com.cmpware.cmp.models
Class ARC700

java.lang.Object
  com.cmpware.cmp.Memory
      com.cmpware.cmp.Processor
          com.cmpware.tools.AutoModel
              com.cmpware.cmp.models.ARC700

All Implemented Interfaces:

ReadWriteInterface

Direct Known Subclasses:

ARC700EX

public class ARC700
extends AutoModel

This is an AutoModel implementation of the ARC700 processor.

Copyright (c) 2006 Cmpware, Inc. All Rights Reserved.

Author:

SAG

Nested Class Summary

static class	ARC700.BRCC
static class	ARC700.CC
static class	ARC700.OP
static class	ARC700.REG This class defines some Register indicies
static class	ARC700.SREG This class defines the Special Register indicies

Nested classes/interfaces inherited from class com.cmpware.tools.AutoModel

AutoModel.Asm, AutoModel.Decode, AutoModel.Field, AutoModel.Format, AutoModel.Function, AutoModel.Instruction, AutoModel.Symbol

Field Summary

protected static AutoModel.Field	a
protected static AutoModel.Field	a16
protected static AutoModel.Field	aa1
protected static AutoModel.Field	aa2
protected static AutoModel.Field	aa3
protected static AutoModel.Symbol[]	aaSymbols The Load write-back mode (.aa) Symbols
protected static AutoModel.Field	all32
protected static AutoModel.Format	allbits
protected static AutoModel.Field	b
protected static AutoModel.Field	b16
protected static AutoModel.Field	bhi
protected static AutoModel.Field	bit15
protected static AutoModel.Field	bit16
protected static AutoModel.Field	bit17
protected static AutoModel.Field	bit4
protected static AutoModel.Field	bit5
protected static AutoModel.Field	c
protected int	c_flag Shadow C (carry) flag
protected static AutoModel.Field	c16
protected int	cc The condition code
protected static AutoModel.Symbol[]	ccSymbols The condition code symbols
static java.lang.String	copyright Copyright string
protected int	dest The destination (typically an index into a register set)
protected static AutoModel.Field	di1
protected static AutoModel.Field	di2
protected static AutoModel.Field	di3
protected static AutoModel.Symbol[]	diSymbols The Data Cache mode (.di) Symbols
protected int	e1_flag Shadow E1 (interrupt mask) flag
protected int	e2_flag Shadow E2 (interrupt mask) flag
protected static AutoModel.Field	f
protected static AutoModel.Format	fmt_abc
protected static AutoModel.Format	fmt_abu6
protected static AutoModel.Format	fmt_bbc
protected static AutoModel.Format	fmt_bbs12
protected static AutoModel.Format	fmt_bbu6
protected static AutoModel.Format	fmt_bc
protected static AutoModel.Format	fmt_bcs9
protected static AutoModel.Format	fmt_bs12
protected static AutoModel.Format	fmt_bu6
protected static AutoModel.Format	fmt_bu6s9
protected static AutoModel.Format	fmt_c
protected static AutoModel.Format	fmt_cbs9
protected static AutoModel.Format	fmt_dbc
protected static AutoModel.Format	fmt_dbu6
protected static AutoModel.Format	fmt_jc
protected static AutoModel.Format	fmt_ju6
protected static AutoModel.Format	fmt_ldabc
protected static AutoModel.Format	fmt_ldabs9
protected static AutoModel.Format	fmt_qbc
protected static AutoModel.Format	fmt_qbu6
protected static AutoModel.Format	fmt_s12
protected static AutoModel.Format	fmt_s13
protected static AutoModel.Format	fmt_s21
protected static AutoModel.Format	fmt_s25
protected static AutoModel.Format	fmt_u6
protected static AutoModel.Format	fmt_u7
protected static AutoModel.Format	fmt16
protected static AutoModel.Format	fmt16_abc
protected static AutoModel.Format	fmt16_bbh
protected static AutoModel.Format	fmt16_bc
protected static AutoModel.Format	fmt16_bspu7
protected static AutoModel.Format	fmt16_cbu3
protected static AutoModel.Symbol[]	fSymbols The Flags update flag
protected static AutoModel.Field	h16
protected static AutoModel.Field	h16hi
protected static AutoModel.Field	ldop2
protected int	n_flag Shadow N (negative) flag
protected static AutoModel.Field	nd
protected static AutoModel.Symbol[]	ndSymbols The Delay Slot flag (.nd) Symbols
protected static AutoModel.Field	op
protected static AutoModel.Field	op16
protected static AutoModel.Field	op16_2
protected static AutoModel.Field	op2
protected static AutoModel.Field	op2b
protected static AutoModel.Field	op3
protected static AutoModel.Field	p
protected static AutoModel.Field	q
protected int	rd The relative displacement
protected static AutoModel.Symbol[]	regSymbols The General Purpose Register Symbols
protected int	s1_flag Shadow S1 (saturate) flag
protected static AutoModel.Field	s10hi
protected static AutoModel.Field	s11lo
protected static AutoModel.Field	s12
protected static AutoModel.Field	s13
protected int	s2_flag Shadow S2 (saturate) flag
protected static AutoModel.Field	s21
protected static AutoModel.Field	s25
protected static AutoModel.Field	s3_4
protected static AutoModel.Field	s5_7
protected static AutoModel.Field	s6hi
protected static AutoModel.Field	s6lo
protected static AutoModel.Field	s7
protected static AutoModel.Field	s8lo
protected static AutoModel.Field	s9_10
protected static AutoModel.Field	s9hi
protected static AutoModel.Field	sp16
protected int	src1 The first source parameter
protected int	src2 The second source parameter
static int[][]	SREG_MAP This maps the index used by the simulator to represent the special register address to the address used by hardware.
protected static AutoModel.Symbol[]	sregSymbols The Special Purpose Register Symbols
protected static AutoModel.Field	t
protected static AutoModel.Field	u3_16
protected static AutoModel.Field	u6
protected static AutoModel.Field	u7
protected static AutoModel.Field	u7_16
protected int	v_flag Shadow V (overflow) flag
protected static AutoModel.Field	x1
protected static AutoModel.Field	x2
protected static AutoModel.Symbol[]	xSymbols The Sign Extend flag (.x) Symbols
protected int	z_flag Shadow Z (Zero) flag
protected static AutoModel.Field	zz1
protected static AutoModel.Field	zz2
protected static AutoModel.Field	zz3
protected static AutoModel.Symbol[]	zzSymbols The Data Size flag (.zz) Symbols

Fields inherited from class com.cmpware.tools.AutoModel

currentInstr, currentInstrType, instructionSizes, TRACE

Fields inherited from class com.cmpware.cmp.Processor

bkpt, branchAddr, branchDelay, breakpointHit, currentBranchDelay, currentInstrCode, cycleCount, elf, idlePower, iMix, instructionSize, name, noop, opcodeName, pc, prevInstr, prevInstrCode, r, regName, runningPower, sr, sregName, stall, stallCount

Fields inherited from class com.cmpware.cmp.Memory

BIG, LITTLE

Constructor Summary

ARC700()
The constructor

Method Summary

static int	addCarry(int src1, int src2, int result) This method is used to determine if an add carry has occurred.
static int	addOverflow(int src1, int src2, int result) This method is used to determine if an add overflow has occurred.
protected static AutoModel.Decode	bbit(int _op2b) This is a helper function used in decoding the BBIT ARC700 instructions.
protected static AutoModel.Decode	blcc() This is a helper function used in decoding the BLcc ARC700 instructions.
protected static AutoModel.Decode	brcc() This is a helper function used in decoding the BRcc ARC700 instructions.
void	dasmFixup(long instrData, AutoModel.Instruction instr) This method can be overloaded to fix up any problems or to do any clean-up in the disassembler.
long	fetch(int addr, int bytes) This method returns a long (64-bit) value based on the data at 'bytes' bytes of memory at address 'addr'.
int	getPC() This method returns the current Program Counter.
protected static AutoModel.Decode	ld2() This is a helper function used in decoding the LD ARC700 instructions.
static void	main(java.lang.String[] args) This enables the stand-alone assembler and disassembler.
protected static AutoModel.Decode	op(int _op) This is a helper function used in decoding simple one opcode ARC700 instructions.
protected static AutoModel.Decode	op(int _op, int _op2) This is a helper function used in decoding simple two opcode ARC700 instructions.
protected static AutoModel.Decode	op(int _op, int _op2, int _a) This is a helper function used in decoding three opcode ARC700 instructions.
protected static AutoModel.Decode	op16(int _op) This is a helper function used in decoding ARC700 16-bit instructions with a single decode field.
protected static AutoModel.Decode	op16(int _op, int _op2) This is a helper function used in decoding ARC700 16-bit instructions with two decode fields.
protected static AutoModel.Decode	op16(int _op, int _a, int _b, int _c) This is a helper function used in decoding ARC700 16-bit instructions with four decode fields.
protected static AutoModel.Decode	op3(int _op, int _op2, int _p) This is a helper function used in decoding simple three opcode ARC700 instructions.
protected static AutoModel.Decode	op3(int _op, int _op2, int _p, int _bit5) This is a helper function used in decoding simple three opcode ARC700 instructions.
protected static AutoModel.Decode	opAll(int a) This is a helper function used in decoding the special no parameter ARC700 instructions.
void	postExecute(int instr) This method is called immediately after execution and may be overloaded to do things like save instruction field values to locals.
void	preExecute(int instr) This method is called immediately before execution and may be overloaded to do things like save instruction field values to locals.
void	reset() This method resets the processor.
void	setPC(int pc) This method sets the current Program Counter.
static int	sign(int a) This method returns the sign bit for 32 bit value.
static int	subCarry(int src1, int src2, int result) This method is used to determine if a sub carry has occurred.
static int	subOverflow(int src1, int src2, int result) This method is used to determine if a sub overflow has occurred.
static int	zero(int a) This method returns '1' if the parameter 'a' is a zero and '0' otherwise.

Methods inherited from class com.cmpware.tools.AutoModel

advancePC, asmFixup, bitsToBytes, concatenate, dasm, dasm, decode, defineInstructions, execute, fetch, getInstruction, getInstructions, getInstructionSizes, getSymbolNames, instrMatch, main, signExtend, signExtend, toHexString, toHexString, toLong, traceOff, traceOn

Methods inherited from class com.cmpware.cmp.Processor

branch, branchNoDelay, defineBranchDelay, defineBreakpoint, defineInstructionSize, defineName, defineNoop, defineOpcodeNames, defineRegisterNames, defineRegisters, defineSpecialRegisterNames, defineSpecialRegisters, get, getBreakpoint, getBreakpointData, getBreakpoints, getCycleCount, getDebugRegisters, getElf, getIdlePower, getInstructionMix, getInstructionSize, getName, getNoop, getOpcodeNames, getRegister, getRegisterNames, getRegisters, getRunningPower, getSpecialRegister, getSpecialRegisterNames, getSpecialRegisters, getStallCount, isBreakpoint, isStalled, load, postLoad, removeAllBreakpoints, removeBreakpoint, setBreakpoint, setIdlePower, setRegister, setRunningPower, setSpecialRegister, stall, statistics, step

Methods inherited from class com.cmpware.cmp.Memory

addInput, addMemory, addOutput, getEndian, getLocalMemory, getMemoryManager, getMmio, getProfile, hexDump, hexDump, isReadable, isValidAddress, isWriteable, profile, read, read, read16, read24, read32, read64, removeMemory, resize, setEndian, size, toInt, toShort, write, write, write16, write24, write32, write64

Methods inherited from class java.lang.Object

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

Field Detail

copyright

public static final java.lang.String copyright

Copyright string

See Also:

Constant Field Values

dest

protected int dest

The destination (typically an index into a register set)

src1

protected int src1

The first source parameter

src2

protected int src2

The second source parameter

rd

protected int rd

The relative displacement

cc

protected int cc

The condition code

z_flag

protected int z_flag

Shadow Z (Zero) flag

n_flag

protected int n_flag

Shadow N (negative) flag

c_flag

protected int c_flag

Shadow C (carry) flag

v_flag

protected int v_flag

Shadow V (overflow) flag

s1_flag

protected int s1_flag

Shadow S1 (saturate) flag

s2_flag

protected int s2_flag

Shadow S2 (saturate) flag

e1_flag

protected int e1_flag

Shadow E1 (interrupt mask) flag

e2_flag

protected int e2_flag

Shadow E2 (interrupt mask) flag

SREG_MAP

public static final int[][] SREG_MAP

This maps the index used by the simulator to represent the special register address to the address used by hardware. This is done because the address map of the special registers is so sparsely populated.

regSymbols

protected static final AutoModel.Symbol[] regSymbols

The General Purpose Register Symbols

sregSymbols

protected static final AutoModel.Symbol[] sregSymbols

The Special Purpose Register Symbols

ccSymbols

protected static final AutoModel.Symbol[] ccSymbols

The condition code symbols

fSymbols

protected static final AutoModel.Symbol[] fSymbols

The Flags update flag

zzSymbols

protected static final AutoModel.Symbol[] zzSymbols

The Data Size flag (.zz) Symbols

xSymbols

protected static final AutoModel.Symbol[] xSymbols

The Sign Extend flag (.x) Symbols

ndSymbols

protected static final AutoModel.Symbol[] ndSymbols

The Delay Slot flag (.nd) Symbols

aaSymbols

protected static final AutoModel.Symbol[] aaSymbols

The Load write-back mode (.aa) Symbols

diSymbols

protected static final AutoModel.Symbol[] diSymbols

The Data Cache mode (.di) Symbols

op

protected static final AutoModel.Field op

op2

protected static final AutoModel.Field op2

p

protected static final AutoModel.Field p

a

protected static final AutoModel.Field a

op3

protected static final AutoModel.Field op3

b

protected static final AutoModel.Field b

bhi

protected static final AutoModel.Field bhi

c

protected static final AutoModel.Field c

u6

protected static final AutoModel.Field u6

u7

protected static final AutoModel.Field u7

f

protected static final AutoModel.Field f

bit4

protected static final AutoModel.Field bit4

s6hi

protected static final AutoModel.Field s6hi

s6lo

protected static final AutoModel.Field s6lo

s10hi

protected static final AutoModel.Field s10hi

s9hi

protected static final AutoModel.Field s9hi

s11lo

protected static final AutoModel.Field s11lo

s8lo

protected static final AutoModel.Field s8lo

op2b

protected static final AutoModel.Field op2b

q

protected static final AutoModel.Field q

t

protected static final AutoModel.Field t

nd

protected static final AutoModel.Field nd

bit5

protected static final AutoModel.Field bit5

bit15

protected static final AutoModel.Field bit15

bit16

protected static final AutoModel.Field bit16

bit17

protected static final AutoModel.Field bit17

zz1

protected static final AutoModel.Field zz1

x1

protected static final AutoModel.Field x1

aa1

protected static final AutoModel.Field aa1

di1

protected static final AutoModel.Field di1

zz2

protected static final AutoModel.Field zz2

x2

protected static final AutoModel.Field x2

aa2

protected static final AutoModel.Field aa2

di2

protected static final AutoModel.Field di2

ldop2

protected static final AutoModel.Field ldop2

zz3

protected static final AutoModel.Field zz3

aa3

protected static final AutoModel.Field aa3

di3

protected static final AutoModel.Field di3

all32

protected static final AutoModel.Field all32

op16

protected static final AutoModel.Field op16

a16

protected static final AutoModel.Field a16

b16

protected static final AutoModel.Field b16

c16

protected static final AutoModel.Field c16

op16_2

protected static final AutoModel.Field op16_2

u3_16

protected static final AutoModel.Field u3_16

u7_16

protected static final AutoModel.Field u7_16

h16

protected static final AutoModel.Field h16

h16hi

protected static final AutoModel.Field h16hi

sp16

protected static final AutoModel.Field sp16

s3_4

protected static final AutoModel.Field s3_4

s5_7

protected static final AutoModel.Field s5_7

s7

protected static final AutoModel.Field s7

s9_10

protected static final AutoModel.Field s9_10

s12

protected static final AutoModel.Field s12

s13

protected static final AutoModel.Field s13

s21

protected static final AutoModel.Field s21

s25

protected static final AutoModel.Field s25

fmt_bc

protected static final AutoModel.Format fmt_bc

fmt_bu6

protected static final AutoModel.Format fmt_bu6

fmt_bs12

protected static final AutoModel.Format fmt_bs12

fmt_abc

protected static final AutoModel.Format fmt_abc

fmt_abu6

protected static final AutoModel.Format fmt_abu6

fmt_bbs12

protected static final AutoModel.Format fmt_bbs12

fmt_bbc

protected static final AutoModel.Format fmt_bbc

fmt_bbu6

protected static final AutoModel.Format fmt_bbu6

fmt_s21

protected static final AutoModel.Format fmt_s21

fmt_s25

protected static final AutoModel.Format fmt_s25

fmt_bcs9

protected static final AutoModel.Format fmt_bcs9

fmt_bu6s9

protected static final AutoModel.Format fmt_bu6s9

fmt_qbc

protected static final AutoModel.Format fmt_qbc

fmt_qbu6

protected static final AutoModel.Format fmt_qbu6

fmt_dbc

protected static final AutoModel.Format fmt_dbc

fmt_dbu6

protected static final AutoModel.Format fmt_dbu6

fmt_c

protected static final AutoModel.Format fmt_c

fmt_u6

protected static final AutoModel.Format fmt_u6

fmt_s12

protected static final AutoModel.Format fmt_s12

fmt_jc

protected static final AutoModel.Format fmt_jc

fmt_ju6

protected static final AutoModel.Format fmt_ju6

fmt_ldabs9

protected static final AutoModel.Format fmt_ldabs9

fmt_ldabc

protected static final AutoModel.Format fmt_ldabc

fmt_u7

protected static final AutoModel.Format fmt_u7

fmt_s13

protected static final AutoModel.Format fmt_s13

fmt_cbs9

protected static final AutoModel.Format fmt_cbs9

allbits

protected static final AutoModel.Format allbits

fmt16

protected static final AutoModel.Format fmt16

fmt16_bc

protected static final AutoModel.Format fmt16_bc

fmt16_abc

protected static final AutoModel.Format fmt16_abc

fmt16_cbu3

protected static final AutoModel.Format fmt16_cbu3

fmt16_bbh

protected static final AutoModel.Format fmt16_bbh

fmt16_bspu7

protected static final AutoModel.Format fmt16_bspu7

Constructor Detail

ARC700

public ARC700()

The constructor

Method Detail

main

public static void main(java.lang.String[] args)

This enables the stand-alone assembler and disassembler. The command line should be either: java ARC700 -dasm or java ARC700 -asm

Parameters:

args - the command line arguments.

getPC

public int getPC()

Description copied from class: Processor

This method returns the current Program Counter.

Overrides:

getPC in class AutoModel

Returns:

This method returns the current Program Counter.

setPC

public void setPC(int pc)

Description copied from class: Processor

This method sets the current Program Counter.

Overrides:

setPC in class AutoModel

reset

public void reset()

This method resets the processor. Note that super.reset() must me called to completely intialize the processor.

Overrides:

reset in class Processor

fetch

public long fetch(int addr,
                  int bytes)
           throws MemoryAccessException

Description copied from class: AutoModel

This method returns a long (64-bit) value based on the data at 'bytes' bytes of memory at address 'addr'. This takes into account endian. This is provided as a public function to permit overloading for processors that may need unusual functionality when fetching instructions (I'm talking about ARC here).

Overrides:

fetch in class AutoModel

Parameters:

addr - The address of the fetch.

bytes - The number of bytes in the fetch.

Returns:

This method returns a long (64-bit) value based on the data at 'bytes' bytes of memory at address 'addr'.

Throws:

MemoryAccessException - when an attempt is made to access an illegal memory address.

preExecute

public void preExecute(int instr)
                throws MemoryAccessException

Description copied from class: AutoModel

This method is called immediately before execution and may be overloaded to do things like save instruction field values to locals.

Overrides:

preExecute in class AutoModel

Parameters:

instr - The instruction

Throws:

MemoryAccessException - A Memory Access Exception is thrown is an illegal memory access is attempted.

postExecute

public void postExecute(int instr)

Description copied from class: AutoModel

This method is called immediately after execution and may be overloaded to do things like save instruction field values to locals.

Overrides:

postExecute in class AutoModel

Parameters:

instr - The instruction

dasmFixup

public void dasmFixup(long instrData,
                      AutoModel.Instruction instr)

Description copied from class: AutoModel

This method can be overloaded to fix up any problems or to do any clean-up in the disassembler. This method is called after the data from the instruction has been broken down into the fields in the instr object. Most of what is done here is to adjust the field.val values to take care of disjoint or shifted fields.

Overrides:

dasmFixup in class AutoModel

Parameters:

instrData - The instruction to be diassembled.

instr - The description of the instruction to be diassembled.

addOverflow

public static int addOverflow(int src1,
                              int src2,
                              int result)

This method is used to determine if an add overflow has occurred. This is done by checking the signs of the source operands against the sign of the result.

Parameters:

src1 - The first source operand.

src2 - The second source operand.

result - The result of the operation on the src1 and src2 parameters.

Returns:

This method returns a true if an overflow was detected and false otherwise.

subOverflow

public static int subOverflow(int src1,
                              int src2,
                              int result)

This method is used to determine if a sub overflow has occurred. This is done by checking the signs of the source operands against the sign of the result.

Parameters:

src1 - The first source operand.

src2 - The second source operand.

result - The result of the operation on the src1 and src2 parameters.

Returns:

This method returns a true if an overflow was detected and a false otherwise.

addCarry

public static int addCarry(int src1,
                           int src2,
                           int result)

This method is used to determine if an add carry has occurred. This is done by checking the signs of the source operands against the sign of the result.

Parameters:

src1 - The first source operand.

src2 - The second source operand.

result - The result of the operation on the src1 and src2 parameters.

Returns:

This method returns a one if a carry was detected and a zero otherwise.

subCarry

public static int subCarry(int src1,
                           int src2,
                           int result)

This method is used to determine if a sub carry has occurred. This is done by checking the signs of the source operands against the sign of the result.

Parameters:

src1 - The first source operand.

src2 - The second source operand.

result - The result of the operation on the src1 and src2 parameters.

Returns:

This method returns a one if a carry was detected and a zero otherwise.

sign

public static int sign(int a)

This method returns the sign bit for 32 bit value.

Parameters:

a - The 32 bit value.

Returns:

This method returns the sign bit for 32 bit value.

zero

public static int zero(int a)

This method returns '1' if the parameter 'a' is a zero and '0' otherwise. This is used to set the 'zero' flag.

Parameters:

a - The parameter to be tested for zero.

Returns:

This method returns the sign bit for 32 bit value.

op

protected static AutoModel.Decode op(int _op)

This is a helper function used in decoding simple one opcode ARC700 instructions. It mostly makes the Instruction table easier to read.

Parameters:

_op - The code for the op field.

Returns:

This method returns a decoder for a one opcode ARC700 instruction.

op

protected static AutoModel.Decode op(int _op,
                                     int _op2)

This is a helper function used in decoding simple two opcode ARC700 instructions. It mostly makes the Instruction table easier to read.

Parameters:

_op - The code for the op field (I[31:26]).

_op2 - The code for the op2 field.

Returns:

This method returns a decoder for a two opcode ARC700 instruction.

op

protected static AutoModel.Decode op(int _op,
                                     int _op2,
                                     int _a)

This is a helper function used in decoding three opcode ARC700 instructions. It mostly makes the Instruction table easier to read.

Parameters:

_op - The code for the op field (I[31:26]).

_op2 - The code for the op2 field.

_a - The code for the a field.

Returns:

This method returns a decodeer for a three opcode ARC700 instruction.

bbit

protected static AutoModel.Decode bbit(int _op2b)

This is a helper function used in decoding the BBIT ARC700 instructions. It mostly makes the Instruction table easier to read.

Parameters:

_op2b - The code for the bop2 field (I[3:0]).

Returns:

This method returns a decoder for a BBIT ARC700 instruction.

blcc

protected static AutoModel.Decode blcc()

This is a helper function used in decoding the BLcc ARC700 instructions. It mostly makes the Instruction table easier to read.

Returns:

This method returns a decoder for a BLcc ARC700 instruction.

brcc

protected static AutoModel.Decode brcc()

This is a helper function used in decoding the BRcc ARC700 instructions. It mostly makes the Instruction table easier to read.

Returns:

This method returns a decoder for a BRcc ARC700 instruction.

ld2

protected static AutoModel.Decode ld2()

This is a helper function used in decoding the LD ARC700 instructions. It mostly makes the Instruction table easier to read.

Returns:

This method returns a decoder for a LD ARC700 instruction.

opAll

protected static AutoModel.Decode opAll(int a)

This is a helper function used in decoding the special no parameter ARC700 instructions. This takes a single 32 bit field completely describing the instruction. It mostly makes the Instruction table easier to read.

Parameters:

a - The 32-bit opcode.

Returns:

This method returns a decoder for a no parameter ARC700 instruction.

op16

protected static AutoModel.Decode op16(int _op)

This is a helper function used in decoding ARC700 16-bit instructions with a single decode field.

Parameters:

_op - The 5-bit primary opcode for 16-bit instructions.

Returns:

This method returns a decoder for a 16-bit ARC700 instruction.

op16

protected static AutoModel.Decode op16(int _op,
                                       int _op2)

This is a helper function used in decoding ARC700 16-bit instructions with two decode fields.

Parameters:

_op - The 5-bit primary opcode for 16-bit instructions.

_op2 - The 5-bit secondary opcode for 16-bit instructions.

Returns:

This method returns a decoder for a 16-bit ARC700 instruction.

op16

protected static AutoModel.Decode op16(int _op,
                                       int _a,
                                       int _b,
                                       int _c)

This is a helper function used in decoding ARC700 16-bit instructions with four decode fields.

Parameters:

_op - The 5-bit primary opcode for 16-bit instructions.

_a - The 5-bit secondary opcode / 'a' field for 16-bit instructions.

_b - The 3-bit 'b' field for 16-bit instructions.

_c - The 3-bit 'c' field for 16-bit instructions.

Returns:

This method returns a decoder for a 16-bit ARC700 instruction.

op3

protected static AutoModel.Decode op3(int _op,
                                      int _op2,
                                      int _p)

This is a helper function used in decoding simple three opcode ARC700 instructions. It mostly makes the Instruction table easier to read.

Parameters:

_op - The code for the op field (I[31:26]).

_op2 - The code for the op2 field.

_p - The code for the p field.

Returns:

This method returns a decoder for a three opcode ARC700 instruction.

op3

protected static AutoModel.Decode op3(int _op,
                                      int _op2,
                                      int _p,
                                      int _bit5)

This is a helper function used in decoding simple three opcode ARC700 instructions. It mostly makes the Instruction table easier to read.

Parameters:

_op - The code for the op field (I[31:26]).

_op2 - The code for the op2 field.

_p - The code for the p field.

_bit5 - The code for the bit5 field. Usually only used when p = 3.

Returns:

This method returns a decoder for a three opcode ARC700 instruction.