linux: Move xmknod{at} to compat symbols

It also decouple mknod{at} from xmknod{at}.  The riscv32 ABI was added
on 2.33, so it is safe to remove the old __xmknot{at} symbols and just
provide the newer mknod{at} ones.

Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.

Reviewed-by: Lukasz Majewski <lukma@denx.de>

1 files changed, 35 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/mknodat.c b/sysdeps/unix/sysv/linux/mknodat.c
new file mode 100644
index 0000000..fdb8f19
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mknodat.c
@@ -0,0 +1,35 @@
+/* Create a special or ordinary file.  Linux version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+int
+__mknodat (int fd, const char *path, mode_t mode, dev_t dev)
+{
+  /* The user-exported dev_t is 64-bit while the kernel interface is
+     32-bit.  */
+  unsigned int k_dev = dev;
+  if (k_dev != dev)
+    return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
+
+  return INLINE_SYSCALL_CALL (mknodat, fd, path, mode, k_dev);
+}
+libc_hidden_def (__mknodat)
+weak_alias (__mknodat, mknodat)