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Date:   Wed, 24 Apr 2019 13:00:54 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To:     Mark Rutland <mark.rutland@arm.com>
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        Peter Zijlstra <peterz@infradead.org>,
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        Andrew Morton <akpm@linux-foundation.org>,
        Russell King <linux@arm.linux.org.uk>,
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Subject: Re: [RFC PATCH for 5.2 08/10] rseq/selftests: aarch64 code
 signature: handle big-endian environment
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Thread-Topic: rseq/selftests: aarch64 code signature: handle big-endian environment
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----- On Apr 24, 2019, at 12:51 PM, Mark Rutland mark.rutland@arm.com wrote:

> 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.

Considering that those RSEQ_SIG* define will end up in public bits/rseq.h
headers within glibc, I'm tempted to keep the amount of dependencies on
external headers to a minimum, if it's OK with you.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com