mirror of
https://github.com/irmen/prog8.git
synced 2024-12-29 19:31:40 +00:00
350 lines
8.7 KiB
Lua
350 lines
8.7 KiB
Lua
; Prog8 definitions for the Virtual Machine
|
|
|
|
%option ignore_unused
|
|
|
|
sys {
|
|
; ------- lowlevel system routines --------
|
|
|
|
const ubyte target = 255 ; compilation target specifier. 64 = C64, 128 = C128, 16 = CommanderX16, 8 = atari800XL, 255 = virtual
|
|
|
|
sub reset_system() {
|
|
; Soft-reset the system back to initial power-on Basic prompt.
|
|
%ir {{
|
|
syscall 0 ()
|
|
}}
|
|
}
|
|
|
|
sub wait(uword jiffies) {
|
|
; --- wait approximately the given number of jiffies (1/60th seconds)
|
|
%ir {{
|
|
loadm.w r65535,sys.wait.jiffies
|
|
syscall 13 (r65535.w)
|
|
}}
|
|
}
|
|
|
|
sub waitvsync() {
|
|
; --- busy wait till the next vsync has occurred (approximately), without depending on custom irq handling.
|
|
%ir {{
|
|
syscall 14()
|
|
}}
|
|
}
|
|
|
|
sub internal_stringcopy(uword source, uword tgt) {
|
|
; Called when the compiler wants to assign a string value to another string.
|
|
%ir {{
|
|
loadm.w r65534,sys.internal_stringcopy.source
|
|
loadm.w r65535,sys.internal_stringcopy.tgt
|
|
syscall 39 (r65534.w, r65535.w): r0.b
|
|
}}
|
|
}
|
|
|
|
sub memcopy(uword source, uword tgt, uword count) {
|
|
%ir {{
|
|
loadm.w r65533,sys.memcopy.source
|
|
loadm.w r65534,sys.memcopy.tgt
|
|
loadm.w r65535,sys.memcopy.count
|
|
syscall 36 (r65533.w, r65534.w, r65535.w)
|
|
}}
|
|
}
|
|
|
|
sub memset(uword mem, uword numbytes, ubyte value) {
|
|
%ir {{
|
|
loadm.w r65533,sys.memset.mem
|
|
loadm.w r65534,sys.memset.numbytes
|
|
loadm.b r65535,sys.memset.value
|
|
syscall 37 (r65533.w, r65534.w, r65535.b)
|
|
}}
|
|
}
|
|
|
|
sub memsetw(uword mem, uword numwords, uword value) {
|
|
%ir {{
|
|
loadm.w r65533,sys.memsetw.mem
|
|
loadm.w r65534,sys.memsetw.numwords
|
|
loadm.w r65535,sys.memsetw.value
|
|
syscall 38 (r65533.w, r65534.w, r65535.w)
|
|
}}
|
|
}
|
|
|
|
sub exit(ubyte returnvalue) {
|
|
; -- immediately exit the program with a return code in the A register
|
|
%ir {{
|
|
loadm.b r65535,sys.exit.returnvalue
|
|
syscall 1 (r65535.b)
|
|
}}
|
|
}
|
|
|
|
sub set_carry() {
|
|
%ir {{
|
|
sec
|
|
}}
|
|
}
|
|
|
|
sub clear_carry() {
|
|
%ir {{
|
|
clc
|
|
}}
|
|
}
|
|
|
|
sub set_irqd() {
|
|
%ir {{
|
|
sei
|
|
}}
|
|
}
|
|
|
|
sub clear_irqd() {
|
|
%ir {{
|
|
cli
|
|
}}
|
|
}
|
|
|
|
sub disable_caseswitch() {
|
|
; no-op
|
|
}
|
|
|
|
sub enable_caseswitch() {
|
|
; no-op
|
|
}
|
|
|
|
sub save_prog8_internals() {
|
|
; no-op
|
|
}
|
|
|
|
sub restore_prog8_internals() {
|
|
; no-op
|
|
}
|
|
|
|
sub gfx_enable(ubyte mode) {
|
|
%ir {{
|
|
loadm.b r65535,sys.gfx_enable.mode
|
|
syscall 8 (r65535.b)
|
|
}}
|
|
}
|
|
|
|
sub gfx_clear(ubyte color) {
|
|
%ir {{
|
|
loadm.b r65535,sys.gfx_clear.color
|
|
syscall 9 (r65535.b)
|
|
}}
|
|
}
|
|
|
|
sub gfx_plot(uword xx, uword yy, ubyte color) {
|
|
%ir {{
|
|
loadm.w r65533,sys.gfx_plot.xx
|
|
loadm.w r65534,sys.gfx_plot.yy
|
|
loadm.b r65535,sys.gfx_plot.color
|
|
syscall 10 (r65533.w, r65534.w, r65535.b)
|
|
}}
|
|
}
|
|
|
|
sub gfx_getpixel(uword xx, uword yy) -> ubyte {
|
|
%ir {{
|
|
loadm.w r65534,sys.gfx_getpixel.xx
|
|
loadm.w r65535,sys.gfx_getpixel.yy
|
|
syscall 17 (r65534.w, r65535.w): r0.b
|
|
returnr.b r0
|
|
}}
|
|
}
|
|
|
|
sub push(ubyte b) {
|
|
; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
|
|
%ir {{
|
|
loadm.b r65535,sys.push.b
|
|
push.b r65535
|
|
}}
|
|
}
|
|
|
|
sub pushw(uword w) {
|
|
; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
|
|
%ir {{
|
|
loadm.w r65535,sys.pushw.w
|
|
push.w r65535
|
|
}}
|
|
}
|
|
|
|
sub pop() -> ubyte {
|
|
; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
|
|
%ir {{
|
|
pop.b r65535
|
|
returnr.b r65535
|
|
}}
|
|
}
|
|
|
|
sub popw() -> uword {
|
|
; note: this *should* be inlined, however since the VM has separate program counter and value stacks, this also works
|
|
%ir {{
|
|
pop.w r65535
|
|
returnr.w r65535
|
|
}}
|
|
}
|
|
|
|
sub read_flags() -> ubyte {
|
|
; "simulate" the 6502 status register a little bit
|
|
if_neg {
|
|
if_z
|
|
cx16.r0L = %10000010
|
|
else
|
|
cx16.r0L = %10000000
|
|
}
|
|
else {
|
|
if_z
|
|
cx16.r0L = %00000010
|
|
else
|
|
cx16.r0L = %00000000
|
|
}
|
|
|
|
if_cs
|
|
cx16.r0L |= 1
|
|
; TODO: overflow flag not yet supported
|
|
; if_vs
|
|
; cx16.r0L |= %01000000
|
|
|
|
return cx16.r0L
|
|
}
|
|
}
|
|
|
|
cx16 {
|
|
|
|
; the sixteen virtual 16-bit registers that the CX16 has defined in the zeropage
|
|
; they are simulated on the VirtualMachine as well but their location in memory is different
|
|
&uword r0 = $ff02
|
|
&uword r1 = $ff04
|
|
&uword r2 = $ff06
|
|
&uword r3 = $ff08
|
|
&uword r4 = $ff0a
|
|
&uword r5 = $ff0c
|
|
&uword r6 = $ff0e
|
|
&uword r7 = $ff10
|
|
&uword r8 = $ff12
|
|
&uword r9 = $ff14
|
|
&uword r10 = $ff16
|
|
&uword r11 = $ff18
|
|
&uword r12 = $ff1a
|
|
&uword r13 = $ff1c
|
|
&uword r14 = $ff1e
|
|
&uword r15 = $ff20
|
|
|
|
&word r0s = $ff02
|
|
&word r1s = $ff04
|
|
&word r2s = $ff06
|
|
&word r3s = $ff08
|
|
&word r4s = $ff0a
|
|
&word r5s = $ff0c
|
|
&word r6s = $ff0e
|
|
&word r7s = $ff10
|
|
&word r8s = $ff12
|
|
&word r9s = $ff14
|
|
&word r10s = $ff16
|
|
&word r11s = $ff18
|
|
&word r12s = $ff1a
|
|
&word r13s = $ff1c
|
|
&word r14s = $ff1e
|
|
&word r15s = $ff20
|
|
|
|
&ubyte r0L = $ff02
|
|
&ubyte r1L = $ff04
|
|
&ubyte r2L = $ff06
|
|
&ubyte r3L = $ff08
|
|
&ubyte r4L = $ff0a
|
|
&ubyte r5L = $ff0c
|
|
&ubyte r6L = $ff0e
|
|
&ubyte r7L = $ff10
|
|
&ubyte r8L = $ff12
|
|
&ubyte r9L = $ff14
|
|
&ubyte r10L = $ff16
|
|
&ubyte r11L = $ff18
|
|
&ubyte r12L = $ff1a
|
|
&ubyte r13L = $ff1c
|
|
&ubyte r14L = $ff1e
|
|
&ubyte r15L = $ff20
|
|
|
|
&ubyte r0H = $ff03
|
|
&ubyte r1H = $ff05
|
|
&ubyte r2H = $ff07
|
|
&ubyte r3H = $ff09
|
|
&ubyte r4H = $ff0b
|
|
&ubyte r5H = $ff0d
|
|
&ubyte r6H = $ff0f
|
|
&ubyte r7H = $ff11
|
|
&ubyte r8H = $ff13
|
|
&ubyte r9H = $ff15
|
|
&ubyte r10H = $ff17
|
|
&ubyte r11H = $ff19
|
|
&ubyte r12H = $ff1b
|
|
&ubyte r13H = $ff1d
|
|
&ubyte r14H = $ff1f
|
|
&ubyte r15H = $ff21
|
|
|
|
&byte r0sL = $ff02
|
|
&byte r1sL = $ff04
|
|
&byte r2sL = $ff06
|
|
&byte r3sL = $ff08
|
|
&byte r4sL = $ff0a
|
|
&byte r5sL = $ff0c
|
|
&byte r6sL = $ff0e
|
|
&byte r7sL = $ff10
|
|
&byte r8sL = $ff12
|
|
&byte r9sL = $ff14
|
|
&byte r10sL = $ff16
|
|
&byte r11sL = $ff18
|
|
&byte r12sL = $ff1a
|
|
&byte r13sL = $ff1c
|
|
&byte r14sL = $ff1e
|
|
&byte r15sL = $ff20
|
|
|
|
&byte r0sH = $ff03
|
|
&byte r1sH = $ff05
|
|
&byte r2sH = $ff07
|
|
&byte r3sH = $ff09
|
|
&byte r4sH = $ff0b
|
|
&byte r5sH = $ff0d
|
|
&byte r6sH = $ff0f
|
|
&byte r7sH = $ff11
|
|
&byte r8sH = $ff13
|
|
&byte r9sH = $ff15
|
|
&byte r10sH = $ff17
|
|
&byte r11sH = $ff19
|
|
&byte r12sH = $ff1b
|
|
&byte r13sH = $ff1d
|
|
&byte r14sH = $ff1f
|
|
&byte r15sH = $ff21
|
|
|
|
sub save_virtual_registers() {
|
|
uword[32] storage
|
|
storage[0] = r0
|
|
storage[1] = r1
|
|
storage[2] = r2
|
|
storage[3] = r3
|
|
storage[4] = r4
|
|
storage[5] = r5
|
|
storage[6] = r6
|
|
storage[7] = r7
|
|
storage[8] = r8
|
|
storage[9] = r9
|
|
storage[10] = r10
|
|
storage[11] = r11
|
|
storage[12] = r12
|
|
storage[13] = r13
|
|
storage[14] = r14
|
|
storage[15] = r15
|
|
}
|
|
|
|
sub restore_virtual_registers() {
|
|
r0 = cx16.save_virtual_registers.storage[0]
|
|
r1 = cx16.save_virtual_registers.storage[1]
|
|
r2 = cx16.save_virtual_registers.storage[2]
|
|
r3 = cx16.save_virtual_registers.storage[3]
|
|
r4 = cx16.save_virtual_registers.storage[4]
|
|
r5 = cx16.save_virtual_registers.storage[5]
|
|
r6 = cx16.save_virtual_registers.storage[6]
|
|
r7 = cx16.save_virtual_registers.storage[7]
|
|
r8 = cx16.save_virtual_registers.storage[8]
|
|
r9 = cx16.save_virtual_registers.storage[9]
|
|
r10 = cx16.save_virtual_registers.storage[10]
|
|
r11 = cx16.save_virtual_registers.storage[11]
|
|
r12 = cx16.save_virtual_registers.storage[12]
|
|
r13 = cx16.save_virtual_registers.storage[13]
|
|
r14 = cx16.save_virtual_registers.storage[14]
|
|
r15 = cx16.save_virtual_registers.storage[15]
|
|
}
|
|
}
|