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/sysent.h> 55 #include <sys/uio.h> 56 57 #include <machine/reg.h> 58 59 #include <fs/pseudofs/pseudofs.h> 60 #include <fs/procfs/procfs.h> 61 62 #ifdef COMPAT_FREEBSD32 63 #include <sys/procfs.h> 64 #include <machine/fpu.h> 65 66 /* 67 * PROC(write, dbregs, td2, &r) becomes 68 * proc_write_dbregs(td2, &r) or 69 * proc_write_dbregs32(td2, &r32) 70 * 71 * UIOMOVE_FROMBUF(r, uio) becomes 72 * uiomove_frombuf(&r, sizeof(r), uio) or 73 * uiomove_frombuf(&r32, sizeof(r32), uio) 74 */ 75 #define PROC(d, w, t, r) wrap32 ? \ 76 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \ 77 proc_ ## d ## _ ## w(t, r) 78 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \ 79 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \ 80 uiomove_frombuf(& k, sizeof(k), u) 81 #else 82 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r) 83 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u) 84 #endif 85 86 int 87 procfs_doprocdbregs(PFS_FILL_ARGS) 88 { 89 int error; 90 struct dbreg r; 91 struct thread *td2; 92 #ifdef COMPAT_FREEBSD32 93 struct dbreg32 r32; 94 int wrap32 = 0; 95 #endif 96 97 if (uio->uio_offset != 0) 98 return (0); 99 100 PROC_LOCK(p); 101 PROC_ASSERT_HELD(p); 102 if (p_candebug(td, p) != 0) { 103 PROC_UNLOCK(p); 104 return (EPERM); 105 } 106 107 td2 = FIRST_THREAD_IN_PROC(p); 108 #ifdef COMPAT_FREEBSD32 109 if (SV_CURPROC_FLAG(SV_ILP32)) { 110 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32) == 0) { 111 PROC_UNLOCK(p); 112 return (EINVAL); 113 } 114 wrap32 = 1; 115 memset(&r32, 0, sizeof(r32)); 116 } else 117 #endif 118 memset(&r, 0, sizeof(r)); 119 error = PROC(read, dbregs, td2, &r); 120 if (error == 0) { 121 PROC_UNLOCK(p); 122 error = UIOMOVE_FROMBUF(r, uio); 123 PROC_LOCK(p); 124 } 125 if (error == 0 && uio->uio_rw == UIO_WRITE) { 126 if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */ 127 error = EBUSY; 128 else 129 /* XXXKSE: */ 130 error = PROC(write, dbregs, td2, &r); 131 } 132 PROC_UNLOCK(p); 133 134 return (error); 135 } 136