Import the CloudABI datatypes and create a system call table.

CloudABI is a pure capability-based runtime environment for UNIX. It
works similar to Capsicum, except that processes already run in
capabilities mode on startup. All functionality that conflicts with this
model has been omitted, making it a compact binary interface that can be
supported by other operating systems without too much effort.

CloudABI is 'secure by default'; the idea is that it should be safe to
run arbitrary third-party binaries without requiring any explicit
hardware virtualization (Bhyve) or namespace virtualization (Jails). The
rights of an application are purely determined by the set of file
descriptors that you grant it on startup.

The datatypes and constants used by CloudABI's C library (cloudlibc) are
defined in separate files called syscalldefs_mi.h (pointer size
independent) and syscalldefs_md.h (pointer size dependent). We import
these files in sys/contrib/cloudabi and wrap around them in
cloudabi*_syscalldefs.h.

We then add stubs for all of the system calls in sys/compat/cloudabi or
sys/compat/cloudabi64, depending on whether the system call depends on
the pointer size. We only have nine system calls that depend on the
pointer size. If we ever want to support 32-bit binaries, we can simply
add sys/compat/cloudabi32 and implement these nine system calls again.

The next step is to send in code reviews for the individual system call
implementations, but also add a sysentvec, to allow CloudABI executabled
to be started through execve().

More information about CloudABI:
- GitHub: https://github.com/NuxiNL/cloudlibc
- Talk at BSDCan: https://www.youtube.com/watch?v=SVdF84x1EdA

Differential Revision:	https://reviews.freebsd.org/D2848
Reviewed by:	emaste, brooks
Obtained from:	https://github.com/NuxiNL/freebsd

1 files changed, 66 insertions, 0 deletions

diff --git a/sys/compat/cloudabi64/cloudabi64_fd.c b/sys/compat/cloudabi64/cloudabi64_fd.c
new file mode 100644
index 000000000000..bbe236ae835c
--- /dev/null
+++ b/sys/compat/cloudabi64/cloudabi64_fd.c
@@ -0,0 +1,66 @@
+/*-
+ * Copyright (c) 2015 Nuxi, https://nuxi.nl/
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <compat/cloudabi64/cloudabi64_syscalldefs.h>
+#include <compat/cloudabi64/cloudabi64_proto.h>
+
+int
+cloudabi64_sys_fd_pread(struct thread *td,
+    struct cloudabi64_sys_fd_pread_args *uap)
+{
+
+	/* Not implemented. */
+	return (ENOSYS);
+}
+
+int
+cloudabi64_sys_fd_pwrite(struct thread *td,
+    struct cloudabi64_sys_fd_pwrite_args *uap)
+{
+
+	/* Not implemented. */
+	return (ENOSYS);
+}
+
+int
+cloudabi64_sys_fd_read(struct thread *td,
+    struct cloudabi64_sys_fd_read_args *uap)
+{
+
+	/* Not implemented. */
+	return (ENOSYS);
+}
+
+int
+cloudabi64_sys_fd_write(struct thread *td,
+    struct cloudabi64_sys_fd_write_args *uap)
+{
+
+	/* Not implemented. */
+	return (ENOSYS);
+}