Microsoft KB Archive/102432

= FIX: Incorrect RET Generated for PROC when EPILOGUE:NONE =

Article ID: 102432

Article Last Modified on 10/14/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition
 * Microsoft Macro Assembler 6.0a
 * Microsoft Macro Assembler 6.0b
 * Microsoft Macro Assembler 6.1 Standard Edition
 * Microsoft Macro Assembler 6.1a

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This article was previously published under Q102432



SYMPTOMS
When Microsoft Macro Assembler (MASM) processes source code for an application, it may generate the incorrect form for a RET instruction in a PROC. Specifically, the assembler generates a RET 4 instruction instead of a RET instruction when the source code contains a RET instruction.



CAUSE
The source code uses the OPTION EPILOGUE statement multiple times to set the EPILOGUE macro to NONE.



RESOLUTION
Modify the source code to specify RET 0. The assembler translates this expression into a RET instruction.



STATUS
Microsoft has confirmed this to be a problem in MASM versions 6.0, 6.0a, 6.0b, 6.1, and 6.1a. This problem was corrected in MASM for MS-DOS version 6.11.



MORE INFORMATION
The following code example demonstrates this problem:

Sample Code
; Assembler options needed: /c /Fl /Sa

.MODEL small, Pascal

_text SEGMENT

OPTION EPILOGUE:NONE p0 PROC parm1:DWORD ret                ; This correctly generates a RET p0 ENDP

OPTION EPILOGUE:EpilogueDef p1 PROC parm1:DWORD ret                ; This correctly generates a RET 4 p1 ENDP

OPTION EPILOGUE:NONE p2 PROC parm1:DWORD ret                ; This incorrectly generates a RET 4 p2 ENDP

_text ENDS

END

Additional query words: 6.00 6.00a 6.00b 6.10 6.10a buglist6.00a buglist6.00b buglist6.10 buglist6.10a fixlist6.11

Keywords: kbfix KB102432

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