projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| a1c7dba1 A |
1 | /* |
| 2 | * Copyright (c) 2014 Apple Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 24 | #include <stdint.h> | |
| 25 | #include <machine/cpu_capabilities.h> | |
| 26 | #include <sys/kdebug.h> | |
| 27 | #include <sys/errno.h> | |
| 28 | ||
| 29 | #define CLASS_MASK 0xff000000 | |
| 30 | #define CLASS_OFFSET 24 | |
| 31 | #define SUBCLASS_MASK 0x00ff0000 | |
| 32 | #define SUBCLASS_OFFSET 16 | |
| 33 | ||
| 34 | #define EXTRACT_CLASS(debugid) ((uint8_t)(((debugid) & CLASS_MASK) >> CLASS_OFFSET)) | |
| 35 | #define EXTRACT_SUBCLASS(debugid) ( (uint8_t) ( ((debugid) & SUBCLASS_MASK) >> SUBCLASS_OFFSET ) ) | |
| 36 | ||
| 37 | extern int __kdebug_trace64(uint32_t code, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4); | |
| 38 | ||
| 39 | int | |
| 40 | kdebug_trace(uint32_t code, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4) | |
| 41 | { | |
| 42 | uint8_t code_class; | |
| 43 | volatile uint32_t *kdebug_enable_address = (volatile uint32_t *)(uintptr_t)(_COMM_PAGE_KDEBUG_ENABLE); | |
| 44 | ||
| 45 | /* | |
| 46 | * This filtering is also done in the kernel, but we also do it here so that errors | |
| 47 | * are returned in all cases, not just when the system call is actually performed. | |
| 48 | */ | |
| 49 | code_class = EXTRACT_CLASS(code); | |
| 50 | switch (code_class) { | |
| 51 | case DBG_TRACE: | |
| 52 | errno = EPERM; | |
| 53 | return -1; | |
| 54 | } | |
| 55 | ||
| 56 | if (*kdebug_enable_address == 0) { | |
| 57 | return 0; | |
| 58 | } | |
| 59 | ||
| 60 | return __kdebug_trace64(code, arg1, arg2, arg3, arg4); | |
| 61 | } |