Re: [Xen-devel] [PATCH ARM v8 3/4] mini-os: arm: build system

[Thomas Leonard <talex5@xxxxxxxxx>]

On 26 October 2014 10:25, Thomas Leonard <talex5@xxxxxxxxx> wrote:
> On 26 October 2014 09:55, Samuel Thibault <samuel.thibault@xxxxxxxxxxxx> 
> wrote:
>> Thomas Leonard, le Sun 26 Oct 2014 09:46:09 +0000, a Ãcrit :
>>> Could you say a bit more about the linker problems you had?
>>
>> Really digging in the archives this time :)
>>
>> ia64-specific:
>> http://lists.xen.org/archives/html/xen-ia64-devel/2008-03/msg00126.html
>> http://lists.xen.org/archives/html/xen-ia64-devel/2008-12/msg00070.html
>> x86_64-specific (missing red zone support)
>> http://lists.xen.org/archives/html/xen-ia64-devel/2008-02/msg00251.html
>>
>> So I guess it could be OK on arm, but you have to make sure that Mini-OS
>> implements the whole ABI that gcc will use. Testing is not enough, I got
>> hit by the red zone for instance.
>
> On ARM, we have a separate stack for the IRQ handler, so the red zone
> at least shouldn't be a problem.

Incidentally, why doesn't Mini-OS/x86 use a red zone? I assume there's
a worthwhile performance benefit to it, and it would prevent subtle
bugs when software is accidentally compiled for the normal ABI.


-- 
Dr Thomas Leonard        http://0install.net/
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