Microsoft KB Archive/79067

= FIX: A2029 Incorrectly Generated If Operand = [ebx][ebx] =

Article ID: 79067

Article Last Modified on 10/22/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition

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This article was previously published under Q79067



SYMPTOMS
With the Microsoft Macro Assembler (MASM) 6.0, the following error is generated incorrectly for instructions using the operand [ebx][ebx]:

error A2029 : multiple base registers not allowed

For example:

lea esi, [ebx][ebx]

mov esi, [ebx][ebx]



RESOLUTION
A workaround for this problem is to embed the opcode for the instruction directly in the code. The sample code below demonstrates this method.



STATUS
Microsoft has confirmed this to be a problem in MASM version 6.0. This problem has been corrected in MASM version 6.0a.



MORE INFORMATION
Error A2029 will be incorrectly generated for the following program. The code that should be generated for lea esi [ebx][ebx] is 8D 34 1B. Note that the operand [ebx][ebx] is available only when using the .386 or .486 directives.

Sample Code
; Assembler options needed none

.386 .MODEL flat .STACK 4096

CODE32 SEGMENT PUBLIC USE32 main PROC near lea esi, [ebx][ebx]     ; Replace this by BYTE 8Dh, 34h, 1Bh ret main ENDP CODE32 ENDS

END

Additional query words: 6.00 buglist6.00 fixlist6.00a

Keywords: kbfix KB79067

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