[apple/xnu.git] / bsd / kern / mach_process.c

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*-
 * 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. 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 <machine/reg.h>
#include <machine/psl.h>

#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/sysctl.h>
#include <sys/wait.h>

#include <sys/mount.h>

#include <kern/task.h>
#include <kern/thread.h>
#include <mach/machine/thread_status.h>

/* Macros to clear/set/test flags. */
#define	SET(t, f)	(t) |= (f)
#define	CLR(t, f)	(t) &= ~(f)
#define	ISSET(t, f)	((t) & (f))

void psignal_lock __P((struct proc *, int, int));
int isinferior __P((struct proc *, struct proc *));

/*
 * sys-trace system call.
 */
struct ptrace_args {
	int	req;
	pid_t pid;
	caddr_t	addr;
	int	data;
};

int
ptrace(p, uap, retval)
	struct proc *p;
	struct ptrace_args *uap;
	register_t *retval;
{
	struct proc *t = current_proc();	/* target process */
	vm_offset_t	start_addr, end_addr,
			kern_addr, offset;
	vm_size_t	size;
	task_t		task;
	thread_t	thread;
	thread_act_t	th_act;
	struct uthread 	*ut;
	int		*locr0;
	int error = 0;
#if defined(ppc)
	struct ppc_thread_state64 statep;
#elif	defined(i386)
	struct i386_saved_state statep;
#else
#error architecture not supported
#endif
	unsigned long state_count;
	int tr_sigexc = 0;


        if (uap->req == PT_DENY_ATTACH) {
	        if (ISSET(p->p_flag, P_TRACED)) {
				exit1(p, W_EXITCODE(ENOTSUP, 0), retval);
				/* drop funnel before we return */
				thread_funnel_set(kernel_flock, FALSE);
				thread_exception_return();
				/* NOTREACHED */
			}
		SET(p->p_flag, P_NOATTACH);

		return(0);
	}

	if (uap->req == PT_FORCEQUOTA) {
		if (is_suser()) {
			SET(t->p_flag, P_FORCEQUOTA);
			return (0);
		} else
			return (EPERM);
	}

	/*
	 *	Intercept and deal with "please trace me" request.
	 */	 
	if (uap->req == PT_TRACE_ME) {
		SET(p->p_flag, P_TRACED);
		/* Non-attached case, our tracer is our parent. */
		t->p_oppid = t->p_pptr->p_pid;
		return(0);
	}
	if (uap->req == PT_SIGEXC) {
		if (ISSET(p->p_flag, P_TRACED)) {
			SET(p->p_flag, P_SIGEXC);
			return(0);
		} else
			return(EINVAL);
	}

	/*
	 *	Locate victim, and make sure it is traceable.
	 */
	if ((t = pfind(uap->pid)) == NULL)
			return (ESRCH);


	/* We do not want ptrace to do anything with kernel, init 
	 * and mach_init
	 */
	if (uap->pid <=2 )
		return (EPERM);

	task = t->task;
	if (uap->req == PT_ATTACHEXC) {
		uap->req = PT_ATTACH;
		tr_sigexc = 1;
	}
	if (uap->req == PT_ATTACH) {

		/*
		 * You can't attach to a process if:
		 *	(1) it's the process that's doing the attaching,
		 */
		if (t->p_pid == p->p_pid)
			return (EINVAL);

		/*
		 *	(2) it's already being traced, or
		 */
		if (ISSET(t->p_flag, P_TRACED))
			return (EBUSY);

		/*
		 *	(3) it's not owned by you, or is set-id on exec
		 *	    (unless you're root).
		 */
		if ((t->p_cred->p_ruid != p->p_cred->p_ruid ||
			ISSET(t->p_flag, P_SUGID)) &&
		    (error = suser(p->p_ucred, &p->p_acflag)) != 0)
			return (error);

		if ((p->p_flag & P_TRACED) && isinferior(p, t))
			return(EPERM);

		if (ISSET(t->p_flag, P_NOATTACH)) {
			psignal(p, SIGSEGV);
			return (EBUSY);
		}
		SET(t->p_flag, P_TRACED);
		if (tr_sigexc) 
			SET(t->p_flag, P_SIGEXC);

		t->p_oppid = t->p_pptr->p_pid;
		if (t->p_pptr != p)
			proc_reparent(t, p);

		if (get_task_userstop(task) == 0 ) {
			t->p_xstat = 0;
			psignal(t, SIGSTOP);
		} else {
			t->p_xstat = SIGSTOP; 
			task_resume(task);       
		}
		return(0);
	}

	/*
	 * You can't do what you want to the process if:
	 *	(1) It's not being traced at all,
	 */
	if (!ISSET(t->p_flag, P_TRACED))
		return (EPERM);

	/*
	 *	(2) it's not being traced by _you_, or
	 */
	if (t->p_pptr != p)
		return (EBUSY);

	/*
	 *	(3) it's not currently stopped.
	 */
	if (t->p_stat != SSTOP)
		return (EBUSY);

	/*
	 *	Mach version of ptrace executes request directly here,
	 *	thus simplifying the interaction of ptrace and signals.
	 */
	switch (uap->req) {

	case PT_DETACH:
		if (t->p_oppid != t->p_pptr->p_pid) {
			struct proc *pp;

			pp = pfind(t->p_oppid);
			proc_reparent(t, pp ? pp : initproc);
		}

		t->p_oppid = 0;
		CLR(t->p_flag, P_TRACED);
		CLR(t->p_flag, P_SIGEXC);
		goto resume;
		
	case PT_KILL:
		/*
		 *	Tell child process to kill itself after it
		 *	is resumed by adding NSIG to p_cursig. [see issig]
		 */
		psignal_lock(t, SIGKILL, 0);
		goto resume;

	case PT_STEP:			/* single step the child */
	case PT_CONTINUE:		/* continue the child */
		th_act = (thread_act_t)get_firstthread(task);
		if (th_act == THR_ACT_NULL)
			goto errorLabel;
		ut = (uthread_t)get_bsdthread_info(th_act);
		locr0 = ut->uu_ar0;
#if defined(i386)
		state_count = i386_NEW_THREAD_STATE_COUNT;
		if (thread_getstatus(th_act, i386_NEW_THREAD_STATE, &statep, &state_count)  != KERN_SUCCESS) {
			goto errorLabel;
		}	
#elif defined(ppc)
		state_count = PPC_THREAD_STATE64_COUNT;
		if (thread_getstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count)  != KERN_SUCCESS) {
			goto errorLabel;
		}	
#else
#error architecture not supported
#endif
		if ((int)uap->addr != 1) {
#if	defined(i386)
			locr0[PC] = (int)uap->addr;
#elif	defined(ppc)
#define ALIGNED(addr,size)	(((unsigned)(addr)&((size)-1))==0)
		if (!ALIGNED((int)uap->addr, sizeof(int)))
			return (ERESTART);

		statep.srr0 = (uint64_t)((uint32_t)uap->addr);
		state_count = PPC_THREAD_STATE64_COUNT;
		if (thread_setstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count)  != KERN_SUCCESS) {
			goto errorLabel;
		}	
#undef 	ALIGNED
#else
#error architecture not implemented!
#endif
		} /* (int)uap->addr != 1 */

		if ((unsigned)uap->data < 0 || (unsigned)uap->data >= NSIG)
			goto errorLabel;

		if (uap->data != 0) {
			psignal_lock(t, uap->data, 0);
                }
#if defined(ppc)
		state_count = PPC_THREAD_STATE64_COUNT;
		if (thread_getstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count)  != KERN_SUCCESS) {
			goto errorLabel;
		}	
#endif

#define MSR_SE_BIT	21

		if (uap->req == PT_STEP) {
#if	defined(i386)
			locr0[PS] |= PSL_T;
#elif 	defined(ppc)
			statep.srr1 |= MASK(MSR_SE);
#else
#error architecture not implemented!
#endif
		} /* uap->req == PT_STEP */
		else {  /* PT_CONTINUE - clear trace bit if set */
#if defined(i386)
			locr0[PS] &= ~PSL_T;
#elif defined(ppc)
			statep.srr1 &= ~MASK(MSR_SE);
#endif
		}
#if defined (ppc)
		state_count = PPC_THREAD_STATE64_COUNT;
		if (thread_setstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count)  != KERN_SUCCESS) {
			goto errorLabel;
		}	
#endif
	resume:
		t->p_xstat = uap->data;
		t->p_stat = SRUN;
		if (t->sigwait) {
			wakeup((caddr_t)&(t->sigwait));
			if ((t->p_flag & P_SIGEXC) == 0)
				task_release(task);
		}
		break;
		
	case PT_THUPDATE:  {
		thread_act_t target_act;

		if ((unsigned)uap->data >= NSIG)
			goto errorLabel;
		th_act = (thread_act_t)port_name_to_act((void *)uap->addr);
		if (th_act == THR_ACT_NULL)
			return (ESRCH);
		ut = (uthread_t)get_bsdthread_info(th_act);
		if (uap->data)
			ut->uu_siglist |= sigmask(uap->data);
		t->p_xstat = uap->data;
		t->p_stat = SRUN;
		act_deallocate(th_act);
		return(0);
		}
		break;
errorLabel:
	default:
		return(EINVAL);
	}

	return(0);
}
Commit	Line	Data
1c79356b	1	/*
9bccf70c	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	26	/*-
	27	* Copyright (c) 1982, 1986, 1989, 1993
	28	* The Regents of the University of California. All rights reserved.
	29	* (c) UNIX System Laboratories, Inc.
	30	* All or some portions of this file are derived from material licensed
	31	* to the University of California by American Telephone and Telegraph
	32	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	33	* the permission of UNIX System Laboratories, Inc.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. All advertising materials mentioning features or use of this software
	44	* must display the following acknowledgement:
	45	* This product includes software developed by the University of
	46	* California, Berkeley and its contributors.
	47	* 4. Neither the name of the University nor the names of its contributors
	48	* may be used to endorse or promote products derived from this software
	49	* without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	52	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	53	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	54	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	55	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	56	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	57	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	58	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	59	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	60	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	61	* SUCH DAMAGE.
	62	*
	63	* from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
	64	*/
1c79356b A	65
	66	#include <machine/reg.h>
	67	#include <machine/psl.h>
	68
	69	#include <sys/param.h>
	70	#include <sys/systm.h>
	71	#include <sys/proc.h>
	72	#include <sys/errno.h>
	73	#include <sys/ptrace.h>
	74	#include <sys/uio.h>
	75	#include <sys/user.h>
	76	#include <sys/sysctl.h>
0b4e3aa0	77	#include <sys/wait.h>
1c79356b A	78
	79	#include <sys/mount.h>
	80
	81	#include <kern/task.h>
	82	#include <kern/thread.h>
	83	#include <mach/machine/thread_status.h>
	84
	85	/* Macros to clear/set/test flags. */
	86	#define SET(t, f) (t) \|= (f)
	87	#define CLR(t, f) (t) &= ~(f)
	88	#define ISSET(t, f) ((t) & (f))
	89
9bccf70c A	90	void psignal_lock __P((struct proc *, int, int));
	91	int isinferior __P((struct proc , struct proc ));
	92
1c79356b A	93	/*
	94	* sys-trace system call.
	95	*/
	96	struct ptrace_args {
	97	int req;
	98	pid_t pid;
	99	caddr_t addr;
	100	int data;
	101	};
9bccf70c	102
1c79356b A	103	int
	104	ptrace(p, uap, retval)
	105	struct proc *p;
	106	struct ptrace_args *uap;
	107	register_t *retval;
	108	{
	109	struct proc t = current_proc(); / target process */
	110	vm_offset_t start_addr, end_addr,
	111	kern_addr, offset;
	112	vm_size_t size;
1c79356b A	113	task_t task;
	114	thread_t thread;
	115	thread_act_t th_act;
	116	struct uthread *ut;
	117	int *locr0;
	118	int error = 0;
	119	#if defined(ppc)
55e303ae	120	struct ppc_thread_state64 statep;
1c79356b A	121	#elif defined(i386)
	122	struct i386_saved_state statep;
	123	#else
	124	#error architecture not supported
	125	#endif
	126	unsigned long state_count;
9bccf70c	127	int tr_sigexc = 0;
1c79356b A	128
1c79356b A	129
0b4e3aa0 A	130	if (uap->req == PT_DENY_ATTACH) {
	131	if (ISSET(p->p_flag, P_TRACED)) {
	132	exit1(p, W_EXITCODE(ENOTSUP, 0), retval);
9bccf70c	133	/* drop funnel before we return */
0b4e3aa0 A	134	thread_funnel_set(kernel_flock, FALSE);
	135	thread_exception_return();
	136	/* NOTREACHED */
	137	}
	138	SET(p->p_flag, P_NOATTACH);
	139
	140	return(0);
	141	}
	142
9bccf70c A	143	if (uap->req == PT_FORCEQUOTA) {
	144	if (is_suser()) {
	145	SET(t->p_flag, P_FORCEQUOTA);
	146	return (0);
	147	} else
	148	return (EPERM);
	149	}
	150
1c79356b A	151	/*
	152	* Intercept and deal with "please trace me" request.
	153	*/
	154	if (uap->req == PT_TRACE_ME) {
	155	SET(p->p_flag, P_TRACED);
	156	/* Non-attached case, our tracer is our parent. */
	157	t->p_oppid = t->p_pptr->p_pid;
	158	return(0);
	159	}
9bccf70c A	160	if (uap->req == PT_SIGEXC) {
	161	if (ISSET(p->p_flag, P_TRACED)) {
	162	SET(p->p_flag, P_SIGEXC);
	163	return(0);
	164	} else
	165	return(EINVAL);
	166	}
1c79356b A	167
	168	/*
	169	* Locate victim, and make sure it is traceable.
	170	*/
	171	if ((t = pfind(uap->pid)) == NULL)
	172	return (ESRCH);
	173
	174
	175	/* We do not want ptrace to do anything with kernel, init
	176	* and mach_init
	177	*/
	178	if (uap->pid <=2 )
	179	return (EPERM);
	180
	181	task = t->task;
9bccf70c A	182	if (uap->req == PT_ATTACHEXC) {
	183	uap->req = PT_ATTACH;
	184	tr_sigexc = 1;
	185	}
1c79356b A	186	if (uap->req == PT_ATTACH) {
	187
	188	/*
	189	* You can't attach to a process if:
	190	* (1) it's the process that's doing the attaching,
	191	*/
	192	if (t->p_pid == p->p_pid)
	193	return (EINVAL);
	194
	195	/*
	196	* (2) it's already being traced, or
	197	*/
	198	if (ISSET(t->p_flag, P_TRACED))
	199	return (EBUSY);
	200
	201	/*
	202	* (3) it's not owned by you, or is set-id on exec
	203	* (unless you're root).
	204	*/
	205	if ((t->p_cred->p_ruid != p->p_cred->p_ruid \|\|
	206	ISSET(t->p_flag, P_SUGID)) &&
	207	(error = suser(p->p_ucred, &p->p_acflag)) != 0)
	208	return (error);
	209
9bccf70c A	210	if ((p->p_flag & P_TRACED) && isinferior(p, t))
	211	return(EPERM);
	212
0b4e3aa0 A	213	if (ISSET(t->p_flag, P_NOATTACH)) {
	214	psignal(p, SIGSEGV);
	215	return (EBUSY);
	216	}
1c79356b	217	SET(t->p_flag, P_TRACED);
9bccf70c A	218	if (tr_sigexc)
	219	SET(t->p_flag, P_SIGEXC);
	220
1c79356b A	221	t->p_oppid = t->p_pptr->p_pid;
	222	if (t->p_pptr != p)
	223	proc_reparent(t, p);
	224
	225	if (get_task_userstop(task) == 0 ) {
	226	t->p_xstat = 0;
	227	psignal(t, SIGSTOP);
	228	} else {
	229	t->p_xstat = SIGSTOP;
	230	task_resume(task);
	231	}
	232	return(0);
	233	}
	234
	235	/*
	236	* You can't do what you want to the process if:
	237	* (1) It's not being traced at all,
	238	*/
	239	if (!ISSET(t->p_flag, P_TRACED))
	240	return (EPERM);
	241
	242	/*
	243	* (2) it's not being traced by _you_, or
	244	*/
	245	if (t->p_pptr != p)
	246	return (EBUSY);
	247
	248	/*
	249	* (3) it's not currently stopped.
	250	*/
	251	if (t->p_stat != SSTOP)
	252	return (EBUSY);
	253
	254	/*
	255	* Mach version of ptrace executes request directly here,
	256	* thus simplifying the interaction of ptrace and signals.
	257	*/
	258	switch (uap->req) {
	259
	260	case PT_DETACH:
	261	if (t->p_oppid != t->p_pptr->p_pid) {
	262	struct proc *pp;
	263
	264	pp = pfind(t->p_oppid);
	265	proc_reparent(t, pp ? pp : initproc);
	266	}
	267
	268	t->p_oppid = 0;
	269	CLR(t->p_flag, P_TRACED);
9bccf70c	270	CLR(t->p_flag, P_SIGEXC);
1c79356b A	271	goto resume;
	272
	273	case PT_KILL:
	274	/*
	275	* Tell child process to kill itself after it
	276	* is resumed by adding NSIG to p_cursig. [see issig]
	277	*/
9bccf70c	278	psignal_lock(t, SIGKILL, 0);
1c79356b A	279	goto resume;
	280
	281	case PT_STEP: /* single step the child */
	282	case PT_CONTINUE: /* continue the child */
	283	th_act = (thread_act_t)get_firstthread(task);
9bccf70c	284	if (th_act == THR_ACT_NULL)
1c79356b A	285	goto errorLabel;
	286	ut = (uthread_t)get_bsdthread_info(th_act);
	287	locr0 = ut->uu_ar0;
	288	#if defined(i386)
	289	state_count = i386_NEW_THREAD_STATE_COUNT;
9bccf70c	290	if (thread_getstatus(th_act, i386_NEW_THREAD_STATE, &statep, &state_count) != KERN_SUCCESS) {
1c79356b A	291	goto errorLabel;
	292	}
	293	#elif defined(ppc)
55e303ae A	294	state_count = PPC_THREAD_STATE64_COUNT;
55e303ae A	295	if (thread_getstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count) != KERN_SUCCESS) {
1c79356b A	296	goto errorLabel;
	297	}
	298	#else
	299	#error architecture not supported
	300	#endif
	301	if ((int)uap->addr != 1) {
	302	#if defined(i386)
	303	locr0[PC] = (int)uap->addr;
	304	#elif defined(ppc)
	305	#define ALIGNED(addr,size) (((unsigned)(addr)&((size)-1))==0)
	306	if (!ALIGNED((int)uap->addr, sizeof(int)))
	307	return (ERESTART);
	308
55e303ae A	309	statep.srr0 = (uint64_t)((uint32_t)uap->addr);
	310	state_count = PPC_THREAD_STATE64_COUNT;
	311	if (thread_setstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count) != KERN_SUCCESS) {
1c79356b A	312	goto errorLabel;
	313	}
	314	#undef ALIGNED
	315	#else
	316	#error architecture not implemented!
	317	#endif
	318	} /* (int)uap->addr != 1 */
	319
	320	if ((unsigned)uap->data < 0 \|\| (unsigned)uap->data >= NSIG)
	321	goto errorLabel;
	322
	323	if (uap->data != 0) {
9bccf70c	324	psignal_lock(t, uap->data, 0);
1c79356b A	325	}
1c79356b A	326	#if defined(ppc)
55e303ae A	327	state_count = PPC_THREAD_STATE64_COUNT;
55e303ae A	328	if (thread_getstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count) != KERN_SUCCESS) {
1c79356b A	329	goto errorLabel;
	330	}
	331	#endif
	332
	333	#define MSR_SE_BIT 21
	334
	335	if (uap->req == PT_STEP) {
	336	#if defined(i386)
	337	locr0[PS] \|= PSL_T;
	338	#elif defined(ppc)
	339	statep.srr1 \|= MASK(MSR_SE);
	340	#else
	341	#error architecture not implemented!
	342	#endif
	343	} /* uap->req == PT_STEP */
	344	else { /* PT_CONTINUE - clear trace bit if set */
	345	#if defined(i386)
	346	locr0[PS] &= ~PSL_T;
	347	#elif defined(ppc)
	348	statep.srr1 &= ~MASK(MSR_SE);
	349	#endif
	350	}
	351	#if defined (ppc)
55e303ae A	352	state_count = PPC_THREAD_STATE64_COUNT;
55e303ae A	353	if (thread_setstatus(th_act, PPC_THREAD_STATE64, &statep, &state_count) != KERN_SUCCESS) {
1c79356b A	354	goto errorLabel;
	355	}
	356	#endif
	357	resume:
	358	t->p_xstat = uap->data;
	359	t->p_stat = SRUN;
	360	if (t->sigwait) {
	361	wakeup((caddr_t)&(t->sigwait));
55e303ae A	362	if ((t->p_flag & P_SIGEXC) == 0)
55e303ae A	363	task_release(task);
1c79356b A	364	}
	365	break;
	366
9bccf70c A	367	case PT_THUPDATE: {
	368	thread_act_t target_act;
	369
	370	if ((unsigned)uap->data >= NSIG)
	371	goto errorLabel;
	372	th_act = (thread_act_t)port_name_to_act((void *)uap->addr);
	373	if (th_act == THR_ACT_NULL)
	374	return (ESRCH);
	375	ut = (uthread_t)get_bsdthread_info(th_act);
	376	if (uap->data)
	377	ut->uu_siglist \|= sigmask(uap->data);
	378	t->p_xstat = uap->data;
	379	t->p_stat = SRUN;
	380	act_deallocate(th_act);
	381	return(0);
	382	}
	383	break;
	384	errorLabel:
1c79356b	385	default:
1c79356b A	386	return(EINVAL);
1c79356b A	387	}
9bccf70c	388
1c79356b A	389	return(0);
	390	}
	391