Table 8.1

Examples of startup routine

; Copyright (C) 2014 Renesas Electronics Corporation

; RENESAS ELECTRONICS CONFIDENTIAL AND PROPRIETARY.

; This program must be used solely for the purpose for which

; it was furnished by Renesas Electronics Corporation. No part of this

; program may be reproduced or disclosed to others, in any

; form, without the prior written permission of Renesas Electronics

; Corporation.

; NOTE : THIS IS A TYPICAL EXAMPLE

        .public _start

        .public _exit

;-----------------------------------------------------------------------------

; RAM section

;-----------------------------------------------------------------------------

.SECTION        .dataR, DATA

.SECTION        .sdataR, DATA

;-----------------------------------------------------------------------------

; RESET vector

;-----------------------------------------------------------------------------

_start  .VECTOR 0

;-----------------------------------------------------------------------------

; startup

;-----------------------------------------------------------------------------

.SECTION        .text, TEXT

_start:

        ;--------------------------------------------------

        ; setting the stack pointer

        ;--------------------------------------------------

        MOVW    SP,#LOWW(__STACK_ADDR_START)

        ;--------------------------------------------------

        ; initializing stack area

        ;--------------------------------------------------

        MOVW    AX,#LOWW(__STACK_ADDR_END)

        CALL    !!_stkinit

        ;--------------------------------------------------

        ; hardware initialization

        ;--------------------------------------------------

        CALL    !!_hdwinit

        ;--------------------------------------------------

        ; initializing BSS

        ;--------------------------------------------------

        ; clear external variables which doesn't have initial value (near)

        MOVW    HL,#LOWW(STARTOF(.bss))

        MOVW    AX,#LOWW(STARTOF(.bss) + SIZEOF(.bss))

        BR      $.L2_BSS

.L1_BSS:

        MOV     [HL+0],#0

        INCW    HL

.L2_BSS:

        CMPW    AX,HL

        BNZ     $.L1_BSS

        ; clear saddr variables which doesn't have initial value

        MOVW    HL,#LOWW(STARTOF(.sbss))

        MOVW    AX,#LOWW(STARTOF(.sbss) + SIZEOF(.sbss))

        BR      $.L2_SBSS

.L1_SBSS:

        MOV     [HL+0],#0

        INCW    HL

.L2_SBSS:

        CMPW    AX,HL

        BNZ     $.L1_SBSS

        ;--------------------------------------------------

        ; ROM data copy

        ;--------------------------------------------------

        ; copy external variables having initial value (near)

        MOV     ES,#HIGHW(STARTOF(.data))

        MOVW    BC,#LOWW(SIZEOF(.data))

        BR      $.L2_DATA

.L1_DATA:

        DECW    BC

        MOV     A,ES:LOWW(STARTOF(.data))[BC]

        MOV     LOWW(STARTOF(.dataR))[BC],A

.L2_DATA:

        CLRW    AX

        CMPW    AX,BC

        BNZ     $.L1_DATA

        ; copy saddr variables having initial value

        MOV     ES,#HIGHW(STARTOF(.sdata))

        MOVW    BC,#LOWW(SIZEOF(.sdata))

        BR      $.L2_SDATA

.L1_SDATA:

        DECW    BC

        MOV     A,ES:LOWW(STARTOF(.sdata))[BC]

        MOV     LOWW(STARTOF(.sdataR))[BC],A

.L2_SDATA:

        CLRW    AX

        CMPW    AX,BC

        BNZ     $.L1_SDATA

        ;--------------------------------------------------

        ; call main function

        ;--------------------------------------------------

        CALL    !!_main          ; main();

        ;--------------------------------------------------

        ; call exit function

        ;--------------------------------------------------

        CLRW    AX               ; exit(0);

_exit:

        BR      $_exit

;-----------------------------------------------------------------------------

; section

;-----------------------------------------------------------------------------

.SECTION .RLIB, TEXTF

.L_section_RLIB:

.SECTION .SLIB, TEXTF

.L_section_SLIB:

.SECTION .textf, TEXTF

.L_section_textf:

.SECTION .const, CONST          ; Only for a device with the mirror area

.L_section_const:               ; Only for a device with the mirror area

.SECTION .constf, CONSTF

.L_section_constf:

.SECTION .data, DATA

.L_section_data:

.SECTION .sdata, SDATA

.L_section_sdata:

.SECTION .bss, BSS

.L_section_bss:

.SECTION .sbss, SBSS

.L_section_sbss: