x86 Instruction Set Reference
UD2
Undefined Instruction
| Opcode | Mnemonic | Description |
|---|---|---|
0F 0B |
UD2 |
Raise invalid opcode exception. |
| Description |
|---|
|
Generates an invalid opcode. This instruction is provided for software testing to explicitly generate an invalid opcode. The opcode for this instruction is reserved for this purpose. Other than raising the invalid opcode exception, this instruction is the same as the NOP instruction. |
| Operation |
|---|
Exception(UD); //Generates invalid opcode exception |
| Flags affected |
|---|
|
None. |