Microsoft KB Archive/94943

= FIX: No Stack Frame From CMACROS.INC cProc FORCEFRAME =

Article ID: 94943

Article Last Modified on 11/15/2003

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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
 * Microsoft Macro Assembler 6.11 Standard Edition

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This article was previously published under Q94943



SYMPTOMS
When an application includes the CMACROS.INC file and specifies the FORCEFRAME option with the cProc macro, the assembler does not generate a stack frame.



CAUSE
The code to determine that the application specifies the FORCEFRAME option was omitted from the cProc macro.



RESOLUTION
To correct this problem, add the following three lines to CMACROS.INC. Modify version 5.3 to add the following lines before line 876 or modify version 5.31 to add the following lines before line 1518. ifidn , ?ff=1 endif Alternately, modify the application source code to remove the cProc macro and in its place specify the PROC directive with the FORCEFRAME argument.



STATUS
Microsoft has confirmed this to be a problem in CMACROS.INC versions 5.3 and 5.31 distributed with MASM versions 6.0, 6.0a, 6.0b, 6.1, and 6.1a. This problem was corrected in the CMACROS.INC distributed with MASM for MS-DOS version 6.11.



MORE INFORMATION
The corrected CMACROS.INC file is as follows: The corrected CMACROS.INC file is as follows:

ifidn , ?nx=1 endif

ifidn , ?ff=1 endif

ifidn , ?pcc=0 endif Comments in the CMACROS.INC file version 5.31 document the cProc macro as follows:   cProc - define a 'c' procedure

cProc is the procedure definition for procedures.

format: cProc n,cf,a where: n      is the name of the procedure

cf     controls certain definitions, and may be: NEAR      proc is to be a near label FAR       proc is to be a far label PUBLIC    proc is to be defined as public SMALL     call makeframe procedure NODATA    don't create prolog code to setup DS                      ATOMIC     don't link stack if not needed NODATA must be specified for ATOMIC FORCEFRAME Force generation of a frame C         proc is to be a C procedure PLM       proc is to be a PL/M procedure PASCAL    proc is to be a PL/M procedure WIN       proc is to be a Windows procedure NONWIN    proc isn't to be a Windows procedure

a      is a list of registers that are to be saved whenever the procedure is invoked.

makeframe procedure: If small is specified, then the &quot;makeframe procedure&quot; is invoked instead of generating normal prologues/epilogues

A call is performed to the makeframe procedure. The call is followed by two bytes. the first byte is the number of locals to allocate for the frame, the second is the number of bytes of parameters. The makeframe procedure will in turn call the cProc routine at the address following the data bytes. When the cProc is                   finished, it will do a near return to the makeframe procedure to clean up the frame and exit.

Note that register parameters and makeframe are incompatible and cannot be used together.

The makeframe procedure will save SI, DI, and also DS                   if a far procedure. These registers will be removed from the autosave list if specified. The following code example demonstrates this problem.

Sample Code
; Assemble options needed: none

INCLUDE cmacros.inc

sBegin code assumes cs, code assumes ds, data cProc my_proc, , <> cBegin my_proc     ; stack frame prologue code belongs here xor bx, bx  cEnd                ; stack frame epilogue code belongs here sEnd

_text SEGMENT start: call my_proc mov ax, 4C00h int 21h _text ENDS END start

Additional query words: 5.30 6.00 6.00a 6.00b 6.10 6.10a buglist6.00a buglist6.00b buglist6.10 buglist6.10a fixlist6.11

Keywords: kbfix KB94943

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