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Re: [PATCH 02/11] nds32: ABI Implementation

From: Vincent Chen <vincentc at andestech dot com>
To: Florian Weimer <fweimer at redhat dot com>
Cc: "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>, "deanbo422 at gmail dot com" <deanbo422 at gmail dot com>, "Che-Wei Chuang (?????????)" <cnoize at andestech dot com>
Date: Mon, 14 May 2018 13:14:53 +0800
Subject: Re: [PATCH 02/11] nds32: ABI Implementation
References: <1525617685-32083-1-git-send-email-vincentc@andestech.com> <1525617685-32083-3-git-send-email-vincentc@andestech.com> <b1e026be-652c-ae15-0555-28be471fd64b@redhat.com>

On Sat, May 12, 2018 at 03:15:39PM +0800, Florian Weimer wrote:
> On 05/06/2018 04:41 PM, vincentc wrote:
> > +  $r26 - $r27 are temp registers for OS - no need to save.
> 
> Shouldn't you save them in case you decide to use them for a thread 
> pointer eventually or something like that?
> 
> Thanks,
> Florian

We do not save $r26, $r27 these two registers because these two register are
reserved for kernel space. In other words, these two registers shall not be used
in user space. Therefore, we needn't save these two registers to jmp_buf.

Thanks for your comment.

Best regards
Vincent Chen

Follow-Ups:
- Re: [PATCH 02/11] nds32: ABI Implementation
  - From: Florian Weimer

References:
- [PATCH 00/11] nds32 glibc Port v1
  - From: vincentc
- [PATCH 02/11] nds32: ABI Implementation
  - From: vincentc
- Re: [PATCH 02/11] nds32: ABI Implementation
  - From: Florian Weimer

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