Add a sysentvec for CloudABI on x86-64.

Summary:
For CloudABI we need to put two things on the stack of new processes:
the argument data (a binary blob; not strings) and a startup data
structure. The startup data structure contains interesting things such
as a pointer to the ELF program header, the thread ID of the initial
thread, a stack smashing protection canary, and a pointer to the
argument data.

Fetching system call arguments and setting the return value is similar
to FreeBSD. The only differences are that system call 0 does not exist
and that we call into cloudabi_convert_errno() to convert the error
code. We also need this function in a couple of other places, so we'd
better reuse it here.

Reviewers: dchagin, kib

Reviewed By: kib

Subscribers: imp

Differential Revision: https://reviews.freebsd.org/D3098

2 files changed, 157 insertions, 0 deletions

diff --git a/sys/compat/cloudabi/cloudabi_errno.c b/sys/compat/cloudabi/cloudabi_errno.c
new file mode 100644
index 0000000..5193cfc
--- /dev/null
+++ b/sys/compat/cloudabi/cloudabi_errno.c
@@ -0,0 +1,121 @@
+/*-
+ * 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 <sys/param.h>
+
+#include <compat/cloudabi/cloudabi_syscalldefs.h>
+#include <compat/cloudabi/cloudabi_util.h>
+
+/* Converts a FreeBSD errno to a CloudABI errno. */
+cloudabi_errno_t
+cloudabi_convert_errno(int error)
+{
+	static const int table[] = {
+		[E2BIG]			= CLOUDABI_E2BIG,
+		[EACCES]		= CLOUDABI_EACCES,
+		[EADDRINUSE]		= CLOUDABI_EADDRINUSE,
+		[EADDRNOTAVAIL]		= CLOUDABI_EADDRNOTAVAIL,
+		[EAFNOSUPPORT]		= CLOUDABI_EAFNOSUPPORT,
+		[EAGAIN]		= CLOUDABI_EAGAIN,
+		[EALREADY]		= CLOUDABI_EALREADY,
+		[EBADF]			= CLOUDABI_EBADF,
+		[EBADMSG]		= CLOUDABI_EBADMSG,
+		[EBUSY]			= CLOUDABI_EBUSY,
+		[ECANCELED]		= CLOUDABI_ECANCELED,
+		[ECHILD]		= CLOUDABI_ECHILD,
+		[ECONNABORTED]		= CLOUDABI_ECONNABORTED,
+		[ECONNREFUSED]		= CLOUDABI_ECONNREFUSED,
+		[ECONNRESET]		= CLOUDABI_ECONNRESET,
+		[EDEADLK]		= CLOUDABI_EDEADLK,
+		[EDESTADDRREQ]		= CLOUDABI_EDESTADDRREQ,
+		[EDOM]			= CLOUDABI_EDOM,
+		[EDQUOT]		= CLOUDABI_EDQUOT,
+		[EEXIST]		= CLOUDABI_EEXIST,
+		[EFAULT]		= CLOUDABI_EFAULT,
+		[EFBIG]			= CLOUDABI_EFBIG,
+		[EHOSTUNREACH]		= CLOUDABI_EHOSTUNREACH,
+		[EIDRM]			= CLOUDABI_EIDRM,
+		[EILSEQ]		= CLOUDABI_EILSEQ,
+		[EINPROGRESS]		= CLOUDABI_EINPROGRESS,
+		[EINTR]			= CLOUDABI_EINTR,
+		[EINVAL]		= CLOUDABI_EINVAL,
+		[EIO]			= CLOUDABI_EIO,
+		[EISCONN]		= CLOUDABI_EISCONN,
+		[EISDIR]		= CLOUDABI_EISDIR,
+		[ELOOP]			= CLOUDABI_ELOOP,
+		[EMFILE]		= CLOUDABI_EMFILE,
+		[EMLINK]		= CLOUDABI_EMLINK,
+		[EMSGSIZE]		= CLOUDABI_EMSGSIZE,
+		[EMULTIHOP]		= CLOUDABI_EMULTIHOP,
+		[ENAMETOOLONG]		= CLOUDABI_ENAMETOOLONG,
+		[ENETDOWN]		= CLOUDABI_ENETDOWN,
+		[ENETRESET]		= CLOUDABI_ENETRESET,
+		[ENETUNREACH]		= CLOUDABI_ENETUNREACH,
+		[ENFILE]		= CLOUDABI_ENFILE,
+		[ENOBUFS]		= CLOUDABI_ENOBUFS,
+		[ENODEV]		= CLOUDABI_ENODEV,
+		[ENOENT]		= CLOUDABI_ENOENT,
+		[ENOEXEC]		= CLOUDABI_ENOEXEC,
+		[ENOLCK]		= CLOUDABI_ENOLCK,
+		[ENOLINK]		= CLOUDABI_ENOLINK,
+		[ENOMEM]		= CLOUDABI_ENOMEM,
+		[ENOMSG]		= CLOUDABI_ENOMSG,
+		[ENOPROTOOPT]		= CLOUDABI_ENOPROTOOPT,
+		[ENOSPC]		= CLOUDABI_ENOSPC,
+		[ENOSYS]		= CLOUDABI_ENOSYS,
+		[ENOTCONN]		= CLOUDABI_ENOTCONN,
+		[ENOTDIR]		= CLOUDABI_ENOTDIR,
+		[ENOTEMPTY]		= CLOUDABI_ENOTEMPTY,
+		[ENOTRECOVERABLE]	= CLOUDABI_ENOTRECOVERABLE,
+		[ENOTSOCK]		= CLOUDABI_ENOTSOCK,
+		[ENOTSUP]		= CLOUDABI_ENOTSUP,
+		[ENOTTY]		= CLOUDABI_ENOTTY,
+		[ENXIO]			= CLOUDABI_ENXIO,
+		[EOVERFLOW]		= CLOUDABI_EOVERFLOW,
+		[EOWNERDEAD]		= CLOUDABI_EOWNERDEAD,
+		[EPERM]			= CLOUDABI_EPERM,
+		[EPIPE]			= CLOUDABI_EPIPE,
+		[EPROTO]		= CLOUDABI_EPROTO,
+		[EPROTONOSUPPORT]	= CLOUDABI_EPROTONOSUPPORT,
+		[EPROTOTYPE]		= CLOUDABI_EPROTOTYPE,
+		[ERANGE]		= CLOUDABI_ERANGE,
+		[EROFS]			= CLOUDABI_EROFS,
+		[ESPIPE]		= CLOUDABI_ESPIPE,
+		[ESRCH]			= CLOUDABI_ESRCH,
+		[ESTALE]		= CLOUDABI_ESTALE,
+		[ETIMEDOUT]		= CLOUDABI_ETIMEDOUT,
+		[ETXTBSY]		= CLOUDABI_ETXTBSY,
+		[EXDEV]			= CLOUDABI_EXDEV,
+		[ENOTCAPABLE]		= CLOUDABI_ENOTCAPABLE,
+	};
+
+	/* Unknown error: fall back to returning ENOSYS. */
+	if (error < 0 || error >= nitems(table) || table[error] == 0)
+		return (error == 0 ? 0 : CLOUDABI_ENOSYS);
+	return (table[error]);
+}
diff --git a/sys/compat/cloudabi/cloudabi_util.h b/sys/compat/cloudabi/cloudabi_util.h
new file mode 100644
index 0000000..4389e3d
--- /dev/null
+++ b/sys/compat/cloudabi/cloudabi_util.h
@@ -0,0 +1,36 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _CLOUDABI_UTIL_H_
+#define	_CLOUDABI_UTIL_H_
+
+#include <compat/cloudabi/cloudabi_syscalldefs.h>
+
+/* Converts a FreeBSD errno to a CloudABI errno. */
+cloudabi_errno_t cloudabi_convert_errno(int);
+
+#endif