From: Szabolcs Nagy <Szabolcs.Nagy@arm.com>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: nd <nd@arm.com>, Joseph Myers <joseph@codesourcery.com>,
Will Deacon <Will.Deacon@arm.com>, carlos <carlos@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
libc-alpha <libc-alpha@sourceware.org>,
Thomas Gleixner <tglx@linutronix.de>, Ben Maurer <bmaurer@fb.com>,
Peter Zijlstra <peterz@infradead.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Boqun Feng <boqun.feng@gmail.com>,
Dave Watson <davejwatson@fb.com>, Paul Turner <pjt@google.com>,
Rich Felker <dalias@libc.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-api <linux-api@vger.kernel.org>
Subject: Re: [PATCH 1/5] glibc: Perform rseq(2) registration at C startup and thread creation (v8)
Date: Tue, 23 Apr 2019 11:16:03 +0000 [thread overview]
Message-ID: <a1bd2595-b7ae-b06b-9c71-802901ed8587@arm.com> (raw)
In-Reply-To: <1531569198.1389.1555611422188.JavaMail.zimbra@efficios.com>
On 18/04/2019 19:17, Mathieu Desnoyers wrote:
> ----- On Apr 18, 2019, at 1:37 PM, Szabolcs Nagy Szabolcs.Nagy@arm.com wrote:
>> you have to add a documentation comment somewhere
>> explaining if RSEQ_SIG is the value that's passed to
>> the kernel and then aarch64 asm code has to use
>>
>> .inst endianfixup(RSEQ_SIG) // or
>> .word RSEQ_SIG
>
> Using ".word" won't allow objdump to show the instruction it
> maps to. It will consider it as data. So .inst is preferred here.
is there some specific reason you prefer .inst?
disassembling a canary value as data (that is
never executed, but loaded and compared by the
kernel as data) sounds more semantically correct
to me than showing it as an instruction.
i guess having it as an instruction can avoid
issues if some tools dislike .word in .text,
but otherwise .word seems better.
next prev parent reply other threads:[~2019-04-23 11:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190416173216.9028-1-mathieu.desnoyers@efficios.com>
2019-04-16 17:32 ` Mathieu Desnoyers
2019-04-17 15:59 ` Mathieu Desnoyers
2019-04-17 16:17 ` Joseph Myers
2019-04-17 19:56 ` Mathieu Desnoyers
2019-04-18 13:17 ` Mathieu Desnoyers
2019-04-18 14:48 ` Joseph Myers
2019-04-18 15:37 ` Mathieu Desnoyers
2019-04-18 15:33 ` Szabolcs Nagy
2019-04-18 15:41 ` Mathieu Desnoyers
2019-04-18 16:07 ` Szabolcs Nagy
2019-04-18 17:10 ` Mathieu Desnoyers
2019-04-18 17:37 ` Szabolcs Nagy
2019-04-18 18:17 ` Mathieu Desnoyers
2019-04-23 11:16 ` Szabolcs Nagy [this message]
2019-04-23 11:59 ` Ramana Radhakrishnan
2019-04-23 12:36 ` Mathieu Desnoyers
2019-04-16 17:32 ` [PATCH 2/5] glibc: sched_getcpu(): use rseq cpu_id TLS on Linux (v2) Mathieu Desnoyers
2019-04-18 15:33 ` Szabolcs Nagy
2019-04-18 15:45 ` Mathieu Desnoyers
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