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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Michael Schmitz <schmitzmic@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	Linux-Arch <linux-arch@vger.kernel.org>,
	linux-m68k <linux-m68k@lists.linux-m68k.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Andreas Schwab <schwab@linux-m68k.org>
Subject: Re: [PATCH v4 3/3] m68k: track syscalls being traced with shallow user context stack
Date: Sun, 25 Jul 2021 14:00:14 -0700	[thread overview]
Message-ID: <CAHk-=wgVFUJAD62jtpbbKddu1ZeGF+nR4VuTGzQjS_ncCa5nQQ@mail.gmail.com> (raw)
In-Reply-To: <f99d3d82-150b-62fc-3b38-141710a4826e@gmail.com>

On Sun, Jul 25, 2021 at 1:48 PM Michael Schmitz <schmitzmic@gmail.com> wrote:
>
> Just out of interest - what would be the correct way to set/clear a
> single bit on Coldfire? Add/subtract the 1<<bit value?

I think BSET/BCLR are the way to go.

Or, alternatively, put the constant in a register, and use a longword
memory access. The arithmetic ops don't do immediates _and_ memory
operands in Coldfire, and they don't do byte ops.

Or something like that.

              Linus

  reply	other threads:[~2021-07-25 21:00 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-23  0:21 [PATCH v4 0/3] m68k: Improved switch stack handling Michael Schmitz
2021-06-23  0:21 ` [PATCH v4 1/3] m68k: save extra registers on more syscall entry points Michael Schmitz
2021-06-23  0:21 ` [PATCH v4 2/3] m68k: correctly handle IO worker stack frame set-up Michael Schmitz
2021-06-23  0:21 ` [PATCH v4 3/3] m68k: track syscalls being traced with shallow user context stack Michael Schmitz
2021-07-25 10:05   ` Geert Uytterhoeven
2021-07-25 20:48     ` Michael Schmitz
2021-07-25 21:00       ` Linus Torvalds [this message]
2021-07-26 14:27         ` Greg Ungerer
2021-07-15 13:29 ` [PATCH v4 0/3] m68k: Improved switch stack handling Eric W. Biederman
2021-07-15 23:10   ` Michael Schmitz
2021-07-17  5:38     ` Michael Schmitz
2021-07-17 18:52       ` Eric W. Biederman
2021-07-17 20:09         ` Michael Schmitz
2021-07-17 23:04           ` Michael Schmitz
2021-07-18 10:47             ` Andreas Schwab
2021-07-18 19:47               ` Michael Schmitz
2021-07-18 20:59                 ` Brad Boyer
2021-07-19  3:15                   ` Michael Schmitz
2021-07-20 20:32             ` Eric W. Biederman
2021-07-20 22:16               ` Michael Schmitz
2021-07-22 14:49                 ` Eric W. Biederman
2021-07-23  4:23                   ` Michael Schmitz
2021-07-23 22:31                     ` Eric W. Biederman
2021-07-23 23:52                       ` Michael Schmitz
2021-07-24 12:05                         ` Andreas Schwab
2021-07-25  7:44                           ` Michael Schmitz
2021-07-25 10:12                             ` Brad Boyer
2021-07-26  2:00                               ` Michael Schmitz
2021-07-26 19:36                                 ` [RFC][PATCH] signal/m68k: Use force_sigsegv(SIGSEGV) in fpsp040_die Eric W. Biederman
2021-07-26 20:13                                   ` Andreas Schwab
2021-07-26 20:29                                     ` Eric W. Biederman
2021-07-26 21:25                                       ` Andreas Schwab
2021-07-26 20:29                                   ` Michael Schmitz
2021-07-26 21:08                                     ` [PATCH] " Eric W. Biederman
2021-08-25 15:56                                       ` Eric W. Biederman
2021-08-26 12:15                                       ` Geert Uytterhoeven
2021-07-25 11:53                             ` [PATCH v4 0/3] m68k: Improved switch stack handling Andreas Schwab

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