1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry under the following copyrights and conditions: 9 * 10 * Copyright (c) 1993 Jan-Simon Pendry 11 * Copyright (c) 1993 12 * The Regents of the University of California. All rights reserved. 13 * 14 * This code is derived from software contributed to Berkeley by 15 * Jan-Simon Pendry. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 3. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * From: @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94 42 * 43 * From: 44 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $ 45 * $FreeBSD$ 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/proc.h> 53 #include <sys/ptrace.h> 54 #include <sys/uio.h> 55 56 #include <fs/pseudofs/pseudofs.h> 57 #include <fs/procfs/procfs.h> 58 59 #ifdef COMPAT_FREEBSD32 60 #include <sys/sysent.h> 61 #include <sys/procfs.h> 62 #include <machine/fpu.h> 63 64 /* 65 * PROC(write, dbregs, td2, &r) becomes 66 * proc_write_dbregs(td2, &r) or 67 * proc_write_dbregs32(td2, &r32) 68 * 69 * UIOMOVE_FROMBUF(r, uio) becomes 70 * uiomove_frombuf(&r, sizeof(r), uio) or 71 * uiomove_frombuf(&r32, sizeof(r32), uio) 72 */ 73 #define PROC(d, w, t, r) wrap32 ? \ 74 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \ 75 proc_ ## d ## _ ## w(t, r) 76 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \ 77 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \ 78 uiomove_frombuf(& k, sizeof(k), u) 79 #else 80 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r) 81 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u) 82 #endif 83 84 int 85 procfs_doprocdbregs(PFS_FILL_ARGS) 86 { 87 int error; 88 struct dbreg r; 89 struct thread *td2; 90 #ifdef COMPAT_FREEBSD32 91 struct dbreg32 r32; 92 int wrap32 = 0; 93 #endif 94 95 if (uio->uio_offset != 0) 96 return (0); 97 98 PROC_LOCK(p); 99 PROC_ASSERT_HELD(p); 100 if (p_candebug(td, p) != 0) { 101 PROC_UNLOCK(p); 102 return (EPERM); 103 } 104 105 td2 = FIRST_THREAD_IN_PROC(p); 106 #ifdef COMPAT_FREEBSD32 107 if (SV_CURPROC_FLAG(SV_ILP32)) { 108 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32) == 0) { 109 PROC_UNLOCK(p); 110 return (EINVAL); 111 } 112 wrap32 = 1; 113 memset(&r32, 0, sizeof(r32)); 114 } else 115 #endif 116 memset(&r, 0, sizeof(r)); 117 error = PROC(read, dbregs, td2, &r); 118 if (error == 0) { 119 PROC_UNLOCK(p); 120 error = UIOMOVE_FROMBUF(r, uio); 121 PROC_LOCK(p); 122 } 123 if (error == 0 && uio->uio_rw == UIO_WRITE) { 124 if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */ 125 error = EBUSY; 126 else 127 /* XXXKSE: */ 128 error = PROC(write, dbregs, td2, &r); 129 } 130 PROC_UNLOCK(p); 131 132 return (error); 133 } 134