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document MD ways to access private data for some platforms

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yamt 2013-09-06 17:54:09 +00:00
parent 3e6e9bd41e
commit cfc4d5466a
1 changed files with 22 additions and 2 deletions
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24
lib/libc/sys/_lwp_getprivate.2
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@ -1,4 +1,4 @@
.\" $NetBSD: _lwp_getprivate.2,v 1.4 2008/04/30 13:10:51 martin Exp $
.\" $NetBSD: _lwp_getprivate.2,v 1.5 2013/09/06 17:54:09 yamt Exp $
.\"
.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -27,7 +27,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd January 16, 2003
.Dd September 7, 2013
.Dt _LWP_GETPRIVATE 2
.Os
.Sh NAME
@ -50,6 +50,26 @@ in a location private to the LWP.
.Pp
.Fn _lwp_getprivate
returns the pointer to private data for the LWP.
.Pp
Some platforms provide alternative ways quicker than
.Fn _lwp_getprivate
to use the pointer.
.Bl -tag -width amd64
.It alpha
The pointer can be retrieved by call_pal PAL_rdunique.
.It amd64
The base address of
.Dv %fs
register is set to the pointer so that the private data can be
accessed using the selector.
.It i386
The base address of
.Dv %gs
register is set to the pointer so that the private data can be
accessed using the selector.
.It sparc
.Dv %g7
register is set to the pointer.
.Sh ERRORS
The
.Fn _lwp_getprivate