1 /* 2 * Copyright (c) 1993 Jan-Simon Pendry 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)procfs_fpregs.c 8.2 (Berkeley) 6/15/94 34 * 35 * From: 36 * $FreeBSD: src/sys/miscfs/procfs/procfs_fpregs.c,v 1.11.2.3 2002/01/22 17:22:59 nectar Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/uio.h> 41 #include <sys/proc.h> 42 #include <sys/priv.h> 43 #include <sys/vnode.h> 44 #include <sys/reg.h> 45 #include <vfs/procfs/procfs.h> 46 #include <vm/vm.h> 47 48 int 49 procfs_dofpregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs, 50 struct uio *uio) 51 { 52 struct proc *p = lp->lwp_proc; 53 int error; 54 struct fpreg r; 55 56 /* Can't trace a process that's currently exec'ing. */ 57 if ((p->p_flags & P_INEXEC) != 0) 58 return EAGAIN; 59 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred)) 60 return EPERM; 61 62 LWPHOLD(lp); 63 error = procfs_read_fpregs(lp, &r); 64 if (error == 0) 65 error = uiomove_frombuf(&r, sizeof(r), uio); 66 if (error == 0 && uio->uio_rw == UIO_WRITE) { 67 if (lp->lwp_stat != LSSTOP) 68 error = EBUSY; 69 else 70 error = procfs_write_fpregs(lp, &r); 71 } 72 LWPRELE(lp); 73 uio->uio_offset = 0; 74 75 return (error); 76 } 77 78 int 79 procfs_validfpregs(struct lwp *lp) 80 { 81 return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0); 82 } 83