Forward reference in a .DB8 directive is prohibited, no error occurs even when a .DB8 directive is forward referenced. Define the symbol before it is a .DB8 directive in order to prevent forward reference.
.DB8 SYM1 ; Forward reference is prohibited
SYM1 .EQU 0x12345 ; Define the symbol after it is a .DB8 directive
SYM2 .EQU 0x12345 ; Define the symbol before it is a .DB8 directive
.DB8 SYM2 ; Backward reference can be described.
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