dyld_images.h
dyld_images.h头文件内容
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/*
* Copyright (c) 2006-2010 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#ifndef _DYLD_IMAGES_
#define _DYLD_IMAGES_
#include <stdbool.h>
#include <unistd.h>
#include <mach/mach.h>
#include <uuid/uuid.h>
#if defined(__cplusplus) && (BUILDING_LIBDYLD || BUILDING_DYLD)
#include <atomic>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* Beginning in Mac OS X 10.4, this is how gdb discovers which mach-o images are loaded in a process.
*
* gdb looks for the symbol "_dyld_all_image_infos" in dyld. It contains the fields below.
*
* For a snashot of what images are currently loaded, the infoArray fields contain a pointer
* to an array of all images. If infoArray is NULL, it means it is being modified, come back later.
*
* To be notified of changes, gdb sets a break point on the address pointed to by the notificationn
* field. The function it points to is called by dyld with an array of information about what images
* have been added (dyld_image_adding) or are about to be removed (dyld_image_removing).
*
* The notification is called after infoArray is updated. This means that if gdb attaches to a process
* and infoArray is NULL, gdb can set a break point on notification and let the proccess continue to
* run until the break point. Then gdb can inspect the full infoArray.
*
* The dyldVersion field always points to a C string that contains the dyld version. For instance,
* in dyld-127.3, dyldVersion would contain a pointer to "127.3".
*
* The errorMessage and terminationFlags fields are normally zero. If dyld terminates a process
* (for instance because a required dylib or symbol is missing), then the errorMessage field will
* be set to point to a C string message buffer containing the reason dyld terminate the process.
* The low bit of the terminationFlags will be set if dyld terminated the process before any user
* code ran, in which case there is no need for the crash log to contain the backtrace.
*
* When dyld terminates a process because some required dylib or symbol cannot be bound, in
* addition to the errorMessage field, it now sets the errorKind field and the corresponding
* fields: errorClientOfDylibPath, errorTargetDylibPath, errorSymbol.
*
*/
enum dyld_image_mode { dyld_image_adding=0, dyld_image_removing=1, dyld_image_info_change=2 };
struct dyld_image_info {
const struct mach_header* imageLoadAddress; /* base address image is mapped into */
const char* imageFilePath; /* path dyld used to load the image */
uintptr_t imageFileModDate; /* time_t of image file */
/* if stat().st_mtime of imageFilePath does not match imageFileModDate, */
/* then file has been modified since dyld loaded it */
};
struct dyld_uuid_info {
const struct mach_header* imageLoadAddress; /* base address image is mapped into */
uuid_t imageUUID; /* UUID of image */
};
#define DYLD_AOT_IMAGE_KEY_SIZE 32
struct dyld_aot_image_info {
const struct mach_header* x86LoadAddress;
const struct mach_header* aotLoadAddress;
const uint64_t aotImageSize;
const uint8_t aotImageKey[DYLD_AOT_IMAGE_KEY_SIZE]; // uniquely identifying SHA-256 key for this aot
};
struct dyld_aot_shared_cache_info {
const uintptr_t cacheBaseAddress;
uuid_t cacheUUID;
};
typedef void (*dyld_image_notifier)(enum dyld_image_mode mode, uint32_t infoCount, const struct dyld_image_info info[]);
/* for use in dyld_all_image_infos.errorKind field */
enum { dyld_error_kind_none=0,
dyld_error_kind_dylib_missing=1,
dyld_error_kind_dylib_wrong_arch=2,
dyld_error_kind_dylib_version=3,
dyld_error_kind_symbol_missing=4
};
/* internal limit */
#define DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT 8
struct dyld_all_image_infos {
uint32_t version; /* 1 in Mac OS X 10.4 and 10.5 */
uint32_t infoArrayCount;
#if defined(__cplusplus) && (BUILDING_LIBDYLD || BUILDING_DYLD)
std::atomic<const struct dyld_image_info*> infoArray;
#else
const struct dyld_image_info* infoArray;
#endif
dyld_image_notifier notification;
bool processDetachedFromSharedRegion;
/* the following fields are only in version 2 (Mac OS X 10.6, iPhoneOS 2.0) and later */
bool libSystemInitialized;
const struct mach_header* dyldImageLoadAddress;
/* the following field is only in version 3 (Mac OS X 10.6, iPhoneOS 3.0) and later */
void* jitInfo;
/* the following fields are only in version 5 (Mac OS X 10.6, iPhoneOS 3.0) and later */
const char* dyldVersion;
const char* errorMessage;
uintptr_t terminationFlags;
/* the following field is only in version 6 (Mac OS X 10.6, iPhoneOS 3.1) and later */
void* coreSymbolicationShmPage;
/* the following field is only in version 7 (Mac OS X 10.6, iPhoneOS 3.1) and later */
uintptr_t systemOrderFlag;
/* the following field is only in version 8 (Mac OS X 10.7, iPhoneOS 3.1) and later */
uintptr_t uuidArrayCount;
const struct dyld_uuid_info* uuidArray; /* only images not in dyld shared cache */
/* the following field is only in version 9 (Mac OS X 10.7, iOS 4.0) and later */
struct dyld_all_image_infos* dyldAllImageInfosAddress;
/* the following field is only in version 10 (Mac OS X 10.7, iOS 4.2) and later */
uintptr_t initialImageCount;
/* the following field is only in version 11 (Mac OS X 10.7, iOS 4.2) and later */
uintptr_t errorKind;
const char* errorClientOfDylibPath;
const char* errorTargetDylibPath;
const char* errorSymbol;
/* the following field is only in version 12 (Mac OS X 10.7, iOS 4.3) and later */
uintptr_t sharedCacheSlide;
/* the following field is only in version 13 (Mac OS X 10.9, iOS 7.0) and later */
uint8_t sharedCacheUUID[16];
/* the following field is only in version 15 (macOS 10.12, iOS 10.0) and later */
uintptr_t sharedCacheBaseAddress;
#if defined(__cplusplus) && (BUILDING_LIBDYLD || BUILDING_DYLD)
// We want this to be atomic in libdyld so that we can see updates when we map it shared
std::atomic<uint64_t> infoArrayChangeTimestamp;
#else
uint64_t infoArrayChangeTimestamp;
#endif
const char* dyldPath;
mach_port_t notifyPorts[DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT];
#if __LP64__
uintptr_t reserved[13-(DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT/2)];
#else
uintptr_t reserved[13-DYLD_MAX_PROCESS_INFO_NOTIFY_COUNT];
#endif
/* the following field is only in version 16 (macOS 10.13, iOS 11.0) and later */
uintptr_t compact_dyld_image_info_addr;
size_t compact_dyld_image_info_size;
uint32_t platform; // FIXME: really a dyld_platform_t, but those aren't exposed here.
/* the following field is only in version 17 (macOS 10.16) and later */
uint32_t aotInfoCount;
const struct dyld_aot_image_info* aotInfoArray;
uint64_t aotInfoArrayChangeTimestamp;
uintptr_t aotSharedCacheBaseAddress;
uint8_t aotSharedCacheUUID[16];
};
/*
* Beginning in Mac OS X 10.5, this is how gdb discovers where the shared cache is in a process.
* Images that are in the shared cache have their segments rearranged, so when using imageFilePath
* to load the file from disk, you have to know to adjust addresses based on how their segment
* was rearranged.
*
* gdb looks for the symbol "_dyld_shared_region_ranges" in dyld.
*
* It contains information the count of shared regions used by the process. The count is
* the number of start/length pairs.
*/
struct dyld_shared_cache_ranges {
uintptr_t sharedRegionsCount; /* how many ranges follow */
struct {
uintptr_t start;
uintptr_t length;
} ranges[4]; /* max regions */
};
extern struct dyld_shared_cache_ranges dyld_shared_cache_ranges __attribute__((visibility("hidden")));
#ifdef __cplusplus
}
#endif
#endif /* _DYLD_IMAGES_ */