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https://github.com/sehugg/8bitworkshop.git
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assembler: added .string .data .align
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Steven Hugg
parent
f0591ef7c4
commit
09fb489c2d
@ -26,6 +26,7 @@
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{"fmt":"rts", "bits":["01001","111","00001","110"]},
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{"fmt":"jsr ~reg", "bits":["01110","111","00",0,"110"]},
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{"fmt":"jsr ~imm16", "bits":["0001110001011000",0,"0111011100100110"]},
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{"fmt":"jmp ~imm16", "bits":["0001111101011000",0]},
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{"fmt":"bcc ~rel8", "bits":["10000001",0]},
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{"fmt":"bcs ~rel8", "bits":["10001001",0]},
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151
presets/verilog/test2.asm
Normal file
151
presets/verilog/test2.asm
Normal file
@ -0,0 +1,151 @@
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.include "hvsync_generator.v"
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.include "font_cp437_8x8.v"
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.include "ram.v"
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.include "tile_renderer.v"
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.include "sprite_scanline_renderer.v"
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.include "lfsr.v"
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.include "sound_generator.v"
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.include "cpu16.v"
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.include "cpu_platform.v"
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.module cpu_platform
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.arch femto16
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.org 0x8000
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.len 1024
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jmp Start
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Start:
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mov sp,@$6fff
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mov fx,@InitPageTable
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jsr fx
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mov ax,@$1ffe
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mov fx,@ClearTiles
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; jsr ex
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mov fx,@DrawMaze
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jsr fx
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mov bx,@HelloWorld
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mov cx,@$1f00
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mov dx,@$6001
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mov fx,@WriteString
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jsr fx
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mov fx,@ClearSprites
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jsr fx
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reset
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WriteString:
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mov ax,[bx]
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bz StringDone
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xor ax,cx
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mov [dx],ax
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inc bx
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inc dx
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jmp WriteString
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StringDone:
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rts
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DrawMaze:
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mov dx,@$6040
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mov bx,@MazeData
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DrawMazeLoop:
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mov ax,[bx]
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inc bx
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mov fx,#4
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ShiftMazeChar:
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; rotate high 4 bits to low 4 bits
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asl ax
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rol ax
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rol ax
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rol ax
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mov ex,ax
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and ax,#7
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adc ax,ex
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; lookup character in table
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mov ex,ax
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and ex,#$f
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add ex,@MazeChars
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mov ex,[ex]
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or ex,@$1e00
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; store to video buffer
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mov [dx],ex
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inc dx
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dec fx
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bnz ShiftMazeChar
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mov ax,dx
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sub ax,@$6340
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bnz DrawMazeLoop
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rts
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InitPageTable:
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mov ax,@$6000 ; screen buffer
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mov bx,@$7e00 ; page table start
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mov cx,#32 ; 32 rows
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InitPTLoop:
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mov [bx],ax
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add ax,#32
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inc bx
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dec cx
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bnz InitPTLoop
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rts
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ClearTiles:
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mov bx,@$6000
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mov cx,@$3c0
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ClearLoop:
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mov [bx],ax
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inc bx
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dec cx
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bnz ClearLoop
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rts
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ClearSprites:
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mov bx,@$7f00
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mov ax,#0
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mov cx,#$40
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ClearSLoop:
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mov ax,[bx]
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add ax,@$101
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mov [bx],ax
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inc bx
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dec cx
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bnz ClearSLoop
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HelloWorld:
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.string HELLO WORLD
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.data 0
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MazeData:
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.data $3111 $1111 $1111 $1114 $3111 $1111 $1111 $1114
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.data $2000 $0000 $0000 $0002 $2000 $0000 $0000 $0002
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.data $2031 $1114 $0311 $1402 $2031 $1140 $0311 $1402
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.data $2051 $1116 $0511 $1605 $6051 $1160 $0511 $1602
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.data $2000 $0000 $0000 $0000 $0000 $0000 $0000 $0002
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.data $2031 $1114 $0340 $3111 $1114 $0340 $0311 $1402
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.data $2051 $1116 $0220 $5114 $3116 $0220 $0511 $1602
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.data $2000 $0000 $0220 $0002 $2000 $0220 $0000 $0002
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.data $5111 $1114 $0251 $1402 $2031 $1620 $3111 $1116
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.data $3111 $1116 $0231 $1605 $6051 $1420 $5111 $1114
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.data $2000 $0000 $0220 $0000 $0000 $0220 $0000 $0002
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.data $2031 $1114 $0220 $3111 $1114 $0220 $0311 $1402
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.data $2051 $1116 $0560 $2ccc $ccc2 $0560 $0511 $1602
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.data $2000 $0000 $0000 $2ccc $ccc2 $0000 $0000 $0002
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.data $5111 $1114 $0340 $2ccc $ccc2 $0340 $0311 $1116
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.data $3111 $1116 $0220 $5111 $1116 $0220 $0511 $1114
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.data $2000 $0000 $0220 $0000 $0000 $0220 $0000 $0002
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.data $2031 $1114 $0251 $1403 $4031 $1620 $0311 $1402
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.data $2051 $1116 $0511 $1605 $6051 $1160 $0511 $1602
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.data $2000 $0000 $0000 $0000 $0000 $0000 $0000 $0002
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.data $2031 $1114 $0311 $1403 $4031 $1140 $0311 $1402
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.data $2051 $1116 $0511 $1602 $2051 $1160 $0511 $1602
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.data $2000 $0000 $0000 $0002 $2000 $0000 $0000 $0002
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.data $5111 $1111 $1111 $1116 $5111 $1111 $1111 $1116
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MazeChars:
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.data $f9 ; empty
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.data $c4 $b3 ; horizvert
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.data $da $bf $c0 $d9 ; corners
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.data $c3 $c1 $c2 $b4 ; 3-way
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.data $c5 ; 4-way
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.data $20 ; empty (no dot)
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.data 123 $123
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.align $10
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@ -110,6 +110,39 @@ var Assembler = function(spec) {
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outwords[ip++ - origin] = (op >> (nb-1-i)*width) & ((1<<width)-1);
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}
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}
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function addWords(data) {
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asmlines.push({
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line:linenum,
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offset:ip,
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nbits:width*data.length
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});
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for (var i=0; i<data.length; i++) {
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outwords[ip++ - origin] = data[i];
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}
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}
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function parseData(toks) {
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var data = [];
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for (var i=0; i<toks.length; i++) {
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data[i] = parseConst(toks[i]);
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}
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return data;
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}
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function stringToData(s) {
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var data = [];
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for (var i=0; i<s.length; i++) {
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data[i] = s.charCodeAt(i);
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}
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return data;
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}
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function alignIP(align) {
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if (align < 1 || align > codelen)
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fatal("Invalid alignment value");
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else
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ip = Math.floor((ip+align-1)/align)*align;
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}
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function parseConst(s, nbits) {
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// TODO: check bit length
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@ -184,20 +217,27 @@ var Assembler = function(spec) {
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}
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function parseDirective(tokens) {
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if (tokens[0] == '.define')
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symbols[tokens[1]] = {value:tokens[2]};
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else if (tokens[0] == '.org')
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var cmd = tokens[0].toLowerCase();
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if (cmd == '.define')
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symbols[tokens[1].toLowerCase()] = {value:tokens[2]};
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else if (cmd == '.org')
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ip = origin = parseInt(tokens[1]);
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else if (tokens[0] == '.len')
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else if (cmd == '.len')
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codelen = parseInt(tokens[1]);
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else if (tokens[0] == '.width')
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else if (cmd == '.width')
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width = parseInt(tokens[1]);
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else if (tokens[0] == '.arch')
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else if (cmd == '.arch')
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fatalIf(self.loadArch(tokens[1]));
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else if (tokens[0] == '.include')
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else if (cmd == '.include')
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fatalIf(self.loadInclude(tokens[1]));
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else if (tokens[0] == '.module')
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else if (cmd == '.module')
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fatalIf(self.loadModule(tokens[1]));
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else if (cmd == '.data')
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addWords(parseData(tokens.slice(1)));
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else if (cmd == '.string')
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addWords(stringToData(tokens.slice(1).join(' ')));
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else if (cmd == '.align')
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alignIP(parseConst(tokens[1]));
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else
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warning("Unrecognized directive: " + tokens);
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}
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@ -205,14 +245,15 @@ var Assembler = function(spec) {
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self.assemble = function(line) {
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linenum++;
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// remove comments
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line = line.replace(/[;].*/g, '');
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line = line.trim().toLowerCase();
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line = line.replace(/[;].*/g, '').trim();
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// is it a directive?
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if (line[0] == '.') {
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var tokens = line.split(/\s+/);
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parseDirective(tokens);
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return;
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}
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// make it lowercase
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line = line.toLowerCase();
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// find labels
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line = line.replace(/(\w+):/, function(_label, label) {
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symbols[label] = {value:ip};
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@ -282,7 +323,12 @@ var Assembler = function(spec) {
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self.assembleFile = function(text) {
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var lines = text.split(/\n/g);
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for (var i=0; i<lines.length && !aborted; i++) {
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self.assemble(lines[i]);
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try {
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self.assemble(lines[i]);
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} catch (e) {
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console.log(e);
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fatal("Exception during assembly: " + e);
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}
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}
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return self.finish();
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}
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