1 /*- 2 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Jan-Simon Pendry under the following copyrights and conditions: 7 * 8 * Copyright (c) 1993 Jan-Simon Pendry 9 * Copyright (c) 1993 10 * The Regents of the University of California. All rights reserved. 11 * 12 * This code is derived from software contributed to Berkeley by 13 * Jan-Simon Pendry. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * $FreeBSD: src/sys/miscfs/procfs/procfs_dbregs.c,v 1.4.2.3 2002/01/22 17:22:59 nectar Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/uio.h> 44 #include <sys/proc.h> 45 #include <sys/caps.h> 46 #include <sys/vnode.h> 47 #include <sys/reg.h> 48 #include <vfs/procfs/procfs.h> 49 #include <vm/vm.h> 50 51 int 52 procfs_dodbregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs, 53 struct uio *uio) 54 { 55 struct proc *p = lp->lwp_proc; 56 int error; 57 struct dbreg r; 58 59 /* Can't trace a process that's currently exec'ing. */ 60 if ((p->p_flags & P_INEXEC) != 0) 61 return EAGAIN; 62 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred)) 63 return (EPERM); 64 LWPHOLD(lp); 65 error = procfs_read_dbregs(lp, &r); 66 if (error == 0) 67 error = uiomove_frombuf(&r, sizeof(r), uio); 68 if (error == 0 && uio->uio_rw == UIO_WRITE) { 69 if (lp->lwp_stat != LSSTOP) 70 error = EBUSY; 71 else 72 error = procfs_write_dbregs(lp, &r); 73 } 74 LWPRELE(lp); 75 uio->uio_offset = 0; 76 77 return (error); 78 } 79 80 int 81 procfs_validdbregs(struct lwp *lp) 82 { 83 return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0); 84 } 85