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

[Simon Marchi <simon.marchi@polymtl.ca>]

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!

Simon