[PATCH] add kexec_load() syscall

[maximilian attems <max at stro dot at>]

Not sure how to add it properly, this is my first glibc touching,
hints howto do it better are appreciated.

Motivation is to axe the syscall maze in kexec-tools itself and
have this syscall supported in glibc.

---
 misc/Makefile                        |    2 +-
 sysdeps/unix/sysv/linux/kexec_load.c |   30 ++++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/sys/kexec.h  |   20 ++++++++++++++++++++
 3 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 sysdeps/unix/sysv/linux/kexec_load.c
 create mode 100644 sysdeps/unix/sysv/linux/sys/kexec.h

diff --git a/misc/Makefile b/misc/Makefile
index d1c0a02..4ce78d2 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -41,7 +41,7 @@ routines := brk sbrk sstk ioctl \
 	    getdtsz \
 	    gethostname sethostname getdomain setdomain \
 	    select pselect \
-	    acct chroot fsync sync fdatasync syncfs reboot \
+	    acct chroot fsync sync fdatasync syncfs reboot kexec_load \
 	    gethostid sethostid \
 	    revoke vhangup \
 	    swapon swapoff mktemp mkstemp mkstemp64 mkdtemp \
diff --git a/sysdeps/unix/sysv/linux/kexec_load.c b/sysdeps/unix/sysv/linux/kexec_load.c
new file mode 100644
index 0000000..8a38c03
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/kexec_load.c
@@ -0,0 +1,30 @@
+/* Copyright (C) 1996, 1997, 1998, 1999, 2003 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <sys/kexec.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+/* Call kernel with additional two arguments the syscall requires.  */
+long
+kexec_load (void *entry, unsigned long nr_segments,
+		struct kexec_segment *segments, unsigned long flags)
+{
+  return INLINE_SYSCALL (kexec_load, entry, nr_segments, segments, flags);
+}
diff --git a/sysdeps/unix/sysv/linux/sys/kexec.h b/sysdeps/unix/sysv/linux/sys/kexec.h
new file mode 100644
index 0000000..2ccd643
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sys/kexec.h
@@ -0,0 +1,20 @@
+#ifndef _SYS_KEXEC_H
+#define _SYS_KEXEC_H   1
+
+
+struct kexec_segment {
+	const void *buf;
+	size_t bufsz;
+	const void *mem;
+	size_t memsz;
+};
+
+__BEGIN_DECLS
+
+static inline long kexec_load(void *__entry, unsigned long __nr_segments,
+		struct kexec_segment *__segments,
+		unsigned long __flags) __THROW;
+
+__END_DECLS
+
+#endif  /* _SYS_KEXEC_H */
-- 
1.7.10