Messages in this thread | | | Date | Wed, 24 Apr 2019 17:51:50 +0100 | From | Mark Rutland <> | Subject | Re: [RFC PATCH for 5.2 08/10] rseq/selftests: aarch64 code signature: handle big-endian environment |
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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.
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