SAMV71 Xplained Ultra Software Package 1.4

syscalls.c

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00001 /* ----------------------------------------------------------------------------
00002  *         SAM Software Package License 
00003  * ----------------------------------------------------------------------------
00004  * Copyright (c) 2011, Atmel Corporation
00005  *
00006  * All rights reserved.
00007  *
00008  * Redistribution and use in source and binary forms, with or without
00009  * modification, are permitted provided that the following conditions are met:
00010  *
00011  * - Redistributions of source code must retain the above copyright notice,
00012  * this list of conditions and the disclaimer below.
00013  *
00014  * Atmel's name may not be used to endorse or promote products derived from
00015  * this software without specific prior written permission.
00016  *
00017  * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00019  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
00020  * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00022  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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00026  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  * ----------------------------------------------------------------------------
00028  */
00029 
00030 /**
00031  * \file syscalls.c
00032  *
00033  * Implementation of newlib syscall.
00034  *
00035  */
00036 
00037 /*----------------------------------------------------------------------------
00038  *        Headers
00039  *----------------------------------------------------------------------------*/
00040 
00041 
00042 #include "board.h"
00043 
00044 #include <stdio.h>
00045 #include <stdarg.h>
00046 #include <errno.h>
00047 #include <sys/types.h>
00048 #include <sys/stat.h>
00049 
00050 /*----------------------------------------------------------------------------
00051  *        Exported variables
00052  *----------------------------------------------------------------------------*/
00053 
00054 #undef errno
00055 extern int errno;
00056 extern int  _sheap;
00057 
00058 /*----------------------------------------------------------------------------
00059  *        Exported functions
00060  *----------------------------------------------------------------------------*/
00061 extern void _exit( int status );
00062 extern void _kill( int pid, int sig );
00063 extern int _getpid ( void );
00064 
00065 extern caddr_t _sbrk ( int incr )
00066 {
00067     static unsigned char *heap = NULL;
00068     unsigned char *prev_sheap;
00069 
00070     if ( heap == NULL ) {
00071         heap = (unsigned char *)&_sheap;
00072     }
00073     prev_sheap = heap;
00074 
00075     heap += incr;
00076 
00077     return (caddr_t) prev_sheap;
00078 }
00079 
00080 extern int link( char *old, char *new )
00081 {
00082     return -1;
00083 }
00084 
00085 extern int _close( int file )
00086 {
00087     return -1;
00088 }
00089 
00090 extern int _fstat( int file, struct stat *st )
00091 {
00092     st->st_mode = S_IFCHR;
00093 
00094     return 0;
00095 }
00096 
00097 extern int _isatty( int file )
00098 {
00099     return 1;
00100 }
00101 
00102 extern int _lseek( int file, int ptr, int dir )
00103 {
00104     return 0;
00105 }
00106 
00107 extern int _read(int file, char *ptr, int len)
00108 {
00109     return 0;
00110 }
00111 
00112 extern int _write( int file, char *ptr, int len )
00113 {
00114     int iIndex;
00115 
00116     //    for (; *ptr != 0; ptr++ )
00117     for ( iIndex=0; iIndex < len; iIndex++, ptr++ ) {
00118         DBG_PutChar( *ptr );
00119     }
00120 
00121     return iIndex;
00122 }
00123 
00124 extern void _exit( int status )
00125 {
00126     printf( "Exiting with status %d.\n", status );
00127     for (;;);
00128 }
00129 
00130 extern void _kill( int pid, int sig )
00131 {
00132     return;
00133 }
00134 
00135 extern int _getpid ( void )
00136 {
00137     return -1;
00138 }
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