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Assembly Source File | 1987-04-18 | 43KB | 1,427 lines

page 60,132 .lfcond title "TRACE - Interrupt Tracer" subttl Introduction page code segment para public 'code' assume cs:code,ds:code public selvideo,selprint,print,print_hex,print_word,print_wordb public crlf,print_line,print_seg,print_edit,print_dec,table_print public feed,key,zap_hits,prt_sc extrn prt_base:word,trace_table:byte,trace_curr:word,ict_index:word public pick_ict,do_traces,do_enable,do_fcb,dump_buf,bin_to_bit public dump_rec,dump_before,dump_after,dump_flags,dump_fcb public dump_asciiz,ict_dump,disp_active extrn rec_sizes:word,interp:near extrn old_int_5:dword include b:trace1e.aic prt_flag db 0 ;flag: printer (1) or Screen (2) subttl Support routines - Printer & Screen I/O page ;***************************************** ; ; Select video for subsequent output ; ;***************************************** selvmsg db cr,lf,"TRACE output routed to CRT screen",cr,lf,"$" selvideo proc near mov prt_flag,0 push dx mov dx,offset selvmsg call print_line pop dx ret selvideo endp ;***************************************** ; ; Select printer for subsequent output ; ;***************************************** selpmsg db cr,lf,"TRACE output routed to printer",cr,lf,"$" selpnomsg db cr,lf,"Printer not found",cr,lf,"$" selprint proc near push ax mov ax,prt_base ;do we have a printer? or al,ah jz selprint_no_printer push dx mov dx,offset selpmsg call print_line pop dx mov prt_flag,al ;al is non-zero if we do jmp selprint_exit selprint_no_printer: push dx mov dx,offset selpnomsg call print_line pop dx selprint_exit: pop ax ret selprint endp ;******************************************************** ; ; Output AL to printer or screen, depending on prt_flag. ; ;******************************************************** print proc near push dx push cx push bx push ax ; ----- See if it should go to printer test prt_flag,0ffh ;send it to printer? jnz print1 ;yes print0: ; ; Send char to video via INT 010H ; mov bl,1 mov ah,14 ;"Write TTY" func int 010h clc ;show no I/O error jmp short print9 print1: ;----- Send it to printer mov dx,prt_base ;get printer base I/O address inc dx ;up to status port mov ah,al ;save char in ah xor cx,cx ;init timeout ticker print2: in al,dx ;get status test al,080h ;is printer busy? jnz print5 ;no, proceed to send char ; ; We're not immediately ready. Some printers require more of a wait than ; the simple 64K loop found in CX. So here's a time waster that you may ; want to tailor to your printer. ; mov al,8 ;greatly extend timeout value print3: dec al jnz print3 loop print2 ;wait for whole timeout stc ;set carry for timeout jmp short print9 ;and exit print5: dec dx ;down to data reg mov al,ah ;recover char to be sent out dx,al ;put it on data lines inc dx ;up to control port inc dx mov al,0dh ;set strobe low out dx,al mov al,0ch ;set strobe high again out dx,al clc ;show no error print9: ; ; At this point, CARRY is SET if we were going to the printer and had an ; I/O error. ; jnc print10 ;no error call selvideo ;error, so switch to video pop ax ;recover AL push ax jmp print0 ;go send it to video print10: pop ax pop bx pop cx pop dx ret print endp ;******************************************************** ; ; Output binary AL as 2 hex digits ; ;******************************************************** print_hex proc near push bx push ax mov bl,al ;isolate HO nibble shr bl,1 shr bl,1 shr bl,1 shr bl,1 and bx,0fh mov al,hextab[bx] ;xlit to hex char call print ;print 1st char pop ax push ax mov bl,al ;isolate LO nibble and bx,0fh mov al,hextab[bx] ;xlit to hex char call print ;print 2nd char pop ax pop bx ret print_hex endp hextab db '0123456789ABCDEF' ;******************************************************** ; ; Output binary word AX as 4 hex digits ; ;******************************************************** print_word proc near xchg ah,al ;get HO half to AL call print_hex ;print 1st 2 chars xchg ah,al ;get LO half back to AL call print_hex ;print 2nd 2 chars ret print_word endp ;******************************************************** ; ; Output binary word AX as 4 hex digits, plus a blank ; ;******************************************************** print_wordb proc near push ax call print_word mov al,' ' call print pop ax ret print_wordb endp ;***************************************** ; ; Print CRLF. ; ;***************************************** crlf proc near push ax mov al,0dh call print mov al,0ah call print pop ax ret crlf endp ;***************************************** ; ; Print string at DS:DX, up to "$" character. ; ;***************************************** print_line proc near push si push ax cld ;forward! mov si,dx ;DS:SI = string print_line2: lodsb ;get next byte to print cmp al,'$' ;terminating char? jz print_line9 ;yes, exit call print ;print this char jmp print_line2 ;continue till "$" print_line9: pop ax pop si ret print_line endp ;***************************************** ; ; Print DX (HO), AX (LO) as xxxx:xxxx. ; ;***************************************** print_seg proc near push ax mov ax,dx ;get HO word first call print_word mov al,':' ;show seperator too call print pop ax ;recover LO word call print_word ret print_seg endp ;******************************************************************** ; ; Print a line at [DX], edited. ; ; Line may contain Edit_xxxx escape characters, as defined above. ; ;******************************************************************** print_edit proc near push si push dx push cx push bx push ax mov si,dx ;use DS:SI to read line cld ;forward!!! print_edit2: lodsb ;get next byte of line cmp al,Edit_Byte ;binary byte to expand? jnz print_edit3 ;no lodsb ;yes, get 8-bit value call print_hex ;print it as hex print_edit2b: mov al,'H' ;tack "H" for HEX after it print_edit2c: call print jmp print_edit2 ;go get next char print_edit3: cmp al,Edit_Word ;16-bit binary to expand? jnz print_edit4 ;no lodsw ;yes, get 16-bit word call print_word ;display as hex jmp print_edit2b ;follow with 'H' and continue print_edit4: cmp al,Edit_Call ;call another routine? jnz print_edit5 ;no lodsb ;yes, get AH argument mov bh,al ;save for a nano... lodsw ;get DX argument mov dx,ax lodsw ;get address to call mov cx,ax mov ah,bh ;recover AH argument to use push si ;save our precious SI call cx ;call the routine pop si jmp print_edit2 ;go get next char print_edit5: cmp al,Edit_Dec8 ;8-bit decimal value? jnz print_edit6 ;no lodsb ;yes, get 8-bit byte xor ah,ah ;clear HO byte print_edit5b: call print_dec ;print AX as decimal jmp print_edit2 ;go get next input char print_edit6: cmp al,Edit_Dec16 ;16-bit decimal value? jnz print_edit7 ;no lodsw ;yes, get 16-bit byte jmp print_edit5b ;print it and go get next char print_edit7: cmp al,Edit_End ;end of input string? jnz print_edit2c ;no, assume ASCII char and print it pop ax pop bx pop cx pop dx pop si ret print_edit endp ;************************************************** ; ; Print AX in decimal, suppressing leading zeroes ; ;************************************************** print_dec proc near push dx push cx push bx push ax mov cx,10 ;divisor xor dx,dx div cx ;DL=units, AX = answer mov bh,dl ;save units xor dx,dx div cx ;DL=tens, AX = answer mov bl,dl ;get tens or bx,03030h ;make into 2 ASCII digits mov word ptr dec_buf+3,bx div cl ;AH=hunds, AL = answer mov bh,ah ;save hundreds xor ah,ah div cl ;AH=thous, AL = ten_thousands mov bl,ah ;get thous or bx,03030h ;make into 2 ASCII digits mov word ptr dec_buf+1,bx or al,030h ;make ten-thousands into ASCII digit mov byte ptr dec_buf,al ; ; Now edit out leading zeroes by advancing BX to 1st non-zero ; mov bx,offset dec_buf mov cx,4 ;max # to suppress print_dec2: cmp byte ptr [bx],'0' jnz print_dec5 ;found non-zero, so exit inc bx ;up to next digit loop print_dec2 print_dec5: ; ; All set. Print from [BX] on... ; mov dx,bx call print_line pop ax pop bx pop cx pop dx ret print_dec endp dec_buf db "99999$" ;******************************************************************** ; ; Print one string from a table of possible strings. ; ; On entry: AH holds selector ; DX holds table address ; ; Each table entry is as follows: ; ; db <selector>,"string",<term> ; ; where: ; <selector> is 8-bit byte that is compared with AH. If it ; matches, then this string is printed. ; ; "string" is the string to be printed ; ; <term> is the terminating character, as follows: ; ; 00H : end of this string ; 80H : end of this string, and end of table too ; ; If no <selector> matches AH, then "????" is printed. ; ;******************************************************************** table_print proc near push si push dx push cx push bx push ax mov si,dx ;use DS:SI to read table cld ;forward!!! table_print2: lodsb ;get next selector cmp al,ah ;does it match AH? jnz table_print5 ;no, skip to next one table_print3: ; ; We have found string to print. Output it until a terminator is found. ; lodsb ;get byte of string test al,07fh ;terminator? jz table_print9 ;yes, exit call print ;no, print this char jmp table_print3 table_print5: ; ; Not this selector. Skip over string till terminator, then go peek ; at next selector. ; lodsb ;get byte of string test al,07fh ;terminator? jnz table_print5 ;no, keep skipping ; ; We have terminator at end of skipped string. It may be end of whole table... ; cmp al,080h ;end of table? jnz table_print2 ;no, go check next selector mov dx,offset huh ;yes, print "????" message cause match not found call print_line table_print9: pop ax pop bx pop cx pop dx pop si ret table_print endp huh db "????$" ;********************************************* ; ; Issue extra linefeeds if we're going to the printer. This ; moves the paper up enough to be read. ; ; This should be called before any input, and whenever output is ; generally finished. ; ;********************************************* feed proc near push ax push cx test prt_flag,0ffh ;are we going to the printer? jz feed9 ;no, just exit mov cx,num_feeds ;# linefeeds to do jcxz feed9 ;none, so exit feed2: call crlf loop feed2 feed9: pop cx pop ax ret feed endp subttl Menu Handling page ;********************************************* ; ; Get uppercase keyboard char to AL. AH is clobbered. ; ;********************************************* key proc near mov ah,0 ;use ROM BIOS to read keyboard int 016h cmp al,'a' ;lowercase char? jb key9 ;no cmp al,'z' ja key9 ;likewise no and al,0dfh ;yes, convert to uppercase key9: ret key endp ;********************************************* ; ; Reset all ICT hits to zero, and restart trace buffer ; ;********************************************* zapmsg db cr,lf,"Counters zeroed",cr,lf,"$" zap_hits proc near push si push ax push bx push cx mov cx,number_icts ;Number of ICT's xor si,si ;start with # 0 cli ;no interrupts! zap_hits2: mov bx,ict_index[si] ;[BX] --> ICT mov [bx].ICT_hits,0 add si,2 ;up to next ICT loop zap_hits2 ;till we've done all of them mov trace_curr,offset trace_table sti ;interrupts OK now push dx mov dx,offset zapmsg call print_line pop dx pop cx pop bx pop ax pop si ret zap_hits endp ;********************************************** ; ; Pick ICT's with which to do something. ; ; This is called to select ICT for various operations. ; ; On entry, DX holds address of question (no CRLF's) to be asked. ; ; Returns: CARRY SET if user selected ABORT to cancel the caller's operation ; ; CARRY CLEAR if AL has been set to 8-bit pattern, with each ; bit from 0 to 7 representing an ICT (0-7) that was selected. ; ;********************************************** pick_ict proc near push bx push cx push dx mov byte ptr pick_map,0 ;init to nobody selected pick_ict1: ; ; Put up our selection menu ; call crlf pop dx ;display caller's question push dx call print_line mov dx,offset pick_menu ;put up our menu call print_line ; ; Fill in choices already made, as if he had typed them ; mov cx,number_icts ;# ICT's mov ah,byte ptr pick_map ;AH has bitmap mov al,'0' ;AL holds ASCII '0' - '7' pick_ict1b: test ah,1 ;Is this ICT selected? jz pick_ict1c ;no call print ;yes, show corresponding ASCII char pick_ict1c: inc al ;Bump ASCII char shr ah,1 ;get next bit to test loop pick_ict1b ;till done all 8 call feed ;eject paper on printer pick_ict2: ; ; Get and handle next keypress ; call key cmp al,'0' ;ICT number? jb pick_ict3 ;no cmp al,'7' ja pick_ict3 ;no call print ;yes, echo it ; ; Convert this ASCII char to bitmap bit, and add to our map ; call bin_to_bit ;comes back in AL or byte ptr pick_map,al ;add this new bit into pattern jmp pick_ict2 ;go get next keypress pick_ict3: cmp al,'L' ;List ICT's? jnz pick_ict4 ;no call disp_active ;yes, show all active ICT's jmp pick_ict1 ;give our menu again pick_ict4: cmp al,'R' ;Restart? jnz pick_ict5 ;no mov byte ptr pick_map,0 ;yes, clear map jmp pick_ict1 ;give new menu pick_ict5: cmp al,'G' ;Go with choices? jnz pick_ict6 ;no pick_ict5b: mov al,byte ptr pick_map ;yes, get choices as bitmap clc ;tell caller to use it jmp short pick_ict9 ;exit pick_ict6: cmp al,0dh ;Carriage Return? jz pick_ict5b ;yes, same as "Go" cmp al,'A' ;Abort operation? jnz pick_ict7 ;no pick_ict6b: stc ;tell caller to abort jmp short pick_ict9 ;exit pick_ict7: cmp al,1bh ;ESCAPE? jz pick_ict6b ;yes, same as "Abort" ; ------ Unknown choice jmp pick_ict2 ;go get next keypress pick_ict9: pop dx pop cx pop bx ret pick_ict endp pick_menu db 0dh,0ah db "0-7 picks ICT (L)ist ICT's (A)bort (R)estart (G)o with choices" db 0dh,0ah,":$" pick_map db 0 ;bitmap of selected ICT's ;********************************************* ; ; Handle "Traces" main menu option ; ;********************************************* do_traces proc near push ax push dx mov dx,offset trace_menu ;put up our menu call print_line call feed ;extra CRLF's for printer call key ;get his selection cmp al,'A' ;dump All? jnz do_traces2 ;no mov al,0ffh ;yes, get bitmap for all ICT's jmp short do_traces7 ;dump 'em do_traces2: cmp al,'S' ;Selected ICT's? jnz do_traces9 ;no, so exit mov dx,offset trace_prompt ;point to question to be used call pick_ict ;get ICT's as bitmap in AL jc do_traces9 ;user wants to forget about it do_traces7: ; ; Do dump, with AL holding bitmap of ICT's that are to be included ; call dump_buf ;with AL already set do_traces9: pop dx pop ax ret do_traces endp trace_menu db 0dh,0ah db "Display (A)ll or (S)elected ICTs' traces:$" trace_prompt db "Pick ICT's whose traces are to be included in dump$" ;********************************************* ; ; Set or Clear F_ENABLE. ; ; On entry, AL holds bit value for F_ENABLE (i.e. - ON or OFF). ; ; This routine asks user for ICT's to be enabled or disabled. ; ;********************************************* do_enable proc near push si push dx push cx push bx push ax ;push him last so we can get to him mov dx,offset enable_prompt ;Assume "Enable" test al,F_ENABLE ;are we enabling? jnz do_enable1 ;yes, we have right message mov dx,offset disable_prompt ;Use "Disable" message do_enable1: call pick_ict ;get ICT's to be affected jc do_enable9 ;user wants to forget it mov byte ptr enable_map,al ;save bitmap of ICT's to be done xor si,si ;start with ICT #0 mov cx,number_icts ;number of ICT's to look at do_enable2: test byte ptr enable_map,1 ;Should this ICT be done? jz do_enable5 ;no mov bx,ict_index[si] ;yes, point to ICT cli ;*** NO INTERRUPTS!!! *** pop ax ;get F_ENABLE value push ax and al,F_ENABLE ;isolate our bit mov ah,[bx].ICT_flags ;get current flags value and ah,F_ENABLE XOR 0ffh ;turn off our bit or ah,al ;set it per caller's desire mov [bx].ICT_flags,ah ;replace it in ICT STI ;*** INTERRUPTS OK NOW *** do_enable5: add si,2 ;up to next ICT shr byte ptr enable_map,1 ;get next ICT's bitmap bit to Bit 0 loop do_enable2 ;till we've looked at all ICT's do_enable9: pop ax pop bx pop cx pop dx pop si ret do_enable endp enable_prompt db "Pick ICT's to have tracing ENABLED$" disable_prompt db "Pick ICT's to have tracing DISABLED$" enable_map db 0 ;bitmap of ICT's to be altered ;********************************************* ; ; Toggle F_FCB in some ICT's. ; ;********************************************* do_fcb proc near push si push dx push cx push bx push ax ;push him last so we can get to him mov dx,offset fcb_toggle call pick_ict ;get ICT's to be affected jc do_fcb9 ;user wants to forget it xor si,si ;start with ICT #0 mov cx,number_icts ;number of ICT's to look at do_fcb2: test al,1 ;Should this ICT be done? jz do_fcb5 ;no mov bx,ict_index[si] ;yes, point to ICT xor [bx].ICT_flags,F_FCB ;toggle current setting do_fcb5: add si,2 ;up to next ICT shr al,1 ;get next ICT's bitmap bit to Bit 0 loop do_fcb2 ;till we've looked at all ICT's do_fcb9: pop ax pop bx pop cx pop dx pop si ret do_fcb endp fcb_toggle db "Pick ICT's to have F_FCB toggled$" subttl Reporting Routines page ;************************************************** ; ; Dump trace buffer for ICT's represented by bitmap in AL. ; ; If bit n in AL is set, then ICT n's trace records are to be included ; in dump. ; ;************************************************** dump_buf proc near push di push si push dx push cx push bx push ax ;push bitmap last so that we can get to it xor di,di ;di is printed line counter mov si,offset trace_table ;start at front of buf dump_buf2: cmp si,trace_curr ;done whole buffer? jae dump_buf9 ;yes, exit ; ; Let a keypress interrupt us ; mov ah,1 ;ROM BIOS "Check for keypress" func int 016h ;keypress present? jnz dump_buf9 ;yes, exit mov al,[si].B_type ;get ICT # call bin_to_bit ;convert to bitmap bit pop bx ;peek at caller's requested bitmap push bx and bl,al ;is this ICT included in caller's bitmap? jz dump_buf5 ;no, skip it ; ; See if it's time for title line ; test di,07h ;every 8 lines jnz dump_buf4 ;not time for title line mov dx,offset dump_title ;print title line call print_line dump_buf4: call dump_rec ;dump this record inc di ;bump # lines printed dump_buf5: ; ; Skip over this record, to next one. To do that, we need to know what ; type of record it is, so that we know how big a record ; we have to skip over. ; mov bl,[si].B_type ;get trace record type and bx,11110000b ;isolate type itself shr bx,1 ;develop type times 2 shr bx,1 shr bx,1 add si,rec_sizes[bx] ;add record size to current pointer jmp dump_buf2 ;continue till buffer exhausted dump_buf9: pop ax pop bx pop cx pop dx pop si pop di ret dump_buf endp dump_title db 0dh,0ah db 0dh,0ah db "INT # AX BX CX DX ES DS SI DI BP SS SP CS:IP" db 0dh,0ah db "--- -- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---------$" ;*********************************************** ; ; Given binary number (0-7) in AL, return bitmap in AL with corresponding ; bit (Bit 0 thru Bit 7) set. ; ; AH is zeroed. ; ;*********************************************** bin_to_bit proc near mov ah,al ;AH is counter, from 7 to 0 mov al,1 ;AL is bitmap, Bit 0 to Bit 7 and ah,7 ;constrain input jz bin_to_bit9 ;binary was 0, so return with Bit 0 set bin_to_bit3: add al,al ;shift bitmap left 1 bit dec ah ;dec count by one jnz bin_to_bit3 bin_to_bit9: ret bin_to_bit endp ;*********************************************** ; ; Dump trace record at [SI]. This routine prints the common ; header information, then calls specific routines to expand ; details. ; ;*********************************************** dump_rec proc near push si push dx push cx push bx push ax call crlf mov al,[si].B_int ;get Interrupt # call print_hex ;show interrupt # mov al,'H' call print mov al,' ' call print mov al,[si].B_type ;get ICT # and al,0fh ;less than 15 call print_hex ;show interrupt number mov al,' ' call print ;print a space mov bl,[si].B_type ;get trace type and bx,11110000b ;isolate type of trace shr bx,1 ;develop type times 2 shr bx,1 shr bx,1 mov bx,word ptr dump_table[bx] call bx ;call proper specific routine pop ax pop bx pop cx pop dx pop si ret dump_rec endp ; ; Table of routines to handle various record types ; dump_table label word dw offset dump_before ;record type 0 = BEFORE dw offset dump_after ;record type 1 = AFTER dw offset dump_fcb ;record type 2 = FCB dw offset dump_asciiz ;record type 3 = ASCIIZ ;*********************************************** ; ; Dump BEFORE record at [SI] ; ;*********************************************** dump_before proc near push si push dx push cx push bx push ax mov al,'B' ;Display "B" for BEFORE call print mov al,' ' ;plus blank after call print mov ax,[si].B_ax call print_wordb mov ax,[si].B_bx call print_wordb mov ax,[si].B_cx call print_wordb mov ax,[si].B_dx call print_wordb mov ax,[si].B_es call print_wordb mov ax,[si].B_ds call print_wordb mov ax,[si].B_si call print_wordb mov ax,[si].B_di call print_wordb mov ax,[si].B_bp call print_wordb mov ax,[si].B_ss call print_wordb mov ax,[si].B_sp call print_wordb mov dx,[si].B_cs mov ax,[si].B_ip call print_seg ; ; Try to interpret this BEFORE record, to make reading easier ; call interp pop ax pop bx pop cx pop dx pop si ret dump_before endp ;*********************************************** ; ; Dump AFTER record at [SI] ; ;*********************************************** dump_after proc near push si push dx push cx push bx push ax mov al,'A' ;Display "A" for AFTER call print mov al,' ' ;plus blank after call print mov ax,[si].A_ax call print_wordb mov ax,[si].A_bx call print_wordb mov ax,[si].A_cx call print_wordb mov ax,[si].A_dx call print_wordb mov ax,[si].A_es call print_wordb mov ax,[si].A_ds call print_wordb mov ax,[si].A_si call print_wordb mov ax,[si].A_di call print_wordb mov ax,[si].A_bp call print_wordb ; ; Now expand flags byte for clarity ; mov dx,[si].A_flags ;hold flags in DX mov si,offset dump_flags ;SI = next flag's name mov bx,0fd5h ;mask of valid bits in flags word mov cx,12 ;# bits to walk through cld ;forward!!! dump_after2: test bx,1 ;is this a valid flag bit? jz dump_after4 ;no, move to next one lodsb ;yes, get next name test dx,1 ;is bit set? jnz dump_after3 ;yes, use name mov al,' ' ;no, use blank dump_after3: call print ;print flag name or space dump_after4: shr dx,1 ;shift flags so next flag is in bit 0 shr bx,1 ;ditto for mask loop dump_after2 ;till done all 12 bits pop ax pop bx pop cx pop dx pop si ret dump_after endp dump_flags db "CPAZSTIDO" ;*********************************************** ; ; Dump FCB record at [SI] ; ;*********************************************** dump_fcb proc near push si push dx push cx push bx push ax mov al,[si].FCB_drive ;display drive # as number mov byte ptr fcb_drv,al mov dx,offset fcb_line ;and put up rest of header call print_edit add si,3 ;skip to filename field mov cx,8 ;max # chars to display cld ;forward!!! dump_fcb2: lodsb ;get byte of filename cmp al,020h ;control char or blank? jbe dump_fcb3b ;yes, we're done with name call print ;no, display char as-is loop dump_fcb2 ;till 8 done or early exit jmp short dump_fcb4 dump_fcb3: ;skip over rest of filename lodsb dump_fcb3b: loop dump_fcb3 dump_fcb4: ;output extension too mov al,'.' ;seperate it with period call print mov cx,3 ;# extension bytes to print dump_fcb5: lodsb ;get byte of extension cmp al,020h ;control char? jb dump_fcb6 ;yes, skip it call print ;no, use as-is dump_fcb6: loop dump_fcb5 pop ax pop bx pop cx pop dx pop si ret dump_fcb endp fcb_line label byte db "FCB Drive:" db Edit_Dec8 fcb_drv db 0 db " Filename: " db Edit_End ;*********************************************** ; ; Dump ASCIIZ record at [SI] ; ;*********************************************** dump_asciiz proc near push si push dx push cx push bx push ax mov dx,offset asciiz_line ;put up header call print_line add si,2 ;skip to start of ASCIIZ text mov cx,size ASCIIZ ;max # chars to display sub cx,2 ;(minus 2 for header) cld ;forward!!! dump_asciiz5: lodsb ;get byte of extension or al,al ;NUL terminator? jz dump_asciiz9 ;yes, exit cmp al,020h ;control char? jb dump_asciiz6 ;yes, skip it call print ;no, use as-is dump_asciiz6: loop dump_asciiz5 dump_asciiz9: pop ax pop bx pop cx pop dx pop si ret dump_asciiz endp asciiz_line label byte db "ASCIIZ: $" ;***************************************** ; ; Display what we know about ICT # AL (0-7). ; ;***************************************** ict_dump proc near push dx push bx push ax and ax,number_icts*2-1 ;edit ICT # mov bx,ax ;get ICT # times 2 shl bx,1 ;divide by 2 mov bx,ict_index[bx] ;[BX] --> ICT itself mov byte ptr ict_msgno,al ;insert it into message mov dx,offset ict_msg1 ;"ICT #n at ..." call print_edit mov dx,ds ;display seg:offset of ICT mov ax,bx call print_seg mov dx,offset ict_ena ;show whether enabled or disabled test [bx].ICT_flags,F_ENABLE jnz ict_dump2 ;got right message mov dx,offset ict_dis ;get other message ict_dump2: call print_line ;display "ENABLED" or "DISABLED" mov dx,offset ict_msg2 ;"INT xxH " call print_line mov al,[bx].ICT_intnum ;display interrupt # call print_hex mov dx,offset ict_msg3 ;"AH range ll/hh" call print_line mov al,[bx].ICT_AH_lo ;display AH range lower limit call print_hex mov al,'/' ;add seperator call print mov al,[bx].ICT_AH_hi ;display AH range upper limit call print_hex mov al,'*' ;display '*' if FCB/ASCIIZ set test [bx].ICT_flags,F_FCB jnz ict_dump3 ;it's set mov al,' ' ;not set, so use blank ict_dump3: call print mov dx,offset ict_msg4 ;"Exit: RET/RET2/IRET" call print_line mov al,[bx].ICT_flags ;interpret exit type mov dx,offset ict_exit ;get to first 6-char message test al,F_RET jz ict_dump5 ;not this one call print_line ict_dump5: add dx,6 ;up to next 6-char exit name test al,F_RET2 jz ict_dump6 ;not this one call print_line ict_dump6: add dx,6 ;up to next 6-char exit name test al,F_IRET jz ict_dump7 ;not this one call print_line ict_dump7: mov dx,offset ict_msg4a ;"Hits: " call print_line mov ax,[bx].ICT_hits call print_dec pop ax pop bx pop dx ret ict_msg1 db 0dh,0ah,"ICT# ",edit_dec8 ict_msgno db ?," ",edit_end ict_msg1a db " @ $" ict_msg2 db " INT $" ict_msg3 db "H AH:$" ict_msg4 db " Exit:$" ict_msg4a db "Hits: $" ict_exit db "RET $" ;6-char exit type names db "RET2 $" db "IRET $" ict_ena db " ENABLED $" ict_dis db " DISABLED$" ict_dump endp ;********************************************* ; ; Display all active ICT's ; ;********************************************* disp_active proc near push si push ax push bx push cx mov cx,number_icts ;Number of ICT's xor si,si ;start with # 0 disp_active2: mov bx,ict_index[si] ;[BX] --> ICT test [bx].ICT_flags,F_ACTIVE ;Is this ICT active? jz disp_active5 ;no, skip it mov ax,si ;yes, develop ICT # 0-7 shr ax,1 ;divide by 2 call ict_dump ;display it disp_active5: add si,2 ;up to next ICT loop disp_active2 ;till we've done all of them pop cx pop bx pop ax pop si ret disp_active endp ;***************************************** ; ; call previous PrtSc routine ; ;***************************************** db "prtsc" ;eyecatcher prt_sc proc near push ax push es mov ax,050h ;set ES to 0050:0000 mov es,ax ;(the print-screen control byte) mov byte ptr es:[0],0 ;mark us not busy now pushf call old_int_5 mov byte ptr es:[0],1 ;mark us busy now pop es pop ax ret prt_sc endp code ends end