參數(shù)資料
型號： RX30000
英文描述： RX4000 Installation | User＇s Manual[10/2001]
中文描述： RX4000安裝|用戶手冊[10/2001]
文件頁數(shù)： 45/111頁
文件大?。?/td> 391K
代理商： RX30000
User's Manual U13687EJ1V2UM
45
CHAPTER 5 INTERFACE LIBRARIES
This chapter describes the interface libraries provided by RX4000.
5.1 OUTLINE
RX4000 provides an interface library that is positioned between the user's processing program and the nucleus
of RX4000. The interface library performs the data setting and other processing required for the nucleus to carry out
its functions, before passing control to the nucleus.
Processing programs (tasks, non-tasks) coded in C are generated in the external function format which is used to
issue system calls and call extended SVC handlers. The format for issue (to the nucleus), which can be recognized
by the nucleus, however, differs from the external function format.
This necessitates a procedure (interface) for converting the external function format, used to issue system calls
and to call extended SVC handlers, into a format that can be issued to the nucleus. This type of interface between a
processing program and the nucleus is provided for each system call. The interface library contains a collection of
such interfaces.
Figure 5-1 shows the interface library position.
Figure 5-1. Position of Interface Library
External function
format
Format for issue
to the nucleus
Nucleus
Task
Interface library
System call issue
System call
processing
Interface
processing
The use of the interface library makes it easy to separate the nucleus from the processing programs of the user.
For instance, if a need to modify the user's processing programs arises after the nucleus has been stored in ROM, it
is unnecessary to modify the contents of ROM in which the nucleus is stored. Also, the user can create load
modules while separating them into different sections.
RX4000 provides interface libraries for the following two V
R
Series C compiler packages:
CodeWarrior (produced by Metrowerks Co., Ltd.)
CCMIPE compiler (produced by Green Hills Software, Inc.)
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