GELI BIOS weirdness

[Conrad Meyer]

"objdump -D -b binary -Mx86-64 -mi386 foo.bin" should work fine (no
symbols, though...).

Best,
Conrad

On Mon, Feb 13, 2017 at 1:16 PM, Dimitry Andric <dim at freebsd.org> wrote:
> On 13 Feb 2017, at 21:58, Eric McCorkle <eric at metricspace.net> wrote:
>>
>> On 02/13/2017 15:36, Dimitry Andric wrote:
>>
>>> This disassembles to:
>>>
>>>   0:   66 0f 38 f6 f0          adcx   %eax,%esi
>>>   5:   31 c6                   xor    %eax,%esi
>>>   7:   8b 4d 14                mov    0x14(%ebp),%ecx
>>>   a:   89 cf                   mov    %ecx,%edi
>>>   c:   c1 ff 1f                sar    $0x1f,%edi
>>>   f:   8b                      .byte 0x8b
>>
>> Note that this was truncated, so the sar and .byte are probably a
>> truncated instruction.
>>
>> Also, when I had printfs in place, I could see the call instructions.
>>
>>> My first guess would be that the code simply jumped into garbage.  But
>>> can you post the complete .o file somewhere for inspection?
>>
>> Attached.
>> <gptboot>
>
> Can you please post the file before it's been stripped and objcopied
> from ELF to binary format?  That makes it a lot easier to disassemble
> and analyze... :)
>
> -Dimitry
>