Chris Zankel writes:

The following patches add support for the Xtensa processor architecture
to uClibc. They are based on a recent SVN checkout (12/05/2007).

The first patch (attached to this post) adds Xtensa support to various
shared configuration and make files. The following patches then include
the Xtensa specific files and directories.

I welcome any feedback and would appreciate it if you could include the
patches into the mainline tree. I am certainly committed to maintain the port. 

Bob Wilson was kind enough to review the patches.

Some notes about the architecture: Xtensa is a configurable and
extensible processor architecture developed by Tensilica. For more
information, please visit: www.linux-xtensa.org.

1 files changed, 53 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/xtensa/bits/xtensa-config.h b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
new file mode 100644
index 000000000..34cf28c0a
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
@@ -0,0 +1,53 @@
+/* Xtensa configuration settings.
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+   Free Software Foundation, Inc.
+   Contributed by Bob Wilson (bwilson@tensilica.com) at Tensilica.
+
+   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, write to the Free
+   Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#ifndef XTENSA_CONFIG_H
+#define XTENSA_CONFIG_H
+
+/* The macros defined here match those with the same names in the Xtensa
+   compile-time HAL (Hardware Abstraction Layer).  Please refer to the
+   Xtensa System Software Reference Manual for documentation of these
+   macros.  */
+
+/* The following macros reflect the default expectations for Xtensa
+   processor configurations that can run glibc.  If you want to try
+   building glibc for an Xtensa configuration that is missing these
+   options, you will at least need to change the values of these
+   macros.  */
+
+#undef XCHAL_HAVE_NSA
+#define XCHAL_HAVE_NSA			1
+
+#undef XCHAL_HAVE_LOOPS
+#define XCHAL_HAVE_LOOPS		1
+
+/* Assume the maximum number of AR registers.  This currently only affects
+   the __window_spill function, and it is always safe to flush extra.  */
+
+#undef XCHAL_NUM_AREGS
+#define XCHAL_NUM_AREGS			64
+
+/* Set a default page size.  This is currently needed when bootstrapping
+   the runtime linker.  See comments in dl-machine.h where this is used.  */
+
+#undef XCHAL_MMU_MIN_PTE_PAGE_SIZE
+#define XCHAL_MMU_MIN_PTE_PAGE_SIZE	12
+
+#endif /* !XTENSA_CONFIG_H */