
> If it isn't too late, you may want to flag rgujju as the reporter of the bug.
> Apologies for any inconvenience caused.
> 
> [1] https://community.arm.com/developer/ip-
> products/processors/f/cortex-m-forum/45919/gcc-does-not-generate-
> correct-code-while-building-pic

Oh..  I didn't even know about this section of community.arm.com.. Thanks for bringing the bug to our attention!

I'll credit rgujju for reporting it.

Thanks,
Tamar
> 
> Thanks,
> amol
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