Roland McGrath bae3f7c39d
x86: user_regset helpers ...
This adds some inlines to linux/regset.h intended for arch code to use in
its user_regset get and set functions. These make it pretty easy to deal
with the interface's optional kernel-space or user-space pointers and its
generalized access to a part of the register data at a time.
In simple cases where the internal data structure matches the exported
layout (core dump format), a get function can be nothing but a call to
user_regset_copyout, and a set function a call to user_regset_copyin.
In other cases the exported layout is usually made up of a few pieces each
stored contiguously in a different internal data structure. These helpers
make it straightforward to write a get or set function by processing each
contiguous chunk of the data in order. The start_pos and end_pos arguments
are always constants, so these inlines collapse to a small amount of code.
Signed-off-by: Roland McGrath <roland@redhat.com >
Signed-off-by: Ingo Molnar <mingo@elte.hu >
Signed-off-by: Thomas Gleixner <tglx@linutronix.de >
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