NEW PREFIX /A2OSX.BUILD AUTO 4,1 *-------------------------------------- * LoadLib * in : * Y,A = PTR To "LibName.o" C-String * out : * A = hMem To loaded LIB *-------------------------------------- K.LoadLib jsr BIN.FindLIB bcs .9 jsr BIN.Load Y,A = "/PATH/BIN" bcs .9 stx .8+1 >STYA .1+1 txa Pass hLib to LibLoad ldx #LIBMGR.LOAD .1 jsr $ffff Self Modified, Call LIB.LOAD function bcs .99 .8 lda #$ff hLib clc .9 rts .99 pha lda .8+1 jsr K.FreeMem pla sec rts *-------------------------------------- * UnloadLib * in : * A = hMem To Lib * out : *-------------------------------------- K.UnloadLib pha jsr K.GetMemByID >STYA ZPPtr1 ldy #S.MEM.REFCNT lda (ZPPtr1),y Get count of those referencing this lib dec only one left ? beq .1 sta (ZPPtr1),y pla clc rts .1 ldy #S.MEM.PTR lda (ZPPtr1),y sta .2+1 iny lda (ZPPtr1),y sta .2+2 ldx #LIBMGR.UNLOAD .2 jsr $ffff Self Modified, Call LIB.UNLOAD function pla jmp K.FreeMem */-------------------------------------- * # LoadDrv * ## ASM * **In:** * Y,A = PTR to "NAME.DRV [PARAM]" C-String * ## RETURN VALUE * none *\-------------------------------------- K.LoadDrv >STYA .2+1 Save "BIN\0ARGS\0\0" jsr BIN.FindDRV bcs .9 jsr BIN.Load Y,A = "/PATH/BIN" bcs .9 >STYA .3+1 stx .97+1 ldx #$ff .1 inx Skip "BIN" .2 lda $ffff,x bne .1 txa sec adc .2+1 tay lda #0 adc .2+2 Y,A = ARGS .3 jsr $ffff SELF MODIFIED, call Dev.Detect bcs .96 jsr .96 Cleanup... lda #0 Make sure RC = 0 if success clc .9 rts .96 pha .97 lda #$ff jsr K.FreeMem pla sec rts *-------------------------------------- BIN.FindLIB clc .HS B0 bcs BIN.FindDRV sec >STYA BIN.CmdLine >LDYAI BIN.Find.ENV.LIB bcc .1 >LDYAI BIN.Find.ENV.DRV .1 jsr K.GetEnv get value for Search Path bcs .9 >STYA K.FileSearch.SearchPath >LDYA BIN.CmdLine jsr K.FileSearch.YA find LIB/DRV in Search bcs .9 >LDYAI K.Buf256 clc .9 rts *-------------------------------------- BIN.Find.ENV.DRV .AZ "DRV" BIN.Find.ENV.LIB .AZ "LIB" *-------------------------------------- * BIN.Load * in : * Y,A = /BIN/PATH (CSTR) * out : * Y,A = MEMPTR * X = hMem of Code Segment *-------------------------------------- BIN.Load >STYA BIN.CmdLine >STYA .2+1 >LDYAI Mem.Table >STYA ZPPtr1 ldx #0 we will skip Slot 0... .1 cpx Mem.LastSlot beq BIN.Load.1 inx lda ZPPtr1 clc adc #S.MEM sta ZPPtr1 bcc .11 inc ZPPtr1+1 .11 lda (ZPPtr1) bpl .1 In Use? ldy #S.MEM.BIN any BIN PATH in this slot? lda (ZPPtr1),y beq .1 jsr K.GetMemPtr X unmodified, get pathname >STYA .3+1 ldy #0 .2 lda $ffff,y SELF MODIFIED .3 cmp $ffff,y SELF MODIFIED bne .1 iny ora #0 bne .2 ldy #S.MEM.REFCNT lda (ZPPtr1),y inc sta (ZPPtr1),y ldy #S.MEM.PTR lda (ZPPtr1),y pha iny lda (ZPPtr1),y ply clc rts X=hMem, Y,A=Ptr *-------------------------------------- BIN.Load.1 >PUSHWI K.S.STAT >LDYA BIN.CmdLine >SYSCALL STAT BANK1!!! Look for AUXTYPE bcs .9 >LDYA K.S.STAT+S.STAT.P.AUXTYPE >STYA BIN.R.CS.Start >PUSHYA Push AUXTYPE >PUSHBI S.FI.T.BIN >PUSHBI O.RDONLY >LDYA BIN.CmdLine >SYSCALL LoadFile BANK1!!! .9 bcs .99 Error Loading file stx BIN.hMem save hMem pha YA=CODE+DATA size tya * clc CC from bcs .99 adc BIN.R.CS.Start Get AUXTYPE for actual Base Address sta BIN.R.End compute Range End=AUXTYPE+FILELEN pla adc BIN.R.CS.Start+1 sta BIN.R.End+1 txa jsr K.GetMemPtr >STYA ZPPtr1 set ZPPtr1 -> Code start pha YA = actual load address tya sec sbc BIN.R.CS.Start sta BIN.R.Offset Offset=ZPPtr1-AUXTYPE pla sbc BIN.R.CS.Start+1 sta BIN.R.Offset+1 ldy #H.BIN.CS.SIZE get Code Len lda (ZPPtr1),y clc adc BIN.R.CS.Start sta BIN.R.CS.End ZPPtr1 + CodeLen iny lda (ZPPtr1),y adc BIN.R.CS.Start+1 sta BIN.R.CS.End+1 jsr BIN.RelExe >LDYA BIN.CmdLine get back bin path jsr K.NewStr make a copy of this string bcs .98 lda BIN.hMem Keep X=hMem jsr K.GetMemByID X unmodified >STYA ZPPtr1 lda (ZPPtr1) ora #S.MEM.F.CODE This is a code segment sta (ZPPtr1) txa Get Back hMem ldy #S.MEM.BIN sta (ZPPtr1),y lda BIN.hMem tax return hMEM to Caller... jmp K.GetMemPtr ...and Y,A=PTR to CS .98 pha lda BIN.hMem jsr K.FreeMem Discard Loaded Code pla sec .99 rts *-------------------------------------- BIN.CmdLine .BS 2 BIN.hMem .BS 1 */-------------------------------------- * # InsDrv * ## C * `void * insdrv (void * src, void * crvcsstart, void * drvcsend, void * drvend);` * ## ASM * **In:** * `>PUSHW DRV.END` * `>PUSHW DRV.CS.END` * `>PUSHW DRV.CS.START` * `>LDYA L.SRC` * `SYSCALL insdrv` * ## RETURN VALUE * Y,A = Ptr to installed driver *\-------------------------------------- K.InsDrv >STYA ZPPtr1 >PULLW BIN.R.CS.Start >PULLW BIN.R.CS.End >PULLW BIN.R.End lda BIN.R.End Compute DRVLen=End-start sec sbc BIN.R.CS.Start sta BIN.Move.Len lda BIN.R.End+1 sbc BIN.R.CS.Start+1 sta BIN.Move.Len+1 lda DevMgr.Free Compute new DevMgr.Free clc adc BIN.Move.Len tay Save DRVEnd LO lda DevMgr.Free+1 adc BIN.Move.Len+1 A = DRVEnd HI bcs .9 we crossed $FFFF, out of mem cpy #DevMgr.HiMem sbc /DevMgr.HiMem bcs .9 No More Room to load Driver.... >LDYA DevMgr.Free jsr BIN.MoveToYA lda DevMgr.Free sta ZPPtr1 sec sbc BIN.R.CS.Start sta BIN.R.Offset lda DevMgr.Free+1 sta ZPPtr1+1 sbc BIN.R.CS.Start+1 sta BIN.R.Offset+1 jsr BIN.RelDrv lda DevMgr.Free tay clc adc BIN.Move.Len sta DevMgr.Free lda DevMgr.Free+1 pha adc BIN.Move.Len+1 sta DevMgr.Free+1 pla clc rts .9 lda #E.OOM sec rts *-------------------------------------- BIN.Move.Len .BS 2 *-------------------------------------- BIN.MoveToYA >STYA ZPPtr2 lda BIN.Move.Len+1 eor #$ff pha lda BIN.Move.Len eor #$ff tax ldy #0 .1 inx bne .2 pla inc beq .3 pha .2 lda (ZPPtr1),y sta (ZPPtr2),y iny bne .1 inc ZPPtr1+1 inc ZPPtr2+1 bra .1 .3 rts *-------------------------------------- * BIN.Rel___ : *-------------------------------------- BIN.R.CS.Start .BS 2 BIN.R.CS.End .BS 2 BIN.R.End .BS 2 BIN.R.Offset .BS 2 *-------------------------------------- BIN.RelExe ldy #H.BIN.T+1 lda (ZPPtr1),y cmp /H.BIN.T.BIN65 beq .1 cmp /H.BIN.T.DRV65 beq .1 lda #E.IBIN sec rts .1 ldy #H.BIN.JMP relocate Main JMP lda (ZPPtr1),y clc adc BIN.R.Offset sta (ZPPtr1),y iny lda (ZPPtr1),y adc BIN.R.Offset+1 sta (ZPPtr1),y ldy #H.BIN.EXE.REL.TABLE skip Header, CS.SIZE & DS.SIZE... (16 bytes) .HS 2C bit abs *-------------------------------------- BIN.RelDrv ldy #H.BIN.DRV.REL.TABLE .1 lda (ZPPtr1),y Start Relocate JMP table tax LO in X iny lda (ZPPtr1),y HI in A beq .2 $00xx = end of table cpx BIN.R.CS.Start sbc BIN.R.CS.Start+1 bcc .11 addr < BIN.R.CS.Start, out of range txa Get back LO cpx BIN.R.End lda (ZPPtr1),y Get HI sbc BIN.R.End+1 bcs .11 addr > BIN.R.End, out of range dey txa get back LO clc adc BIN.R.Offset sta (ZPPtr1),y iny lda (ZPPtr1),y adc BIN.R.Offset+1 sta (ZPPtr1),y .11 iny bra .1 *-------------------------------------- .2 tya add current offset in Y to Ptr sec + 1 to skip last 00 from beq .2 adc ZPPtr1 sta ZPPtr1 bcc .3 inc ZPPtr1+1 ZPPtr1=Current Code PTR .3 lda BIN.R.CS.End compute new CS.END to stop relocating clc adc BIN.R.Offset sta .7+1 lda BIN.R.CS.End+1 adc BIN.R.Offset+1 sta .71+1 lda (ZPPtr1) get OPCODE lsr /2 tax lda BIN.65816,x get OPCODE definition bcs .4 go get LO nibble lsr lsr move HI -> LO lsr lsr .4 and #$0f bit #$8 abs addressing? beq .6 no.... and #7 save Opcode length... pha ldy #1 lda (ZPPtr1),y Get LO tax save LO in X iny make Y point to HI lda (ZPPtr1),y Get HI cpx BIN.R.CS.Start sbc BIN.R.CS.Start+1 bcc .5 addr < BIN.R.CS.Start, out of range txa Get back LO cpx BIN.R.End lda (ZPPtr1),y Get HI sbc BIN.R.End+1 bcs .5 addr > BIN.R.End, out of range txa Get back LO * clc CC from bcs .6 adc BIN.R.Offset add Offset to abs address dey sta (ZPPtr1),y store relocated addr LO iny lda (ZPPtr1),y Get HI adc BIN.R.Offset+1 sta (ZPPtr1),y store relocated addr HI .5 pla get back Opcode length... .6 clc A = OPCODE length adc ZPPtr1 sta ZPPtr1 bcc .7 inc ZPPtr1+1 .7 eor #$ff SELF MODIFIED A = ZPPtr1 bne .3 lda ZPPtr1+1 .71 eor #$ff SELF MODIFIED bne .3 next opcode.... .8 rts *-------------------------------------- * 6502/65C02/65816 OPCODES * Bit 3 : 1 = absolute addressing * Bit 2-1-0 : opcode + @ length *-------------------------------------- * 0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F BIN.65816 * TO DO : Make 2 different tables * http://axis.llx.com/~nparker/a2/opcodes.html *-------------------------------------- * 65R02 OPCODES *-------------------------------------- * 0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F BIN.65R02 .HS 1.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3 .HS B.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3 .HS 1.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.1.B.B.3 .HS 1.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.1.B.B.3 .HS 2.2.2.1.2.2.2.2.1.2.1.1.B.B.B.3 .HS 2.2.2.1.2.2.2.2.1.B.1.1.1.B.B.3 *-------------------------------------- MAN SAVE /A2OSX.SRC/SYS/KERNEL.S.BIN LOAD /A2OSX.SRC/SYS/KERNEL.S ASM