[OpenBIOS] Q: How to "squeeze" C functions in between two symbols?

Andreas Färber andreas.faerber at web.de
Sat Oct 16 13:43:02 CEST 2010

Am 14.10.2010 um 18:45 schrieb Mark Cave-Ayland:

> Andreas Färber wrote:
>> I got OpenBIOS to load my RTAS blob and AIX to enter my RTAS C  
>> function and emit something to escc uart from there. It looks like  
>> AIX is trying to emit "\nAIX " via display-character RTAS calls.
>> My code's not very stable though, the same code snippet didn't work  
>> inside a [{static,inline}] serial_putchar() function but did  
>> directly in my main function called from assembly. Still poking at  
>> ldscript and assembler to find the cause or a workaround. Right now  
>> it does print okay but hangs on returning from the RTAS call. Will  
>> post an RFC once I've cleaned it up a little, maybe it's something  
>> obvious...
>> Andreas
> I don't know if it helps with PPC, but on SPARC64 there is an issue  
> whereby if you are compiling with -O0 (which is typical during  
> development), you need to allow extra stack space when switching  
> contexts. Does compiling with -Os solve the issue at all?

Seems like it was compiling with -Os by default.


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