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https://github.com/irmen/prog8.git
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498 lines
12 KiB
Lua
498 lines
12 KiB
Lua
; Prog8 definitions for the Neo6502
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%option no_symbol_prefixing, ignore_unused
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neo {
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&uword NMI_VEC = $FFFA ; 6502 nmi vector, determined by the kernal if banked in
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&uword RESET_VEC = $FFFC ; 6502 reset vector, determined by the kernal if banked in
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&uword IRQ_VEC = $FFFE ; 6502 interrupt vector, determined by the kernal if banked in
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%asminclude "library:neo/neo6502.asm"
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}
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sys {
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; ------- lowlevel system routines --------
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const ubyte target = 7 ; compilation target specifier. 255=virtual, 128=C128, 64=C64, 32=PET, 16=CommanderX16, 8=atari800XL, 7=Neo6502
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const ubyte SIZEOF_BOOL = 1
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const ubyte SIZEOF_BYTE = 1
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const ubyte SIZEOF_UBYTE = 1
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const ubyte SIZEOF_WORD = 2
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const ubyte SIZEOF_UWORD = 2
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const ubyte SIZEOF_FLOAT = 0 ; undefined, no floats supported
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const byte MIN_BYTE = -128
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const byte MAX_BYTE = 127
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const ubyte MIN_UBYTE = 0
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const ubyte MAX_UBYTE = 255
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const word MIN_WORD = -32768
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const word MAX_WORD = 32767
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const uword MIN_UWORD = 0
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const uword MAX_UWORD = 65535
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; MIN_FLOAT and MAX_FLOAT are defined in the floats module if importec
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asmsub reset_system() {
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; Soft-reset the system back to initial power-on status
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; TODO
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%asm {{
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sei
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jmp (neo.RESET_VEC)
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}}
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}
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sub wait(uword jiffies) {
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; --- wait approximately the given number of jiffies (1/60th seconds)
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; TODO
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}
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asmsub waitvsync() clobbers(A) {
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; --- busy wait till the next vsync has occurred (approximately), without depending on custom irq handling.
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; TODO
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%asm {{
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nop
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rts
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}}
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}
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asmsub internal_stringcopy(uword source @R0, uword target @AY) clobbers (A,Y) {
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; Called when the compiler wants to assign a string value to another string.
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%asm {{
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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lda cx16.r0
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ldy cx16.r0+1
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jmp prog8_lib.strcpy
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}}
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}
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asmsub memcopy(uword source @R0, uword target @R1, uword count @AY) clobbers(A,X,Y) {
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; note: only works for NON-OVERLAPPING memory regions!
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; note: can't be inlined because is called from asm as well
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%asm {{
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ldx cx16.r0
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stx P8ZP_SCRATCH_W1 ; source in ZP
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ldx cx16.r0+1
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stx P8ZP_SCRATCH_W1+1
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ldx cx16.r1
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stx P8ZP_SCRATCH_W2 ; target in ZP
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ldx cx16.r1+1
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stx P8ZP_SCRATCH_W2+1
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cpy #0
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bne _longcopy
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; copy <= 255 bytes
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tay
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bne _copyshort
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rts ; nothing to copy
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_copyshort
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dey
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beq +
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- lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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dey
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bne -
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+ lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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rts
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_longcopy
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sta P8ZP_SCRATCH_B1 ; lsb(count) = remainder in last page
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tya
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tax ; x = num pages (1+)
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ldy #0
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- lda (P8ZP_SCRATCH_W1),y
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sta (P8ZP_SCRATCH_W2),y
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iny
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bne -
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inc P8ZP_SCRATCH_W1+1
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inc P8ZP_SCRATCH_W2+1
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dex
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bne -
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ldy P8ZP_SCRATCH_B1
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bne _copyshort
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rts
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}}
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}
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asmsub memset(uword mem @R0, uword numbytes @R1, ubyte value @A) clobbers(A,X,Y) {
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%asm {{
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ldy cx16.r0
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sty P8ZP_SCRATCH_W1
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ldy cx16.r0+1
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sty P8ZP_SCRATCH_W1+1
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ldx cx16.r1
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ldy cx16.r1+1
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jmp prog8_lib.memset
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}}
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}
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asmsub memsetw(uword mem @R0, uword numwords @R1, uword value @AY) clobbers(A,X,Y) {
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%asm {{
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ldx cx16.r0
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stx P8ZP_SCRATCH_W1
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ldx cx16.r0+1
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stx P8ZP_SCRATCH_W1+1
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ldx cx16.r1
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stx P8ZP_SCRATCH_W2
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ldx cx16.r1+1
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stx P8ZP_SCRATCH_W2+1
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jmp prog8_lib.memsetw
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}}
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}
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inline asmsub read_flags() -> ubyte @A {
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%asm {{
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php
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pla
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}}
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}
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inline asmsub clear_carry() {
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%asm {{
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clc
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}}
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}
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inline asmsub set_carry() {
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%asm {{
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sec
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}}
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}
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inline asmsub clear_irqd() {
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%asm {{
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cli
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}}
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}
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inline asmsub set_irqd() {
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%asm {{
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sei
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}}
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}
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inline asmsub irqsafe_set_irqd() {
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%asm {{
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php
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sei
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}}
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}
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inline asmsub irqsafe_clear_irqd() {
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%asm {{
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plp
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}}
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}
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sub disable_caseswitch() {
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; no-op
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}
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sub enable_caseswitch() {
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; no-op
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}
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asmsub save_prog8_internals() {
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%asm {{
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lda P8ZP_SCRATCH_B1
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sta save_SCRATCH_ZPB1
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lda P8ZP_SCRATCH_REG
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sta save_SCRATCH_ZPREG
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lda P8ZP_SCRATCH_W1
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sta save_SCRATCH_ZPWORD1
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lda P8ZP_SCRATCH_W1+1
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sta save_SCRATCH_ZPWORD1+1
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lda P8ZP_SCRATCH_W2
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sta save_SCRATCH_ZPWORD2
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lda P8ZP_SCRATCH_W2+1
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sta save_SCRATCH_ZPWORD2+1
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rts
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save_SCRATCH_ZPB1 .byte 0
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save_SCRATCH_ZPREG .byte 0
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save_SCRATCH_ZPWORD1 .word 0
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save_SCRATCH_ZPWORD2 .word 0
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; !notreached!
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}}
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}
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asmsub restore_prog8_internals() {
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%asm {{
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lda save_prog8_internals.save_SCRATCH_ZPB1
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sta P8ZP_SCRATCH_B1
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lda save_prog8_internals.save_SCRATCH_ZPREG
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sta P8ZP_SCRATCH_REG
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lda save_prog8_internals.save_SCRATCH_ZPWORD1
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sta P8ZP_SCRATCH_W1
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lda save_prog8_internals.save_SCRATCH_ZPWORD1+1
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sta P8ZP_SCRATCH_W1+1
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lda save_prog8_internals.save_SCRATCH_ZPWORD2
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sta P8ZP_SCRATCH_W2
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lda save_prog8_internals.save_SCRATCH_ZPWORD2+1
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sta P8ZP_SCRATCH_W2+1
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rts
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}}
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}
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asmsub exit(ubyte returnvalue @A) {
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; -- immediately exit the program with a return code in the A register
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%asm {{
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sta cleanup_at_exit._exitcode
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ldx prog8_lib.orig_stackpointer
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txs
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jmp cleanup_at_exit
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}}
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}
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asmsub exit2(ubyte resulta @A, ubyte resultx @X, ubyte resulty @Y) {
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; -- immediately exit the program with result values in the A, X and Y registers.
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%asm {{
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sta cleanup_at_exit._exitcode
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stx cleanup_at_exit._exitcodeX
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sty cleanup_at_exit._exitcodeY
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ldx prog8_lib.orig_stackpointer
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txs
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jmp cleanup_at_exit
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}}
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}
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asmsub exit3(ubyte resulta @A, ubyte resultx @X, ubyte resulty @Y, bool carry @Pc) {
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; -- immediately exit the program with result values in the A, X and Y registers, and the Carry flag in the status register.
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%asm {{
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sta cleanup_at_exit._exitcode
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lda #0
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rol a
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sta cleanup_at_exit._exitcodeCarry
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stx cleanup_at_exit._exitcodeX
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sty cleanup_at_exit._exitcodeY
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ldx prog8_lib.orig_stackpointer
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txs
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jmp cleanup_at_exit
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}}
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}
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inline asmsub progend() -> uword @AY {
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%asm {{
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lda #<prog8_program_end
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ldy #>prog8_program_end
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}}
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}
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inline asmsub progstart() -> uword @AY {
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%asm {{
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lda #<prog8_program_start
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ldy #>prog8_program_start
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}}
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}
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inline asmsub push(ubyte value @A) {
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%asm {{
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pha
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}}
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}
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inline asmsub pushw(uword value @AY) {
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%asm {{
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pha
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tya
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pha
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}}
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}
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inline asmsub pop() -> ubyte @A {
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%asm {{
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pla
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}}
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}
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inline asmsub popw() -> uword @AY {
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%asm {{
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pla
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tay
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pla
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}}
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}
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}
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cx16 {
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; the sixteen virtual 16-bit registers that the CX16 has defined in the zeropage
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; the sixteen virtual 16-bit registers in both normal unsigned mode and signed mode (s)
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&uword r0 = $0002
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&uword r1 = $0004
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&uword r2 = $0006
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&uword r3 = $0008
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&uword r4 = $000a
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&uword r5 = $000c
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&uword r6 = $000e
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&uword r7 = $0010
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&uword r8 = $0012
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&uword r9 = $0014
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&uword r10 = $0016
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&uword r11 = $0018
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&uword r12 = $001a
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&uword r13 = $001c
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&uword r14 = $001e
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&uword r15 = $0020
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&word r0s = $0002
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&word r1s = $0004
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&word r2s = $0006
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&word r3s = $0008
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&word r4s = $000a
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&word r5s = $000c
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&word r6s = $000e
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&word r7s = $0010
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&word r8s = $0012
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&word r9s = $0014
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&word r10s = $0016
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&word r11s = $0018
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&word r12s = $001a
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&word r13s = $001c
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&word r14s = $001e
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&word r15s = $0020
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&ubyte r0L = $0002
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&ubyte r1L = $0004
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&ubyte r2L = $0006
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&ubyte r3L = $0008
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&ubyte r4L = $000a
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&ubyte r5L = $000c
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&ubyte r6L = $000e
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&ubyte r7L = $0010
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&ubyte r8L = $0012
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&ubyte r9L = $0014
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&ubyte r10L = $0016
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&ubyte r11L = $0018
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&ubyte r12L = $001a
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&ubyte r13L = $001c
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&ubyte r14L = $001e
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&ubyte r15L = $0020
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&ubyte r0H = $0003
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&ubyte r1H = $0005
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&ubyte r2H = $0007
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&ubyte r3H = $0009
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&ubyte r4H = $000b
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&ubyte r5H = $000d
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&ubyte r6H = $000f
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&ubyte r7H = $0011
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&ubyte r8H = $0013
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&ubyte r9H = $0015
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&ubyte r10H = $0017
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&ubyte r11H = $0019
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&ubyte r12H = $001b
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&ubyte r13H = $001d
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&ubyte r14H = $001f
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&ubyte r15H = $0021
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&byte r0sL = $0002
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&byte r1sL = $0004
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&byte r2sL = $0006
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&byte r3sL = $0008
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&byte r4sL = $000a
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&byte r5sL = $000c
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&byte r6sL = $000e
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&byte r7sL = $0010
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&byte r8sL = $0012
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&byte r9sL = $0014
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&byte r10sL = $0016
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&byte r11sL = $0018
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&byte r12sL = $001a
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&byte r13sL = $001c
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&byte r14sL = $001e
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&byte r15sL = $0020
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&byte r0sH = $0003
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&byte r1sH = $0005
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&byte r2sH = $0007
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&byte r3sH = $0009
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&byte r4sH = $000b
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&byte r5sH = $000d
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&byte r6sH = $000f
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&byte r7sH = $0011
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&byte r8sH = $0013
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&byte r9sH = $0015
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&byte r10sH = $0017
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&byte r11sH = $0019
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&byte r12sH = $001b
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&byte r13sH = $001d
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&byte r14sH = $001f
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&byte r15sH = $0021
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asmsub save_virtual_registers() clobbers(A,Y) {
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%asm {{
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ldy #31
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- lda cx16.r0,y
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sta _cx16_vreg_storage,y
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dey
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bpl -
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rts
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_cx16_vreg_storage
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.word 0,0,0,0,0,0,0,0
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.word 0,0,0,0,0,0,0,0
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; !notreached!
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}}
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}
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asmsub restore_virtual_registers() clobbers(A,Y) {
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%asm {{
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ldy #31
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- lda save_virtual_registers._cx16_vreg_storage,y
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sta cx16.r0,y
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dey
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bpl -
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rts
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}}
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}
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sub cpu_is_65816() -> bool {
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; Returns true when you have a 65816 cpu, false when it's a 6502.
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return false
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}
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}
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p8_sys_startup {
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; program startup and shutdown machinery. Needs to reside in normal system ram.
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asmsub init_system() {
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; Initializes the machine to a sane starting state.
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; Called automatically by the loader program logic.
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%asm {{
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sei
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cld
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clc
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; TODO reset screen mode etc etc?
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clv
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; TODO what about IRQ handler? cli
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rts
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}}
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}
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asmsub init_system_phase2() {
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%asm {{
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rts ; no phase 2 steps on the Neo6502
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}}
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}
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asmsub cleanup_at_exit() {
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; executed when the main subroutine does rts
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%asm {{
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_exitcodeCarry = *+1
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lda #0
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lsr a
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_exitcode = *+1
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lda #0 ; exit code possibly modified in exit()
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_exitcodeX = *+1
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ldx #0
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_exitcodeY = *+1
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ldy #0
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rts
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}}
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}
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}
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