/* * Copyright (c) 2022 OpenLuat & AirM2M * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of * the Software, and to permit persons to whom the Software is furnished to do so, * subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ .syntax unified .cpu cortex-m4 .fpu softvfp .thumb .global g_pfnVectors .global HardFault_Handler /* start address for the initialization values of the .data section. defined in linker script */ .word _sidata /* start address for the .data section. defined in linker script */ .word _sdata /* end address for the .data section. defined in linker script */ .word _edata /* start address for the .bss section. defined in linker script */ .word _sbss /* end address for the .bss section. defined in linker script */ .word _ebss /* stack used for SystemInit_ExtMemCtl; always internal RAM used */ .word _sitext .word _sstext .word _setext /** * @brief This is the code that gets called when the processor first * starts execution following a reset event. Only the absolutely * necessary set is performed, after which the application * supplied main() routine is called. * @param None * @retval : None */ .section .text.Reset_Handler .weak Reset_Handler .type Reset_Handler, %function Reset_Handler: movs r0, #0 movs r1, #0 movs r2, #0 movs r3, #0 movs r4, #0 movs r5, #0 movs r6, #0 movs r7, #0 LDR R0, =g_pfnVectors LDR R1, =0xE000ED08 STR R0,[R1] ldr sp, =_estack /* set stack pointer */ /* Copy the data segment initializers from flash to SRAM */ movs r1, #0 b LoopCopyTextInit CopyTextInit: ldr r3, =_sitext ldr r3, [r3, r1] str r3, [r0, r1] adds r1, r1, #4 LoopCopyTextInit: ldr r0, =_sstext ldr r3, =_setext adds r2, r0, r1 cmp r2, r3 bcc CopyTextInit movs r1, #0 b LoopCopyDataInit CopyDataInit: ldr r3, =_sidata ldr r3, [r3, r1] str r3, [r0, r1] adds r1, r1, #4 LoopCopyDataInit: ldr r0, =_sdata ldr r3, =_edata adds r2, r0, r1 cmp r2, r3 bcc CopyDataInit ldr r2, =_sbss b LoopFillZerobss /* Zero fill the bss segment. */ FillZerobss: movs r3, #0 str r3, [r2], #4 LoopFillZerobss: ldr r3, = _ebss cmp r2, r3 bcc FillZerobss /* Call the clock system intitialization function.*/ bl SystemInit /* Call static constructors */ bl __libc_init_array /*目前看来这个没什么用，如果代码量有超可以去掉*/ /* Call the application's entry point.*/ bl main bx lr .size Reset_Handler, .-Reset_Handler /** * @brief This is the code that gets called when the processor receives an * unexpected interrupt. This simply enters an infinite loop, preserving * the system state for examination by a debugger. * @param None * @retval None */ .section .text.Default_Handler,"ax",%progbits Default_Handler: Infinite_Loop: b Infinite_Loop .size Default_Handler, .-Default_Handler /****************************************************************************** * * The minimal vector table for a Cortex M3. Note that the proper constructs * must be placed on this to ensure that it ends up at physical address * 0x0000.0000. * *******************************************************************************/ .section .isr_vector,"a",%progbits .type g_pfnVectors, %object .size g_pfnVectors, .-g_pfnVectors g_pfnVectors: .word _estack .word Reset_Handler .word NMI_Handler .word HardFault_Handler .word MemManage_Handler .word BusFault_Handler .word UsageFault_Handler .word 0 .word 0 .word 0 .word 0 .word SVC_Handler .word DebugMon_Handler .word 0 .word PendSV_Handler .word SysTick_Handler /* External Interrupts */ .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler .word ISR_GlobalHandler /******************************************************************************* * * Provide weak aliases for each Exception handler to the Default_Handler. * As they are weak aliases, any function with the same name will override * this definition. * *******************************************************************************/ .weak NMI_Handler .thumb_set NMI_Handler,Default_Handler .section .text.CmTrace_Handler .type CmTrace_Handler, %function CmTrace_Handler: MOV r0, lr /* get lr */ MOV r1, sp /* get stack pointer (current is MSP) */ BL cm_backtrace_fault Fault_Loop: BL Fault_Loop /* while(1) */ .weak NMI_Handler .thumb_set NMI_Handler,CmTrace_Handler .weak HardFault_Handler .thumb_set HardFault_Handler,CmTrace_Handler .weak MemManage_Handler .thumb_set MemManage_Handler,CmTrace_Handler .weak BusFault_Handler .thumb_set BusFault_Handler,CmTrace_Handler .weak UsageFault_Handler .thumb_set UsageFault_Handler,CmTrace_Handler .weak SVC_Handler .thumb_set SVC_Handler,Default_Handler .weak DebugMon_Handler .thumb_set DebugMon_Handler,Default_Handler .weak PendSV_Handler .thumb_set PendSV_Handler,Default_Handler .weak SysTick_Handler .thumb_set SysTick_Handler,Default_Handler .weak ISR_GlobalHandler .thumb_set ISR_GlobalHandler,Default_Handler