From: Mike Grundy <grundym@us.ibm.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: jan.glauber@de.ibm.com, linux-kernel@vger.kernel.org,
systemtap@sources.redhat.com
Subject: Re: [PATCH] kprobes for s390 architecture
Date: Wed, 21 Jun 2006 17:34:00 -0000 [thread overview]
Message-ID: <20060621173436.GA7834@localhost.localdomain> (raw)
In-Reply-To: <1150907920.8295.10.camel@localhost>
On Wed, Jun 21, 2006 at 06:38:40PM +0200, Martin Schwidefsky wrote:
> You misunderstood me here. I'm not talking about storing the same piece
> of data to memory on each processor. I'm talking about isolating all
> other cpus so that the initiating cpu can store the breakpoint to memory
> without running into the danger that another cpu is trying to execute it
> at the same time. But probably the store should be atomic in regard to
> instruction fetching on the other cpus. It is only two bytes and it
> should be aligned.
So maybe something like this:
void smp_replace_instruction(void *info) {
struct ins_replace_args *parms;
parms = (struct ins_replace_args *) info;
*parms->addr = *parms->insn
}
void __kprobes arch_arm_kprobe(struct kprobe *p)
{
struct ins_replace_args parms;
parms.addr = p->addr;
parms.insn = BREAKPOINT_INSTRUCTION
preempt_disable();
smp_call_function(smp_replace_instruction, &parms, 0, 1);
preempt_enable();
}
Thanks
Mike
next prev parent reply other threads:[~2006-06-21 17:34 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-12 17:17 Mike Grundy
2006-06-12 19:40 ` Martin Schwidefsky
2006-06-21 4:28 ` Mike Grundy
2006-06-21 16:38 ` Martin Schwidefsky
2006-06-21 17:15 ` Mike Grundy
2006-06-27 11:58 ` Martin Schwidefsky
2006-06-21 17:34 ` Mike Grundy [this message]
2006-06-22 11:28 ` Jan Glauber
2006-06-22 16:36 ` Mike Grundy
2006-06-23 8:50 ` Jan Glauber
2006-06-23 14:39 ` Heiko Carstens
2006-06-22 1:38 ` Mike Grundy
2006-06-21 9:40 ` Jan Glauber
2006-06-21 16:23 ` Jan Glauber
[not found] <20060623150344.GL9446@osiris.boeblingen.de.ibm.com>
2006-06-23 16:04 ` [heiko.carstens@de.ibm.com: Re: [PATCH] kprobes for s390 architecture] Michael Grundy
2006-06-23 22:21 ` [PATCH] kprobes for s390 architecture Heiko Carstens
2006-06-24 12:16 ` Heiko Carstens
2006-06-24 14:27 ` Heiko Carstens
2006-06-26 8:10 ` Mike Grundy
2006-06-26 10:33 ` Heiko Carstens
2006-06-27 18:53 ` Martin Schwidefsky
2006-06-28 16:49 ` Heiko Carstens
2006-07-07 17:23 ` Mike Grundy
2006-07-07 17:27 ` Heiko Carstens
2006-07-07 19:51 ` Frank Ch. Eigler
2006-07-08 15:59 ` Mike Grundy
2006-07-08 18:54 ` Mike Grundy
2006-07-08 19:58 ` Mike Grundy
2006-07-10 9:31 ` Heiko Carstens
2006-07-10 22:20 ` Mike Grundy
2006-07-10 14:25 ` Frank Ch. Eigler
2006-07-10 15:51 ` Frank Ch. Eigler
2006-07-11 13:54 ` Mike Grundy
2006-07-11 14:13 ` Martin Schwidefsky
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