mirror of
https://github.com/irmen/prog8.git
synced 2024-12-25 23:29:55 +00:00
379 lines
9.7 KiB
Lua
379 lines
9.7 KiB
Lua
; Prog8 definitions for the Virtual Machine
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%option ignore_unused
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sys {
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; ------- lowlevel system routines --------
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const ubyte target = 255 ; 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 = 8
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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 imported
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sub reset_system() {
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; Soft-reset the system back to initial power-on Basic prompt.
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%ir {{
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syscall 0 ()
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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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%ir {{
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loadm.w r65535,sys.wait.jiffies
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syscall 13 (r65535.w)
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}}
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}
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sub waitvsync() {
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; --- busy wait till the next vsync has occurred (approximately), without depending on custom irq handling.
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%ir {{
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syscall 14()
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}}
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}
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sub internal_stringcopy(uword source, uword tgt) {
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; Called when the compiler wants to assign a string value to another string.
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%ir {{
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loadm.w r65534,sys.internal_stringcopy.source
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loadm.w r65535,sys.internal_stringcopy.tgt
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syscall 39 (r65534.w, r65535.w): r0.b
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}}
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}
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sub memcopy(uword source, uword tgt, uword count) {
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%ir {{
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loadm.w r65533,sys.memcopy.source
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loadm.w r65534,sys.memcopy.tgt
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loadm.w r65535,sys.memcopy.count
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syscall 36 (r65533.w, r65534.w, r65535.w)
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}}
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}
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sub memset(uword mem, uword numbytes, ubyte value) {
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%ir {{
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loadm.w r65533,sys.memset.mem
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loadm.w r65534,sys.memset.numbytes
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loadm.b r65535,sys.memset.value
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syscall 37 (r65533.w, r65534.w, r65535.b)
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}}
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}
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sub memsetw(uword mem, uword numwords, uword value) {
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%ir {{
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loadm.w r65533,sys.memsetw.mem
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loadm.w r65534,sys.memsetw.numwords
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loadm.w r65535,sys.memsetw.value
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syscall 38 (r65533.w, r65534.w, r65535.w)
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}}
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}
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sub memcmp(uword address1, uword address2, uword size) -> byte {
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; Compares two blocks of memory of up to 65535 bytes in size
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; Returns -1 (255), 0 or 1, meaning: block 1 sorts before, equal or after block 2.
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%ir {{
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loadm.w r65533,sys.memcmp.address1
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loadm.w r65534,sys.memcmp.address2
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loadm.w r65535,sys.memcmp.size
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syscall 47 (r65533.w, r65534.w, r65535.w) : r0.b
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returnr.b r0
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}}
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}
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sub exit(ubyte returnvalue) {
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; -- immediately exit the program with a return code in the A register
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%ir {{
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loadm.b r65535,sys.exit.returnvalue
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syscall 1 (r65535.b)
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}}
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}
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sub set_carry() {
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%ir {{
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sec
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}}
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}
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sub clear_carry() {
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%ir {{
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clc
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}}
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}
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sub set_irqd() {
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%ir {{
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sei
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}}
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}
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sub clear_irqd() {
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%ir {{
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cli
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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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sub save_prog8_internals() {
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; no-op
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}
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sub restore_prog8_internals() {
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; no-op
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}
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sub gfx_enable(ubyte mode) {
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%ir {{
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loadm.b r65535,sys.gfx_enable.mode
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syscall 8 (r65535.b)
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}}
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}
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sub gfx_clear(ubyte color) {
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%ir {{
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loadm.b r65535,sys.gfx_clear.color
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syscall 9 (r65535.b)
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}}
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}
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sub gfx_plot(uword xx, uword yy, ubyte color) {
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%ir {{
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loadm.w r65533,sys.gfx_plot.xx
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loadm.w r65534,sys.gfx_plot.yy
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loadm.b r65535,sys.gfx_plot.color
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syscall 10 (r65533.w, r65534.w, r65535.b)
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}}
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}
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sub gfx_getpixel(uword xx, uword yy) -> ubyte {
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%ir {{
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loadm.w r65534,sys.gfx_getpixel.xx
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loadm.w r65535,sys.gfx_getpixel.yy
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syscall 17 (r65534.w, r65535.w): r0.b
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returnr.b r0
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}}
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}
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sub push(ubyte b) {
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; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
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%ir {{
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loadm.b r65535,sys.push.b
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push.b r65535
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}}
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}
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sub pushw(uword w) {
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; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
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%ir {{
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loadm.w r65535,sys.pushw.w
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push.w r65535
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}}
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}
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sub pop() -> ubyte {
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; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
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%ir {{
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pop.b r65535
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returnr.b r65535
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}}
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}
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sub popw() -> uword {
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; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
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%ir {{
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pop.w r65535
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returnr.w r65535
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}}
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}
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sub read_flags() -> ubyte {
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; "simulate" the 6502 status register a little bit
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if_neg {
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if_z
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cx16.r0L = %10000010
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else
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cx16.r0L = %10000000
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}
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else {
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if_z
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cx16.r0L = %00000010
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else
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cx16.r0L = %00000000
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}
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if_cs
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cx16.r0L |= 1
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; TODO: overflow flag not yet supported
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; if_vs
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; cx16.r0L |= %01000000
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return cx16.r0L
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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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; they are simulated on the VirtualMachine as well but their location in memory is different
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&uword r0 = $ff02
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&uword r1 = $ff04
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&uword r2 = $ff06
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&uword r3 = $ff08
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&uword r4 = $ff0a
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&uword r5 = $ff0c
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&uword r6 = $ff0e
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&uword r7 = $ff10
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&uword r8 = $ff12
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&uword r9 = $ff14
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&uword r10 = $ff16
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&uword r11 = $ff18
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&uword r12 = $ff1a
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&uword r13 = $ff1c
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&uword r14 = $ff1e
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&uword r15 = $ff20
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&word r0s = $ff02
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&word r1s = $ff04
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&word r2s = $ff06
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&word r3s = $ff08
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&word r4s = $ff0a
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&word r5s = $ff0c
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&word r6s = $ff0e
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&word r7s = $ff10
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&word r8s = $ff12
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&word r9s = $ff14
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&word r10s = $ff16
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&word r11s = $ff18
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&word r12s = $ff1a
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&word r13s = $ff1c
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&word r14s = $ff1e
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&word r15s = $ff20
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&ubyte r0L = $ff02
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&ubyte r1L = $ff04
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&ubyte r2L = $ff06
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&ubyte r3L = $ff08
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&ubyte r4L = $ff0a
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&ubyte r5L = $ff0c
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&ubyte r6L = $ff0e
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&ubyte r7L = $ff10
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&ubyte r8L = $ff12
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&ubyte r9L = $ff14
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&ubyte r10L = $ff16
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&ubyte r11L = $ff18
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&ubyte r12L = $ff1a
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&ubyte r13L = $ff1c
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&ubyte r14L = $ff1e
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&ubyte r15L = $ff20
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&ubyte r0H = $ff03
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&ubyte r1H = $ff05
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&ubyte r2H = $ff07
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&ubyte r3H = $ff09
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&ubyte r4H = $ff0b
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&ubyte r5H = $ff0d
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&ubyte r6H = $ff0f
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&ubyte r7H = $ff11
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&ubyte r8H = $ff13
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&ubyte r9H = $ff15
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&ubyte r10H = $ff17
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&ubyte r11H = $ff19
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&ubyte r12H = $ff1b
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&ubyte r13H = $ff1d
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&ubyte r14H = $ff1f
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&ubyte r15H = $ff21
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&byte r0sL = $ff02
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&byte r1sL = $ff04
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&byte r2sL = $ff06
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&byte r3sL = $ff08
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&byte r4sL = $ff0a
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&byte r5sL = $ff0c
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&byte r6sL = $ff0e
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&byte r7sL = $ff10
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&byte r8sL = $ff12
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&byte r9sL = $ff14
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&byte r10sL = $ff16
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&byte r11sL = $ff18
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&byte r12sL = $ff1a
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&byte r13sL = $ff1c
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&byte r14sL = $ff1e
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&byte r15sL = $ff20
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&byte r0sH = $ff03
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&byte r1sH = $ff05
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&byte r2sH = $ff07
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&byte r3sH = $ff09
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&byte r4sH = $ff0b
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&byte r5sH = $ff0d
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&byte r6sH = $ff0f
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&byte r7sH = $ff11
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&byte r8sH = $ff13
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&byte r9sH = $ff15
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&byte r10sH = $ff17
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&byte r11sH = $ff19
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&byte r12sH = $ff1b
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&byte r13sH = $ff1d
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&byte r14sH = $ff1f
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&byte r15sH = $ff21
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sub save_virtual_registers() {
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uword[32] storage
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storage[0] = r0
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storage[1] = r1
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storage[2] = r2
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storage[3] = r3
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storage[4] = r4
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storage[5] = r5
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storage[6] = r6
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storage[7] = r7
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storage[8] = r8
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storage[9] = r9
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storage[10] = r10
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storage[11] = r11
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storage[12] = r12
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storage[13] = r13
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storage[14] = r14
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storage[15] = r15
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}
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sub restore_virtual_registers() {
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r0 = cx16.save_virtual_registers.storage[0]
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r1 = cx16.save_virtual_registers.storage[1]
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r2 = cx16.save_virtual_registers.storage[2]
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r3 = cx16.save_virtual_registers.storage[3]
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r4 = cx16.save_virtual_registers.storage[4]
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r5 = cx16.save_virtual_registers.storage[5]
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r6 = cx16.save_virtual_registers.storage[6]
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r7 = cx16.save_virtual_registers.storage[7]
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r8 = cx16.save_virtual_registers.storage[8]
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r9 = cx16.save_virtual_registers.storage[9]
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r10 = cx16.save_virtual_registers.storage[10]
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r11 = cx16.save_virtual_registers.storage[11]
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r12 = cx16.save_virtual_registers.storage[12]
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r13 = cx16.save_virtual_registers.storage[13]
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r14 = cx16.save_virtual_registers.storage[14]
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r15 = cx16.save_virtual_registers.storage[15]
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}
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}
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