http://sourceware.org/bugzilla/show_bug.cgi?id=13686
Bug #: 13686
Summary: "objdump -d" does not recognise alternative encodings
of lfence/mfence/sfence
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
AssignedTo: unassig...@sourceware.org
ReportedBy: m...@mythic-beasts.com
Classification: Unclassified
The canonical encoding of "sfence" is "0f ae f8", but the AMD manual says there
are 8 possible encodings of it, allowing any value in the 3-bit ModRM r/m field
(from "Table A-7. Opcode 0F 01 and 0F AE ModRM Extensions"):
0f ae f8
0f ae f9
0f ae fa
0f ae fb
0f ae fc
0f ae fd
0f ae fe
0f ae ff
objdump only recognises the canonical encoding:
0: 0f ae f8 sfence
3: 0f ae (bad)
5: f9 stc
6: 0f ae (bad)
8: fa cli
9: 0f ae (bad)
b: fb sti
c: 0f ae (bad)
e: fc cld
f: 0f ae (bad)
11: fd std
12: 0f ae (bad)
14: fe 0f decb (%edi)
16: ae scas %es:(%edi),%al
17: ff .byte 0xff
The same applies for lfence and mfence.
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