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#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <reent.h>
#include "sys/syscall.h"
 
int __trap0 (int function, int p1, int p2, int p3, struct _reent *r);
 
#define TRAP0(f, p1, p2, p3) \
__trap0 (f, (int) (p1), (int) (p2), (int) (p3), _REENT)
 
asm ("
	.text
	.global	__trap0
__trap0:
	trap	#0		; trap 0 returns result in r0, error code in r2
	cmpui	r2,#1		; is error code zero?
	bc	.Lret		; yes, skip setting errno
	.fillinsn
	ld	r4,@(sp)	; no, set errno
	st	r2,@r4
.Lret:
	jmp	lr		; return to caller
	.fillinsn
");
 
int
_open (const char *path, int flags)
{
  return TRAP0 (SYS_open, path, flags, 0);
}
 
int
_close (int file)
{
  return TRAP0 (SYS_close, file, 0, 0);
}
 
int
_read (int file, char *ptr, int len)
{
  return TRAP0 (SYS_read, file, ptr, len);
}
 
int
_lseek (int file, int ptr, int dir)
{
  return TRAP0 (SYS_lseek, file, ptr, dir);
}
 
int
_write (int file, char *ptr, int len)
{
  return TRAP0 (SYS_write, file, ptr, len);
}
 
caddr_t
_sbrk (int incr)
{
  /* `_end' is defined in the linker script.
     We must handle it carefully as we don't want the compiler to think
     it lives in the small data area.  Use medium model to ensure 32 bit
     addressability.  */
  extern char _end __attribute__ ((__model__(__medium__)));
  static char *heap_end;
  char *prev_heap_end;
  char *sp = (char *)&sp;
 
  if (heap_end == 0)
    {
      heap_end = &_end;
    }
  prev_heap_end = heap_end;
  if (heap_end > sp)
    {
      _write (1, "Heap and stack collision\n", 25);
      abort ();
    }
  heap_end += incr;
  return (caddr_t) prev_heap_end;
}
 
int
_fstat (int file, struct stat *st)
{
  st->st_mode = S_IFCHR;
  return 0;
}
 
int
_unlink ()
{
  return -1;
}
 
/* FIXME: can we not nuke the 10,000 copies of this function
   and fudge things (which is all this function does) in _fstat?  */
int
isatty (int fd)
{
  return 1;
}
 
void
_exit (n)
{
  TRAP0 (SYS_exit, n, 0, 0);
}
 
_kill (n, m)
{
  return TRAP0 (SYS_exit, 0xdead, 0, 0);
}
 
_getpid (n)
{
  return 1;
}
 
_raise ()
{
}
 
int
_stat (const char *path, struct stat *st)
 
{
  return TRAP0 (SYS_stat, path, st, 0);
}
 
int
_chmod (const char *path, short mode)
{
  return TRAP0 (SYS_chmod, path, mode, 0);
}
 
int
_utime (path, times)
     const char *path;
     char *times;
{
  return TRAP0 (SYS_utime, path, times, 0);
}