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Assembly Source File | 1989-05-31 | 24.9 KB | 486 lines

Title ReMark.ASM -- Replaces TurboPower DISABLE Version 2.8 Cseg Segment Public Para ;Version 3.1 30-May-1989 - 03:10 Assume cs:Cseg,ds:Cseg Org 0100h Main Proc Far Jmp Start UsageMsg DB 13,' ',9,10 DB 'ReMark replaces DISABLE ver 2.8 by TurboPower Software',13,10,9 DB '======================================================',13,10,9 DB 'ReMark, like DISABLE, allows ReEnabling a DisAbled TSR',13,10,9 DB 'or DisAbling an active TSR while leaving it in memory.',13,10,10,9 DB 'Watch MUST be installed ahead of the TSR to ReMark.',13,10,10,9 DB 'If ShowTSRs displays an "owner" name of "command", you',13,10,9 DB 'MUST use the PSP address for the TSR which is reported',13,10,9 DB 'in the first column of the line for the TSR displayed.',13,10,10,9 DB 'ReMark accepts the following command line syntax:',13,10,10,9,9 DB 'ReMark [TSRname or PSPaddress][/option]',13,10,10,9,'Options:' DB 9,9,9,'/D(eActivate)',13,10,9,9,9,9,9,'/A(ctivate)',13,10,10,9 DB 'If NO "/"option is entered, ReMark will show STATUS.',13,10,10,9 DB 'ReMark with NO VALID TSR/PSP will display this help.' CRLF DB 13,10,"$",8,32,26 ; You can >TYPE ReMark.COM NoWatch DB 9,9,9,' NO' WatchID DB ' TSR WATCHER' ; Watch identifier @ 81h DB ' is installed!$' NoName DB 9,9,9,9,'Cannot find requested TSR=' Command DB 9 DUP('$') ; Command Parameter DB 9 DUP('!'),'$' ; Invalid Extension AlreadyM DB ' Already$' IsActive DB ' is Active$' NoSpaceM DB ", due to WATCH full, can't be" Disabled DB ' DisAbled$' Remarked DB ' ReEnAbled$' ReMflag DB ? ; 0 if Active or 1 if DisAbled ReQflag DB 0 ; 0 for STATUS, 1="A" or -1="D" ParLen DW 0 ; Length of Command Parameter ErrLvl DW 4C00h ; Used on Exit to DOS WatchF DW 0 ; PSP of Watch if found WatchPos DW ? ; Value of WATCH "vpos" @[104h] BufferPos DW ? ; Working position Offset/Value WatchCode equ offset buffer ; Storage for Patch/Restore Code WatchBuf equ WatchCode + 100h ; Watch VectorChange Area Copy WatchVec equ WatchBuf + 400h ; Storage for WATCH "origv" Vecs WatchNew equ WatchVec + 400h ; New Watch VectorChange Buffer MCBbuf equ WatchNew + 400h ; Storage for MCB records Start: xor ax,ax ; Zero mov cx,2048 ; data mov di,WatchCode ; buffer rep stosw ; words mov si,81h ; Get User mov di,offset Command ; Command Ploop: lodsb ; If Byte cmp al,13 ; is End je Pexit ; Then Exit cmp al,"!" ; Else Skip jc Ploop ; Spaces or Below cmp al,"a" ; Insure that jb Pluck ; Alphabetic cmp al,"z" ; Characters ja Pluck ; Become and al,5Fh ; UPPER case Pluck: cmp al,"/" ; If Switch je Parse ; Then Parse stosb ; Else Store jmp short Ploop ; Name or PSP Parse: lodsb ; Get Switch and al,5Fh ; UPPER case cmp al,"A" ; If NOT "A"ctivate jne Pl4aD ; Then Check "D"eActivate inc ReQflag ; Else "A" ReQuest Pl4aD: cmp al,"D" ; If NOT "D"eActivate jne Ploop ; Then Loop Until End dec ReQflag ; Else "D" ReQuest jmp short Ploop ; and Loop Until End Pexit: sub di,offset Command ; If any Command jnz SaveL ; Then Save Length jmp Usage ; Else Give Help SaveL: mov ParLen,di ; Store Length mov ah,52h ; Undocumented int 21h ; Function mov di,es:[bx-2] ; obtains mov es,di ; MCB of DOS inc di ; Config.Sys mov si,MCBbuf ; Initialize Source and xor bx,bx ; Basic Index Pointers MCBlp: add di,es:[3] ; Advance so as to mov es,di ; Point to MCB and inc di ; Next Paragraph mov [si+bx+0],es ; Store MCB mov dx,es:[1] ; Get and Store mov [si+bx+2],dx ; Block Address mov ax,es:[3] ; and Block mov [si+bx+4],ax ; Length call DoFlags ; Copy Watch/Flag TSR add bx,8 ; Advance to Next and cmp byte ptr es:[0],"Z" ; Loop Until Last MCB jne MCBlp push ds ; Restore Extra Segment pop es ; Register to DATA cmp word ptr WatchF,0 ; If Any Watch was Found jnz IfTSR ; Then Check If TSR Found mov dx,offset NoWatch ; Else NO TSR WATCHER mov byte ptr ErrLvl,1 ; Error Level and mov ah,9 ; Warning Message int 21h ; Give Help on Exit jmp short Usage IfTSR: mov ax,-1 ; Scan for FFFFh mov di,si ; in MCB Buffer mov cx,bx ; Record shr cx,1 ; Words repne scasw ; If None jne NoFind ; Then NO TSR mov bx,es:[di-6] ; Else Get PSP mov di,WatchBuf ; Point to Watch Copy mov cx,WatchPos ; Set Counter to shr cx,1 ; Number of Words WatchS: repne scasw ; If NO More Blocks jcxz NoFind ; Then NO TSR Found cmp bx,es:[di] ; Else If NOT PSP jne WatchS ; Then Search On add di,6 ; Else Save Position of mov BufferPos,di ; First TSR ChangeBlock mov ax,es:[di] ; Get Block ID and Set mov ReMflag,ah ; 0 to Dis or 1 to ReEn Able mov ah,9 mov dx,offset CRLF ; Display New Line int 21h mov dx,offset Command ; Display Command int 21h call Toggle ; Set Status mov ah,9 ; Display New int 21h ; Status and mov dx,offset CRLF ; New Line int 21h ; Before Exit jmp short Exit NoFind: mov ah,9 ; Display TSR mov dx,offset NoName ; NOT Found int 21h ; Message and mov byte ptr ErrLvl,2 ; Set Error Level Usage: mov ah,9 ; Display ReMark mov dx,offset UsageMsg ; Usage Message int 21h Exit: mov ax,ErrLvl ; Error Level int 21h ; Exit to DOS Main EndP Toggle Proc mov bp,WatchPos ; Copy Old WATCH "vpos" xor dx,dx ; Zero ChangeCode Index mov si,WatchBuf ; Copy WATCH Blocks mov cx,BufferPos ; from 1st through sub cx,si ; TSR ID WATCH Block mov di,WatchNew ; Into NEW WATCH Buffer add WatchPos,si ; and Set Limit for Loop rep movsb mov al,ReQflag ; If a "/A" or "/D" or al,al ; Parameter ReQuest jnz ReQest ; Then Process ReQuest add al,ReMflag ; Else Report mov dx,offset IsActive ; "is Active" jz RePort ; or mov dx,offset Disabled ; " DisAbled" RePort: jmp ReTurn ; Current Status ReQest: add al,ReMflag ; If Combined Status cmp al,2 ; and ReQuest => 2 jnc ReLoop ; Then Something to Do mov dx,offset AlreadyM ; Else Report "Already" push ax ; Preserving Combined mov ah,9 ; Flags in AL int 21h ; Register pop ax ; Report mov dx,offset Disabled ; "DisAbled" cmp al,1 ; Unless for jne RePort ; Flags = 1 mov dx,offset IsActive ; "is Active" jmp short RePort ReLoop: mov ax,[si] ; Get Block ID cmp ax,-1 ; If New TSR je ReDone ; Or If End cmp si,WatchPos ; of Blocks jnc ReDone ; Then Exit Loop cmp ah,1 ; Else If to be je LoopOk ; ReEnAbled cmp si,WatchVec ; Or If More Room jc LoopOk ; Then Continue mov byte ptr ErrLvl,3 ; Else Set Error Level 3 for mov dx,offset NoSpaceM ; No Space to DisAble and jmp short ReTurn ; Error Exit from Toggle LoopOk: mov cx,8 ; Set Move Counter mov bx,[si+4] ; Get Segment and mov ax,[si+2] ; Offset of Vector cmp byte ptr ReMflag,0 ; If Zero to DisAble je UnLoop ; Then DisAble Vector mov byte ptr [si+1],0 ; Else Flag ReEnAbled sub bp,cx ; Reduce WATCH "vpos" rep movsb ; Copy Vector Block push di ; Preserve Position mov di,WatchCode ; While Storing Code add di,dx ; Contained in Change stosw ; Vector for Segment mov ax,bx ; and Offset Obtained stosw ; from Vector Block add si,2 ; Advance to Code and mov cx,3 ; Copy the Stored Code rep movsw ; into the Watch Code add dx,10 ; Update Code Index pop di ; Restore Position jmp short ReLoop ; Loop Until Vectors Done ReDone: mov cx,WatchBuf ; Restore Watch sub WatchPos,cx ; Position to Offset mov cx,MCBbuf ; If NO More sub cx,di ; Blocks Remain jcxz WatchW ; Then Update WATCH rep movsb ; Else Copy Remaining WatchW: mov es,WatchF ; Update WATCH Next mov es:[104h],bp ; Vector Position "vpos" mov di,220h ; Copy ChangeBlock Area mov cx,200h ; from the New WATCH mov si,WatchNew ; ChangeBlock Table rep movsw push cs ; Restore Extra Segment pop es ; Register to Program mov si,WatchCode ; Point to Code Table add dx,si ; Calculate Limit call ReCodeP ; ReCode TSR Vectors cmp byte ptr ReMflag,0 ; If TSR WAS Active je Code02 ; Then Code 02 Blocks mov dx,offset Remarked ; Else "ReEnAbled" ReTurn: ret UnLoop: mov byte ptr [si+1],1 ; Flag Vector as Active add bp,cx ; Increase WATCH "vpos" rep movsb ; Copy ChangeBlock 01 mov cx,[si-8] ; Recover Vector Number mov ch,2 ; Start ChangeBlock 02 mov es:[di],cx ; with Block ID Vector 02 add di,8 ; and Leave Rest Blank push di ; Preserve Destination, push ax ; Current Offset and push bx ; Segment for TSR Vector xor ch,ch ; Isolate Vector Number mov bx,cx ; Make Index to shl bx,1 ; Double Word shl bx,1 ; Original Vector mov di,WatchVec ; WATCH Table mov ax,es:[di+bx] ; Initialize Offset mov bx,es:[di+bx+2] ; and Segment Words mov di,WatchBuf ; Look for Latest PVloop: add di,8 ; Previous Until cmp di,BufferPos ; If Reach Current jnc PVdone ; Then Done Looking cmp cl,es:[di] ; Else If Wrong Number jne PVloop ; Or If a Vector cmp byte ptr es:[di+1],2 ; 02 ChangeBlock je PVloop ; Then Keep Looking mov ax,es:[di+2] ; Else UpDate Offset mov bx,es:[di+4] ; and Segment Until NO jmp short PVloop ; More Previous Matches PVdone: mov di,WatchCode ; Point to Code for add di,dx ; Vector Number mov es:[di+7],bx ; Set Segment and mov es:[di+5],ax ; Offset for Patch to mov byte ptr es:[di+4],0EAh ; JMP to Previous Vector pop bx ; Restore Segment and pop ax ; Offset for Patch Code mov es:[di+2],bx ; Store Segment and mov es:[di],ax ; Offset for Patch Code add dx,10 ; UpDate Code Index pop di ; Restore Position jmp ReLoop ; Loop Until Done Code02: mov es,WatchF ; Point to WATCH mov di,BufferPos ; ChangeBlock sub di,WatchBuf ; ahead of TSR 02 add di,220h ; ChangeBlock and mov si,WatchCode ; Store Code Before Patch Next02: add di,8 ; If Next Block is cmp byte ptr es:[di+1],2 ; NOT a 02 ChangeBlock jne Exit02 ; Then End Code Storage add si,4 ; Else Set Pointers to add di,2 ; Code Byte Positions mov cx,6 ; Copy six rep movsb ; Code Bytes jmp short Next02 ; Loop Until All Copied Exit02: push cs ; Restore Extra Segment pop es ; Register to Program mov dx,offset Disabled ; Return "DisAbled" jmp ReTurn Toggle EndP BP2PSP Proc push bp ; Preserve push ax ; PSP and push bx ; General push cx ; Working push dx ; Registers mov cx,4 ; Set Shift Register cmp ParLen,cx ; If NOT 4 digit jne B2Pxit ; Then NOT a PSP mov si,offset Command ; Else Point to PSP mov bx,4096 ; Set Divide Register B2Plp: xor dx,dx ; Zero Extension mov ax,bp ; Get PSP Value div bx ; Calculate Digit mov bp,dx ; Store Remainder or al,30h ; If ASCII Digit cmp al,3Ah ; is Decimal jc B2Padj ; Then ASCII is Ok add al,7 ; Else HEX Convert B2Padj: push cx ; Reset Shift mov cx,4 ; Register and shr bx,cl ; Adjust Divisor inc si ; and PSP Position pop cx ; Restore Counter cmp al,ds:[si-1] ; While Digits Match loope B2Plp ; Loop for 4 Digits B2Pxit: pop dx ; Restore pop cx ; General pop bx ; Working pop ax ; Registers pop bp ; and PSP Address ret BP2PSP EndP DoFlags Proc push si ; Preserve push di ; Pointers and push es ; Segment Register sub dx,di ; If a Program jz ChkPgm ; Then Check It xor dx,dx ; Else Zero Flags jmp DFexit ChkPgm: mov es,di ; Look in mov di,65h ; Program mov cx,4 ; for ID of mov si,offset WatchID ; an [F]Mark rep cmpsb ; If NOT [F]Mark jne Watch? ; Then Check Watch jmp DFexit ; Else Can't ReMark Watch?: mov cx,11 ; If "TSR WATCHER" mov di,81h ; Universal ID for mov si,offset WatchID+1 ; Watch is NOT in rep cmpsb ; Program Command Line jne ChkPSP ; Then Check PSP Command mov WatchF,es ; Else Store Address mov di,es:[104h] ; and "vpos" Vector mov WatchPos,di ; Position (Next Offset) mov di,WatchBuf ; Point to Storage Area push ds ; Exchange Data and push es ; Extra Segment pop ds ; Registers and pop es ; Copy WATCH ChangeBlocks mov si,220h ; and WATCH "origv" Vecs mov cx,400h ; Data Words rep movsw ; Into Storage jmp short DFexit ChkPSP: mov bp,es ; If PSP Does NOT Match call BP2PSP ; Command Parameter jne ChkTSR ; Then Check By Name mov dx,-1 ; Else Flag TSR Block jmp short DFexit ChkTSR: push bx ; Preserve Index mov ax,3000h ; If DOS int 21h ; Version pop bx ; Index Restored cmp al,3 ; is < 3 jc DFexit ; Then NO Name push ds ; Else Point to pop es ; Data of mov di,MCBbuf ; MCB Buffer mov cx,bx ; Set Counter to shr cx,1 ; Words in Buffer mov ax,bp ; If TSR PSP is NOT repne scasw ; Found for Env Block jne DFexit ; Then NO Name mov ax,es:[di-4] ; Else Point to mov es,ax ; Environment MCB mov di,es:[3] ; Convert Length in mov cl,4 ; Paragraphs to shl di,cl ; Bytes and inc ax ; Advance to mov es,ax ; Environment mov cx,di ; Set Counter xor di,di ; Scan Environment xor ax,ax ; for Double Null ScanLp: repne scasb ; If 1st Null NOT dec cx ; Followed by 2nd scasb ; Then Continue jcxz DFexit ; Until Environment Ends jne ScanLp ; OR Until Double Null mov al,"." ; Scan for ".EXT" repne scasb ; If NO Extent DOT jcxz DFexit ; Then NO TSR Name mov cx,ParLen ; Else Use Length dec di ; From ".EXT" DOT to sub di,cx ; Find Start of Name mov si,offset Command ; Compare TSR Names NameLp: lodsb ; If Comand and mov ah,es:[di] ; Environment inc di ; Subsequent and ah,5Fh ; UPPER case cmp ah,al ; Bytes Match loope NameLp ; Then Check All jne DFexit ; Else NO Name mov dx,-1 ; Flag Block if Match DFexit: push cs ; Insure Data Segment pop ds ; Register is Restored pop es ; Restore Segment pop di ; Destination and pop si ; Source Pointers mov [si+bx+6],dx ; Set MCB Flags ret DoFlags EndP ReCodeP Proc cli ; Hold Interrupts push di ; Preserve Offset, push es ; Extra Segment push ax ; and General push bx ; Registers push cx ReCode: push dx ; Preserve Limit lodsw ; Get and Set mov di,ax ; Offset and lodsw ; Segment for mov es,ax ; Code Exchange mov bx,es:[di] ; Get Old and lodsw ; New two Bytes xchg ax,bx ; Exchange Source mov ds:[si-2],ax ; Code in Memory mov cx,es:[di+2] ; from Old Code in lodsw ; Destination Memory xchg ax,cx ; Leaving New Code 6 mov ds:[si-2],ax ; Bytes in Registers mov dx,es:[di+4] ; [BX] has new 1 & 2 lodsw ; [CX] has new 3 & 4 xchg ax,dx ; [DX] has new 5 & 6 mov ds:[si-2],ax ; Source has Old Code mov es:[di+4],dx ; Store mov es:[di+2],cx ; New mov es:[di],bx ; Code pop dx cmp si,dx ; Exchange Watch Codes jc ReCode ; Until Reach Limit sti ; Allow Interrupts pop cx ; Restore pop bx ; Working, pop ax ; Segment pop es ; and Offset pop di ; Registers ret ReCodeP EndP align 16 buffer equ $ Cseg EndS End Main The ReMark replacement for DISABLE has been written as an exercise in assembly language programming. The credit for this TSR management system belongs to Kim Kokkonen and the TurboPower Software Company. You are welcome to the code and TurboPower Software to the glory. from Tom Gilbert's Heart & Mind