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Hi, I wanted to know is there away to simulate data abort handler in cortex M4, I wanted to run some bin images from third party libraries, so I wanted to capture the data access to certain memory areas and replace the required answers to them to some custom error data that I want.
Some foundational skills would help significantly. Basic file manipulation via fopen, fseek, fread, fwrite, fclose, etc Object file formats, working understanding of .BIN, .HEX and .ELF/AXF Use of a Hex Editor Use of a Object File Disassembler, like FromELF Basic understanding of assembler and opcodes, or machine code
I did these types of things as a teenager before the internet, so can't be that hard today. If you are truly interested in such things it really doesn't need to be a spoon-feeding exercise where others explain all the details.
I have managed to trap the memfault, but if I try to use it more than once, the next time I access the violaing memory, it would generate hardfault!!!
See the code
#include "LPC43xx.h" // Device header int i=0; int main(void) { static int test; MPU->RNR = 0;//indicate MPU region 0 MPU->RBAR = 0x00000000; // update the base address for the region 0 MPU->RASR = 0x0307003F; test = MPU->RASR; MPU->RNR = 6; MPU->RBAR = 0x20080000; // update the base address for the region 6 MPU->RASR = 0x0007001B; i = MPU->RASR; SCB->SHCSR |=(1<<16); //Enable Memory management fault MPU->CTRL |= 1;//enable MPU for(i=0;i<10;i++) { test = (*(unsigned int *)0x20080000); } while(1) { i++; } } __asm void __setPsp(); int value; void HardFault_Handler (void) { int r1; value=r1; __setPsp(); } __asm void __setPsp() { add r13,32 ldr r14,[r13] add r14,#2 mov r0,#0 MSR IPSR,r0 mov r15,r14 } void MemManage_Handler(void) { __setPsp(); }
Isn't it suppose to generate memfault again?