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. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * $FreeBSD$ 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 #include <sys/proc.h> 51 #include <sys/vnode.h> 52 53 #include <machine/reg.h> 54 55 #include <fs/procfs/procfs.h> 56 57 #include <vm/vm.h> 58 59 int 60 procfs_dodbregs(curp, p, pfs, uio) 61 struct proc *curp; 62 struct proc *p; 63 struct pfsnode *pfs; 64 struct uio *uio; 65 { 66 int error; 67 struct dbreg r; 68 char *kv; 69 int kl; 70 71 if (p_candebug(curp, p)) 72 return (EPERM); 73 kl = sizeof(r); 74 kv = (char *) &r; 75 76 kv += uio->uio_offset; 77 kl -= uio->uio_offset; 78 if (kl > uio->uio_resid) 79 kl = uio->uio_resid; 80 81 PHOLD(p); 82 83 if (kl < 0) 84 error = EINVAL; 85 else 86 error = procfs_read_dbregs(p, &r); 87 if (error == 0) 88 error = uiomove(kv, kl, uio); 89 if (error == 0 && uio->uio_rw == UIO_WRITE) { 90 if (p->p_stat != SSTOP) 91 error = EBUSY; 92 else 93 error = procfs_write_dbregs(p, &r); 94 } 95 PRELE(p); 96 97 uio->uio_offset = 0; 98 return (error); 99 } 100 101 int 102 procfs_validdbregs(p) 103 struct proc *p; 104 { 105 106 return ((p->p_flag & P_SYSTEM) == 0); 107 } 108