44 lines
1.1 KiB
NASM
44 lines
1.1 KiB
NASM
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;***
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;ehprolog.asm - defines __EH_prolog
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;
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; Copyright (c) 1994-2001, Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; EH prolog helper function. Sets up the frame for a C++ EH function
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; with unwinds, by creating a link in the __except_list, and by setting
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; up EBP as frame base pointer.
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;
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;Revision History:
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; 10-27-94 LL Module created.
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; 10-27-94 CFW Comments added.
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; 01-11-95 SKS Remove MASM 5.X support
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;
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;*******************************************************************************
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title ehprolog.asm
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.386P
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.model FLAT
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ASSUME FS: FLAT
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PUBLIC __EH_prolog
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_TEXT SEGMENT
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__EH_prolog PROC NEAR
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push -1 ; State index
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push eax ; Push address of handler thunk
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mov eax, DWORD PTR fs:0
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push eax ; List link
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mov eax, DWORD PTR [esp+12] ; Load return address
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mov DWORD PTR fs:0, esp
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mov DWORD PTR [esp+12], ebp ; Save old ebp on the stack
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lea ebp, DWORD PTR [esp+12] ; Set ebp to the base of the frame
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push eax ; Push return addr on top of the stack
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ret 0 ; JMP [eax] would be bad on P6
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__EH_prolog ENDP
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_TEXT ENDS
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END
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