What Is a Macro Instruction?

A macro is a pseudo-instruction in an assembly language program.

A macro is a pseudo-instruction in an assembly language program.

A macro is a piece of source program that represents a function.

Chinese name

Macro

Macro

A pseudo-instruction in an assembly language program

The format is

[Macro name] MACRO [Formal parameter]

Macro call format

[Macro name] [Actual parameters]

Attributes

Pseudo-instruction

Field

computer

Its format is

[Macro name] MACRO [Formal parameter]

...

Snippet

...

ENDM

E.g:

MOV_ macro f1, f2

mvl f1, w, acce; put the data in f1 address into W register, the data in f1 is unchanged

mvf f2, w, acce; put data in W register to f2 address

ENDM; this instruction is equivalent to assigning the data in f1 to f2, and the data in f1 is unchanged

"Formal parameters" are used and they are replaced by names or values (real parameters) given when referring to the macro. The use of formal parameters gives great flexibility to macros.

Macro call format

[Macro name] [Actual parameters]

The real parameter item will correspond to the formal parameter in the replacement macro instruction. If the formal parameter is a label, then in the macro call, the actual parameter should also be a label, and the actual parameter is required to be unique. If the macro definition has its own label, the assembler automatically turns the label into a unique label when the macro is called.