mirror of
https://github.com/A2osX/A2osX.git
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283 lines
6.6 KiB
Plaintext
283 lines
6.6 KiB
Plaintext
PR#3
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PREFIX /A2OSX.SRC
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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.OP 65C02
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*--------------------------------------
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* S.LoadBinA
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* in :
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* A = hMem of FilePath (PSTRING)
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* out :
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* Y,A = MEMPTR
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* X = hMem of Code Segment
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*--------------------------------------
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S.LoadBinA sta S.LoadBinA.hFilename save file path
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jsr S.GetMemPtrA
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>STYA ZPQuickPtr1
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lda (ZPQuickPtr1)
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tay
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.1 lda (ZPQuickPtr1),y convert to UPPERCASE
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cmp #$61 "a"
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bmi .2
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cmp #$7B "z"+1
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bpl .2
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sec
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sbc #$20
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sta (ZPQuickPtr1),y
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.2 dey
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bne .1
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lda S.LoadBinA.hFilename
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jsr S.GetMemByNameA
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bcs .3 not already loaded
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>STYA ZPQuickPtr1 Save base address
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ldy #S.MEM.REFCNT
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lda (ZPQuickPtr1),y
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inc
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sta (ZPQuickPtr1),y
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ldy #S.MEM.PTR
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lda (ZPQuickPtr1),y
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pha Y,A = MEM PTR...
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iny
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lda (ZPQuickPtr1),y
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ply X=hMem from S.GetMemByNameA
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clc
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rts
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.3 lda S.LoadBinA.hFilename
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jsr S.LoadFileA
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bcc .4
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rts Error Loading file
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.4 >STYA S.LoadBinA.FileLen
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stx S.LoadBinA.hMem save hMem
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txa
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jsr S.GetMemPtrA
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>STYA ZPQuickPtr1 save base address for relocation
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ldy #H.BIN.CODE.LEN make AX = Code Len
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lda (ZPQuickPtr1),y
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sta R.AL
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iny
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lda (ZPQuickPtr1),y
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sta R.AH
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lda S.LoadBinA.hFilename
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jsr S.MLIGetFileInfoA Get File Info for AUXTYPE
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bcs .98
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>STYA ZPQuickPtr2
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ldy #2 get AUXTYPE
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lda (ZPQuickPtr2),y
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sta R.BL Make BX=Range Start=AUXTYPE
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sta S.LoadBinA.AuxType
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clc
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adc S.LoadBinA.FileLen
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sta R.CL Make CX=Range End=AUXTYPE+FILELEN
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iny
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lda (ZPQuickPtr2),y
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sta R.BH
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sta S.LoadBinA.AuxType+1
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adc S.LoadBinA.FileLen+1
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sta R.CH
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lda ZPQuickPtr1 Compute relocation offset in DX
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sec
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sbc S.LoadBinA.AuxType
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sta R.DL DX=Offset=ZPQuickPtr1-AUXTYPE
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lda ZPQuickPtr1+1
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sbc S.LoadBinA.AuxType+1
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sta R.DH
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>LDYA ZPQuickPtr1
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jsr S.BinRelocateYA
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bcs .98 relocation error, dicard Code segment
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lda S.LoadBinA.hFilename get back bin path
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jsr S.PStrCpyA
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bcs .98
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pha save copy of bin path
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lda S.LoadBinA.hMem
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jsr S.GetMemByIDA
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>STYA ZPQuickPtr1
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lda (ZPQuickPtr1)
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ora #S.MEM.F.CODE This is a code segment
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sta (ZPQuickPtr1)
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ldy #S.MEM.BIN
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pla get back copy of bin path
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sta (ZPQuickPtr1),y
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lda S.LoadBinA.hMem
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tax return hMEM to Caller...
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jsr S.GetMemPtrA
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clc ...and Y,A=PTR to CS
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rts
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.98 pha
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lda S.LoadBinA.hMem
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jsr S.FreeMemA Discard Loaded Code
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pla
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sec
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rts
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*--------------------------------------
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S.LoadBinA.hFilename .BS 1
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S.LoadBinA.hMem .BS 1
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S.LoadBinA.AuxType .BS 2
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S.LoadBinA.FileLen .BS 2
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*--------------------------------------
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* S.BinRelocateYA :
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* YA = Ptr to Code
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* R.AX = Code Length
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* R.BX = Range Start address to relocate
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* R.CX = Range End address to relocate
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* R.DX = offset to apply to all abs addresses between R.BX and R.CX
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*--------------------------------------
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S.BinRelocateYA >STYA ZPQuickPtr1
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ldy #H.BIN.JMP relocate Main JMP
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lda (ZPQuickPtr1),y
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clc
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adc R.DL
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sta (ZPQuickPtr1),y
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iny
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lda (ZPQuickPtr1),y
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adc R.DH
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sta (ZPQuickPtr1),y
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ldy #H.BIN.RELOC.TABLE skip Header, CS.SIZE & DS.SIZE... (16 bytes)
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bra S.JmpRelocate
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S.DrvRelocateYA >STYA ZPQuickPtr1
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ldy #0
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S.JmpRelocate lda (ZPQuickPtr1),y Start Relocate JMP table
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tax
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iny
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ora (ZPQuickPtr1),y
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beq S.CodeRelocate $0000 = end of table
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dey
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txa
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clc
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adc R.DL
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sta (ZPQuickPtr1),y
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iny
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lda (ZPQuickPtr1),y
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adc R.DH
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sta (ZPQuickPtr1),y
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iny
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bra S.JmpRelocate
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S.CodeRelocate lda ZPQuickPtr1
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clc
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adc R.AL Make ZPQuickPtr2=End of code
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sta ZPQuickPtr2 =ZPQuickPtr1+AX (code len)
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lda ZPQuickPtr1+1
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adc R.AH
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sta ZPQuickPtr2+1
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iny
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tya add current offset in Y to Ptr
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clc
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adc ZPQuickPtr1
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sta ZPQuickPtr1
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bcc .5
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inc ZPQuickPtr1+1 ZPQuickPtr1=Current Code PTR
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clc
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.5 lda (ZPQuickPtr1) get OPCODE
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tax
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lda OPCODES,x get OPCODE definition
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bpl .7 abs addressing?
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and #3 save Opcode length...
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pha
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ldy #1
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lda (ZPQuickPtr1),y Get LO
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sec
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sbc R.BL
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iny
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lda (ZPQuickPtr1),y Get HI
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sbc R.BH
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bcc .6 addr < AX, out of range
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dey
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lda (ZPQuickPtr1),y Get LO
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sec
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sbc R.CL
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iny
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lda (ZPQuickPtr1),y Get HI
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sbc R.CH
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bcs .6 addr > CX, out of range
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dey
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lda (ZPQuickPtr1),y Get LO
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clc
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adc R.DL add DX to abs address
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sta (ZPQuickPtr1),y store relocated addr LO
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iny
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lda (ZPQuickPtr1),y Get HI
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adc R.DH
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sta (ZPQuickPtr1),y store relocated addr HI
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.6 pla
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.7 clc A = OPCODE length
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adc ZPQuickPtr1
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sta ZPQuickPtr1
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bcc .8
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inc ZPQuickPtr1+1
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.8 lda ZPQuickPtr1 is Current PTR < Code Limit ?
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sec
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sbc ZPQuickPtr2
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lda ZPQuickPtr1+1
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sbc ZPQuickPtr2+1
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bcc .5 yes, continue relocating
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clc
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rts
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*--------------------------------------
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* 65C02 OPCODES
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* Bit 7 : 1 absolute addressing
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* Bit 1-0 : opcode + @ length
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*--------------------------------------
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* x0.x1.x2.x3.x4.x5.x6.x7.x8.x9.xA.xB.xC.xD.xE.xF
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OPCODES .HS 01.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.83.83.83.03
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.HS 83.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.83.83.83.03
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.HS 01.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.01.83.83.03
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.HS 01.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.01.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.02.01.01.83.83.83.03
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.HS 02.02.02.01.02.02.02.02.01.83.01.01.01.83.83.03
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*--------------------------------------
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MAN
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SAVE SYS/KERNEL.S.BIN
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LOAD SYS/KERNEL.S
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ASM
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