Exception Handling description

[Michael Eager]

Ian Lance Taylor wrote:
> Michael Eager <eager@eagercon.com> writes:
> 
>> Is there any documentation on the contents of .eh_frame
>> and the augmentations used?  IIRC, the data describes the
>> try blocks and the catch handlers, but I'm looking for
>> the gory details.
> 
> I don't know of any docs.  Docs would be nice.
> 
> Here is the comment from gcc/dwarf2out.c:
> 
>       /* Augmentation:
> 	 z	Indicates that a uleb128 is present to size the
> 		augmentation section.
> 	 L	Indicates the encoding (and thus presence) of
> 		an LSDA pointer in the FDE augmentation.
> 	 R	Indicates a non-default pointer encoding for
> 		FDE code pointers.
> 	 P	Indicates the presence of an encoding + language
> 		personality routine in the CIE augmentation.  */
> 
> gcc before 3.0 used a different scheme, which you can probably ignore.
> In that scheme the augmentations were exactly the three bytes "eh\0".

Thanks.

I've been asked to write a description for the PowerPC ABI.
I'll reverse-engineer the table unless I can find something
more descriptive than the comments in gcc or gdb.


-- 
Michael Eager	 eager@eagercon.com
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