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Document the existence of the cloudabi32 kernel module.

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Ed Schouten 2016-08-24 12:53:54 +00:00
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commit 7c5f97dfcd
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40
share/man/man4/cloudabi.4
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@ -1,4 +1,4 @@
.\" Copyright (c) 2015 Nuxi, https://nuxi.nl/
.\" Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
@ -22,17 +22,25 @@
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.Dd October 22, 2015
.Dd August 24, 2016
.Dt CLOUDABI 4
.Os
.Sh NAME
.Nm cloudabi ,
.Nm cloudabi32 ,
.Nm cloudabi64
.Nd CloudABI support
.Sh SYNOPSIS
Support for 64-bit CloudABI executables can be compiled into the kernel
Support for 32-bit CloudABI executables can be compiled into the kernel
by adding this line to the kernel configuration file:
.Bd -ragged -offset indent
.Cd "options COMPAT_CLOUDABI32"
.Ed
.Pp
Similarly,
support for 64-bit CloudABI executables can be enabled by adding this
line:
.Bd -ragged -offset indent
.Cd "options COMPAT_CLOUDABI64"
.Ed
.Pp
@ -40,6 +48,7 @@ CloudABI support can also be loaded at boot time from
.Xr loader.conf 5 :
.Bd -literal -offset indent
cloudabi_load="YES"
cloudabi32_load="YES"
cloudabi64_load="YES"
.Ed
.Sh DESCRIPTION
@ -52,19 +61,21 @@ and hardened against security exploits.
.Pp
Support for CloudABI on
.Fx
consists of two separate kernel modules.
consists of three separate kernel modules.
The
.Nm cloudabi
kernel module implements all of the system calls that do not depend on
data structures that differ between architectures.
data structures that differ between hardware architectures.
.Pp
The
.Nm cloudabi32
and
.Nm cloudabi64
kernel module provides implementations of all of the machine-dependent
system calls.
It assumes that pointers stored in data structures provided as system
call arguments are 64 bits in size.
It also provides the image activator that loads and starts 64-bit ELF
kernel modules provide implementations of all of the machine-dependent
system calls,
assuming that pointers stored in data structures are either 32 bits or
64 bits in size.
These modules also provide the image activators that load and start ELF
executables.
.Pp
Though the
@ -72,8 +83,12 @@ Though the
module can be loaded on any architecture supported by
.Fx ,
the
.Nm cloudabi32
module is only available on i386 and amd64.
The same holds for the
.Nm cloudabi64
module is only available for amd64 and arm64.
module,
which is only available for amd64 and arm64.
.Pp
A full cross compilation toolchain for CloudABI is available in the
.Pa devel/cloudabi-toolchain
@ -93,6 +108,9 @@ restricted set of resources.
.Xr linux 4 ,
.Xr elf 5
.Pp
CloudABI for FreeBSD:
.Pa https://nuxi.nl/cloudabi/freebsd/ .
.Pp
cloudlibc on GitHub:
.Pa https://github.com/NuxiNL/cloudlibc .
.Pp