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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94 38 * 39 * From: 40 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $ 41 * $FreeBSD$ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/proc.h> 49 #include <sys/ptrace.h> 50 #include <sys/uio.h> 51 52 #include <machine/reg.h> 53 54 #include <fs/pseudofs/pseudofs.h> 55 #include <fs/procfs/procfs.h> 56 57 int 58 procfs_doprocregs(PFS_FILL_ARGS) 59 { 60 int error; 61 struct reg r; 62 char *kv; 63 int kl; 64 65 PROC_LOCK(p); 66 if (p_candebug(td, p)) { 67 PROC_UNLOCK(p); 68 return (EPERM); 69 } 70 kl = sizeof(r); 71 kv = (char *) &r; 72 73 kv += uio->uio_offset; 74 kl -= uio->uio_offset; 75 if (kl > uio->uio_resid) 76 kl = uio->uio_resid; 77 78 _PHOLD(p); 79 PROC_UNLOCK(p); 80 if (kl < 0) 81 error = EINVAL; 82 else 83 /* XXXKSE: */ 84 error = proc_read_regs(FIRST_THREAD_IN_PROC(p), &r); 85 if (error == 0) 86 error = uiomove(kv, kl, uio); 87 PROC_LOCK(p); 88 if (error == 0 && uio->uio_rw == UIO_WRITE) { 89 if (!P_SHOULDSTOP(p)) 90 error = EBUSY; 91 else 92 /* XXXKSE: */ 93 error = proc_write_regs(FIRST_THREAD_IN_PROC(p), &r); 94 } 95 _PRELE(p); 96 PROC_UNLOCK(p); 97 98 uio->uio_offset = 0; 99 return (error); 100 } 101