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/*
* uart-8250-stub.c -- various stubs for 8250 UART libgloss.
*
* Copyright (c) 2024 Synopsys 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 <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "glue.h"
/* Always return character device with 1024 bytes block. */
int
_fstat (int fd __attribute__ ((unused)), struct stat *buf)
{
memset (buf, 0, sizeof (*buf));
buf->st_mode = S_IFCHR;
buf->st_blksize = 1024;
return 0;
}
/* ARC UART is actually console so just return 1. */
int
_isatty (int fildes __attribute__ ((unused)))
{
return 1;
}
/* Should be provided by crt0.S. */
extern void __attribute__((noreturn)) _exit_halt (int ret);
void
__attribute__((noreturn))
_exit (int ret)
{
_exit_halt (ret);
}
/* Not implemented. */
off_t
_lseek (int fd __attribute__ ((unused)),
off_t offset __attribute__ ((unused)),
int whence __attribute__ ((unused)))
{
errno = ENOSYS;
return -1;
}
/* Not implemented. */
int
_close (int fd __attribute__ ((unused)))
{
errno = ENOSYS;
return -1;
}
/* Not implemented. */
int
_open (const char *path __attribute__ ((unused)),
int flags __attribute__ ((unused)), ...)
{
errno = ENOSYS;
return -1;
}
/* If PID is equal to __MYPID, exit with sig as retcode. */
int
_kill (int pid, int sig)
{
if (pid == __MYPID)
_exit (sig);
errno = ENOSYS;
return -1;
}
/* Return __MYPID. */
int
_getpid (void)
{
return __MYPID;
}
/* No arguments. */
int
_argc (void)
{
return 0;
}
/* No arguments. */
uint32_t
_argvlen (int a __attribute__ ((unused)))
{
return 0;
}
/* No arguments. */
int
_argv (int a __attribute__ ((unused)), char *arg __attribute__ ((unused)))
{
return -1;
}
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