/* $NetBSD: freebsd_ptrace.c,v 1.19 2009/11/23 00:46:06 rmind Exp $ */ /*- * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 */ /*- * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 */ #include __KERNEL_RCSID(0, "$NetBSD: freebsd_ptrace.c,v 1.19 2009/11/23 00:46:06 rmind Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Process debugging system call. */ int freebsd_sys_ptrace(struct lwp *l, const struct freebsd_sys_ptrace_args *uap, register_t *retval) { /* { syscallarg(int) req; syscallarg(pid_t) pid; syscallarg(void *) addr; syscallarg(int) data; } */ struct sys_ptrace_args npa; sy_call_t *fn = sysent[SYS_ptrace].sy_call; switch (SCARG(uap, req)) { #ifdef PT_STEP case FREEBSD_PT_STEP: SCARG(&npa, req) = PT_STEP; SCARG(&npa, pid) = SCARG(uap, pid); SCARG(&npa, addr) = SCARG(uap, addr); SCARG(&npa, data) = SCARG(uap, data); return (*fn)(l, &npa, retval); #endif case FREEBSD_PT_TRACE_ME: case FREEBSD_PT_READ_I: case FREEBSD_PT_READ_D: case FREEBSD_PT_WRITE_I: case FREEBSD_PT_WRITE_D: case FREEBSD_PT_CONTINUE: case FREEBSD_PT_KILL: /* These requests are compatible with NetBSD */ return (*fn)(l, (const void *)uap, retval); #if 0 /* * XXX: I've commented out this code, it is broken on too many fronts to fix. * 1) It is doing an unlocked read-modify-write cycle on process that * I assume might be running! * and in code that might sleep (due to a pagefault), never mind * what happens on an SMP system * 2) It accesses data in userspace without using copyin/out. * 3) It all looks like a nasty hack that isn't likely to work. * 4) It uses the stackgap. * dsl June 2007 */ case FREEBSD_PT_READ_U: case FREEBSD_PT_WRITE_U: { int error; struct { struct reg regs; struct fpreg fpregs; } *nrp; struct freebsd_ptrace_reg fr; sg = stackgap_init(p, 0); nrp = stackgap_alloc(p, &sg, sizeof(*nrp)); #ifdef PT_GETREGS SCARG(&npa, req) = PT_GETREGS; SCARG(&npa, pid) = SCARG(uap, pid); SCARG(&npa, addr) = (void *)&nrp->regs; if ((error = (*fn)(l, &npa, retval)) != 0) return error; #endif #ifdef PT_GETFPREGS SCARG(&npa, req) = PT_GETFPREGS; SCARG(&npa, pid) = SCARG(uap, pid); SCARG(&npa, addr) = (void *)&nrp->fpregs; if ((error = (*fn)(l, &npa, retval)) != 0) return error; #endif netbsd_to_freebsd_ptrace_regs(&nrp->regs, &nrp->fpregs, &fr); switch (SCARG(uap, req)) { case FREEBSD_PT_READ_U: return freebsd_ptrace_getregs(&fr, SCARG(uap, addr), retval); case FREEBSD_PT_WRITE_U: error = freebsd_ptrace_setregs(&fr, SCARG(uap, addr), SCARG(uap, data)); if (error) return error; freebsd_to_netbsd_ptrace_regs(&fr, &nrp->regs, &nrp->fpregs); #ifdef PT_SETREGS SCARG(&npa, req) = PT_SETREGS; SCARG(&npa, pid) = SCARG(uap, pid); SCARG(&npa, addr) = (void *)&nrp->regs; if ((error = (*fn)(l, &npa, retval)) != 0) return error; #endif #ifdef PT_SETFPREGS SCARG(&npa, req) = PT_SETFPREGS; SCARG(&npa, pid) = SCARG(uap, pid); SCARG(&npa, addr) = (void *)&nrp->fpregs; if ((error = (*fn)(l, &npa, retval)) != 0) return error; #endif return 0; } } #endif default: /* It was not a legal request. */ return (EINVAL); } #ifdef DIAGNOSTIC panic("freebsd_ptrace: impossible"); #endif }