- Win32 Thread Information Block
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En computación ,el Win32 Thread Information Block (TIB) es una estructura de datos en los sistemas Win32 espesificamente en la arquitectura x86 que almacena informacion hacerca del thread que se esta ejecutando.El TIB esta indocumentado oficialmente para Windows 9x.La serie Windows NT incluye una estructura NT TIB en winnt.h que lo documenta . Wine incluye declaraciones para extender (una parte especifica del subsistema) TIB
El TIB puede ser usado para obtener buena cantidad de informacion en el proceso sin llamar ninguna API de Win32.Por ejemplo la emulacion de GetLastError() , GetVersion(). A través del puntero en el PEB se puede obtener acceso a la tabla de importacion (IAT) , los argumentos pasados al proceso etc ..
(articulo en ingles.)
In computing, the Win32 Thread Information Block (TIB) is a data structure in Win32 on x86 that stores info about the currently running thread.
The TIB is officially undocumented for Windows 9x. The Windows NT series DDK includes a struct NT_TIB in winnt.h that documents the subsystem independent part. Wine includes declarations for the extended (subsystem-specific part of) TIB. Yet so many Win32 programs use these undocumented fields that they are effectively a part of the API.
The TIB can be used to get a lot of information on the process without calling Win32 API. Examples include emulating GetLastError(), GetVersion(). Through the pointer to the PEB one can obtain access to the import tables (IAT), process startup arguments, image name, etc.
Contents of the TIB
Posición Longitud Version de Windows Descripción FS:[0x00] 4 Win9x and NT Current Structured Exception Handling (SEH) frame FS:[0x04] 4 Win9x y NT Top of stack FS:[0x08] 4 Win9x y NT Current bottom of stack FS:[0x0C] 4 Desconocido - Subsistema TIB? FS:[0x10] 4 NT Fiber data FS:[0x14] 4 Win9x and NT Arbitrary data slot FS:[0x18] 4 Win9x and NT Linear address of TIB ---- End of Subsistema NT parte independiente ---- FS:[0x1C] 4 NT Environment Pointer FS:[0x20] 4 NT ID del Proceso FS:[0x24] 4 NT ID del thread actual FS:[0x28] 4 NT Active RPC Handle FS:[0x2C] 4 Win9x and NT Linear address of the thread-local storage array FS:[0x30] 4 NT Linear address of Process Environment Block (PEB) FS:[0x34] 4 NT El número del último error FS:[0x38] 4 NT Count of owned critical sections FS:[0x3C] 4 NT Address of CSR Client Thread FS:[0x40] 4 NT Win32 Thread Information FS:[0x44] 124 NT, Wine Win32 client information (NT), user32 private data (Wine), 0x60 = LastError (Win95), 0x74 = LastError (WinME) FS:[0xC0] 4 NT Reserved for Wow32 FS:[0xC4] 4 NT Current Locale FS:[0xC8] 4 NT FP Software Status Register FS:[0xCC] 216 NT, Wine Reserved for OS (NT), kernel32 private data (Wine) FS:[0x124] 4 NT Pointer to KTHREAD (ETHREAD) structure FS:[0x1A4] 4 NT Exception code FS:[0x1A8] 18 NT Activation context stack FS:[0x1BC] 24 NT, Wine Spare bytes (NT), ntdll private data (Wine) FS:[0x1D4] 40 NT, Wine Reserved for OS (NT), ntdll private data (Wine) FS:[0x1FC] 1248 NT, Wine GDI TEB Batch (OS), vm86 private data (Wine) FS:[0x6DC] 4 NT GDI Region FS:[0x6E0] 4 NT GDI Pen FS:[0x6E4] 4 NT GDI Brush FS:[0x6E8] 4 NT Real Process ID FS:[0x6EC] 4 NT Real Thread ID FS:[0x6F0] 4 NT GDI cached process handle FS:[0x6F4] 4 NT GDI client process ID (PID) FS:[0x6F8] 4 NT GDI client thread ID (TID) FS:[0x6FC] 4 NT GDI thread locale information FS:[0x700] 20 NT Reserved for user application FS:[0x714] 1248 NT Reserved for GL FS:[0xBF4] 4 NT Last Status Value FS:[0xBF8] 214 NT Reserved for advapi32 FS:[0xE0C] 4 NT Pointer to deallocation stack FS:[0xE10] 256 NT TLS slots, 4 byte per slot FS:[0xF10] 8 NT TLS links (LIST_ENTRY structure) FS:[0xF18] 4 NT VDM FS:[0xF1C] 4 NT Reserved for RPC FS:[0xF28] 4 NT Thread error mode (RtlSetThreadErrorMode) FS maps to a TIB which is embedded in a data block known as the TDB (thread data base). The TIB contains the thread-specific exception handling chain and pointer to the TLS (thread local storage.) The thread local storage is not the same as C local storage.
Accessing the TIB
The TIB can be accessed as an offset of segment register FS.
It is not common to access the TIB fields by an offset from FS:[0], but rather first getting a linear self-referencing pointer to it stored at FS:[0x18]. That pointer can be used with pointer arithmetics or be cast to a struct pointer.
Example in C inlined-assembly for 32-bit x86:
// gcc (AT&T-style inline assembly). void *getTIB() { void *pTib; __asm__("movl %%fs:0x18, %0" : "=r" (pTib) : : ); return pTib; }
// Microsoft C void *getTib() { void *pTib; __asm { mov EAX, FS:[18h] mov [pTib], EAX } return pTib; }
// Using Microsoft's intrinsics instead of inline assembly void *getTib() { void *pTib = ( void * ) __readfsdword( 0x18 ); return pTib; }
Enlaces externos
Plantilla:Windows-stub
Categorías:- Wikipedia:Traducciones en desarrollo en inglés
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