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C Programming and pointer sizes on ARM processors.

asp

Hi,

I've a question regarding C programming on ARM processors. can I ALWAYS assume that the sizeof(function_pointers) == sizeof(void *) == sizeof(char *)? Also I read in a blog (Caches and Self-Modifying Code) that "ARM architecture is often considered to be a Modified Harvard Architecture" does this mean the instructions are placed in a different memory space than the data memory space?  If so again how can we guarantee the sizeof (function_pointer) == sizeof(data_pointer)?

Thanks.

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  • 0

    Hi asp,

    do you want to make the self-modify-code? If it is so, you can use the type casting of the function and data pointers each other.

    volatile void (*func)();
volatile char *dat;
main()
{
  func = (volatile void (*)())dat;
  dat = (volatile char*)func;
}


    Best regards,
    Yasuhiko Koumoto.

Reply
  • 0

    Hi asp,

    do you want to make the self-modify-code? If it is so, you can use the type casting of the function and data pointers each other.

    volatile void (*func)();
volatile char *dat;
main()
{
  func = (volatile void (*)())dat;
  dat = (volatile char*)func;
}


    Best regards,
    Yasuhiko Koumoto.

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