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Date:   Wed, 24 Apr 2019 17:51:50 +0100
From:   Mark Rutland <mark.rutland@arm.com>
To:     Will Deacon <will.deacon@arm.com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Peter Zijlstra <peterz@infradead.org>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
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Subject: Re: [RFC PATCH for 5.2 08/10] rseq/selftests: aarch64 code
 signature: handle big-endian environment
Message-ID: <20190424165150.GF21101@lakrids.cambridge.arm.com>
References: <20190424152502.14246-1-mathieu.desnoyers@efficios.com>
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 <20190424164538.GC18611@fuggles.cambridge.arm.com>
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On Wed, Apr 24, 2019 at 05:45:38PM +0100, Will Deacon wrote:
> On Wed, Apr 24, 2019 at 11:25:00AM -0400, Mathieu Desnoyers wrote:
> > +/*
> > + * aarch64 -mbig-endian generates mixed endianness code vs data:
> > + * little-endian code and big-endian data. Ensure the RSEQ_SIG signature
> > + * matches code endianness.
> > + */
> > +#define RSEQ_SIG_CODE	0xd428bc00	/* BRK #0x45E0.  */
> > +
> > +#ifdef __AARCH64EB__
> > +#define RSEQ_SIG_DATA	0x00bc28d4	/* BRK #0x45E0.  */
> 
> It would be neater to implement swab32 and use that with RSEQ_SIG_CODE,

If possible, marginally neater than that would be using
le32_to_cpu(RSEQ_SIG_CODE), without any ifdeffery necessary.

It looks like that's defined in tools/include/linux/kernel.h, but I'm
not sure if that gets pulled into your include path.

Thanks,
Mark.