Arm VERSION 1.2 Manual de usuario descargar pdf (Pagina 86)

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Assembler Reference

3.2 Format of source lines

The general form of source lines in an ARM assembly language module is:

{symbol} {instruction|directive|pseudo-instruction} {;comment}

All three sections of the source line are optional.

Instructions cannot start in the first column. They must be preceded by white space even

if there is no preceding symbol.

You can write directives in all upper case, as in this manual. Alternatively, you can write

directives in all lower case. You must not write a directive in mixed upper and lower

case.

You can use blank lines to make your code more readable.

symbol

is usually a label (see Labels on page 3-15). In instructions and

pseudo-instructions it is always a label. In some directives it is a symbol for a variable

or a constant. The description of the directive makes this clear in each case.

symbol

must begin in the first column and cannot contain any whitespace character such

as a space or a tab (see Symbol naming rules on page 3-12).

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Arm VERSION 1.2 Manual de usuario Pagina 86

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