On Thu, Jun 15, 2017 at 03:03:40PM +0100, Dave P Martin wrote: > In preparation for expanding the signal frame, this patch refactors > the signal frame setup code in setup_sigframe() into two separate > passes. > > The first pass, setup_sigframe_layout(), determines the size of the > signal frame and its internal layout, including the presence and > location of optional records. The resulting knowledge is used to > allocate and locate the user stack space required for the signal > frame and to determine which optional records to include. > > The second pass, setup_sigframe(), is called once the stack frame > is allocated in order to populate it with the necessary context > information. > > As a result of these changes, it becomes more natural to represent > locations in the signal frame by a base pointer and an offset, > since the absolute address of each location is not known during the > layout pass. To be more consistent with this logic, > parse_user_sigframe() is refactored to describe signal frame > locations in a similar way. > > This change has no effect on the signal ABI, but will make it > easier to expand the signal frame in future patches. > > Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx> Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
