65 lines
1.9 KiB
Plaintext
65 lines
1.9 KiB
Plaintext
|
README file for sample WINDBG (old stlye) extension simple.dll
|
||
|
|
|
||
|
|
|
||
|
|
This extsnsion dll shows how to write a simple extension and demostrates use of APIs in wdbgexts.h
|
||
|
|
|
||
|
|
|
||
|
|
Mandatory routines which must be implemented and exported for windbg style extensions:
|
||
|
|
VOID
|
||
|
|
WinDbgExtensionDllInit(
|
||
|
|
PWINDBG_EXTENSION_APIS lpExtensionApis,
|
||
|
|
USHORT MajorVersion,
|
||
|
|
USHORT MinorVersion
|
||
|
|
)
|
||
|
|
|
||
|
|
This is called on loading extension dll. Global variables and flags for extension should be initialized in this routine. One
|
||
|
|
of the useful things to initialize is WINDBG_WNTENSION_APIS which has some commonly used APIS for memory reads and I/O.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
LPEXT_API_VERSION
|
||
|
|
ExtensionApiVersion(
|
||
|
|
VOID
|
||
|
|
)
|
||
|
|
This tells debugger about version of the extension dll. The values returned by this will determine how extension of this
|
||
|
|
dll will be called. A common error while writing extensions is mismatched values of version returned be this routine as
|
||
|
|
compared to what version dll was built with.
|
||
|
|
|
||
|
|
This has ApiVersion = { (VER_PRODUCTVERSION_W >> 8),
|
||
|
|
(VER_PRODUCTVERSION_W & 0xff),
|
||
|
|
EXT_API_VERSION_NUMBER64,
|
||
|
|
0 };
|
||
|
|
|
||
|
|
|
||
|
|
VOID
|
||
|
|
CheckVersion(
|
||
|
|
VOID
|
||
|
|
)
|
||
|
|
This is called after the dll is loaded by the debugger. The extension dll can verify here if it was loaded for correct target.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
Extension Calls
|
||
|
|
---------------
|
||
|
|
|
||
|
|
EXT_API_VERSION_NUMBER64 is needed for making 64-bit aware extensions, all addresses for these will then be ULONG64s, for this
|
||
|
|
an extension is defined as:
|
||
|
|
CPPMOD VOID
|
||
|
|
extension(
|
||
|
|
HANDLE hCurrentProcess,
|
||
|
|
HANDLE hCurrentThread,
|
||
|
|
ULONG64 dwCurrentPc,
|
||
|
|
ULONG dwProcessor,
|
||
|
|
PCSTR args
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
Extensions
|
||
|
|
----------
|
||
|
|
|
||
|
|
|
||
|
|
help
|
||
|
|
|
||
|
|
Every extension dll should have one extension called 'help' which shows descriptions for extensions that are present in the dll.
|