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189 lines
5.4 KiB
ArmAsm
189 lines
5.4 KiB
ArmAsm
/**
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******************************************************************************
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* @file startup_stm32f2xx.s
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* @author MCD Application Team / Michael Smith: Vector table for FreeRTOS
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* @version V0.1
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* @date 03/24/2011
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* @brief STM32F2xx High Density Devices vector table for GCC toolchain.
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* Derived from startup_stm32f10x_HD_OP.s
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*
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* This module performs:
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* - Set the initial SP
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* - Set the initial PC == Reset_Handler,
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* - Set the vector table entries with the exceptions ISR address
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* - Configure the clock system and the external SRAM mounted on
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* STM3210E-EVAL board to be used as data memory (optional,
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* to be enabled by user)
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* - Branches to main in the C library (which eventually
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* calls main()).
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* After Reset the Cortex-M3 processor is in Thread mode,
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* priority is Privileged, and the Stack is set to Main.
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*******************************************************************************
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* @copy
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>
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*/
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#include "pios_config.h"
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.syntax unified
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.cpu cortex-m3
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.fpu softvfp
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.thumb
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.global g_pfnVectors
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.global Default_Handler
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.global xPortIncreaseHeapSize
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.global Stack_Change
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/* start address for the initialization values of the .data section.
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defined in linker script */
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.word _sidata
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/* start address for the .data section. defined in linker script */
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.word _sdata
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/* end address for the .data section. defined in linker script */
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.word _edata
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/* start address for the .bss section. defined in linker script */
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.word _sbss
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/* end address for the .bss section. defined in linker script */
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.word _ebss
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/**
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* @brief This is the code that gets called when the processor first
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* starts execution following a reset event. Only the absolutely
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* necessary set is performed, after which the application
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* supplied main() routine is called.
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* @param None
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* @retval : None
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*/
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.section .text.Reset_Handler
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.weak Reset_Handler
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.type Reset_Handler, %function
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Reset_Handler:
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/*
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* From Cortex-M3 reference manual:
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* - Handler IRQ always use SP_main
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* - Process use SP_main or SP_process
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* Here, we will use beginning of SRAM for IRQ (SP_main)
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* and end of heap for initialization (SP_process).
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* Once the schedule starts, all threads will use their own stack
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* from heap and NOBOBY should use SP_process again.
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*/
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/* Do set/reset the stack pointers */
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LDR r0, =_irq_stack_top
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MSR msp, r0
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LDR r2, =_init_stack_top
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MSR psp, r2
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/* check if irq and init stack are the same */
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/* if they are, we don't do stack swap */
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/* and lets bypass the monitoring as well for now */
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cmp r0, r2
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beq SectionBssInit
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/* DO
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* - stay in thread process mode
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* - stay in privilege level
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* - use process stack
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*/
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movs r0, #2
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MSR control, r0
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ISB
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/* Fill IRQ stack for watermark monitoring */
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ldr r2, =_irq_stack_end
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b LoopFillIRQStack
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FillIRQStack:
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movw r3, #0xA5A5
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str r3, [r2], #4
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LoopFillIRQStack:
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ldr r3, = _irq_stack_top
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cmp r2, r3
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bcc FillIRQStack
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SectionBssInit:
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/* Copy the data segment initializers from flash to SRAM */
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movs r1, #0
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b LoopCopyDataInit
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CopyDataInit:
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ldr r3, =_sidata
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ldr r3, [r3, r1]
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str r3, [r0, r1]
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adds r1, r1, #4
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LoopCopyDataInit:
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ldr r0, =_sdata
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ldr r3, =_edata
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adds r2, r0, r1
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cmp r2, r3
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bcc CopyDataInit
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ldr r2, =_sbss
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b LoopFillZerobss
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/* Zero fill the bss segment. */
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FillZerobss:
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movs r3, #0
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str r3, [r2], #4
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LoopFillZerobss:
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ldr r3, = _ebss
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cmp r2, r3
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bcc FillZerobss
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/* Call the application's entry point.*/
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bl main
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/* will never return here */
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bx lr
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.size Reset_Handler, .-Reset_Handler
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/**
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* @brief This is the code that swaps stack (from end of heap to irq_stack).
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* @param None
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* @retval : None
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*/
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.section .text.Stack_Change
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.weak Stack_Change
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.type Stack_Change, %function
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Stack_Change:
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mov r4, lr
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/* Switches stack back momentarily to MSP */
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movs r0, #0
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msr control, r0
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bx r4
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.size Stack_Change, .-Stack_Change
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/**
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* @brief Dummy SystemInit_ExtMemCtl function
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* @param None
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* @retval : None
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*/
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.section .text.SystemInit_ExtMemCtl_Dummy,"ax",%progbits
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SystemInit_ExtMemCtl_Dummy:
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bx lr
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.size SystemInit_ExtMemCtl_Dummy, .-SystemInit_ExtMemCtl_Dummy
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/**
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* @brief This is the code that gets called when the processor receives an
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* unexpected interrupt. This simply enters an infinite loop, preserving
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* the system state for examination by a debugger.
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*
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* @param None
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* @retval : None
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*/
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.section .text.Default_Handler,"ax",%progbits
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Default_Handler:
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Infinite_Loop:
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b Infinite_Loop
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.size Default_Handler, .-Default_Handler
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/* grab the vectors from the standard file */
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#define INITIAL_STACK_TOP _irq_stack_top
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#include "vectors_stm32f2xx.S"
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