From: David Mosberger <davidm@napali.hpl.hp.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Daniel Jacobowitz <dan@debian.org>,
george anzinger <george@mvista.com>,
Jim Houston <jim.houston@ccur.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
LKML <linux-kernel@vger.kernel.org>, <anton@samba.org>,
"David S. Miller" <davem@redhat.com>, <ak@muc.de>,
<davidm@hpl.hp.com>, <schwidefsky@de.ibm.com>, <ralf@gnu.org>,
<willy@debian.org>
Subject: Re: [PATCH] compatibility syscall layer (lets try again)
Date: Mon, 9 Dec 2002 09:27:06 -0800 [thread overview]
Message-ID: <15860.53866.127553.424553@napali.hpl.hp.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0212090828460.3397-100000@home.transmeta.com>
>>>>> On Mon, 9 Dec 2002 08:48:13 -0800 (PST), Linus Torvalds <torvalds@transmeta.com> said:
Linus> Architecture maintainers, can you comment on how easy/hard it
Linus> is to do the same thing on your architectures? I _assume_
Linus> it's trivial (akin to the three-liner register state change
Linus> in i386/kernel/signal.c).
It's not trivial on ia64: we keep the syscall arguments in registers
(the stacked registers, to be precise), so to modify them, we need to
(a) flush the stacked registers to memory and (b) find the frame that
contains the syscall arguments, (c) patch the values in memory, and
(d) reload the stacked registers. It's doable (like you say, ptrace()
does it already), but that's about the best I can say about it...
--david
next prev parent reply other threads:[~2002-12-09 17:19 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-04 7:02 Stephen Rothwell
2002-12-04 7:07 ` [PATCH] compatibility syscall layer - PPC64 Stephen Rothwell
2002-12-06 23:03 ` Anton Blanchard
2002-12-04 7:16 ` [PATCH] compatibility syscall layer - SPARC64 Stephen Rothwell
2002-12-04 7:18 ` [PATCH] compatibility syscall layer - X86_64 Stephen Rothwell
2002-12-04 11:29 ` Andi Kleen
2002-12-04 7:26 ` [PATCH] compatibility syscall layer - IA64 Stephen Rothwell
2002-12-04 7:37 ` David Mosberger
2002-12-04 7:28 ` [PATCH] compatibility syscall layer (lets try again) Stephen Rothwell
2002-12-04 7:29 ` [PATCH] compatibility syscall layer - PARISC Stephen Rothwell
2002-12-04 7:30 ` [PATCH] compatibility syscall layer (lets try again) Stephen Rothwell
2002-12-04 7:33 ` Stephen Rothwell
2002-12-04 11:57 ` Pavel Machek
2002-12-04 16:54 ` Linus Torvalds
2002-12-04 16:54 ` David S. Miller
2002-12-04 17:05 ` Linus Torvalds
2002-12-04 19:56 ` george anzinger
2002-12-04 20:07 ` Linus Torvalds
2002-12-04 20:56 ` Daniel Jacobowitz
2002-12-04 22:09 ` David S. Miller
2002-12-04 22:31 ` george anzinger
2002-12-04 22:39 ` David S. Miller
2002-12-04 22:42 ` Linus Torvalds
2002-12-04 23:42 ` Jim Houston
2002-12-05 0:18 ` Linus Torvalds
2002-12-05 2:01 ` george anzinger
2002-12-05 2:51 ` Linus Torvalds
2002-12-05 3:10 ` Andi Kleen
2002-12-05 3:46 ` george anzinger
2002-12-05 4:11 ` Linus Torvalds
2002-12-05 7:10 ` george anzinger
2002-12-05 9:48 ` george anzinger
2002-12-05 15:24 ` Jim Houston
2002-12-05 16:35 ` george anzinger
2002-12-06 0:03 ` Richard Henderson
2002-12-05 17:03 ` Linus Torvalds
2002-12-06 9:17 ` george anzinger
2002-12-06 17:57 ` Linus Torvalds
2002-12-06 19:20 ` Linus Torvalds
2002-12-06 20:09 ` [PATCH] compatibility syscall layer (let's " Jim Houston
2002-12-06 20:33 ` george anzinger
2002-12-06 20:18 ` [PATCH] compatibility syscall layer (lets " george anzinger
2002-12-06 21:12 ` Linus Torvalds
2002-12-06 21:56 ` Jim Houston
2002-12-06 22:58 ` Linus Torvalds
2002-12-07 2:25 ` george anzinger
2002-12-06 23:08 ` george anzinger
2002-12-08 20:41 ` David S. Miller
2002-12-09 6:18 ` Stephen Rothwell
2002-12-09 15:41 ` Daniel Jacobowitz
2002-12-09 16:48 ` Linus Torvalds
2002-12-09 17:27 ` David Mosberger [this message]
2002-12-09 20:22 ` David S. Miller
2002-12-09 17:49 ` Jim Houston
2002-12-09 17:57 ` Linus Torvalds
2002-12-09 23:30 ` Paul Mackerras
2002-12-10 23:07 ` george anzinger
2002-12-11 7:10 ` Daniel Jacobowitz
2002-12-11 8:11 ` george anzinger
2002-12-11 8:26 ` Daniel Jacobowitz
2002-12-10 11:08 ` Jamie Lokier
2002-12-05 2:27 ` Jim Houston
2002-12-09 16:58 Mikael Starvik
2002-12-09 17:35 ` Linus Torvalds
2002-12-09 18:46 ` David Mosberger
2002-12-10 0:13 ` Paul Mackerras
2002-12-10 23:11 ` george anzinger
2002-12-09 17:16 Martin Schwidefsky
2002-12-09 17:33 ` Linus Torvalds
2002-12-09 20:18 ` David S. Miller
2002-12-09 17:56 Martin Schwidefsky
2002-12-09 18:20 ` Linus Torvalds
2002-12-10 14:40 ` Keith Owens
2002-12-09 18:41 Martin Schwidefsky
2002-12-09 18:52 ` Linus Torvalds
2002-12-10 8:20 ` george anzinger
2002-12-10 8:42 Martin Schwidefsky
2002-12-10 17:17 Martin Schwidefsky
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