[RFA] bfd/elf-eh-frame.c: return address column of CIE

[Hans-Peter Nilsson]

On Fri, 23 Aug 2002, Jakub Jelinek wrote:

> On Fri, Aug 23, 2002 at 07:42:45AM +0100, Nick Clifton wrote:
> > So - for DWARF2 we read a ubyte and for DWARF3 we read a LEB128 ?
>
> Well, unless the ubyte is >= 128, it is the same.
> Unfortunately there are 3 broken ports - frv, sh (non-SH5) and mmix
> which use bigger values (well, mmix even uses 259 so it is incorrectly
> truncated anyway).

Wrong, for MMIX it's (259 - 224) = 15 mainly for this reason,
fitting the return address column into a byte.  See
mmix_dbx_register_number.  (Suggest recheck your statement about
the other targets too: I didn't check.)  That number absolutely
has to fit into a byte.  There should be a gcc #ifdef
ENABLE_CHECKING aborting test in dwarf2out.c.  Things go very
bad if it doesn't fit.  I don't remember, but it'd probably be
visible at least in gcc test results...

brgds, H-P