Function my_get_stack_pointer

include/my_stack_alloc.h:34–78

*/

static inline void *my_get_stack_pointer(void *default_stack)
{
  void *stack_ptr= NULL;

#if defined(__GNUC__) || defined(__clang__) /* GCC and Clang compilers */
#if defined(__i386__) /* Intel x86 (32-bit) */
  __asm__ volatile ("movl %%esp, %0" : "=r" (stack_ptr));
#elif defined(__x86_64__) && defined (__ILP32__) /* Intel x86-64 (64-bit), X32 ABI */
  __asm__ volatile ("movl %%esp, %0" : "=r" (stack_ptr));
#elif defined(__x86_64__) /* Intel x86-64 (64-bit) */
  __asm__ volatile ("movq %%rsp, %0" : "=r" (stack_ptr));
#elif defined(__powerpc__) /* PowerPC (32-bit) */
  __asm__ volatile ("mr %0, 1" : "=r" (stack_ptr)); /* GPR1 is the stack pointer */
#elif defined(__ppc64__) /* PowerPC (64-bit) */
  __asm__ volatile ("mr %0, 1" : "=r" (stack_ptr));
#elif defined(__arm__) /* ARM 32-bit */
  __asm__ volatile ("mov %0, sp" : "=r" (stack_ptr));
#elif defined(__aarch64__) /* ARM 64-bit */
  __asm__ volatile ("mov %0, sp" : "=r" (stack_ptr));
#elif defined(__sparc__) /* SPARC 32-bit */
  __asm__ volatile ("mov %%sp, %0" : "=r" (stack_ptr));
#elif defined(__sparc64__) /* SPARC 64-bit */
  __asm__ volatile ("mov %%sp, %0" : "=r" (stack_ptr));
#elif defined(__s390x__)
  stack_ptr= __builtin_frame_address(0);
#else
  /* Generic fallback for unsupported architectures in GCC/Clang */
  stack_ptr= default_stack ? default_stack : (void*) &stack_ptr;
#endif
#elif defined(_MSC_VER) /* MSVC compiler (Intel only) */
#if defined(_M_IX86) /* Intel x86 (32-bit) */
  __asm { mov stack_ptr, esp }
#elif defined(_M_X64) /* Intel x86-64 (64-bit) */
  /* rsp can’t be accessed directly in MSVC x64 */
  stack_ptr= _AddressOfReturnAddress();
#else
  /* Generic fallback for unsupported architectures in MSVC */
  stack_ptr= default_stack ? default_stack : (void*) &stack_ptr;
#endif
#else
  /* Generic fallback for unsupported compilers */
  stack_ptr= default_stack ? default_stack : (void*) &stack_ptr;
#endif
  return stack_ptr;
}


/*