freebsd_ptrace.c revision 1.3.2.2
1 /* $NetBSD: freebsd_ptrace.c,v 1.3.2.2 2001/11/14 19:12:56 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 1.3.2.2 2001/11/14 19:12:56 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/syscallargs.h> 57 58 #include <machine/reg.h> 59 #include <machine/freebsd_machdep.h> 60 61 #include <compat/freebsd/freebsd_syscallargs.h> 62 #include <compat/common/compat_util.h> 63 #include <compat/freebsd/freebsd_ptrace.h> 64 65 /* 66 * Process debugging system call. 67 */ 68 int 69 freebsd_sys_ptrace(l, v, retval) 70 struct lwp *l; 71 void *v; 72 register_t *retval; 73 { 74 struct freebsd_sys_ptrace_args /* { 75 syscallarg(int) req; 76 syscallarg(pid_t) pid; 77 syscallarg(caddr_t) addr; 78 syscallarg(int) data; 79 } */ *uap = v; 80 struct proc *p = l->l_proc; 81 int error; 82 caddr_t sg; 83 struct { 84 struct reg regs; 85 struct fpreg fpregs; 86 } *nrp; 87 struct sys_ptrace_args npa; 88 struct freebsd_ptrace_reg fr; 89 90 switch (SCARG(uap, req)) { 91 #ifdef PT_STEP 92 case FREEBSD_PT_STEP: 93 SCARG(&npa, req) = PT_STEP; 94 SCARG(&npa, pid) = SCARG(uap, pid); 95 SCARG(&npa, addr) = SCARG(uap, addr); 96 SCARG(&npa, data) = SCARG(uap, data); 97 return sys_ptrace(l, &npa, retval); 98 #endif 99 case FREEBSD_PT_TRACE_ME: 100 case FREEBSD_PT_READ_I: 101 case FREEBSD_PT_READ_D: 102 case FREEBSD_PT_WRITE_I: 103 case FREEBSD_PT_WRITE_D: 104 case FREEBSD_PT_CONTINUE: 105 case FREEBSD_PT_KILL: 106 /* These requests are compatible with NetBSD */ 107 return sys_ptrace(l, uap, retval); 108 109 case FREEBSD_PT_READ_U: 110 case FREEBSD_PT_WRITE_U: 111 sg = stackgap_init(p->p_emul); 112 nrp = stackgap_alloc(&sg, sizeof(*nrp)); 113 #ifdef PT_GETREGS 114 SCARG(&npa, req) = PT_GETREGS; 115 SCARG(&npa, pid) = SCARG(uap, pid); 116 SCARG(&npa, addr) = (caddr_t)&nrp->regs; 117 if ((error = sys_ptrace(l, &npa, retval)) != 0) 118 return error; 119 #endif 120 #ifdef PT_GETFPREGS 121 SCARG(&npa, req) = PT_GETFPREGS; 122 SCARG(&npa, pid) = SCARG(uap, pid); 123 SCARG(&npa, addr) = (caddr_t)&nrp->fpregs; 124 if ((error = sys_ptrace(l, &npa, retval)) != 0) 125 return error; 126 #endif 127 netbsd_to_freebsd_ptrace_regs(&nrp->regs, &nrp->fpregs, &fr); 128 switch (SCARG(uap, req)) { 129 case FREEBSD_PT_READ_U: 130 return freebsd_ptrace_getregs(&fr, SCARG(uap, addr), 131 retval); 132 133 case FREEBSD_PT_WRITE_U: 134 error = freebsd_ptrace_setregs(&fr, 135 SCARG(uap, addr), SCARG(uap, data)); 136 if (error) 137 return error; 138 freebsd_to_netbsd_ptrace_regs(&fr, 139 &nrp->regs, &nrp->fpregs); 140 #ifdef PT_SETREGS 141 SCARG(&npa, req) = PT_SETREGS; 142 SCARG(&npa, pid) = SCARG(uap, pid); 143 SCARG(&npa, addr) = (caddr_t)&nrp->regs; 144 if ((error = sys_ptrace(l, &npa, retval)) != 0) 145 return error; 146 #endif 147 #ifdef PT_SETFPREGS 148 SCARG(&npa, req) = PT_SETFPREGS; 149 SCARG(&npa, pid) = SCARG(uap, pid); 150 SCARG(&npa, addr) = (caddr_t)&nrp->fpregs; 151 if ((error = sys_ptrace(l, &npa, retval)) != 0) 152 return error; 153 #endif 154 return 0; 155 } 156 157 default: /* It was not a legal request. */ 158 return (EINVAL); 159 } 160 161 #ifdef DIAGNOSTIC 162 panic("freebsd_ptrace: impossible"); 163 #endif 164 } 165
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