linux-kernel - Re: [PATCH] rust: add basic ELF sections parser

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Message-ID: <CAOZdJXW+PoFgxH+wPEum-kYvRmSRd8c4kaxvbNAq5dfZJiXapA@mail.gmail.com>
Date: Fri, 16 May 2025 11:28:14 -0500
From: Timur Tabi <timur@...nel.org>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Danilo Krummrich <dakr@...nel.org>, Greg KH <gregkh@...uxfoundation.org>, 
	John Hubbard <jhubbard@...dia.com>, Timur Tabi <timur@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH] rust: add basic ELF sections parser

On Fri, May 16, 2025 at 9:35 AM Alexandre Courbot <acourbot@...dia.com> wrote:
>
> We use ELF as a container format to associate binary blobs with named
> sections. Can we extract these sections into individual files that we
> load using request_firmware()? Why yes, we could.

Actually, I don't think we can.  This is the actual GSP-RM ELF image
you're talking about.  This comes packaged as one binary blob and it's
intended to be mostly opaque.  We can't just disassemble the ELF
sections and then re-assemble them in the driver.

Unfortunately, for pre-Hopper booting, we need to do a little
pre-processing on the image, referencing the ELF sections, and based
on data from fuses that cannot be read in user-space.