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From: "André Hentschel" <nerv@dawncrow.de>
To: linux-arch@vger.kernel.org
Subject: arm64: Request to add error code
Date: Tue, 15 Jan 2013 00:34:44 +0100	[thread overview]
Message-ID: <50F49614.3040403@dawncrow.de> (raw)

Hi,
i'm new to the list (my first kernel mailing list).
I'd like to request to add a way to distinguish a read from a write pagefault in userspace on arm64(aarch64).
(That's e.g. in a SIGSEGV handler attached with sigaction and SA_SIGINFO)
On arm you can use the bit at 0x800 in uc_mcontext.error_code to know which kind it is, but on arm64 i can't find a way.
(On most other popular architectures you can get that information, too)
I'd suggest to add a flag to siginfo.si_errno, or to make the esr available to the SIGSEGV handler.
Any hints or suggestions?

-- 

Best Regards, André Hentschel

             reply	other threads:[~2013-01-14 23:34 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-14 23:34 André Hentschel [this message]
2013-01-15 10:47 ` arm64: Request to add error code Catalin Marinas
2013-01-15 19:27   ` André Hentschel

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