ARM ARM7TDMI User Manual download pdf (Page 15)

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3.6.4 ENTRY – Code Entry Point

Syntax: ENTRY

Description: The ENTRY directive indicates the point in the code where program

execution should begin. There should be only ONE entry point per complete program.

Note that in developing the software for an embedded system, execution will begin at

the reset vector, so the code entry point will be determined by what code is linked at

that address and the ENTRY directive is not used.

3.6.5 EXPORT – Export

Syntax: EXPORT symbol

Description: Instructs the assembler to include the symbol description in the output file

so that it can be used by the linker to resolve external references.

3.6.6 EXTERN – External Symbol

Syntax: EXTERN symbol

Description: Informs the assembler that the symbol is defined in another source file. If

no reference is made to the symbol, it is not imported into the file.

3.6.7 GLOBAL – Global

Synonym for EXPORT.

3.6.8 INCLUDE – Include File

Syntax: INCLUDE filename

Description: The listed file is read in by the assembler as though it were part of the

source file before it proceeds to the next line in the source file. INCLUDEs can be

nested.

3.6.9 IMPORT – Import

Syntax: IMPORT symbol

Description: Informs the assembler that the symbol is defined in another source file.

The symbol is imported whether it is referenced in the file or not.

3.6.10 KEEP – Keep Local Symbols

Syntax: KEEP {symbol}

Description: Forces the assembler to describe the symbol in its output file, so it will be

visible to the debugger. If symbol is blank, all local symbols are preserved. By default,

the ARM assembler only preserves symbols in the output file if they are EXPORTed or

require relocation.

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ARM ARM7TDMI User Manual Page 15