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494 lines
14 KiB
C
494 lines
14 KiB
C
/*
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* Copyright (c) 1987 Fujitsu
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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actions.c -- Actions associated with various machine instruction
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classes (6502 version).
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Chip Morningstar -- Lucasfilm Ltd.
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16-November-1984
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*/
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#include "macrossTypes.h"
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#include "macrossGlobals.h"
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#define operand (evaluatedOperands[0])
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#define address (evaluatedOperands[0])->value
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#define class (evaluatedOperands[0])->addressMode
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#define binary opcode->opcode
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/*
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These routines are vectored off of the opcode lookup table. Each
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instruction is of a particular category that defines which address modes
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it accepts its operands in and what size (one byte or two) the operands
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are. There is one "actionsXXXX" routine for each of these categories that
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grabs the operand, checks the address mode, and emits the binary opcode
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and operand.
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*/
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bool isByteAddress (valueType *value);
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bool isDefined (valueType *value);
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extern void emitByte (byte byteValue);
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bool wordCheck (int value);
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extern void putFixupsHere (fixupKindType kindOfFixupsToPut, int whichFixup);
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extern void emitWord (wordType wordValue);
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bool byteCheck (int value);
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bool isByteOffset (int value);
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extern void error (errorType theError, ...);
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void
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actionsDir1(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define ZERO_PAGE_ADDRESS_BIT 0x00
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#define NON_ZERO_PAGE_ADDRESS_BIT 0x08
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if(class==EXPRESSION_OPND && isByteAddress(operand) &&
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isDefined(operand)){
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emitByte(binary | ZERO_PAGE_ADDRESS_BIT);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | NON_ZERO_PAGE_ADDRESS_BIT);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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void
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actionsDir2(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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if (wordCheck(address)) {
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emitByte(binary);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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void
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actionsDirIndir(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define DIRECT_ADDRESS_BIT 0x00
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#define INDIRECT_ADDRESS_BIT 0x20
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if (wordCheck(address)) {
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if (class == INDIRECT_OPND)
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emitByte(binary | INDIRECT_ADDRESS_BIT);
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else
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emitByte(binary | DIRECT_ADDRESS_BIT);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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void
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actionsDirX1(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_X1 0x04
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#define A_REGISTER_BITS_X1 0x08
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_X1 0x0C
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#define X_INDEXED_ZERO_PAGE_BITS_X1 0x14
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#define X_INDEXED_NON_ZERO_PAGE_BITS_X1 0x1C
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if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_X1);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_X1);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class==X_INDEXED_OPND || class==X_SELECTED_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | X_INDEXED_ZERO_PAGE_BITS_X1);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | X_INDEXED_NON_ZERO_PAGE_BITS_X1);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else {
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emitByte(binary | A_REGISTER_BITS_X1);
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}
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}
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void
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actionsDirX2(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_X2 0x00
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_X2 0x08
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#define X_INDEXED_ZERO_PAGE_BITS_X2 0x10
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#define X_INDEXED_NON_ZERO_PAGE_BITS_X2 0x18
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if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_X2);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_X2);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | X_INDEXED_ZERO_PAGE_BITS_X2);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | X_INDEXED_NON_ZERO_PAGE_BITS_X2);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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}
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void
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actionsDirX3(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_X2);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_X2);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else {
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if (byteCheck(address)) {
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emitByte(binary | X_INDEXED_ZERO_PAGE_BITS_X2);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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}
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}
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void
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actionsDirY(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_Y 0x00
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_Y 0x08
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#define Y_INDEXED_ZERO_PAGE_BITS_Y 0x10
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if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_Y);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_Y);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else {
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if (byteCheck(address)) {
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emitByte(binary | Y_INDEXED_ZERO_PAGE_BITS_Y);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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}
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}
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void
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actionsImmDir(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define IMMEDIATE_DATA_BITS_ID 0x00
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_ID 0x04
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_ID 0x0C
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if (class == IMMEDIATE_OPND) {
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if (byteCheck(address)) {
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emitByte(binary | IMMEDIATE_DATA_BITS_ID);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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} else {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_ID);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_ID);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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}
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void
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actionsImmDirX(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define IMMEDIATE_DATA_BITS_IX 0x00
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_IX 0x04
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_IX 0x0C
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#define X_INDEXED_ZERO_PAGE_BITS_IX 0x14
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#define X_INDEXED_NON_ZERO_PAGE_BITS_IX 0x1C
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if (class == IMMEDIATE_OPND) {
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if (byteCheck(address)) {
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emitByte(binary | IMMEDIATE_DATA_BITS_IX);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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} else if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_IX);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_IX);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | X_INDEXED_ZERO_PAGE_BITS_IX);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | X_INDEXED_NON_ZERO_PAGE_BITS_IX);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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}
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void
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actionsImmDirY(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define IMMEDIATE_DATA_BITS_IY 0x00
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_IY 0x04
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_IY 0x0C
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#define Y_INDEXED_ZERO_PAGE_BITS_IY 0x14
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#define Y_INDEXED_NON_ZERO_PAGE_BITS_IY 0x1C
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if (class == IMMEDIATE_OPND) {
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if (byteCheck(address)) {
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emitByte(binary | IMMEDIATE_DATA_BITS_IY);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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} else if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_IY);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary|DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_IY);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | Y_INDEXED_ZERO_PAGE_BITS_IY);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | Y_INDEXED_NON_ZERO_PAGE_BITS_IY);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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}
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}
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void
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actionsImmIndex(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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#define PRE_INDEXED_BITS_A 0x00
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#define DIRECT_ADDRESS_ZERO_PAGE_BITS_A 0x04
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#define IMMEDIATE_DATA_BITS_A 0x08
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#define DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_A 0x0C
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#define POST_INDEXED_BITS_A 0x10
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#define X_INDEXED_ZERO_PAGE_BITS_A 0x14
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#define Y_INDEXED_NON_ZERO_PAGE_BITS_A 0x18
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#define X_INDEXED_NON_ZERO_PAGE_BITS_A 0x1C
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if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_A);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary |DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_A);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class==X_INDEXED_OPND || class==X_SELECTED_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | X_INDEXED_ZERO_PAGE_BITS_A);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | X_INDEXED_NON_ZERO_PAGE_BITS_A);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class==Y_INDEXED_OPND || class==Y_SELECTED_OPND) {
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if (wordCheck(address)) {
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emitByte(binary | Y_INDEXED_NON_ZERO_PAGE_BITS_A);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class == IMMEDIATE_OPND) {
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if (byteCheck(address)) {
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emitByte(binary | IMMEDIATE_DATA_BITS_A);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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} else if (class == POST_INDEXED_Y_OPND) {
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if (byteCheck(address)) {
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emitByte(binary | POST_INDEXED_BITS_A);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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} else {
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if (byteCheck(address)) {
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emitByte(binary | PRE_INDEXED_BITS_A);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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}
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}
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void
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actionsIndex(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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if (class == EXPRESSION_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | DIRECT_ADDRESS_ZERO_PAGE_BITS_A);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary |DIRECT_ADDRESS_NON_ZERO_PAGE_BITS_A);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class==X_INDEXED_OPND || class==X_SELECTED_OPND) {
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if (isByteAddress(operand) && isDefined(operand)) {
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emitByte(binary | X_INDEXED_ZERO_PAGE_BITS_A);
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emitByte(address);
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} else if (wordCheck(address)) {
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emitByte(binary | X_INDEXED_NON_ZERO_PAGE_BITS_A);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class==Y_INDEXED_OPND || class==Y_SELECTED_OPND) {
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if (wordCheck(address)) {
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emitByte(binary | Y_INDEXED_NON_ZERO_PAGE_BITS_A);
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putFixupsHere(WORD_FIXUP, 0);
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emitWord(address);
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}
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} else if (class == POST_INDEXED_Y_OPND) {
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if (byteCheck(address)) {
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emitByte(binary | POST_INDEXED_BITS_A);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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} else {
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if (byteCheck(address)) {
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emitByte(binary | PRE_INDEXED_BITS_A);
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putFixupsHere(BYTE_FIXUP, 0);
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emitByte(address);
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}
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}
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}
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void
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actionsNone(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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emitByte(binary);
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}
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void
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actionsRelative(opcodeTableEntryType *opcode, int numberOfOperands, valueType **evaluatedOperands)
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{
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int offset;
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if (operand->kindOfValue == UNDEFINED_VALUE || (currentCodeMode ==
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RELOCATABLE_BUFFER && targetOffset == 0))
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offset = 0;
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else
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offset = address - (currentLocationCounter.value - targetOffset) - 1;
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if (offset < 0)
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offset--;
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if (isByteOffset(offset)) {
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emitByte(binary);
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putFixupsHere(BYTE_RELATIVE_FIXUP, 0);
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emitByte(offset);
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} else {
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error(RELATIVE_OFFSET_TOO_LARGE_ERROR);
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}
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}
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/*
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Miscellaneous helper predicates.
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*/
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bool
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isByte(int value)
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{
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return (-129<value && value<256);
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}
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bool
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isByteOffset(int value)
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{
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return (-129<value && value<128);
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}
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bool
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isWordOffset(int value)
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{
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return (-32769<value && value<32768);
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}
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bool
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isByteAddress(valueType *value)
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{
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return(value->kindOfValue==ABSOLUTE_VALUE && isByte(value->value));
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}
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bool
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isWord(int value)
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{
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return (-32769<value && value<65536);
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}
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bool
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byteCheck(int value)
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{
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if (isByte(value)) {
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return(TRUE);
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} else {
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error(BYTE_VALUE_TOO_LARGE_ERROR, value);
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return(FALSE);
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}
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}
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bool
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wordCheck(int value)
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{
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if (isWord(value)) {
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return(TRUE);
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} else {
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printf("word: %d\n", value);
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error(WORD_VALUE_TOO_LARGE_ERROR, value);
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
bool
|
|
isDefined(valueType *value)
|
|
{
|
|
return(value!=NULL && value->kindOfValue!=UNDEFINED_VALUE);
|
|
}
|