/* This code is in the public domain. You may use, modify or distribute it freely. */

/* Yet another C startup routine for CC-RL compiler and RL78/G10 group */

#pragma inline_asm start

void __near start(void)
{
	//--------------------------------------------------
	// setting the stack pointer
	//--------------------------------------------------
	MOVW	SP, #LOWW(__STACK_ADDR_START)

	//--------------------------------------------------
	// hardware initialization (this code assumes ROM < 64K)
	//--------------------------------------------------
	// hdwinit function here cannot use any global/static variables
	// because they are not initialized with zero nor data
	// and they will be initialized with zero or data
#if 1 // you can set 0 if you want to call hdwinit in main function
	CALL	!_hdwinit
#endif

	//--------------------------------------------------
	// RAM clear (this code assumes RAM size > 0)
	//--------------------------------------------------
	CLRW	AX
	MOVW	BC, #LOWW(__RAM_ADDR_END - __RAM_ADDR_START)
.L1_RAM:
	DECW	BC
	MOV		#LOWW(__RAM_ADDR_START)[BC], A
	CMPW	AX, BC
	BNZ		$.L1_RAM

	//--------------------------------------------------
	// ROM data copy (this code assumes ROM < 64K)
	//--------------------------------------------------
#if 1 // you can set 0 if there are no variables having initial value
	MOV		ES, A // A = 0 just after RAM clear is finished

#if 1  // you can set 0 if there are no normal variables having initial value
	// copy external variables having initial value
	MOVW	DE, #LOWW(STARTOF(.data))
	MOVW	HL, #LOWW(STARTOF(.dataR))
	MOVW	BC, #LOWW(STARTOF(.dataR) + SIZEOF(.dataR))
	CALL	!.romdatacopy
#endif

#if 1  // you can set 0 if there are no saddr variables having initial value
	// copy saddr variables having initial value
	MOVW	DE, #LOWW(STARTOF(.sdata))
	MOVW	HL, #LOWW(STARTOF(.sdataR))
	MOVW	BC, #LOWW(STARTOF(.sdataR) + SIZEOF(.sdataR))
	CALL	!.romdatacopy
#endif
#endif

	//--------------------------------------------------
	// call main function (this code assumes ROM < 64K)
	//--------------------------------------------------
	//CALL	!_main
//.L1_EXIT:
	//BR	$.L1_EXIT
	// main function never return (this reduces 4 bytes of stack usage)
	BR		!_main

	//--------------------------------------------------
	// romdatacopy (this code assumes ROM < 64K)
	//--------------------------------------------------
#if 1 // you can set 0 if there are no variables having initial value
	//MOV	ES, #0 // ROM
	//MOVW	DE, #LOWW(STARTOF(.xxx)) // ROM
	//MOVW	HL, #LOWW(STARTOF(.xxxR)) // RAM
	//MOVW	BC, #LOWW(STARTOF(.xxxR) + SIZEOF(.xxxR)) // RAM
.L1_DATA:
	MOV		A,ES:[DE]
	MOV		[HL], A
	INCW	DE
	INCW	HL
.romdatacopy:
	MOVW	AX, BC
	CMPW	AX, HL
	BNZ		$.L1_DATA
	//RET is in the next line
#endif
}

#if 0 // please set 1 when exit function is necessary
void __near exit(void)
{
	for (;;) {}
}
#endif