GE DS200TCEAG1BNE output module

GE DS200TCEAG1BNE output module

Technical data of product parameters

inker based system initialisation automatically lets RTEMS only link into the executable the
system initialisation code referenced by the user’s application or indirectly by RTEMS. The technique is a varation of the system initialisation process used in the FreeBSD kernel. It is also
similar to the process used by the C++ language to run static constructors before entering
main and destructors after exit is called.
Linker based system initialisation collects the address of referenced system initialisation functions in specially named sections. The system initialisation function’s address is placed in a
variable and the section attribute of the variable is set to a special section name. The linker is
instructed via a special linker command file to collect these variables together to create a table.
The start-up code in DS200TCEAG1BNE loops over the table of addresses and calling each address or system initialisation function. Special section names given to the variables sorts the table placing
the functions in a specific order.
A user places a call to an API function in their application and the linker pulls the API code from
the RTEMS kernel library adding it to the executing. The DS200TCEAG1BNEcode the linker loads references
the variable containing the address of the that API’s system initialisation function. The linker
loads the API system initialisation code into the executable to resolve the external refernece
created by the variable. If the user does not reference the DS200TCEAG1BNE variables is loaded into the
executable and no reference to the API system initialisation code is made so it is not linked into
the executable.
The design automatically creates a unique system intialisation table for each executable and the
code in RTEMS does not change, there is no special build system tricks, or stub libraries.
The RTEMS Execuable Information reports the tables created and you can use this information
to debug any initialisation issues.DS200TCEAG1BNE

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