ID Number: Q26796
5.00 5.10 5.10a | 5.10 5.10a
MS-DOS | OS/2
buglist5.00 buglist5.10 buglist5.10a fixlist6.00
Summary:
SYMPTOMS
The expression 'PUSH DWORD PTR OFFSET alabel' causes the Microsoft
Macro Assember (MASM) versions 5.0, 5.1, and 5.1a to generate the
error message:
error A2027: Operand expected
RESOLUTION
The line 'PUSH DWORD PTR (OFFSET alabel)' works correctly. Since
OFFSET is a unary operator, it should not require parentheses.
STATUS
Microsoft has confirmed this to be a problem in MASM versions 5.0,
5.1, and 5.1a. This problem was corrected in MASM version 6.0.
More Information:
It is important to note that the operating system that your program is
running on must be capable of supporting 32 bit code segments to be
able to run code in 32 bit segments. Most PC based operating systems
such as MS-DOS 5.0, Windows 3.0, and OS/2 1.x do not provide support
for 32 bit code segments. Newer operating systems and DOS extender
packages may provide this support.
Sample Code
-----------
; Assemble options needed: none
.MODEL small
.386
.STACK 1024
seg32 SEGMENT USE32
a32label DW 4321h
seg32 ENDS
.CODE
start:
;push DWORD PTR (OFFSET a32label) ;This is the MASM 5.0,
;5.1, and 5.1a workaround
push DWORD PTR OFFSET a32label
mov ax, 4C00h
int 21h
END start
Additional reference words: 6.00 6.00a 6.00b