108 lines
4.1 KiB
C
108 lines
4.1 KiB
C
/*
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* FreeRTOS V202112.00
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* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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typedef unsigned int uint32_t;
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extern int main();
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extern uint32_t _estack, _sidata, _sdata, _edata, _sbss, _ebss;
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/* Prevent optimization so gcc does not replace code with memcpy */
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__attribute__((optimize("O0"))) __attribute__((naked)) void Reset_Handler(
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void) {
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/* set stack pointer */
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__asm volatile("ldr r0, =_estack");
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__asm volatile("mov sp, r0");
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/* copy .data section from flash to RAM */
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// Not needed for this example, see linker script
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// for( uint32_t * src = &_sidata, * dest = &_sdata; dest < &_edata; )
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// {
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// *dest++ = *src++;
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// }
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/* zero out .bss section */
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for (uint32_t *dest = &_sbss; dest < &_ebss;) {
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*dest++ = 0;
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}
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/* jump to board initialisation */
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void _start(void);
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_start();
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}
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const uint32_t *isr_vector[] __attribute__((section(".isr_vector"))) = {
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(uint32_t *)&_estack,
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(uint32_t *)&Reset_Handler, /* Reset -15 */
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0, /* NMI_Handler -14 */
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0, /* HardFault_Handler -13 */
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0, /* MemManage_Handler -12 */
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0, /* BusFault_Handler -11 */
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0, /* UsageFault_Handler -10 */
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0, /* reserved */
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0, /* reserved */
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0, /* reserved */
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0, /* reserved -6 */
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0, /* SVC_Handler -5 */
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0, /* DebugMon_Handler -4 */
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0, /* reserved */
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0, /* PendSV handler -2 */
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0, /* SysTick_Handler -1 */
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0, /* uart0 receive 0 */
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0, /* uart0 transmit */
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0, /* uart1 receive */
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0, /* uart1 transmit */
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0, /* uart 2 receive */
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0, /* uart 2 transmit */
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0, /* GPIO 0 combined interrupt */
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0, /* GPIO 2 combined interrupt */
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0, /* Timer 0 */
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0, /* Timer 1 */
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0, /* Dial Timer */
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0, /* SPI0 SPI1 */
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0, /* uart overflow 1, 2,3 */
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0, /* Ethernet 13 */
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};
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__attribute__((naked)) void exit(__attribute__((unused)) int status) {
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/* Force qemu to exit using ARM Semihosting */
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__asm volatile(
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"mov r1, r0\n"
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"cmp r1, #0\n"
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"bne .notclean\n"
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"ldr r1, =0x20026\n" /* ADP_Stopped_ApplicationExit, a clean exit */
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".notclean:\n"
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"movs r0, #0x18\n" /* SYS_EXIT */
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"bkpt 0xab\n"
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"end: b end\n");
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}
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void _start(void) {
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main();
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exit(0);
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}
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