Re: [Minios-devel] [PATCH v3 21/43] arm64: define the CALLEE_SAVED_REGISTERS

[Huang Shijie <shijie.huang@xxxxxxx>]

On Wed, Apr 25, 2018 at 10:23:43PM +0100, Julien Grall wrote:
> 
> 
> On 25/04/2018 18:33, Julien Grall wrote:
> >Hi,
> 
> Hi,
> 
> >
> >On 16/04/18 07:32, Huang Shijie wrote:
> >>In the arm64, the callee-saved registers are x19 ~ x29.
> >
> >s/In the/On/.
> >
> >I think it would be good to mention where that convention comes from as
> >this is not very obvious for non-arm expert :). This convention is from
> >AAPCS64 [1].
okay, I will add this in the next version.
> 
> Also, you want to explain why x19-x29. At first this is not obvious because
> the table call x29 "fp" and x19-x28 "callee-saved registers". It took me a
> bit to find in the spec the line saying "A subroutine invocation must
> preserve the contents of the registers r19-r29 and SP."

okay, I add more information for x19 ~ x28?

Thanks
Huang Shijie

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