149 lines
3.3 KiB
NASM
149 lines
3.3 KiB
NASM
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title "LdrInitializeThunk"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; ldrthunk.s
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;
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; Abstract:
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;
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; This module implements the thunk for the LdrpInitialize APC routine.
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;
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; Author:
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;
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; Steven R. Wood (stevewo) 27-Apr-1990
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;
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; Environment:
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;
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; Any mode.
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;
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; Revision History:
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;
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;--
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.386p
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.xlist
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include ks386.inc
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include callconv.inc ; calling convention macros
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.list
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EXTRNP _LdrpInitialize,3
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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page , 132
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;++
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;
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; VOID
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; LdrInitializeThunk(
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; IN PVOID NormalContext,
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; IN PVOID SystemArgument1,
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; IN PVOID SystemArgument2
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; )
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;
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; Routine Description:
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;
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; This function computes a pointer to the context record on the stack
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; and jumps to the LdrpInitialize function with that pointer as its
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; parameter.
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;
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; Arguments:
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;
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; NormalContext - User Mode APC context parameter (ignored).
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;
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; SystemArgument1 - User Mode APC system argument 1 (ignored).
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;
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; SystemArgument2 - User Mode APC system argument 2 (ignored).
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;
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; Return Value:
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;
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; None.
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;
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;--
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cPublicProc _LdrInitializeThunk , 4
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NormalContext equ [esp + 4]
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SystemArgument1 equ [esp + 8]
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SystemArgument2 equ [esp + 12]
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Context equ [esp + 16]
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lea eax,Context ; Calculate address of context record
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mov NormalContext,eax ; Pass as first parameter to
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if DEVL
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xor ebp,ebp ; Mark end of frame pointer list
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endif
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IFDEF STD_CALL
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jmp _LdrpInitialize@12 ; LdrpInitialize
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ELSE
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jmp _LdrpInitialize ; LdrpInitialize
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ENDIF
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stdENDP _LdrInitializeThunk
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;++
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;
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; VOID
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; LdrpCallInitRoutine(
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; IN PDLL_INIT_ROUTINE InitRoutine,
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; IN PVOID DllHandle,
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; IN ULONG Reason,
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; IN PCONTEXT Context OPTIONAL
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; )
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;
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; Routine Description:
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;
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; This function calls an x86 DLL init routine. It is robust
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; against DLLs that don't preserve EBX or fail to clean up
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; enough stack.
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;
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; The only register that the DLL init routine cannot trash is ESI.
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;
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; Arguments:
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;
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; InitRoutine - Address of init routine to call
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;
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; DllHandle - Handle of DLL to call
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;
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; Reason - one of the DLL_PROCESS_... or DLL_THREAD... values
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;
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; Context - context pointer or NULL
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;
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; Return Value:
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;
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; FALSE if the init routine fails, TRUE for success.
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;
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;--
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cPublicProc _LdrpCallInitRoutine , 4
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InitRoutine equ [ebp + 8]
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DllHandle equ [ebp + 12]
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Reason equ [ebp + 16]
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Context equ [ebp + 20]
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stdENDP _LdrpCallInitRoutine
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push ebp
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mov ebp, esp
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push esi ; save esi across the call
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push edi ; save edi across the call
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push ebx ; save ebx on the stack across the call
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mov esi,esp ; save the stack pointer in esi across the call
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push Context
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push Reason
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push DllHandle
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call InitRoutine
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mov esp,esi ; restore the stack pointer in case callee forgot to clean up
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pop ebx ; restore ebx
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pop edi ; restore edi
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pop esi ; restore esi
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pop ebp
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stdRET _LdrpCallInitRoutine
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_TEXT ends
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end
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