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