Atsushi Nemoto writes:

Current MIPS readahead(), posix_fadvise(), posix_fadvise64() do not
match with kernel on all ABIs.

On O32 ABI, a padding is needed before a long long argument.
On N32/N64, a long long argument should be passed via a single register.

libc/sysdeps/linux/mips/Makefile.arch

@@ -7,7 +7,8 @@
 
 CSRC := \
 	__longjmp.c  brk.c setjmp_aux.c mmap.c __syscall_error.c \
-	cacheflush.c pread_write.c sysmips.c _test_and_set.c sigaction.c
+	cacheflush.c pread_write.c sysmips.c _test_and_set.c sigaction.c \
+	readahead.c posix_fadvise.c posix_fadvise64.c
 
 SSRC := bsd-_setjmp.S bsd-setjmp.S setjmp.S clone.S syscall.S pipe.S
 

libc/sysdeps/linux/mips/posix_fadvise.c

@@ -0,0 +1,39 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fadvise() for MIPS uClibc
+ * http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <unistd.h>
+#include <errno.h>
+#include <endian.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <fcntl.h>
+
+int posix_fadvise(int fd, off_t offset, off_t len, int advice)
+{
+/* MIPS kernel only has NR_fadvise64 which acts as NR_fadvise64_64 */
+#ifdef __NR_fadvise64
+	INTERNAL_SYSCALL_DECL(err);
+# if _MIPS_SIM == _ABIO32
+	int ret = INTERNAL_SYSCALL(fadvise64, err, 7, fd, 0,
+		__LONG_LONG_PAIR ((long) (offset >> 31), (long) offset),
+		__LONG_LONG_PAIR ((long) (len >> 31), (long) len),
+		advice);
+# else /* N32 || N64 */
+	int ret = INTERNAL_SYSCALL(fadvise64, err, 4, fd, offset, len, advice);
+# endif
+	if (INTERNAL_SYSCALL_ERROR_P (ret, err))
+		return INTERNAL_SYSCALL_ERRNO (ret, err);
+	return 0;
+#else
+	return ENOSYS;
+#endif
+}

libc/sysdeps/linux/mips/posix_fadvise64.c

@@ -0,0 +1,43 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * posix_fadvise64() for MIPS uClibc
+ * http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <unistd.h>
+#include <errno.h>
+#include <endian.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <fcntl.h>
+
+#ifdef __UCLIBC_HAS_LFS__
+
+int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
+{
+/* MIPS kernel only has NR_fadvise64 which acts as NR_fadvise64_64 */
+#ifdef __NR_fadvise64
+	INTERNAL_SYSCALL_DECL(err);
+# if _MIPS_SIM == _MIPS_SIM_ABI32
+	int ret = INTERNAL_SYSCALL(fadvise64, err, 7, fd, 0,
+		__LONG_LONG_PAIR ((long) (offset >> 32), (long) offset),
+		__LONG_LONG_PAIR ((long) (len >> 32), (long) len),
+		advice);
+# else /* N32 || N64 */
+	int ret = INTERNAL_SYSCALL(fadvise64, err, 4, fd, offset, len, advice);
+# endif
+	if (INTERNAL_SYSCALL_ERROR_P (ret, err))
+		return INTERNAL_SYSCALL_ERRNO (ret, err);
+	return 0;
+#else
+	return ENOSYS;
+#endif
+}
+
+#endif /* __UCLIBC_HAS_LFS__ */

libc/sysdeps/linux/mips/readahead.c

@@ -0,0 +1,38 @@
+/* Provide kernel hint to read ahead.
+   Copyright (C) 2002, 2003, 2004 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+#ifdef __NR_readahead
+
+ssize_t readahead(int fd, off64_t offset, size_t count)
+{
+# if _MIPS_SIM == _ABIO32
+	return INLINE_SYSCALL (readahead, 5, fd, 0,
+		__LONG_LONG_PAIR ((off_t) (offset >> 32), (off_t) offset),
+		count);
+# else /* N32 || N64 */
+	return INLINE_SYSCALL (readahead, 3, fd, offset, count);
+# endif
+}
+
+#endif