syscalls.c

来自「用keil仿真arm芯片的程序」· C语言 代码 · 共 29 行

/* System Calls Remapping */

#include <sys/stat.h>
#include <stdlib.h>

void _exit (int n) {
label:  goto label; /* endless loop */
}

register char * stack_ptr asm ("sp");

caddr_t _sbrk (int incr) {
  extern char   end asm ("end");	/* Defined by the linker */
  static char * heap_end;
         char * prev_heap_end;

  if (heap_end == NULL) heap_end = &end;
  prev_heap_end = heap_end;
  
  if (heap_end + incr > stack_ptr) {
//  _write (1, "_sbrk: Heap and stack collision\n", 32);
    abort ();
  }  
  heap_end += incr;

  return (caddr_t) prev_heap_end;
}