libkern/os/internal.c

   1 /*
   2  * Copyright (c) 2013-2015 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 "trace_internal.h"
  25 #include <mach-o/loader.h>
  26 #include <string.h>
  27
  28 static bool
  29 _os_trace_addr_in_text_segment_32(const void *dso, const void *addr)
  30 {
  31         const struct mach_header *mhp = (const struct mach_header *) dso;
  32         const struct segment_command *sgp = (const struct segment_command *)(const void *)((const char *)mhp + sizeof(struct mach_header));
  33
  34         for (uint32_t i = 0; i < mhp->ncmds; i++) {
  35                 if (sgp->cmd == LC_SEGMENT) {
  36                         if (strncmp(sgp->segname, SEG_TEXT, sizeof(sgp->segname)) == 0) {
  37                                 return (uintptr_t)addr >= (sgp->vmaddr) && (uintptr_t)addr < (sgp->vmaddr + sgp->vmsize);
  38                         }
  39                 }
  40                 sgp = (const struct segment_command *)(const void *)((const char *)sgp + sgp->cmdsize);
  41         }
  42
  43         return false;
  44 }
  45
  46 static bool
  47 _os_trace_addr_in_text_segment_64(const void *dso, const void *addr)
  48 {
  49         const struct mach_header_64 *mhp = (const struct mach_header_64 *) dso;
  50         const struct segment_command_64 *sgp = (const struct segment_command_64 *)(const void *)((const char *)mhp + sizeof(struct mach_header_64));
  51
  52         for (uint32_t i = 0; i < mhp->ncmds; i++) {
  53                 if (sgp->cmd == LC_SEGMENT_64) {
  54                         if (strncmp(sgp->segname, SEG_TEXT, sizeof(sgp->segname)) == 0) {
  55                                 return (uintptr_t)addr >= (sgp->vmaddr) && (uintptr_t)addr < (sgp->vmaddr + sgp->vmsize);
  56                         }
  57                 }
  58                 sgp = (const struct segment_command_64 *)(const void *)((const char *)sgp + sgp->cmdsize);
  59         }
  60
  61         return false;
  62 }
  63
  64 bool
  65 _os_trace_addr_in_text_segment(const void *dso, const void *addr)
  66 {
  67         const struct mach_header *mhp = (const struct mach_header *) dso;
  68         bool retval = false;
  69
  70         switch (mhp->magic) {
  71         case MH_MAGIC:
  72                 retval = _os_trace_addr_in_text_segment_32(dso, addr);
  73                 break;
  74
  75         case MH_MAGIC_64:
  76                 retval = _os_trace_addr_in_text_segment_64(dso, addr);
  77                 break;
  78
  79         default:
  80                 retval = false;
  81                 break;
  82         }
  83
  84         return retval;
  85 }