159 lines
4.9 KiB
C
159 lines
4.9 KiB
C
#include <stdio.h>
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typedef unsigned char Uint8;
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typedef signed char Sint8;
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typedef unsigned short Uint16;
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typedef struct {
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Uint8 dat[0x100], ptr;
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} Stack;
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typedef struct Uxn {
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Uint8 ram[0x10000], dev[0x100];
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Stack wst, rst;
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} Uxn;
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Uxn uxn;
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/* I/O */
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Uint8
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emu_dei(Uint8 addr)
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{
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return uxn.dev[addr];
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}
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void
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emu_deo(Uint8 addr, Uint8 value)
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{
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uxn.dev[addr] = value;
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switch(addr) {
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case 0x18: fputc(uxn.dev[0x18], stdout); return;
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case 0x19: fputc(uxn.dev[0x19], stderr); return;
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}
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}
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/* Unroll */
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#define OPC(opc, init, body) {\
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case 0x00|opc: {enum{_2=0,_r=0};init body;} break;\
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case 0x20|opc: {enum{_2=1,_r=0};init body;} break;\
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case 0x40|opc: {enum{_2=0,_r=1};init body;} break;\
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case 0x60|opc: {enum{_2=1,_r=1};init body;} break;\
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case 0x80|opc: {enum{_2=0,_r=0};int k=uxn.wst.ptr;init uxn.wst.ptr= k;body;} break;\
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case 0xa0|opc: {enum{_2=1,_r=0};int k=uxn.wst.ptr;init uxn.wst.ptr= k;body;} break;\
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case 0xc0|opc: {enum{_2=0,_r=1};int k=uxn.rst.ptr;init uxn.rst.ptr= k;body;} break;\
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case 0xe0|opc: {enum{_2=1,_r=1};int k=uxn.rst.ptr;init uxn.rst.ptr= k;body;} break;\
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}
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/* Microcode */
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#define JMI pc += uxn.ram[pc++] << 8 | uxn.ram[pc++];
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#define JMP(i) if(_2) pc = i; else pc += (Sint8)i;
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#define REM if(_r) uxn.rst.ptr -= 1 + _2; else uxn.wst.ptr -= 1 + _2;
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#define INC(s) uxn.s.dat[uxn.s.ptr++]
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#define DEC(s) uxn.s.dat[--uxn.s.ptr]
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#define POx(o) if(_2) { PO2(o) } else PO1(o)
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#define PO1(o) o = _r ? DEC(rst) : DEC(wst);
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#define PO2(o) PO1(o) o |= (_r ? DEC(rst) : DEC(wst)) << 8;
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#define PUx(i) if(_2) { c = (i); PU1(c >> 8) PU1(c) } else PU1(i)
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#define PU1(i) if(_r) INC(rst) = i; else INC(wst) = i;
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#define RP1(i) if(_r) INC(wst) = i; else INC(rst) = i;
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#define GET(o) if(_2) PO1(o[1]) PO1(o[0])
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#define PUT(i) PU1(i[0]) if(_2) PU1(i[1])
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#define DEI(i,o) o[0] = emu_dei(i); if(_2) o[1] = emu_dei(i + 1); PUT(o)
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#define DEO(i,j) emu_deo(i, j[0]); if(_2) emu_deo(i + 1, j[1]);
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#define PEK(i,o,m) o[0] = uxn.ram[i]; if(_2) o[1] = uxn.ram[(i + 1) & m]; PUT(o)
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#define POK(i,j,m) uxn.ram[i] = j[0]; if(_2) uxn.ram[(i + 1) & m] = j[1];
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int
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uxn_eval(Uint16 pc)
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{
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int a, b, c, x[2], y[2], z[2];
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if(!pc || uxn.dev[0x0f]) return 0;
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for(;;) {
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switch(uxn.ram[pc++]) {
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/* BRK */ case 0x00: return 1;
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/* JCI */ case 0x20: if(DEC(wst)) { JMI break; } pc += 2; break;
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/* JMI */ case 0x40: JMI break;
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/* JSI */ case 0x60: c = pc + 2; INC(rst) = c >> 8; INC(rst) = c; JMI break;
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/* LI2 */ case 0xa0: INC(wst) = uxn.ram[pc++];
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/* LIT */ case 0x80: INC(wst) = uxn.ram[pc++]; break;
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/* L2r */ case 0xe0: INC(rst) = uxn.ram[pc++];
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/* LIr */ case 0xc0: INC(rst) = uxn.ram[pc++]; break;
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/* INC */ OPC(0x01, POx(a), PUx(a + 1))
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/* POP */ OPC(0x02, REM, 0)
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/* NIP */ OPC(0x03, GET(x) REM,PUT(x))
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/* SWP */ OPC(0x04, GET(x) GET(y),PUT(x) PUT(y))
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/* ROT */ OPC(0x05, GET(x) GET(y) GET(z),PUT(y) PUT(x) PUT(z))
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/* DUP */ OPC(0x06, GET(x),PUT(x) PUT(x))
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/* OVR */ OPC(0x07, GET(x) GET(y),PUT(y) PUT(x) PUT(y))
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/* EQU */ OPC(0x08, POx(a) POx(b),PU1(b == a))
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/* NEQ */ OPC(0x09, POx(a) POx(b),PU1(b != a))
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/* GTH */ OPC(0x0a, POx(a) POx(b),PU1(b > a))
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/* LTH */ OPC(0x0b, POx(a) POx(b),PU1(b < a))
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/* JMP */ OPC(0x0c, POx(a),JMP(a))
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/* JCN */ OPC(0x0d, POx(a) PO1(b), if(b) JMP(a))
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/* JSR */ OPC(0x0e, POx(a),RP1(pc >> 8) RP1(pc) JMP(a))
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/* STH */ OPC(0x0f, GET(x),RP1(x[0]) if(_2) RP1(x[1]))
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/* LDZ */ OPC(0x10, PO1(a),PEK(a, x, 0xff))
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/* STZ */ OPC(0x11, PO1(a) GET(y),POK(a, y, 0xff))
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/* LDR */ OPC(0x12, PO1(a),PEK(pc + (Sint8)a, x, 0xffff))
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/* STR */ OPC(0x13, PO1(a) GET(y),POK(pc + (Sint8)a, y, 0xffff))
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/* LDA */ OPC(0x14, PO2(a),PEK(a, x, 0xffff))
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/* STA */ OPC(0x15, PO2(a) GET(y),POK(a, y, 0xffff))
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/* DEI */ OPC(0x16, PO1(a),DEI(a, x))
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/* DEO */ OPC(0x17, PO1(a) GET(y),DEO(a, y))
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/* ADD */ OPC(0x18, POx(a) POx(b),PUx(b + a))
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/* SUB */ OPC(0x19, POx(a) POx(b),PUx(b - a))
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/* MUL */ OPC(0x1a, POx(a) POx(b),PUx(b * a))
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/* DIV */ OPC(0x1b, POx(a) POx(b),PUx(a ? b / a : 0))
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/* AND */ OPC(0x1c, POx(a) POx(b),PUx(b & a))
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/* ORA */ OPC(0x1d, POx(a) POx(b),PUx(b | a))
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/* EOR */ OPC(0x1e, POx(a) POx(b),PUx(b ^ a))
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/* SFT */ OPC(0x1f, PO1(a) POx(b),PUx(b >> (a & 0xf) << (a >> 4)))
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}
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}
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}
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void
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console_input(char c, int type)
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{
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uxn.dev[0x12] = c, uxn.dev[0x17] = type;
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uxn_eval(uxn.dev[0x10] << 8 | uxn.dev[0x11]);
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}
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int
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main(int argc, char **argv)
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{
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FILE *f;
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int i = 1;
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if(argc < 2) {
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fprintf(stdout, "usage: %s file.rom [args..]\n", argv[0]);
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return 0;
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}
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f = fopen(argv[i++], "rb");
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if(!f) {
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fprintf(stderr, "uxnmin: Error %s\n", argv[1]);
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return 0;
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}
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uxn.dev[0x17] = argc - i;
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fread(&uxn.ram[0x0100], 0xff00, 1, f), fclose(f);
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if(uxn_eval(0x0100) && (uxn.dev[0x10] << 8 | uxn.dev[0x11])) {
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for(; i < argc; i++) {
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char *p = argv[i];
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while(*p) console_input(*p++, 0x2);
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console_input('\n', i == argc - 1 ? 0x4 : 0x3);
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}
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while(!uxn.dev[0x0f]) {
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int c = fgetc(stdin);
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if(c == EOF) {
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console_input(0x00, 0x4);
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break;
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}
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console_input((Uint8)c, 0x1);
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}
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}
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return uxn.dev[0x0f] & 0x7f;
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}
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