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code3254x.c
2798 lines (2486 loc) · 69.8 KB
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code3254x.c
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/* code3254x.c */
/*****************************************************************************/
/* Macro Assembler AS */
/* */
/* code generator for TI C54x DSP devices */
/* */
/* history: 2001-07-07: begun */
/* 2001-07-30: added simple accumulator instructions */
/* 2001-07-31: added address decoder */
/* 2001-08-03: ADD SUB */
/* 2001-08-05: MemAccOrders */
/* 2001-08-18: MemConstOrders */
/* 2001-08-19: multiply orders begun */
/* 2001-08-27: MPYA SQUR */
/* 2001-08-30: MACx begun */
/* 2001-08-31: MACD MACP MACSU MAS MASR MASAR */
/* 2001-09-16: DADD */
/* 2001-09-29: AND OR XOR SFTA SFTL */
/* 2001-09-30: FIRS BIT BITF */
/* 2001-10-03: CMPR */
/* 2001-10-14: B BD CALL CALLD */
/* 2001-10-17: B BD CC CCD */
/* 2001-10-20: FB FBD FCALL FCALLD */
/* 2001-10-24: RPT RPTB RPTBD */
/* 2001-10-25: RPTZ */
/* 2001-10-26: FRAME */
/* 2001-10-28: PSHM IDLE RSBX SSBX XC */
/* 2001-11-01: remaining non-parallel ops */
/* 2001-11-09: parallel ops */
/* 2001-11-11: added pseudo ops */
/* 2002-01-13: fixed undefined value of OK in some cases */
/* */
/*****************************************************************************/
/* $Id: code3254x.c,v 1.6 2010/04/17 13:14:20 alfred Exp $ */
/*****************************************************************************
* $Log: code3254x.c,v $
* Revision 1.6 2010/04/17 13:14:20 alfred
* - address overlapping strcpy()
*
* Revision 1.5 2007/11/24 22:48:03 alfred
* - some NetBSD changes
*
* Revision 1.4 2005/09/08 16:53:41 alfred
* - use common PInstTable
*
* Revision 1.3 2005/05/21 16:22:12 alfred
* - remove double variables, correct call-by-reference arg
*
* Revision 1.2 2004/05/29 12:18:05 alfred
* - relocated DecodeTIPseudo() to separate module
*
*****************************************************************************/
/*-------------------------------------------------------------------------*/
/* Includes */
#include "stdinc.h"
#include <string.h>
#include <ctype.h>
#include "bpemu.h"
#include "strutil.h"
#include "chunks.h"
#include "asmdef.h"
#include "asmsub.h"
#include "asmpars.h"
#include "asmallg.h"
#include "asmrelocs.h"
#include "asmcode.h"
#include "codepseudo.h"
#include "tipseudo.h"
#include "asmitree.h"
#include "codevars.h"
#include "fileformat.h"
#include "headids.h"
#include "code3254x.h"
/*-------------------------------------------------------------------------*/
/* Data Structures */
#define FixedOrderCnt 12
#define AccOrderCnt 16
#define Acc2OrderCnt 5
#define MemOrderCnt 9
#define XYOrderCnt 4
#define MemAccOrderCnt 17
#define MemConstOrderCnt 5
#define MacOrderCnt 3
#define ConditionCnt 23
typedef struct
{
Word Code;
Boolean IsRepeatable;
} FixedOrder;
typedef struct
{
Word Code;
Boolean IsRepeatable, Swap;
IntType ConstType;
} MemConstOrder;
typedef struct
{
char *Name;
Word Class, Code, Mask;
} Condition;
typedef enum {ModNone = - 1, ModAcc, ModMem, ModImm, ModAReg} ModType;
#define MModAcc (1 << ModAcc)
#define MModMem (1 << ModMem)
#define MModImm (1 << ModImm)
#define MModAReg (1 << ModAReg)
static LongInt Reg_CPL, Reg_DP, Reg_SP;
static Boolean ThisRep, LastRep, ForcePageZero;
static FixedOrder *FixedOrders, *AccOrders, *Acc2Orders, *MemOrders, *XYOrders,
*MemAccOrders, *MacOrders;
static MemConstOrder *MemConstOrders;
static Condition *Conditions;
static SimpProc SaveInitProc;
static CPUVar CPU320C541;
static IntType OpSize;
static ShortInt AdrMode;
static Word AdrVals[3];
static Boolean ThisPar;
static Word LastOpCode;
/*-------------------------------------------------------------------------*/
/* Address Decoder */
static char ShortConds[4][4] = {"EQ", "LT", "GT", "NEQ"};
static Boolean IsAcc(char *Asc)
{
return ((Asc[1] == '\0') && (mytoupper(*Asc) >= 'A') && (mytoupper(*Asc) <= 'B'));
}
static Boolean DecodeAdr(char *Asc, int Mask)
{
#define IndirCnt 16
static char *Patterns[IndirCnt] = /* leading asterisk is omitted since constant */
{ "ARx", "ARx-", "ARx+", "+ARx",
"ARx-0B", "ARx-0", "ARx+0", "ARx+0B",
"ARx-%", "ARx-0%", "ARx+%", "ARx+0%",
"ARx(n)", "+ARx(n)", "+ARx(n)%", "(n)"};
Boolean OK;
AdrMode = ModNone; AdrCnt = 0;
/* accumulators */
if (IsAcc(Asc))
{
AdrMode = ModAcc; *AdrVals = mytoupper(*Asc) - 'A';
goto done;
}
/* aux registers */
if ((strlen(Asc) == 3) && (!strncasecmp(Asc, "AR", 2)) && (Asc[2] >= '0') && (Asc[2] <= '7'))
{
AdrMode = ModAReg; *AdrVals = Asc[2] - '0';
goto done;
}
/* immediate */
if (*Asc == '#')
{
*AdrVals = EvalIntExpression(Asc + 1, OpSize, &OK);
if (OK)
AdrMode = ModImm;
goto done;
}
/* indirect */
if (*Asc == '*')
{
int z;
Word RegNum;
char *pConstStart, *pConstEnd;
/* check all possible patterns */
for (z = 0; z < IndirCnt; z++)
{
char *pPattern = Patterns[z], *pComp = Asc + 1;
/* pattern comparison */
RegNum = 0; pConstStart = pConstEnd = NULL; OK = TRUE;
while ((*pPattern) && (*pComp) && (OK))
{
switch (*pPattern)
{
case 'x': /* embedded number */
RegNum = *pComp - '0';
OK = RegNum < 8;
break;
case 'n': /* constant */
pConstStart = pComp;
pConstEnd = QuotPos(pComp, pPattern[1]);
if (pConstEnd)
pComp = pConstEnd - 1;
else
OK = False;
break;
default: /* compare verbatim */
if (mytoupper(*pPattern) != mytoupper(*pComp))
OK = False;
}
if (OK)
{
pPattern++; pComp++;
}
}
/* for a successful comparison, we must have reached the end of both strings
simultaneously. */
OK = OK && (!*pPattern) && (!*pComp);
if (OK)
break;
}
if (!OK) WrError(1350);
else
{
/* decode offset ? pConst... /must/ be set if such a pattern was successfully
decoded! */
if (strchr(Patterns[z], 'n'))
{
/* MMR-style instructions do not allow an extension word */
if (ForcePageZero)
{
WrError(1350);
OK = False;
}
else
{
char Save = *pConstEnd;
*pConstEnd = '\0';
AdrVals[1] = EvalIntExpression(pConstStart, Int16, &OK);
*pConstEnd = Save;
if (OK)
AdrCnt = 1;
}
}
/* all fine until now? Then do the rest... */
if (OK)
{
AdrMode = ModMem; AdrVals[0] = 0x80 | (z << 3) | RegNum;
}
}
goto done;
}
/* then try absolute resp. immediate if absolute not allowed */
if (Mask & MModMem)
{
FirstPassUnknown = FALSE;
*AdrVals = EvalIntExpression(Asc, UInt16, &OK);
if (OK)
{
if (Reg_CPL) /* short address rel. to SP? */
{
*AdrVals -= Reg_SP;
if ((NOT FirstPassUnknown) && (*AdrVals > 127))
WrError(110);
}
else /* on DP page ? */
{
if ((NOT FirstPassUnknown) && ((*AdrVals >> 7) != (Reg_DP)))
WrError(110);
}
AdrVals[0] &= 127;
AdrMode = ModMem;
}
}
else
{
*AdrVals = EvalIntExpression(Asc, OpSize, &OK);
if (OK)
AdrMode = ModImm;
}
done:
if ((AdrMode != ModNone) && (!(Mask & (1 << AdrMode))))
{
AdrMode = ModNone; AdrCnt = 0;
WrError(1350);
}
return (AdrMode != ModNone);
}
static Boolean MakeXY(Word *Dest, Boolean Quarrel)
{
Boolean Result = False;
if (AdrMode != ModMem); /* should never occur, if address mask specified correctly before */
else
{
Word Mode = (*AdrVals >> 3) & 15, Reg = *AdrVals & 7;
if ((Reg < 2) || (Reg > 5));
else if ((Mode != 0) && (Mode != 1) && (Mode != 2) && (Mode != 11));
else
{
*Dest = (Reg - 2) | ((Mode & 3) << 2);
Result = True;
}
}
if ((Quarrel) && (!Result))
WrError(1350);
return Result;
}
static Boolean DecodeCondition(int StartIndex, Word *Result, int *errindex, Boolean *ErrUnknown)
{
int z, z2;
Word CurrClass, CurrMask;
*Result = CurrMask = 0; CurrClass = 0xffff; *ErrUnknown = False;
for (z = StartIndex; z <= ArgCnt; z++)
{
for (z2 = 0; z2 < ConditionCnt; z2++)
if (!strcasecmp(ArgStr[z], Conditions[z2].Name))
break;
if (z2 >= ConditionCnt)
{
*ErrUnknown = True;
break;
}
if (CurrClass == 0xffff)
CurrClass = Conditions[z2].Class;
else if (CurrClass != Conditions[z2].Class)
break;
if (Conditions[z2].Mask & CurrMask)
break;
CurrMask |= Conditions[z2].Mask;
*Result |= Conditions[z2].Code;
}
*errindex = z;
return (CurrClass != 0xffff) && (z > ArgCnt);
}
/*-------------------------------------------------------------------------*/
/* Decoders */
static void DecodeFixed(Word Index)
{
FixedOrder *POrder = FixedOrders + Index;
if (ArgCnt != 0) WrError(1110);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else
{
WAsmCode[0] = POrder->Code; CodeLen = 1;
}
}
static void DecodeAcc(Word Index)
{
FixedOrder *POrder = AccOrders + Index;
if (ArgCnt != 1) WrError(1110);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else
{
if (DecodeAdr(ArgStr[1], MModAcc))
{
WAsmCode[0] = POrder->Code | (AdrVals[0] << 8); CodeLen = 1;
}
}
}
static void DecodeAcc2(Word Index)
{
FixedOrder *POrder = Acc2Orders + Index;
Boolean OK;
if ((ArgCnt < 1) || (ArgCnt > 2)) WrError(1110);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else
{
if (((OK = DecodeAdr(ArgStr[1], MModAcc))))
{
WAsmCode[0] = POrder->Code | (AdrVals[0] << 9);
if (ArgCnt == 2)
OK = DecodeAdr(ArgStr[2], MModAcc);
if (OK)
{
WAsmCode[0] |= (AdrVals[0] << 8);
CodeLen = 1;
}
}
}
}
static void DecodeMem(Word Index)
{
FixedOrder *POrder = MemOrders + Index;
if (ArgCnt < 1) WrError(1110);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else if (DecodeAdr(ArgStr[1], MModMem))
{
memcpy(WAsmCode, AdrVals, (AdrCnt + 1) << 1);
WAsmCode[0] |= POrder->Code;
CodeLen = 1 + AdrCnt;
}
}
static void DecodeXY(Word Index)
{
FixedOrder *POrder = XYOrders + Index;
Word TmpX, TmpY;
if (ArgCnt != 2) WrError(1350);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else
{
if (DecodeAdr(ArgStr[1], MModMem))
if (MakeXY(&TmpX, True))
if (DecodeAdr(ArgStr[2], MModMem))
if (MakeXY(&TmpY, True))
{
WAsmCode[0] = POrder->Code | (TmpX << 4) | TmpY;
CodeLen = 1;
}
}
}
static void DecodeADDSUB(Word Index)
{
Boolean OK;
Integer Shift;
Word DestAcc;
if ((ArgCnt < 2) || (ArgCnt > 4)) WrError(1110);
else
{
OpSize = SInt16;
DecodeAdr(ArgStr[1], MModAcc | MModMem | MModImm);
switch (AdrMode)
{
case ModAcc: /* ADD src, SHIFT|ASM [,dst] */
if (ArgCnt == 4) WrError(1110);
else if (ThisPar) WrError(1950);
else
{
Word SrcAcc = *AdrVals;
/* SrcAcc remains in AdrVals[0] if no 3rd operand, therefore
no extra assignment needed! */
if (ArgCnt == 3)
{
if (!DecodeAdr(ArgStr[3], MModAcc))
break;
}
/* distinguish variants of shift specification: */
if (!strcasecmp(ArgStr[2], "ASM"))
{
WAsmCode[0] = 0xf480 | Index | (SrcAcc << 9) | (*AdrVals << 8);
CodeLen = 1;
}
else
{
WAsmCode[0] = EvalIntExpression(ArgStr[2], SInt5, &OK);
if (OK)
{
WAsmCode[0] = (WAsmCode[0] & 0x1f) | 0xf400 | (Index << 5) | (SrcAcc << 9) | (*AdrVals << 8);
CodeLen = 1;
}
}
}
break;
case ModMem: /* ADD mem[, TS | SHIFT | Ymem], src[, dst] */
{
int HCnt;
/* rescue decoded address values */
memcpy(WAsmCode, AdrVals, (AdrCnt + 1) << 1);
HCnt = AdrCnt;
/* no shift? this is the case for two operands or three operands and the second is an accumulator */
if (ArgCnt == 2)
Shift = 0;
else if ((ArgCnt == 3) && (IsAcc(ArgStr[2])))
Shift = 0;
/* special shift value ? */
else if (!strcasecmp(ArgStr[2], "TS"))
Shift = 255;
/* shift address operand ? */
else if (*ArgStr[2] == '*')
{
Word Tmp;
/* break down source operand to reduced variant */
if (!MakeXY(WAsmCode, True))
break;
WAsmCode[0] = WAsmCode[0] << 4;
/* merge in second operand */
if (!DecodeAdr(ArgStr[2], MModMem))
break;
if (!MakeXY(&Tmp, True))
break;
WAsmCode[0] |= Tmp;
Shift = 254;
}
/* normal immediate shift */
else
{
Shift = EvalIntExpression(ArgStr[2], SInt6, &OK);
if (!OK)
break;
if ((FirstPassUnknown) && (Shift > 16))
Shift &= 15;
if (!ChkRange(Shift, -16 ,16))
break;
}
/* decode destination accumulator */
if (!DecodeAdr(ArgStr[ArgCnt], MModAcc))
break;
DestAcc = *AdrVals;
/* optionally decode source accumulator. If no second accumulator, result
again remains in AdrVals */
if ((ArgCnt == 4) || ((ArgCnt == 3) && (IsAcc(ArgStr[2]))))
{
if (!DecodeAdr(ArgStr[ArgCnt - 1], MModAcc))
break;
}
/* now start applying the variants */
if (Shift == 255) /* TS case */
{
if (*AdrVals != DestAcc) WrError(1350);
else if (ThisPar) WrError(1950);
else
{
WAsmCode[0] |= 0x0400 | (Index << 11) | (DestAcc << 8);
CodeLen = 1 + HCnt;
}
}
else if (Shift == 254) /* XY case */
{
if (*AdrVals != DestAcc) WrError(1350);
else if (ThisPar) WrError(1950);
else
{
WAsmCode[0] |= 0xa000 | (Index << 9) | (DestAcc << 8);
CodeLen = 1;
}
}
else if (Shift == 16) /* optimization for 16 shifts */
{
if (ThisPar) WrError(1950);
else
{
WAsmCode[0] |= (0x3c00 + (Index << 10)) | (*AdrVals << 9) | (DestAcc << 8);
CodeLen = 1 + HCnt;
}
}
else if ((DestAcc == *AdrVals) && (Shift == 0)) /* shortform without shift and with one accu only */
{
if (ThisPar)
{
AdrMode = ModMem; AdrVals[0] = WAsmCode[0];
if (MakeXY(AdrVals, True))
{
/* prev. operation must be STH src,0,Xmem */
if ((LastOpCode & 0xfe0f) != 0x9a00) WrError(1950);
else
{
RetractWords(1);
WAsmCode[0] = 0xc000 | (Index << 10) | (DestAcc << 8) | ((LastOpCode & 0x0100) << 1) | ((LastOpCode & 0x00f0) >> 4) | (*AdrVals << 4);
CodeLen = 1;
}
}
}
else
{
WAsmCode[0] |= 0x0000 | (Index << 11) | (DestAcc << 8);
CodeLen = 1 + HCnt;
}
}
else if (ThisPar) WrError(1950);
else
{
Word SrcAcc = *AdrVals;
/* fool MakeXY a bit */
AdrMode = ModMem; AdrVals[0] = WAsmCode[0];
if ((Shift >= 0) && (DestAcc == SrcAcc) && (MakeXY(WAsmCode, False))) /* X-Addr and positive shift */
{
WAsmCode[0] = 0x9000 | (Index << 9) | (WAsmCode[0] << 4) | (DestAcc << 8) | Shift;
CodeLen = 1;
}
else /* last resort... */
{
WAsmCode[0] |= 0x6f00;
WAsmCode[2] = WAsmCode[1]; /* shift optional address offset */
WAsmCode[1] = 0x0c00 | (Index << 5) | (SrcAcc << 9) | (DestAcc << 8) | (Shift & 0x1f);
CodeLen = 2 + HCnt;
}
}
break;
}
case ModImm: /* ADD #lk[, SHIFT|16], src[, dst] */
{
if (ThisPar) WrError(1950);
{
/* store away constant */
WAsmCode[1] = *AdrVals;
/* no shift? this is the case for two operands or three operands and the second is an accumulator */
if (ArgCnt == 2)
Shift = 0;
else if ((ArgCnt == 3) && (IsAcc(ArgStr[2])))
Shift = 0;
/* otherwise shift is second argument */
else
{
FirstPassUnknown = False;
Shift = EvalIntExpression(ArgStr[2], UInt5, &OK);
if (!OK)
break;
if ((FirstPassUnknown) && (Shift > 16))
Shift &= 15;
if (!ChkRange(Shift, 0 ,16))
break;
}
/* decode destination accumulator */
if (!DecodeAdr(ArgStr[ArgCnt], MModAcc))
break;
DestAcc = *AdrVals;
/* optionally decode source accumulator. If no second accumulator, result
again remains in AdrVals */
if ((ArgCnt == 4) || ((ArgCnt == 3) && (IsAcc(ArgStr[2]))))
{
if (!DecodeAdr(ArgStr[ArgCnt - 1], MModAcc))
break;
}
/* distinguish according to shift count */
if (Shift == 16)
{
WAsmCode[0] = 0xf060 | Index | (DestAcc << 8) | (*AdrVals << 9);
CodeLen = 2;
}
else
{
WAsmCode[0] = 0xf000 | (Index << 5) | (DestAcc << 8) | (*AdrVals << 9) | (Shift & 15);
CodeLen = 2;
}
}
break;
}
}
}
}
static void DecodeMemAcc(Word Index)
{
FixedOrder *POrder = MemAccOrders + Index;
if (ArgCnt != 2) WrError(1110);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else if (DecodeAdr(ArgStr[2], MModAcc))
{
WAsmCode[0] = POrder->Code | (AdrVals[0] << 8);
if (DecodeAdr(ArgStr[1], MModMem))
{
WAsmCode[0] |= *AdrVals;
if (AdrCnt)
WAsmCode[1] = AdrVals[1];
CodeLen = 1 + AdrCnt;
}
}
}
static void DecodeMemConst(Word Index)
{
MemConstOrder *POrder = MemConstOrders + Index;
int HCnt;
if (ArgCnt != 2) WrError(1110);
else if (ThisPar) WrError(1950);
else if ((LastRep) && (!POrder->IsRepeatable)) WrError(1560);
else if (DecodeAdr(ArgStr[2 - POrder->Swap], MModMem))
{
WAsmCode[0] = POrder->Code | 0[AdrVals];
if (((HCnt = AdrCnt)))
WAsmCode[1] = AdrVals[1];
OpSize = POrder->ConstType;
if (DecodeAdr(ArgStr[1 + POrder->Swap], MModImm))
{
WAsmCode[1 + HCnt] = *AdrVals;
CodeLen = 2 + HCnt;
}
}
}
static void DecodeMPY(Word Index)
{
Word DestAcc;
(void)Index;
if ((ArgCnt != 2) && (ArgCnt != 3)) WrError(1110);
else if (DecodeAdr(ArgStr[ArgCnt], MModAcc))
{
DestAcc = (*AdrVals) << 8;
if (ArgCnt == 3)
{
Word XMode;
if (ThisPar) WrError(1950);
else if (DecodeAdr(ArgStr[1], MModMem))
if (MakeXY(&XMode, True))
if (DecodeAdr(ArgStr[2], MModMem))
if (MakeXY(WAsmCode, True))
{
*WAsmCode |= 0xa400 | DestAcc | (XMode << 4);
CodeLen = 1;
}
}
else
{
OpSize = SInt16;
DecodeAdr(ArgStr[1], MModImm | MModMem);
switch (AdrMode)
{
case ModImm:
if (ThisPar) WrError(1950);
else
{
WAsmCode[0] = 0xf066 | DestAcc;
WAsmCode[1] = *AdrVals;
CodeLen = 2;
}
break;
case ModMem:
if (ThisPar)
{
if (MakeXY(AdrVals, True))
{
/* previous op ST src, Ym */
if ((LastOpCode & 0xfe0f) != 0x9a00) WrError(1950);
else
{
RetractWords(1);
*WAsmCode = 0xcc00 | DestAcc | ((LastOpCode & 0x0100) << 1) | ((LastOpCode & 0x00f0) >> 4) | (*AdrVals);
CodeLen = 1;
}
}
}
else
{
WAsmCode[0] = 0x2000 | DestAcc | 0[AdrVals];
if (AdrCnt)
WAsmCode[1] = AdrVals[1];
CodeLen = 1 + AdrCnt;
}
break;
}
}
}
}
static void DecodeMPYA(Word Index)
{
(void) Index;
if (ArgCnt != 1) WrError(1110);
else if (ThisPar) WrError(1950);
else
{
DecodeAdr(ArgStr[1], MModAcc | MModMem);
switch (AdrMode)
{
case ModMem:
WAsmCode[0] = 0x3100 | AdrVals[0];
if (AdrCnt)
WAsmCode[1] = AdrVals[1];
CodeLen = 1 + AdrCnt;
break;
case ModAcc:
WAsmCode[0] = 0xf48c | (*AdrVals << 8);
CodeLen = 1;
break;
}
}
}
static void DecodeSQUR(Word Index)
{
(void)Index;
if (ArgCnt != 2) WrError(1110);
else if (ThisPar) WrError(1950);
else if (DecodeAdr(ArgStr[2], MModAcc))
{
0[WAsmCode] = *AdrVals << 8;
DecodeAdr(ArgStr[1], MModAcc | MModMem);
switch (AdrMode)
{
case ModAcc:
if (*AdrVals) WrError(1350);
else
{
WAsmCode[0] |= 0xf48d;
CodeLen = 1;
}
break;
case ModMem:
WAsmCode[0] |= 0x2600 | *AdrVals;
if (AdrCnt)
WAsmCode[1] = AdrVals[1];
CodeLen = 1 + AdrCnt;
break;
}
}
}
static void DecodeMAC(Word Index)
{
(void) Index;
if ((ArgCnt < 2) || (ArgCnt > 4)) WrError(1110);
else if (DecodeAdr(ArgStr[ArgCnt], MModAcc))
{
*WAsmCode = (*AdrVals) << 8;
OpSize = SInt16;
DecodeAdr(ArgStr[1], MModImm | MModMem);
/* handle syntax 3: immediate op first */
if (AdrMode == ModImm)
{
if (ArgCnt == 4) WrError(1110);
else if (ThisPar) WrError(1950);
else
{
*WAsmCode |= 0xf067; WAsmCode[1] = *AdrVals;
if (ArgCnt == 2)
{
*WAsmCode |= ((*WAsmCode & 0x100) << 1);
CodeLen = 2;
}
else if (DecodeAdr(ArgStr[2], MModAcc))
{
*WAsmCode |= ((*AdrVals) << 9);
CodeLen = 2;
}
}
}
/* syntax 1/2/4 have memory operand in front */
else if (AdrMode == ModMem)
{
/* save [first] memory operand */
Word HMode = *AdrVals, HCnt = AdrCnt;
if (AdrCnt)
WAsmCode[1] = AdrVals[1];
/* syntax 2+4 have at least 3 operands, handle syntax 1 */
if (ArgCnt == 2)
{
if (ThisPar)
{
if (MakeXY(AdrVals, True))
{
if ((LastOpCode & 0xfe0f) == 0x9400) /* previous op LD Xmem, src */
{
if ((LastOpCode & 0x0100) == (*WAsmCode & 0x0100)) WrError(1950);
else
{
RetractWords(1);
*WAsmCode = 0xa800 | (LastOpCode & 0x01f0) | (*AdrVals);
CodeLen = 1;
}
}
else if ((LastOpCode & 0xfe0f) == 0x9a00) /* previous op ST src, Ymem */
{
RetractWords(1);
*WAsmCode |= 0xd000 | ((LastOpCode & 0x0100) << 1) | ((LastOpCode & 0x00f0) >> 4) | (*AdrVals << 4);
CodeLen = 1;
}
else WrError(1950);
}
}
else
{
*WAsmCode |= 0x2800 | HMode;
CodeLen = 1 + AdrCnt;
}
}
else if (ThisPar) WrError(1950);
else
{
/* both syntax 2+4 have optional second accumulator */
if (ArgCnt == 3)
*WAsmCode |= ((*WAsmCode & 0x100) << 1);
else if (DecodeAdr(ArgStr[3], MModAcc))
*WAsmCode |= ((*AdrVals) << 9);
/* if no second accu, AdrMode is still set from previous decode */
if (AdrMode != ModNone)
{
/* differentiate & handle syntax 2 & 4. OpSize still set from above! */
DecodeAdr(ArgStr[2], MModMem | MModImm);
switch (AdrMode)
{
case ModMem:
if (MakeXY(AdrVals, TRUE))
{
WAsmCode[0] |= (*AdrVals);
*AdrVals = HMode;
if (MakeXY(&HMode, TRUE))
{
WAsmCode[0] |= 0xb000 | (HMode << 4);
CodeLen = 1;
}
}
break;
case ModImm:
WAsmCode[1 + HCnt] = *AdrVals;