+++ /dev/null
-.\" Copyright (C) 2003 Andi Kleen
-.\"
-.\" %%%LICENSE_START(VERBATIM)
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-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date. The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein. The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.TH ARCH_PRCTL 2 2007-12-26 "Linux" "Linux Programmer's Manual"
-.SH NAME
-arch_prctl \- set architecture-specific thread state
-.SH SYNOPSIS
-.nf
-.B #include <asm/prctl.h>
-.br
-.B #include <sys/prctl.h>
-.sp
-.BI "int arch_prctl(int " code ", unsigned long " addr );
-.BI "int arch_prctl(int " code ", unsigned long *" addr );
-.fi
-.SH DESCRIPTION
-The
-.BR arch_prctl ()
-function sets architecture-specific process or thread state.
-.I code
-selects a subfunction
-and passes argument
-.I addr
-to it;
-.I addr
-is interpreted as either an
-.I "unsigned long"
-for the "set" operations, or as an
-.IR "unsigned long\ *" ,
-for the "get" operations.
-.LP
-Subfunctions for x86-64 are:
-.TP
-.B ARCH_SET_FS
-Set the 64-bit base for the
-.I FS
-register to
-.IR addr .
-.TP
-.B ARCH_GET_FS
-Return the 64-bit base value for the
-.I FS
-register of the current thread in the
-.I unsigned long
-pointed to by
-.IR addr .
-.TP
-.B ARCH_SET_GS
-Set the 64-bit base for the
-.I GS
-register to
-.IR addr .
-.TP
-.B ARCH_GET_GS
-Return the 64-bit base value for the
-.I GS
-register of the current thread in the
-.I unsigned long
-pointed to by
-.IR addr .
-.SH RETURN VALUE
-On success,
-.BR arch_prctl ()
-returns 0; on error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-.I addr
-points to an unmapped address or is outside the process address space.
-.TP
-.B EINVAL
-.I code
-is not a valid subcommand.
-.TP
-.B EPERM
-.I addr
-is outside the process address space.
-.\" .SH AUTHOR
-.\" Man page written by Andi Kleen.
-.SH CONFORMING TO
-.BR arch_prctl ()
-is a Linux/x86-64 extension and should not be used in programs intended
-to be portable.
-.SH NOTES
-.BR arch_prctl ()
-is supported only on Linux/x86-64 for 64-bit programs currently.
-
-The 64-bit base changes when a new 32-bit segment selector is loaded.
-
-.B ARCH_SET_GS
-is disabled in some kernels.
-
-Context switches for 64-bit segment bases are rather expensive.
-It may be a faster alternative to set a 32-bit base using a
-segment selector by setting up an LDT with
-.BR modify_ldt (2)
-or using the
-.BR set_thread_area (2)
-system call in kernel 2.5 or later.
-.BR arch_prctl ()
-is needed only when you want to set bases that are larger than 4GB.
-Memory in the first 2GB of address space can be allocated by using
-.BR mmap (2)
-with the
-.B MAP_32BIT
-flag.
-
-As of version 2.7, glibc provides no prototype for
-.BR arch_prctl ().
-You have to declare it yourself for now.
-This may be fixed in future glibc versions.
-
-.I FS
-may be already used by the threading library.
-.SH SEE ALSO
-.BR mmap (2),
-.BR modify_ldt (2),
-.BR prctl (2),
-.BR set_thread_area (2)
-
-AMD X86-64 Programmer's manual
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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