FIX: ORG Following ORG Statement with $ May Fail in 6.0

• Microsoft Macro Assembler for MS-DOS and OS/2, version 6.0

SYMPTOMS

The Microsoft Macro Assembler (MASM) version 6.0 may generate an incorrect offset when using the ORG directive following a previous ORG statement that uses the current-address operator ($). For example, incorrect code will be generated if the statement "ORG $+1" is placed anywhere before another ORG statement.

STATUS

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

MORE INFORMATION

The sample code below demonstrates this problem. You can see in the source listing that the label "wrongoffset" has an incorrect offset. Instead of having an offset of 200h, wrongoffset is placed at offset 304h, which is 104h plus the 200h specified in the last ORG statement. Rather than assigning the location to 200h, the assembler added 200h to the current location.

Sample Code

; Assemble options needed: none

_text SEGMENT
one   BYTE ?
      ORG 100h
two   BYTE ?
      ORG $+2
three BYTE ?
      ORG 200h
wrongoffset LABEL word
_text ENDS
END 

Source Listing

0000               _text SEGMENT
0000 00            one   BYTE ?
                     ORG 100h
0100 00            two   BYTE ?
                     ORG $+2
0103 00            three BYTE ?
                     ORG 200h
0304               wrongoffset LABEL word
0304               _text ENDS
               END 

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

Keywords :
Version : MS-DOS:6.0
Platform : MS-DOS
Issue type :