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From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: Huacai Chen <chenhc@lemote.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: "open list:MIPS" <linux-mips@vger.kernel.org>,
	Fuxin Zhang <zhangfx@lemote.com>,
	Zhangjin Wu <wuzhangjin@gmail.com>
Subject: Re: [PATCH V3 1/2] MIPS: Loongson-3: Enable COP2 usage in kernel
Date: Fri, 14 Aug 2020 21:16:37 +0800	[thread overview]
Message-ID: <f4cb6def-4b65-b829-5878-75dae95b0c39@flygoat.com> (raw)
In-Reply-To: <CAAhV-H5YqF5dcdFiBgVSXzu67QOKTFq3FME8ernswGts45GHfQ@mail.gmail.com>



在 2020/8/14 下午5:44, Huacai Chen 写道:
> Hi, Thomas,
>
> On Tue, Aug 11, 2020 at 8:08 PM Thomas Bogendoerfer
> <tsbogend@alpha.franken.de> wrote:
>> On Tue, Aug 11, 2020 at 02:45:05PM +0800, Huacai Chen wrote:
>>> Hi, Thomas and Jiaxun,
>>>
>>> On Tue, Aug 11, 2020 at 10:18 AM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote:
>>>>
>>>>
>>>> 在 2020/8/10 22:12, Thomas Bogendoerfer 写道:
>>>>> On Sun, Aug 09, 2020 at 10:53:13PM +0800, Jiaxun Yang wrote:
>>>>>> Thus we still need to enable CU2 with exception for user space, and we can
>>>>>> always enable CU2 in
>>>>>> kernel since kernel won't be compiled with hard-float. :-)
>>>>> I see, how about the patch below
>>>> That looks fine for me.
>>>> Is it good with you, Huacai?
>>> There are two problems:
>>> 1, zboot (arch/mips/boot/compressed/head.S) should be considered,
>>> because the initial value of Status may or may not contain CU2.
>> this comes with it's own memcpy/memset and stuff, I don't see a reason why
>> COP2 needs to be enabled there,
> gslq/gssq can also be generated by toolchains.

To correct myself, GSLQ/GSSQ won't be generated by current upstream GCC
with msoft-float but it is possible to happen with Loongson's GCC 4.9/7 
fork.

And I think we should care this case as well....

Thanks.

- Jiaxun

  reply	other threads:[~2020-08-14 13:17 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-02  4:55 [PATCH V3 1/2] MIPS: Loongson-3: Enable COP2 usage in kernel Huacai Chen
2020-05-02  4:55 ` [PATCH V3 2/2] MIPS: Loongson-3: Calculate ra properly when unwinding the stack Huacai Chen
2020-05-06  5:29 ` [PATCH V3 1/2] MIPS: Loongson-3: Enable COP2 usage in kernel Jiaxun Yang
2020-08-01  7:59   ` Huacai Chen
2020-08-05 12:10     ` Thomas Bogendoerfer
2020-08-05 13:51       ` Jiaxun Yang
2020-08-06  1:15         ` Huacai Chen
2020-08-07 13:13         ` Thomas Bogendoerfer
2020-08-07 13:25           ` Jiaxun Yang
2020-08-07 13:36             ` Thomas Bogendoerfer
2020-08-09 14:53             ` Jiaxun Yang
2020-08-10 14:12               ` Thomas Bogendoerfer
2020-08-11  2:16                 ` Jiaxun Yang
2020-08-11  6:45                   ` Huacai Chen
2020-08-11 12:06                     ` Thomas Bogendoerfer
2020-08-14  9:44                       ` Huacai Chen
2020-08-14 13:16                         ` Jiaxun Yang [this message]
2020-08-26 12:46                         ` Thomas Bogendoerfer
2020-08-27  3:48                           ` Huacai Chen
2020-08-28  8:42                             ` Thomas Bogendoerfer
2020-08-28  9:21                               ` Huacai Chen
2020-08-28  9:33                                 ` Thomas Bogendoerfer
2020-08-28  9:52                                   ` Huacai Chen
2020-08-28 11:12                                     ` Thomas Bogendoerfer
2020-09-02  6:54                           ` Huacai Chen
2020-09-03  8:43                             ` Thomas Bogendoerfer

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