bsd/dev/chud/chud_bsd_callback.c

   1 /*
   2  * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 #include <stdint.h>
  32 #include <mach/boolean.h>
  33 #include <mach/mach_types.h>
  34
  35 #include <sys/syscall.h>
  36 #include <sys/types.h> /* u_int */
  37 #include <sys/proc.h> /* struct proc */
  38 #include <sys/systm.h> /* struct sysent */
  39 #include <sys/sysproto.h>
  40
  41 #pragma mark **** kern debug ****
  42 typedef void (*chudxnu_kdebug_callback_func_t)(uint32_t debugid, uint32_t arg0, uint32_t arg1, uint32_t arg2, uint32_t arg3, uint32_t arg4);
  43 static chudxnu_kdebug_callback_func_t kdebug_callback_fn = NULL;
  44
  45 kern_return_t chudxnu_kdebug_callback_enter(chudxnu_kdebug_callback_func_t);
  46 kern_return_t chudxnu_kdebug_callback_cancel(void);
  47
  48 extern void kdbg_control_chud(int val, void *fn);
  49 extern unsigned int kdebug_enable;
  50
  51 static void
  52 chudxnu_private_kdebug_callback(
  53         unsigned int debugid,
  54         unsigned int arg0,
  55         unsigned int arg1,
  56         unsigned int arg2,
  57         unsigned int arg3,
  58         unsigned int arg4)
  59 {
  60     chudxnu_kdebug_callback_func_t fn = kdebug_callback_fn;
  61
  62     if(fn) {
  63         (fn)(debugid, arg0, arg1, arg2, arg3, arg4);
  64     }
  65 }
  66
  67 __private_extern__ kern_return_t
  68 chudxnu_kdebug_callback_enter(chudxnu_kdebug_callback_func_t func)
  69 {
  70     kdebug_callback_fn = func;
  71
  72     kdbg_control_chud(TRUE, (void *)chudxnu_private_kdebug_callback);
  73     kdebug_enable |= 0x10;
  74
  75     return KERN_SUCCESS;
  76 }
  77
  78 __private_extern__ kern_return_t
  79 chudxnu_kdebug_callback_cancel(void)
  80 {
  81     kdebug_callback_fn = NULL;
  82     kdbg_control_chud(FALSE, NULL);
  83     kdebug_enable &= ~(0x10);
  84
  85     return KERN_SUCCESS;
  86 }
  87
  88 #pragma mark **** CHUD syscall ****
  89 typedef kern_return_t (*chudxnu_syscall_callback_func_t)(uint32_t code, uint32_t arg0, uint32_t arg1, uint32_t arg2, uint32_t arg3, uint32_t arg4);
  90 static chudxnu_syscall_callback_func_t syscall_callback_fn = NULL;
  91
  92 kern_return_t chudxnu_syscall_callback_enter(chudxnu_syscall_callback_func_t func);
  93 kern_return_t chudxnu_syscall_callback_cancel(void);
  94
  95 int chud(p, uap, retval)
  96      struct proc *p;
  97      struct chud_args *uap;
  98      register_t *retval;
  99 {
 100 #pragma unused (p)
 101
 102     chudxnu_syscall_callback_func_t fn = syscall_callback_fn;
 103
 104         if(!fn) {
 105                 return EINVAL;
 106         }
 107
 108         *retval = fn(uap->code, uap->arg1, uap->arg2, uap->arg3, uap->arg4, uap->arg5);
 109
 110         return 0;
 111 }
 112
 113 __private_extern__
 114 kern_return_t chudxnu_syscall_callback_enter(chudxnu_syscall_callback_func_t func)
 115 {
 116         syscall_callback_fn = func;
 117     return KERN_SUCCESS;
 118 }
 119
 120 __private_extern__
 121 kern_return_t chudxnu_syscall_callback_cancel(void)
 122 {
 123         syscall_callback_fn = NULL;
 124     return KERN_SUCCESS;
 125 }