.\"
.\" This file and its contents are supplied under the terms of the
.\" Common Development and Distribution License ("CDDL"), version 1.0.
.\" You may only use this file in accordance with the terms of version
.\" 1.0 of the CDDL.
.\"
.\" A full copy of the text of the CDDL should have accompanied this
.\" source.  A copy of the CDDL is also available via the Internet at
.\" http://www.illumos.org/license/CDDL.
.\"
.\"
.\" Copyright 2015 Joyent, Inc.
.\"
.Dd May 11, 2016
.Dt PLWP_GETASRS 3PROC
.Os
.Sh NAME
.Nm Plwp_getasrs ,
.Nm Plwp_setasrs
.Nd get and set SPARCv9 ancillary state registers
.Sh SYNOPSIS
.Lb libproc
.In libproc.h
.Ft int
.Fo Plwp_getasrs
.Fa "struct ps_prochandle *P"
.Fa "lwpid_t lwpid"
.Fa "asrset_t asrs"
.Fc
.Ft int
.Fo Plwp_setasrs
.Fa "struct ps_prochandle *P"
.Fa "lwpid_t lwpid"
.Fa "const asrset_t asrs"
.Fc
.Sh DESCRIPTION
The
.Fn Plwp_getasrs
and
.Fn Plwp_setasrs
functions get and set the ancillary thread-specific register set of the
thread
.Fa lwpid
in the process handle
.Fa P .
.Pp
The ancillary state registers are only present on 64-bit
.Sy SPARCv9
processes. They contain information that is specific to the platform and
are not included in the information obtained through functions such as
.Xr Plwp_getregs 3PROC ,
.Xr Plwp_getfpregs 3PROC ,
and
.Xr Plwp_getxregs 3PROC .
.Pp
The Plwp_getasrs
function reads the ancillary registers into
.Fa asrs ,
while the
.Fn Plwp_setasrs
sets the thread's ancillary registers to the values provided by
.Fa asrs .
.Pp
Processes should be stopped prior to obtaining the register state of
individual threads. Processes may be stopped with
.Xr Pstop 3PROC .
.Pp
The
.Sy asrset_t
structure is described in
.Xr proc 4 .
.Pp
One may not set the register values of a process that is not an active
process, e.g. a process handle that refers to a file or a core file.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Plwp_getasrs
and
.Fn Plwp_setasrs
functions return
.Sy 0
and get or set the register state. Otherwise,
.Sy -1
is returned and
.Sy errno
is set to indicate the error.
.Sh ERRORS
For a full list of possible errors see the
.Sy DIAGNOSTICS
section in
.Xr proc 4 .
.Pp
The
.Fn Plwp_getasrs
and
.Fn Plwp_setasrs
function will fail if:
.Bl -tag -width Er
.It Er ENODATA
The process handle
.Fa P
does not have any ancillary register state information.
.It Er EBUSY
The process handle
.Fa P
refers to a live process and it is not stopped.
.It Er ENOENT
The process handle
.Fa P
refers to a live process and there is no thread with id
.Fa lwpid
or it is not a 64-bit SPARCv9 process.
.It Er EINVAL
The process handle
.Fa P
refers to a core file and there is no thread with id
.Fa lwpid .
.El
.Sh ARCHITECTURE
The
.Fn Plwp_getasrs
and
.Fn Plwp_setasrs
functions are only available on
64-bit
.Sy SPARCv9
platforms.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB ,
.Xr Plwp_getfpregs 3PROC ,
.Xr Plwp_getregs 3PROC ,
.Xr Plwp_setregs 3PROC ,
.Xr Plwp_setregs 3PROC ,
.Xr Pstop 3PROC ,
.Xr proc 4