newlib/libc/sys/h8500hms/syscalls.c

   1
   2 #include <_ansi.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6
   7 int
   8 _read (file, ptr, len)
   9      int file;
  10      char *ptr;
  11      size_t len;
  12
  13 {
  14   return 0;
  15 }
  16
  17
  18 int
  19 _lseek (file, ptr, dir)
  20      int file;
  21      int ptr;
  22      int dir;
  23
  24 {
  25   return 0;
  26
  27 }
  28
  29 static
  30 writechar (c)
  31      char c;
  32
  33
  34 {
  35   register int n asm ("r3");
  36   n = c;
  37 asm ("clr.w     r1;mov.w %0,r0; mov.w #6,r3; trapa #15": :"g" (n) : "r3","r1","r0");
  38 }
  39
  40
  41
  42 int
  43 _write (file, ptr, len)
  44      int file;
  45      char *ptr;
  46      size_t len;
  47 {
  48
  49   int todo;
  50
  51   for (todo = 0; todo < len; todo++)
  52     {
  53       writechar (*ptr++);
  54     }
  55   return len;
  56
  57 }
  58
  59
  60
  61 int
  62 _close (file)
  63      int file;
  64 {
  65
  66   return -1;
  67 }
  68
  69
  70
  71 caddr_t
  72 _sbrk (incr)
  73      size_t incr;
  74 {
  75   extern char end;              /* Defined by the linker */
  76   static char *heap_end;
  77   char *prev_heap_end;
  78
  79   if (heap_end == 0)
  80     {
  81       heap_end = &end;
  82     }
  83   prev_heap_end = heap_end;
  84   if (heap_end + incr > stack_ptr)
  85     {
  86       _write (1, "Heap and stack collision\n", 25);
  87       abort ();
  88     }
  89   heap_end += incr;
  90   return (caddr_t) prev_heap_end;
  91 }
  92
  93
  94
  95 int
  96 _isatty (file)
  97      int file;
  98 {
  99   return 1;
 100 }
 101
 102
 103
 104 int
 105 _fstat (file, stat)
 106      int file;
 107      struct stat *stat;
 108
 109 {
 110   stat->st_mode = S_IFCHR;
 111   return 0;
 112 }
 113
 114 int
 115 _open (path, flags)
 116      const char *path;
 117      int flags;
 118
 119 {
 120   return 0;
 121 }
 122
 123
 124 void
 125 _exit (status)
 126      int status;
 127 {
 128   asm (" mov.w #33,r3; trapa #15");
 129 }