172 lines
6.8 KiB
OpenEdge ABL
172 lines
6.8 KiB
OpenEdge ABL
; do *NOT* use register4 to register7 during time slicing
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realTimeAddr EQU register0
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realTimeProc0 EQU register1
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realTimeProc1 EQU register2
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realTimeProc2 EQU register3
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numericLabel EQU register0
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defaultLabel EQU register1
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lutLabs EQU register2
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lutAddrs EQU register3
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lutIndex EQU register8
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romType EQU register0
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romErrAddr EQU register1
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romErrPixel EQU register2
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romExec_vLR EQU register0
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romReadAddr EQU register0
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%SUB romCheck
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romCheck LD giga_romType
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ANDI 0xFC
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SUBW romType
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BGE romC_return
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LDWI giga_vram + giga_yres/2*256 + giga_xres/2
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STW romErrAddr
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romC_loop LD romErrPixel
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POKE romErrAddr
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INC romErrPixel
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BRA romC_loop ; flash center pixel indicating rom error
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romC_return RET
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%ENDS
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%SUB romExec
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romExec LDW romExec_vLR
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STW giga_vLR
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LDI SYS_Exec_88 ; address < 0x0100 so use LDI
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STW giga_sysFn
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SYS 88 ; doesn't return from here!
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%ENDS
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%SUB romRead
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romRead LDI SYS_ReadRomDir_v5_80 ; address < 0x0100 so use LDI
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STW giga_sysFn
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LDW romReadAddr
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SYS 80
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RET
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%ENDS
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%SUB realTimeStub
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; runs real time, (time sliced), code at regular intervals
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; self modifying code allows for timer, midi and user procs
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realTimeStub RET ; RET gets replaced by PUSH
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LDWI 0x0000 ; 0x0000 gets replaced by realTimeProc0 address
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CALL giga_vAC
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realTimeStub1 POP
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RET
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RET ; POP + 2xRET gets replaced by LDWI realTimeProc1 address
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CALL giga_vAC
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realTimeStub2 POP
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RET
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RET ; POP + 2xRET gets replaced by LDWI realTimeProc2 address
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CALL giga_vAC
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POP
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RET
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%ENDS
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%SUB setRealTimeProc0
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setRealTimeProc0 LDWI realTimeStub
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STW realTimeAddr
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LDI 0x75
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POKE realTimeAddr ; replace RET with PUSH
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INC realTimeAddr
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INC realTimeAddr ; realTimeStub + 2
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LDW realTimeProc0
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DOKE realTimeAddr ; replace 0x0000 with proc
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RET
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%ENDS
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%SUB setRealTimeProc1
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setRealTimeProc1 PUSH
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LDWI setRealTimeProc0
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CALL giga_vAC
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LDWI realTimeStub1
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STW realTimeAddr
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LDI 0x11
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POKE realTimeAddr ; replace POP with LDWI
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INC realTimeAddr ; realTimeStub + 1
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LDW realTimeProc1
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DOKE realTimeAddr ; replace 2xRET with proc
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POP
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RET
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%ENDS
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%SUB setRealTimeProc2
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setRealTimeProc2 PUSH
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LDWI setRealTimeProc1
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CALL giga_vAC
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LDWI realTimeStub2
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STW realTimeAddr
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LDI 0x11
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POKE realTimeAddr ; replace POP with LDWI
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INC realTimeAddr ; realTimeStub + 1
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LDW realTimeProc2
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DOKE realTimeAddr ; replace 2xRET with proc
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POP
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RET
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%ENDS
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%SUB gotoNumericLabel
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; find numeric label and jump to it
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gotoNumericLabel LDWI _lut_numericLabs
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STW lutLabs
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STW lutIndex
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LDWI _lut_numericAddrs
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STW lutAddrs
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gotoNL_loop LDW lutIndex
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DEEK
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BNE gotoNL_cont ; check for 0
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LDW defaultLabel
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BEQ gotoNL_exit
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CALL defaultLabel ; fetch default address and jump, (note we never return from here)
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gotoNL_exit RET
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gotoNL_cont SUBW numericLabel
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BEQ gotoNL_found
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INC lutIndex
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INC lutIndex
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BRA gotoNL_loop ; loop through lut until found or 0
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gotoNL_found LDW lutIndex
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SUBW lutLabs
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ADDW lutAddrs
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DEEK
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CALL giga_vAC ; fetch label address and jump, (note we never return from here)
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%ENDS
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%SUB gosubNumericLabel
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; find numeric label and call it, (it had better return or welcome to lala land)
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gosubNumericLabel PUSH
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LDWI _lut_numericLabs
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STW lutLabs
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STW lutIndex
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LDWI _lut_numericAddrs
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STW lutAddrs
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gosubNL_loop LDW lutIndex
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DEEK
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BNE gosubNL_cont ; check for 0
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LDW defaultLabel
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BEQ gosubNL_exit
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CALL defaultLabel ; fetch default address and call
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gosubNL_exit POP
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RET
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gosubNL_cont SUBW numericLabel
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BEQ gosubNL_found
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INC lutIndex
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INC lutIndex
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BRA gosubNL_loop ; loop through lut until found or 0
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gosubNL_found LDW lutIndex
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SUBW lutLabs
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ADDW lutAddrs
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DEEK
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CALL giga_vAC ; fetch label address and call
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POP
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RET
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%ENDS |