[openrisc] Function prologue and stack frame

[Carlos =?iso-8859-15?q?S=E1nchez=20de=20La=20Lama?= <Carlos.Sanchez@gmx.net>]

Hallo!

It seems to me that there are some inconsistences between the prologue that 
GCC introduces and what GDB expects to find at the beginning of functions. 
I've looked at source code, and or32_output_file (in GCC sources, or32.c) and 
or1k_skip_prologue (GDB sources, or1k-tdep.c) simply don't match. Moreover, 
the prologue format expected by the mentioned or1k_skip_prologue and by 
or1k_frame_chain (also from GDB sources) is not the same.

On the other hand, the stack frame format depicted on the OpenRISC 
Architecture Manual is different to the one created by the code actually 
inserted by GCC. The latter puts local variables just below FP, and previous 
FP and return address below those.

I think these could be the cause of the "found function without prologue" 
errors posted in the forum some weeks ago. I would like to know whether 
someone has reached similar conclussions (or just tell me if you think I'm 
wrong ;-) ).

	Carlos
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