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arch/tile: update some comments to clarify register usage.

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Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
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Chris Metcalf
2010-10-14 14:42:58 -04:00
parent 5592840ba8
commit d6f0f22c3c
2 changed files with 6 additions and 3 deletions
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arch/tile/kernel/intvec_32.S
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@ -1553,6 +1553,8 @@ STD_ENTRY(_sys_clone)
* to be available to it on entry. It does not modify any callee-save
* registers (including "lr"). It does not check what PL it is being
* called at, so you'd better not call it other than at PL0.
* The <atomic.h> wrapper assumes it only clobbers r20-r29, so if
* it ever is necessary to use more registers, be aware.
*
* It does not use the stack, but since it might be re-interrupted by
* a page fault which would assume the stack was valid, it does