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Re: [PATCH] livepatch: set -f{function,data}-sections compiler option


  • To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Wed, 2 Mar 2022 17:13:00 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 02 Mar 2022 16:13:08 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 02.03.2022 15:41, Jan Beulich wrote:
> On 02.03.2022 14:44, Roger Pau Monne wrote:
>> --- a/xen/arch/x86/xen.lds.S
>> +++ b/xen/arch/x86/xen.lds.S
>> @@ -88,6 +88,9 @@ SECTIONS
>>  
>>         *(.text.cold)
>>         *(.text.unlikely)
>> +#ifdef CONFIG_LIVEPATCH
>> +       *(.text.*)
>> +#endif
> 
> This coming after the "cold" and "unlikely" special sections and
> ahead of .fixup isn't very nice. Also from looking at the linker
> scripts ld supplies I'm getting the impression that there could/
> would then also be e.g. .text.cold.* and .text.unlikely.* which
> you'd want to separate.

Thinking about it, with -ffunction-sections startup code cannot
reasonably be placed in .text.startup, or else there would be
confusion with code originating from a function named startup().
But of course .text.startup.* is similarly difficult to arrange
for not ending up in the output's main .text, so adding
.text.startup.* and .text.exit.* later in the script wouldn't
gain us anything.

Jan




 


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