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/*

 * C library support files for the Blackfin processor

 *

 * Copyright (C) 2006 Analog Devices, Inc.

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include <_ansi.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/fcntl.h>

#include <stdio.h>

#include <time.h>

#include <sys/time.h>

#include <sys/times.h>

#include "syscall.h"

#include <errno.h>

#include <reent.h>

#include <unistd.h>

register char *stack_ptr asm ("SP");

static inline int

do_syscall (int reason, void *arg)

{

  register int r asm ("P0") = reason;

  register void *a asm ("R0") = arg;

  register int result asm ("R0");

  asm volatile ("excpt 0;" : "=r" (result) : "a" (r), "r" (a) : "memory", "CC");

  return result;

}

int

_read (int file, char *ptr, int len)

{

  int block[3];

  block[0] = file;

  block[1] = (int) ptr;

  block[2] = len;

  return do_syscall (SYS_read, block);

}

int

_lseek (int file, int ptr, int dir)

{

  int block[2];

  block[0] = file;

  block[1] = ptr;

  return do_syscall (SYS_lseek, block);

}

int

_write (int file, char *ptr, int len)

{

  int block[3];

  block[0] = file;

  block[1] = (int) ptr;

  block[2] = len;

  return do_syscall (SYS_write, block);

}

int

_open (const char *path, int flags)

{

  int block[2];

  block[0] = (int) path;

  block[1] = flags;

  return do_syscall (SYS_open, block);

}

int

_close (int file)

{

  return do_syscall (SYS_close, &file);

}

void

_exit (int n)

{

  do_syscall (SYS_exit, &n);

}

int

_kill (int n, int m)

{

  int block[2];

  block[0] = n;

  block[1] = m;

  return do_syscall (SYS_kill, block);

}

int

_getpid (int n)

{

  return 1;

}

caddr_t

_sbrk (int incr)

{

  extern char 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)

    {

      /* Some of the libstdc++-v3 tests rely upon detecting

         out of memory errors, so do not abort here.  */

#if 0

      extern void abort (void);

      _write (1, "_sbrk: Heap and stack collision\n", 32);

      abort ();

#else

      errno = ENOMEM;

      return (caddr_t) -1;

#endif

    }

  heap_end += incr;

  return (caddr_t) prev_heap_end;

}

extern void memset (struct stat *, int, unsigned int);

int

_fstat (int file, struct stat * st)

{

  memset (st, 0, sizeof (* st));

  st->st_mode = S_IFCHR;

  st->st_blksize = 1024;

  return 0;

}

int _stat (const char *fname, struct stat *st)

{

  int file;

  /* The best we can do is try to open the file readonly.  If it exists,

     then we can guess a few things about it.  */

  if ((file = _open (fname, O_RDONLY)) < 0)

    return -1;

  memset (st, 0, sizeof (* st));

  st->st_mode = S_IFREG | S_IREAD;

  st->st_blksize = 1024;

  _close (file); /* Not interested in the error.  */

  return 0;

}

int

_link (void)

{

  return -1;

}

int

_unlink (void)

{

  return -1;

}

void

_raise (void)

{

  return;

}

int

_gettimeofday (struct timeval *tv, void *tz)

{

  tv->tv_usec = 0;

  tv->tv_sec = do_syscall (SYS_time, 0);

  return 0;

}

/* Return a clock that ticks at 100Hz.  */

clock_t

_times (struct tms * tp)

{

  return -1;

}

int

_isatty (int fd)

{

  return 1;

}

int

_system (const char *s)

{

  if (s == NULL)

    return 0;

  errno = ENOSYS;

  return -1;

}

int

_rename (const char * oldpath, const char * newpath)

{

  errno = ENOSYS;

  return -1;

}

static inline int

__setup_argv_for_main (int argc)

{

  int block[2];

  char **argv;

  int i = argc;

  argv = __builtin_alloca ((1 + argc) * sizeof (*argv));

  argv[i] = NULL;

  while (i--) {

    block[0] = i;

    argv[i] = __builtin_alloca (1 + do_syscall (SYS_argnlen, (void *)block));

    block[1] = (int) argv[i];

    do_syscall (SYS_argn, (void *)block);

  }

  return main (argc, argv);

}

int

__setup_argv_and_call_main ()

{

  int argc = do_syscall (SYS_argc, 0);

  if (argc <= 0)

    return main (argc, NULL);

  else

    return __setup_argv_for_main (argc);

}