How to read physical memory

From: Tomas Kratochvil (tkra_at_duhasys.cz)
Date: 11/25/04

  • Next message: Marco Cavallini: "Re: How to read physical memory" 
    Date: 25 Nov 2004 07:03:57 -0800

    Hello,
      could you help me? I need utility or part of code which read part of
    physical memory in non kernel mode.
      I wrote this :
     
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <fcntl.h>
    #include <sys/mman.h>

    int main()
    {
       FILE* fd = fopen("/dev/mem","r");
       unsigned int i;
       unsigned int base;
       char c[4];
       if (fd == 0)
         printf("Error while opening /dev/mem\n");
       
       base = 0x40d00010;

       fseek(fd, SEEK_SET, base);
       
       for (i = 0; i < 16*4; i+=4) {
         fread(&c,4,1,fd);
         printf("addr[%2X]=0x%.2X %.2X %.2X
    %.2X\n",base+i,c[0],c[1],c[2],c[3]);
       }
       
       return 0;
    }

    But i cannot read /dev/mem on my device because /dev/mem doesn't work
    (cat /dev/mem cause segmentation fault). Is there any other
    possibility how do these. (ioctl)

    Thank you

    Tomas

  • Next message: Marco Cavallini: "Re: How to read physical memory"

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