UDF

Permanently undefined

This instruction generates an Undefined Instruction exception (ESR_ELx.EC = 0b000000). The encodings for UDF used in this section are defined as permanently UNDEFINED.

Encoding: Integer

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
																imm16

UDF #<imm>

Decoding algorithm

// The imm16 field is ignored by hardware.
EndOfDecode(Decode_UNDEF);

Operation

// No operation.

Explanations

<imm>: is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm16" field. The PE ignores the value of this constant.