// Static Functions ///////////////////////////////////////////////////
/// <summary>
/// Register RR,RI,RI(C) formats of the AND/NAND/OR/NOR/XOR/XNOR/ADD/SUB instructions.
/// </summary>
private static void RegisterALUInstructions([NotNull] InstructionRegistry registry)
{
const Int32 ALU_RR_OPCODE = 0;
const Int32 ALU_RI_OPCODE = 1;
const Int32 ALU_RIC_OPCODE = 2;
Tuple <string, Int32>[] alu_instructions =
{
/* (Mnemonic, Function) */
new Tuple <string, Int32>("and", 0),
new Tuple <string, Int32>("nand", 1),
new Tuple <string, Int32>("or", 2),
new Tuple <string, Int32>("nor", 3),
new Tuple <string, Int32>("xor", 4),
new Tuple <string, Int32>("xnor", 5),
new Tuple <string, Int32>("add", 6),
new Tuple <string, Int32>("sub", 7),
};
// Add RR, RI, and RI(C) formats for each instruction.
foreach (var pair in alu_instructions)
{
registry.Register(InstructionDefinitionFactory.CreateRRInstruction(
pair.Item1, ALU_RR_OPCODE, pair.Item2)); ///////// ADD $t0, $t1 :=: $t0 += $t1
registry.Register(InstructionDefinitionFactory.CreateRIStandardInstruction(
pair.Item1, ALU_RI_OPCODE, pair.Item2)); ///////// ADD $t0, $t1, 8 :=: $t0 = $t1 + 8
registry.Register(InstructionDefinitionFactory.CreateRIImplicitDestinationInstruction(
pair.Item1, ALU_RI_OPCODE, pair.Item2)); ///////// ADD $t0, 8 :=: $t0 += 8
registry.Register(InstructionDefinitionFactory.CreateRIStandardInstruction(
pair.Item1 + 'c', ALU_RIC_OPCODE, pair.Item2)); // ADDC $t0, $t1, 8 :=: if(c) $t0 = $t1 + 8
registry.Register(InstructionDefinitionFactory.CreateRIImplicitDestinationInstruction(
pair.Item1 + 'c', ALU_RIC_OPCODE, pair.Item2)); // ADDC $t0, 8 :=: if(c) $t0 += 8
}
}
/// <summary>
/// Register RR and RI formats of the SLL/SRL/SRA/ROL/ROR instructions.
/// </summary>
private static void RegisterShifterInstructions([NotNull] InstructionRegistry registry)
{
const Int32 SHIFTER_RR_OPCODE = 3;
const Int32 SHIFTER_RI_OPCODE = 4;
Tuple <string, Int32>[] shifter_instructions =
{
/* (Mnemonic, Function) */
new Tuple <string, Int32>("sll", 0),
new Tuple <string, Int32>("srl", 1),
new Tuple <string, Int32>("sra", 2),
new Tuple <string, Int32>("rol", 3),
new Tuple <string, Int32>("ror", 4),
};
// Add RR and RI formats for each instruction.
foreach (var pair in shifter_instructions)
{
registry.Register(InstructionDefinitionFactory.CreateRRInstruction(
pair.Item1, SHIFTER_RR_OPCODE, pair.Item2)); // SLL $t0, $t1 :=: $t0 << $t1
registry.Register(InstructionDefinitionFactory.CreateRIStandardInstruction(
pair.Item1, SHIFTER_RI_OPCODE, pair.Item2)); // SLL $t0, $t1, 8 :=: $t0 = $t1 << 8
registry.Register(InstructionDefinitionFactory.CreateRIImplicitDestinationInstruction(
pair.Item1, SHIFTER_RI_OPCODE, pair.Item2)); // SLL $t0, 8 :=: $t0 <<= 8
}
}
/// <summary>
/// Register the LI/LIC/LA/LAC/MOV/MOVC pseudo instructions.
/// </summary>
private static void RegisterDataTransferPseudoInstructions([NotNull] InstructionRegistry registry)
{
// LI $t0, 8 :=: $t0 = 8
registry.Register(
InstructionDefinitionFactory.CreateRISourceRegisterUnusedInstruction(
"li", 1, 2)); // OR $t0, $zero, 8
// LIC $t0, 8 :=: if(c) $t0 = 8
registry.Register(
InstructionDefinitionFactory.CreateRISourceRegisterUnusedInstruction(
"lic", 2, 2)); // ORC $t0, $zero, 8
// LA $t0, 8 :=: $t0 = 8
registry.Register(
InstructionDefinitionFactory.CreateRISourceRegisterUnusedInstruction(
"la", 1, 2)); // OR $t0, $zero, 8
// LAC $t0, 8 :=: if(c) $t0 = 8
registry.Register(
InstructionDefinitionFactory.CreateRISourceRegisterUnusedInstruction(
"lac", 2, 2)); // ORC $t0, $zero, 8
// MOV $t0, $t1 :=: $t0 = $t1
registry.Register(
InstructionDefinitionFactory.CreateRRInstruction(
"la", 1, 2)); // OR $t0, $t1, 0
// MOVC $t0, $t1 :=: if(c) $t0 = $t1
registry.Register(
InstructionDefinitionFactory.CreateRRInstruction(
"lac", 2, 2)); // ORC $t0, $t1, 0
}
/// <summary>
/// Register RR and RI formats of the CEQ/CNEQ/CLT/CLTE/CLTU/CLTEU/CGT/CGTU instructions.
/// </summary>
private static void RegisterComparisonInstructions([NotNull] InstructionRegistry registry)
{
const Int32 COMPARATOR_RR_OPCODE = 5;
const Int32 COMPARATOR_RI_OPCODE = 6;
Tuple <string, Int32>[] comparison_instructions =
{
/* (Mnemonic, Function) */
new Tuple <string, Int32>("ceq", 0),
new Tuple <string, Int32>("cneq", 1),
new Tuple <string, Int32>("clt", 2),
new Tuple <string, Int32>("clte", 3),
new Tuple <string, Int32>("cltu", 4),
new Tuple <string, Int32>("clteu", 5),
new Tuple <string, Int32>("cgt", 6),
new Tuple <string, Int32>("cgtu", 7),
};
// Add RR and RI formats for each instruction.
foreach (var pair in comparison_instructions)
{
registry.Register(InstructionDefinitionFactory.CreateRRInstruction(
pair.Item1, COMPARATOR_RR_OPCODE, pair.Item2)); // CEQ $t0, $t1 :=: c = ($t0 == $t1)
registry.Register(InstructionDefinitionFactory.CreateRIDestinationRegisterUnusedInstruction(
pair.Item1, COMPARATOR_RI_OPCODE, pair.Item2)); // CEQ $t0, 8 :=: c = ($t0 == 8)
}
}
/// <summary>
/// Register: Register address, Immediate address, and Base-Offset addressing formats of the SB/SH instructions.
/// </summary>
private static void RegisterMemoryStoreInstructions([NotNull] InstructionRegistry registry)
{
const Int32 MEMORY_STORE_OPCODE = 8;
Tuple <string, Int32>[] memory_store_instructions =
{
/* (Mnemonic, Function) */
new Tuple <string, Int32>("sb", 7),
new Tuple <string, Int32>("sh", 6),
};
// Add Register, Immediate, and BaseOffset formats for each instruction.
foreach (var pair in memory_store_instructions)
{
registry.Register(InstructionDefinitionFactory.CreateRRInstruction(
pair.Item1, MEMORY_STORE_OPCODE, pair.Item2)); // SH $t0, $t1 :=: *($t1) = $t0
registry.Register(InstructionDefinitionFactory.CreateRISourceRegisterUnusedInstruction(
pair.Item1, MEMORY_STORE_OPCODE, pair.Item2)); // SH $t0, 0xFF :=: *(0xFF) = $t0
registry.Register(InstructionDefinitionFactory.CreateBaseOffsetInstruction(
pair.Item1, MEMORY_STORE_OPCODE, pair.Item2)); // SH $t0, 0xFF($t1) :=: *($t1 + 0xFF) = $t0
}
}
/// <summary>
/// Register: Register address, Immediate address, and Base-Offset addressing formats of the LB/LBU/LH instructions.
/// </summary>
private static void RegisterMemoryLoadInstructions([NotNull] InstructionRegistry registry)
{
const Int32 MEMORY_LOAD_OPCODE = 7;
Tuple <string, Int32>[] memory_load_instructions =
{
/* (Mnemonic, Function) */
new Tuple <string, Int32>("lb", 3),
new Tuple <string, Int32>("lbu", 4),
new Tuple <string, Int32>("lh", 1),
};
// Add Register, Immediate, and BaseOffset formats for each instruction.
foreach (var pair in memory_load_instructions)
{
registry.Register(InstructionDefinitionFactory.CreateRRInstruction(
pair.Item1, MEMORY_LOAD_OPCODE, pair.Item2)); // LH $t0, $t1 :=: $t0 = *($t1)
registry.Register(InstructionDefinitionFactory.CreateRISourceRegisterUnusedInstruction(
pair.Item1, MEMORY_LOAD_OPCODE, pair.Item2)); // LH $t0, 0xFF :=: $t0 = *(0xFF)
registry.Register(InstructionDefinitionFactory.CreateBaseOffsetInstruction(
pair.Item1, MEMORY_LOAD_OPCODE, pair.Item2)); // LH $t0, 0xFF($t1) :=: $t0 = *($t1 + 0xFF)
}
}
/// <summary>
/// Register the following instructions:
/// - HALT
/// </summary>
private static void RegisterMiscInstructions([NotNull] InstructionRegistry registry)
{
registry.Register(
InstructionDefinitionFactory.CreateOpcodeOnlyInstruction(
"halt", 31));
}
