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28 #include <mach/mach.h>
29 #include <uuid/uuid.h>
31 #if defined(__cplusplus) && (BUILDING_LIBDYLD || BUILDING_DYLD)
42 * Beginning in Mac OS X 10.4, this is how gdb discovers which mach-o images are loaded in a process.
44 * gdb looks for the symbol "_dyld_all_image_infos" in dyld. It contains the fields below.
46 * For a snashot of what images are currently loaded, the infoArray fields contain a pointer
47 * to an array of all images. If infoArray is NULL, it means it is being modified, come back later.
49 * To be notified of changes, gdb sets a break point on the address pointed to by the notificationn
50 * field. The function it points to is called by dyld with an array of information about what images
51 * have been added (dyld_image_adding) or are about to be removed (dyld_image_removing).
53 * The notification is called after infoArray is updated. This means that if gdb attaches to a process
54 * and infoArray is NULL, gdb can set a break point on notification and let the proccess continue to
55 * run until the break point. Then gdb can inspect the full infoArray.
57 * The dyldVersion field always points to a C string that contains the dyld version. For instance,
58 * in dyld-127.3, dyldVersion would contain a pointer to "127.3".
60 * The errorMessage and terminationFlags fields are normally zero. If dyld terminates a process
61 * (for instance because a required dylib or symbol is missing), then the errorMessage field will
62 * be set to point to a C string message buffer containing the reason dyld terminate the process.
63 * The low bit of the terminationFlags will be set if dyld terminated the process before any user
64 * code ran, in which case there is no need for the crash log to contain the backtrace.
66 * When dyld terminates a process because some required dylib or symbol cannot be bound, in
67 * addition to the errorMessage field, it now sets the errorKind field and the corresponding
68 * fields: errorClientOfDylibPath, errorTargetDylibPath, errorSymbol.
72 enum dyld_image_mode
{ dyld_image_adding
=0, dyld_image_removing
=1, dyld_image_info_change
=2 };
74 struct dyld_image_info
{
75 const struct mach_header
* imageLoadAddress
; /* base address image is mapped into */
76 const char* imageFilePath
; /* path dyld used to load the image */
77 uintptr_t imageFileModDate
; /* time_t of image file */
78 /* if stat().st_mtime of imageFilePath does not match imageFileModDate, */
79 /* then file has been modified since dyld loaded it */
82 struct dyld_uuid_info
{
83 const struct mach_header
* imageLoadAddress
; /* base address image is mapped into */
84 uuid_t imageUUID
; /* UUID of image */
87 typedef void (*dyld_image_notifier
)(enum dyld_image_mode mode
, uint32_t infoCount
, const struct dyld_image_info info
[]);
89 /* for use in dyld_all_image_infos.errorKind field */
90 enum { dyld_error_kind_none
=0,
91 dyld_error_kind_dylib_missing
=1,
92 dyld_error_kind_dylib_wrong_arch
=2,
93 dyld_error_kind_dylib_version
=3,
94 dyld_error_kind_symbol_missing
=4
98 #define DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT 8
100 struct dyld_all_image_infos
{
101 uint32_t version
; /* 1 in Mac OS X 10.4 and 10.5 */
102 uint32_t infoArrayCount
;
103 #if defined(__cplusplus) && (BUILDING_LIBDYLD || BUILDING_DYLD)
104 std::atomic
<const struct dyld_image_info
*> infoArray
;
106 const struct dyld_image_info
* infoArray
;
108 dyld_image_notifier notification
;
109 bool processDetachedFromSharedRegion
;
110 /* the following fields are only in version 2 (Mac OS X 10.6, iPhoneOS 2.0) and later */
111 bool libSystemInitialized
;
112 const struct mach_header
* dyldImageLoadAddress
;
113 /* the following field is only in version 3 (Mac OS X 10.6, iPhoneOS 3.0) and later */
115 /* the following fields are only in version 5 (Mac OS X 10.6, iPhoneOS 3.0) and later */
116 const char* dyldVersion
;
117 const char* errorMessage
;
118 uintptr_t terminationFlags
;
119 /* the following field is only in version 6 (Mac OS X 10.6, iPhoneOS 3.1) and later */
120 void* coreSymbolicationShmPage
;
121 /* the following field is only in version 7 (Mac OS X 10.6, iPhoneOS 3.1) and later */
122 uintptr_t systemOrderFlag
;
123 /* the following field is only in version 8 (Mac OS X 10.7, iPhoneOS 3.1) and later */
124 uintptr_t uuidArrayCount
;
125 const struct dyld_uuid_info
* uuidArray
; /* only images not in dyld shared cache */
126 /* the following field is only in version 9 (Mac OS X 10.7, iOS 4.0) and later */
127 struct dyld_all_image_infos
* dyldAllImageInfosAddress
;
128 /* the following field is only in version 10 (Mac OS X 10.7, iOS 4.2) and later */
129 uintptr_t initialImageCount
;
130 /* the following field is only in version 11 (Mac OS X 10.7, iOS 4.2) and later */
132 const char* errorClientOfDylibPath
;
133 const char* errorTargetDylibPath
;
134 const char* errorSymbol
;
135 /* the following field is only in version 12 (Mac OS X 10.7, iOS 4.3) and later */
136 uintptr_t sharedCacheSlide
;
137 /* the following field is only in version 13 (Mac OS X 10.9, iOS 7.0) and later */
138 uint8_t sharedCacheUUID
[16];
139 /* the following field is only in version 15 (macOS 10.12, iOS 10.0) and later */
140 uintptr_t sharedCacheBaseAddress
;
141 #if defined(__cplusplus) && (BUILDING_LIBDYLD || BUILDING_DYLD)
142 // We want this to be atomic in libdyld so that we can see updates when we map it shared
143 std::atomic
<uint64_t> infoArrayChangeTimestamp
;
145 uint64_t infoArrayChangeTimestamp
;
147 const char* dyldPath
;
148 mach_port_t notifyPorts
[DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT
];
150 uintptr_t reserved
[13-(DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT
/2)];
152 uintptr_t reserved
[13-DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT
];
154 /* the following field is only in version 16 (macOS 10.13, iOS 11.0) and later */
155 uintptr_t compact_dyld_image_info_addr
;
156 size_t compact_dyld_image_info_size
;
157 uint32_t platform
; // FIXME: really a dyld_platform_t, but those aren't exposed here.
161 * Beginning in Mac OS X 10.5, this is how gdb discovers where the shared cache is in a process.
162 * Images that are in the shared cache have their segments rearranged, so when using imageFilePath
163 * to load the file from disk, you have to know to adjust addresses based on how their segment
166 * gdb looks for the symbol "_dyld_shared_region_ranges" in dyld.
168 * It contains information the count of shared regions used by the process. The count is
169 * the number of start/length pairs.
171 struct dyld_shared_cache_ranges
{
172 uintptr_t sharedRegionsCount
; /* how many ranges follow */
176 } ranges
[4]; /* max regions */
178 extern struct dyld_shared_cache_ranges dyld_shared_cache_ranges
__attribute__((visibility("hidden")));
186 #endif /* _DYLD_IMAGES_ */