uxn-utils/ref/uxnmin.c

159 lines
5.0 KiB
C

#include <stdio.h>
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), fflush(stdout); return;
case 0x19: fputc(uxn.dev[0x19], stderr), fflush(stderr); return;
}
}
/* Unroll */
#define OPC(opc, body) {\
case 0x00|opc: {enum{_2=0,_r=0}; s = &uxn.wst, sp = &uxn.wst.ptr; body break;}\
case 0x20|opc: {enum{_2=1,_r=0}; s = &uxn.wst, sp = &uxn.wst.ptr; body break;}\
case 0x40|opc: {enum{_2=0,_r=1}; s = &uxn.rst, sp = &uxn.rst.ptr; body break;}\
case 0x60|opc: {enum{_2=1,_r=1}; s = &uxn.rst, sp = &uxn.rst.ptr; body break;}\
case 0x80|opc: {enum{_2=0,_r=0}; s = &uxn.wst, kp = uxn.wst.ptr, sp = &kp; body break;}\
case 0xa0|opc: {enum{_2=1,_r=0}; s = &uxn.wst, kp = uxn.wst.ptr, sp = &kp; body break;}\
case 0xc0|opc: {enum{_2=0,_r=1}; s = &uxn.rst, kp = uxn.rst.ptr, sp = &kp; body break;}\
case 0xe0|opc: {enum{_2=1,_r=1}; s = &uxn.rst, kp = uxn.rst.ptr, sp = &kp; body break;}\
}
/* Microcode */
#define FLP { s = _r ? &uxn.wst : &uxn.rst; }
#define JMI { pc += uxn.ram[pc++] << 8 | uxn.ram[pc++]; }
#define JMP(x) { if(_2) pc = (x); else pc += (Sint8)(x); }
#define POx(o) { if(_2) { PO2(o) } else PO1(o) }
#define PO1(o) { o = s->dat[--*sp]; }
#define PO2(o) { o = s->dat[--*sp] | (s->dat[--*sp] << 8); }
#define PUx(y) { if(_2) { PU2(y) } else PU1(y) }
#define PU1(y) { s->dat[s->ptr++] = (y); }
#define PU2(y) { tt = (y); PU1(tt >> 8) PU1(tt) }
#define IMM(x, y) { uxn.x.dat[uxn.x.ptr++] = (y); }
#define DEI(p, o) { if(_2) { o = (emu_dei(p) << 8) | emu_dei(p + 1); } else o = emu_dei(p); }
#define DEO(p, y) { if(_2) { emu_deo(p, y >> 8), emu_deo(p + 1, y); } else emu_deo(p, y); }
#define PEK(o, x, r) { if(_2) { r = (x); o = uxn.ram[r++] << 8 | uxn.ram[r]; } else o = uxn.ram[(x)]; }
#define POK(x, y, r) { if(_2) { r = (x); uxn.ram[r++] = y >> 8, uxn.ram[r] = y; } else uxn.ram[(x)] = (y); }
int
uxn_eval(Uint16 pc)
{
int a,b,c;
Uint8 t, kp, *sp;
Uint16 tt;
Stack *s;
if(!pc || uxn.dev[0x0f]) return 0;
for(;;) {
switch(uxn.ram[pc++]) {
/* BRK */ case 0x00: return 1;
/* JCI */ case 0x20: if(uxn.wst.dat[--uxn.wst.ptr]) { JMI break; } pc += 2; break;
/* JMI */ case 0x40: JMI break;
/* JSI */ case 0x60: tt = pc + 2; IMM(rst, tt >> 8) IMM(rst, tt) JMI break;
/* LI2 */ case 0xa0: IMM(wst, uxn.ram[pc++])
/* LIT */ case 0x80: IMM(wst, uxn.ram[pc++]) break;
/* L2r */ case 0xe0: IMM(rst, uxn.ram[pc++])
/* LIr */ case 0xc0: IMM(rst, uxn.ram[pc++]) break;
/* INC */ OPC(0x01, POx(a) PUx(a + 1))
/* POP */ OPC(0x02, POx(a))
/* NIP */ OPC(0x03, POx(a) POx(b) PUx(a))
/* SWP */ OPC(0x04, POx(a) POx(b) PUx(a) PUx(b))
/* ROT */ OPC(0x05, POx(a) POx(b) POx(c) PUx(b) PUx(a) PUx(c))
/* DUP */ OPC(0x06, POx(a) PUx(a) PUx(a))
/* OVR */ OPC(0x07, POx(a) POx(b) PUx(b) PUx(a) PUx(b))
/* 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) FLP PU2(pc) JMP(a))
/* STH */ OPC(0x0f, POx(a) FLP PUx(a))
/* LDZ */ OPC(0x10, PO1(a) PEK(b, a, t) PUx(b))
/* STZ */ OPC(0x11, PO1(a) POx(b) POK(a, b, t))
/* LDR */ OPC(0x12, PO1(a) PEK(b, pc + (Sint8)a, tt) PUx(b))
/* STR */ OPC(0x13, PO1(a) POx(b) POK(pc + (Sint8)a, b, tt))
/* LDA */ OPC(0x14, PO2(a) PEK(b, a, tt) PUx(b))
/* STA */ OPC(0x15, PO2(a) POx(b) POK(a, b, tt))
/* DEI */ OPC(0x16, PO1(a) DEI(a, b) PUx(b))
/* DEO */ OPC(0x17, PO1(a) POx(b) DEO(a, b))
/* 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;
}