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 1.11 2007/02/19 01:14:24 corecode Exp $ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/proc.h> 46 #include <sys/priv.h> 47 #include <sys/vnode.h> 48 #include <sys/reg.h> 49 #include <vfs/procfs/procfs.h> 50 #include <vm/vm.h> 51 #include <vm/vm_extern.h> 52 53 int 54 procfs_doregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs, 55 struct uio *uio) 56 { 57 struct proc *p = lp->lwp_proc; 58 int error; 59 struct reg r; 60 char *kv; 61 int kl; 62 63 /* Can't trace a process that's currently exec'ing. */ 64 if ((p->p_flag & P_INEXEC) != 0) 65 return EAGAIN; 66 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred)) 67 return EPERM; 68 kl = sizeof(r); 69 kv = (char *) &r; 70 71 kv += uio->uio_offset; 72 kl -= uio->uio_offset; 73 if (kl > uio->uio_resid) 74 kl = uio->uio_resid; 75 76 LWPHOLD(lp); 77 78 error = procfs_read_regs(lp, &r); 79 if (error == 0) 80 error = uiomove_frombuf(&r, sizeof(r), uio); 81 if (error == 0 && uio->uio_rw == UIO_WRITE) { 82 if (p->p_stat != SSTOP) 83 error = EBUSY; 84 else 85 error = procfs_write_regs(lp, &r); 86 } 87 LWPRELE(lp); 88 89 uio->uio_offset = 0; 90 return (error); 91 } 92 93 int 94 procfs_validregs(struct lwp *lp) 95 { 96 return ((lp->lwp_proc->p_flag & P_SYSTEM) == 0); 97 } 98