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Re: [PATCH 3/4] xen/ppc: Implement early serial printk on pseries
- To: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 22 Jun 2023 10:03:55 +0200
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- Cc: tpearson@xxxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 22 Jun 2023 08:04:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.06.2023 20:21, Shawn Anastasio wrote:
> On 6/21/23 12:54 PM, Andrew Cooper wrote:
>> Given:
>>
>> #define r0 0
>>
>> do the assemblers really not understand register names? That seems mad.
>
> Yeah as surprising as it is, ppc64 assemblers don't handle register
> names by default. I think at some point a flag was added to GAS (and
> probably llvm? will have to check) to define them for you, but I'm not
> sure which version introduced the flag.
Isn't it that you simply need to prefix them with %? That looks to be
working for me without any special options in PPC code I maintain for
an entirely different purpose.
Jan
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