Syntax and semantics

The syntax and semantics of assembler language are defined.

This overview explains the syntax and semantics of assembler language, including the following items:

Character set
There are defined characters in the operating system assembler language.
Reserved words
There are no reserved words in the operating system assembler language.
Line format
The assembler supports a free-line format for the source files.
Statements
The assembler language has three kinds of statements: instruction statements, pseudo-operation statements, and null statements. The assembler also uses separator characters, labels, mnemonics, operands, and comments.
Symbols
The symbol is used as a label operand.
Relocation specifiers
The relocation specifiers are used after symbol names or QualNames.
Constants
The assembler language provides four kinds of constants.
Operators
The assembler provides three types of unary operators.
Expressions
An expression is formed by one or more terms.

Parent topic: Assembler language reference