Contents of The TIB
| Position | Length | Windows Versions | Description |
|---|---|---|---|
| FS: | 4 | Win9x and NT | Current Structured Exception Handling (SEH) frame |
| FS: | 4 | Win9x and NT | Top of stack |
| FS: | 4 | Win9x and NT | Current bottom of stack |
| FS: | 4 | Unknown - TIB Subsystem? | |
| FS: | 4 | NT | Fiber data |
| FS: | 4 | Win9x and NT | Arbitrary data slot |
| FS: | 4 | Win9x and NT | Linear address of TIB |
| ---- End of NT subsystem independent part ---- | |||
| FS: | 4 | NT | Environment Pointer |
| FS: | 4 | NT | Process ID |
| FS: | 4 | NT | Current thread ID |
| FS: | 4 | NT | Active RPC Handle |
| FS: | 4 | Win9x and NT | Linear address of the thread-local storage array |
| FS: | 4 | NT | Linear address of Process Environment Block (PEB) |
| FS: | 4 | NT | Last error number |
| FS: | 4 | NT | Count of owned critical sections |
| FS: | 4 | NT | Address of CSR Client Thread |
| FS: | 4 | NT | Win32 Thread Information |
| FS: | 124 | NT, Wine | Win32 client information (NT), user32 private data (Wine), 0x60 = LastError (Win95), 0x74 = LastError (WinME) |
| FS: | 4 | NT | Reserved for Wow32 |
| FS: | 4 | NT | Current Locale |
| FS: | 4 | NT | FP Software Status Register |
| FS: | 216 | NT, Wine | Reserved for OS (NT), kernel32 private data (Wine) |
| FS: | 4 | NT | Pointer to KTHREAD (ETHREAD) structure |
| FS: | 4 | NT | Exception code |
| FS: | 18 | NT | Activation context stack |
| FS: | 24 | NT, Wine | Spare bytes (NT), ntdll private data (Wine) |
| FS: | 40 | NT, Wine | Reserved for OS (NT), ntdll private data (Wine) |
| FS: | 1248 | NT, Wine | GDI TEB Batch (OS), vm86 private data (Wine) |
| FS: | 4 | NT | GDI Region |
| FS: | 4 | NT | GDI Pen |
| FS: | 4 | NT | GDI Brush |
| FS: | 4 | NT | Real Process ID |
| FS: | 4 | NT | Real Thread ID |
| FS: | 4 | NT | GDI cached process handle |
| FS: | 4 | NT | GDI client process ID (PID) |
| FS: | 4 | NT | GDI client thread ID (TID) |
| FS: | 4 | NT | GDI thread locale information |
| FS: | 20 | NT | Reserved for user application |
| FS: | 1248 | NT | Reserved for GL |
| FS: | 4 | NT | Last Status Value |
| FS: | 532 | NT | Static UNICODE_STRING buffer |
| FS: | 4 | NT | Pointer to deallocation stack |
| FS: | 256 | NT | TLS slots, 4 byte per slot |
| FS: | 8 | NT | TLS links (LIST_ENTRY structure) |
| FS: | 4 | NT | VDM |
| FS: | 4 | NT | Reserved for RPC |
| FS: | 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.
Read more about this topic: Win32 Thread Information Block
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