xnu-4903.241.1.tar.gz

[apple/xnu.git] / osfmk / arm / machine_task.c

/*
 * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * 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,
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/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#include <kern/task.h>
#include <kern/thread.h>
#include <arm/misc_protos.h>

extern zone_t ads_zone;

kern_return_t
machine_task_set_state(
		task_t task, 
		int flavor,
		thread_state_t state, 
		mach_msg_type_number_t state_count)
{
	switch (flavor) {
	case ARM_DEBUG_STATE:
	{
		arm_debug_state_t *tstate = (arm_debug_state_t *) state;
		
		if (state_count != ARM_DEBUG_STATE_COUNT) {
			return KERN_INVALID_ARGUMENT;
		}
		
		if (task->task_debug == NULL) {
			task->task_debug = zalloc(ads_zone);
			if (task->task_debug == NULL)
				return KERN_FAILURE;
		}
		
		copy_debug_state(tstate, (arm_debug_state_t*) task->task_debug, FALSE);
		
		return KERN_SUCCESS;
	}
	case THREAD_STATE_NONE:		/* Using this flavor to clear task_debug */
	{
		if (task->task_debug != NULL) {
			zfree(ads_zone, task->task_debug);
			task->task_debug = NULL;
			
			return KERN_SUCCESS;
		}
		return KERN_FAILURE;
	}
	default:
	  {
		return KERN_INVALID_ARGUMENT;
	  }
	}

	return KERN_FAILURE;
}

kern_return_t 	
machine_task_get_state(task_t task, 
		int flavor, 
		thread_state_t state,
		mach_msg_type_number_t *state_count)
{
	switch (flavor) {
	case ARM_DEBUG_STATE:
	{
		arm_debug_state_t *tstate = (arm_debug_state_t *) state;
		
		if (*state_count != ARM_DEBUG_STATE_COUNT) {
			return KERN_INVALID_ARGUMENT;
		}
		
		if (task->task_debug == NULL) {
			bzero(state, sizeof(*tstate));		
		} else {
			copy_debug_state((arm_debug_state_t*) task->task_debug, tstate, FALSE); /* FALSE OR TRUE doesn't matter since we are ignoring it for arm */
		} 
		
		return KERN_SUCCESS;
	}
	default:
	  {
		return KERN_INVALID_ARGUMENT;
	  }

	}
	return KERN_FAILURE;
}

void
machine_task_terminate(task_t task)
{
	if (task) {
		void *task_debug;

		task_debug = task->task_debug;
		if (task_debug != NULL) {
			task->task_debug = NULL;
			zfree(ads_zone, task_debug);
		}	 
	}
}


kern_return_t
machine_thread_inherit_taskwide(
				thread_t thread,
				task_t parent_task)
{
	if (parent_task->task_debug) {
		int flavor;
		mach_msg_type_number_t count;

		flavor = ARM_DEBUG_STATE;
		count = ARM_DEBUG_STATE_COUNT;

		return machine_thread_set_state(thread, flavor, parent_task->task_debug, count);
	}

	return KERN_SUCCESS;
}


void
machine_task_init(__unused task_t new_task,
		  __unused task_t parent_task,
		  __unused boolean_t memory_inherit) 
{       
}