The Art of Assembly Language, 2nd Edition

3.5 Address Expressions

Earlier, this chapter points out that addressing modes take a couple generic forms, including the following:

VarName[ Reg32 ]
VarName[ Reg32 + offset ]
VarName[ RegNotESP32*scale ]
VarName[ Reg32 + RegNotESP32*scale ]
VarName[ RegNotESP32*scale + offset ]
VarName[ Reg32 + RegNotESP32*scale + offset ]

Another legal form, which isn't actually a new addressing mode but simply an extension of the displacement-only addressing mode, is:

VarName[ offset ]

This latter example computes its effective address by adding the constant offset within the brackets to the variable's address. For example, the instruction mov(Address[3], al); loads the AL register with the byte in memory that is 3 bytes beyond the Address object (see Figure 3-8 ...