mirror of
https://github.com/A2osX/A2osX.git
synced 2024-08-01 16:29:01 +00:00
375 lines
9.4 KiB
Plaintext
375 lines
9.4 KiB
Plaintext
NEW
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AUTO 3,1
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*--------------------------------------
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* relocation subroutine. on entry, regs yx = address of parameter table
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* with the following parameters:
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*
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* (1) command: 0 = zero destination range
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* 1 = move data from src to dst
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* 2 = hi addr ref tbl, relocate and move
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* 3 = lo/hi addr ref tbl, relocate and move
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* 4 = program, relocate and move
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* >4 = end of sequence of commands
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* (2) destination
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* (2) length
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* (2) source
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* (1) # of address ranges (n) to be relocated
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* (n+1) list of low page addresses to be relocated
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* (n+1) list of high page addresses to be relocated
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* (n+1) list of offset amounts to be added to be added
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* if low and high limits have not been met
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*
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* on exit, carry set if error and yx = addr of error
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* with acc = $00 for table error or $FF if illegal opcode
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reloc stx idxl save address of control table
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sty idxl+1
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rloop lda (idxl) get relocation command.
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cmp #$05
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bcs rlend taken if >= 5 then done.
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tax move destination to page 0
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ldy #$01 for indirect access.
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lda (idxl),y
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sta dst
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iny
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lda (idxl),y
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sta dst+1
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iny
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lda (idxl),y also the length (byte count)
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sta cnt of the destination area.
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iny
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lda (idxl),y
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sta cnt+1
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bmi rlerr branch if >= 32k.
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txa is it a request to zero destination?
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beq zero if yes.
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iny
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lda (idxl),y get source address.
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sta src used for move.
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sta cde used for relocation
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iny
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clc
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adc cnt add length to get final address
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sta ecde
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lda (idxl),y
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sta src+1
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sta cde+1
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adc cnt+1
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sta ecde+1
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dex test for 'move' command
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beq H2AA3 branch if move only (no relocation)
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stx wsize save element size (1,2,3)
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iny
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lda (idxl),y get # of ranges that are valid
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sta sgcnt relocation target addresses.
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tax separate serial range groups into tbls
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H2A42 iny
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lda (idxl),y transfer low limits to 'limlo' table
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sta limlo,x
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dex
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bpl H2A42
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ldx sgcnt # of ranges
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H2A4E iny
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lda (idxl),y transfer high limits to 'limhi' table
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sta limhi,x
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dex
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bpl H2A4E
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ldx sgcnt # of ranges
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H2A5A iny
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lda (idxl),y transfer offsets to 'ofset' table
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sta ofset,x
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dex
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bpl H2A5A
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jsr adjtbl adj index pointer to next entry.
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ldx wsize test for machine code relocation
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cpx #$03
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beq rlcode branch if program relocation
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jsr reladr otherwise, relocate addresses in
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H2A70 jsr moveSrcDst tables then move to destination.
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bra rloop do next table
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rlend clc
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rts
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rlerr jmp tblerr
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rlcode jsr rlprog relocate machine code refs
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bra H2A70
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* fill destination range with 0's
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zero jsr adjtbl adj table pointer to next entry.
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lda #$00
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ldy cnt+1 is it at least 1 page?
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beq H2A94 branch if not.
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tay
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H2A89 sta (dst),y
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iny
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bne H2A89
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inc dst+1 next page
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dec cnt+1
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bne H2A89 if more pages to clear.
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H2A94 ldy cnt any bytes left to 0?
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beq H2AA0 if not.
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tay
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H2A99 sta (dst),y zero out remainder
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iny
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cpy cnt
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bcc H2A99
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H2AA0 jmp rloop
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H2AA3 jsr adjtbl
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bra H2A70
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adjtbl tya add previous table length to
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sec get next entry position in table
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adc idxl
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sta idxl
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bcc H2AB2
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inc idxl+1
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H2AB2 rts
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moveSrcDst lda src+1 is move up, down or not at all?
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cmp dst+1
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bcc movup
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bne movdn
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lda src
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cmp dst
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bcc movup
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bne movdn
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rts no move.
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movup ldy cnt+1 calc highest page to move up
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tya and adj src and dst.
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clc
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adc src+1
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sta src+1
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tya
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clc
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adc dst+1
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sta dst+1
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ldy cnt move partial page 1st.
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beq H2ADE taken if no partial pages
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H2AD6 dey
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lda (src),y
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sta (dst),y
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tya end of page transfer?
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bne H2AD6 no
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H2ADE dec dst+1
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dec src+1
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dec cnt+1 done with all pages?
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bpl H2AD6 no
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rts
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movdn ldy #$00
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lda cnt+1 partial page move only?
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beq H2AFC taken if < 1 page to move
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H2AED lda (src),y
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sta (dst),y
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iny
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bne H2AED
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inc dst+1 next page
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inc src+1
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dec cnt+1 more pages?
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bne H2AED if more.
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H2AFC lda cnt move partial page.
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beq H2B09 if no more to move
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H2B00 lda (src),y
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sta (dst),y
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iny
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cpy cnt
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bne H2B00
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H2B09 rts
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* relocate addresses
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reladr ldy wsize 1 or 2 byte reference
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dey
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lda (cde),y
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jsr adjadr relocate reference.
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lda wsize update and test code pointer.
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jsr adjcde
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bcc reladr if more to do
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rts
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rlprog ldy #$00 get next opcode
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lda (cde),y
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jsr oplen determine if a 3 byte instruction.
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beq rperr branch if not an opcode
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cmp #$03
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bne H2B30
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ldy #$02
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jsr adjadr relocate address
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lda #$03
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H2B30 jsr adjcde update and test if done.
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bcc rlprog if more to do
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rts
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rperr pla
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pla
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ldx cde bad code address in y,x
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ldy cde+1
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lda #$FF indicates bad opcode
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sec
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rts
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tblerr ldx idxl bad table address in y,x
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ldy idxl+1
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lda #$00 indicates input table error
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sec
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rts
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adjadr lda (cde),y get page address and
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ldx sgcnt test against limits.
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H2B4D cmp limlo,x is it >= low?
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bcc H2B59 if not.
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cmp limhi,x is it <= high?
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bcc H2B5D branch if it is
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beq H2B5D
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H2B59 dex try next limit set
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bpl H2B4D
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rts return w/o adjustment.
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H2B5D clc add offset to form relocated
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adc ofset,x page address and replace
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sta (cde),y old address with result.
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rts
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adjcde clc update code pointer
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adc cde
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ldy cde+1
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bcc H2B6C branch if not page cross
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iny otherwise, update page#.
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H2B6C cpy ecde+1 has all code/data been processed?
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bcc H2B72 if not.
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cmp ecde
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H2B72 sta cde save updated values.
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sty cde+1
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rts return result (carry set = done).
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oplen pha form index to tbl & which 2-bit group.
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and #$03 low 2 bits specify group
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tay
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pla
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lsr upper 6 bits specify byte in table
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lsr
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tax
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lda opcodln,x
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nxgroup dey is opcode len in lowest 2 bits of acc?
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bmi H2B89 branch if it is
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lsr shift to next group.
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lsr (if length = 0 then error)
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bne nxgroup
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H2B89 and #$03
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rts if z-set then error
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* relocation table contains length of each opcode in 2-bit groups
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opcodln .HS 0928193C0A280D3C
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.HS 0B2A193F0A280D3C
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.HS 0928193F0A280D3C
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.HS 0928193F0A280D3C
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.HS 082A113F0A2A1D0C
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.HS 2A2A193F0A2A1D3F
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.HS 0A2A193F0A280D3C
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.HS 0A2A193F0A280D3C
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wsize .HS 00
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sgcnt .HS 00
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limlo .HS 0000000000000000
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limhi .HS 0000000000000000
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ofset .HS 0000000000000000
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* patch to gsos vectors so error is returned for os calls - rev note #101
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patch101 php
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sei disable interrupts
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clc
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xce full native mode
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>LONGMX
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phb save DBR
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pha
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pha
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pea $0000 length of patch
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pea $0010 0000/0010 = 16 bytes
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pea $3101 user id for prodos 8
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pea $8018 attributes (locked/nospec/nocross)
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pha
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pha
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>IIGS NewHandle
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lda $01,s retrieve handle
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tax
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lda $03,s
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tay
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pea $0000 copy the code into the handle
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pea L2C4D
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phy
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phx
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pea $0000 length of patch = 0000/0010
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pea $0010
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>IIGS PtrToHand
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plx low word of handle
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plb set DBR to handle's bank
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lda >1,x get upper 16 bits of 24 bit address
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tay save in y
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lda >0,x get low 8 bits of address
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and ##$00FF clear high byte
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xba put address in high byte
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ora ##$005C include JML opcode
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sta GSOS2 store in gsos vectors
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clc
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adc ##$000B
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sta GSOS
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tya store upper 16 bits too
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sta GSOS2+2
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adc ##$0000 adj for possible page crossing
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sta GSOS+2
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plb remove garbage byte from stack
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plb restore DBR.
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sec
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xce back to emulation mode
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plp
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rts
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* copy of the code that goes in the handle
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L2C4D lda 1,s
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sta 7,s
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lda 2,s
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sta 8,s
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pla
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pla
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pla
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lda ##$00FF #NoOS
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sec
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rtl
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.BS $2C80-*
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RAMDRV.Install ldy #$99 move $9A bytesfrom lcsrc to lcdest.
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.1 lda RAM,y transfer main bank portion of driver
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sta RAMDRV,y
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dey
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cpy #$FF
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bne .1
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ldx #RAMX set up to move aux portion of driver
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stx A1L
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dex
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stx A2L
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ldx /RAMX
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stx A1L+1
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inx
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stx A2L+1
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lda #RAMXDRV
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sta A4L
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lda /RAMXDRV RAMX to RAMXDRV
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sta A4L+1
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sec irection = to aux bank.
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jsr auxmove move aux bank portion of driver.
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lda #RAMDRV put driver address into
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sta drivertbl2+6 slot 3, drive 2.
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lda /RAMDRV
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sta drivertbl2+7
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inc numdevs count (-1) active devices
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ldx numdevs
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lda #$BF unit num of /RAM
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sta devlist,x
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rts
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RAM_1_END .EQ * end of /RAM installer
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.BS $2D00-* pad 0's to page boundary
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MAN
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SAVE USR/SRC/PRODOS.FX/PRODOS.S.LDR.B
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LOAD USR/SRC/PRODOS.FX/PRODOS.S
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ASM
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