295 lines
9.0 KiB
ArmAsm
295 lines
9.0 KiB
ArmAsm
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/******************************************************************//**
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* @file start_gcc.S
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* @brief Context switch functions
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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* @author onelife
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* @version 0.4 beta
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**********************************************************************
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* @section License
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* The license and distribution terms for this file may be found in the file LICENSE in this
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* distribution or at http://www.rt-thread.org/license/LICENSE
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**********************************************************************
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* @section Change Logs
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* Date Author Notes
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* 2010-12-21 onelife Initial creation for EFM32
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*********************************************************************/
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/******************************************************************//**
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* @addtogroup cortex-m3
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* @{
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*********************************************************************/
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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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/* 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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*
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* The minimal vector table for a Cortex M3. Note that the proper constructs
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* must be placed on this to ensure that it ends up at physical address
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* 0x0000.0000.
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*
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******************************************************************************/
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.section .isr_vector, "a", %progbits
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.global g_pfnVectors
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.type g_pfnVectors, %object
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g_pfnVectors:
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.word Initial_spTop
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.word Reset_Handler
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.word NMI_Handler
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.word rt_hw_hard_fault
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.word MemManage_Handler
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.word BusFault_Handler
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.word UsageFault_Handler
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.word 0
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.word 0
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.word 0
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.word 0
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.word SVC_Handler
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.word DebugMon_Handler
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.word 0
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.word rt_hw_pend_sv
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.word rt_hw_timer_handler
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/* External Interrupts */
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.word DMA_IRQHandler /* 0: DMA Interrupt (efm32_dma.c) */
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.word GPIO_EVEN_IRQHandler /* 1: GPIO_EVEN Interrupt */
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.word TIMER0_IRQHandler /* 2: TIMER0 Interrupt */
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.word USART0_RX_IRQHandler /* 3: USART0_RX Interrupt */
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.word USART0_TX_IRQHandler /* 4: USART0_TX Interrupt */
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.word ACMP0_IRQHandler /* 5: ACMP0 Interrupt */
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.word ADC0_IRQHandler /* 6: ADC0 Interrupt */
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.word DAC0_IRQHandler /* 7: DAC0 Interrupt */
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.word I2C0_IRQHandler /* 8: I2C0 Interrupt */
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.word GPIO_ODD_IRQHandler /* 9: GPIO_ODD Interrupt */
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.word TIMER1_IRQHandler /* 10: TIMER1 Interrupt */
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.word TIMER2_IRQHandler /* 11: TIMER2 Interrupt */
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.word USART1_RX_IRQHandler /* 12: USART1_RX Interrupt */
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.word USART1_TX_IRQHandler /* 13: USART1_TX Interrupt */
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.word USART2_RX_IRQHandler /* 14: USART2_RX Interrupt */
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.word USART2_TX_IRQHandler /* 15: USART2_TX Interrupt */
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.word UART0_RX_IRQHandler /* 16: UART0_RX Interrupt */
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.word UART0_TX_IRQHandler /* 17: UART0_TX Interrupt */
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.word LEUART0_IRQHandler /* 18: LEUART0 Interrupt */
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.word LEUART1_IRQHandler /* 19: LEUART1 Interrupt */
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.word LETIMER0_IRQHandler /* 20: LETIMER0 Interrupt */
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.word PCNT0_IRQHandler /* 21: PCNT0 Interrupt */
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.word PCNT1_IRQHandler /* 22: PCNT1 Interrupt */
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.word PCNT2_IRQHandler /* 23: PCNT2 Interrupt */
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.word RTC_IRQHandler /* 24: RTC Interrupt */
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.word CMU_IRQHandler /* 25: CMU Interrupt */
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.word VCMP_IRQHandler /* 26: VCMP Interrupt */
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.word LCD_IRQHandler /* 27: LCD Interrupt */
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.word MSC_IRQHandler /* 28: MSC Interrupt */
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.word AES_IRQHandler /* 29: AES Interrupt */
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.size g_pfnVectors, .-g_pfnVectors
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/**
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* @brief Top of stack pointer
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*/
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.section .bss.init
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.equ Stack_Size, 0x00000200
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.space Stack_Size
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Initial_spTop:
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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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.thumb
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.thumb_func
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.section .text.Reset_Handler, "ax", %progbits
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.weak Reset_Handler
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.global Reset_Handler
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.type Reset_Handler, %function
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Reset_Handler:
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/* restore original stack pointer */
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ldr r0, =Initial_spTop
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msr msp, r0
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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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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 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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.thumb
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.thumb_func
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.section .text.Default_Handler, "ax", %progbits
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.global Default_Handler
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.type Default_Handler, %function
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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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/*******************************************************************************
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*
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* Provide weak aliases for each Exception handler to the Default_Handler.
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* As they are weak aliases, any function with the same name will override
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* this definition.
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*
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*******************************************************************************/
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.weak NMI_Handler
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.thumb_set NMI_Handler, Default_Handler
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.weak MemManage_Handler
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.thumb_set MemManage_Handler, Default_Handler
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.weak BusFault_Handler
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.thumb_set BusFault_Handler, Default_Handler
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.weak UsageFault_Handler
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.thumb_set UsageFault_Handler, Default_Handler
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.weak SVC_Handler
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.thumb_set SVC_Handler, Default_Handler
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.weak DebugMon_Handler
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.thumb_set DebugMon_Handler ,Default_Handler
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.weak DMA_IRQHandler
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.thumb_set DMA_IRQHandler, Default_Handler
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.weak GPIO_EVEN_IRQHandler
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.thumb_set GPIO_EVEN_IRQHandler, Default_Handler
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.weak TIMER0_IRQHandler
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.thumb_set TIMER0_IRQHandler, Default_Handler
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.weak USART0_RX_IRQHandler
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.thumb_set USART0_RX_IRQHandler, Default_Handler
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.weak USART0_TX_IRQHandler
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.thumb_set USART0_TX_IRQHandler, Default_Handler
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.weak ACMP0_IRQHandler
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.thumb_set ACMP0_IRQHandler, Default_Handler
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.weak ADC0_IRQHandler
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.thumb_set ADC0_IRQHandler, Default_Handler
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.weak DAC0_IRQHandler
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.thumb_set DAC0_IRQHandler, Default_Handler
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.weak I2C0_IRQHandler
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.thumb_set I2C0_IRQHandler, Default_Handler
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.weak GPIO_ODD_IRQHandler
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.thumb_set GPIO_ODD_IRQHandler, Default_Handler
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.weak TIMER1_IRQHandler
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.thumb_set TIMER1_IRQHandler, Default_Handler
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.weak TIMER2_IRQHandler
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.thumb_set TIMER2_IRQHandler, Default_Handler
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.weak USART1_RX_IRQHandler
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.thumb_set USART1_RX_IRQHandler, Default_Handler
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.weak USART1_TX_IRQHandler
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.thumb_set USART1_TX_IRQHandler, Default_Handler
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.weak USART2_RX_IRQHandler
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.thumb_set USART2_RX_IRQHandler, Default_Handler
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.weak USART2_TX_IRQHandler
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.thumb_set USART2_TX_IRQHandler, Default_Handler
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.weak UART0_RX_IRQHandler
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.thumb_set UART0_RX_IRQHandler, Default_Handler
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.weak UART0_TX_IRQHandler
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.thumb_set UART0_TX_IRQHandler, Default_Handler
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.weak LEUART0_IRQHandler
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.thumb_set LEUART0_IRQHandler, Default_Handler
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.weak LEUART1_IRQHandler
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.thumb_set LEUART1_IRQHandler, Default_Handler
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.weak LETIMER0_IRQHandler
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.thumb_set LETIMER0_IRQHandler, Default_Handler
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.weak PCNT0_IRQHandler
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.thumb_set PCNT0_IRQHandler, Default_Handler
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.weak PCNT1_IRQHandler
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.thumb_set PCNT1_IRQHandler, Default_Handler
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.weak PCNT2_IRQHandler
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.thumb_set PCNT2_IRQHandler, Default_Handler
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.weak RTC_IRQHandler
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.thumb_set RTC_IRQHandler, Default_Handler
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.weak CMU_IRQHandler
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.thumb_set CMU_IRQHandler, Default_Handler
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.weak VCMP_IRQHandler
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.thumb_set VCMP_IRQHandler, Default_Handler
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.weak LCD_IRQHandler
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.thumb_set LCD_IRQHandler, Default_Handler
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.weak MSC_IRQHandler
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.thumb_set MSC_IRQHandler, Default_Handler
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.weak AES_IRQHandler
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.thumb_set AES_IRQHandler, Default_Handler
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/******************************************************************//**
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* @}
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*********************************************************************/
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