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96 lines
2.9 KiB
C
96 lines
2.9 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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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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extern int main(void);
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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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__attribute__((__noreturn__)) void Reset_Handler(void) {
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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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main();
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__builtin_unreachable();
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}
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__attribute__((__noreturn__)) void Default_Handler(void) {
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// This handler is only called if we haven't defined a specific
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// handler for the interrupt. This means the interrupt is unexpected,
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// so we loop infinitely to preserve the system state for examination
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// by a debugger
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while (true) {}
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}
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// All these functions are weak references to the Default_Handler,
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// so if we define a handler in elsewhere in the firmware, these
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// will be overriden
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#define ALIAS(sym) __attribute__((__weak__, __alias__(sym)))
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ALIAS("Default_Handler") void NMI_Handler(void);
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ALIAS("Default_Handler") void HardFault_Handler(void);
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ALIAS("Default_Handler") void MemManage_Handler(void);
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ALIAS("Default_Handler") void BusFault_Handler(void);
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ALIAS("Default_Handler") void UsageFault_Handler(void);
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ALIAS("Default_Handler") void SVC_Handler(void);
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ALIAS("Default_Handler") void DebugMon_Handler(void);
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ALIAS("Default_Handler") void PendSV_Handler(void);
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ALIAS("Default_Handler") void SysTick_Handler(void);
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// External Interrupts
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#define IRQ_DEF(idx, irq) ALIAS("Default_Handler") void irq##_IRQHandler(void);
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#include "irq_stm32f7.def"
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#undef IRQ_DEF
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__attribute__((__section__(".isr_vector"))) const void * const vector_table[] = {
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_estack,
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Reset_Handler,
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NMI_Handler,
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HardFault_Handler,
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MemManage_Handler,
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BusFault_Handler,
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UsageFault_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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SVC_Handler,
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DebugMon_Handler,
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0,
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PendSV_Handler,
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SysTick_Handler,
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// External Interrupts
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#define IRQ_DEF(idx, irq) [idx + 16] = irq##_IRQHandler,
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#include "irq_stm32f7.def"
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#undef IRQ_DEF
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};
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