freebsd_ptrace.c revision 1.7.16.4
1 /* $NetBSD: freebsd_ptrace.c,v 1.7.16.4 2007/09/03 14:31:59 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 37 */ 38 39 /*- 40 * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: freebsd_ptrace.c,v 1.7.16.4 2007/09/03 14:31:59 yamt Exp $"); 75 76 #if defined(_KERNEL_OPT) 77 #include "opt_ptrace.h" 78 #endif 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/proc.h> 83 #include <sys/errno.h> 84 #include <sys/ptrace.h> 85 #include <sys/uio.h> 86 #include <sys/user.h> 87 #include <sys/mount.h> 88 #include <sys/syscallargs.h> 89 90 #include <compat/sys/signal.h> 91 #include <compat/sys/signalvar.h> 92 93 #include <machine/reg.h> 94 #include <machine/freebsd_machdep.h> 95 96 #include <compat/common/compat_util.h> 97 #include <compat/freebsd/freebsd_syscallargs.h> 98 #include <compat/freebsd/freebsd_ptrace.h> 99 100 /* 101 * Process debugging system call. 102 */ 103 int 104 freebsd_sys_ptrace(l, v, retval) 105 struct lwp *l; 106 void *v; 107 register_t *retval; 108 { 109 #if defined(PTRACE) || defined(_LKM) 110 struct freebsd_sys_ptrace_args /* { 111 syscallarg(int) req; 112 syscallarg(pid_t) pid; 113 syscallarg(void *) addr; 114 syscallarg(int) data; 115 } */ *uap = v; 116 struct sys_ptrace_args npa; 117 #ifdef _LKM 118 sy_call_t sys_ptrace = sysent[SYS_ptrace].sy_call; 119 #endif 120 121 switch (SCARG(uap, req)) { 122 #ifdef PT_STEP 123 case FREEBSD_PT_STEP: 124 SCARG(&npa, req) = PT_STEP; 125 SCARG(&npa, pid) = SCARG(uap, pid); 126 SCARG(&npa, addr) = SCARG(uap, addr); 127 SCARG(&npa, data) = SCARG(uap, data); 128 return sys_ptrace(l, &npa, retval); 129 #endif 130 case FREEBSD_PT_TRACE_ME: 131 case FREEBSD_PT_READ_I: 132 case FREEBSD_PT_READ_D: 133 case FREEBSD_PT_WRITE_I: 134 case FREEBSD_PT_WRITE_D: 135 case FREEBSD_PT_CONTINUE: 136 case FREEBSD_PT_KILL: 137 /* These requests are compatible with NetBSD */ 138 return sys_ptrace(l, uap, retval); 139 140 #if 0 141 /* 142 * XXX: I've commented out this code, it is broken on too many fronts to fix. 143 * 1) It is doing an unlocked read-modify-write cycle on process that 144 * I assume might be running! 145 * and in code that might sleep (due to a pagefault), never mind 146 * what happens on an SMP system 147 * 2) It accesses data in userspace without using copyin/out. 148 * 3) It all looks like a nasty hack that isn't likely to work. 149 * 4) It uses the stackgap. 150 * dsl June 2007 151 */ 152 case FREEBSD_PT_READ_U: 153 case FREEBSD_PT_WRITE_U: 154 { 155 int error; 156 struct { 157 struct reg regs; 158 struct fpreg fpregs; 159 } *nrp; 160 struct freebsd_ptrace_reg fr; 161 sg = stackgap_init(p, 0); 162 nrp = stackgap_alloc(p, &sg, sizeof(*nrp)); 163 #ifdef PT_GETREGS 164 SCARG(&npa, req) = PT_GETREGS; 165 SCARG(&npa, pid) = SCARG(uap, pid); 166 SCARG(&npa, addr) = (void *)&nrp->regs; 167 if ((error = sys_ptrace(l, &npa, retval)) != 0) 168 return error; 169 #endif 170 #ifdef PT_GETFPREGS 171 SCARG(&npa, req) = PT_GETFPREGS; 172 SCARG(&npa, pid) = SCARG(uap, pid); 173 SCARG(&npa, addr) = (void *)&nrp->fpregs; 174 if ((error = sys_ptrace(l, &npa, retval)) != 0) 175 return error; 176 #endif 177 netbsd_to_freebsd_ptrace_regs(&nrp->regs, &nrp->fpregs, &fr); 178 switch (SCARG(uap, req)) { 179 case FREEBSD_PT_READ_U: 180 return freebsd_ptrace_getregs(&fr, SCARG(uap, addr), 181 retval); 182 183 case FREEBSD_PT_WRITE_U: 184 error = freebsd_ptrace_setregs(&fr, 185 SCARG(uap, addr), SCARG(uap, data)); 186 if (error) 187 return error; 188 freebsd_to_netbsd_ptrace_regs(&fr, 189 &nrp->regs, &nrp->fpregs); 190 #ifdef PT_SETREGS 191 SCARG(&npa, req) = PT_SETREGS; 192 SCARG(&npa, pid) = SCARG(uap, pid); 193 SCARG(&npa, addr) = (void *)&nrp->regs; 194 if ((error = sys_ptrace(l, &npa, retval)) != 0) 195 return error; 196 #endif 197 #ifdef PT_SETFPREGS 198 SCARG(&npa, req) = PT_SETFPREGS; 199 SCARG(&npa, pid) = SCARG(uap, pid); 200 SCARG(&npa, addr) = (void *)&nrp->fpregs; 201 if ((error = sys_ptrace(l, &npa, retval)) != 0) 202 return error; 203 #endif 204 return 0; 205 } 206 } 207 #endif 208 209 default: /* It was not a legal request. */ 210 return (EINVAL); 211 } 212 213 #ifdef DIAGNOSTIC 214 panic("freebsd_ptrace: impossible"); 215 #endif 216 #else 217 return (ENOSYS); 218 #endif /* PTRACE || _LKM */ 219 } 220
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