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startup_ARMCM4.S
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startup_ARMCM4.S
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/* File: startup_ARMCM4.S
* Purpose: startup file for Cortex-M4 devices. Should use with
* GCC for ARM Embedded Processors
* Version: V2.01
* Date: 12 June 2014
*
*/
/* Copyright (c) 2011 - 2014 ARM LIMITED
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of ARM nor the names of its contributors may be used
to endorse or promote products derived from this software without
specific prior written permission.
*
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------*/
.syntax unified
.arch armv7-m
.section .vectors,"a",%progbits
.align 2
.globl __Vectors
__Vectors:
.long __stack_end__ /* Top of Stack */
.long Reset_Handler /* Reset Handler */
.long NMI_Handler /* NMI Handler */
.long HardFault_Handler /* Hard Fault Handler */
.long MemManage_Handler /* MPU Fault Handler */
.long BusFault_Handler /* Bus Fault Handler */
.long UsageFault_Handler /* Usage Fault Handler */
.long 0 /* Reserved */
.long 0 /* Reserved */
.long 0 /* Reserved */
.long 0 /* Reserved */
.long SVC_Handler /* SVCall Handler */
.long DebugMon_Handler /* Debug Monitor Handler */
.long 0 /* Reserved */
.long PendSV_Handler /* PendSV Handler */
.long SysTick_Handler /* SysTick Handler */
/* External interrupts */
.long WDT_IRQHandler /* 0: Watchdog Timer */
.long RTC_IRQHandler /* 1: Real Time Clock */
.long TIM0_IRQHandler /* 2: Timer0 / Timer1 */
.long TIM2_IRQHandler /* 3: Timer2 / Timer3 */
.long MCIA_IRQHandler /* 4: MCIa */
.long MCIB_IRQHandler /* 5: MCIb */
.long UART0_IRQHandler /* 6: UART0 - DUT FPGA */
.long UART1_IRQHandler /* 7: UART1 - DUT FPGA */
.long UART2_IRQHandler /* 8: UART2 - DUT FPGA */
.long UART4_IRQHandler /* 9: UART4 - not connected */
.long AACI_IRQHandler /* 10: AACI / AC97 */
.long CLCD_IRQHandler /* 11: CLCD Combined Interrupt */
.long ENET_IRQHandler /* 12: Ethernet */
.long USBDC_IRQHandler /* 13: USB Device */
.long USBHC_IRQHandler /* 14: USB Host Controller */
.long CHLCD_IRQHandler /* 15: Character LCD */
.long FLEXRAY_IRQHandler /* 16: Flexray */
.long CAN_IRQHandler /* 17: CAN */
.long LIN_IRQHandler /* 18: LIN */
.long I2C_IRQHandler /* 19: I2C ADC/DAC */
.long 0 /* 20: Reserved */
.long 0 /* 21: Reserved */
.long 0 /* 22: Reserved */
.long 0 /* 23: Reserved */
.long 0 /* 24: Reserved */
.long 0 /* 25: Reserved */
.long 0 /* 26: Reserved */
.long 0 /* 27: Reserved */
.long CPU_CLCD_IRQHandler /* 28: Reserved - CPU FPGA CLCD */
.long 0 /* 29: Reserved - CPU FPGA */
.long UART3_IRQHandler /* 30: UART3 - CPU FPGA */
.long SPI_IRQHandler /* 31: SPI Touchscreen - CPU FPGA */
.size __Vectors, . - __Vectors
.text
.thumb
.thumb_func
.align 2
.globl Reset_Handler
.type Reset_Handler, %function
Reset_Handler:
/* Firstly it copies data from read only memory to RAM. There are two schemes
* to copy. One can copy more than one sections. Another can only copy
* one section. The former scheme needs more instructions and read-only
* data to implement than the latter.
* Macro __STARTUP_COPY_MULTIPLE is used to choose between two schemes. */
/* Single section scheme.
*
* The ranges of copy from/to are specified by following symbols
* __etext: LMA of start of the section to copy from. Usually end of text
* __data_start__: VMA of start of the section to copy to
* __data_end__: VMA of end of the section to copy to
*
* All addresses must be aligned to 4 bytes boundary.
*/
ldr r1, =__etext
ldr r2, =__data_start__
ldr r3, =__data_end__
.L_loop1:
cmp r2, r3
ittt lt
ldrlt r0, [r1], #4
strlt r0, [r2], #4
blt .L_loop1
/* Single BSS section scheme.
*
* The BSS section is specified by following symbols
* __bss_start__: start of the BSS section.
* __bss_end__: end of the BSS section.
*
* Both addresses must be aligned to 4 bytes boundary.
*/
ldr r1, =__bss_start__
ldr r2, =__bss_end__
movs r0, 0
.L_loop3:
cmp r1, r2
itt lt
strlt r0, [r1], #4
blt .L_loop3
bl main
.pool
.size Reset_Handler, . - Reset_Handler
.align 1
.thumb_func
.weak Default_Handler
.type Default_Handler, %function
Default_Handler:
b .
.size Default_Handler, . - Default_Handler
/* Macro to define default handlers. Default handler
* will be weak symbol and just dead loops. They can be
* overwritten by other handlers */
.macro def_irq_handler handler_name
.weak \handler_name
.set \handler_name, Default_Handler
.endm
def_irq_handler NMI_Handler
def_irq_handler HardFault_Handler
def_irq_handler MemManage_Handler
def_irq_handler BusFault_Handler
def_irq_handler UsageFault_Handler
def_irq_handler SVC_Handler
def_irq_handler DebugMon_Handler
def_irq_handler PendSV_Handler
def_irq_handler SysTick_Handler
def_irq_handler WDT_IRQHandler
def_irq_handler RTC_IRQHandler
def_irq_handler TIM0_IRQHandler
def_irq_handler TIM2_IRQHandler
def_irq_handler MCIA_IRQHandler
def_irq_handler MCIB_IRQHandler
def_irq_handler UART0_IRQHandler
def_irq_handler UART1_IRQHandler
def_irq_handler UART2_IRQHandler
def_irq_handler UART3_IRQHandler
def_irq_handler UART4_IRQHandler
def_irq_handler AACI_IRQHandler
def_irq_handler CLCD_IRQHandler
def_irq_handler ENET_IRQHandler
def_irq_handler USBDC_IRQHandler
def_irq_handler USBHC_IRQHandler
def_irq_handler CHLCD_IRQHandler
def_irq_handler FLEXRAY_IRQHandler
def_irq_handler CAN_IRQHandler
def_irq_handler LIN_IRQHandler
def_irq_handler I2C_IRQHandler
def_irq_handler CPU_CLCD_IRQHandler
def_irq_handler SPI_IRQHandler
.end