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1239 lines
38 KiB
1239 lines
38 KiB
//----------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation, 1991-2001.
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//
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//----------------------------------------------------------------------------
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#include "ntsdp.hpp"
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#include "i386_asm.h"
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UCHAR PeekAsmChar(void);
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ULONG PeekAsmToken(PULONG);
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void AcceptAsmToken(void);
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ULONG GetAsmToken(PULONG);
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ULONG NextAsmToken(PULONG);
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ULONG GetAsmReg(PUCHAR, PULONG);
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void GetAsmOperand(PASM_VALUE);
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void GetAsmExpr(PASM_VALUE, UCHAR);
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void GetAsmOrTerm(PASM_VALUE, UCHAR);
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void GetAsmAndTerm(PASM_VALUE, UCHAR);
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void GetAsmNotTerm(PASM_VALUE, UCHAR);
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void GetAsmRelTerm(PASM_VALUE, UCHAR);
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void GetAsmAddTerm(PASM_VALUE, UCHAR);
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void GetAsmMulTerm(PASM_VALUE, UCHAR);
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void GetAsmSignTerm(PASM_VALUE, UCHAR);
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void GetAsmByteTerm(PASM_VALUE, UCHAR);
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void GetAsmOffTerm(PASM_VALUE, UCHAR);
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void GetAsmColnTerm(PASM_VALUE, UCHAR);
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void GetAsmDotTerm(PASM_VALUE, UCHAR);
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void GetAsmIndxTerm(PASM_VALUE, UCHAR);
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void AddAsmValues(PASM_VALUE, PASM_VALUE);
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void SwapPavs(PASM_VALUE, PASM_VALUE);
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extern PUCHAR pchAsmLine;
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struct _AsmRes {
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PCHAR pchRes;
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ULONG valueRes;
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} AsmReserved[] = {
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{ "mod", ASM_MULOP_MOD },
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{ "shl", ASM_MULOP_SHL },
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{ "shr", ASM_MULOP_SHR },
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{ "and", ASM_ANDOP_CLASS },
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{ "not", ASM_NOTOP_CLASS },
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{ "or", ASM_OROP_OR },
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{ "xor", ASM_OROP_XOR },
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{ "eq", ASM_RELOP_EQ },
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{ "ne", ASM_RELOP_NE },
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{ "le", ASM_RELOP_LE },
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{ "lt", ASM_RELOP_LT },
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{ "ge", ASM_RELOP_GE },
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{ "gt", ASM_RELOP_GT },
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{ "by", ASM_UNOP_BY },
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{ "wo", ASM_UNOP_WO },
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{ "dw", ASM_UNOP_DW },
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{ "poi", ASM_UNOP_POI },
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{ "low", ASM_LOWOP_LOW },
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{ "high", ASM_LOWOP_HIGH },
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{ "offset", ASM_OFFOP_CLASS },
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{ "ptr", ASM_PTROP_CLASS },
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{ "byte", ASM_SIZE_BYTE },
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{ "word", ASM_SIZE_WORD },
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{ "dword", ASM_SIZE_DWORD },
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{ "fword", ASM_SIZE_FWORD },
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{ "qword", ASM_SIZE_QWORD },
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{ "tbyte", ASM_SIZE_TBYTE }
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};
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#define RESERVESIZE (sizeof(AsmReserved) / sizeof(struct _AsmRes))
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UCHAR regSize[] = {
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sizeB, // byte
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sizeW, // word
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sizeD, // dword
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sizeW, // segment
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sizeD, // control
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sizeD, // debug
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sizeD, // trace
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sizeT, // float
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sizeT // float with index
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};
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UCHAR regType[] = {
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regG, // byte - general
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regG, // word - general
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regG, // dword - general
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regS, // segment
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regC, // control
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regD, // debug
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regT, // trace
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regF, // float (st)
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regI // float-index (st(n))
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};
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UCHAR tabWordReg[8] = { // rm value
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(UCHAR)-1, // AX - error
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(UCHAR)-1, // CX - error
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(UCHAR)-1, // DX - error
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7, // BX - 111
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(UCHAR)-1, // SP - error
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6, // BP - 110
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4, // SI - 100
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5, // DI - 101
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};
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UCHAR rm16Table[16] = { // new rm left rm right rm
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(UCHAR)-1, // error 100 = [SI] 100 = [SI]
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(UCHAR)-1, // error 100 = [SI] 101 = [DI]
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2, // 010 = [BP+SI] 100 = [SI] 110 = [BP]
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0, // 000 = [BX+SI] 100 = [SI] 111 = [BX]
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(UCHAR)-1, // error 101 = [DI] 100 = [SI]
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(UCHAR)-1, // error 101 = [DI] 101 = [DI]
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3, // 011 = [BP+DI] 101 = [DI] 110 = [BP]
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1, // 001 = [BX+DI] 101 = [DI] 111 = [BX]
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2, // 010 = [BP+SI] 110 = [BP] 100 = [SI]
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3, // 011 = [BP+DI] 110 = [BP] 101 = [DI]
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(UCHAR)-1, // error 110 = [BP] 110 = [BP]
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(UCHAR)-1, // error 110 = [BP] 111 = [BX]
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0, // 000 = [BX+SI] 111 = [BX] 100 = [SI]
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1, // 001 = [BX+DI] 111 = [BX] 101 = [DI]
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(UCHAR)-1, // error 111 = [BX] 110 = [BP]
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(UCHAR)-1 // error 111 = [BX] 111 = [BX]
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};
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PUCHAR savedpchAsmLine;
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ULONG savedAsmClass;
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ULONG savedAsmValue;
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/*** PeekAsmChar - peek the next non-white-space character
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*
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* Purpose:
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* Return the next non-white-space character and update
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* pchAsmLine to point to it.
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*
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* Input:
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* pchAsmLine - present command line position.
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*
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* Returns:
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* next non-white-space character
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*
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*************************************************************************/
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UCHAR PeekAsmChar (void)
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{
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UCHAR ch;
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do
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ch = *pchAsmLine++;
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while (ch == ' ' || ch == '\t');
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pchAsmLine--;
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return ch;
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}
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/*** PeekAsmToken - peek the next command line token
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*
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* Purpose:
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* Return the next command line token, but do not advance
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* the pchAsmLine pointer.
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*
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* Input:
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* pchAsmLine - present command line position.
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*
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* Output:
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* *pvalue - optional value of token
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* Returns:
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* class of token
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*
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* Notes:
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* savedAsmClass, savedAsmValue, and savedpchAsmLine saves the
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* token getting state for future peeks.
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* To get the next token, a GetAsmToken or AcceptAsmToken call
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* must first be made.
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*
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*************************************************************************/
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ULONG PeekAsmToken (PULONG pvalue)
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{
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UCHAR *pchTemp;
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// Get next class and value, but do not
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// move pchAsmLine, but save it in savedpchAsmLine.
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// Do not report any error condition.
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if (savedAsmClass == (ULONG)-1) {
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pchTemp = pchAsmLine;
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savedAsmClass = NextAsmToken(&savedAsmValue);
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savedpchAsmLine = pchAsmLine;
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pchAsmLine = pchTemp;
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}
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*pvalue = savedAsmValue;
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return savedAsmClass;
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}
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/*** AcceptAsmToken - accept any peeked token
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*
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* Purpose:
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* To reset the PeekAsmToken saved variables so the next PeekAsmToken
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* will get the next token in the command line.
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*
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* Input:
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* None.
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*
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* Output:
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* None.
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*
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*************************************************************************/
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void AcceptAsmToken (void)
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{
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savedAsmClass = (ULONG)-1;
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pchAsmLine = savedpchAsmLine;
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}
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/*** GetAsmToken - peek and accept the next token
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*
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* Purpose:
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* Combines the functionality of PeekAsmToken and AcceptAsmToken
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* to return the class and optional value of the next token
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* as well as updating the command pointer pchAsmLine.
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*
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* Input:
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* pchAsmLine - present command string pointer
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*
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* Output:
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* *pvalue - pointer to the token value optionally set.
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* Returns:
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* class of the token read.
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*
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* Notes:
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* An illegal token returns the value of ERROR_CLASS with *pvalue
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* being the error number, but produces no actual error.
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*
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*************************************************************************/
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ULONG GetAsmToken (PULONG pvalue)
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{
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ULONG opclass;
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if (savedAsmClass != (ULONG)-1) {
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opclass = savedAsmClass;
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savedAsmClass = (ULONG)-1;
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*pvalue = savedAsmValue;
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pchAsmLine = savedpchAsmLine;
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}
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else
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opclass = NextAsmToken(pvalue);
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if (opclass == ASM_ERROR_CLASS)
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error(*pvalue);
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return opclass;
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}
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/*** NextAsmToken - process the next token
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*
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* Purpose:
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* Parse the next token from the present command string.
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* After skipping any leading white space, first check for
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* any single character tokens or register variables. If
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* no match, then parse for a number or variable. If a
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* possible variable, check the reserved word list for operators.
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*
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* Input:
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* pchAsmLine - pointer to present command string
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*
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* Output:
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* *pvalue - optional value of token returned
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* pchAsmLine - updated to point past processed token
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* Returns:
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* class of token returned
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*
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* Notes:
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* An illegal token returns the value of ERROR_CLASS with *pvalue
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* being the error number, but produces no actual error.
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*
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*************************************************************************/
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ULONG NextAsmToken (PULONG pvalue)
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{
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ULONG base;
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UCHAR chSymbol[MAX_SYMBOL_LEN];
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UCHAR chPreSym[9];
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ULONG cbSymbol = 0;
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UCHAR fNumber = TRUE;
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UCHAR fSymbol = TRUE;
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UCHAR fForceReg = FALSE;
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ULONG errNumber = 0;
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UCHAR ch;
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UCHAR chlow;
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UCHAR chtemp;
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UCHAR limit1 = '9';
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UCHAR limit2 = '9';
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UCHAR fDigit = FALSE;
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ULONG value = 0;
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ULONG tmpvalue;
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ULONG index;
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PDEBUG_IMAGE_INFO pImage;
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ULONG64 value64;
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base = g_DefaultRadix;
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// skip leading white space
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ch = PeekAsmChar();
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chlow = (UCHAR)tolower(ch);
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pchAsmLine++;
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// test for special character operators and register variable
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switch (chlow) {
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case '\0':
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pchAsmLine--;
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return ASM_EOL_CLASS;
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case ',':
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return ASM_COMMA_CLASS;
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case '+':
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*pvalue = ASM_ADDOP_PLUS;
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return ASM_ADDOP_CLASS;
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case '-':
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*pvalue = ASM_ADDOP_MINUS;
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return ASM_ADDOP_CLASS;
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case '*':
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*pvalue = ASM_MULOP_MULT;
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return ASM_MULOP_CLASS;
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case '/':
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*pvalue = ASM_MULOP_DIVIDE;
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return ASM_MULOP_CLASS;
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case ':':
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return ASM_COLNOP_CLASS;
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case '(':
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return ASM_LPAREN_CLASS;
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case ')':
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return ASM_RPAREN_CLASS;
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case '[':
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return ASM_LBRACK_CLASS;
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case ']':
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return ASM_RBRACK_CLASS;
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case '@':
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fForceReg = TRUE;
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chlow = (UCHAR)tolower(*pchAsmLine); pchAsmLine++;
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break;
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case '.':
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return ASM_DOTOP_CLASS;
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case '\'':
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for (index = 0; index < 5; index++) {
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ch = *pchAsmLine++;
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if (ch == '\'' || ch == '\0')
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break;
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value = (value << 8) + (ULONG)ch;
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}
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if (ch == '\0' || index == 0 || index == 5) {
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pchAsmLine--;
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*pvalue = SYNTAX;
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return ASM_ERROR_CLASS;
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}
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pchAsmLine++;
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*pvalue = value;
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return ASM_NUMBER_CLASS;
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}
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// if first character is a decimal digit, it cannot
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// be a symbol. leading '0' implies octal, except
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// a leading '0x' implies hexadecimal.
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if (chlow >= '0' && chlow <= '9') {
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if (fForceReg) {
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*pvalue = SYNTAX;
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return ASM_ERROR_CLASS;
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}
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fSymbol = FALSE;
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if (chlow == '0') {
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ch = *pchAsmLine++;
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chlow = (UCHAR)tolower(ch);
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if (chlow == 'x') {
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base = 16;
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ch = *pchAsmLine++;
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chlow = (UCHAR)tolower(ch);
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}
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else if (chlow == 'n') {
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base = 10;
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ch = *pchAsmLine++;
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chlow = (UCHAR)tolower(ch);
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}
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else {
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base = 8;
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fDigit = TRUE;
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}
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}
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}
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// a number can start with a letter only if base is
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// hexadecimal and it is a hexadecimal digit 'a'-'f'.
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else if ((chlow < 'a' && chlow > 'f') || base != 16)
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fNumber = FALSE;
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// set limit characters for the appropriate base.
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if (base == 8)
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limit1 = '7';
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if (base == 16)
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limit2 = 'f';
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// perform processing while character is a letter,
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// digit, or underscore.
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while ((chlow >= 'a' && chlow <= 'z') ||
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(chlow >= '0' && chlow <= '9') || (chlow == '_')) {
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// if possible number, test if within proper range,
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// and if so, accumulate sum.
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if (fNumber) {
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if ((chlow >= '0' && chlow <= limit1) ||
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(chlow >= 'a' && chlow <= limit2)) {
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fDigit = TRUE;
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tmpvalue = value * base;
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if (tmpvalue < value)
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errNumber = OVERFLOW;
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chtemp = (UCHAR)(chlow - '0');
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if (chtemp > 9)
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chtemp -= 'a' - '0' - 10;
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value = tmpvalue + (ULONG)chtemp;
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if (value < tmpvalue)
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errNumber = OVERFLOW;
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}
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else {
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fNumber = FALSE;
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errNumber = SYNTAX;
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}
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}
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if (fSymbol) {
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if (cbSymbol < 9)
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chPreSym[cbSymbol] = chlow;
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if (cbSymbol < MAX_SYMBOL_LEN - 1)
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chSymbol[cbSymbol++] = ch;
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}
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ch = *pchAsmLine++;
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chlow = (UCHAR)tolower(ch);
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}
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// back up pointer to first character after token.
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pchAsmLine--;
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if (cbSymbol < 9)
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chPreSym[cbSymbol] = '\0';
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// if fForceReg, check for register name and return
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// success or failure
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if (fForceReg)
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if ((index = GetAsmReg(chPreSym, pvalue)) != 0) {
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if (index == ASM_REG_SEGMENT)
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if (PeekAsmChar() == ':') {
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pchAsmLine++;
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index = ASM_SEGOVR_CLASS;
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}
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return index; // class type returned by GetAsmReg
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}
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else {
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*pvalue = BADREG;
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return ASM_ERROR_CLASS;
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}
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// next test for reserved word and symbol string
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if (fSymbol) {
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// if possible symbol, check lowercase string in chPreSym
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// for text operator or register name.
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// otherwise, return symbol value from name in chSymbol.
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for (index = 0; index < RESERVESIZE; index++)
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if (!strcmp((PSTR)chPreSym, AsmReserved[index].pchRes)) {
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*pvalue = AsmReserved[index].valueRes;
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return AsmReserved[index].valueRes & ASM_CLASS_MASK;
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}
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// start processing string as symbol
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chSymbol[cbSymbol] = '\0';
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// test if symbol is a module name (with '!' after it)
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// if so, get next token and treat as symbol
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pImage = GetImageByName(g_CurrentProcess, (PSTR)chSymbol,
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INAME_MODULE);
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if (pImage && (ch = PeekAsmChar()) == '!') {
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pchAsmLine++;
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ch = PeekAsmChar();
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pchAsmLine++;
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cbSymbol = 0;
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while ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') ||
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(ch >= '0' && ch <= '9') || (ch == '_')) {
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chSymbol[cbSymbol++] = ch;
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ch = *pchAsmLine++;
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}
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chSymbol[cbSymbol] = '\0';
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pchAsmLine--;
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}
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if (GetOffsetFromSym((PSTR)chSymbol, &value64, NULL)) {
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*pvalue = (ULONG)value64;
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return ASM_SYMBOL_CLASS;
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}
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// symbol is undefined.
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// if a possible hex number, do not set the error type
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if (!fNumber)
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errNumber = VARDEF;
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}
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// if possible number and no error, return the number
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if (fNumber && !errNumber) {
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if (fDigit) {
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// check for possible segment specification
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// "<16-bit number>:"
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if (PeekAsmChar() == ':') {
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pchAsmLine++;
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if (value > 0xffff)
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error(BADSEG);
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*pvalue = value;
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return ASM_SEGMENT_CLASS;
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}
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*pvalue = value;
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return ASM_NUMBER_CLASS;
|
|
}
|
|
else
|
|
errNumber = SYNTAX;
|
|
}
|
|
|
|
// last chance, undefined symbol and illegal number,
|
|
// so test for register, will handle old format
|
|
|
|
if ((index = GetAsmReg(chPreSym, pvalue)) != 0) {
|
|
if (index == ASM_REG_SEGMENT)
|
|
if (PeekAsmChar() == ':') {
|
|
pchAsmLine++;
|
|
index = ASM_SEGOVR_CLASS;
|
|
}
|
|
return index; // class type returned by GetAsmReg
|
|
}
|
|
|
|
*pvalue = (ULONG) errNumber;
|
|
return ASM_ERROR_CLASS;
|
|
}
|
|
|
|
ULONG GetAsmReg (PUCHAR pSymbol, PULONG pValue)
|
|
{
|
|
static UCHAR vRegList[] = "axcxdxbxspbpsidi";
|
|
static UCHAR bRegList[] = "alcldlblahchdhbh";
|
|
static UCHAR sRegList[] = "ecsdfg"; // second char is 's'
|
|
// same order as seg enum
|
|
|
|
ULONG index;
|
|
UCHAR ch0 = *pSymbol;
|
|
UCHAR ch1 = *(pSymbol + 1);
|
|
UCHAR ch2 = *(pSymbol + 2);
|
|
UCHAR ch3 = *(pSymbol + 3);
|
|
|
|
// only test strings with two or three characters
|
|
|
|
if (ch0 && ch1) {
|
|
if (ch2 == '\0') {
|
|
|
|
// symbol has two characters, first test for 16-bit register
|
|
|
|
for (index = 0; index < 8; index++)
|
|
if (*(PUSHORT)pSymbol == *((PUSHORT)vRegList + index)) {
|
|
*pValue = index;
|
|
return ASM_REG_WORD;
|
|
}
|
|
|
|
// next test for 8-bit register
|
|
|
|
for (index = 0; index < 8; index++)
|
|
if (*(PUSHORT)pSymbol == *((PUSHORT)bRegList + index)) {
|
|
*pValue = index;
|
|
return ASM_REG_BYTE;
|
|
}
|
|
|
|
// test for segment register
|
|
|
|
if (ch1 == 's')
|
|
for (index = 0; index < 6; index++)
|
|
if (ch0 == *(sRegList + index)) {
|
|
*pValue = index + 1; // list offset is 1
|
|
return ASM_REG_SEGMENT;
|
|
}
|
|
|
|
// finally test for floating register "st" or "st(n)"
|
|
// parse the arg here as '(', <octal value>, ')'
|
|
// return value for "st" is REG_FLOAT,
|
|
// for "st(n)" is REG_INDFLT with value 0-7
|
|
|
|
if (ch0 == 's' && ch1 == 't') {
|
|
if (PeekAsmChar() != '(')
|
|
return ASM_REG_FLOAT;
|
|
else {
|
|
pchAsmLine++;
|
|
index = (ULONG)(PeekAsmChar() - '0');
|
|
if (index < 8) {
|
|
pchAsmLine++;
|
|
if (PeekAsmChar() == ')') {
|
|
pchAsmLine++;
|
|
*pValue = index;
|
|
return ASM_REG_INDFLT;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (ch3 == '\0') {
|
|
|
|
// if three-letter symbol, test for leading 'e' and
|
|
// second and third character being in the 16-bit list
|
|
|
|
if (ch0 == 'e') {
|
|
for (index = 0; index < 8; index++)
|
|
if (*(UNALIGNED USHORT *)(pSymbol + 1) ==
|
|
*((PUSHORT)vRegList + index)) {
|
|
*pValue = index;
|
|
return ASM_REG_DWORD;
|
|
}
|
|
}
|
|
|
|
// test for control, debug, and test registers
|
|
|
|
else if (ch1 == 'r') {
|
|
ch2 -= '0';
|
|
*pValue = ch2;
|
|
|
|
// legal control registers are CR0, CR2, CR3, CR4
|
|
|
|
if (ch0 == 'c') {
|
|
if (ch2 >= 0 && ch2 <= 4)
|
|
return ASM_REG_CONTROL;
|
|
}
|
|
|
|
// legal debug registers are DR0 - DR3, DR6, DR7
|
|
|
|
else if (ch0 == 'd') {
|
|
if (ch2 <= 3 || ch2 == 6 || ch2 == 7)
|
|
return ASM_REG_DEBUG;
|
|
}
|
|
|
|
// legal trace registers are TR3 - TR7
|
|
|
|
else if (ch0 == 't') {
|
|
if (ch2 >= 3 && ch2 <= 7)
|
|
return ASM_REG_TRACE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Operand parser - recursive descent
|
|
//
|
|
// Grammar productions:
|
|
//
|
|
// <Operand> ::= <register> | <Expr>
|
|
// <Expr> ::= <orTerm> [(XOR | OR) <orTerm>]*
|
|
// <orTerm> ::= <andTerm> [AND <andTerm>]*
|
|
// <andTerm> ::= [NOT]* <notTerm>
|
|
// <notTerm> ::= <relTerm> [(EQ | NE | GE | GT | LE | LT) <relTerm>]*
|
|
// <relTerm> ::= <addTerm> [(- | +) <addTerm>]*
|
|
// <addTerm> ::= <mulTerm> [(* | / | MOD | SHL | SHR) <mulTerm>]*
|
|
// <mulTerm> ::= [(- | +)]* <signTerm>
|
|
// <signTerm> ::= [(HIGH | LOW)]* <byteTerm>
|
|
// <byteTerm> ::= [(OFFSET | <type> PTR)]* <offTerm>
|
|
// <offTerm> ::= [<segovr>] <colnTerm>
|
|
// <colnTerm> ::= <dotTerm> [.<dotTerm>]*
|
|
// <dotTerm> ::= <indxTerm> ['['<Expr>']']*
|
|
// <indxTerm> ::= <index-reg> | <symbol> | <number> | '('<Expr>')'
|
|
// | '['<Expr>']'
|
|
|
|
// <Operand> ::= <register> | <Expr>
|
|
|
|
void GetAsmOperand (PASM_VALUE pavExpr)
|
|
{
|
|
ULONG tokenvalue;
|
|
ULONG classvalue;
|
|
|
|
classvalue = PeekAsmToken(&tokenvalue);
|
|
if ((classvalue & ASM_CLASS_MASK) == ASM_REG_CLASS) {
|
|
AcceptAsmToken();
|
|
classvalue &= ASM_TYPE_MASK;
|
|
pavExpr->flags = fREG;
|
|
pavExpr->base = (UCHAR)tokenvalue; // index within reg group
|
|
pavExpr->index = regType[classvalue - 1];
|
|
pavExpr->size = regSize[classvalue - 1];
|
|
}
|
|
else {
|
|
GetAsmExpr(pavExpr, FALSE);
|
|
if (pavExpr->reloc > 1) // only 0 and 1 are allowed
|
|
error(OPERAND);
|
|
}
|
|
}
|
|
|
|
// <Expr> ::= <orTerm> [(XOR | OR) <orTerm>]*
|
|
|
|
void GetAsmExpr (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ASM_VALUE avTerm;
|
|
|
|
dprintf("enter GetAsmExpr\n");
|
|
GetAsmOrTerm(pavValue, fBracket);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_OROP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmOrTerm(&avTerm, fBracket);
|
|
if (!(pavValue->flags & avTerm.flags & fIMM))
|
|
error(OPERAND);
|
|
if (tokenvalue == ASM_OROP_OR)
|
|
pavValue->value |= avTerm.value;
|
|
else
|
|
pavValue->value ^= avTerm.value;
|
|
}
|
|
dprintf("exit GetAsmExpr with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <orTerm> ::= <andTerm> [AND <andTerm>]*
|
|
|
|
void GetAsmOrTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ASM_VALUE avTerm;
|
|
|
|
dprintf("enter GetAsmOrTerm\n");
|
|
GetAsmAndTerm(pavValue, fBracket);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_ANDOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmAndTerm(&avTerm, fBracket);
|
|
if (!(pavValue->flags & avTerm.flags & fIMM))
|
|
error(OPERAND);
|
|
pavValue->value &= avTerm.value;
|
|
}
|
|
dprintf("exit GetAsmOrTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <andTerm> ::= [NOT]* <notTerm>
|
|
|
|
void GetAsmAndTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
|
|
dprintf("enter GetAsmAndTerm\n");
|
|
if (PeekAsmToken(&tokenvalue) == ASM_NOTOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmAndTerm(pavValue, fBracket);
|
|
if (!(pavValue->flags & fIMM))
|
|
error(OPERAND);
|
|
pavValue->value = ~pavValue->value;
|
|
}
|
|
else
|
|
GetAsmNotTerm(pavValue, fBracket);
|
|
dprintf("exit GetAsmAndTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <notTerm> ::= <relTerm> [(EQ | NE | GE | GT | LE | LT) <relTerm>]*
|
|
|
|
void GetAsmNotTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ULONG fTest;
|
|
ULONG fAddress;
|
|
ASM_VALUE avTerm;
|
|
|
|
dprintf("enter GetAsmNotTerm\n");
|
|
GetAsmRelTerm(pavValue, fBracket);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_RELOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmRelTerm(&avTerm, fBracket);
|
|
if (!(pavValue->flags & avTerm.flags & fIMM) ||
|
|
pavValue->reloc > 1 || avTerm.reloc > 1)
|
|
error(OPERAND);
|
|
fAddress = pavValue->reloc | avTerm.reloc;
|
|
switch (tokenvalue) {
|
|
case ASM_RELOP_EQ:
|
|
fTest = pavValue->value == avTerm.value;
|
|
break;
|
|
case ASM_RELOP_NE:
|
|
fTest = pavValue->value != avTerm.value;
|
|
break;
|
|
case ASM_RELOP_GE:
|
|
if (fAddress)
|
|
fTest = pavValue->value >= avTerm.value;
|
|
else
|
|
fTest = (LONG)pavValue->value >= (LONG)avTerm.value;
|
|
break;
|
|
case ASM_RELOP_GT:
|
|
if (fAddress)
|
|
fTest = pavValue->value > avTerm.value;
|
|
else
|
|
fTest = (LONG)pavValue->value > (LONG)avTerm.value;
|
|
break;
|
|
case ASM_RELOP_LE:
|
|
if (fAddress)
|
|
fTest = pavValue->value <= avTerm.value;
|
|
else
|
|
fTest = (LONG)pavValue->value <= (LONG)avTerm.value;
|
|
break;
|
|
case ASM_RELOP_LT:
|
|
if (fAddress)
|
|
fTest = pavValue->value < avTerm.value;
|
|
else
|
|
fTest = (LONG)pavValue->value < (LONG)avTerm.value;
|
|
break;
|
|
default:
|
|
printf("bad RELOP type\n");
|
|
}
|
|
pavValue->value = (ULONG)(-((LONG)fTest)); // FALSE = 0; TRUE = -1
|
|
pavValue->reloc = 0;
|
|
pavValue->size = sizeB; // immediate value is byte
|
|
}
|
|
dprintf("exit GetAsmNotTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <relTerm> ::= <addTerm> [(- | +) <addTerm>]*
|
|
|
|
void GetAsmRelTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ASM_VALUE avTerm;
|
|
|
|
dprintf("enter GetAsmRelTerm\n");
|
|
GetAsmAddTerm(pavValue, fBracket);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_ADDOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmAddTerm(&avTerm, fBracket);
|
|
if (tokenvalue == ASM_ADDOP_MINUS) {
|
|
if (!(avTerm.flags & (fIMM | fPTR)))
|
|
error(OPERAND);
|
|
avTerm.value = (ULONG)(-((LONG)avTerm.value));
|
|
avTerm.reloc = (UCHAR)(-avTerm.reloc);
|
|
}
|
|
AddAsmValues(pavValue, &avTerm);
|
|
}
|
|
dprintf("exit GetAsmRelTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <addTerm> ::= <mulTerm> [(* | / | MOD | SHL | SHR) <mulTerm>]*
|
|
|
|
void GetAsmAddTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ASM_VALUE avTerm;
|
|
|
|
dprintf("enter GetAsmAddTerm\n");
|
|
GetAsmMulTerm(pavValue, fBracket);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_MULOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmMulTerm(&avTerm, fBracket);
|
|
|
|
if (tokenvalue == ASM_MULOP_MULT) {
|
|
if (pavValue->flags & fIMM)
|
|
SwapPavs(pavValue, &avTerm);
|
|
if (!(avTerm.flags & fIMM))
|
|
error(OPERAND);
|
|
if (pavValue->flags & fIMM)
|
|
pavValue->value *= avTerm.value;
|
|
else if ((pavValue->flags & fPTR32)
|
|
&& pavValue->value == 0
|
|
&& pavValue->base != indSP
|
|
&& pavValue->index == 0xff) {
|
|
pavValue->index = pavValue->base;
|
|
pavValue->base = 0xff;
|
|
pavValue->scale = 0xff;
|
|
if (avTerm.value == 1)
|
|
pavValue->scale = 0;
|
|
if (avTerm.value == 2)
|
|
pavValue->scale = 1;
|
|
if (avTerm.value == 4)
|
|
pavValue->scale = 2;
|
|
if (avTerm.value == 8)
|
|
pavValue->scale = 3;
|
|
if (pavValue->scale == 0xff)
|
|
error(OPERAND);
|
|
}
|
|
else
|
|
error(OPERAND);
|
|
}
|
|
else if (!(pavValue->flags & avTerm.flags & fIMM))
|
|
error(OPERAND);
|
|
else if (tokenvalue == ASM_MULOP_DIVIDE
|
|
|| tokenvalue == ASM_MULOP_MOD) {
|
|
if (avTerm.value == 0)
|
|
error(DIVIDE);
|
|
if (tokenvalue == ASM_MULOP_DIVIDE)
|
|
pavValue->value /= avTerm.value;
|
|
else
|
|
pavValue->value %= avTerm.value;
|
|
}
|
|
else if (tokenvalue == ASM_MULOP_SHL)
|
|
pavValue->value <<= avTerm.value;
|
|
else
|
|
pavValue->value >>= avTerm.value;
|
|
}
|
|
dprintf("exit GetAsmAddTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <mulTerm> ::= [(- | +)]* <signTerm>
|
|
|
|
void GetAsmMulTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
|
|
dprintf("enter GetAsmMulTerm\n");
|
|
if (PeekAsmToken(&tokenvalue) == ASM_ADDOP_CLASS) { // BY WO DW POI UNDN
|
|
AcceptAsmToken();
|
|
GetAsmMulTerm(pavValue, fBracket);
|
|
if (tokenvalue == ASM_ADDOP_MINUS) {
|
|
if (!(pavValue->flags & (fIMM | fPTR)))
|
|
error(OPERAND);
|
|
pavValue->value = (ULONG)(-((LONG)pavValue->value));
|
|
pavValue->reloc = (UCHAR)(-pavValue->reloc);
|
|
}
|
|
}
|
|
else
|
|
GetAsmSignTerm(pavValue, fBracket);
|
|
dprintf("exit GetAsmMulTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <signTerm> ::= [(HIGH | LOW)]* <byteTerm>
|
|
|
|
void GetAsmSignTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
|
|
dprintf("enter GetAsmSignTerm\n");
|
|
if (PeekAsmToken(&tokenvalue) == ASM_LOWOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmSignTerm(pavValue, fBracket);
|
|
if (!(pavValue->flags & (fIMM | fPTR)))
|
|
error(OPERAND);
|
|
if (tokenvalue == ASM_LOWOP_LOW)
|
|
pavValue->value = pavValue->value & 0xff;
|
|
else
|
|
pavValue->value = (pavValue->value & ~0xff) >> 8;
|
|
pavValue->flags = fIMM; // make an immediate value
|
|
pavValue->reloc = 0;
|
|
pavValue->segment = segX;
|
|
pavValue->size = sizeB; // byte value
|
|
}
|
|
else
|
|
GetAsmByteTerm(pavValue, fBracket);
|
|
dprintf("exit GetAsmSignTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <byteTerm> ::= [(OFFSET | <size> PTR)]* <offTerm>
|
|
|
|
void GetAsmByteTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ULONG classvalue;
|
|
|
|
dprintf("enter GetAsmByteTerm\n");
|
|
classvalue = PeekAsmToken(&tokenvalue);
|
|
if (classvalue == ASM_OFFOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmByteTerm(pavValue, fBracket);
|
|
if (!(pavValue->flags & (fIMM | fPTR)) || pavValue->reloc > 1)
|
|
error(OPERAND);
|
|
pavValue->flags = fIMM; // make offset an immediate value
|
|
pavValue->reloc = 0;
|
|
pavValue->size = sizeX;
|
|
pavValue->segment = segX;
|
|
}
|
|
else if (classvalue == ASM_SIZE_CLASS) {
|
|
AcceptAsmToken();
|
|
if (GetAsmToken(&classvalue) != ASM_PTROP_CLASS) // dummy token
|
|
error(SYNTAX);
|
|
GetAsmByteTerm(pavValue, fBracket);
|
|
if (!(pavValue->flags & (fIMM | fPTR | fPTR16 | fPTR32))
|
|
|| pavValue->reloc > 1
|
|
|| pavValue->size != sizeX)
|
|
error(OPERAND);
|
|
pavValue->reloc = 1; // make ptr a relocatable value
|
|
if (pavValue->flags & fIMM)
|
|
pavValue->flags = fPTR;
|
|
pavValue->size = (UCHAR)(tokenvalue & ASM_TYPE_MASK);
|
|
// value has "size?"
|
|
}
|
|
else
|
|
GetAsmOffTerm(pavValue, fBracket);
|
|
dprintf("exit GetAsmByteTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <offTerm> ::= [<segovr>] <colnTerm>
|
|
|
|
void GetAsmOffTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG classvalue;
|
|
ULONG tokenvalue;
|
|
|
|
dprintf("enter GetAsmOffTerm\n");
|
|
classvalue = PeekAsmToken(&tokenvalue);
|
|
if (classvalue == ASM_SEGOVR_CLASS || classvalue == ASM_SEGMENT_CLASS) {
|
|
if (fBracket)
|
|
error(SYNTAX);
|
|
AcceptAsmToken();
|
|
}
|
|
GetAsmColnTerm(pavValue, fBracket);
|
|
if (classvalue == ASM_SEGOVR_CLASS) {
|
|
if (pavValue->reloc > 1 || pavValue->segovr != segX)
|
|
error(OPERAND);
|
|
pavValue->reloc = 1; // make ptr a relocatable value
|
|
if (pavValue->flags & fIMM)
|
|
pavValue->flags = fPTR;
|
|
pavValue->segovr = (UCHAR)tokenvalue; // has segment override
|
|
}
|
|
else if (classvalue == ASM_SEGMENT_CLASS) {
|
|
if (!(pavValue->flags & fIMM) || pavValue->reloc > 1)
|
|
error(OPERAND);
|
|
pavValue->segment = (USHORT)tokenvalue; // segment has segment value
|
|
pavValue->flags = fFPTR; // set flag for far pointer
|
|
}
|
|
dprintf("exit GetAsmOffTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <colnTerm> ::= <dotTerm> [.<dotTerm>]*
|
|
|
|
void GetAsmColnTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ASM_VALUE avTerm;
|
|
|
|
dprintf("enter GetAsmColnTerm\n");
|
|
GetAsmDotTerm(pavValue, fBracket);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_DOTOP_CLASS) {
|
|
AcceptAsmToken();
|
|
GetAsmDotTerm(&avTerm, fBracket);
|
|
AddAsmValues(pavValue, &avTerm);
|
|
}
|
|
dprintf("exit GetAsmColnTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <dotTerm> ::= <indxTerm> ['['<Expr>']']*
|
|
|
|
void GetAsmDotTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ASM_VALUE avExpr;
|
|
|
|
dprintf("enter GetAsmDotTerm\n");
|
|
GetAsmIndxTerm(pavValue, fBracket);
|
|
if (pavValue->reloc > 1)
|
|
error(OPERAND);
|
|
while (PeekAsmToken(&tokenvalue) == ASM_LBRACK_CLASS) {
|
|
AcceptAsmToken();
|
|
if (fBracket)
|
|
error(SYNTAX);
|
|
GetAsmExpr(&avExpr, TRUE);
|
|
AddAsmValues(pavValue, &avExpr);
|
|
if (GetAsmToken(&tokenvalue) != ASM_RBRACK_CLASS)
|
|
error(SYNTAX);
|
|
if (pavValue->flags & fIMM)
|
|
pavValue->flags = fPTR;
|
|
}
|
|
dprintf("exit GetAsmDotTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
// <indxTerm> ::= <index-reg> | <symbol> | <number> | '('<Expr>')'
|
|
// | '['<Expr>']'
|
|
|
|
void GetAsmIndxTerm (PASM_VALUE pavValue, UCHAR fBracket)
|
|
{
|
|
ULONG tokenvalue;
|
|
ULONG classvalue;
|
|
|
|
dprintf("enter GetAsmIndxTerm\n");
|
|
classvalue = GetAsmToken(&tokenvalue);
|
|
pavValue->segovr = segX;
|
|
pavValue->size = sizeX;
|
|
pavValue->reloc = 0;
|
|
pavValue->value = 0;
|
|
if (classvalue == ASM_LPAREN_CLASS) {
|
|
GetAsmExpr(pavValue, fBracket);
|
|
if (GetAsmToken(&tokenvalue) != ASM_RPAREN_CLASS)
|
|
error(SYNTAX);
|
|
}
|
|
else if (classvalue == ASM_LBRACK_CLASS) {
|
|
if (fBracket)
|
|
error(SYNTAX);
|
|
GetAsmExpr(pavValue, TRUE);
|
|
if (GetAsmToken(&tokenvalue) != ASM_RBRACK_CLASS)
|
|
error(SYNTAX);
|
|
if (pavValue->flags == fIMM)
|
|
pavValue->flags = fPTR;
|
|
}
|
|
else if (classvalue == ASM_SYMBOL_CLASS) {
|
|
pavValue->value = tokenvalue;
|
|
pavValue->flags = fIMM;
|
|
pavValue->reloc = 1;
|
|
}
|
|
else if (classvalue == ASM_NUMBER_CLASS) {
|
|
pavValue->value = tokenvalue;
|
|
pavValue->flags = fIMM;
|
|
}
|
|
else if (classvalue == ASM_REG_WORD) {
|
|
if (!fBracket)
|
|
error(SYNTAX);
|
|
pavValue->flags = fPTR16;
|
|
pavValue->base = tabWordReg[tokenvalue];
|
|
if (pavValue->base == 0xff)
|
|
error(OPERAND);
|
|
}
|
|
else if (classvalue == ASM_REG_DWORD) {
|
|
if (!fBracket)
|
|
error(SYNTAX);
|
|
pavValue->flags = fPTR32;
|
|
pavValue->base = (UCHAR)tokenvalue;
|
|
pavValue->index = 0xff;
|
|
}
|
|
else
|
|
error(SYNTAX);
|
|
dprintf("exit GetAsmIndxTerm with %lx\n", pavValue->value);
|
|
}
|
|
|
|
void AddAsmValues (PASM_VALUE pavLeft, PASM_VALUE pavRight)
|
|
{
|
|
// swap values if left one is a pointer
|
|
|
|
if (pavLeft->flags & fPTR)
|
|
SwapPavs(pavLeft, pavRight);
|
|
|
|
// swap values if left one is an immediate
|
|
|
|
if (pavLeft->flags & fIMM)
|
|
SwapPavs(pavLeft, pavRight);
|
|
|
|
// the above swaps reduce the cases to test.
|
|
// pairs with an immediate will have it on the right
|
|
// pairs with a pointer will have it on the right,
|
|
// except for a pointer-immediate pair
|
|
|
|
// if both values are 16-bit pointers, combine them
|
|
|
|
if (pavLeft->flags & pavRight->flags & fPTR16) {
|
|
|
|
// if either side has both registers (rm < 4), error
|
|
|
|
if (!(pavLeft->base & pavRight->base & 4))
|
|
error(OPERAND);
|
|
|
|
// use lookup table to compute new rm value
|
|
|
|
pavLeft->base = rm16Table[((pavLeft->base & 3) << 2) +
|
|
(pavRight->base & 3)];
|
|
if (pavLeft->base == 0xff)
|
|
error(OPERAND);
|
|
|
|
pavRight->flags = fPTR;
|
|
}
|
|
|
|
// if both values are 32-bit pointers, combine them
|
|
|
|
if (pavLeft->flags & pavRight->flags & fPTR32) {
|
|
|
|
// error if either side has both base and index,
|
|
// or if both have index
|
|
|
|
if (((pavLeft->base | pavLeft->index) != 0xff)
|
|
|| ((pavRight->base | pavRight->index) != 0xff)
|
|
|| ((pavLeft->index | pavRight->index) != 0xff))
|
|
error(OPERAND);
|
|
|
|
// if left side has base, swap sides
|
|
|
|
if (pavLeft->base != 0xff)
|
|
SwapPavs(pavLeft, pavRight);
|
|
|
|
// two cases remaining, index-base and base-base
|
|
|
|
if (pavLeft->base != 0xff) {
|
|
|
|
// left side has base, promote to index but swap if left
|
|
// base is ESP since it cannot be an index register
|
|
|
|
if (pavLeft->base == indSP)
|
|
SwapPavs(pavLeft, pavRight);
|
|
if (pavLeft->base == indSP)
|
|
error(OPERAND);
|
|
pavLeft->index = pavLeft->base;
|
|
pavLeft->scale = 0;
|
|
}
|
|
|
|
// finish by setting left side base to right side value
|
|
|
|
pavLeft->base = pavRight->base;
|
|
|
|
pavRight->flags = fPTR;
|
|
}
|
|
|
|
// if left side is any pointer and right is nonindex pointer,
|
|
// combine them. (above cases set right side to use this code)
|
|
|
|
if ((pavLeft->flags & (fPTR | fPTR16 | fPTR32))
|
|
&& (pavRight->flags & fPTR)) {
|
|
if (pavLeft->segovr + pavRight->segovr != segX
|
|
&& pavLeft->segovr != pavRight->segovr)
|
|
error(OPERAND);
|
|
if (pavLeft->size + pavRight->size != sizeX
|
|
&& pavLeft->size != pavRight->size)
|
|
error(OPERAND);
|
|
pavRight->flags = fIMM;
|
|
}
|
|
|
|
// if right side is immediate, add values and relocs
|
|
// (above case sets right side to use this code)
|
|
// illegal value types do not have right side set to fIMM
|
|
|
|
if (pavRight->flags & fIMM) {
|
|
pavLeft->value += pavRight->value;
|
|
pavLeft->reloc += pavRight->reloc;
|
|
}
|
|
else
|
|
error(OPERAND);
|
|
}
|
|
|
|
void SwapPavs (PASM_VALUE pavFirst, PASM_VALUE pavSecond)
|
|
{
|
|
ASM_VALUE temp;
|
|
|
|
memmove(&temp, pavFirst, sizeof(ASM_VALUE));
|
|
memmove(pavFirst, pavSecond, sizeof(ASM_VALUE));
|
|
memmove(pavSecond, &temp, sizeof(ASM_VALUE));
|
|
}
|