Messages in this thread | | | Date | 18 Mar 2007 18:04:14 +0100 | Date | Sun, 18 Mar 2007 18:04:14 +0100 | From | Andi Kleen <> | Subject | Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable |
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> The bigger problem is that you don't know what registers you can > clobber. For the pv_ops in hand-written asm, that a big pain. The code > either has to assume the worst, or the "relocator" has to do something > more sophisticated (like look for push/pop pairs surrounding the call, > perhaps?).
You could use the dwarf2 unwind tables. They have exact information what register has what. But it would likely get complicated.
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