owner-nrf52sdk/nRF5_SDK_17.0.2/modules/nrfx/mdk/arm_startup_nrf51.s

; Copyright (c) 2009-2020 ARM Limited. All rights reserved.
; 
;     SPDX-License-Identifier: Apache-2.0
; 
; Licensed under the Apache License, Version 2.0 (the License); you may
; not use this file except in compliance with the License.
; You may obtain a copy of the License at
; 
;     www.apache.org/licenses/LICENSE-2.0
; 
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an AS IS BASIS, WITHOUT
; WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
; 
; NOTICE: This file has been modified by Nordic Semiconductor ASA.

                IF :DEF: __STARTUP_CONFIG
#ifdef  __STARTUP_CONFIG
#include "startup_config.h"
#ifndef __STARTUP_CONFIG_STACK_ALIGNEMENT
#define __STARTUP_CONFIG_STACK_ALIGNEMENT 3
#endif
#endif
                ENDIF

                IF :DEF: __STARTUP_CONFIG
Stack_Size      EQU __STARTUP_CONFIG_STACK_SIZE
                ELIF :DEF: __STACK_SIZE
Stack_Size      EQU __STACK_SIZE
                ELSE
Stack_Size      EQU 2048
                ENDIF
                
                IF :DEF: __STARTUP_CONFIG
Stack_Align     EQU __STARTUP_CONFIG_STACK_ALIGNEMENT
                ELSE
Stack_Align     EQU 3
                ENDIF

                AREA    STACK, NOINIT, READWRITE, ALIGN=Stack_Align
Stack_Mem       SPACE   Stack_Size
__initial_sp

                IF :DEF: __STARTUP_CONFIG
Heap_Size       EQU __STARTUP_CONFIG_HEAP_SIZE
                ELIF :DEF: __HEAP_SIZE
Heap_Size       EQU __HEAP_SIZE
                ELSE
Heap_Size       EQU 2048
                ENDIF

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem        SPACE   Heap_Size
__heap_limit

                PRESERVE8
                THUMB

; Vector Table Mapped to Address 0 at Reset

                AREA    RESET, DATA, READONLY
                EXPORT  __Vectors
                EXPORT  __Vectors_End
                EXPORT  __Vectors_Size

__Vectors       DCD     __initial_sp              ; Top of Stack
                DCD     Reset_Handler
                DCD     NMI_Handler
                DCD     HardFault_Handler
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     SVC_Handler
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     PendSV_Handler
                DCD     SysTick_Handler

                ; External Interrupts
                DCD     POWER_CLOCK_IRQHandler
                DCD     RADIO_IRQHandler
                DCD     UART0_IRQHandler
                DCD     SPI0_TWI0_IRQHandler
                DCD     SPI1_TWI1_IRQHandler
                DCD     0                         ; Reserved
                DCD     GPIOTE_IRQHandler
                DCD     ADC_IRQHandler
                DCD     TIMER0_IRQHandler
                DCD     TIMER1_IRQHandler
                DCD     TIMER2_IRQHandler
                DCD     RTC0_IRQHandler
                DCD     TEMP_IRQHandler
                DCD     RNG_IRQHandler
                DCD     ECB_IRQHandler
                DCD     CCM_AAR_IRQHandler
                DCD     WDT_IRQHandler
                DCD     RTC1_IRQHandler
                DCD     QDEC_IRQHandler
                DCD     LPCOMP_IRQHandler
                DCD     SWI0_IRQHandler
                DCD     SWI1_IRQHandler
                DCD     SWI2_IRQHandler
                DCD     SWI3_IRQHandler
                DCD     SWI4_IRQHandler
                DCD     SWI5_IRQHandler
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved
                DCD     0                         ; Reserved

__Vectors_End

__Vectors_Size  EQU     __Vectors_End - __Vectors

                AREA    |.text|, CODE, READONLY

; Reset Handler

NRF_POWER_RAMON_ADDRESS              EQU   0x40000524  ; NRF_POWER->RAMON address
NRF_POWER_RAMONB_ADDRESS             EQU   0x40000554  ; NRF_POWER->RAMONB address
NRF_POWER_RAMONx_RAMxON_ONMODE_Msk   EQU   0x3         ; All RAM blocks on in onmode bit mask

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  SystemInit
                IMPORT  __main

                                MOVS    R1, #NRF_POWER_RAMONx_RAMxON_ONMODE_Msk
                
                LDR     R0, =NRF_POWER_RAMON_ADDRESS
                LDR     R2, [R0]
                ORRS    R2, R2, R1
                STR     R2, [R0]
                
                LDR     R0, =NRF_POWER_RAMONB_ADDRESS
                LDR     R2, [R0]
                ORRS    R2, R2, R1
                STR     R2, [R0]

                LDR     R0, =SystemInit
                BLX     R0
                LDR     R0, =__main
                BX      R0
                ENDP

; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler     PROC
                EXPORT  NMI_Handler               [WEAK]
                B       .
                ENDP
HardFault_Handler\
                PROC
                EXPORT  HardFault_Handler         [WEAK]
                B       .
                ENDP
SVC_Handler     PROC
                EXPORT  SVC_Handler               [WEAK]
                B       .
                ENDP
PendSV_Handler  PROC
                EXPORT  PendSV_Handler            [WEAK]
                B       .
                ENDP
SysTick_Handler PROC
                EXPORT  SysTick_Handler           [WEAK]
                B       .
                ENDP

Default_Handler PROC

                EXPORT   POWER_CLOCK_IRQHandler [WEAK]
                EXPORT   RADIO_IRQHandler [WEAK]
                EXPORT   UART0_IRQHandler [WEAK]
                EXPORT   SPI0_TWI0_IRQHandler [WEAK]
                EXPORT   SPI1_TWI1_IRQHandler [WEAK]
                EXPORT   GPIOTE_IRQHandler [WEAK]
                EXPORT   ADC_IRQHandler [WEAK]
                EXPORT   TIMER0_IRQHandler [WEAK]
                EXPORT   TIMER1_IRQHandler [WEAK]
                EXPORT   TIMER2_IRQHandler [WEAK]
                EXPORT   RTC0_IRQHandler [WEAK]
                EXPORT   TEMP_IRQHandler [WEAK]
                EXPORT   RNG_IRQHandler [WEAK]
                EXPORT   ECB_IRQHandler [WEAK]
                EXPORT   CCM_AAR_IRQHandler [WEAK]
                EXPORT   WDT_IRQHandler [WEAK]
                EXPORT   RTC1_IRQHandler [WEAK]
                EXPORT   QDEC_IRQHandler [WEAK]
                EXPORT   LPCOMP_IRQHandler [WEAK]
                EXPORT   SWI0_IRQHandler [WEAK]
                EXPORT   SWI1_IRQHandler [WEAK]
                EXPORT   SWI2_IRQHandler [WEAK]
                EXPORT   SWI3_IRQHandler [WEAK]
                EXPORT   SWI4_IRQHandler [WEAK]
                EXPORT   SWI5_IRQHandler [WEAK]
POWER_CLOCK_IRQHandler
RADIO_IRQHandler
UART0_IRQHandler
SPI0_TWI0_IRQHandler
SPI1_TWI1_IRQHandler
GPIOTE_IRQHandler
ADC_IRQHandler
TIMER0_IRQHandler
TIMER1_IRQHandler
TIMER2_IRQHandler
RTC0_IRQHandler
TEMP_IRQHandler
RNG_IRQHandler
ECB_IRQHandler
CCM_AAR_IRQHandler
WDT_IRQHandler
RTC1_IRQHandler
QDEC_IRQHandler
LPCOMP_IRQHandler
SWI0_IRQHandler
SWI1_IRQHandler
SWI2_IRQHandler
SWI3_IRQHandler
SWI4_IRQHandler
SWI5_IRQHandler
                B .
                ENDP
                ALIGN

; User Initial Stack & Heap

                IF      :DEF:__MICROLIB

                EXPORT  __initial_sp
                EXPORT  __heap_base
                EXPORT  __heap_limit

                ELSE

                IMPORT  __use_two_region_memory
                EXPORT  __user_initial_stackheap

__user_initial_stackheap PROC

                LDR     R0, = Heap_Mem
                LDR     R1, = (Stack_Mem + Stack_Size)
                LDR     R2, = (Heap_Mem + Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR
                ENDP

                ALIGN

                ENDIF

                END