freebsd_ptrace.c revision 1.3.2.4
1 /* $NetBSD: freebsd_ptrace.c,v 1.3.2.4 2002/05/29 21:32:19 nathanw Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1982, 1986, 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. 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: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: freebsd_ptrace.c,v 1.3.2.4 2002/05/29 21:32:19 nathanw Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/lwp.h> 50 #include <sys/proc.h> 51 #include <sys/errno.h> 52 #include <sys/ptrace.h> 53 #include <sys/uio.h> 54 #include <sys/user.h> 55 #include <sys/mount.h> 56 #include <sys/sa.h> 57 #include <sys/syscallargs.h> 58 59 #include <machine/reg.h> 60 #include <machine/freebsd_machdep.h> 61 62 #include <compat/freebsd/freebsd_syscallargs.h> 63 #include <compat/common/compat_util.h> 64 #include <compat/freebsd/freebsd_ptrace.h> 65 66 /* 67 * Process debugging system call. 68 */ 69 int 70 freebsd_sys_ptrace(l, v, retval) 71 struct lwp *l; 72 void *v; 73 register_t *retval; 74 { 75 struct freebsd_sys_ptrace_args /* { 76 syscallarg(int) req; 77 syscallarg(pid_t) pid; 78 syscallarg(caddr_t) addr; 79 syscallarg(int) data; 80 } */ *uap = v; 81 struct proc *p = l->l_proc; 82 int error; 83 caddr_t sg; 84 struct { 85 struct reg regs; 86 struct fpreg fpregs; 87 } *nrp; 88 struct sys_ptrace_args npa; 89 struct freebsd_ptrace_reg fr; 90 91 switch (SCARG(uap, req)) { 92 #ifdef PT_STEP 93 case FREEBSD_PT_STEP: 94 SCARG(&npa, req) = PT_STEP; 95 SCARG(&npa, pid) = SCARG(uap, pid); 96 SCARG(&npa, addr) = SCARG(uap, addr); 97 SCARG(&npa, data) = SCARG(uap, data); 98 return sys_ptrace(l, &npa, retval); 99 #endif 100 case FREEBSD_PT_TRACE_ME: 101 case FREEBSD_PT_READ_I: 102 case FREEBSD_PT_READ_D: 103 case FREEBSD_PT_WRITE_I: 104 case FREEBSD_PT_WRITE_D: 105 case FREEBSD_PT_CONTINUE: 106 case FREEBSD_PT_KILL: 107 /* These requests are compatible with NetBSD */ 108 return sys_ptrace(l, uap, retval); 109 110 case FREEBSD_PT_READ_U: 111 case FREEBSD_PT_WRITE_U: 112 sg = stackgap_init(p, 0); 113 nrp = stackgap_alloc(p, &sg, sizeof(*nrp)); 114 #ifdef PT_GETREGS 115 SCARG(&npa, req) = PT_GETREGS; 116 SCARG(&npa, pid) = SCARG(uap, pid); 117 SCARG(&npa, addr) = (caddr_t)&nrp->regs; 118 if ((error = sys_ptrace(l, &npa, retval)) != 0) 119 return error; 120 #endif 121 #ifdef PT_GETFPREGS 122 SCARG(&npa, req) = PT_GETFPREGS; 123 SCARG(&npa, pid) = SCARG(uap, pid); 124 SCARG(&npa, addr) = (caddr_t)&nrp->fpregs; 125 if ((error = sys_ptrace(l, &npa, retval)) != 0) 126 return error; 127 #endif 128 netbsd_to_freebsd_ptrace_regs(&nrp->regs, &nrp->fpregs, &fr); 129 switch (SCARG(uap, req)) { 130 case FREEBSD_PT_READ_U: 131 return freebsd_ptrace_getregs(&fr, SCARG(uap, addr), 132 retval); 133 134 case FREEBSD_PT_WRITE_U: 135 error = freebsd_ptrace_setregs(&fr, 136 SCARG(uap, addr), SCARG(uap, data)); 137 if (error) 138 return error; 139 freebsd_to_netbsd_ptrace_regs(&fr, 140 &nrp->regs, &nrp->fpregs); 141 #ifdef PT_SETREGS 142 SCARG(&npa, req) = PT_SETREGS; 143 SCARG(&npa, pid) = SCARG(uap, pid); 144 SCARG(&npa, addr) = (caddr_t)&nrp->regs; 145 if ((error = sys_ptrace(l, &npa, retval)) != 0) 146 return error; 147 #endif 148 #ifdef PT_SETFPREGS 149 SCARG(&npa, req) = PT_SETFPREGS; 150 SCARG(&npa, pid) = SCARG(uap, pid); 151 SCARG(&npa, addr) = (caddr_t)&nrp->fpregs; 152 if ((error = sys_ptrace(l, &npa, retval)) != 0) 153 return error; 154 #endif 155 return 0; 156 } 157 158 default: /* It was not a legal request. */ 159 return (EINVAL); 160 } 161 162 #ifdef DIAGNOSTIC 163 panic("freebsd_ptrace: impossible"); 164 #endif 165 } 166
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