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 * $FreeBSD: src/sys/miscfs/procfs/procfs_regs.c,v 1.10.2.3 2002/01/22 17:22:59 nectar Exp $ 41 * $DragonFly: src/sys/vfs/procfs/procfs_regs.c,v 1.2 2003/06/17 04:28:42 dillon Exp $ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/proc.h> 46 #include <sys/vnode.h> 47 #include <machine/reg.h> 48 #include <miscfs/procfs/procfs.h> 49 #include <vm/vm.h> 50 #include <vm/vm_extern.h> 51 52 int 53 procfs_doregs(curp, p, pfs, uio) 54 struct proc *curp; 55 struct proc *p; 56 struct pfsnode *pfs; 57 struct uio *uio; 58 { 59 int error; 60 struct reg r; 61 char *kv; 62 int kl; 63 64 /* Can't trace a process that's currently exec'ing. */ 65 if ((p->p_flag & P_INEXEC) != 0) 66 return EAGAIN; 67 if (!CHECKIO(curp, p) || p_trespass(curp, p)) 68 return EPERM; 69 kl = sizeof(r); 70 kv = (char *) &r; 71 72 kv += uio->uio_offset; 73 kl -= uio->uio_offset; 74 if (kl > uio->uio_resid) 75 kl = uio->uio_resid; 76 77 PHOLD(p); 78 79 if (kl < 0) 80 error = EINVAL; 81 else 82 error = procfs_read_regs(p, &r); 83 if (error == 0) 84 error = uiomove(kv, kl, uio); 85 if (error == 0 && uio->uio_rw == UIO_WRITE) { 86 if (p->p_stat != SSTOP) 87 error = EBUSY; 88 else 89 error = procfs_write_regs(p, &r); 90 } 91 PRELE(p); 92 93 uio->uio_offset = 0; 94 return (error); 95 } 96 97 int 98 procfs_validregs(p) 99 struct proc *p; 100 { 101 102 return ((p->p_flag & P_SYSTEM) == 0); 103 } 104