NetBSD-5.0.2/sys/compat/freebsd/freebsd_ptrace.c
/* $NetBSD: freebsd_ptrace.c,v 1.17 2007/12/20 23:02:47 dsl 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_ptrace.c,v 1.17 2007/12/20 23:02:47 dsl Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ptrace.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/ptrace.h>
#include <sys/uio.h>
#include <sys/user.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <compat/sys/signal.h>
#include <compat/sys/signalvar.h>
#include <machine/reg.h>
#include <machine/freebsd_machdep.h>
#include <compat/common/compat_util.h>
#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/freebsd/freebsd_ptrace.h>
/*
* Process debugging system call.
*/
int
freebsd_sys_ptrace(struct lwp *l, const struct freebsd_sys_ptrace_args *uap, register_t *retval)
{
#if defined(PTRACE) || defined(_LKM)
/* {
syscallarg(int) req;
syscallarg(pid_t) pid;
syscallarg(void *) addr;
syscallarg(int) data;
} */
struct sys_ptrace_args npa;
#ifdef _LKM
sy_call_t sys_ptrace = sysent[SYS_ptrace].sy_call;
#endif
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 sys_ptrace(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 sys_ptrace(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 = sys_ptrace(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 = sys_ptrace(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 = sys_ptrace(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 = sys_ptrace(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
#else
return (ENOSYS);
#endif /* PTRACE || _LKM */
}