mirror of
https://github.com/forth-ev/VolksForth.git
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324 lines
20 KiB
Forth
324 lines
20 KiB
Forth
\ *** Block No. 0 Hexblock 0
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\\ *** Assembler *** 25may86we
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Dieses File enth„lt den 68000-Assembler f<EFBFBD>r volksFORTH-83.
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Der Assembler basiert auf dem von Michael Perry f<EFBFBD>r F83 entwik-
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kelten, enth„lt aber einige zus„tzliche Features.
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Wegen der Heap-Struktur im volksFORTH sind z.B. echte Labels
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verwendbar. Aus Geschwindigkeitsgr<EFBFBD>nden enth„lt der Assembler
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kaum Fehler<EFBFBD>berpr<EFBFBD>fung, es empfiehlt sich daher, nach getaner
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Tat die Code-Worte mit einem Disassembler zu <EFBFBD>berpr<EFBFBD>fen.
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Screen $11 enth„lt einen Loadscreen, mit dem man der kompletten
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Assembler auf den Heap laden kann, damit er w„hrend der Kompila-
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tionszeit zur Verf<EFBFBD>gung steht, aber keinen Platz im Dictionary
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verbraucht. Mit CLEAR oder SAVE wird der Assembler entfernt,
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wenn er nicht mehr ben”tigt wird.
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\ *** Block No. 1 Hexblock 1
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\ 68000 Assembler Load Screen 26oct86we
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Onlyforth
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Vocabulary Assembler Assembler also definitions
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: end-code context 2- @ context ! ;
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' swap | Alias *swap
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base @ 4 $11 +thru base !
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: reg) size push .l 0 *swap FP DI) ;
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: Next .w IP )+ D7 move D7 reg) D6 move D6 reg) jmp
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>here next-link @ , next-link ! ;
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2 3 +thru Onlyforth
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\ *** Block No. 2 Hexblock 2
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\ Internal Assembler 09sep86we
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Onlyforth
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here
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$1300 hallot heap dp ! -1 +load
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dp !
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\ *** Block No. 3 Hexblock 3
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\ Extended adressing modes 09sep86we
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: R#) ( addr -- ) size push
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[ Forth ] dup 0< IF [ Assembler ] .w # D6 move D6 reg)
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[ Forth ] exit THEN .w FP D) ;
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| : inrange? ( addr -- offset f ) [ Forth ]
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>here 2+ - >here 0< IF dup $FFFE >here - < exit THEN
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dup >here negate > ;
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: pcrel) ( addr -- ) \ pc-relativ adressing mode
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inrange? [ Forth ] 0= abort" out of range" pcd) ;
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: ;c: 0 recover R#) jsr end-code ] ;
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\ *** Block No. 4 Hexblock 4
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\ Assembler Forth words 09sep86we
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Forth definitions
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: Assembler Assembler [ Assembler ] .w ;
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: Code Create here dup 2- ! Assembler ;
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| : (;code r> last @ name> ! ;
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: ;Code 0 ?pairs compile (;code [compile] [ reveal
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Assembler ; immediate restrict
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: >label ( addr -- ) here | Create swap , immediate
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4 hallot >here 4- heap 4 cmove
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heap last @ count $1F and + even ! dp !
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Does> ( -- addr ) @
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state @ IF [compile] Literal THEN ;
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: Label [ Assembler ] >here [ Forth ] 1 and
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[ Assembler ] >allot >here >label Assembler ;
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\ *** Block No. 5 Hexblock 5
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\ Code generating primitives 26oct86we
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Variable >codes
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| Create nrc ] c, , c@ here allot ! c! [
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: nonrelocate nrc >codes ! ; nonrelocate
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| : >exec Create c,
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Does> c@ >codes @ + @ execute ;
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| 0 >exec >c, | 2 >exec >, | 4 >exec >c@
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| 6 >exec >here | 8 >exec >allot | $0A >exec >!
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| $0C >exec >c!
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\ *** Block No. 6 Hexblock 6
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\ 68000 Meta Assembler 04sep86we
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| : ?, IF >, THEN >, ;
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| : 2, >, >, ;
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8 base !
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Variable size
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: .b 10000 size ! ;
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: .w 30100 size ! ; .w
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: .l 24600 size ! ;
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| : Sz Constant Does> @ size @ and or ;
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00300 | Sz sz3 00400 | Sz sz4
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04000 | Sz sz40 30000 | Sz sz300
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| : long? size @ 24600 = ;
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| : -sz1 long? IF 100 or THEN ;
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\ *** Block No. 7 Hexblock 7
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\ addressing modes 09sep86we
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| : Regs 10 0 DO dup 1001 I * or Constant LOOP drop ;
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| : Mode Constant Does> @ *swap 7007 and or ;
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0000 Regs D0 D1 D2 D3 D4 D5 D6 D7
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0110 Regs A0 A1 A2 A3 A4 A5 A6 A7
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0220 Mode ) \ address register indirect
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0330 Mode )+ \ adr reg ind post-increment
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0440 Mode -) \ adr reg ind pre-decrement
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0550 Mode D) \ adr reg ind displaced
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0660 Mode (DI) \ adr reg ind displaced indexed s.u.
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0770 Constant #) \ immediate address
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1771 Constant L#) \ immediate long address
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2772 Constant pcD) \ pc relative displaced
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3773 Constant (pcDI) \ pc relative displaced indexed
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4774 Constant # \ immediate data
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\ *** Block No. 8 Hexblock 8
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\ fields and register assignments 08sep86we
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| : Field Constant Does> @ and ;
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7000 | Field rd 0007 | Field rs
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0070 | Field ms 0077 | Field eas
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0377 | Field low
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| : dn? ( ea -- ea flag ) dup ms 0= ;
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| : src ( ea instr -- ea instr' ) over eas or ;
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| : dst ( ea instr -- ea instr' ) *swap rd or ;
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| : ??dn ( mod -- mod ) dn? 0= abort" needs Data-Register" ;
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| : ??an ( mod -- mod ) dup ms 1 =
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abort" needs Adress-Register" ;
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A6 Constant SP A5 Constant RP A4 Constant IP
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A3 Constant FP
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\ *** Block No. 9 Hexblock 9
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\ extended addressing 09sep86we
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: DI) (DI) size @ *swap ;
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: pcDI) (pcDI) size @ *swap ;
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| : double? ( mode -- flag) dup L#) = *swap
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# = long? and or ;
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| : index? ( {n} mode -- {m} mode )
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dup >r dup 0770 and A0 (DI) = *swap (pcDI) = or
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IF size @ >r size !
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dup rd 10 * *swap ms IF 100000 or THEN
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sz40 *swap low or r> size !
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THEN r> ;
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| : more? ( ea -- ea flag ) dup ms 0040 > ;
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| : ,more ( ea -- ) more?
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IF index? double? ?, ELSE drop THEN ;
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\ *** Block No. 10 Hexblock A
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\ extended addressing extras 09sep86we
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| Create extra here 5 dup allot erase \ temporary storage area
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| : extra? ( {n} mode -- mode ) more?
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IF >r r@ index? double? extra 1+ *swap
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IF under ! 2+ ! 2 ELSE ! 1 THEN extra c! r>
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ELSE 0 extra !
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THEN ;
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| : ,extra ( -- ) extra c@ ?dup
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IF extra 1+ *swap 1 =
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IF @ >, ELSE dup 2+ @ *swap @ 2, THEN extra 5 erase
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THEN ;
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\ *** Block No. 11 Hexblock B
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\ immediates & address register specific 15jan86we
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| : Imm Constant Does> @ >r extra? eas r> or
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sz3 >, long? ?, ,extra ; ( n ea)
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0000 Imm ori 1000 Imm andi
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2000 Imm subi 3000 Imm addi
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5000 Imm eori 6000 Imm cmpi
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| : Immsr Constant Does> @ sz3 2, ; ( n )
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001074 Immsr andi>sr
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005074 Immsr eori>sr
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000074 Immsr ori>sr
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| : Iq Constant Does> @ >r extra? eas *swap rs 1000 * or
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r> or sz3 >, ,extra ; ( n ea )
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050000 Iq addq 050400 Iq subq
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| : Ieaa Constant Does> @ dst src sz4 >, ,more ; ( ea an )
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150300 Ieaa adda 130300 Ieaa cmpa
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040700 Ieaa lea 110300 Ieaa suba
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\ *** Block No. 12 Hexblock C
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\ shifts, rotates, and bit manipulation 15jan86we
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| : Isr Constant Does> @ >r dn?
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IF *swap dn? IF r> 40 or >r ELSE drop *swap 1000 * THEN
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rd *swap rs or r> or 160000 or sz3 >,
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ELSE dup eas 300 or r@ 400 and or r> 70 and 100 * or
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160000 or >, ,more
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THEN ; ( dm dn ) ( m # dn ) ( ea )
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400 Isr asl 000 Isr asr
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410 Isr lsl 010 Isr lsr
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420 Isr roxl 020 Isr roxr
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430 Isr rol 030 Isr ror
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| : Ibit Constant does> @ >r extra? dn?
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IF rd src 400 ELSE drop dup eas 4000 THEN
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or r> or >, ,extra ,more ; ( ea dn ) ( ea n # )
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000 Ibit btst 100 Ibit bchg
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200 Ibit bclr 300 Ibit bset
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\ *** Block No. 13 Hexblock D
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\ branch, loop, and set conditionals 15jan86we
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| : Setclass ' *swap 0 DO I over execute LOOP drop ;
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| : Ibra 400 * 060000 or Constant ( label )
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Does> @ *swap >here 2+ - dup abs 200 <
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IF low or >, ELSE *swap 2, THEN ;
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20 Setclass Ibra bra bsr bhi bls bcc bcs bne beq
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bvc bvs bpl bmi bge blt bgt ble
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| : Idbr 400 * 050310 or Constant ( label \ dn - )
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Does> @ *swap rs or >, >here - >, ;
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20 Setclass Idbr dxit dbra dbhi dbls dbcc dbcs dbne dbeq
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dbvc dbvs dbpl dbmi dbge dblt dbgt dble
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| : Iset 400 * 050300 or Constant ( ea )
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Does> @ src >, ,more ;
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20 Setclass Iset set sno shi sls scc scs sne seq
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svc svs spl smi sge slt sgt sle
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\ *** Block No. 14 Hexblock E
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\ moves 15jan86we
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: move extra? 7700 and src sz300 >,
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,more ,extra ; ( ea ea )
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: moveq ??dn rd *swap low or 070000 or >, ; ( n dn )
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: move>usp ??an rs 047140 or >, ; ( an )
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: move<usp ??an rs 047150 or >, ; ( an )
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: movem>
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extra? eas 044200 or -sz1 >, >, ,extra ; ( n ea )
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: movem<
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extra? eas 046200 or -sz1 >, >, ,extra ; ( n ea )
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: movep dn? IF rd *swap rs or 410 or
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ELSE rs rot rd or 610 or THEN -sz1 2, ;
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( dm d an ) ( d an dm )
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: lmove 7700 and *swap eas or 20000 or >, ;
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( long reg move )
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\ *** Block No. 15 Hexblock F
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\ odds and ends 15jan86we
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: cmpm rd *swap rs or 130410 or sz3 >, ; ( an@+ am@+ )
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: exg dn? IF *swap dn? IF 140500 ELSE 140610 THEN >r
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ELSE *swap dn? IF 140610 ELSE 140510 THEN >r *swap
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THEN rs dst r> or >, ; ( rn rm )
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: ext ??dn rs 044200 or -sz1 >, ; ( dn )
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: swap ??dn rs 044100 or >, ; ( dn )
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: stop 47162 2, ; ( n )
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: trap 17 and 47100 or >, ; ( n )
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: link ??an rs 047120 or 2, ; ( n an )
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: unlk ??an rs 047130 or >, ; ( an )
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: eor extra? eas dst sz3 130400 or >, ,extra ; ( dn ea )
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: cmp ??dn 130000 dst src sz3 >, ,more ; ( ea dn )
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\ *** Block No. 16 Hexblock 10
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\ arithmetic and logic 15jan86we
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| : Ibcd Constant Does> @ dst over rs or *swap ms
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IF 10 or THEN >, ; ( dn dm ) ( an@- am@- )
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140400 Ibcd abcd 100400 Ibcd sbcd
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| : Idd Constant Does> @ dst over rs or *swap ms
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IF 10 or THEN sz3 >, ; ( dn dm ) ( an@- am@- )
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150400 Idd addx 110400 Idd subx
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| : Idea Constant Does> @ >r dn? ( ea dn ) ( dn ea )
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IF rd src r> or sz3 >, ,more
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ELSE extra? eas dst 400 or r> or sz3 >, ,extra THEN ;
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150000 Idea add 110000 Idea sub
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140000 Idea and 100000 Idea or
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| : Iead Constant Does> @ >r ??dn r> dst src
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>, ,more ; ( ea dn)
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040600 Iead chk 100300 Iead divu 100700 Iead divs
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140300 Iead mulu 140700 Iead muls
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\ *** Block No. 17 Hexblock 11
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\ arithmetic and control 15jan86we
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| : Iea Constant Does> @ src >, ,more ; ( ea )
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047200 Iea jsr 047300 Iea jmp
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042300 Iea move>ccr
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040300 Iea move<sr 043300 Iea move>sr
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044000 Iea nbcd 044100 Iea pea
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045300 Iea tas
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| : Ieas Constant Does> @ src sz3 >, ,more ; ( ea )
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041000 Ieas clr 043000 Ieas not
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042000 Ieas neg 040000 Ieas negx
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045000 Ieas tst
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| : Icon Constant Does> @ >, ;
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47160 Icon reset 47161 Icon nop
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47163 Icon rte 47165 Icon rts
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47166 Icon trapv 47167 Icon rtr
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\ *** Block No. 18 Hexblock 12
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\ structured conditionals +/- 256 bytes 15jan86we
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: THEN >here over 2+ - *swap 1+ >c! ;
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: IF >, >here 2- ; hex
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: ELSE 6000 IF *swap THEN ;
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: BEGIN >here ;
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: UNTIL >, >here - >here 1- >c! ;
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: AGAIN 6000 UNTIL ;
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: WHILE IF *swap ;
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: REPEAT AGAIN THEN ;
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: DO >here *swap ;
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: LOOP dbra ;
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6600 Constant 0= 6700 Constant 0<>
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6A00 Constant 0< 6B00 Constant 0>=
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6C00 Constant < 6D00 Constant >=
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6E00 Constant <= 6F00 Constant >
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6500 Constant CC 6400 Constant CS
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