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The .macro directive executes a macro definition by assigning the macro name specified in the symbol field to a series of statements (called a macro body) described between this directive and the .endm directive.

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Define a series of frequently used statements in the source program with a macro name. After its definition only describe the defined macro name, and the macro body corresponding to the macro name is expanded.

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If the .endm directive corresponding to .macro directive does not exist, an error occurs.

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For the macro name to be described in the symbol field, see the conventions of symbol description in "(2) Symbol".

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To call macro, describe the defined macro name in the mnemonic field. If a macro that is undefined at the point is called, an error occurs.

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For the formal parameter(s) to be described in the operand field, the same rules as the conventions of symbol description will apply.

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Formal parameters are valid only within the macro body.

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The number of formal parameters must be the same as the number of actual parameters. Otherwise, an error occurs.

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The maximum number of formal parameters that can be used depends on the amount of memory.

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The number of macros that can be defined within a single source module is not specifically limited. In other words, macros may be defined as long as there is memory space available.

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If a macro is called before it has been defined, an error will be output.

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The only actual parameters that can be specified in the macro call are label names, symbol names, numbers, registers, and instruction mnemonics.
If a label expression (LABEL-1), a label beginning with a reference symbol (#LABEL), or base register specification ([gp]) or the like is specified, then a message will be output depending on the actual parameter specified, and assembly will halt.

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A line of a sentence can be designated in the macro-body. The part of a sentence, such as operand, cannot be allowed.

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An error will be output if a macro is defined in the macro body of a macro definition, but processing will continue (the content up to the corresponding ".endm" directive is ignored). Referencing a macro name will cause a definition error.

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If the entire parameter description for a macro definition or macro call is enclosed in parentheses "( )", you can start a new line within parentheses.
A left parenthesis "(" and a right parenthesis ")" can be specified once at the beginning and at the end of the parameter description, respectively. Using multiple pairs of parentheses or using the left or right parenthesis in the parameter description causes an error.
You can enter a comment on each new line in parentheses. Other descriptions should follow the rules for formal and actual parameters.