73 lines
1.4 KiB
PHP
73 lines
1.4 KiB
PHP
subttl emstack.asm - Emulator Stack Management Macros
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page
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;***
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;emstack.asm - Emulator Stack Management Area
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;
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; Microsoft Confidential
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; Copyright (c) Microsoft Corporation 1991
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; All Rights Reserved
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;
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;Purpose:
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; Handles emulator stack.
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;
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;Revision History:
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;
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; [] 09/05/91 TP Initial 32-bit version.
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;
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;*******************************************************************************
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;POPSTret: pops the stack and returns. Uses esi.
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POPSTret macro reg
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local stackwrap
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IFB <reg>
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mov esi,EMSEG:[CURstk]
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_popreg equ esi
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ELSE
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_popreg equ reg
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ENDIF
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mov EMSEG:[_popreg].bTag,bTAG_EMPTY
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NextStackElem _popreg,stackwrap
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mov EMSEG:[CURstk],_popreg
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ret
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Wrap&stackwrap:
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mov EMSEG:[CURstk],BEGstk
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ret
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endm
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;NextStackElem: Given pST(0) = [CURstk] in reg, returns pST(1)
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;Requires NextStackWrap macro with same arguments
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NextStackElem macro reg,stackwrap
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cmp reg,INITstk ;JWM
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jae Wrap&stackwrap
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add reg,Reg87Len
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Cont&stackwrap:
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endm
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NextStackWrap macro reg,stackwrap
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Wrap&stackwrap:
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mov reg,BEGstk ;JWM
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jmp Cont&stackwrap
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endm
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;PrevStackElem: Given pST(0) = [CURstk] in reg, returns new pST(0)
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;after a push onto on the stack.
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;Requires PrevStackWrap macro with same arguments
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PrevStackElem macro reg,stackwrap
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cmp reg,BEGstk ;JWM
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jbe Wrap&stackwrap
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sub reg,Reg87Len
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Cont&stackwrap:
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endm
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PrevStackWrap macro reg,stackwrap
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Wrap&stackwrap:
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mov reg,INITstk ;JWM
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jmp Cont&stackwrap
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endm
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