linux-kernel - Re: [PATCH v8 03/28] x86/asm: annotate relocate

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Date:   Thu, 15 Aug 2019 10:37:37 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 03/28] x86/asm: annotate relocate_kernel

On Thu, Aug 08, 2019 at 12:38:29PM +0200, Jiri Slaby wrote:
> There are functions in relocate_kernel which are not annotated. This
					^
					_{32,64}.c

> makes automatic annotations rather hard. So annotate all the functions
> now.
> 
> Note that these are not C-like functions, so we do not use FUNC, but
> CODE markers. Also they are not aligned, so we use the NOALIGN versions:
> - SYM_CODE_START_NOALIGN
> - SYM_CODE_START_LOCAL_NOALIGN
> - SYM_CODE_END
> 
> In return, we get:
>   0000   108 NOTYPE  GLOBAL DEFAULT    1 relocate_kernel
>   006c   165 NOTYPE  LOCAL  DEFAULT    1 identity_mapped
>   0146   127 NOTYPE  LOCAL  DEFAULT    1 swap_pages
>   0111    53 NOTYPE  LOCAL  DEFAULT    1 virtual_mapped

It would be cool if those NOTYPE objects could be marked as OS-specific:

>From /usr/include/elf.h:

#define STT_LOOS        10              /* Start of OS-specific */

to denote that they're special but gas doesn't seem to support that type
out of the box at least.

Oh well...

-- 
Regards/Gruss,
    Boris.

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