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Undocumented CPU instruction that has an effect
In computer science, an illegal opcode, also called an unimplemented operation, unintended opcode or undocumented instruction, is an instruction to a
Illegal_opcode
Part of a machine instruction
In computing, an opcode (abbreviated from operation code) is an enumerated value that specifies the operation to be performed. Opcodes are employed in
Opcode
Computer machine code instruction
design flaw was discovered by programmers. Due to incomplete opcode decoding, two illegal opcodes, 0x9D and 0xDD, will cause the program counter on the processor
Halt and Catch Fire (computing)
Halt_and_Catch_Fire_(computing)
Part of a computer instruction
an opcode prefix is a numeric prefix code that alters the function of a following opcode. On some instruction set architectures multiple opcode prefixes
Opcode_prefix
Visual representation of all opcodes in an instruction set
An opcode table (also called an opcode matrix) is a visual representation of all opcodes in an instruction set. It is arranged such that each axis of
Opcode_table
Model that describes the programmable interface of a computer processor
instructions. On the processing architecture, a given instruction may specify: opcode (the instruction to be performed) e.g. add, copy, test any explicit operands:
Instruction_set_architecture
Fault initiated by x86 processors due to an access violation
classify some exceptions not related to access violations, such as illegal opcode exceptions, as general protection faults, even though they have nothing
General_protection_fault
System routines for Classic Mac OS
Macintosh operating system executes system calls using that processor's illegal opcode exception handling mechanism. Motorola specified that instructions beginning
Macintosh_Toolbox
Machine instruction that indicates to a computer to do nothing
effects; for example, on the Motorola 68000 series of processors, the NOP opcode causes a synchronization of the pipeline. Listed below are the NOP instruction
NOP_(code)
Microcode in x86 Intel processors
TOS to zero and restart the operation. … Illegal opcodes that are instruction holes in the MMX instruction opcode map are defined to generate a one uop assist
Intel_microcode
List of x86 microprocessor instructions
4-687. Stecklina, Julian (2019-02-08). "Fingerprinting x86 CPUs using Illegal Opcodes". x86.lol. Archived from the original on 15 Dec 2023. Retrieved 2023-12-15
List_of_x86_instructions
8-bit microprocessor
are several other undocumented instructions as well. Undocumented or illegal opcodes are not detected by the Z80 and have various effects, some of which
Zilog_Z80
Aspect of the instruction set architecture of CPUs
particular operand. Keeping the addressing mode specifier bits separate from the opcode operation bits produces an orthogonal instruction set. Even on a computer
Addressing_mode
Form of digital logic family in integrated circuits
unusual glitches or buggy behavior in NMOS components, such as the 6502 "illegal opcodes" which are absent in CMOS 6502s. In some cases such as Commodore's
NMOS_logic
Signal to a computer processor emitted by hardware or software
exceptional condition (e.g., division by zero, invalid memory access, illegal opcode), although the term exception is more common for this. x86 divides interrupts
Interrupt
Topics referred to by the same term
pregnancy Organ theft Illegal opcode General protection fault Illegal taxi operation Criminal organization Criminal conspiracy The Illegal Operation (sculpture)
Illegal_operation
Engineering flaw in a manufactured device
It's A Feature". For example, undocumented instructions, known as illegal opcodes, on the MOS Technology 6510 of the Commodore 64 and MOS Technology
Hardware_bug
Type of programmable logic device
programmable logic arrays. Texas Instruments. Bulletin CA-158. How MOS 6502 Illegal Opcodes really work arcadecomponents.com - Commodore 906114-01 64 PLA IC "Programmable
Programmable_logic_array
Type of computer instructions
sign-extension and points out the potential is much greater. Intel BCD opcodes Power ISA has a large range of bit manipulation instructions, largely due
Bit_manipulation_instructions
Instruction in computer program
Machine code General concepts Instruction set Opcode Illegal opcode Opcode table Opcode prefix Operand Addressing mode Instructions NOP Branch Indirect
Branch_(computer_science)
8-bit microprocessor
unlicensed clone of the Zilog Z80 microprocessor, also supporting illegal opcodes and bugs, except for very minor differences like not setting the CY
U880
Hardware extension for ARM processors
software (with optimised ARM/ThumbEE JVM code), or treated as an invalid/illegal opcode. The third case will cause a branch to an ARM exception mode, as will
Jazelle
Machine instruction executing another instruction repeatedly
repeat instructions (REP(∅/E/Z/NE/NZ)) which are called "repeat string opcode prefixes" and may only be applied to a small number of string instructions
Repeat_instruction
Type of program control instruction
Machine code General concepts Instruction set Opcode Illegal opcode Opcode table Opcode prefix Operand Addressing mode Instructions NOP Branch Indirect
Indirect_branch
64-bit x86 register
RAX and RDX. Its opcode is 0F 31. Pentium competitors such as the Cyrix 6x86 did not always have a TSC and may consider RDTSC an illegal instruction. Cyrix
Time_Stamp_Counter
Early microprocessor
July 2016. Landsteiner, Norbert (2021-06-05). "Now Go Bang! 6502 "Illegal" Opcodes Demystified". Now Go Bang!. Retrieved 2024-02-02. "6502 Instruction
RCA_1802
Third model in the Apple II series of personal computers
those that did not follow Apple programming guidelines and rules, used illegal opcodes that were no longer available in the new CMOS-based CPU, or used the
Apple_IIe
Design flaw in 1993-1997 Intel processors
compare and exchange of 8 bytes in register EAX). The bug also applies to opcodes ending in C9 through CF, which specify register operands other than EAX
Pentium_F00F_bug
Computer instruction executing another instruction
Machine code General concepts Instruction set Opcode Illegal opcode Opcode table Opcode prefix Operand Addressing mode Instructions NOP Branch Indirect
Execute_instruction
programming is also possible on the (original) HP-15C. Casio FX-602P series Illegal opcode Logic synthesis NOMAS (support) Overlapping instructions Self-modifying
Synthetic_programming_(HP-41)
Aspect of computer hardware or software
(INABIAF) and its variations. Undocumented instructions, known as illegal opcodes, on the MOS Technology 6502 and its variants are sometimes used by
Undocumented_feature
Fourth model Apple II computer model
instructions to the 6502, but is incompatible with programs that use illegal opcodes of the 6502. (Apple stated that the Apple IIc was compatible with 90–95%
Apple_IIc
Software development system
on the model, the control board might also contain hardware to flag illegal opcodes or memory accesses or to act as an internal logic analyzer. Memory
HP_64000
Modification of software, often to use it for free
or monitor in a manner that replaces a prior branching opcode with its complement or a NOP opcode so the key branch will either always execute a specific
Software_cracking
Bug in the Intel P5 Pentium floating-point unit
patch the machine code of existing executables to replace the FDIV opcode with an illegal instruction. This would then trigger an exception that an exception
Pentium_FDIV_bug
Unexpected program exit due to an error
an earlier bug, executing invalid machine instructions (an illegal or unauthorized opcode), or triggering an unhandled exception. The original software
Crash_(computing)
List of computer processor instructions
the memory operand, and 9-bit branch destinations. Later revisions added opcode bits, allowing additional address bits. They are accumulator machines, with
PIC_instruction_listings
16-bit microprocessor
Z280". TCJ. Retrieved 2009-07-15. Harston, J.G. (1998-04-15). "Full Z280 Opcode List". Archived from the original on 2008-09-05. Retrieved 2009-07-15. Z280
Zilog_Z280
Technique circumventing programming language data typing
b have the same type, and therefore the same size. ret } The cpblk CIL opcode allows for some other tricks, such as converting a struct to a byte array:
Type_punning
Instruction set architecture developed by Digital Equipment Corporation
on the stack. The caller then adds the number of arguments to the MARK opcode and pushes that result on the stack. The value of SP is copied to R5. Finally
PDP-11_architecture
Microprocessor produced by Western Digital
ever produced. When a standard WD16 processor executes opcodes F500 to FFFF, the reserved opcode trap is taken, loading PC from 001A. The high-order ten
WD16
Microprocessor
68000 such as the Hitachi FD1089 and FD1094 store decryption keys for opcodes and opcode data in battery-backed memory. These were used in certain Sega arcade
Motorola_68000
Hitachi variant of the Motorola 6809 8-bit microprocessor
especially in tight loops.[citation needed] Most of new instructions use opcode prefixes that makes them slower by one cycle when compared to similar 6809
Hitachi_6309
Open-source CPU instruction set architecture
compensate, RISC-V's 32-bit instructions are actually 30 bits; 3⁄4 of the opcode space is reserved for an optional (but recommended) variable-length compressed
RISC-V
Mainframe computer
processor mode (master, slave, absolute) Interrupt recognition/handling Opcode decoding Operations Unit: Performs fractional and integer divisions and
GE_645
Computer instruction for returning hardware-generated random numbers
the EBX register is set after calling CPUID standard function 07H. The opcode for RDRAND is 0x0F 0xC7, followed by a ModRM byte that specifies the destination
RDRAND
Games console
later: Enhanced CPU (fast/burst mode, additional registers and opcodes, support for illegal ops of the 6510) The official games for the unit are mostly a
C64_Direct-to-TV
Fatal system error screen
03: Shutdown Error 04: Overflow Trap 05: Bounds Check Fault 06: Invalid Opcode Fault 07: "Coprocessor Not Available" Fault 08: Double Fault 09: Coprocessor
Blue_screen_of_death
Decimal computer introduced by IBM in 1958
significant digit. Instructions on the 7070 typically have a signed two-digit opcode, a two-digit index field, a two-digit control field and a four-digit address
IBM_7070
differences in ColdFire and 68K instruction set and opcodes: FireTOS includes 68K emulation based on an illegal instruction exception handler and CF68KLib 68Kemu
Atari_Coldfire_Project
Operating system of the Atari ST range of computers
boot sectors for the Atari platform typically start with an MC68K jump opcode (e.g. 0x603C, and the last two byte word must sum with the rest of the boot
Atari_TOS
Intermediate representation defined within the CLI specification
Console::WriteLine(string) ret } The following code is more complex in number of opcodes. This code can also be compared with the corresponding code in the article
Common_Intermediate_Language
Object which stores memory addresses in a computer program
address and whether or not there is (coincidentally) a valid instruction (opcode) at that address. The detection of a wild branch can present one of the
Pointer (computer programming)
Pointer_(computer_programming)
Microprocessor security vulnerability
alignment, division by zero, supervisor modes, segment limits, invalid opcodes, and non-executable code. Meltdown relies on a CPU race condition that
Meltdown (security vulnerability)
Meltdown_(security_vulnerability)
Software that controls computer-graphics hardware
the hardware directly. Because all translation (from API calls to GPU opcodes) is done by the device driver, it contains specialized knowledge and is
Free and open-source graphics device driver
Free_and_open-source_graphics_device_driver
Macro instruction for the DOS/360 operating system
introduction of invalid opcodes (on the fly) to locations in the target programs. Once the exit recovery was entered, the original opcode would be restored
STXIT
16-bit microprocessor family
instruction. To do this, only the upper five bits were available for the opcode, allowing a total of 32 possible direct instructions, while the remaining
Ferranti_F100-L
32-bit RISC CPU architecture
Non-BR. 1st map opcodes NOP is an alias of MOV R0,R0. 2nd map opcodes 1st map opcodes † NOP is an alias of MOV R0,R0. 2nd map opcodes In 1998, NEC started
V850
Operating system
editable) and fast machine code monitor which supports illegal 6502 and SuperCPU emulation mode opcodes. Commands: @ – Disk command, status and directory A
IDEDOS
ILLEGAL OPCODE
ILLEGAL OPCODE
Boy/Male
Latin American French Teutonic
Iegal.
Boy/Male
Muslim
Cheerful, Legal expert, One who recites the Quran
Boy/Male
Indian
Cheerful, Legal expert, One who recites the Quran
Surname or Lastname
English
English : occupational name for a watchman or guard, from Old English weard ‘guard’ (used as both an agent noun and an abstract noun).Irish : reduced form of McWard, an Anglicized form of Gaelic Mac an Bhaird ‘son of the poet’. The surname occurs throughout Ireland, where three different branches of the family are known as professional poets.Surname adopted by bearers of the Jewish surname Warshawski, Warshawsky or some other Jewish name bearing some similarity to the English name.Americanized form of French Guerin.The surname Ward was brought to North America from England independently by several different bearers in the 17th and 18th centuries. Nathaniel Ward (1578–1652), author of the MA legal code, was born in Haverhill, Suffolk, England, and emigrated to Agawam (Ipswich, MA) in 1633. William Ward was one of the original settlers of Sudbury, MA, in about 1638. Miles Ward came from England to Salem, MA, in about 1639. Thomas Ward (d. 1689) settled in Newport, RI, in 1671; among his descendants were two governors of colonial RI.
Surname or Lastname
English and French
English and French : in medieval times this did not denote a rank in the army, but was an occupational name for a servant, Middle English, Old French sergent (Latin serviens, genitive servientis, present participle of servire ‘to serve’). The surname probably originated for the most part in this sense, but the word also developed various more specialized meanings, being used for example as a technical term for a tenant by military service below the rank of a knight, and as the name for any of certain administrative and legal officials in different localities, which may also have contributed to the development of the surname. The sense ‘non-commissioned officer’ did not arise until the 16th century.William Sargent (1624–1717) came to Gloucester, MA, from Devon, England before 1678. Many of his descendants distinguished themselves in the civil and military affairs of the colonies and some in literary or artistic paths, notably the portrait painter John Singer Sargent (1856–1925).
Surname or Lastname
Turkish
Turkish : occupational name from asker ‘soldier’, from Arabic ‛askarī. This name is also found in Iran and the Indian subcontinent.Arabic : variant of Asghar.Greek : shortened form of Askeris, from Turkish asker ‘soldier’, or from Askeridis or Askeropoulos, patronymics from this word. Compare Laskaris.Norwegian and Swedish : habitational name from any of several farmsteads named Asker, in particular those near Oslo, from an inflected form of ask ‘ash tree’.English (Norfolk) : topographic name for someone who lived by an ash tree, Middle English ask (from Old Norse asker) + the habitational suffix -er.English : from Middle English asker(e) ‘collector of tolls or revenues’ or (in a legal context) ‘plaintiff’ or ‘prosecutor’ (an agent derivative of Middle English aske(n) ‘to ask’, ‘to demand’).
Boy/Male
Indian
Cheerful, Legal expert, One who recites the Quran
Surname or Lastname
English
English : unexplained; possibly from the legal term bailor ‘one who delivers goods’.
Girl/Female
Arabic, Muslim
A Must have; Right; Courage; Power; Legal; Allowable
Surname or Lastname
English
English : occupational name from an agent derivative of Middle English tingle (see Tingle).German : occupational or status name for a medieval judge or court official, from Old High German ding ‘legal proceeding’.German : variant of Tengler.
Boy/Male
Arabic, Muslim
Legal; Lawful
Surname or Lastname
South German
South German : occupational name for an official in charge of the legal auction of property confiscated in default of a fine; such a sale was known in Middle High German as a gant (from Italian incanto, a derivative of Late Latin inquantare ‘to auction’, from the phrase In quantum? ‘To how much (is the price raised)?’).German : metonymic occupational name for a cooper, from Middle High German ganter, kanter ‘barrel rack’.German : variant of Gander 3.English : occupational name for a glover, from Old French gantier, an agent derivative of gant ‘glove’ (see Gant).
Boy/Male
Muslim
Cheerful, Legal expert, One who recites the Quran
Surname or Lastname
German
German : from a short form (Sabbe) of a Germanic personal name with sacha ‘legal case or action’ as the first element.English : topographic name from Middle English sap ‘spruce tree’ (Old English sæppe).
Surname or Lastname
English
English : topographic name for someone living in a small wooded dell or hollow, Middle English dingle (of uncertain origin). There is a district of Liverpool called Dingle.South German : nickname or status name for a smallholder, from Middle High German dingelīn ‘smallholding’.Americanized spelling of the old Prussian name Dingel or Dyngele, possibly from Germanic thing ‘legal assembly’.
Boy/Male
Latin
Iegal.
ILLEGAL OPCODE
ILLEGAL OPCODE
Girl/Female
Muslim/Islamic
Guardian Protector
Biblical
thunder, or evil, from the Lord
Girl/Female
Tamil
Sacred, Having the power of Om
Boy/Male
Afghan, American, Arabic, British, Christian, Danish, Dutch, English, French, German, Hawaiian, Hebrew, Hindu, Indian, Netherlands, Polish, Portuguese, Shakespearean, Swedish
Faultless; Father of a Multitude and Many Nations
Girl/Female
Australian, Chinese, Irish
Magnolia Blossom; Wood Orchid
Boy/Male
Arabic, Muslim
Mysteries; Secret
Boy/Male
Australian, Biblical, Christian, Hebrew
Grace; Mercy; Gift of the Lord; Compassion of God
Girl/Female
English American Japanese
Abbreviation of Thomasina and Tamara.
Girl/Female
Arabic
Bud; New
Female
Greek
(Îατάσσα) Variant spelling of Greek Natása, NATASSA means "resurrection."
ILLEGAL OPCODE
ILLEGAL OPCODE
ILLEGAL OPCODE
ILLEGAL OPCODE
ILLEGAL OPCODE
a.
Not warrantable; indefensible; not vindicable; not justifiable; illegal; unjust; improper.
a.
Created by, permitted by, in conformity with, or relating to, law; as, a legal obligation; a legal standard or test; a legal procedure; a legal claim; a legal trade; anything is legal which the laws do not forbid.
a.
Contrary to, or unauthorized by, law; illegal; as, a lawless claim.
a.
Lawyerlike; legal.
n.
Counseling to perform a specific illegal act.
a.
According to the law of works, as distinguished from free grace; or resting on works for salvation.
n.
The quality or condition of being illegal; unlawfulness; as, the illegality of trespass or of false imprisonment; also, an illegal act.
v. t.
Too put to death illegally; to kill.
a.
Governed by the rules of law as distinguished from the rules of equity; as, legal estate; legal assets.
n.
One who traffics illegally; a smuggler.
a.
Not right; illegal; as, wrongous imprisonment.
adv.
In a illegal manner; unlawfully.
n.
The doing of an act which a person ought not to do; evil conduct; an illegal deed.
a.
Practicing usury; taking illegal or exorbitant interest for the use of money; as, a usurious person.
n.
Illegal or prohibited traffic.
v. t.
To make legal.
a.
Proceeding from adulterous intercourse. Hence: Spurious; without the support of law; illegal.
a.
According to the old or Mosaic dispensation; in accordance with the law of Moses.
v. t.
To make or declare illegal or unlawful.
a.
Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral; as, an illegal act; illegal trade; illegal love.