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. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils