From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Thomas Leonard <talex5@gmail.com>,
Samuel Thibault <samuel.thibault@ens-lyon.org>,
Ian Campbell <Ian.Campbell@citrix.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Anil Madhavapeddy <anil@recoil.org>,
David Scott <Dave.Scott@eu.citrix.com>,
KarimAllah Ahmed <karim.allah.ahmed@gmail.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH ARM v8 3/4] mini-os: arm: build system
Date: Mon, 17 Nov 2014 11:47:25 +0000 [thread overview]
Message-ID: <5469E04D.2090500@citrix.com> (raw)
In-Reply-To: <CAG4opy8Uk87Hof5ufyJgfW-1dzxaKLq7_joGKYiGaTPBL6=tMw@mail.gmail.com>
On 17/11/14 11:42, Thomas Leonard wrote:
> On 26 October 2014 10:25, Thomas Leonard <talex5@gmail.com> wrote:
>> On 26 October 2014 09:55, Samuel Thibault <samuel.thibault@ens-lyon.org> wrote:
>>> Thomas Leonard, le Sun 26 Oct 2014 09:46:09 +0000, a écrit :
>>>> 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.
>
>
Kernel code (intended for ring0) cannot use red zones as a stack switch
doesn't occur when an exception/interrupt occurs. Compiling any kernel
code with red zone support leads to subtle clobbering of state.
~Andrew
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next prev parent reply other threads:[~2014-11-17 11:47 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-03 9:20 [PATCH ARM v8 0/4] mini-os: initial ARM support Thomas Leonard
2014-10-03 9:20 ` [PATCH ARM v8 1/4] mini-os: arm: time Thomas Leonard
2014-10-21 10:50 ` Ian Campbell
2014-10-21 14:07 ` [PATCH incomplete] xen: arm: wallclock support (incomplete, needs work/refactoring) Ian Campbell
2014-10-26 9:51 ` [PATCH ARM v8 1/4] mini-os: arm: time Thomas Leonard
2014-10-27 10:34 ` Ian Campbell
2014-11-13 16:29 ` Thomas Leonard
2014-11-14 10:29 ` Ian Campbell
2014-11-19 20:57 ` Konrad Rzeszutek Wilk
2015-01-08 15:52 ` Ian Campbell
2015-01-08 15:58 ` Thomas Leonard
2015-01-08 16:04 ` Ian Campbell
2014-10-03 9:20 ` [PATCH ARM v8 2/4] mini-os: arm: interrupt controller Thomas Leonard
2014-10-21 11:00 ` Ian Campbell
2014-10-21 14:26 ` Julien Grall
2014-10-21 15:16 ` Ian Campbell
2014-10-21 15:22 ` Julien Grall
2014-10-21 15:35 ` Ian Campbell
2014-10-21 16:03 ` Julien Grall
2014-10-21 18:14 ` Anil Madhavapeddy
2014-10-21 19:18 ` Ian Campbell
2014-10-21 21:54 ` Samuel Thibault
2014-10-22 9:03 ` Ian Campbell
2014-10-22 13:06 ` Julien Grall
2014-10-22 13:14 ` Samuel Thibault
2014-10-28 15:15 ` Thomas Leonard
2014-10-28 15:25 ` Julien Grall
2014-10-28 15:43 ` Thomas Leonard
2014-10-28 15:51 ` Julien Grall
2014-11-14 10:22 ` Thomas Leonard
2014-11-14 11:33 ` Julien Grall
2014-11-14 11:42 ` Ian Campbell
2014-11-14 11:48 ` Julien Grall
2014-11-14 12:01 ` Ian Campbell
2014-10-03 9:20 ` [PATCH ARM v8 3/4] mini-os: arm: build system Thomas Leonard
2014-10-21 11:44 ` Ian Campbell
2014-10-21 21:50 ` Samuel Thibault
2014-10-22 9:01 ` Ian Campbell
2014-10-22 9:59 ` Samuel Thibault
2014-10-26 9:46 ` Thomas Leonard
2014-10-26 9:55 ` Samuel Thibault
2014-10-26 10:25 ` Thomas Leonard
2014-11-17 11:42 ` Thomas Leonard
2014-11-17 11:45 ` Ian Campbell
2014-11-17 11:47 ` Andrew Cooper [this message]
2014-11-17 11:47 ` Samuel Thibault
2014-10-03 9:20 ` [PATCH ARM v8 4/4] mini-os: arm: show registers, stack and exception vector on fault Thomas Leonard
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