Re: PPC? (Was: Re: [RFC] /proc/ksyms change for IA64)

Keith Owens
2001-08-05T19:41:54Z

On 05 Aug 2001 11:29:00 +0200,
kaih@khms.westfalen.de (Kai Henningsen) wrote:
>kaos@ocs.com.au (Keith Owens) wrote on 02.08.01 in <22165.996722560@kao2.melbourne.sgi.com>:
>
>> The IA64 use of descriptors for function pointers has bitten ksymoops.
>> For those not familiar with IA64, &func points to a descriptor
>> containing { &code, &data_context }.
>
>That sounds suspiciously like what I remember from PPC. How is this solved
>on the PPC side?

Best guess, without access to a PPC box, is that it is not solved. Any
arch where function pointers go via a descriptor will have this
problem.

PPC users, does /proc/ksyms contain the address of the function code or
the address of a descriptor which points to the code? It is easy to
tell, if function entries in /proc/ksyms are close together (8-128
bytes apart) and do not match the addresses in System.map then PPC has
the same problem as IA64. If this is true, what is the layout of a PPC
function descriptor so I can handle that case as well?