2025-02-MicroprocessorApplication/5.md

ARM ISA

Syntax of Assembly

• Label: Define a symbol

label:

• Instruction
• Directive

.directive[;]

• macro_invocation

Assembly Expression

Expressions consist of one or more integer literals or symbol references, combined using operators. Expression can be used as instruction operands or directive argument.

Assembler evaluates all expression, which means no rum-time evaluation.

Assembly Expressions are

• Constnats
• Symbol References
• Operators
  • Unary Operators: +, -, ~
  • Binary Operators: +, -, *, /, %
  • Binary Logical Operators: &&, ||
  • Binary Bitwise Operators: &, |, ^, >>, <<
  • Binary Comparison Operators: <, <=, >, >=, ==, !=