Am 16.10.2010 um 13:43 schrieb Andreas Färber:
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.
Update: I've been successful with the combination of -lgcc link and rtas-tokens.c compilation with -O2 -fpie (-O2 solved the _savegpr_31 issue). The _GLOBAL_OFFSET_TABLE_ issue remains though, I've been extending the rtas-ldscript without success so far.
Andreas