chipcon_cexit.s51

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Filename:     chipcon_cexit.s51
Target:       cc2510
Author:       KJA
Revised:      20/6-2006
Revision:     1.0

Description:
System termination code for the 8051 IAR Systems C/EC++ Compiler.

For CLIB there is no option to set to get rid of the last system break point. 
When the compiler build the application with debug information the debug 
variant of the "cexit" module will be included.

To get around this you have to exclude the debug label "?C_EXIT" from the 
application. You can do this by including this file in your project. 

The "?exit" module will replace the one in your library.

Include this file in the project and add $TOOLKIT_DIR$\SRC\LIB\ to
the assembler include path.

Copyright 2004-2005 IAR Systems. All rights reserved.

******************************************************************************/

;
; Naming covention of labels in this file:
;
;  ?xxx	  - External labels only accessed from assembler.
;  __xxx   - External labels accessed from or defined in C.
;  xxx	  - Labels local to one module (note: this file contains
;           several modules).
;  main	  - The starting point of the user program.
;

#define XRSEGCSTART RSEG CSTART:CODE:NOROOT
#include "iar_common.h"

	     EXTERNS_FOR_ALL_DPTR_SYMBOLS()

#if (defined(__DLIB_BUILD__) )


//------------------------------------------------------------------------
//
// DLIB exit sequence
//

// ---------------------------------------------------------
// The exit system
//
// The default exit function, written in C, calls _exit provided
// below.  This function performs system cleanup and calls __exit that
// halts the system.
//

// -----------------------------------------------
// _exit -- Perform system cleanup and jump to __exit.
//
// The module below contains a number of segment parts that is
// included in the final application only if they are needed.
//

   XRSEGCSTART
   MODULE    ?cexit
   PUBLIC    _exit
   FUNCTION  _exit,0203H
   EXTERN    __exit
   REQUIRE   __exit
   REQUIRE   ?exit_br_xxexit

_exit:

// -------------------------------------
// Segment part included if the argument to exit must be saved and
// later restored.

   XRSEGCSTART
   REQUIRE ?exit_restore

?exit_save:
   MOV     A,R2
   MOV     R6,A
   MOV     A,R3
   MOV     R7,A


// -------------------------------------
// Segment part included if destructors must be called.

   XRSEGCSTART
   PUBLIC  __cstart_call_dtors
   EXTERN  __call_dtors
   REQUIRE ?exit_save

   // This label is required by "__record_needed_destruction".
__cstart_call_dtors:
#if (__CODE_MODEL__ == __CM_BANKED__)
   EXTERN  ?BCALL

   MOV     DPL,#low(__call_dtors)
   MOV     DPH,#high(__call_dtors)
#ifdef __EXTENDED_DPTR__
   MOV     ?DPX,#0
#endif
   MOV     A,#BYTE3(__call_dtors)
   LCALL   ?BCALL
#else
   LCALL   __call_dtors
#endif


// -------------------------------------
// Segment part included if DLib standard IO is used.

   XRSEGCSTART
   PUBLIC  __cstart_closeall
   REQUIRE ?exit_save

   // This label is required by DLib.
__cstart_closeall:
   EXTERN  _Close_all
#if (__CODE_MODEL__ == __CM_BANKED__)
   EXTERN  ?BCALL

   MOV     DPL,#low(_Close_all)
   MOV     DPH,#high(_Close_all)
#ifdef __EXTENDED_DPTR__
   MOV     ?DPX,#0
#endif
   MOV     A,#BYTE3(_Close_all)
   LCALL   ?BCALL
#else
   LCALL   _Close_all
#endif


// -------------------------------------
// Restore the argument previously stored by the "save" section above.

   XRSEGCSTART

?exit_restore:
   MOV     A,R6
   MOV     R2,A
   MOV     A,R7
   MOV     R3,A

   XRSEGCSTART

   // Jump to __exit.
?exit_br_xxexit:

#if (__CODE_MODEL__ == __CM_BANKED__)
   EXTERN  ?BCALL

   MOV     DPL,#low(__exit)
   MOV     DPH,#high(__exit)
#ifdef __EXTENDED_DPTR__
   MOV     ?DPX,#0
#endif
   MOV     A,#BYTE3(__exit)
   LCALL   ?BCALL
#else
   LJMP     __exit         // __exit will not return
#endif

   ENDMOD

   END


#else // __CLIB_BUILD__


//------------------------------------------------------------------------
//
// CLIB exit(int code)
//
//------------------------------------------------------------------------

   MODULE   ?cexit

   PUBLIC   exit
   // PUBLIC   ?C_EXIT
   XRSEGCSTART
	FUNCTION exit,0203H

exit:
   // ?C_EXIT:
   PUBLIC  ?ROM_MONITOR_NOPS

?ROM_MONITOR_NOPS:
   NOP                     ; Three NOPs for ROM-Monitor breaks.
   NOP
   NOP

   SJMP    exit
	
   ENDMOD

   END
#endif