syscalls.c

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/****************************************************************************
*  Copyright (c) 2009 by Michael Fischer. All rights reserved.
*
*  Redistribution and use in source and binary forms, with or without 
*  modification, are permitted provided that the following conditions 
*  are met:
*  
*  1. Redistributions of source code must retain the above copyright 
*     notice, this list of conditions and the following disclaimer.
*  2. Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the 
*     documentation and/or other materials provided with the distribution.
*  3. Neither the name of the author nor the names of its contributors may 
*     be used to endorse or promote products derived from this software 
*     without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
*  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
*  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
*  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
*  THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
*  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
*  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 
*  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
*  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
*  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
*  SUCH DAMAGE.
*
****************************************************************************
*  History:
*
*  28.03.09  mifi   First Version, based on the original syscall.c from
*                   newlib version 1.17.0
****************************************************************************/

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "uart/uart.h"

int _read_r (struct _reent *r, int file, char * ptr, int len)
{
  r = r;
  file = file;
  ptr = ptr;
  len = len;
  
  errno = EINVAL;
  return -1;
}

/***************************************************************************/

int _lseek_r (struct _reent *r, int file, int ptr, int dir)
{
  r = r;
  file = file;
  ptr = ptr;
  dir = dir;
  
  return 0;
}

/***************************************************************************/

int _write_r (struct _reent *r, int file, char * ptr, int len)
{  
  r = r;
  file = file;
  ptr = ptr;

#if 1
  int index;

  /* For example, output string by UART */
  for(index=0; index<len; index++)
  {
    if (ptr[index] == '\n')
    {
      UARTTransmitByte('\r',UART_CH_0);
    }

    UARTTransmitByte(ptr[index],UART_CH_0);
  }
#endif

  
  return len;
}

/***************************************************************************/

int _close_r (struct _reent *r, int file)
{
  return 0;
}

/***************************************************************************/

/* Register name faking - works in collusion with the linker.  */
register char * stack_ptr asm ("sp");

caddr_t _sbrk_r (struct _reent *r, int incr)
{
  extern char   end asm ("end"); /* Defined by the linker.  */
  static char * heap_end;
  unsigned long n;
  char *        prev_heap_end;
  if (heap_end == NULL)
    heap_end = &end;
  
  prev_heap_end = heap_end;
  
  if (heap_end + incr > stack_ptr)
  {
          uart_puts("\n Heap > stack");
      /* Some of the libstdc++-v3 tests rely upon detecting
        out of memory errors, so do not abort here.  */
#if 0
      extern void DABT_Routine(void);

      n = (unsigned long)stack_ptr;

      uart_puts("0x");
      uart_putc('0' + ((n>>7) & 0xf));
      uart_putc('0' + ((n>>6) & 0xf));
      uart_putc('0' + ((n>>5) & 0xf));
      uart_putc('0' + ((n>>4) & 0xf));
      uart_putc('0' + ((n>>3) & 0xf));
      uart_putc('0' + ((n>>2) & 0xf));
      uart_putc('0' + ((n>>1) & 0xf));
      uart_putc('0' + ((n) & 0xf));
      uart_putc(' ');

      n = (unsigned long)(heap_end);

      uart_puts("0x");
      uart_putc('0' + ((n>>7) & 0xf));
      uart_putc('0' + ((n>>6) & 0xf));
      uart_putc('0' + ((n>>5) & 0xf));
      uart_putc('0' + ((n>>4) & 0xf));
      uart_putc('0' + ((n>>3) & 0xf));
      uart_putc('0' + ((n>>2) & 0xf));
      uart_putc('0' + ((n>>1) & 0xf));
      uart_putc('0' + ((n) & 0xf));
      uart_putc(' ');

      uart_puts("_sbrk: Heap and stack collision\n");
      
      DABT_Routine ();
#else
      errno = ENOMEM;
      return (caddr_t) -1;
#endif
  }
  
  heap_end += incr;

  return (caddr_t) prev_heap_end;
}

/***************************************************************************/

int _fstat_r (struct _reent *r, int file, struct stat * st)
{
  r = r; 
  file = file;
   
  memset (st, 0, sizeof (* st));
  st->st_mode = S_IFCHR;
  return 0;
}

/***************************************************************************/

int _isatty_r(struct _reent *r, int fd)
{
  r = r;
  fd = fd;
   
  return 1;
}

/*** EOF ***/