1 files changed, 41 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S b/ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S
new file mode 100644
index 0000000000..e966c4d891
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S
@@ -0,0 +1,41 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+
+/* TILE-Gx specifies that "unsigned int" is sign extended in the high
+   32 bits.  But since the userspace API claims to be "unsigned long",
+   calls into __ioctl() will not be sign extended, but rather pass all
+   64 bits of the argument.  Therefore, when we pass the "request"
+   value to the kernel, we must explicitly sign-extend it to match the
+   kernel's internal use of "unsigned int" as the second argument,
+   which we do by casting to "unsigned int".  */
+
+#include <sysdep.h>
+
+	.text
+ENTRY (__ioctl)
+	FEEDBACK_ENTER(__ioctl)
+	{
+	 addxi r1, r1, 0
+	 moveli TREG_SYSCALL_NR_NAME, __NR_ioctl
+	}
+	swint1
+	BNEZ r1, 0f
+	jrp lr
+PSEUDO_END (__ioctl)
+weak_alias (__ioctl, ioctl)