startup_rom.s

来自「T－kernel Tcp/ip Protocol Stack Sample」· S 代码 · 共 62 行

/*""FILE COMMENT""*************************************************************
*   System Name : RENESAS T-Engine/micro T-Engine series
*   File Name   : startup.S 
*   Version     : 1.00.00
*   Contents    : T-Kernel extended SVC interface library
*               : created from tcpip_svcdef.h
*   Model       : M32R
*   CPU         : M32R
*   Compiler    : GNU
*   OS          : T-Kernel
*   note        : The Software is being delivered to you "AS IS" 
*               : and Renesas,whether explicitly or implicitly makes  
*               : no warranty as to its Use or performance. 
*               : RENESAS AND ITS SUPPLIER DO NOT AND CANNOT WARRANT 
*               : THE PERFORMANCE OR RESULTS YOU MAY OBTAIN  BY USING 
*               : THE SOFTWARE. AS TO ANY MATTER INCLUDING WITHOUT 
*               : LIMITATION NONINFRINGEMENT OF THIRD PARTY RIGHTS,
*               : MERCHANTABILITY, INTEGRATION, SATISFACTORY QUALITY, 
*               : OR FITNESS FOR ANY PARTICULAR PURPOSE.
*
*   Copyright (c) 2005 MITSUBISHI ELECTRIC CORP. All Rights Reserved.
*   AND RENESAS TECHNOLOGY CORP. All Rights Reserved.
*   AND RENESAS SOLUTIONS CORP. All Rights Reserved.
*
*   history     : 2005.12.01 Ver.1.00.00
*""FILE COMMENT END""*********************************************************/

	.text
	.balign	4
	.globl	_startup
_startup:
	seth	r4, #shigh(__data_org)
	add3	r4, r4, #low(__data_org)
	seth	r5, #shigh(__data_start)
	add3	r5, r5, #low(__data_start)
	beq	r4, r5, l_noinit

	seth	r6, #shigh(_edata)	// initialize data area
	add3	r6, r6, #low(_edata)
	beq	r5, r6, nocopy_data
	addi	r5, #-4
	addi	r6, #-4
  copy_data:
	ld	r7, @r4+
	st	r7, @+r5
	bne	r5, r6, copy_data
  nocopy_data:

	ldi	r7, #0			// clear bss area
	seth	r4, #shigh(__bss_start - 4)
	add3	r4, r4, #low(__bss_start - 4)
	seth	r5, #shigh(_end - 4)
	add3	r5, r5, #low(_end - 4)
	beq	r4, r5, nobss
  clrbss:
	st	r7, @+r4
	bne	r4, r5, clrbss
  nobss:

  l_noinit:
	bra	main