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macross/actions_68000.c
Michael Steil 4bed39833e added license headers and README.md
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/*
* Copyright (c) 1987 Fujitsu
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
actions.c -- Actions associated with various machine instruction
classes (68000 version).
Chip Morningstar -- Lucasfilm Ltd.
26-April-1985
*/
#include "macrossTypes.h"
#include "macrossGlobals.h"
#define binary opcode->opcode
#define altBinary opcode->subClass
#define sub opcode->subClass
#define mode(n) ((evaluatedOperands[n])->addressMode)
#define trueMode(n) (operandKindField(mode(n)))
#define address(n) (evaluatedOperands[n]->value)
#define forward(n) (!isDefined(evaluatedOperands[n]))
#define register(n) (getRegister(mode(n)))
#define controlRegister(n) (trueMode(n)==USP_REGISTER_OPND ? \
0x800 : (register(n) == SFC_REGISTER ? \
0x000 : (register(n) == DFC_REGISTER ? \
0x001 : 0x801)))
#define eaPC(n) (effectiveAddressBits(mode(n), address(n), \
forward(n), TRUE))
#define eaNoPC(n) (effectiveAddressBits(mode(n), address(n), \
forward(n), FALSE))
#define eaFlop(n) (eaNoPC(n)>>3 | (eaNoPC(n)&7)<<3)
#define extendPC(n) emitPossibleExtension(address(n), mode(n), binary, n,\
forward(n), TRUE)
#define extendNoPC(n) emitPossibleExtension(address(n), mode(n), binary, n,\
forward(n), FALSE)
#define check(g, n) ((operandClassTable[(int)trueMode(n)] &\
g) != 0)
#define defcheck(n) isDefined(evaluatedOperands[n])
#define check1(g) (numberOfOperands==1 && check(g, 0))
#define check2(g1, g2) (numberOfOperands==2 && check(g1, 0) && check(g2, 1))
/*#define check1(g) (numberOfOperands==1 && check(g, 0) && defcheck(0))
#define check2(g1, g2) (numberOfOperands==2 && check(g1, 0) && check(g2, 1)\
&& defcheck(0) && defcheck(1))*/
#define iifCheck0() if (numberOfOperands==0) {
#define iifCheck1(g) if (check1(g)) {
#define eifCheck1(g) } else if (check1(g)) {
#define iifCheck2(g1, g2) if (check2(g1, g2)) {
#define eifCheck2(g1, g2) } else if (check2(g1, g2)) {
#define done } else {\
error(INAPPROPRIATE_ADDRESS_MODES_ERROR);\
}
#define D_TO_EA_BIT 0x0100
#define EA_TO_D_BIT 0x0000
#define R_SHIFT 9
#define Q_DATA_SHIFT 9
#define OP_SIZE_BITS 0x00C0
#define BYTE_OP_SIZE_BITS 0x0000
#define WORD_OP_SIZE_BITS 0x0040
#define LONG_OP_SIZE_BITS 0x0080
#define byteOp(op) (((op) & OP_SIZE_BITS) == BYTE_OP_SIZE_BITS)
#define wordOp(op) (((op) & OP_SIZE_BITS) == WORD_OP_SIZE_BITS)
#define longOp(op) (((op) & OP_SIZE_BITS) == LONG_OP_SIZE_BITS)
#define MOVE_OP_SIZE_BITS 0x3000
#define MOVE_BYTE_OP_SIZE_BITS 0x1000
#define MOVE_WORD_OP_SIZE_BITS 0x3000
#define MOVE_LONG_OP_SIZE_BITS 0x2000
#define moveByteOp(op) (((op) & MOVE_OP_SIZE_BITS) == \
MOVE_BYTE_OP_SIZE_BITS)
#define moveWordOp(op) (((op) & MOVE_OP_SIZE_BITS) == \
MOVE_WORD_OP_SIZE_BITS)
#define moveLongOp(op) (((op) & MOVE_OP_SIZE_BITS) == \
MOVE_LONG_OP_SIZE_BITS)
#define isMoveOp(op) ((op)==0x1000 || (op)==0x2000 || (op)==0x3000)
#define byteOpGeneral(op) (isMoveOp(op) ? moveByteOp(op) : byteOp(op))
#define wordOpGeneral(op) (isMoveOp(op) ? moveWordOp(op) : wordOp(op))
void emitPossibleExtension();
#define emitImmediate(n) \
if (byteOp(binary)) {\
if (byteCheck(address(n))) {\
emitByte(0);\
putFixupsHere(BYTE_FIXUP, n);\
emitByte(address(n));\
}\
} else if (wordOp(binary)) {\
if (wordCheck(address(n))) {\
putFixupsHere(WORD_FIXUP, n);\
emitWord(address(n));\
}\
} else {\
putFixupsHere(LONG_FIXUP, n);\
emitLong(address(n));\
}
/*
These routines are vectored off of the opcode lookup table. Each
instruction is of a particular category that defines which address modes
it accepts its operands in and what size the operands are. There is one
"actionsXXXX" routine for each of these categories that grabs the operands,
checks their address modes, and emits the binary instruction and operands.
*/
/* Class I: abcd, addxb, addxw, addxl, sbcd, subxb, subxw, subxl */
void
actionsClassI(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define D_REGISTER_BIT_I 0x0000
#define PREDECREMENT_BIT_I 0x0008
iifCheck2(GROUP_A, GROUP_A)
emitWord(binary | register(1)<<R_SHIFT | register(0) |
D_REGISTER_BIT_I);
eifCheck2(GROUP_D, GROUP_D)
emitWord(binary | register(1)<<R_SHIFT | register(0) |
PREDECREMENT_BIT_I);
done
}
/* Class II: addb, addw, addl, subb, subw, subl (implicitly includes addib,
addiw, addil, addaw, addal, subib, subiw, subil, subab, subaw, subal)
*/
void
actionsClassII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define WORD_ADDR_BITS_II 0x00C0
#define LONG_ADDR_BITS_II 0x01C0
iifCheck2(GROUP_A, GROUP_S)
emitWord(binary | register(0)<<R_SHIFT | D_TO_EA_BIT | eaNoPC(1));
extendNoPC(1);
eifCheck2(GROUP_F, GROUP_P)
emitWord(altBinary | eaNoPC(1));
emitImmediate(0);
extendNoPC(1);
eifCheck2(GROUP_O, GROUP_A)
if (!byteOp(binary) || trueMode(0)!=A_REGISTER_OPND) {
emitWord(binary | register(1)<<R_SHIFT | EA_TO_D_BIT |
eaPC(0));
extendPC(0);
} else {
error(CANT_DO_OP_FROM_A_REGISTER_ERROR);
}
eifCheck2(GROUP_O, GROUP_B)
if (wordOp(binary)) {
emitWord(binary | register(1)<<R_SHIFT | WORD_ADDR_BITS_II |
eaPC(0));
extendPC(0);
} else if (longOp(binary)) {
emitWord(binary | register(1)<<R_SHIFT | LONG_ADDR_BITS_II |
eaPC(0));
extendPC(0);
} else {
error(CANT_DO_BYTE_ADDRESS_OP_ERROR);
}
done
}
/* Class III: addqb, addqw, addql, subqb, subqw, subql */
void
actionsClassIII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck2(GROUP_F, GROUP_N)
if (forward(0)) {
error(FORWARD_REFERENCE_NOT_ALLOWED_HERE_ERROR);
} else if (0<address(0) && address(0)<=8) {
emitWord(binary | (address(0)%8)<<Q_DATA_SHIFT | eaNoPC(1));
extendNoPC(1);
} else {
error(QUICK_DATA_OUT_OF_RANGE_ERROR, address(0));
}
done
}
/* Class IV: andb, andw, andl, orb, orw, orl (implicitly includes andib,
andiw, andil, orib, oriw, oril, andiccr, oriccr, andisr, orisr) */
void
actionsClassIV(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define CCR_BITS_IV 0x003C
#define SR_BITS_IV 0x007C
iifCheck2(GROUP_A, GROUP_S)
emitWord(binary | register(0)<<R_SHIFT | D_TO_EA_BIT | eaNoPC(1));
extendNoPC(1);
eifCheck2(GROUP_F, GROUP_H)
if (byteOp(binary)) {
if (byteCheck(address(0))) {
emitWord(altBinary | CCR_BITS_IV);
emitByte(0);
putFixupsHere(BYTE_FIXUP, 0);
emitByte(address(0));
}
} else {
error(CCR_OP_IS_BYTE_OP_ERROR);
}
eifCheck2(GROUP_F, GROUP_I)
if (wordOp(binary)) {
if (wordCheck(address(0))) {
emitWord(altBinary | SR_BITS_IV);
putFixupsHere(WORD_FIXUP, 0);
emitWord(address(0));
}
} else {
error(SR_OP_IS_WORD_OP_ERROR);
}
eifCheck2(GROUP_F, GROUP_P)
emitWord(altBinary | eaNoPC(1));
emitImmediate(0);
extendNoPC(1);
eifCheck2(GROUP_Q, GROUP_A)
emitWord(binary | register(1)<<R_SHIFT | EA_TO_D_BIT | eaPC(0));
extendPC(0);
done
}
/* Class V: aslb, aslw, asll, asrb, asrw, asrl, lslb, lslw, lsll, lsrb, lsrw,
lsrl, rolb, rolw, roll, rorb, rorw, rorl, roxlb, roxlw, roxll, roxrb,
roxrw, roxrl */
void
actionsClassV(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define REGISTER_SHIFT_BIT_V 0x0020
#define MEMORY_SHIFT_BITS_V 0x00C0
#define LOGICAL_REGISTER_BIT_V 0x0008
#define LOGICAL_MEMORY_BIT_V 0x0200
#define ROTATE_REGISTER_BITS_V 0x0018
#define ROTATE_MEMORY_BITS_V 0x0600
#define ROTATEX_REGISTER_BITS_V 0x0010
#define ROTATEX_MEMORY_BITS_V 0x0400
iifCheck2(GROUP_A, GROUP_A)
emitWord(binary | register(0)<<R_SHIFT | REGISTER_SHIFT_BIT_V |
register(1) | (sub==1 ? LOGICAL_REGISTER_BIT_V : 0) |
(sub==2 ? ROTATE_REGISTER_BITS_V : 0) |
(sub==3 ? ROTATEX_REGISTER_BITS_V : 0));
eifCheck2(GROUP_F, GROUP_A)
if (forward(0))
error(FORWARD_REFERENCE_NOT_ALLOWED_HERE_ERROR);
else if (0<address(0) && address(0)<=8)
emitWord(binary | (address(0)%8)<<Q_DATA_SHIFT | register(1) |
(sub==1 ? LOGICAL_REGISTER_BIT_V : 0) |
(sub==2 ? ROTATE_REGISTER_BITS_V : 0) |
(sub==3 ? ROTATEX_REGISTER_BITS_V : 0));
else
error(QUICK_DATA_OUT_OF_RANGE_ERROR, address(0));
eifCheck1(GROUP_S)
if (wordOp(binary)) {
emitWord(binary | MEMORY_SHIFT_BITS_V | eaNoPC(0) |
(sub==1 ? LOGICAL_MEMORY_BIT_V : 0) |
(sub==2 ? ROTATE_MEMORY_BITS_V : 0) |
(sub==3 ? ROTATEX_MEMORY_BITS_V : 0));
extendNoPC(0);
} else {
error(SHIFT_OP_IS_WORD_OP_ERROR);
}
done
}
/* Class VI: bCC, bra, bsr */
void
actionsClassVI(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
int offset;
iifCheck1(GROUP_G)
if (forward(0))
offset = 0;
else
offset = address(0) - (currentLocationCounter.value -
targetOffset + 2);
if (isByteOffset(offset) && offset!=0) {
emitByte(binary);
emitByte(offset);
} else if (wordOffsetCheck(offset)) {
emitByte(binary);
emitByte(0);
putFixupsHere(WORD_RELATIVE_FIXUP, 0);
emitWord(offset);
}
done
}
/* Class VII: bchg, bclr, bset, btst */
void
actionsClassVII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define REGISTER_BIT_VII 0x0100
#define IMMEDIATE_BIT_VII 0x0800
iifCheck2(GROUP_A, GROUP_P)
emitWord(binary | register(0)<<R_SHIFT | eaNoPC(1) |
REGISTER_BIT_VII);
extendNoPC(1);
eifCheck2(GROUP_F, GROUP_P)
if (byteCheck(address(0))) {
emitWord(binary | eaNoPC(1) | IMMEDIATE_BIT_VII);
emitByte(0);
putFixupsHere(BYTE_FIXUP, 0);
emitByte(address(0));
extendNoPC(1);
}
done
}
/* Class VIII: chk, divs, divu, muls, mulu */
void
actionsClassVIII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck2(GROUP_Q, GROUP_A)
emitWord(binary | register(1)<<R_SHIFT | eaPC(0));
extendPC(0);
done
}
/* Class IX: clrb, clrw, clrl, nbcd, negxb, negxw, negxl, notb, notw, notl,
sCC, tas, tstb, tstw, tstl */
void
actionsClassIX(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_P)
emitWord(binary | eaNoPC(0));
extendNoPC(0);
done
}
/* Class X: cmpb, cmpw, cmpl */
void
actionsClassX(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define IMMEDIATE_BITS_X 0x0C00
#define REGISTER_BITS_X 0xB000
iifCheck2(GROUP_F, GROUP_P)
emitWord(binary | IMMEDIATE_BITS_X | eaNoPC(1));
emitImmediate(0);
extendNoPC(1);
eifCheck2(GROUP_O, GROUP_A)
emitWord(binary | register(1)<<R_SHIFT | REGISTER_BITS_X | eaPC(0));
extendPC(0);
eifCheck2(GROUP_O, GROUP_B)
if (!byteOp(binary)) {
emitWord(altBinary | register(1)<<R_SHIFT | eaPC(0));
extendPC(0);
} else {
error(CMP_ADDRESS_NOT_BYTE_OP_ERROR);
}
done
}
/* Class XI: cmpmb, cmpmw, cmpml */
void
actionsClassXI(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck2(GROUP_C, GROUP_C)
emitWord(binary | register(1)<<R_SHIFT | register(0));
done
}
/* Class XII: dbCC */
void
actionsClassXII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
int offset;
iifCheck2(GROUP_A, GROUP_G)
if (forward(1))
offset = 0;
else
offset = address(1) - (currentLocationCounter.value -
targetOffset + 2);
emitWord(binary | register(0));
if (wordOffsetCheck(offset)) {
putFixupsHere(WORD_RELATIVE_FIXUP, 1);
emitWord(offset);
}
done
}
/* Class XIII: eorb, eorw, eorl */
void
actionsClassXIII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define CCR_OP_XIII 0x0A3C
#define SR_OP_XIII 0x0A7C
iifCheck2(GROUP_A, GROUP_P)
emitWord(binary | register(0)<<R_SHIFT | eaNoPC(1));
extendNoPC(1);
eifCheck2(GROUP_F, GROUP_H)
if (byteCheck(address(0))) {
emitWord(CCR_OP_XIII);
emitByte(0);
putFixupsHere(BYTE_FIXUP, 0);
emitByte(address(0));
}
eifCheck2(GROUP_F, GROUP_I)
if (wordCheck(address(0))) {
emitWord(SR_OP_XIII);
putFixupsHere(WORD_FIXUP, 0);
emitWord(address(0));
}
eifCheck2(GROUP_F, GROUP_P)
emitWord(altBinary | eaNoPC(1));
emitImmediate(0);
extendNoPC(1);
done
}
/* Class XIV: exg */
void
actionsClassXIV(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define DATA_DATA_EXG_BITS_XIV 0x0040
#define DATA_ADDR_EXG_BITS_XIV 0x0048
#define ADDR_ADDR_EXG_BITS_XIV 0x0088
iifCheck2(GROUP_M, GROUP_M)
if (trueMode(0)==D_REGISTER_OPND && trueMode(1)==
D_REGISTER_OPND) { /* data<-->data */
emitWord(binary | register(0)<<R_SHIFT | register(1) |
DATA_DATA_EXG_BITS_XIV);
} else if (trueMode(0)==D_REGISTER_OPND) { /* data<-->addr */
emitWord(binary | register(0)<<R_SHIFT | register(1) |
DATA_ADDR_EXG_BITS_XIV);
} else if (trueMode(1)==D_REGISTER_OPND) { /* addr<-->data */
emitWord(binary | register(1)<<R_SHIFT | register(0) |
DATA_ADDR_EXG_BITS_XIV);
} else { /* addr<-->addr */
emitWord(binary | register(0)<<R_SHIFT | register(1) |
ADDR_ADDR_EXG_BITS_XIV);
}
done
}
/* Class XV: extw, extl, swap */
void
actionsClassXV(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_A)
emitWord(binary | register(0));
done
}
/* Class XVI: illegal, nop, reset, rte, rtr, rts, trapv */
void
actionsClassXVI(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck0()
emitWord(binary);
done
}
/* Class XVII: jmp, jsr, pea */
void
actionsClassXVII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_U)
emitWord(binary | eaPC(0));
extendPC(0);
done
}
/* Class XVIII: lea */
void
actionsClassXVIII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck2(GROUP_U, GROUP_B)
emitWord(binary | register(1)<<R_SHIFT | eaPC(0));
extendPC(0);
done
}
/* Class XIX: link */
void
actionsClassXIX(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck2(GROUP_B, GROUP_F)
if (wordOffsetCheck(address(1))) {
emitWord(binary | register(0));
putFixupsHere(WORD_FIXUP, 1);
emitWord(address(1));
}
done
}
/* Class XX: movb, movw, movl */
void
actionsClassXX(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define MOVE_TO_USP_OP 0x4E60
#define MOVE_FROM_USP_OP 0x4E68
#define MOVE_TO_CCR_OP 0x44C0
#define MOVE_FROM_CCR_OP 0x42C0
#define MOVE_TO_SR_OP 0x46C0
#define MOVE_FROM_SR_OP 0x40C0
#define MOVE_TO_CR_OP 0x4E7B
#define MOVE_FROM_CR_OP 0x4E7A
#define R_SHIFT_XX 12
#define EA_SHIFT_XX 6
#define A_REGISTER_BIT_XX 0x8000
iifCheck2(GROUP_B, GROUP_K)
if (moveLongOp(binary)) {
emitWord(MOVE_TO_USP_OP | register(0));
} else {
error(USP_MOVE_IS_LONG_OP_ERROR);
}
eifCheck2(GROUP_H, GROUP_P)
if (moveWordOp(binary)) {
emitWord(MOVE_FROM_CCR_OP | eaNoPC(1));
extendNoPC(1);
} else {
error(CCR_MOVE_IS_WORD_OP_ERROR);
}
eifCheck2(GROUP_I, GROUP_P)
if (moveWordOp(binary)) {
emitWord(MOVE_FROM_SR_OP | eaNoPC(1));
extendNoPC(1);
} else {
error(SR_MOVE_IS_WORD_OP_ERROR);
}
eifCheck2(GROUP_K, GROUP_B)
if (moveLongOp(binary)) {
emitWord(MOVE_FROM_USP_OP | register(1));
} else {
error(USP_MOVE_IS_LONG_OP_ERROR);
}
eifCheck2(GROUP_L, GROUP_M)
if (moveLongOp(binary)) {
emitWord(MOVE_FROM_CR_OP);
emitWord((trueMode(1)==A_REGISTER_OPND ? A_REGISTER_BIT_XX:0)
| register(1)<<R_SHIFT_XX | controlRegister(0));
} else {
error(CR_MOVE_IS_LONG_OP_ERROR);
}
eifCheck2(GROUP_M, GROUP_L)
if (moveLongOp(binary)) {
emitWord(MOVE_TO_CR_OP);
emitWord((trueMode(0)==A_REGISTER_OPND ? A_REGISTER_BIT_XX:0)
| register(0)<<R_SHIFT_XX | controlRegister(1));
} else {
error(CR_MOVE_IS_LONG_OP_ERROR);
}
eifCheck2(GROUP_O, GROUP_B)
if (!moveByteOp(binary)) {
emitWord(altBinary | register(1)<<R_SHIFT | eaPC(0));
extendPC(0);
} else {
error(ADDRESS_MOVE_NOT_BYTE_OP_ERROR);
}
eifCheck2(GROUP_O, GROUP_P)
if (!moveByteOp(binary) || trueMode(0)!=A_REGISTER_OPND) {
emitWord(binary | eaFlop(1)<<EA_SHIFT_XX | eaPC(0));
extendPC(0);
extendNoPC(1);
} else {
error(ADDRESS_MOVE_NOT_BYTE_OP_ERROR);
}
eifCheck2(GROUP_Q, GROUP_H)
if (moveWordOp(binary)) {
emitWord(MOVE_TO_CCR_OP | eaPC(0));
extendPC(0);
} else {
error(CCR_MOVE_IS_WORD_OP_ERROR);
}
eifCheck2(GROUP_Q, GROUP_I)
if (moveWordOp(binary)) {
emitWord(MOVE_TO_SR_OP | eaPC(0));
extendPC(0);
} else {
error(SR_MOVE_IS_WORD_OP_ERROR);
}
done
}
/* Class XXI: movemw, moveml */
void
actionsClassXXI(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
int mask;
int i;
#define FROM_MEMORY_BIT_XXI 0x0400
#define TO_MEMORY_BIT_XXI 0x0000
if (check(GROUP_R, 0)) {
mask = 0;
for (i=1; i<numberOfOperands; i++) {
if (check(GROUP_M, i)) {
mask = mask | (1 << (trueMode(i)==A_REGISTER_OPND ?
register(i)+8 : register(i)));
} else {
error(INAPPROPRIATE_ADDRESS_MODES_ERROR);
return;
}
}
emitWord(binary | FROM_MEMORY_BIT_XXI | eaPC(0));
emitWord(mask);
extendPC(0);
} else if (check(GROUP_T, numberOfOperands - 1)) {
mask = 0;
if (trueMode(numberOfOperands - 1) == PREDECREMENT_OPND) {
for (i=0; i<numberOfOperands-1; i++) {
if (check(GROUP_M, i)) {
mask = mask | (1 << (trueMode(i)==
A_REGISTER_OPND ? 7-register(i) :
15-register(i)));
} else {
error(INAPPROPRIATE_ADDRESS_MODES_ERROR);
return;
}
}
} else {
for (i=0; i<numberOfOperands-1; i++) {
if (check(GROUP_M, i)) {
mask = mask | (1 << (trueMode(i)==
A_REGISTER_OPND ? register(i)+8 :
register(i)));
} else {
error(INAPPROPRIATE_ADDRESS_MODES_ERROR);
return;
}
}
}
emitWord(binary | TO_MEMORY_BIT_XXI | eaNoPC(numberOfOperands - 1));
emitWord(mask);
extendNoPC(numberOfOperands - 1);
} else {
error(INAPPROPRIATE_ADDRESS_MODES_ERROR);
}
}
/* Class XXII: movepw, movepl */
void
actionsClassXXII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define TO_MEMORY_BIT_XXII 0x0080
#define FROM_MEMORY_BIT_XXII 0x0000
iifCheck2(GROUP_A, GROUP_E)
if (wordOffsetCheck(address(1))) {
emitWord(binary | register(0)<<R_SHIFT | register(1) |
TO_MEMORY_BIT_XXII);
putFixupsHere(WORD_FIXUP, 1);
emitWord(address(1));
}
eifCheck2(GROUP_E, GROUP_A)
if (wordOffsetCheck(address(0))) {
emitWord(binary | register(1)<<R_SHIFT | register(0) |
FROM_MEMORY_BIT_XXII);
putFixupsHere(WORD_FIXUP, 0);
emitWord(address(0));
}
done
}
/* Class XXIII: moveq */
void
actionsClassXXIII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define R_SHIFT_XXIII 1
iifCheck2(GROUP_F, GROUP_A)
if (byteCheck(address(0))) {
emitByte(binary | register(1)<<R_SHIFT_XXIII);
putFixupsHere(BYTE_FIXUP, 0);
emitByte(address(0));
}
done
}
/* Class XXIV: movsb, movsw, movsl */
void
actionsClassXXIV(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
#define R_SHIFT_XXIV 12
#define TO_MEMORY_BIT_XXIV 0x0800
#define FROM_MEMORY_BIT_XXIV 0x0000
#define A_REGISTER_BIT_XXIV 0x8000
iifCheck2(GROUP_M, GROUP_S)
emitWord(binary | eaNoPC(1));
emitWord((trueMode(0)==A_REGISTER_OPND ? A_REGISTER_BIT_XXIV : 0) |
register(0)<<R_SHIFT_XXIV | TO_MEMORY_BIT_XXIV);
extendNoPC(1);
eifCheck2(GROUP_S, GROUP_M)
emitWord(binary | eaNoPC(0));
emitWord((trueMode(1)==A_REGISTER_OPND ? A_REGISTER_BIT_XXIV : 0) |
register(1)<<R_SHIFT_XXIV | FROM_MEMORY_BIT_XXIV);
extendNoPC(0);
done
}
/* Class XXV: rtd */
void
actionsClassXXV(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_F)
if (wordOffsetCheck(address(0))) {
emitWord(binary);
putFixupsHere(WORD_FIXUP, 0);
emitWord(address(0));
}
done
}
/* Class XXVI: unlk */
void
actionsClassXXVI(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_B)
emitWord(binary | register(0));
done
}
/* Class XXVII: stop */
void
actionsClassXXVII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_F)
if (wordCheck(address(0))) {
emitWord(binary);
putFixupsHere(WORD_FIXUP, 0);
emitWord(address(0));
}
done
}
/* Class XXVIII: trap */
void
actionsClassXXVIII(opcode, numberOfOperands, evaluatedOperands)
opcodeTableEntryType *opcode;
int numberOfOperands;
valueType *evaluatedOperands[];
{
iifCheck1(GROUP_F)
if (forward(0)) {
error(FORWARD_REFERENCE_NOT_ALLOWED_HERE_ERROR);
} else if (0<=address(0) && address(0)<=0xF) {
emitWord(binary | address(0));
} else {
error(TRAP_DATA_TOO_LARGE_ERROR, address(0));
}
done
}
/*
Miscellaneous helper predicates.
*/
bool
isByte(value)
int value;
{
return (-129<value && value<256);
}
bool
isByteOffset(value)
int value;
{
return (-129<value && value<128);
}
bool
isByteAddress(value)
valueType *value;
{
return(value->kindOfValue==ABSOLUTE_VALUE && isByte(value->value));
}
bool
isWord(value)
int value;
{
return (-32769<value && value<65536);
}
bool
isWordOffset(value)
int value;
{
return (-32769<value && value<32768);
}
bool
byteCheck(value)
int value;
{
if (isByte(value)) {
return(TRUE);
} else {
error(BYTE_VALUE_TOO_LARGE_ERROR, value);
return(FALSE);
}
}
bool
wordCheck(value)
int value;
{
if (isWord(value)) {
return(TRUE);
} else {
error(WORD_VALUE_TOO_LARGE_ERROR, value);
return(FALSE);
}
}
bool
wordOffsetCheck(value)
int value;
{
if (isWordOffset(value)) {
return(TRUE);
} else {
printf("word: %d\n", value);
error(RELATIVE_OFFSET_VALUE_TOO_LARGE_ERROR, value);
return(FALSE);
}
}
bool
isDefined(value)
valueType *value;
{
return(value!=NULL && value->kindOfValue!=UNDEFINED_VALUE);
}
#define D_REGISTER_EA 0x0000
#define A_REGISTER_EA 0x0008
#define A_REGISTER_INDIRECT_EA 0x0010
#define POSTINCREMENT_EA 0x0018
#define PREDECREMENT_EA 0x0020
#define DISPLACEMENT_EA 0x0028
#define SELECTED_EA 0x0028
#define INDEXED_EA 0x0030
#define INDEX_SELECTED_EA 0x0030
#define PC_DISPLACEMENT_EA 0x003A
#define PC_INDEXED_EA 0x003B
#define IMMEDIATE_EA 0x003C
#define ABSOLUTE_SHORT_EA 0x0038
#define ABSOLUTE_LONG_EA 0x0039
int
effectiveAddressBits(operandKind, value, isForwardRef, pcRelativeOK)
operandKindType operandKind;
int value;
bool isForwardRef;
bool pcRelativeOK;
{
switch(operandKindField(operandKind)) {
case D_REGISTER_OPND:
return(D_REGISTER_EA | getRegister(operandKind));
break;
case A_REGISTER_OPND:
return(A_REGISTER_EA | getRegister(operandKind));
break;
case A_REGISTER_INDIRECT_OPND:
return(A_REGISTER_INDIRECT_EA | getRegister(operandKind));
break;
case POSTINCREMENT_OPND:
return(POSTINCREMENT_EA | getRegister(operandKind));
break;
case PREDECREMENT_OPND:
return(PREDECREMENT_EA | getRegister(operandKind));
break;
case DISPLACEMENT_OPND:
return(DISPLACEMENT_EA | getRegister(operandKind));
break;
case SELECTED_OPND:
return(SELECTED_EA | getRegister(operandKind));
break;
case INDEXED_OPND:
return(INDEXED_EA | getRegister(operandKind));
break;
case INDEX_SELECTED_OPND:
return(INDEX_SELECTED_EA | getRegister(operandKind));
break;
case PC_DISPLACEMENT_OPND:
return(PC_DISPLACEMENT_EA);
break;
case PC_INDEXED_OPND:
return(PC_INDEXED_EA);
break;
case IMMEDIATE_OPND:
return(IMMEDIATE_EA);
break;
case ABSOLUTE_SHORT_OPND:
return(ABSOLUTE_SHORT_EA);
break;
case ABSOLUTE_LONG_OPND:
return(ABSOLUTE_LONG_EA);
break;
case EXPRESSION_OPND:
if (pcRelativeOK && isWordOffset(value -
(currentLocationCounter.value - targetOffset
+ 2)) && !isForwardRef)
return(PC_DISPLACEMENT_EA);
else if (isWord(value) && !isForwardRef)
return(ABSOLUTE_SHORT_EA);
else
return(ABSOLUTE_LONG_EA);
break;
case STRING_OPND:
botch("string opnd to get ea\n");
break;
case BLOCK_OPND:
botch("block opnd to get ea\n");
break;
case CC_REGISTER_OPND:
case STATUS_REGISTER_OPND:
case USP_REGISTER_OPND:
case CONTROL_REGISTER_OPND:
botch("funny opnd to get ea\n");
break;
default:
botch("non-existant operand kind to get ea: %x\n",
operandKind);
break;
}
}
void
emitPossibleExtension(value, addressMode, opcode, operandNumber, isForwardRef,
pcRelativeOK)
int value;
operandKindType addressMode;
int opcode;
int operandNumber;
bool isForwardRef;
bool pcRelativeOK;
{
switch (operandKindField(addressMode)) {
case DISPLACEMENT_OPND:
case SELECTED_OPND:
case ABSOLUTE_SHORT_OPND:
case PC_DISPLACEMENT_OPND:
putFixupsHere(WORD_FIXUP, operandNumber);
wordCheck(value);
emitWord(value);
break;
case INDEXED_OPND:
case INDEX_SELECTED_OPND:
case PC_INDEXED_OPND:
emitByte(indexByte(addressMode));
putFixupsHere(BYTE_FIXUP,operandNumber);
byteCheck(value);
emitByte(value);
break;
case ABSOLUTE_LONG_OPND:
putFixupsHere(LONG_FIXUP, operandNumber);
emitLong(value);
break;
case IMMEDIATE_OPND:
if (byteOpGeneral(opcode)) {
emitByte(0);
putFixupsHere(BYTE_FIXUP, operandNumber);
byteCheck(value);
emitByte(value);
} else if (wordOpGeneral(opcode)) {
putFixupsHere(WORD_FIXUP, operandNumber);
wordCheck(value);
emitWord(value);
} else {
putFixupsHere(LONG_FIXUP, operandNumber);
emitLong(value);
}
break;
case EXPRESSION_OPND:
if (pcRelativeOK && isWordOffset(value -
(currentLocationCounter.value -
targetOffset)) && !isForwardRef) {
putFixupsHere(WORD_RELATIVE_FIXUP,
operandNumber);
emitWord(value - (currentLocationCounter.value -
targetOffset));
} else if (isWord(value) && !isForwardRef) {
putFixupsHere(WORD_FIXUP, operandNumber);
emitWord(value);
} else {
putFixupsHere(LONG_FIXUP, operandNumber);
emitLong(value);
}
break;
default:
break;
}
}
int
indexByte(operandKind)
operandKindType operandKind;
{
return((getIndexRegister(operandKind)<<4) | (getWL(operandKind)<<3));
}
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