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88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/*
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* cm3_fault_handlers.c
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*
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* Created on: Apr 24, 2011
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* Author: msmith
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*/
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#include <stdint.h>
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#include "dcc_stdio.h"
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#ifdef STM32F4XX
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# include "stm32f4xx.h"
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#endif
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#ifdef STM32F2XX
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# include "stm32f2xx.h"
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#endif
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#define FAULT_TRAMPOLINE(_vec) \
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__attribute__((naked, no_instrument_function)) \
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void \
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_vec##_Handler(void) \
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{ \
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__asm( ".syntax unified\n" \
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"MOVS R0, #4 \n" \
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"MOV R1, LR \n" \
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"TST R0, R1 \n" \
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"BEQ 1f \n" \
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"MRS R0, PSP \n" \
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"B " #_vec "_Handler2 \n" \
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"1: \n" \
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"MRS R0, MSP \n" \
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"B " #_vec "_Handler2 \n" \
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".syntax divided\n"); \
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} \
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struct hack
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struct cm3_frame {
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uint32_t r0;
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uint32_t r1;
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uint32_t r2;
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uint32_t r3;
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uint32_t r12;
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uint32_t lr;
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uint32_t pc;
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uint32_t psr;
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};
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FAULT_TRAMPOLINE(HardFault);
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FAULT_TRAMPOLINE(BusFault);
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FAULT_TRAMPOLINE(UsageFault);
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/* this is a hackaround to avoid an issue where dereferencing SCB seems to result in bad codegen and a link error */
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#define SCB_REG(_reg) (*(uint32_t *)&(SCB->_reg))
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void
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HardFault_Handler2(struct cm3_frame *frame)
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{
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dbg_write_str("\nHARD FAULT");
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dbg_write_hex32(frame->pc);
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dbg_write_char('\n');
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dbg_write_hex32(SCB_REG(HFSR));
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dbg_write_char('\n');
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for (;;);
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}
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void
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BusFault_Handler2(struct cm3_frame *frame)
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{
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dbg_write_str("\nBUS FAULT");
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dbg_write_hex32(frame->pc);
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dbg_write_char('\n');
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dbg_write_hex32(SCB_REG(CFSR));
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dbg_write_char('\n');
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dbg_write_hex32(SCB_REG(BFAR));
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dbg_write_char('\n');
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for (;;);
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}
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void
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UsageFault_Handler2(struct cm3_frame *frame)
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{
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dbg_write_str("\nUSAGE FAULT");
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dbg_write_hex32(frame->pc);
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dbg_write_char('\n');
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dbg_write_hex32(SCB_REG(CFSR));
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dbg_write_char('\n');
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for (;;);
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}
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