From: "H. Peter Anvin" <hpa@zytor.com>
To: Stefani Seibold <stefani@seibold.net>, Andi Kleen <ak@linux.intel.com>
Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
x86@kernel.org, tglx@linutronix.de, mingo@redhat.com,
aarcange@redhat.com, john.stultz@linaro.org, luto@amacapital.net,
xemul@parallels.com, gorcunov@openvz.org,
andriy.shevchenko@linux.intel.com,
Martin.Runge@rohde-schwarz.com, Andreas.Brief@rohde-schwarz.com
Subject: Re: [PATCH v13 8/9] Add 32 bit VDSO time support for 32 bit kernel
Date: Sun, 09 Feb 2014 12:11:08 -0800 [thread overview]
Message-ID: <52F7E0DC.7070103@zytor.com> (raw)
In-Reply-To: <1391946317.18067.11.camel@wall-e.seibold.net>
On 02/09/2014 03:45 AM, Stefani Seibold wrote:
>>
>> Yes the syscall does, but the vsyscall stub does not (for the !0x80 case)
>
> I cross check all kinds of vsyscall and all do save the ECX registers.
>
> So IMHO i see no register modification other than EAX, which is declared
> as the output register in the asm() directive.
>
That is, indeed, correct, as the 32-bit vsyscall stubs are explicitly
designed to be drop-in replacements for the int $0x80 instruction.
-hpa
next prev parent reply other threads:[~2014-02-09 20:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-08 21:29 [PATCH v13 0/9] Add 32 bit VDSO time function support stefani
2014-02-08 21:29 ` [PATCH v13 1/9] Make vsyscall_gtod_data handling x86 generic stefani
2014-02-08 21:29 ` [PATCH v13 2/9] Add new func _install_special_mapping() to mmap.c stefani
2014-02-08 21:29 ` [PATCH v13 3/9] revamp vclock_gettime.c stefani
2014-02-08 21:29 ` [PATCH v13 4/9] vclock_gettime.c __vdso_clock_gettime cleanup stefani
2014-02-08 21:29 ` [PATCH v13 5/9] replace VVAR(vsyscall_gtod_data) by gtod macro stefani
2014-02-08 21:29 ` [PATCH v13 6/9] cleanup __vdso_gettimeofday stefani
2014-02-08 21:29 ` [PATCH v13 7/9] introduce VVAR marco for vdso32 stefani
2014-02-08 21:29 ` [PATCH v13 8/9] Add 32 bit VDSO time support for 32 bit kernel stefani
2014-02-09 5:22 ` Andi Kleen
2014-02-09 7:21 ` Andi Kleen
2014-02-09 8:15 ` Stefani Seibold
2014-02-09 8:10 ` Stefani Seibold
2014-02-09 10:05 ` Andi Kleen
2014-02-09 10:43 ` Stefani Seibold
2014-02-09 11:45 ` Stefani Seibold
2014-02-09 20:11 ` H. Peter Anvin [this message]
2014-02-08 21:29 ` [PATCH v13 9/9] Add 32 bit VDSO time support for 64 " stefani
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