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From: 王洪亮 <wanghongliang@loongson.cn>
To: musl@lists.openwall.com
Subject: Re: [musl] Re: add loongarch64 port
Date: Fri, 8 Apr 2022 10:21:15 +0800	[thread overview]
Message-ID: <8dfcd620-4143-7450-8429-a89ed2264620@loongson.cn> (raw)
In-Reply-To: <20220406160042.GB8499@voyager>


在 2022/4/7 上午12:00, Markus Wichmann 写道:
> On Wed, Apr 06, 2022 at 10:08:24AM +0800, 王洪亮 wrote:
>> Hi, Rich
>>
>>
>> within __clone() implement __NR_clone3 syscall,
>>
>> will that confusion between clone and clone3?
>>
>>
>> Hongliang Wang
>>
>>
>>
> __clone() is a function with a defined interface. How it is implemented
> is not given in the name. Why should __clone() have to be implemented
> using the SYS_clone system call? If I understood the thread so far
> correctly, the final kernel will not even have SYS_clone.
>
> Compare with open(), which is often implemented in terms of SYS_openat
> instead of SYS_open. Or qsort(), which, despite the name, is rarely
> implemented as a quicksort.
>
> So no, there will be no confusion of system calls because a function is
> not implemented in terms of the system call of the same name, as long as
> the function fulfills the defined interface.
>
> Ciao,
> Markus

Hi,

I agree this point.
In the implementation,I found a problem:
In order to implement __NR_clone3 syscall in __clone(),
I need to fill struct clone_args,I found clone_args.stack
point to the lowest address of stack,but the input parameter
"stack" of __clone() point to stack bottom(STACK_GROWS_DOWN),
because of no stack_size,I can't convert between them.
Do you have any good suggestions?


Hongliang Wang


  reply	other threads:[~2022-04-08  2:21 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-31  6:20 王洪亮
2022-03-31  8:14 ` Arnd Bergmann
2022-04-01  7:40   ` 王洪亮
2022-04-01  7:48     ` Arnd Bergmann
2022-04-02  6:19       ` 王洪亮
2022-04-02  7:21         ` Rich Felker
2022-04-02  9:53           ` 王洪亮
2022-04-27  1:58   ` 王洪亮
2022-04-27  2:13     ` Rich Felker
2022-03-31 18:47 ` Rich Felker
2022-04-02  7:59   ` 王洪亮
2022-04-06  2:08     ` 王洪亮
2022-04-06 16:00       ` Markus Wichmann
2022-04-08  2:21         ` 王洪亮 [this message]
2022-04-08  6:46           ` Arnd Bergmann
2022-04-09  3:54             ` 王洪亮
2022-04-09 11:06               ` Arnd Bergmann
2022-04-09 13:19                 ` Rich Felker
2022-04-09 13:30                   ` Rich Felker
2022-04-10 10:30                     ` Arnd Bergmann
2022-04-10 15:26                       ` Rich Felker
2022-04-11  8:03                         ` Arnd Bergmann
2022-04-11 12:11                           ` Rich Felker
2022-04-11 13:01                             ` Arnd Bergmann
2022-04-12  1:11                               ` 王洪亮
2022-04-13  1:16                                 ` 王洪亮
2022-04-13  7:26                       ` Christian Brauner
2022-04-13  8:26                         ` Arnd Bergmann
2022-04-13  9:04                           ` Christian Brauner
2022-04-13 13:25                             ` Arnd Bergmann
2022-04-13 14:09                               ` Rich Felker
2022-04-14  9:36                                 ` Christian Brauner
2022-04-20  9:09                                   ` 王洪亮
2022-04-20 13:33                                     ` Christian Brauner
2022-04-20 13:54                                       ` Rich Felker
2022-04-21  6:54                                         ` 王洪亮
2022-04-14  9:36                               ` Christian Brauner
2022-04-13  7:19                   ` Christian Brauner
2022-04-13 14:06                     ` Rich Felker
2022-04-11  3:40                 ` 王洪亮
  -- strict thread matches above, loose matches on Subject: below --
2022-03-22  3:52 [musl] " 王洪亮
2022-03-29  8:12 ` [musl] " 王洪亮
2022-03-29  8:26   ` Arnd Bergmann

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