include/mach-o/dyld_process_info.h

   1 /*
   2  * Copyright (c) 2016 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 #ifndef _DYLD_PROCESS_INFO_
  24 #define _DYLD_PROCESS_INFO_
  25
  26 #include <stdbool.h>
  27 #include <unistd.h>
  28 #include <mach/mach.h>
  29 #include <dispatch/dispatch.h>
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 //
  36 // Beginning in iOS 10.0 and Mac OS X 10.12, this is how lldb figures out mach-o binaries are in a process:
  37 //
  38 // When attaching to an existing process, lldb uses _dyld_process_info_create() to get the current list of images
  39 // in a process, then falls into the start up case.
  40 //
  41 // When starting a process, lldb starts the process suspended, finds the "_dyld_debugger_notification" symbol in
  42 // dyld, sets a break point on it, then resumes the process.  Dyld will call _dyld_debugger_notification() with
  43 // a list of images that were just added or removed from the process.  Dyld calls this function before running
  44 // any initializers in the image, so the debugger will have a chance to set break points in the image.
  45 //
  46
  47 enum dyld_notify_mode { dyld_notify_adding=0, dyld_notify_removing=1, dyld_notify_remove_all=2 };
  48
  49 void _dyld_debugger_notification(enum dyld_notify_mode, unsigned long count, uint64_t machHeaders[]);
  50
  51
  52 struct dyld_process_cache_info {
  53     uuid_t      cacheUUID;              // UUID of cache used by process
  54     uint64_t    cacheBaseAddress;       // load address of dyld shared cache
  55     bool        noCache;                // process is running without a dyld cache
  56     bool        privateCache;           // process is using a private copy of its dyld cache
  57 };
  58 typedef struct dyld_process_cache_info dyld_process_cache_info;
  59
  60 enum {
  61     dyld_process_state_not_started              = 0x00,     // process is suspended, dyld has not started running yet
  62     dyld_process_state_dyld_initialized         = 0x10,     // dyld has initialzed itself
  63     dyld_process_state_terminated_before_inits  = 0x20,     // process was terminated due missing library or symbol before it got to main()
  64     dyld_process_state_libSystem_initialized    = 0x30,     // dyld has run libSystem's initializer
  65     dyld_process_state_running_initializers     = 0x40,     // dyld is running other initializers
  66     dyld_process_state_program_running          = 0x50,     // dyld has finished and jumped into main()
  67     dyld_process_state_dyld_terminated          = 0x60      // process was terminated by dyld post-main (e.g. bad lazying binding info)
  68 };
  69
  70 struct dyld_process_state_info {
  71     uint64_t    timestamp;              // mach_absolute_time of last time dyld change to image list
  72     uint32_t    imageCount;             // number of images currently loaded into process
  73     uint32_t    initialImageCount;      // number of images statically loaded into process (before any dlopen() calls)
  74     uint8_t     dyldState;              // one of dyld_process_state_* values
  75 };
  76 typedef struct dyld_process_state_info dyld_process_state_info;
  77
  78
  79 typedef const struct dyld_process_info_base* dyld_process_info;
  80
  81 //
  82 // Generate a dyld_process_info object for specified task.
  83 //
  84 // The timestamp parameter is an optimization to not spend the time to gather all the image information
  85 // if the process image list has not changed since the last call.  If timestamp is zero, this function
  86 // always gathers the full process info.  If timestamp is non-zero, this function will check if the target
  87 // task's image list has changed since that time.  If is has not changed, the function returns NULL and
  88 // kern_return_t is KERN_SUCCESS.  If it has changed, the function gathers the full image info.
  89 // The kernelError parameter can be NULL for clients that don't care why it failed.
  90 //
  91 extern dyld_process_info _dyld_process_info_create(task_t task, uint64_t timestamp, kern_return_t* kernelError);
  92
  93 // retain/release dyld_process_info for specified task
  94 extern void  _dyld_process_info_release(dyld_process_info info);
  95 extern void  _dyld_process_info_retain(dyld_process_info info);
  96
  97 // fill in struct with basic info about dyld in the process
  98 extern void  _dyld_process_info_get_state(dyld_process_info info, dyld_process_state_info* stateInfo);
  99
 100 // fill in struct with info about dyld cache in use by process
 101 extern void  _dyld_process_info_get_cache(dyld_process_info info, dyld_process_cache_info* cacheInfo);
 102
 103 // iterate all images in process
 104 extern void _dyld_process_info_for_each_image(dyld_process_info info, void (^callback)(uint64_t machHeaderAddress, const uuid_t uuid, const char* path));
 105
 106 // iterate all segments in an image
 107 extern void _dyld_process_info_for_each_segment(dyld_process_info info, uint64_t machHeaderAddress, void (^callback)(uint64_t segmentAddress, uint64_t segmentSize, const char* segmentName));
 108
 109
 110
 111
 112 typedef const struct dyld_process_info_notify_base* dyld_process_info_notify;
 113
 114 //
 115 // Request notifications if image list changes in target process.  Each time a load or unload happens in the target taks,
 116 // the notify block will be called in this process.  If the process exits, the notifyExit block will be called.
 117 // If the notifications cannot be set up, this function will return NULL, and the reason in the kernError parameter.
 118 // The kernelError parameter can be NULL for clients that don't care why it failed.
 119 // If you want to stop receiving notifications, call _dyld_process_info_notify_release().
 120 //
 121 extern dyld_process_info_notify _dyld_process_info_notify(task_t task, dispatch_queue_t queue,
 122                                                           void (^notify)(bool unload, uint64_t timestamp, uint64_t machHeader, const uuid_t uuid, const char* path),
 123                                                           void (^notifyExit)(),
 124                                                           kern_return_t* kernelError);
 125 // add block to call right before main() is entered.
 126 // does nothing if process is already in main().
 127 extern void _dyld_process_info_notify_main(dyld_process_info_notify objc, void (^notifyMain)());
 128
 129
 130 // stop notifications and invalid dyld_process_info_notify object
 131 extern void  _dyld_process_info_notify_release(dyld_process_info_notify object);
 132 extern void  _dyld_process_info_notify_retain(dyld_process_info_notify object);
 133
 134
 135 #ifdef __cplusplus
 136 }
 137 #endif
 138
 139 #endif /* _DYLD_PROCESS_INFO_ */