1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1993 Jan-Simon Pendry 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jan-Simon Pendry. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94 36 * 37 * From: 38 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $ 39 * $FreeBSD$ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/proc.h> 47 #include <sys/ptrace.h> 48 #include <sys/sysent.h> 49 #include <sys/uio.h> 50 51 #include <machine/reg.h> 52 53 #include <fs/pseudofs/pseudofs.h> 54 #include <fs/procfs/procfs.h> 55 56 #ifdef COMPAT_FREEBSD32 57 #include <sys/procfs.h> 58 #include <machine/fpu.h> 59 60 /* 61 * PROC(write, regs, td2, &r) becomes 62 * proc_write_regs(td2, &r) or 63 * proc_write_regs32(td2, &r32) 64 * 65 * UIOMOVE_FROMBUF(r, uio) becomes 66 * uiomove_frombuf(&r, sizeof(r), uio) or 67 * uiomove_frombuf(&r32, sizeof(r32), uio) 68 */ 69 #define PROC(d, w, t, r) wrap32 ? \ 70 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \ 71 proc_ ## d ## _ ## w(t, r) 72 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \ 73 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \ 74 uiomove_frombuf(& k, sizeof(k), u) 75 #else 76 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r) 77 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u) 78 #endif 79 80 int 81 procfs_doprocregs(PFS_FILL_ARGS) 82 { 83 int error; 84 struct reg r; 85 struct thread *td2; 86 #ifdef COMPAT_FREEBSD32 87 struct reg32 r32; 88 int wrap32 = 0; 89 #endif 90 91 if (uio->uio_offset != 0) 92 return (0); 93 94 PROC_LOCK(p); 95 PROC_ASSERT_HELD(p); 96 if (p_candebug(td, p)) { 97 PROC_UNLOCK(p); 98 return (EPERM); 99 } 100 if (!P_SHOULDSTOP(p)) { 101 PROC_UNLOCK(p); 102 return (EBUSY); 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, regs, 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)) 125 error = EBUSY; 126 else 127 /* XXXKSE: */ 128 error = PROC(write, regs, td2, &r); 129 } 130 PROC_UNLOCK(p); 131 132 return (error); 133 } 134