Microsoft KB Archive/64535

= FIX: Incorrect Code Generated for IRET With PROC USES =

Article ID: 64535

Article Last Modified on 10/17/2003

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APPLIES TO


 * Microsoft Macro Assembler 5.1 Standard Edition
 * Microsoft Macro Assembler 5.1a

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This article was previously published under Q64535



SYMPTOMS
A procedure that uses the USES keyword cannot return by using IRET. The USES statement pushes the specified registers on the stack upon entry and pops them before exiting a procedure. If the USES keyword is used with a procedure that ends with an IRET instruction, the pushes will be generated for the procedure, but the pops will not.



STATUS
Microsoft has confirmed this to be a problem in MASM versions 5.1 and 5.1a. This problem has been corrected in MASM version 6.0.



MORE INFORMATION
The following code demonstrates the problem. The di, si, and bp registers will be pushed onto the stack, but not popped.

Source Code:
; Compile options needed: none

.model large, c

.code

first PROC far uses di si bp        MOV si,3 MOV di,4 IRET first ENDP

END first

Additional query words: 5.10 5.10a buglist5.10 buglist5.10a fixlist6.00

Keywords: kbfix KB64535

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