[PARISC] Document some register usages in assembly files
Document clobbers and args in entry.S and syscall.S. entry.S: Add comment to indicate that cr27 may recycle and EDEADLOCK detection is not 100% correct. Since this is only enabled when using ENABLE_LWS_DEBUG, the user is warned by the comment. Signed-off-by: NCarlos O'Donell <carlos@parisc-linux.org> Signed-off-by: NKyle McMartin <kyle@parisc-linux.org>
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