I would like to get some help with this questions: what is correct and legal in following definition of the data segment:
data segment
x db -23, 3 or 4, not -3, 9 xor 15, 129, $+x, SEG x, -128 LT 80h
db -129, x+1, b2h, 256, 7852h, byte ptr z
y dw z-2, -7852h, x[2], offset bx
z dd z-y, FAR PTR y
data ends
I consider following wrong:
- cant contain operations: 3 or 4, not -3, 9 xor 15, FAR PTR y, offset bx ...
- cant reference same varaible : $+x
And correct:
- -23, 129, 7852h ...
- a db 'abc'
lengthOfa EQU ($-s)
Am i right about this facts?
Why don't you let the assembler answer? x, y, z are only labels, not variables. So you can separate the values and write them in several lines. Consider to keep the declarations (db, dw, dd). Build an assembly source text, let it assemble and look which line contains which error:
data segment
x db -23
db 3 or 4
db not -3
db 9 xor 15
db 129
db $+x ; TASM: Can't add relative quantities - MASM: error A2101: cannot add two relocatable labels
db SEG x ; TASM: Not expecting group or segment quantity - MASM: error A2071: initializer magnitude too large for specified size
db -128 LT 80h
db -129
db x+1 ; TASM: Expecting scalar type - MASM: error A2071: initializer magnitude too large for specified size
db b2h ; TASM: Undefined symbol: B2H - MASM: error A2006: undefined symbol : b2h
db 256 ; TASM: Value out of range - MASM: error A2071: initializer magnitude too large for specified size
db 7852h ; TASM: Value out of range - MASM: error A2071: initializer magnitude too large for specified size
db byte ptr z ; TASM: Expecting scalar type - MASM: error A2071: initializer magnitude too large for specified size
y dw z-2
dw -7852h
dw x[2]
dw offset bx ; TASM: Illegal use of register - MASM: error A2032: invalid use of register
z dd z-y
dd FAR PTR y
data ends
code segment
start:
ret
code ends
end start