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From: Nicholas Piggin <npiggin@gmail.com>
To: Nicholas Piggin via Libc-alpha <libc-alpha@sourceware.org>,
	Szabolcs Nagy <nsz@port70.net>
Cc: libc-dev@lists.llvm.org, Rich Felker <dalias@libc.org>,
	linuxppc-dev@lists.ozlabs.org, musl@lists.openwall.com
Subject: Re: [musl] Powerpc Linux 'scv' system call ABI proposal take 2
Date: Mon, 20 Apr 2020 10:27:58 +1000	[thread overview]
Message-ID: <1587341904.1r83vbudyf.astroid@bobo.none> (raw)
In-Reply-To: <20200416095800.GC23945@port70.net>

Excerpts from Szabolcs Nagy's message of April 16, 2020 7:58 pm:
> * Nicholas Piggin via Libc-alpha <libc-alpha@sourceware.org> [2020-04-16 10:16:54 +1000]:
>> Well it would have to test HWCAP and patch in or branch to two 
>> completely different sequences including register save/restores yes.
>> You could have the same asm and matching clobbers to put the sequence
>> inline and then you could patch the one sc/scv instruction I suppose.
> 
> how would that 'patch' work?
> 
> there are many reasons why you don't
> want libc to write its .text

I guess I don't know what I'm talking about when it comes to libraries. 
Shame if there is no good way to load-time patch libc. It's orthogonal
to the scv selection though -- if you don't patch you have to 
conditional or indirect branch however you implement it.

Thanks,
Nick

  reply	other threads:[~2020-04-20  0:31 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-15 21:45 Powerpc Linux 'scv' system call ABI proposal take 2 Nicholas Piggin
2020-04-15 22:55 ` [musl] " Rich Felker
2020-04-16  0:16   ` Nicholas Piggin
2020-04-16  0:48     ` Rich Felker
2020-04-16  2:24       ` Nicholas Piggin
2020-04-16  2:35         ` Rich Felker
2020-04-16  2:53           ` Nicholas Piggin
2020-04-16  3:03             ` Rich Felker
2020-04-16  3:41               ` Nicholas Piggin
2020-04-16 20:18             ` Florian Weimer
2020-04-16  9:58     ` Szabolcs Nagy
2020-04-20  0:27       ` Nicholas Piggin [this message]
2020-04-20  1:29         ` Rich Felker
2020-04-20  2:08           ` Nicholas Piggin
2020-04-20 21:17             ` Szabolcs Nagy
2020-04-21  9:57               ` Florian Weimer
2020-04-16 15:21     ` Jeffrey Walton
2020-04-16 15:40       ` Rich Felker
2020-04-16  4:48   ` Florian Weimer
2020-04-16 15:35     ` Rich Felker
2020-04-16 16:42       ` Florian Weimer
2020-04-16 16:52         ` Rich Felker
2020-04-16 18:12           ` Florian Weimer
2020-04-16 23:02             ` Segher Boessenkool
2020-04-17  0:34               ` Rich Felker
2020-04-17  1:48                 ` Segher Boessenkool
2020-04-17  8:34                   ` Florian Weimer
2020-04-16 14:16   ` Adhemerval Zanella
2020-04-16 15:37     ` Rich Felker
2020-04-16 17:50       ` Adhemerval Zanella
2020-04-16 17:59         ` Rich Felker
2020-04-16 18:18           ` Adhemerval Zanella
2020-04-16 18:31             ` Rich Felker
2020-04-16 18:44               ` Rich Felker
2020-04-16 18:52               ` Adhemerval Zanella
2020-04-20  0:46                 ` Nicholas Piggin
2020-04-20  1:10               ` Nicholas Piggin
2020-04-20  1:34                 ` Rich Felker
2020-04-20  2:32                   ` Nicholas Piggin
2020-04-20  4:09                     ` Rich Felker
2020-04-20  4:31                       ` Nicholas Piggin
2020-04-20 17:27                         ` Rich Felker
2020-04-22  6:18                           ` Nicholas Piggin
2020-04-22  6:29                             ` Nicholas Piggin
2020-04-23  2:36                             ` Rich Felker
2020-04-23 12:13                               ` Adhemerval Zanella
2020-04-23 16:18                                 ` Rich Felker
2020-04-23 16:35                                   ` Adhemerval Zanella
2020-04-23 16:43                                     ` Rich Felker
2020-04-23 17:15                                       ` Adhemerval Zanella
2020-04-23 17:42                                         ` Rich Felker
2020-04-25  3:40                                           ` Nicholas Piggin
2020-04-25  4:52                                             ` Rich Felker
2020-04-25  3:30                               ` Nicholas Piggin
2020-04-21 12:28                 ` David Laight
2020-04-21 14:39                   ` Rich Felker
2020-04-21 15:00                     ` Adhemerval Zanella
2020-04-21 15:31                       ` David Laight
2020-04-22  6:54                       ` Nicholas Piggin
2020-04-22  7:15                         ` [musl] " Florian Weimer
2020-04-22  7:31                           ` Nicholas Piggin
2020-04-22  8:11                             ` Florian Weimer

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