Re: Can objdump show friendly symbolic function name?

[John Reiser <jreiser at bitwagon dot com>]

>>>  Can the GOT pointer switch between GOTs within a single function?

>> A function which references more than  ((1<<16) / sizeof(void *))
>> external symbols must use more than one GOT.

>  That's a corner case that I wouldn't be surprised if it wasn't handled at 
> all -- ...    switching GOTs in the middle of a function is complicated -- ... 
> alternatively the current GOT pointer can be used to offset against.
> Either way rather painful.  Then you need to track
> backward branches to switch back as appropriate, etc., etc.

One way to handle the overflow is to put a vector of pointers to every GOT_i
at some fixed offset in each GOT:

   GOT0: .addr GOT0, GOT1, GOT2, GOT3
	...
   GOT1: .addr GOT0, GOT1, GOT2, GOT3
	...
   GOT2: .addr GOT0, GOT1, GOT2, GOT3
	...
   GOT3: .addr GOT0, GOT1, GOT2, GOT3
	...
Then you don't need to _switch_, you just suffer an indirection
(another load with delay slot) for outlanders.  For a FETCH to GPR
the indirection can use the same register as the destination,
else use $AT as for a STORE.  Yes, the compiler must be told
to generate such code.

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