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Call opcodes are now relative

This commit is contained in:
Devine Lu Linvega 2023-01-12 09:34:45 -08:00
parent 18ff8550c7
commit 256b7cafce
2 changed files with 31 additions and 34 deletions
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23
src/uxn.c
View File

@ -33,10 +33,11 @@ int
uxn_eval(Uxn *u, Uint16 pc)
{
Uint8 kptr, *sp;
Uint16 a, b, c, j, k, bs, instr;
Uint16 a, b, c, j, k, bs, instr, opcode;
Stack *src, *dst;
if(!pc || u->dev[0x0f]) return 0;
while((instr = u->ram[pc++])) {
for(;;) {
instr = u->ram[pc++];
/* Return Mode */
if(instr & 0x40) { src = u->rst; dst = u->wst; }
else { src = u->wst; dst = u->rst; }
@ -45,14 +46,17 @@ uxn_eval(Uxn *u, Uint16 pc)
else sp = &src->ptr;
/* Short Mode */
bs = instr & 0x20;
switch(instr & 0x1f) {
case 0x00:
opcode = instr & 0x1f;
switch(opcode - (!opcode * (instr >> 5))) {
/* Literals/Calls */
if(instr == 0x20) /* JMI */ { PEEK16(a, pc) pc = a; }
else if(instr == 0x40) /* JCI */ { sp = &u->wst->ptr; src = u->wst; POP8(b) if(b) { PEEK16(a, pc) pc = a; } else pc += 2; }
else if(instr == 0x60) /* JSI */ { PUSH16(u->rst, pc + 2) PEEK16(a, pc) pc = a; }
else if(bs) /* LIT2 */ { PEEK16(a, pc) PUSH16(src, a) pc += 2; }
else /* LITr */ { a = u->ram[pc++]; PUSH8(src, a) } break;
case -0x0: /* BRK */ return 1;
case -0x1: /* JMI */ PEEK16(a, pc) pc += a + 2; break;
case -0x2: /* JCI */ sp = &u->wst->ptr; src = u->wst; POP8(b) if(b) { PEEK16(a, pc) pc += a + 2; } else pc += 2; break;
case -0x3: /* JSI */ PUSH16(u->rst, pc + 2) PEEK16(a, pc) pc += a + 2; break;
case -0x4: /* LIT */
case -0x6: /* LITr */ a = u->ram[pc++]; PUSH8(src, a) break;
case -0x5: /* LIT2 */
case -0x7: /* LIT2r */ PEEK16(a, pc) PUSH16(src, a) pc += 2; break;
/* ALU */
case 0x01: /* INC */ POP(a) PUSH(src, a + 1) break;
case 0x02: /* POP */ POP(a) break;
@ -87,7 +91,6 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x1f: /* SFT */ POP8(a) POP(b) PUSH(src, b >> (a & 0x0f) << ((a & 0xf0) >> 4)) break;
}
}
return 1;
}
int

42
src/uxnasm.c
View File

@ -302,26 +302,26 @@ parse(char *w, FILE *f)
makereference(p.scope, w, p.ptr);
return writebyte(0xff);
case ',': /* literal byte relative */
makereference(p.scope, w, p.ptr);
makereference(p.scope, w, p.ptr + 1);
return writelitbyte(0xff);
case '-': /* raw byte absolute */
makereference(p.scope, w, p.ptr);
return writebyte(0xff);
case '.': /* literal byte zero-page */
makereference(p.scope, w, p.ptr);
makereference(p.scope, w, p.ptr + 1);
return writelitbyte(0xff);
case ':': /* raw short absolute */
case '=':
makereference(p.scope, w, p.ptr);
return writeshort(0xffff, 0);
case ';': /* literal short absolute */
makereference(p.scope, w, p.ptr);
makereference(p.scope, w, p.ptr + 1);
return writeshort(0xffff, 1);
case '!': /* JMI */
makereference(p.scope, w, p.ptr);
makereference(p.scope, w, p.ptr + 1);
return writebyte(0x20) && writeshort(0xffff, 0);
case '?': /* JCI */
makereference(p.scope, w, p.ptr);
makereference(p.scope, w, p.ptr + 1);
return writebyte(0x40) && writeshort(0xffff, 0);
case '"': /* raw string */
i = 0;
@ -348,7 +348,7 @@ parse(char *w, FILE *f)
return 0;
return 1;
} else {
makereference(p.scope, w - 1, p.ptr);
makereference(p.scope, w - 1, p.ptr + 1);
return writebyte(0x60) && writeshort(0xffff, 0);
}
}
@ -360,10 +360,12 @@ resolve(void)
{
Label *l;
int i;
Uint16 a;
for(i = 0; i < p.rlen; i++) {
Reference *r = &p.refs[i];
switch(r->rune) {
case '_':
case ',':
if(!(l = findlabel(r->name)))
return error("Unknown relative reference", r->name);
p.data[r->addr] = (Sint8)(l->addr - r->addr - 2);
@ -371,39 +373,30 @@ resolve(void)
return error("Relative reference is too far", r->name);
l->refs++;
break;
case ',':
if(!(l = findlabel(r->name)))
return error("Unknown relative reference", r->name);
p.data[r->addr + 1] = (Sint8)(l->addr - r->addr - 3);
if((Sint8)p.data[r->addr + 1] != (l->addr - r->addr - 3))
return error("Relative reference is too far", r->name);
l->refs++;
break;
case '-':
if(!(l = findlabel(r->name)))
return error("Unknown absolute reference", r->name);
p.data[r->addr] = l->addr & 0xff;
l->refs++;
break;
case '.':
if(!(l = findlabel(r->name)))
return error("Unknown zero-page reference", r->name);
p.data[r->addr + 1] = l->addr & 0xff;
p.data[r->addr] = l->addr & 0xff;
l->refs++;
break;
case ':':
case '=':
case ';':
if(!(l = findlabel(r->name)))
return error("Unknown absolute reference", r->name);
p.data[r->addr] = l->addr >> 0x8;
p.data[r->addr + 1] = l->addr & 0xff;
l->refs++;
break;
case '?':
case '!':
default:
if(!(l = findlabel(r->name)))
return error("Unknown absolute reference", r->name);
p.data[r->addr + 1] = l->addr >> 0x8;
p.data[r->addr + 2] = l->addr & 0xff;
a = l->addr - r->addr - 2;
p.data[r->addr] = a >> 0x8;
p.data[r->addr + 1] = a & 0xff;
l->refs++;
break;
}
@ -451,8 +444,9 @@ writesym(char *filename)
fp = fopen(scat(scpy(filename, symdst, slen(filename) + 1), ".sym"), "w");
if(fp != NULL) {
for(i = 0; i < p.llen; i++) {
fwrite(&p.labels[i].addr + 1, 1, 1, fp);
fwrite((Uint8*)&p.labels[i].addr, 1, 1, fp);
Uint8 hb = p.labels[i].addr >> 8, lb = p.labels[i].addr & 0xff;
fwrite(&hb, 1, 1, fp);
fwrite(&lb, 1, 1, fp);
fwrite(p.labels[i].name, slen(p.labels[i].name) + 1, 1, fp);
}
}