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.

1 files changed, 39 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/mips/posix_fadvise.c b/libc/sysdeps/linux/mips/posix_fadvise.c
new file mode 100644
index 000000000..8546d96ba
--- /dev/null
+++ b/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
+}