neorv32_newlib.c File Reference

NEORV32-specific Newlib system calls. More...

#include <neorv32.h>
#include <newlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>

Macros
#define	SYSCALL_ATTR   __attribute__((used, externally_visible, noinline))

Functions
SYSCALL_ATTR void	_exit (int status)
SYSCALL_ATTR int	_open (char *pathname, int flags)
SYSCALL_ATTR int	_close (int file)
SYSCALL_ATTR int	_fstat (int file, struct stat *st)
SYSCALL_ATTR int	_fork (void)
SYSCALL_ATTR int	_getpid ()
SYSCALL_ATTR int	_isatty (int file)
SYSCALL_ATTR int	_kill (int pid, int sig)
SYSCALL_ATTR int	_link (char *old_name, char *new_name)
SYSCALL_ATTR int	_lseek (int file, int ptr, int dir)
SYSCALL_ATTR int	_stat (char *file, struct stat *st)
SYSCALL_ATTR int	_wait (int status)
SYSCALL_ATTR int	_unlink (char *name)
SYSCALL_ATTR int	_read (int file, char *ptr, int len)
SYSCALL_ATTR int	_write (int file, char *ptr, int len)
SYSCALL_ATTR void *	_sbrk (int incr)
SYSCALL_ATTR int	_gettimeofday (struct timeval *tv)

Variables
int	errno
char *	__env [1] = { 0 }
char **	environ = __env

Detailed Description

NEORV32-specific Newlib system calls.

Note

Sources: https://www.sourceware.org/newlib/libc.html#Syscalls https://interrupt.memfault.com/blog/boostrapping-libc-with-newlib https://www.embecosm.com/appnotes/ean9/ean9-howto-newlib-1.0.pdf

Function Documentation

_close()

SYSCALL_ATTR int _close

(

int

file

)

Close file handle.

_exit()

SYSCALL_ATTR void _exit

(

int

status

)

Issue a warning when semihosting is enabled. Exit a program without cleaning up anything.

_fork()

SYSCALL_ATTR int _fork

(

void

)

Create new process.

_fstat()

SYSCALL_ATTR int _fstat	(	int	file,
		struct stat *	st
	)

Status of an open file. All files are regarded as character special devices.

_getpid()

SYSCALL_ATTR int _getpid

(

)

Process-ID; this is sometimes used to generate strings unlikely to conflict with other processes.

_gettimeofday()

SYSCALL_ATTR int _gettimeofday

(

struct timeval *

tv

)

Get Unix time. Used by "time", among others.

_isatty()

SYSCALL_ATTR int _isatty

(

int

file

)

Query whether output stream is a terminal.

_kill()

SYSCALL_ATTR int _kill	(	int	pid,
		int	sig
	)

Send a signal.

_link()

SYSCALL_ATTR int _link	(	char *	old_name,
		char *	new_name
	)

Rename existing file.

_lseek()

SYSCALL_ATTR int _lseek	(	int	file,
		int	ptr,
		int	dir
	)

Set position in a file.

_open()

SYSCALL_ATTR int _open	(	char *	pathname,
		int	flags
	)

Open file handle.

_read()

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

Read from a file. STDIN will read from UART0, all other input streams will read from UART1.

_sbrk()

SYSCALL_ATTR void * _sbrk

(

int

incr

)

Dynamic memory management. Used by "malloc" and "free", among others.

_stat()

SYSCALL_ATTR int _stat	(	char *	file,
		struct stat *	st
	)

Status of a file.

_unlink()

SYSCALL_ATTR int _unlink

(

char *

name

)

Remove a file's directory entry.

_wait()

SYSCALL_ATTR int _wait

(

int

status

)

Wait for child process.

_write()

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

Write to a file. STDOUT and STDERR will write to UART0, all other output streams will write to UART1.