> Hello,
> 
> This patch implements a 4-bit PPC ELF specific push_dummy_call method. It then adds a work-around (*_broken_push_dummy_call) for what would appear to be GCC bugs.  This fixes ~200 failures (give or take the 3 fixed by the workaround).

I've attached a simplified revision.

Since the two potential places (left/right register ends) for storing 
struct parameters didn't overlap, modified the code so that it stored 
the value at both ends ...

> Ok to commit?
> 
> Andrew
> 
> PS: The apparent bugs are:
> 
> - small odd structs get passed in memory instead of a register (ref structs.exp:Fun3).
> - small even structs get passed right, instead of left, aligned in the register (ref structs.exp:Fun[12]).
> 
> PS: Backtraces are a bit sick.
> 
> PPS: Oh, note the "hack" to find the TOC from the function's entry point address.  Without it malloc() fails.
> 
>