xref: /freebsd/sys/fs/procfs/procfs_fpregs.c (revision f44d9e24fbb396076ebabf326c6f80e166d3d4a5)
1a76d60f0SBruce Evans /*-
2df8bae1dSRodney W. Grimes  * Copyright (c) 1993 Jan-Simon Pendry
3df8bae1dSRodney W. Grimes  * Copyright (c) 1993
4df8bae1dSRodney W. Grimes  *	The Regents of the University of California.  All rights reserved.
5df8bae1dSRodney W. Grimes  *
6df8bae1dSRodney W. Grimes  * This code is derived from software contributed to Berkeley by
7df8bae1dSRodney W. Grimes  * Jan-Simon Pendry.
8df8bae1dSRodney W. Grimes  *
9df8bae1dSRodney W. Grimes  * Redistribution and use in source and binary forms, with or without
10df8bae1dSRodney W. Grimes  * modification, are permitted provided that the following conditions
11df8bae1dSRodney W. Grimes  * are met:
12df8bae1dSRodney W. Grimes  * 1. Redistributions of source code must retain the above copyright
13df8bae1dSRodney W. Grimes  *    notice, this list of conditions and the following disclaimer.
14df8bae1dSRodney W. Grimes  * 2. Redistributions in binary form must reproduce the above copyright
15df8bae1dSRodney W. Grimes  *    notice, this list of conditions and the following disclaimer in the
16df8bae1dSRodney W. Grimes  *    documentation and/or other materials provided with the distribution.
17df8bae1dSRodney W. Grimes  * 3. All advertising materials mentioning features or use of this software
18df8bae1dSRodney W. Grimes  *    must display the following acknowledgement:
19df8bae1dSRodney W. Grimes  *	This product includes software developed by the University of
20df8bae1dSRodney W. Grimes  *	California, Berkeley and its contributors.
21df8bae1dSRodney W. Grimes  * 4. Neither the name of the University nor the names of its contributors
22df8bae1dSRodney W. Grimes  *    may be used to endorse or promote products derived from this software
23df8bae1dSRodney W. Grimes  *    without specific prior written permission.
24df8bae1dSRodney W. Grimes  *
25df8bae1dSRodney W. Grimes  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26df8bae1dSRodney W. Grimes  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27df8bae1dSRodney W. Grimes  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28df8bae1dSRodney W. Grimes  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29df8bae1dSRodney W. Grimes  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30df8bae1dSRodney W. Grimes  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31df8bae1dSRodney W. Grimes  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32df8bae1dSRodney W. Grimes  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33df8bae1dSRodney W. Grimes  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34df8bae1dSRodney W. Grimes  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35df8bae1dSRodney W. Grimes  * SUCH DAMAGE.
36df8bae1dSRodney W. Grimes  *
37996c772fSJohn Dyson  *	@(#)procfs_fpregs.c	8.2 (Berkeley) 6/15/94
38df8bae1dSRodney W. Grimes  *
39996c772fSJohn Dyson  * From:
40a76d60f0SBruce Evans  *	$Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
41c3aac50fSPeter Wemm  * $FreeBSD$
42df8bae1dSRodney W. Grimes  */
43df8bae1dSRodney W. Grimes 
44df8bae1dSRodney W. Grimes #include <sys/param.h>
45fb919e4dSMark Murray #include <sys/systm.h>
46fb919e4dSMark Murray #include <sys/lock.h>
47fb919e4dSMark Murray #include <sys/mutex.h>
48df8bae1dSRodney W. Grimes #include <sys/proc.h>
493da32491SDag-Erling Smørgrav #include <sys/ptrace.h>
503a669c52SDag-Erling Smørgrav #include <sys/uio.h>
51fb919e4dSMark Murray 
52df8bae1dSRodney W. Grimes #include <machine/reg.h>
53fb919e4dSMark Murray 
543a669c52SDag-Erling Smørgrav #include <fs/pseudofs/pseudofs.h>
5599d300a1SRuslan Ermilov #include <fs/procfs/procfs.h>
56fb919e4dSMark Murray 
57df8bae1dSRodney W. Grimes int
583a669c52SDag-Erling Smørgrav procfs_doprocfpregs(PFS_FILL_ARGS)
59df8bae1dSRodney W. Grimes {
60df8bae1dSRodney W. Grimes 	int error;
61df8bae1dSRodney W. Grimes 	struct fpreg r;
62df8bae1dSRodney W. Grimes 	char *kv;
63df8bae1dSRodney W. Grimes 	int kl;
64df8bae1dSRodney W. Grimes 
65ff7299d9SJohn Baldwin 	PROC_LOCK(p);
66f44d9e24SJohn Baldwin 	if (p_candebug(td, p)) {
67ff7299d9SJohn Baldwin 		PROC_UNLOCK(p);
68a76d60f0SBruce Evans 		return (EPERM);
69ff7299d9SJohn Baldwin 	}
70df8bae1dSRodney W. Grimes 	kl = sizeof(r);
71df8bae1dSRodney W. Grimes 	kv = (char *) &r;
72df8bae1dSRodney W. Grimes 
73df8bae1dSRodney W. Grimes 	kv += uio->uio_offset;
74df8bae1dSRodney W. Grimes 	kl -= uio->uio_offset;
75df8bae1dSRodney W. Grimes 	if (kl > uio->uio_resid)
76df8bae1dSRodney W. Grimes 		kl = uio->uio_resid;
77df8bae1dSRodney W. Grimes 
78ff7299d9SJohn Baldwin 	_PHOLD(p);
79df8bae1dSRodney W. Grimes 	if (kl < 0)
80df8bae1dSRodney W. Grimes 		error = EINVAL;
81df8bae1dSRodney W. Grimes 	else
82a76d60f0SBruce Evans 		/* XXXKSE: */
83079b7badSJulian Elischer 		error = proc_read_fpregs(FIRST_THREAD_IN_PROC(p), &r);
84df8bae1dSRodney W. Grimes 	if (error == 0)
85df8bae1dSRodney W. Grimes 		error = uiomove(kv, kl, uio);
86df8bae1dSRodney W. Grimes 	if (error == 0 && uio->uio_rw == UIO_WRITE) {
87df8bae1dSRodney W. Grimes 		if (p->p_stat != SSTOP)
88df8bae1dSRodney W. Grimes 			error = EBUSY;
89df8bae1dSRodney W. Grimes 		else
90a76d60f0SBruce Evans 			/* XXXKSE: */
91079b7badSJulian Elischer 			error = proc_write_fpregs(FIRST_THREAD_IN_PROC(p), &r);
92df8bae1dSRodney W. Grimes 	}
93ff7299d9SJohn Baldwin 	_PRELE(p);
94ff7299d9SJohn Baldwin 	PROC_UNLOCK(p);
95df8bae1dSRodney W. Grimes 
96df8bae1dSRodney W. Grimes 	uio->uio_offset = 0;
97df8bae1dSRodney W. Grimes 	return (error);
98df8bae1dSRodney W. Grimes }
99