397 lines
8.7 KiB
PHP
397 lines
8.7 KiB
PHP
;-----------------------------------------------------------------------------
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TokenEnd = 1
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TokenReg = 2
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TokenHex = 3
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TokenOr = 4
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TokenAnd = 5
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TokenXor = 6
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TokenAdd = 7
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TokenSub = 8
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TokenMul = 9
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TokenDiv = 10
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TokenLP = 11
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TokenRP = 12
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TokenErr = -1
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;-----------------------------------------------------------------------------
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RegTable:
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db 2,'al',0
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db 2,'cl',1
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db 2,'dl',2
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db 2,'bl',3
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db 2,'ah',4
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db 2,'ch',5
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db 2,'dh',6
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db 2,'bh',7
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db 2,'ax',8
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db 2,'cx',9
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db 2,'dx',10
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db 2,'bx',11
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db 2,'sp',12
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db 2,'bp',13
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db 2,'si',14
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db 2,'di',15
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db 3,'eax',16
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db 3,'ecx',17
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db 3,'edx',18
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db 3,'ebx',19
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db 3,'esp',20
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db 3,'ebp',21
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db 3,'esi',22
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db 3,'edi',23
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db 3,'eip',24
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db 0
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;-----------------------------------------------------------------------------
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; Check if byte is hex digit
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IsHexDigit:
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cmp al,'0'
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jb .No
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cmp al,'9'
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jbe .09
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cmp al,'A'
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jb .No
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cmp al,'F'
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jbe .AF
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cmp al,'a'
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jb .No
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cmp al,'f'
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jbe .FA
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.No:
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stc
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ret
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.09:
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sub al,'0'
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; clc
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ret
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.AF:
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sub al,'A'-10
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; clc
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ret
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.FA:
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sub al,'a'-10
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; clc
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ret
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;-----------------------------------------------------------------------------
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; Find register in the table
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FindReg:
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mov edi,RegTable
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.FindReg:
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movzx ecx,byte [edi]
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stc
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jecxz .RegNotFound
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inc edi
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push esi edi ecx
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@@:
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lodsb
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or al,20h
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scasb
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loopz @B
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pop ecx edi esi
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lea edi,[edi+ecx+1]
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jnz .FindReg
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movzx edi,byte [edi-1]
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add esi,ecx
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.RegNotFound:
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ret
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;-----------------------------------------------------------------------------
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; Tokenize expressions
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ExprGetToken:
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lodsb
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cmp al,0
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jz .EndToken
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cmp al,' '
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jbe ExprGetToken
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cmp al,'|'
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jz .Or
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cmp al,'&'
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jz .And
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cmp al,'^'
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jz .Xor
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cmp al,'+'
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jz .Add
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cmp al,'-'
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jz .Sub
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cmp al,'*'
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jz .Mul
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cmp al,'/'
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jz .Div
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cmp al,'('
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jz .LP
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cmp al,')'
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jnz .NotSign
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.RP:
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mov al,TokenRP
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ret
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.Or:
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mov al,TokenOr
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ret
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.And:
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mov al,TokenAnd
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ret
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.Xor:
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mov al,TokenXor
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ret
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.Div:
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mov al,TokenDiv
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ret
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.EndToken:
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mov al,TokenEnd
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ret
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.Add:
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mov al,TokenAdd
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ret
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.Sub:
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mov al,TokenSub
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ret
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.Mul:
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mov al,TokenMul
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ret
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.LP:
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mov al,TokenLP
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ret
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.NotSign:
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dec esi
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call FindReg
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jc .RegNotFound
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mov al,TokenReg
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ret
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.RegNotFound:
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; test for symbol
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push esi
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@@:
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lodsb
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cmp al,' '
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ja @B
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push eax
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mov byte [esi],0
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xchg esi,[esp+4]
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call FindSymbolName
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mov edi,eax
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pop eax
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xchg esi,[esp]
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mov byte [esi],al
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jc @F
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add esp,4
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mov al,TokenHex
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ret
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@@:
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pop esi
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; test for hex number
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xor ecx,ecx
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xor edi,edi
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xor eax,eax
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@@:
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lodsb
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call IsHexDigit
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jc @F
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shl edi,4
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or edi,eax
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inc ecx
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jmp @B
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@@:
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dec esi
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jecxz .Err
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cmp ecx,8
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ja .Err
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mov al,TokenHex
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ret
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.Err:
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mov al,TokenErr
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mov esi,aParseError
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ret
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;-----------------------------------------------------------------------------
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ExprRead2:
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cmp al,TokenHex
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jz .Hex
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cmp al,TokenReg
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jz .Reg
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cmp al,TokenLP
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jz .LP
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mov al,TokenErr
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mov esi,aParseError
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ret
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.Hex:
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mov ebp,edi
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.Ret:
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jmp ExprGetToken
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.Reg:
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cmp edi,24
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jz .EIP
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sub edi,4
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jb .8LO
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sub edi,4
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jb .8HI
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sub edi,8
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jb .16
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mov ebp,[_EAX+edi*4]
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jmp .Ret
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.16:
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movzx ebp,word [_EAX+(edi+8)*4]
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jmp .Ret
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.8LO:
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movzx ebp,byte [_EAX+(edi+4)*4]
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jmp .Ret
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.8HI:
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movzx ebp,byte [_EAX+(edi+4)*4+1]
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jmp .Ret
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.EIP:
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mov ebp,[_EIP]
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jmp .Ret
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.LP:
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call ExprGetToken
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call ExprRead0
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cmp al,TokenErr
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jz @F
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cmp al,TokenRP
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jz ExprGetToken
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mov al,TokenErr
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mov esi,aParseError
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@@:
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ret
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;-----------------------------------------------------------------------------
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ExprRead1:
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call ExprRead2
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.1:
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cmp al,TokenMul
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jz .Mul
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cmp al,TokenDiv
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jz .Div
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ret
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.Mul:
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push ebp
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call ExprGetToken
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call ExprRead2
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pop edx
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; ebp := edx*ebp
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imul ebp,edx
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jmp .1
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.Div:
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push ebp
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call ExprGetToken
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call ExprRead2
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pop edx
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; ebp := edx/ebp
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test ebp,ebp
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jz .Div0
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push eax
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xor eax,eax
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xchg eax,edx
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div ebp
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xchg eax,ebp
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pop eax
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jmp .1
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.Div0:
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mov al,TokenErr
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mov esi,aDivByZero
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ret
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;-----------------------------------------------------------------------------
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ExprRead0:
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xor ebp,ebp
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cmp al,TokenOr
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jz .Or
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cmp al,TokenAnd
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jz .And
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cmp al,TokenXor
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jz .Xor
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cmp al,TokenAdd
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jz .Add
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cmp al,TokenSub
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jz .Sub
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call ExprRead1
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.1:
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cmp al,TokenOr
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jz .Or
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cmp al,TokenAnd
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jz .And
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cmp al,TokenXor
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jz .Xor
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cmp al,TokenAdd
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jz .Add
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cmp al,TokenSub
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jz .Sub
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ret
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.Or:
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push ebp
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call ExprGetToken
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call ExprRead1
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pop edx
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; ebp := edx | ebp
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or ebp,edx
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jmp .1
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.And:
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push ebp
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call ExprGetToken
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call ExprRead1
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pop edx
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; ebp := edx & ebp
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and ebp,edx
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jmp .1
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.Xor:
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push ebp
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call ExprGetToken
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call ExprRead1
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pop edx
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; ebp := edx ^ ebp
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xor ebp,edx
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jmp .1
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.Add:
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push ebp
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call ExprGetToken
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call ExprRead1
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pop edx
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; ebp := edx+ebp
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add ebp,edx
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jmp .1
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.Sub:
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push ebp
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call ExprGetToken
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call ExprRead1
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pop edx
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; ebp := edx-ebp
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xchg edx,ebp
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sub ebp,edx
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jmp .1
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;-----------------------------------------------------------------------------
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; in: esi->expression
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; out: CF=1 if error
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; CF=0 and ebp=value if ok
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CalcExpression:
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call ExprGetToken
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call ExprRead0
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cmp al,TokenEnd
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jz .End
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cmp al,TokenErr
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jz @F
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mov esi,aParseError
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@@:
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call PutMessage
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stc
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ret
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.End:
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clc
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ret
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GetArg:
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lodsb
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cmp al,' '
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ja GetArg
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mov byte [esi-1],0
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cmp al,0
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jnz .SkipSpaces
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dec esi
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.SkipSpaces:
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lodsb
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cmp al,0
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jz @F
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cmp al,' '
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jbe .SkipSpaces
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@@:
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dec esi
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ret
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