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 * From: @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94 44 * 45 * From: 46 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $ 47 * $FreeBSD$ 48 */ 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/lock.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/ptrace.h> 56 #include <sys/uio.h> 57 58 #include <machine/reg.h> 59 60 #include <fs/pseudofs/pseudofs.h> 61 #include <fs/procfs/procfs.h> 62 63 int 64 procfs_doprocdbregs(PFS_FILL_ARGS) 65 { 66 int error; 67 struct dbreg r; 68 char *kv; 69 int kl; 70 71 PROC_LOCK(p); 72 if (p_candebug(td, p) != 0) { 73 PROC_UNLOCK(p); 74 return (EPERM); 75 } 76 kl = sizeof(r); 77 kv = (char *) &r; 78 79 kv += uio->uio_offset; 80 kl -= uio->uio_offset; 81 if (kl > uio->uio_resid) 82 kl = uio->uio_resid; 83 84 _PHOLD(p); 85 if (kl < 0) 86 error = EINVAL; 87 else 88 /* XXXKSE: */ 89 error = proc_read_dbregs(FIRST_THREAD_IN_PROC(p), &r); 90 if (error == 0) { 91 PROC_UNLOCK(p); 92 error = uiomove(kv, kl, uio); 93 PROC_LOCK(p); 94 } 95 if (error == 0 && uio->uio_rw == UIO_WRITE) { 96 if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */ 97 error = EBUSY; 98 else 99 /* XXXKSE: */ 100 error = proc_write_dbregs(FIRST_THREAD_IN_PROC(p), &r); 101 } 102 _PRELE(p); 103 PROC_UNLOCK(p); 104 105 uio->uio_offset = 0; 106 return (error); 107 } 108