src/dyld_gdb.cpp

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2004-2009 Apple Inc. All rights reserved.
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   5  * @APPLE_LICENSE_HEADER_START@
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   7  * This file contains Original Code and/or Modifications of Original Code
   8  * as defined in and that are subject to the Apple Public Source License
   9  * Version 2.0 (the 'License'). You may not use this file except in
  10  * compliance with the License. Please obtain a copy of the License at
  11  * http://www.opensource.apple.com/apsl/ and read it before using this
  12  * file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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  19  * Please see the License for the specific language governing rights and
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  24
  25 #include <stddef.h>
  26 #include <stdint.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <mach-o/loader.h>
  30
  31 #include <vector>
  32
  33 #include "mach-o/dyld_gdb.h"
  34 #include "mach-o/dyld_images.h"
  35 #include "ImageLoader.h"
  36
  37
  38 static std::vector<dyld_image_info> sImageInfos;
  39
  40 void addImagesToAllImages(uint32_t infoCount, const dyld_image_info info[])
  41 {
  42         // make initial size large enought that we probably won't need to re-alloc it
  43         if ( sImageInfos.size() == 0 )
  44                 sImageInfos.reserve(INITIAL_IMAGE_COUNT);
  45
  46         // set infoArray to NULL to denote it is in-use
  47         dyld_all_image_infos.infoArray = NULL;
  48
  49         // append all new images
  50         for (uint32_t i=0; i < infoCount; ++i)
  51                 sImageInfos.push_back(info[i]);
  52         dyld_all_image_infos.infoArrayCount = sImageInfos.size();
  53
  54         // set infoArray back to base address of vector
  55         dyld_all_image_infos.infoArray = &sImageInfos[0];
  56
  57         // tell gdb that about the new images
  58         dyld_all_image_infos.notification(dyld_image_adding, infoCount, info);
  59 }
  60
  61 void removeImageFromAllImages(const struct mach_header* loadAddress)
  62 {
  63         dyld_image_info goingAway;
  64
  65         // set infoArray to NULL to denote it is in-use
  66         dyld_all_image_infos.infoArray = NULL;
  67
  68         // remove image from infoArray
  69         for (std::vector<dyld_image_info>::iterator it=sImageInfos.begin(); it != sImageInfos.end(); it++) {
  70                 if ( it->imageLoadAddress == loadAddress ) {
  71                         goingAway = *it;
  72                         sImageInfos.erase(it);
  73                         break;
  74                 }
  75         }
  76         dyld_all_image_infos.infoArrayCount = sImageInfos.size();
  77
  78         // set infoArray back to base address of vector
  79         dyld_all_image_infos.infoArray = &sImageInfos[0];
  80
  81         // tell gdb that about the new images
  82         dyld_all_image_infos.notification(dyld_image_removing, 1, &goingAway);
  83 }
  84
  85
  86 static void gdb_image_notifier(enum dyld_image_mode mode, uint32_t infoCount, const dyld_image_info info[])
  87 {
  88         // do nothing
  89         // gdb sets a break point here to catch notifications
  90         //dyld::log("dyld: gdb_image_notifier(%s, %d, ...)\n", mode ? "dyld_image_removing" : "dyld_image_adding", infoCount);
  91         //for (uint32_t i=0; i < infoCount; ++i)
  92         //      dyld::log("dyld: %d loading at %p %s\n", i, info[i].imageLoadAddress, info[i].imageFilePath);
  93         //for (uint32_t i=0; i < dyld_all_image_infos.infoArrayCount; ++i)
  94         //      dyld::log("dyld: %d loading at %p %s\n", i, dyld_all_image_infos.infoArray[i].imageLoadAddress, dyld_all_image_infos.infoArray[i].imageFilePath);
  95 }
  96
  97 void setAlImageInfosHalt(const char* message, uintptr_t flags)
  98 {
  99         dyld_all_image_infos.errorMessage = message;
 100         dyld_all_image_infos.terminationFlags = flags;
 101 }
 102
 103
 104 extern void* __dso_handle;
 105 #define STR(s) # s
 106 #define XSTR(s) STR(s)
 107
 108 struct dyld_all_image_infos  dyld_all_image_infos __attribute__ ((section ("__DATA,__all_image_info")))
 109                                                         = { 7, 0, NULL, &gdb_image_notifier, false, false, (const mach_header*)&__dso_handle, NULL,
 110                                                                 XSTR(DYLD_VERSION) , NULL, 0, 0 };
 111
 112 struct dyld_shared_cache_ranges dyld_shared_cache_ranges;
 113
 114
 115