arc: libgloss: Add UART 8250 library

[newlib-cygwin.git] / libgloss / arc / uart-8250-stub.c

diff --git a/libgloss/arc/uart-8250-stub.c b/libgloss/arc/uart-8250-stub.c
new file mode 100644 (file)
index 0000000..ab69d63
--- /dev/null
+++ b/libgloss/arc/uart-8250-stub.c
@@ -0,0 +1,116 @@
+/*
+ * 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;
+}