espmaniac/elf_loader

CPU panic'ed when the function was used in the elf but not relocated in the main program

Closed this issue · 5 comments

DynamicLoader commented

Hi,
I'm trying this library.What a good library you have made!

But I found something wrong.As is said in the title,
I tried the program below,

#include <stdio.h>
#include <stdint.h>

int delay(size_t millsec);

uint32_t local_main(uint32_t arg) {
    for(int i=0;i<20;i++){
        printf("Hello world!\n");
        printf("It works for %i times!\n",i);
        delay(3000);
    }
    return 0;
}

As you can see,I used a external function "delay()",but when I do NOT add an implement to the relocate table,the CPU panic'ed.

The host program is below:

#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <stdio.h>
#include "loader.hpp"
#include "Program.h"

extern "C" void delay(size_t microsec){
  TickType_t xDelay = microsec / portTICK_PERIOD_MS;
  vTaskDelay(xDelay);
}

extern "C" void app_main() {
  ElfLoader test((void*)Program, {
    {"puts", (void*) puts},
    { "printf", (void*) printf },
    { "delay",(void*) delay }
  });
  test.parse();
  if(test.relocate()==0){
    ((void (*) ())test.getEntryPoint())();
  }else{
    printf("Cannot load ELF file!\n");
  }
}

Could anyone help me,please?
Thanks.

espmaniac commented

Hello, I have tested your program. I am sure that the problem is with the elf file loader. I will try to solve it as quickly as I can.

espmaniac commented

Note that the delay function is of different types. You have void type in one file and int type in another.

espmaniac commented

I found the reason for the panic. The entry point pointer is wrong. I have already solved the problem, but I need to run more tests before I post the solution

DynamicLoader commented
espmaniac commented

I have tested your program with the updated loader. The program works without errors.