Memcpy

Hi Pavitra,

Can you be more specific about what problem you are seeing? Perhaps you could post your code segment and the output from the simulation?

Chris

Hi Chris,

I have taken the  following example from the Bare-metal_examples.zip  provided by ARM  DS-5 : "startup_Cortex-A8" for simulation on ARM-DS5. Then added few lines of extra code which includes memcpy() in sorts.c (attached), with which I was ...as able to simulate properly.  Later Ive  added few more files for the above ARM supplied project and changed "scatter.scat" which has been named as ( scatter_modified.scat ,attached ). So now  the same piece of code containing memcpy is crashing when the execution is encountering  that particular line containing memcpy.

Before  memcpy  is encountered in the code

memcpy(pCurrLoc, pLeftLoc, sizeof (MY_STR));--------------------> Added by me

Both  src and dest pointers are of same type

  MY_STR *pCurrLoc;

  MY_STR *pLeftLoc;

My destination pointer pCurrLoc  is  at  0x0014 B1A4

My source pointer        pLeftLoc  is at    0x0014 B183

Length of both the source and destination is  33 bytes.

Im hereby attaching the code also.

Thanks and Regards

Pavitra

Had you enabled the compiler option --no_unaligned_access ?

Also try using strcpy() instead of memcpy(). I believe the length you had specified copies one byte lesser than actual string copy.

I haven't had time to analyse your code properly but it looks to me as if strings and strings_copy are not initialised before you use them. Check this first.

Chrish,

      Below is the code added by me and the one which is giving problem. Rest of the  code is the example code ( strings and strings_copy ara already in the example)

int nParts = 28;

    int location = 4;

    MY_STR *pBase;

    MY_STR *pCurrLoc;

    MY_STR *pLeftLoc;

    pBase = (MY_STR *) malloc(nParts * sizeof (MY_STR));

    if (pBase == NULL)

    {

        printf("\n Failed to allocate memory for pBase of type MY_STR in file sorts.c \n");

        return -1;

    }

    pCurrLoc = &pBase[ location ];

    pLeftLoc = &pBase[ location - 1 ];

    memcpy(pCurrLoc, pLeftLoc, sizeof (MY_STR));--------------------> Added by me

Pls try to  help me out  reg this???

Ofcourse it is. Im using the unaligned data only.

Thanks for posting the code. Are you able to say what error occurs when you try to run it?

Chris,

   When my code is encountering the line containing memcpy, its going to infinite loop( THE ERROR : NO STACK) and getting crashed.

Thx

Pavitra

Is the address returned by malloc valid on your platform? Have you correctly configured the heap in the C library init routine?

Peter,

   Yes, the address returned by malloc is perfectly valid and it is working fine when I initially added small piece of code, but later when 've added few more files and also I've modified the scatter file as below and configured the heap here.

  APP_DATA +0

  {

        * (+RW, +ZI)            ; Application RW (.data) and ZI (.bss) data

    }

  ARM_LIB_HEAP  0x00040000 EMPTY  0x05FC0000 ; Application heap

  { }

  ARM_LIB_STACK 0x07000000 EMPTY -0x01000000 ; Application (SVC mode) stack

  { }

  IRQ_STACK     0x08000000 EMPTY -0x01000000 ; IRQ mode stack

  { }

  TTB     0x09000000 EMPTY 0x40000            ; Level-1 Translation Table for MMU

  { }

}

Hi Pavi,

Kindly use the option --no_unaligned_access in the compiler option and run it.

Hi, did your issue get resolved with the compiler option?