Dave Martin 27e64b4be4
regset: Add support for dynamically sized regsets ...
Currently the regset API doesn't allow for the possibility that
regsets (or at least, the amount of meaningful data in a regset)
may change in size.
In particular, this results in useless padding being added to
coredumps if a regset's current size is smaller than its
theoretical maximum size.
This patch adds a get_size() function to struct user_regset.
Individual regset implementations can implement this function to
return the current size of the regset data. A regset_size()
function is added to provide callers with an abstract interface for
determining the size of a regset without needing to know whether
the regset is dynamically sized or not.
The only affected user of this interface is the ELF coredump code:
This patch ports ELF coredump to dump regsets with their actual
size in the coredump. This has no effect except for new regsets
that are dynamically sized and provide a get_size() implementation.
Signed-off-by: Dave Martin <Dave.Martin@arm.com >
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com >
Cc: Oleg Nesterov <oleg@redhat.com >
Cc: Alexander Viro <viro@zeniv.linux.org.uk >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: Ingo Molnar <mingo@redhat.com >
Cc: "H. Peter Anvin" <hpa@zytor.com >
Cc: Dmitry Safonov <dsafonov@virtuozzo.com >
Cc: H. J. Lu <hjl.tools@gmail.com >
Signed-off-by: Will Deacon <will.deacon@arm.com >
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27e64b4be4