[Bug binutils/2768] New: readelf and segmented addresses in DWARF2/3 aranges

[stephane dot chauveau at philips dot com]

I am using readelf to dump the DWARF2/3 information for an architecture with
segmented memories (not an arch supported by gcc, sorry!) and I believe that
readelf does not exactly follow the specifications when dumping the
.debug_aranges sections in the function display_debug_aranges(). 

The DWARF2/3 specs, defines the format of an address (segmented or not) by two
bytes in the header of a arange block.

The first byte is defined as "the size in bytes of an address (or the offset
portion of an address for segmented addressing)". 

The second byte is defined as "the size in bytes of a segment descriptor on the
target system." 

My interpretation is that the total size of an address is obtained by the sum of
both bytes. For example, a 32bit address composed of a 8bit segment and a 24bit
offset should be described by the pair (3,1).

The current implementation is assuming that the size of an address is fully
specified by the 1st byte so is likely to crash (or to produce inconsistant
results) when the second byte is non-zero.

-- 
           Summary: readelf and segmented addresses in DWARF2/3 aranges
           Product: binutils
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: stephane dot chauveau at philips dot com
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=2768

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