On Wed, Aug 26, 2009 at 5:03 AM, Jan
Kratochvil<jan.kratochvil@redhat.com> wrote:

>> +      && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0)
>> +    /* This is an overlay section.  IN_MEMORY check is needed to avoid
>> +       discarding sections from the "system supplied DSO" (aka vdso)
>> +       on Linux.  */
>
> Interesting it exists, do you have a sample + kernel version of such VDSO?

This showed up on F11/i686.

$ uname -a
Linux fc11i 2.6.29.6-217.2.3.fc11.i686.PAE #1 SMP Wed Jul 29 16:05:22
EDT 2009 i686 i686 i386 GNU/Linux

When I extract vdso.so via attached dump-vdso.c (Fedora disallows
reading of /proc/self/mem), I see this:

[paul@fc11i tmp]$ readelf -l ./vdso32.so

Elf file type is DYN (Shared object file)
Entry point 0xffffe414
There are 4 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x000000 0xffffe000 0x00000000 0x00428 0x00428 R E 0x1000
  DYNAMIC        0x000350 0xffffe350 0x00000350 0x00078 0x00078 R   0x4
  NOTE           0x0001c4 0xffffe1c4 0x000001c4 0x00060 0x00060 R   0x4
  GNU_EH_FRAME   0x000224 0xffffe224 0x00000224 0x00024 0x00024 R   0x4


>> +  map_size = filter_debuginfo_sections(map, alloc_size);
>> +  map_size = filter_overlapping_sections(map, map_size);
>
> GNU spacing.

Oops. Fix attached.

Thanks,
-- 
Paul Pluzhnikov

2009-08-26  Paul Pluzhnikov  <ppluzhnikov@google.com>

       * objfiles.c (qsort_cmp): Remove asserts.
       (insert_section_p, filter_debuginfo_sections): New function.
       (filter_overlapping_sections): Likewise.
       (update_section_map): Adjust.