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21.25 ENTRY

The ENTRY directive declares an entry point to a program.




A program must have an entry point. You can specify an entrypoint in the following ways:

  • Using the ENTRY directivein assembly language source code.

  • Providing a main() functionin C or C++ source code.

  • Using the armlink --entry command-line option.

You can declare more than one entry point in a program, althougha source file cannot contain more than one ENTRY directive.For example, a program could contain multiple assembly languagesource files, each with an ENTRY directive.Or it could contain a C or C++ file with a main() functionand one or more assembly source files with an ENTRY directive.

If the program contains multiple entry points, then you must select one of them. You do this by exporting the symbol for the ENTRY directive that you want to use as the entry point, then using the armlink --entry option to select the exported symbol.


        AREA   ARMex, CODE, READONLY        ENTRY      ; Entry point for the application.        EXPORT ep1 ; Export the symbol so the linker can find itep1                ; in the object file.        ; code        END

When you invoke armlink, if other entry points are declared in the program, then you must specify --entry=ep1, to select ep1.

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