LibraryHacks.cpp

/*
 * LibraryHacks.cpp
 *
 *  Created on: 23 Jan 2011
 *      Author: Andy
 */

#include <cstdlib>
#include <sys/types.h>


/*
 * The default pulls in 70K of garbage
 */

namespace __gnu_cxx {

  void __verbose_terminate_handler() {
    for(;;);
  }
}


/*
 * The default pulls in about 12K of garbage
 */

extern "C" void __cxa_pure_virtual() {
  for(;;);
}


/*
 * Implement C++ new/delete operators using the heap
 */

void *operator new(size_t size) {
  return malloc(size);
}

void *operator new(size_t,void *ptr) {
  return ptr;
}

void *operator new[](size_t size) {
  return malloc(size);
}

void *operator new[](size_t,void *ptr) {
  return ptr;
}

void operator delete(void *p) {
  free(p);
}

void operator delete[](void *p) {
  free(p);
}


/*
 * EABI builds can generate reams of stack unwind code for system generated exceptions
 * e.g. (divide-by-zero). Since we don't support exceptions we'll wrap out these
 * symbols and save a lot of flash space.
 */

extern "C" void __wrap___aeabi_unwind_cpp_pr0() {}
extern "C" void __wrap___aeabi_unwind_cpp_pr1() {}
extern "C" void __wrap___aeabi_unwind_cpp_pr2() {}


/*
 * sbrk function for getting space for malloc and friends
 */

extern int  _end;

extern "C" {
  caddr_t _sbrk ( int incr ) {

    static unsigned char *heap = NULL;
    unsigned char *prev_heap;

    if (heap == NULL) {
      heap = (unsigned char *)&_end;
    }
    prev_heap = heap;
    /* check removed to show basic approach */

    heap += incr;

    return (caddr_t) prev_heap;
  }
}