cexit.s51

来自「8051试验程序 基础教材」· S51 代码 · 共 219 行

/*******************************************************************************
 *
 * System termination code for the 8051 IAR Systems C/EC++ Compiler.
 *
 * Copyright 2004-2005 IAR Systems. All rights reserved.
 *
 * $Revision: 4427 $
 *
 ******************************************************************************/

;
; 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
#if ( __CODE_MODEL__ == __CM_BANKED__)
        PUBLIC ??_exit?relay
_exit		SYMBOL "_exit"
??_exit?relay	SYMBOL "?relay", _exit

        FUNCTION  ??_exit?relay,0203H

#endif
	
_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
  #elif (__CORE__ == __CORE_EXTENDED2__ )
	EXTERN ?MEX1
	MOV ?MEX1, #BYTE3(__call_dtors)
	LCALL   __call_dtors & 0xFFFF 
  #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
  #elif (__CORE__ == __CORE_EXTENDED2__ )
	EXTERN ?MEX1
	MOV ?MEX1, #BYTE3(__exit)
	LJMP     __exit & 0xFFFF // __exit will not return
  #else
        LJMP     __exit          // __exit will not return
  #endif

  #if ( __CODE_MODEL__ == __CM_BANKED__)
	RSEG BANK_RELAYS:CODE:REORDER:NOROOT(0)
??_exit?relay:
        EXTERN  ?BDISPATCH
        LCALL   ?BDISPATCH
        DATA
        DC24    _exit
  #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    ?C_EXIT
	
        ENDMOD

        END


#endif