Re: [PATCH v6 00/25] Memory Tagging Support + AArch64 Linux implementation

[Luis Machado <luis.machado@linaro.org>]

Hi Simon,

On 3/23/21 7:50 PM, Simon Marchi wrote:
> On 2021-03-22 9:20 a.m., Luis Machado via Gdb-patches wrote:> Memory tagging improves memory safety by tagging various parts of memory and
>> raising exceptions when the allocation tag (the one associated with a range of
>> memory addresses) does not match the logical tag contained in a pointer that is
>> used to access the memory area.
>>
>> We already have an implementation of such a mechanism for sparc64 (ADI), but
>> it is target-specific and not exposed to the rest of GDB. This series aims to
>> make the infrastructure available to other targets that may wish to support
>> their specific memory tagging approaches. For AArch64 Linux this is called
>> MTE (Memory Tagging Extensions).
>>
>> The series is split into a set that deals with generic changes to GDB's
>> infrastructure (target methods, gdbarch hooks and remote packets), a set that
>> implements support for AArch64 Linux and one last set that implements new
>> commands, updates the documentation and adds tests.
>>
>> The goal is to make it so the architecture independent parts of GDB don't
>> need to interpret tag formats, given the formats are likely different
>> for each architecture.  For this reason, GDB will handle tags as a sequence of
>> bytes and will not assume a particular format.
>>
>> The architecture-specific code can handle the sequence of bytes appropriately.
> 
> Hi Luis,
> 
> Apart from the nits I pointed here and there, this is OK to merge.
> Thanks for this big chunk of work!

I've addressed those nits and pushed the series now.

Thanks a lot for all the reviews and for the patience to go through this 
series a few times.