osfmk/arm/machine_task.c

   1 /*
   2  * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56
  57 #include <kern/task.h>
  58 #include <kern/thread.h>
  59 #include <arm/misc_protos.h>
  60
  61 extern zone_t ads_zone;
  62
  63 kern_return_t
  64 machine_task_set_state(
  65                 task_t task,
  66                 int flavor,
  67                 thread_state_t state,
  68                 mach_msg_type_number_t state_count)
  69 {
  70         switch (flavor) {
  71         case ARM_DEBUG_STATE:
  72         {
  73                 arm_debug_state_t *tstate = (arm_debug_state_t *) state;
  74
  75                 if (state_count != ARM_DEBUG_STATE_COUNT) {
  76                         return KERN_INVALID_ARGUMENT;
  77                 }
  78
  79                 if (task->task_debug == NULL) {
  80                         task->task_debug = zalloc(ads_zone);
  81                         if (task->task_debug == NULL)
  82                                 return KERN_FAILURE;
  83                 }
  84
  85                 copy_debug_state(tstate, (arm_debug_state_t*) task->task_debug, FALSE);
  86
  87                 return KERN_SUCCESS;
  88         }
  89         case THREAD_STATE_NONE:         /* Using this flavor to clear task_debug */
  90         {
  91                 if (task->task_debug != NULL) {
  92                         zfree(ads_zone, task->task_debug);
  93                         task->task_debug = NULL;
  94
  95                         return KERN_SUCCESS;
  96                 }
  97                 return KERN_FAILURE;
  98         }
  99         default:
 100           {
 101                 return KERN_INVALID_ARGUMENT;
 102           }
 103         }
 104
 105         return KERN_FAILURE;
 106 }
 107
 108 kern_return_t
 109 machine_task_get_state(task_t task,
 110                 int flavor,
 111                 thread_state_t state,
 112                 mach_msg_type_number_t *state_count)
 113 {
 114         switch (flavor) {
 115         case ARM_DEBUG_STATE:
 116         {
 117                 arm_debug_state_t *tstate = (arm_debug_state_t *) state;
 118
 119                 if (*state_count != ARM_DEBUG_STATE_COUNT) {
 120                         return KERN_INVALID_ARGUMENT;
 121                 }
 122
 123                 if (task->task_debug == NULL) {
 124                         bzero(state, sizeof(*tstate));
 125                 } else {
 126                         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 */
 127                 }
 128
 129                 return KERN_SUCCESS;
 130         }
 131         default:
 132           {
 133                 return KERN_INVALID_ARGUMENT;
 134           }
 135
 136         }
 137         return KERN_FAILURE;
 138 }
 139
 140 void
 141 machine_task_terminate(task_t task)
 142 {
 143         if (task) {
 144                 void *task_debug;
 145
 146                 task_debug = task->task_debug;
 147                 if (task_debug != NULL) {
 148                         task->task_debug = NULL;
 149                         zfree(ads_zone, task_debug);
 150                 }
 151         }
 152 }
 153
 154
 155 kern_return_t
 156 machine_thread_inherit_taskwide(
 157                                 thread_t thread,
 158                                 task_t parent_task)
 159 {
 160         if (parent_task->task_debug) {
 161                 int flavor;
 162                 mach_msg_type_number_t count;
 163
 164                 flavor = ARM_DEBUG_STATE;
 165                 count = ARM_DEBUG_STATE_COUNT;
 166
 167                 return machine_thread_set_state(thread, flavor, parent_task->task_debug, count);
 168         }
 169
 170         return KERN_SUCCESS;
 171 }
 172
 173
 174 void
 175 machine_task_init(__unused task_t new_task,
 176                   __unused task_t parent_task,
 177                   __unused boolean_t memory_inherit)
 178 {
 179 }