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binutils-gdb/opcodes
H. Peter Anvin (Intel) 69746a4f73 x86: add "udb" opcode (permanent official #UD in 64-bit mode)
The opcode D6 has been officially reserved as a single-byte permanent
undefined (#UD) opcode in 64-bit mode with the mnemonic UDB.  This is
already the behavior of all known 64-bit implementations; this is thus
merely an official statement of forward compatibility and the
assignment of a mnemonic.

This will be documented in the next version of the Intel Software
Developer's Manual; in the meantime I DO speak officially for Intel on
this issue.

The x86 Advisory Council has ratified this decision, and so it is
expected to be honored across vendors, but I obviously cannot make any
official statement on any other vendor's behalf.

I am covered by the Intel-FSF copyright assignment for binutils.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2025-08-29 12:11:45 +02:00
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