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Re: [PATCH V2] AArch64 pauth: Indicate unmasked addresses in backtrace
- From: Tom Tromey <tom at tromey dot com>
- To: Pedro Alves <palves at redhat dot com>
- Cc: Alan Hayward <Alan dot Hayward at arm dot com>, "gdb-patches\@sourceware.org" <gdb-patches at sourceware dot org>, nd <nd at arm dot com>
- Date: Thu, 08 Aug 2019 10:58:47 -0600
- Subject: Re: [PATCH V2] AArch64 pauth: Indicate unmasked addresses in backtrace
- References: <20190730144123.11135-1-alan.hayward@arm.com> <728af5fa-8e3d-845c-d72f-60b1d2067643@redhat.com>
>>>>> "Pedro" == Pedro Alves <palves@redhat.com> writes:
Pedro> Hmm, I had suggested considering MI in the previous iteration, but
Pedro> I was just thinking of including the "[PAC]" text in the
Pedro> "addr" field. If we're adding a new field, then a few extra
Pedro> things need to be considered:
Pedro> #1 - documentation, both manual and NEWS should mention this new MI field.
Oops, I forgot about this. Sorry about that.
I don't think putting this information into the "addr" field is a good
idea. It's better, IMO, to let MI field names provide the structure,
rather than requiring clients to also parse the values of fields.
I realize MI isn't 100% clean on this topic, but we can still not make
it worse.
Pedro> #2 - calling the attribute "pac" makes it architecture specific.
I don't think this is such a big deal but at the same time any
reasonable name is fine by me.
Pedro> #3 - The MI attribute is called "pac", and its content is
Pedro> literally " [PAC]". I'd find that odd if I were a frontend author:
Pedro> the content is right aligned with a space, making doing anything with
Pedro> it other than appending it to the address text probably look odd,
Pedro> unless you bake in awareness of the attribute's text... If I saw
Pedro> an attribute named "pac", I'd expect it to be a boolean? At the
Pedro> least, the left space should not be part of the field, I think?
I think part of the pain here is an internal constraint, namely that the
CLI ui-out wouldn't know to rewrite the boolean value to something else
here. But perhaps that's something that could just be addressed
directly.
Tom