linux-kernel - Re: questions about rd{msr|tsc|pmc} instruction with x86-64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <df9815e70810160931s86c9058rc18d426ce278aa30@mail.gmail.com>
Date:	Fri, 17 Oct 2008 00:31:18 +0800
From:	"Jike Song" <albcamus@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	gcosta@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: questions about rd{msr|tsc|pmc} instruction with x86-64

On Thu, Oct 16, 2008 at 2:39 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Jike Song wrote:
>> {snip}
>
> "A" means rdx:rax on x86-64, not edx:eax.  For a 64-bit number, it means,
> literally, "one of rdx or rax"!  As you correctly point out, this is not how
> rdmsr works.
>
>        -hpa
>

Thanks, Peter!  So I misunderstood the gcc constraint 'A' for x86-64,
but seems the comment "while x86_64 returns at rax" still wrong,
should this be fixed?

-- 
Thanks,
Jike
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/