AllocSLCallback.3w

Langue: en

Version: Jun 2009 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

AllocSLCallback (KERNEL32.@)

SYNOPSIS

DWORD AllocSLCallback
 (
  DWORD finalizer,
  DWORD callback
 )

PARAMS

finalizer [In] Finalizer function.

[In] Callback function.

DESCRIPTION

Allocate a 16->32 callback.

NOTES

Win95 uses some structchains for callbacks. It allocates them in blocks of 100 entries, size 32 bytes each, layout:

blockstart:

        0:      PTR     nextblockstart

       4:      entry   *first;

       8:      WORD    sel ( start points to blockstart)

       A:      WORD    unknown

100xentry:
       00..17:         Code

       18:     PDB     *owning_process;

       1C:     PTR     blockstart.

We ignore this for now. (Just a note for further developers)

FIXME: use this method, so we don't waste selectors...

Following code is then generated by AllocSLCallback. The code is 16 bit, so the 0x66 prefix switches from word->long registers.
       665A            pop     edx

       6668x arg2 x    pushl   <arg2>

       6652            push    edx

       EAx arg1 x      jmpf    <arg1>.

returns the startaddress of this thunk.

Note, that they look very similar to the ones allocates by THUNK_Alloc.

RETURNS

A segmented pointer to the start of the thunk

IMPLEMENTATION

Not defined in a Wine header. The function is either undocumented, or missing from Wine.

Implemented in "dlls/kernel32/thunk.c".

Debug channel "thunk".