117 lines
2.2 KiB
C
117 lines
2.2 KiB
C
/*
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* uart-8250-stub.c -- various stubs for 8250 UART libgloss.
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*
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* Copyright (c) 2024 Synopsys Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <sys/stat.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "glue.h"
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/* Always return character device with 1024 bytes block. */
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int
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_fstat (int fd __attribute__ ((unused)), struct stat *buf)
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{
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memset (buf, 0, sizeof (*buf));
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buf->st_mode = S_IFCHR;
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buf->st_blksize = 1024;
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return 0;
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}
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/* ARC UART is actually console so just return 1. */
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int
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_isatty (int fildes __attribute__ ((unused)))
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{
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return 1;
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}
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/* Should be provided by crt0.S. */
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extern void __attribute__((noreturn)) _exit_halt (int ret);
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void
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__attribute__((noreturn))
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_exit (int ret)
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{
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_exit_halt (ret);
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}
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/* Not implemented. */
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off_t
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_lseek (int fd __attribute__ ((unused)),
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off_t offset __attribute__ ((unused)),
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int whence __attribute__ ((unused)))
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{
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errno = ENOSYS;
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return -1;
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}
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/* Not implemented. */
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int
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_close (int fd __attribute__ ((unused)))
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{
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errno = ENOSYS;
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return -1;
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}
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/* Not implemented. */
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int
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_open (const char *path __attribute__ ((unused)),
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int flags __attribute__ ((unused)), ...)
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{
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errno = ENOSYS;
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return -1;
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}
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/* If PID is equal to __MYPID, exit with sig as retcode. */
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int
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_kill (int pid, int sig)
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{
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if (pid == __MYPID)
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_exit (sig);
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errno = ENOSYS;
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return -1;
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}
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/* Return __MYPID. */
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int
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_getpid (void)
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{
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return __MYPID;
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}
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/* No arguments. */
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int
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_argc (void)
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{
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return 0;
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}
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/* No arguments. */
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uint32_t
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_argvlen (int a __attribute__ ((unused)))
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{
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return 0;
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}
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/* No arguments. */
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int
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_argv (int a __attribute__ ((unused)), char *arg __attribute__ ((unused)))
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{
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return -1;
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}
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