Re: [PATCH V7] amd64-mpx: initialize bnd register before performing inferior calls.

[Pedro Alves <palves at redhat dot com>]

On 02/14/2017 01:34 PM, Tedeschi, Walfred wrote:
> On 02/13/2017 09:33 AM, Tedeschi, Walfred wrote:
>> At the inferior call time all BND registers are set to the INIT state.
>> That covers 90% of the usage case and keeps the actual behavior of GDB.
>> In case it is desirable to investigate any  bound violation user can
>> add a breakpoint on the prolog of the function and
>> set the BND register there, I understand that this is the normal use
>> case for the debugger as well.
> In reality it did not work as expected. When an inferior call is done
> and there is a breakpoint in the executed GDB issues a message like:
> 
> "The program being debugged stopped while in a function called from GDB.
> Evaluation of the expression containing the function
> (foo) will be abandoned.
> When the function is done executing, GDB will silently stop."

This looks normal.  What were you expecting instead?

> Also after that no signal generated within the function call is reported.

Please clarify.

> Not sure if this a limitation or a bug. In case you think it is a bug i
> can add some entries in Bugzilla.

Thanks,
Pedro Alves