#include typedef unsigned char Uint8; typedef signed char Sint8; typedef unsigned short Uint16; typedef struct { Uint8 dat[0x100], ptr; } Stack; typedef struct Uxn { Uint8 ram[0x10000], dev[0x100]; Stack wst, rst; } Uxn; Uxn uxn; /* I/O */ Uint8 emu_dei(Uint8 addr) { return uxn.dev[addr]; } void emu_deo(Uint8 addr, Uint8 value) { uxn.dev[addr] = value; switch(addr) { case 0x18: fputc(uxn.dev[0x18], stdout); return; case 0x19: fputc(uxn.dev[0x19], stderr); return; } } /* Unroll */ #define OPC(opc, init, body) {\ case 0x00|opc: {enum{_2=0,_r=0};init;body;} break;\ case 0x20|opc: {enum{_2=1,_r=0};init;body;} break;\ case 0x40|opc: {enum{_2=0,_r=1};init;body;} break;\ case 0x60|opc: {enum{_2=1,_r=1};init;body;} break;\ case 0x80|opc: {enum{_2=0,_r=0};k=uxn.wst.ptr;init;uxn.wst.ptr= k;body;} break;\ case 0xa0|opc: {enum{_2=1,_r=0};k=uxn.wst.ptr;init;uxn.wst.ptr= k;body;} break;\ case 0xc0|opc: {enum{_2=0,_r=1};k=uxn.rst.ptr;init;uxn.rst.ptr= k;body;} break;\ case 0xe0|opc: {enum{_2=1,_r=1};k=uxn.rst.ptr;init;uxn.rst.ptr= k;body;} break;\ } /* Microcode */ #define JMI pc += uxn.ram[pc++] << 8 | uxn.ram[pc++]; #define JMP(j) if(_2) pc = (j); else pc += (Sint8)(j); #define INC(s) uxn.s.dat[uxn.s.ptr++] #define DEC(s) uxn.s.dat[--uxn.s.ptr] #define POx(o) if(_2) { PO2(o) } else PO1(o) #define PO2(o) if(_r) o = DEC(rst) | (DEC(rst) << 8); else o = DEC(wst) | (DEC(wst) << 8); #define PO1(o) if(_r) o = DEC(rst); else o = DEC(wst); #define PUx(y) if(_2) { PU2(y) } else PU1(y) #define PU2(y) tt = (y); PU1(tt >> 8) PU1(tt) #define PU1(y) if(_r) INC(rst) = y; else INC(wst) = y; #define PUR(y) if(_r) INC(wst) = y; else INC(rst) = y; #define GET(o,p) if(_2) PO1(p) PO1(o) #define PUT(y,z) PU1(y) if(_2) PU1(z) #define DEI(i,o,p) o =emu_dei(i); if(_2) p =emu_dei(i + 1); #define DEO(i,y,z) emu_deo(i, y); if(_2) emu_deo(i + 1, z); #define PEK(i,o,p,r) o = uxn.ram[i]; if(_2) r = i + 1, p = uxn.ram[r]; #define POK(i,y,z,r) uxn.ram[i] = y; if(_2) r = i + 1, uxn.ram[r] = z; int uxn_eval(Uint16 pc) { int a,b,c,d,e,f,k; Uint8 t; Uint16 tt; if(!pc || uxn.dev[0x0f]) return 0; for(;;) { switch(uxn.ram[pc++]) { /* BRK */ case 0x00: return 1; /* JCI */ case 0x20: if(DEC(wst)) { JMI break; } pc += 2; break; /* JMI */ case 0x40: JMI break; /* JSI */ case 0x60: tt = pc + 2; INC(rst) = tt >> 8; INC(rst) = tt; JMI break; /* LI2 */ case 0xa0: INC(wst) = uxn.ram[pc++]; /* LIT */ case 0x80: INC(wst) = uxn.ram[pc++]; break; /* L2r */ case 0xe0: INC(rst) = uxn.ram[pc++]; /* LIr */ case 0xc0: INC(rst) = uxn.ram[pc++]; break; /* INC */ OPC(0x01, POx(a),PUx(a + 1)) /* POP */ OPC(0x02, GET(a,b),0) /* NIP */ OPC(0x03, GET(a,b) GET(c,d),PUT(a,b)) /* SWP */ OPC(0x04, GET(a,b) GET(c,d),PUT(a,b) PUT(c,d)) /* ROT */ OPC(0x05, GET(a,b) GET(c,d) GET(e,f),PUT(c,d) PUT(a,b) PUT(e,f)) /* DUP */ OPC(0x06, GET(a,b),PUT(a,b) PUT(a,b)) /* OVR */ OPC(0x07, GET(a,b) GET(c,d),PUT(c,d) PUT(a,b) PUT(c,d)) /* EQU */ OPC(0x08, POx(a) POx(b),PU1(b == a)) /* NEQ */ OPC(0x09, POx(a) POx(b),PU1(b != a)) /* GTH */ OPC(0x0a, POx(a) POx(b),PU1(b > a)) /* LTH */ OPC(0x0b, POx(a) POx(b),PU1(b < a)) /* JMP */ OPC(0x0c, POx(a),JMP(a)) /* JCN */ OPC(0x0d, POx(a) PO1(b), if(b) JMP(a)) /* JSR */ OPC(0x0e, POx(a),PUR(pc >> 8) PUR(pc) JMP(a)) /* STH */ OPC(0x0f, GET(a,b),PUR(a) if(_2) PUR(b)) /* LDZ */ OPC(0x10, PO1(a),PEK(a,b,c,t) PUT(b,c)) /* STZ */ OPC(0x11, PO1(a) GET(b,c),POK(a,b,c,t)) /* LDR */ OPC(0x12, PO1(a),PEK(pc+(Sint8)a,b,c,tt) PUT(b,c)) /* STR */ OPC(0x13, PO1(a) GET(b,c),POK(pc+(Sint8)a,b,c,tt)) /* LDA */ OPC(0x14, PO2(a),PEK(a,b,c,tt) PUT(b,c)) /* STA */ OPC(0x15, PO2(a) GET(b,c),POK(a,b,c,tt)) /* DEI */ OPC(0x16, PO1(a),DEI(a,b,c) PUT(b,c)) /* DEO */ OPC(0x17, PO1(a) GET(b,c),DEO(a,b,c)) /* ADD */ OPC(0x18, POx(a) POx(b),PUx(b + a)) /* SUB */ OPC(0x19, POx(a) POx(b),PUx(b - a)) /* MUL */ OPC(0x1a, POx(a) POx(b),PUx(b * a)) /* DIV */ OPC(0x1b, POx(a) POx(b),PUx(a ? b / a : 0)) /* AND */ OPC(0x1c, POx(a) POx(b),PUx(b & a)) /* ORA */ OPC(0x1d, POx(a) POx(b),PUx(b | a)) /* EOR */ OPC(0x1e, POx(a) POx(b),PUx(b ^ a)) /* SFT */ OPC(0x1f, PO1(a) POx(b),PUx(b >> (a & 0xf) << (a >> 4))) } } } void console_input(char c, int type) { uxn.dev[0x12] = c, uxn.dev[0x17] = type; uxn_eval(uxn.dev[0x10] << 8 | uxn.dev[0x11]); } int main(int argc, char **argv) { FILE *f; int i = 1; if(argc < 2) { fprintf(stdout, "usage: %s file.rom [args..]\n", argv[0]); return 0; } f = fopen(argv[i++], "rb"); if(!f) { fprintf(stderr, "uxnmin: Error %s\n", argv[1]); return 0; } uxn.dev[0x17] = argc - i; fread(&uxn.ram[0x0100], 0xff00, 1, f), fclose(f); if(uxn_eval(0x0100) && (uxn.dev[0x10] << 8 | uxn.dev[0x11])) { for(; i < argc; i++) { char *p = argv[i]; while(*p) console_input(*p++, 0x2); console_input('\n', i == argc - 1 ? 0x4 : 0x3); } while(!uxn.dev[0x0f]) { int c = fgetc(stdin); if(c == EOF) { console_input(0x00, 0x4); break; } console_input((Uint8)c, 0x1); } } return uxn.dev[0x0f] & 0x7f; }