Class ISA

java.lang.Object
  ISA

public class ISA
extends java.lang.Object

Class containing the Larc ISA.

Field Summary

static int	ADD The opcode of an add defined by the ISA.
static int	AND The opcode of the extended bitwise AND defined by the assembly interface.
static int	B The opcode of the extended unconditional branch defined by the assembly interface.
static int	BEQ The opcode of the extended branch equal to defined by the assembly interface.
static int	BEQZ The opcode of the branch equal to defined by the ISA.
static int	BGE The opcode of the extended branch greater than or equal to defined by the assembly interface.
static int	BGEZ The opcode of the extended branch greater than or equal to zero defined by the assembly interface.
static int	BGT The opcode of the extended branch greater than defined by the assembly interface.
static int	BGTZ The opcode of the extended branch greater than zero defined by the assembly interface.
static int	BLE The opcode of the extended branch less than or equal to defined by the assembly interface.
static int	BLEZ The opcode of the extended branch less than or equal to zero defined by the assembly interface.
static int	BLT The opcode of the extended branch less than defined by the assembly interface.
static int	BLTZ The opcode of the extended branch not equal to defined by the ISA.
static int	BNE The opcode of the extended branch not equal to defined by the assembly interface.
static int	BNEZ The opcode of the branch not equal to zero defined by the ISA.
static int	DIV The opcode of the divide defined by the ISA.
static int	JAL The opcode of the extended jump and link defined by the assembly interface.
static int	JALR The opcode of the jump and link register defined by the ISA.
static int	JR The opcode of the extended jump defined by the assembly interface.
static int	LA The opcode of the extended load address defined by the assembly interface.
static int	LI The opcode of the load immediate defined by the ISA.
static int	LUI The opcode of the load upper immediate defined by the ISA.
static int	LW The opcode of the memory load defined by the ISA.
static int	MEM_SIZE Size of memory, which is 2^width
static int	MOVE The opcode of the extended branch not equal to zero defined by the assembly interface.
static int	MUL The opcode of the multiply defined by the ISA.
static int	NEG The opcode of the extended negation defined by the assembly interface.
static int	NOR The opcode of the bitwise NOR defined by the ISA.
static int	NOT The opcode of the extended bitwise NOT defined by the assembly interface.
static int	NUM_REGS Number of total registers
static int	OR The opcode of the extended bitwise OR defined by the assembly interface.
static java.lang.String	REG_A0 Argument register 0 (not preserved across subroutine calls)
static java.lang.String	REG_A1 Argument register 1 (not preserved across subroutine calls)
static java.lang.String	REG_AT0 Assembler temporary 0 register
static java.lang.String	REG_AT1 Assembler temporary 1 register
static java.lang.String	REG_K0 Kernel register 0
static java.lang.String	REG_K1 Kernel register 1
static int	REG_MAX_UNSIGNED_VALUE Maximum unsigned value that can be stored in a register
static int	REG_MAX_VALUE Maximum value (signed) that can be stored in a register
static int	REG_MIN_VALUE Minimum value (signed) that can be stored in a register
static java.lang.String	REG_RA Return address register
static java.lang.String	REG_S0 Caller-saved register 0 (preserved across subroutine calls)
static java.lang.String	REG_S1 Caller-saved register 1 (preserved across subroutine calls)
static java.lang.String	REG_S2 Caller-saved register 2 (preserved across subroutine calls)
static java.lang.String	REG_SP Stack pointer register
static java.lang.String	REG_T0 Callee-saved register 0 (not preserved across subroutine calls)
static java.lang.String	REG_T1 Callee-saved register 1 (not preserved across subroutine calls)
static java.lang.String	REG_T2 Callee-saved register 2 (not preserved across subroutine calls)
static java.lang.String	REG_V0 Result register
static java.lang.String	REG_ZERO Zero register
static int	REM The opcode of the extended remainder defined by the assembly interface.
static int	SEQ The opcode of the extended xor defined by the assembly interface.
static int	SGE The opcode of the extended xor defined by the assembly interface.
static int	SGT The opcode of the extended xor defined by the assembly interface.
static int	SLE The opcode of the extended xor defined by the assembly interface.
static int	SLL The opcode of the shift left logical defined by the ISA.
static int	SLT The opcode of the set on less than defined by the ISA.
static int	SNE The opcode of the extended xor defined by the assembly interface.
static int	SRL The opcode of the shift right logical defined by the ISA.
static int	SUB The opcode of a subtract defined by the ISA.
static int	SW The opcode of the memory store defined by the ISA.
static int	SYSCALL The opcode of the system call defined by the ISA.
static int	SYSRETN The opcode the system return instruction (only used by OS).
static int	WIDTH Processor width (number of bits stored in a single register/memory word, also addressability)
static int	XOR The opcode of the extended xor defined by the assembly interface.

Constructor Summary

ISA()

Method Summary

static int	getReg(java.lang.String reg) Converts a string representation of a register into an integer representation.
static java.lang.String	getRegName(int reg) Converts a register number into the register name.
static boolean	isKernelReg(java.lang.String reg) Is a kernel register (k0 or k1)?
static boolean	isReservedReg(java.lang.String reg) Is a reserved assembler register (at0 or at1)?

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

WIDTH

public static final int WIDTH

Processor width (number of bits stored in a single register/memory word, also addressability)

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Constant Field Values

NUM_REGS

public static final int NUM_REGS

Number of total registers

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Constant Field Values

REG_MIN_VALUE

public static final int REG_MIN_VALUE

Minimum value (signed) that can be stored in a register

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Constant Field Values

REG_MAX_VALUE

public static final int REG_MAX_VALUE

Maximum value (signed) that can be stored in a register

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Constant Field Values

REG_MAX_UNSIGNED_VALUE

public static final int REG_MAX_UNSIGNED_VALUE

Maximum unsigned value that can be stored in a register

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Constant Field Values

MEM_SIZE

public static final int MEM_SIZE

Size of memory, which is 2^width

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Constant Field Values

ADD

public static final int ADD

The opcode of an add defined by the ISA.

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Constant Field Values

SUB

public static final int SUB

The opcode of a subtract defined by the ISA.

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Constant Field Values

MUL

public static final int MUL

The opcode of the multiply defined by the ISA.

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Constant Field Values

DIV

public static final int DIV

The opcode of the divide defined by the ISA.

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Constant Field Values

SLL

public static final int SLL

The opcode of the shift left logical defined by the ISA.

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Constant Field Values

SRL

public static final int SRL

The opcode of the shift right logical defined by the ISA.

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Constant Field Values

NOR

public static final int NOR

The opcode of the bitwise NOR defined by the ISA.

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Constant Field Values

SLT

public static final int SLT

The opcode of the set on less than defined by the ISA.

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Constant Field Values

LI

public static final int LI

The opcode of the load immediate defined by the ISA.

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Constant Field Values

LUI

public static final int LUI

The opcode of the load upper immediate defined by the ISA.

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Constant Field Values

BEQZ

public static final int BEQZ

The opcode of the branch equal to defined by the ISA.

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Constant Field Values

BNEZ

public static final int BNEZ

The opcode of the branch not equal to zero defined by the ISA.

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Constant Field Values

LW

public static final int LW

The opcode of the memory load defined by the ISA.

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Constant Field Values

SW

public static final int SW

The opcode of the memory store defined by the ISA.

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Constant Field Values

JALR

public static final int JALR

The opcode of the jump and link register defined by the ISA.

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Constant Field Values

SYSCALL

public static final int SYSCALL

The opcode of the system call defined by the ISA.

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Constant Field Values

SYSRETN

public static final int SYSRETN

The opcode the system return instruction (only used by OS).

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Constant Field Values

LA

public static final int LA

The opcode of the extended load address defined by the assembly interface.

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Constant Field Values

MOVE

public static final int MOVE

The opcode of the extended branch not equal to zero defined by the assembly interface.

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Constant Field Values

NEG

public static final int NEG

The opcode of the extended negation defined by the assembly interface.

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Constant Field Values

REM

public static final int REM

The opcode of the extended remainder defined by the assembly interface.

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Constant Field Values

NOT

public static final int NOT

The opcode of the extended bitwise NOT defined by the assembly interface.

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Constant Field Values

OR

public static final int OR

The opcode of the extended bitwise OR defined by the assembly interface.

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Constant Field Values

AND

public static final int AND

The opcode of the extended bitwise AND defined by the assembly interface.

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Constant Field Values

XOR

public static final int XOR

The opcode of the extended xor defined by the assembly interface.

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Constant Field Values

SLE

public static final int SLE

The opcode of the extended xor defined by the assembly interface.

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Constant Field Values

SGT

public static final int SGT

The opcode of the extended xor defined by the assembly interface.

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Constant Field Values

SGE

public static final int SGE

The opcode of the extended xor defined by the assembly interface.

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Constant Field Values

SEQ

public static final int SEQ

The opcode of the extended xor defined by the assembly interface.

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Constant Field Values

SNE

public static final int SNE

The opcode of the extended xor defined by the assembly interface.

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Constant Field Values

B

public static final int B

The opcode of the extended unconditional branch defined by the assembly interface.

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Constant Field Values

BLTZ

public static final int BLTZ

The opcode of the extended branch not equal to defined by the ISA.

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Constant Field Values

BLEZ

public static final int BLEZ

The opcode of the extended branch less than or equal to zero defined by the assembly interface.

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Constant Field Values

BGTZ

public static final int BGTZ

The opcode of the extended branch greater than zero defined by the assembly interface.

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Constant Field Values

BGEZ

public static final int BGEZ

The opcode of the extended branch greater than or equal to zero defined by the assembly interface.

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Constant Field Values

BEQ

public static final int BEQ

The opcode of the extended branch equal to defined by the assembly interface.

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Constant Field Values

BNE

public static final int BNE

The opcode of the extended branch not equal to defined by the assembly interface.

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Constant Field Values

BLT

public static final int BLT

The opcode of the extended branch less than defined by the assembly interface.

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Constant Field Values

BLE

public static final int BLE

The opcode of the extended branch less than or equal to defined by the assembly interface.

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Constant Field Values

BGT

public static final int BGT

The opcode of the extended branch greater than defined by the assembly interface.

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Constant Field Values

BGE

public static final int BGE

The opcode of the extended branch greater than or equal to defined by the assembly interface.

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Constant Field Values

JR

public static final int JR

The opcode of the extended jump defined by the assembly interface.

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Constant Field Values

JAL

public static final int JAL

The opcode of the extended jump and link defined by the assembly interface.

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Constant Field Values

REG_ZERO

public static final java.lang.String REG_ZERO

Zero register

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Constant Field Values

REG_V0

public static final java.lang.String REG_V0

Result register

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Constant Field Values

REG_A0

public static final java.lang.String REG_A0

Argument register 0 (not preserved across subroutine calls)

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Constant Field Values

REG_A1

public static final java.lang.String REG_A1

Argument register 1 (not preserved across subroutine calls)

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Constant Field Values

REG_T0

public static final java.lang.String REG_T0

Callee-saved register 0 (not preserved across subroutine calls)

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Constant Field Values

REG_T1

public static final java.lang.String REG_T1

Callee-saved register 1 (not preserved across subroutine calls)

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Constant Field Values

REG_T2

public static final java.lang.String REG_T2

Callee-saved register 2 (not preserved across subroutine calls)

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Constant Field Values

REG_S0

public static final java.lang.String REG_S0

Caller-saved register 0 (preserved across subroutine calls)

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Constant Field Values

REG_S1

public static final java.lang.String REG_S1

Caller-saved register 1 (preserved across subroutine calls)

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Constant Field Values

REG_S2

public static final java.lang.String REG_S2

Caller-saved register 2 (preserved across subroutine calls)

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Constant Field Values

REG_SP

public static final java.lang.String REG_SP

Stack pointer register

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Constant Field Values

REG_RA

public static final java.lang.String REG_RA

Return address register

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Constant Field Values

REG_AT0

public static final java.lang.String REG_AT0

Assembler temporary 0 register

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Constant Field Values

REG_AT1

public static final java.lang.String REG_AT1

Assembler temporary 1 register

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Constant Field Values

REG_K0

public static final java.lang.String REG_K0

Kernel register 0

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Constant Field Values

REG_K1

public static final java.lang.String REG_K1

Kernel register 1

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Constant Field Values

Constructor Detail

ISA

public ISA()

Method Detail

getReg

public static int getReg(java.lang.String reg)

Converts a string representation of a register into an integer representation. Examples: $4 => 4, $zero => 0, $sp => 10

Parameters:

reg - the register name

Returns:

register as an int

getRegName

public static java.lang.String getRegName(int reg)

Converts a register number into the register name. Examples: $v0 => 1, $0 => 0, $sp => 10

Parameters:

reg - the register identifier

Returns:

register name

isReservedReg

public static boolean isReservedReg(java.lang.String reg)

Is a reserved assembler register (at0 or at1)?

Parameters:

reg - the register name

Returns:

boolean indicating whether it is reserved

isKernelReg

public static boolean isKernelReg(java.lang.String reg)

Is a kernel register (k0 or k1)?

Parameters:

reg - the register name

Returns:

boolean indicating whether it is a kernel register