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Use HALT macro

This commit is contained in:
Devine Lu Linvega 2023-01-01 16:23:21 -08:00
parent 730440b07c
commit deaf17c3e7
1 changed files with 18 additions and 27 deletions
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45
src/uxn.c
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@ -13,15 +13,19 @@ WITH REGARD TO THIS SOFTWARE.
/* clang-format off */
#define PUSH8(s, x) { if(s->ptr == 0xff) { errcode = 2; goto err; } s->dat[s->ptr++] = (x); }
#define PUSH16(s, x) { if((j = s->ptr) >= 0xfe) { errcode = 2; goto err; } k = (x); s->dat[j] = k >> 8; s->dat[j + 1] = k; s->ptr = j + 2; }
/* a,b,c: general use. bs: byte/short bool. src, dst: stack ptrs, swapped in return mode.
pc: program counter. sp: ptr to src stack ptr. kptr: "keep" mode copy of src stack ptr.
x,y: macro in params. d: macro in device. j,k,dev: macro temp variables. o: macro out param. */
#define HALT(c) { return uxn_halt(u, instr, (c), pc - 1); }
#define PUSH8(s, x) { if(s->ptr == 0xff) HALT(2) s->dat[s->ptr++] = (x); }
#define PUSH16(s, x) { if((j = s->ptr) >= 0xfe) HALT(2) k = (x); s->dat[j] = k >> 8; s->dat[j + 1] = k; s->ptr = j + 2; }
#define PUSH(s, x) { if(bs) { PUSH16(s, (x)) } else { PUSH8(s, (x)) } }
#define POP8(o) { if(!(j = *sp)) { errcode = 1; goto err; } o = (Uint16)src->dat[--j]; *sp = j; }
#define POP16(o) { if((j = *sp) <= 1) { errcode = 1; goto err; } o = src->dat[j - 1]; o += src->dat[j - 2] << 8; *sp = j - 2; }
#define POP8(o) { if(!(j = *sp)) HALT(1) o = (Uint16)src->dat[--j]; *sp = j; }
#define POP16(o) { if((j = *sp) <= 1) HALT(1) o = src->dat[j - 1]; o += src->dat[j - 2] << 8; *sp = j - 2; }
#define POP(o) { if(bs) { POP16(o) } else { POP8(o) } }
#define POKE(x, y) { if(bs) { u->ram[(x)] = (y) >> 8; u->ram[(x) + 1] = (y); } else { u->ram[(x)] = y; } }
#define PEEK16(o, x) { o = (u->ram[(x)] << 8) + u->ram[(x) + 1]; }
#define PEEK(o, x) { if(bs) { PEEK16(o, x) } else { o = u->ram[(x)]; } }
#define PEEK(o, x) { if(bs) { o = (u->ram[(x)] << 8) + u->ram[(x) + 1]; } else { o = u->ram[(x)]; } }
#define DEVR(o, x) { o = u->dei(u, x); if (bs) o = (o << 8) + u->dei(u, ((x) + 1) & 0xFF); }
#define DEVW(x, y) { if (bs) { u->deo(u, (x), (y) >> 8); u->deo(u, ((x) + 1) & 0xFF, (y)); } else { u->deo(u, x, (y)); } }
#define JUMP(x) { if(bs) pc = (x); else pc += (Sint8)(x); }
@ -29,28 +33,20 @@ WITH REGARD TO THIS SOFTWARE.
int
uxn_eval(Uxn *u, Uint16 pc)
{
unsigned int a, b, c, j, k, bs, instr, errcode;
unsigned int a, b, c, j, k, bs, instr;
Uint8 kptr, *sp;
Stack *src, *dst;
if(!pc || u->dev[0x0f]) return 0;
while((instr = u->ram[pc++])) {
/* Return Mode */
if(instr & 0x40) {
src = u->rst; dst = u->wst;
} else {
src = u->wst; dst = u->rst;
}
if(instr & 0x40) { src = u->rst; dst = u->wst; }
else { src = u->wst; dst = u->rst; }
/* Keep Mode */
if(instr & 0x80) {
kptr = src->ptr;
sp = &kptr;
} else {
sp = &src->ptr;
}
if(instr & 0x80) { kptr = src->ptr; sp = &kptr; }
else sp = &src->ptr;
/* Short Mode */
bs = instr & 0x20 ? 1 : 0;
switch(instr & 0x1f) {
/* Stack */
case 0x00: /* LIT */ PEEK(a, pc) PUSH(src, a) pc += 1 + bs; break;
case 0x01: /* INC */ POP(a) PUSH(src, a + 1) break;
case 0x02: /* POP */ POP(a) break;
@ -59,7 +55,6 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x05: /* ROT */ POP(a) POP(b) POP(c) PUSH(src, b) PUSH(src, a) PUSH(src, c) break;
case 0x06: /* DUP */ POP(a) PUSH(src, a) PUSH(src, a) break;
case 0x07: /* OVR */ POP(a) POP(b) PUSH(src, b) PUSH(src, a) PUSH(src, b) break;
/* Logic */
case 0x08: /* EQU */ POP(a) POP(b) PUSH8(src, b == a) break;
case 0x09: /* NEQ */ POP(a) POP(b) PUSH8(src, b != a) break;
case 0x0a: /* GTH */ POP(a) POP(b) PUSH8(src, b > a) break;
@ -68,7 +63,6 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x0d: /* JCN */ POP(a) POP8(b) if(b) JUMP(a) break;
case 0x0e: /* JSR */ POP(a) PUSH16(dst, pc) JUMP(a) break;
case 0x0f: /* STH */ POP(a) PUSH(dst, a) break;
/* Memory */
case 0x10: /* LDZ */ POP8(a) PEEK(b, a) PUSH(src, b) break;
case 0x11: /* STZ */ POP8(a) POP(b) POKE(a, b) break;
case 0x12: /* LDR */ POP8(a) PEEK(b, pc + (Sint8)a) PUSH(src, b) break;
@ -77,11 +71,10 @@ uxn_eval(Uxn *u, Uint16 pc)
case 0x15: /* STA */ POP16(a) POP(b) POKE(a, b) break;
case 0x16: /* DEI */ POP8(a) DEVR(b, a) PUSH(src, b) break;
case 0x17: /* DEO */ POP8(a) POP(b) DEVW(a, b) break;
/* Arithmetic */
case 0x18: /* ADD */ POP(a) POP(b) PUSH(src, b + a) break;
case 0x19: /* SUB */ POP(a) POP(b) PUSH(src, b - a) break;
case 0x1a: /* MUL */ POP(a) POP(b) PUSH(src, (Uint32)b * a) break;
case 0x1b: /* DIV */ POP(a) POP(b) if(a == 0) { errcode = 3; goto err; } PUSH(src, b / a) break;
case 0x1b: /* DIV */ POP(a) POP(b) if(a == 0) HALT(3) PUSH(src, b / a) break;
case 0x1c: /* AND */ POP(a) POP(b) PUSH(src, b & a) break;
case 0x1d: /* ORA */ POP(a) POP(b) PUSH(src, b | a) break;
case 0x1e: /* EOR */ POP(a) POP(b) PUSH(src, b ^ a) break;
@ -89,23 +82,21 @@ uxn_eval(Uxn *u, Uint16 pc)
}
}
return 1;
err:
return uxn_halt(u, instr, errcode, pc - 1);
}
/* clang-format on */
int
uxn_boot(Uxn *u, Uint8 *ram, Uint8 (*dei)(struct Uxn *, Uint8), void (*deo)(struct Uxn *, Uint8, Uint8))
uxn_boot(Uxn *u, Uint8 *ram, Dei *dei, Deo *deo)
{
Uint32 i;
char *cptr = (char *)u;
for(i = 0; i < sizeof(*u); i++)
cptr[i] = 0x00;
u->ram = ram;
u->wst = (Stack *)(ram + 0x10000);
u->rst = (Stack *)(ram + 0x10100);
u->dev = (Uint8 *)(ram + 0x10200);
u->ram = ram;
u->dei = dei;
u->deo = deo;
return 1;