Query related to reading current stack poniter DS32K142

sardalkar — Wed, 04 Sep 2019 14:41:07 GMT

We have query related to reading current stack pointer with STS instruction. Below is macro defined to read current SP, but it is giving compilation error (identifier STS is undefined)

#define GET_STACKPOINTER(x) _asm(STS x) Is the STS instruction supports for cortex M4 (DS32k142)?

Please let us know if you have any alternative solution for getting current stack pointer with direct RAM accessible instruction.

Re: Query related to reading current stack poniter DS32K142

victorjimenez — Fri, 06 Sep 2019 16:11:04 GMT

Hello Sandip Ardalkar,

I'm not aware of the macro that you are trying to use. However, I made an example to read the stack pointer on run time with a different approach. The following function returns the value of the stack pointer.

void *GetSP(void)
{
#ifdef __GNUC__
  void *sp;
  __asm__ __volatile__ ("mov %0, sp" : "=r"(sp));
  return sp;
#else
  #warning "only for GCC"
  return NULL;
#endif
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

To call the function I did the following:

  /* Getting SP */
  void* (*vfunc)(void);
  vfunc = GetSP;
  void* StackPointer = vfunc();
  uint32_t sp = (uint32_t)StackPointer;‍‍‍‍‍‍‍‍‍‍

At the end the variable sp will have the value of the stack pointer.

Have a great day,
TIC

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S32 SDKのトピックQuery related to reading current stack poniter DS32K142

Query related to reading current stack poniter DS32K142

Re: Query related to reading current stack poniter DS32K142