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80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//! Initial firmware startup, contains the vector table that the bootloader loads.
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//! Based on "https://github.com/pfalcon/cortex-uni-startup/blob/master/startup.c"
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//! by Paul Sokolovsky (public domain)
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include "util/attributes.h"
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//! These symbols are defined in the linker script for use in initializing
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//! the data sections. uint8_t since we do arithmetic with section lengths.
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//! These are arrays to avoid the need for an & when dealing with linker symbols.
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extern uint8_t __data_load_start[];
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extern uint8_t __data_start[];
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extern uint8_t __data_end[];
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extern uint8_t __bss_start[];
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extern uint8_t __bss_end[];
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extern uint8_t _estack[];
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//! Bootloader entry point, ResetHandler calls this
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extern int boot_main(void);
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//! STM32 system initialization function, defined in the standard peripheral library
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extern void SystemInit(void);
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//! We don't use any interrupts in the bootloader so we map the core interrupts to
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//! the HardFault_Handler to get useful debugging info if something goes wrong
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extern void HardFault_Handler(void);
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//! This function is what gets called when the processor first
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//! starts execution following a reset event. The data and bss
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//! sections are initialized, then we call the firmware's main
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//! function
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void Reset_Handler(void) {
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// Copy data section from flash to RAM
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memcpy(__data_start, __data_load_start, __data_end - __data_start);
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// Clear the bss section, assumes .bss goes directly after .data
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memset(__bss_start, 0, __bss_end - __bss_start);
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boot_main();
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// Main shouldn't return
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while (true) {}
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}
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EXTERNALLY_VISIBLE SECTION(".isr_vector") void *vector_table[] = {
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_estack,
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Reset_Handler,
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HardFault_Handler,
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HardFault_Handler,
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HardFault_Handler,
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HardFault_Handler,
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HardFault_Handler,
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0,
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0,
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0,
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0,
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HardFault_Handler,
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HardFault_Handler,
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0,
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HardFault_Handler,
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HardFault_Handler
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};
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