Screen 0 not modified 0 \\ *** Assembler *** 25may86we 1 2 Dieses File enth„lt den 68000-Assembler fr volksFORTH-83. 3 Der Assembler basiert auf dem von Michael Perry fr F83 entwik- 4 kelten, enth„lt aber einige zus„tzliche Features. 5 Wegen der Heap-Struktur im volksFORTH sind z.B. echte Labels 6 verwendbar. Aus Geschwindigkeitsgrnden enth„lt der Assembler 7 kaum Fehlerberprfung, es empfiehlt sich daher, nach getaner 8 Tat die Code-Worte mit einem Disassembler zu berprfen. 9 10 Screen $11 enth„lt einen Loadscreen, mit dem man der kompletten 11 Assembler auf den Heap laden kann, damit er w„hrend der Kompila- 12 tionszeit zur Verfgung steht, aber keinen Platz im Dictionary 13 verbraucht. Mit CLEAR oder SAVE wird der Assembler entfernt, 14 wenn er nicht mehr ben”tigt wird. 15 Screen 1 not modified 0 \ 68000 Assembler Load Screen 26oct86we 1 2 Onlyforth 3 Vocabulary Assembler Assembler also definitions 4 5 : end-code context 2- @ context ! ; 6 ' swap | Alias *swap 7 8 base @ 4 $11 +thru base ! 9 10 : reg) size push .l 0 *swap FP DI) ; 11 : Next .w IP )+ D7 move D7 reg) D6 move D6 reg) jmp 12 >here next-link @ , next-link ! ; 13 14 2 3 +thru Onlyforth 15 Screen 2 not modified 0 \ Internal Assembler 09sep86we 1 2 Onlyforth 3 4 here 5 $1300 hallot heap dp ! -1 +load 6 dp ! 7 8 9 10 11 12 13 14 15 Screen 3 not modified 0 \ Extended adressing modes 09sep86we 1 2 : R#) ( addr -- ) size push 3 [ Forth ] dup 0< IF [ Assembler ] .w # D6 move D6 reg) 4 [ Forth ] exit THEN .w FP D) ; 5 6 7 | : inrange? ( addr -- offset f ) [ Forth ] 8 >here 2+ - >here 0< IF dup $FFFE >here - < exit THEN 9 dup >here negate > ; 10 : pcrel) ( addr -- ) \ pc-relativ adressing mode 11 inrange? [ Forth ] 0= abort" out of range" pcd) ; 12 13 : ;c: 0 recover R#) jsr end-code ] ; 14 15 Screen 4 not modified 0 \ Assembler Forth words 09sep86we 1 Forth definitions 2 : Assembler Assembler [ Assembler ] .w ; 3 : Code Create here dup 2- ! Assembler ; 4 5 | : (;code r> last @ name> ! ; 6 : ;Code 0 ?pairs compile (;code [compile] [ reveal 7 Assembler ; immediate restrict 8 9 : >label ( addr -- ) here | Create swap , immediate 10 4 hallot >here 4- heap 4 cmove 11 heap last @ count $1F and + even ! dp ! 12 Does> ( -- addr ) @ 13 state @ IF [compile] Literal THEN ; 14 : Label [ Assembler ] >here [ Forth ] 1 and 15 [ Assembler ] >allot >here >label Assembler ; Screen 5 not modified 0 \ Code generating primitives 26oct86we 1 2 Variable >codes 3 | Create nrc ] c, , c@ here allot ! c! [ 4 5 : nonrelocate nrc >codes ! ; nonrelocate 6 7 | : >exec Create c, 8 Does> c@ >codes @ + @ execute ; 9 10 | 0 >exec >c, | 2 >exec >, | 4 >exec >c@ 11 | 6 >exec >here | 8 >exec >allot | $0A >exec >! 12 | $0C >exec >c! 13 14 15 Screen 6 not modified 0 \ 68000 Meta Assembler 04sep86we 1 2 | : ?, IF >, THEN >, ; 3 | : 2, >, >, ; 4 8 base ! 5 Variable size 6 : .b 10000 size ! ; 7 : .w 30100 size ! ; .w 8 : .l 24600 size ! ; 9 10 | : Sz Constant Does> @ size @ and or ; 11 00300 | Sz sz3 00400 | Sz sz4 12 04000 | Sz sz40 30000 | Sz sz300 13 14 | : long? size @ 24600 = ; 15 | : -sz1 long? IF 100 or THEN ; Screen 7 not modified 0 \ addressing modes 09sep86we 1 2 | : Regs 10 0 DO dup 1001 I * or Constant LOOP drop ; 3 | : Mode Constant Does> @ *swap 7007 and or ; 4 0000 Regs D0 D1 D2 D3 D4 D5 D6 D7 5 0110 Regs A0 A1 A2 A3 A4 A5 A6 A7 6 0220 Mode ) \ address register indirect 7 0330 Mode )+ \ adr reg ind post-increment 8 0440 Mode -) \ adr reg ind pre-decrement 9 0550 Mode D) \ adr reg ind displaced 10 0660 Mode (DI) \ adr reg ind displaced indexed s.u. 11 0770 Constant #) \ immediate address 12 1771 Constant L#) \ immediate long address 13 2772 Constant pcD) \ pc relative displaced 14 3773 Constant (pcDI) \ pc relative displaced indexed 15 4774 Constant # \ immediate data Screen 8 not modified 0 \ fields and register assignments 08sep86we 1 2 | : Field Constant Does> @ and ; 3 7000 | Field rd 0007 | Field rs 4 0070 | Field ms 0077 | Field eas 5 0377 | Field low 6 | : dn? ( ea -- ea flag ) dup ms 0= ; 7 | : src ( ea instr -- ea instr' ) over eas or ; 8 | : dst ( ea instr -- ea instr' ) *swap rd or ; 9 10 | : ??dn ( mod -- mod ) dn? 0= abort" needs Data-Register" ; 11 | : ??an ( mod -- mod ) dup ms 1 = 12 abort" needs Adress-Register" ; 13 14 A6 Constant SP A5 Constant RP A4 Constant IP 15 A3 Constant FP Screen 9 not modified 0 \ extended addressing 09sep86we 1 : DI) (DI) size @ *swap ; 2 : pcDI) (pcDI) size @ *swap ; 3 4 | : double? ( mode -- flag) dup L#) = *swap 5 # = long? and or ; 6 | : index? ( {n} mode -- {m} mode ) 7 dup >r dup 0770 and A0 (DI) = *swap (pcDI) = or 8 IF size @ >r size ! 9 dup rd 10 * *swap ms IF 100000 or THEN 10 sz40 *swap low or r> size ! 11 THEN r> ; 12 13 | : more? ( ea -- ea flag ) dup ms 0040 > ; 14 | : ,more ( ea -- ) more? 15 IF index? double? ?, ELSE drop THEN ; Screen 10 not modified 0 \ extended addressing extras 09sep86we 1 2 | Create extra here 5 dup allot erase \ temporary storage area 3 4 | : extra? ( {n} mode -- mode ) more? 5 IF >r r@ index? double? extra 1+ *swap 6 IF under ! 2+ ! 2 ELSE ! 1 THEN extra c! r> 7 ELSE 0 extra ! 8 THEN ; 9 10 | : ,extra ( -- ) extra c@ ?dup 11 IF extra 1+ *swap 1 = 12 IF @ >, ELSE dup 2+ @ *swap @ 2, THEN extra 5 erase 13 THEN ; 14 15 Screen 11 not modified 0 \ immediates & address register specific 15jan86we 1 | : Imm Constant Does> @ >r extra? eas r> or 2 sz3 >, long? ?, ,extra ; ( n ea) 3 0000 Imm ori 1000 Imm andi 4 2000 Imm subi 3000 Imm addi 5 5000 Imm eori 6000 Imm cmpi 6 | : Immsr Constant Does> @ sz3 2, ; ( n ) 7 001074 Immsr andi>sr 8 005074 Immsr eori>sr 9 000074 Immsr ori>sr 10 | : Iq Constant Does> @ >r extra? eas *swap rs 1000 * or 11 r> or sz3 >, ,extra ; ( n ea ) 12 050000 Iq addq 050400 Iq subq 13 | : Ieaa Constant Does> @ dst src sz4 >, ,more ; ( ea an ) 14 150300 Ieaa adda 130300 Ieaa cmpa 15 040700 Ieaa lea 110300 Ieaa suba Screen 12 not modified 0 \ shifts, rotates, and bit manipulation 15jan86we 1 | : Isr Constant Does> @ >r dn? 2 IF *swap dn? IF r> 40 or >r ELSE drop *swap 1000 * THEN 3 rd *swap rs or r> or 160000 or sz3 >, 4 ELSE dup eas 300 or r@ 400 and or r> 70 and 100 * or 5 160000 or >, ,more 6 THEN ; ( dm dn ) ( m # dn ) ( ea ) 7 400 Isr asl 000 Isr asr 8 410 Isr lsl 010 Isr lsr 9 420 Isr roxl 020 Isr roxr 10 430 Isr rol 030 Isr ror 11 | : Ibit Constant does> @ >r extra? dn? 12 IF rd src 400 ELSE drop dup eas 4000 THEN 13 or r> or >, ,extra ,more ; ( ea dn ) ( ea n # ) 14 000 Ibit btst 100 Ibit bchg 15 200 Ibit bclr 300 Ibit bset Screen 13 not modified 0 \ branch, loop, and set conditionals 15jan86we 1 2 | : Setclass ' *swap 0 DO I over execute LOOP drop ; 3 | : Ibra 400 * 060000 or Constant ( label ) 4 Does> @ *swap >here 2+ - dup abs 200 < 5 IF low or >, ELSE *swap 2, THEN ; 6 20 Setclass Ibra bra bsr bhi bls bcc bcs bne beq 7 bvc bvs bpl bmi bge blt bgt ble 8 | : Idbr 400 * 050310 or Constant ( label \ dn - ) 9 Does> @ *swap rs or >, >here - >, ; 10 20 Setclass Idbr dxit dbra dbhi dbls dbcc dbcs dbne dbeq 11 dbvc dbvs dbpl dbmi dbge dblt dbgt dble 12 | : Iset 400 * 050300 or Constant ( ea ) 13 Does> @ src >, ,more ; 14 20 Setclass Iset set sno shi sls scc scs sne seq 15 svc svs spl smi sge slt sgt sle Screen 14 not modified 0 \ moves 15jan86we 1 2 : move extra? 7700 and src sz300 >, 3 ,more ,extra ; ( ea ea ) 4 : moveq ??dn rd *swap low or 070000 or >, ; ( n dn ) 5 : move>usp ??an rs 047140 or >, ; ( an ) 6 : move, ; ( an ) 7 : movem> 8 extra? eas 044200 or -sz1 >, >, ,extra ; ( n ea ) 9 : movem< 10 extra? eas 046200 or -sz1 >, >, ,extra ; ( n ea ) 11 : movep dn? IF rd *swap rs or 410 or 12 ELSE rs rot rd or 610 or THEN -sz1 2, ; 13 ( dm d an ) ( d an dm ) 14 : lmove 7700 and *swap eas or 20000 or >, ; 15 ( long reg move ) Screen 15 not modified 0 \ odds and ends 15jan86we 1 2 : cmpm rd *swap rs or 130410 or sz3 >, ; ( an@+ am@+ ) 3 : exg dn? IF *swap dn? IF 140500 ELSE 140610 THEN >r 4 ELSE *swap dn? IF 140610 ELSE 140510 THEN >r *swap 5 THEN rs dst r> or >, ; ( rn rm ) 6 : ext ??dn rs 044200 or -sz1 >, ; ( dn ) 7 : swap ??dn rs 044100 or >, ; ( dn ) 8 : stop 47162 2, ; ( n ) 9 : trap 17 and 47100 or >, ; ( n ) 10 : link ??an rs 047120 or 2, ; ( n an ) 11 : unlk ??an rs 047130 or >, ; ( an ) 12 : eor extra? eas dst sz3 130400 or >, ,extra ; ( dn ea ) 13 : cmp ??dn 130000 dst src sz3 >, ,more ; ( ea dn ) 14 15 Screen 16 not modified 0 \ arithmetic and logic 15jan86we 1 | : Ibcd Constant Does> @ dst over rs or *swap ms 2 IF 10 or THEN >, ; ( dn dm ) ( an@- am@- ) 3 140400 Ibcd abcd 100400 Ibcd sbcd 4 | : Idd Constant Does> @ dst over rs or *swap ms 5 IF 10 or THEN sz3 >, ; ( dn dm ) ( an@- am@- ) 6 150400 Idd addx 110400 Idd subx 7 | : Idea Constant Does> @ >r dn? ( ea dn ) ( dn ea ) 8 IF rd src r> or sz3 >, ,more 9 ELSE extra? eas dst 400 or r> or sz3 >, ,extra THEN ; 10 150000 Idea add 110000 Idea sub 11 140000 Idea and 100000 Idea or 12 | : Iead Constant Does> @ >r ??dn r> dst src 13 >, ,more ; ( ea dn) 14 040600 Iead chk 100300 Iead divu 100700 Iead divs 15 140300 Iead mulu 140700 Iead muls Screen 17 not modified 0 \ arithmetic and control 15jan86we 1 2 | : Iea Constant Does> @ src >, ,more ; ( ea ) 3 047200 Iea jsr 047300 Iea jmp 4 042300 Iea move>ccr 5 040300 Iea movesr 6 044000 Iea nbcd 044100 Iea pea 7 045300 Iea tas 8 | : Ieas Constant Does> @ src sz3 >, ,more ; ( ea ) 9 041000 Ieas clr 043000 Ieas not 10 042000 Ieas neg 040000 Ieas negx 11 045000 Ieas tst 12 | : Icon Constant Does> @ >, ; 13 47160 Icon reset 47161 Icon nop 14 47163 Icon rte 47165 Icon rts 15 47166 Icon trapv 47167 Icon rtr Screen 18 not modified 0 \ structured conditionals +/- 256 bytes 15jan86we 1 : THEN >here over 2+ - *swap 1+ >c! ; 2 : IF >, >here 2- ; hex 3 : ELSE 6000 IF *swap THEN ; 4 : BEGIN >here ; 5 : UNTIL >, >here - >here 1- >c! ; 6 : AGAIN 6000 UNTIL ; 7 : WHILE IF *swap ; 8 : REPEAT AGAIN THEN ; 9 : DO >here *swap ; 10 : LOOP dbra ; 11 6600 Constant 0= 6700 Constant 0<> 12 6A00 Constant 0< 6B00 Constant 0>= 13 6C00 Constant < 6D00 Constant >= 14 6E00 Constant <= 6F00 Constant > 15 6500 Constant CC 6400 Constant CS