Expression rules in scatter files

Expressions are made up of the following:

• Decimal or hexadecimal numbers.

• Arithmetic operators: +, -, /, *, ~, OR, and AND

  The OR and AND operators map to the C operators | and & respectively.

• Logical operators: LOR, LAND, and !

  The LOR and LAND operators map to the C operators || and && respectively.

• Relational operators: <, <=, >, >=, and ==

  Zero is returned when the expression evaluates to false and nonzero is returned when true.

• Conditional operator: Expression ? Expression1 : Expression2

  This matches the C conditional operator. If Expression evaluates to nonzero then Expression1 is evaluated otherwise Expression2 is evaluated.

  Note:

  When using a conditional operator in a +offset context on an execution region or load region description, the final expression is considered relative only if both Expression1 and Expression2, are considered relative. For example:

  er1 0x8000
  {
      …
  }
  er2 ((ImageLimit(er1) < 0x9000) ? +0 : +0x1000)    ; er2 has a relative address
  {
      …
  }
  er3 ((ImageLimit(er2) < 0x10000) ? 0x0 : +0)       ; er3 has an absolute address
  {
      …
  }

• Functions that return numbers.

All operators match their C counterparts in meaning and precedence.

Expressions are not case-sensitive and you can use parentheses for clarity.