2022-03-26 21:32:46 -04:00
|
|
|
#include "uxn.h"
|
|
|
|
|
|
|
|
/*
|
2023-01-02 16:32:13 -05:00
|
|
|
Copyright (u) 2022-2023 Devine Lu Linvega, Andrew Alderwick, Andrew Richards
|
2022-03-26 21:32:46 -04:00
|
|
|
|
|
|
|
Permission to use, copy, modify, and distribute this software for any
|
|
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
|
|
WITH REGARD TO THIS SOFTWARE.
|
|
|
|
*/
|
|
|
|
|
2023-03-01 11:57:17 -05:00
|
|
|
/* a,b,c: general use. m2: byte/short mode flag.
|
|
|
|
tsp: macro temp stack ptr. ksp: "keep" mode copy of stack ptr. sp: ptr to stack ptr.
|
|
|
|
x,y: macro in params. o: macro out param. */
|
2023-01-01 19:23:21 -05:00
|
|
|
|
|
|
|
#define HALT(c) { return uxn_halt(u, instr, (c), pc - 1); }
|
2023-03-01 11:57:17 -05:00
|
|
|
#define JUMP(x) { if(m2) pc = (x); else pc += (Sint8)(x); }
|
|
|
|
|
|
|
|
#define PUSH8(x) { if(s->ptr == 0xff) HALT(2) s->dat[s->ptr++] = (x); }
|
|
|
|
#define PUSH16(x) { if((tsp = s->ptr) >= 0xfe) HALT(2) t = (x); s->dat[tsp] = t >> 8; s->dat[tsp + 1] = t; s->ptr = tsp + 2; }
|
|
|
|
#define PUSH(x) { if(m2) { PUSH16(x) } else { PUSH8(x) } }
|
|
|
|
|
|
|
|
#define POP8(o) { if(*sp == 0x00) HALT(1) o = s->dat[--*sp]; }
|
|
|
|
#define POP16(o) { if((tsp = *sp) <= 0x01) HALT(1) o = s->dat[tsp - 1] | (s->dat[tsp - 2] << 8); *sp = tsp - 2; }
|
|
|
|
#define POP(o) { if(m2) { POP16(o) } else { POP8(o) } }
|
|
|
|
|
|
|
|
#define POKE(x, y) { if(m2) { t = (y); u->ram[(x)] = t >> 8; u->ram[(x) + 1] = t; } else { u->ram[(x)] = (y); } }
|
|
|
|
#define PEEK16(o, x) { o = (u->ram[(x)] << 8) | u->ram[(x) + 1]; }
|
|
|
|
#define PEEK(o, x) { if(m2) PEEK16(o, x) else o = u->ram[(x)]; }
|
|
|
|
|
|
|
|
#define DEVR(o, x) { o = u->dei(u, x); if(m2) o = (o << 8) | u->dei(u, (x) + 1); }
|
|
|
|
#define DEVW(x, y) { if(m2) { u->deo(u, (x), (y) >> 8); u->deo(u, (x) + 1, (y)); } else { u->deo(u, x, (y)); } }
|
2022-03-26 21:32:46 -04:00
|
|
|
|
|
|
|
int
|
|
|
|
uxn_eval(Uxn *u, Uint16 pc)
|
|
|
|
{
|
2023-03-01 11:57:17 -05:00
|
|
|
Uint8 instr, opcode, m2, ksp, tsp, *sp;
|
|
|
|
Uint16 a, b, c, t;
|
|
|
|
Stack *s;
|
2022-04-05 14:42:50 -04:00
|
|
|
if(!pc || u->dev[0x0f]) return 0;
|
2023-01-12 12:34:45 -05:00
|
|
|
for(;;) {
|
|
|
|
instr = u->ram[pc++];
|
2023-03-01 11:57:17 -05:00
|
|
|
opcode = instr & 0x1f;
|
|
|
|
/* Short Mode */
|
|
|
|
m2 = instr & 0x20;
|
2022-03-26 21:32:46 -04:00
|
|
|
/* Return Mode */
|
2023-03-01 11:57:17 -05:00
|
|
|
s = instr & 0x40 ? u->rst : u->wst;
|
2022-03-26 21:32:46 -04:00
|
|
|
/* Keep Mode */
|
2023-03-01 11:57:17 -05:00
|
|
|
if(instr & 0x80) { ksp = s->ptr; sp = &ksp; }
|
|
|
|
else sp = &s->ptr;
|
|
|
|
/* Opcodes */
|
2023-01-12 12:34:45 -05:00
|
|
|
switch(opcode - (!opcode * (instr >> 5))) {
|
2023-03-01 11:57:17 -05:00
|
|
|
/* Immediate */
|
2023-01-12 12:34:45 -05:00
|
|
|
case -0x0: /* BRK */ return 1;
|
2023-01-12 12:45:19 -05:00
|
|
|
case -0x1: /* JCI */ POP8(b) if(!b) { pc += 2; break; }
|
|
|
|
case -0x2: /* JMI */ PEEK16(a, pc) pc += a + 2; break;
|
2023-03-01 11:57:17 -05:00
|
|
|
case -0x3: /* JSI */ s = u->rst; PUSH16(pc + 2) PEEK16(a, pc) pc += a + 2; break;
|
2023-01-12 12:34:45 -05:00
|
|
|
case -0x4: /* LIT */
|
2023-03-01 11:57:17 -05:00
|
|
|
case -0x6: /* LITr */ a = u->ram[pc++]; PUSH8(a) break;
|
2023-01-12 12:34:45 -05:00
|
|
|
case -0x5: /* LIT2 */
|
2023-03-01 11:57:17 -05:00
|
|
|
case -0x7: /* LIT2r */ PEEK16(a, pc) PUSH16(a) pc += 2; break;
|
2023-01-02 16:32:13 -05:00
|
|
|
/* ALU */
|
2023-03-01 11:57:17 -05:00
|
|
|
case 0x01: /* INC */ POP(a) PUSH(a + 1) break;
|
2022-03-26 21:32:46 -04:00
|
|
|
case 0x02: /* POP */ POP(a) break;
|
2023-03-01 11:57:17 -05:00
|
|
|
case 0x03: /* NIP */ POP(a) POP(b) PUSH(a) break;
|
|
|
|
case 0x04: /* SWP */ POP(a) POP(b) PUSH(a) PUSH(b) break;
|
|
|
|
case 0x05: /* ROT */ POP(a) POP(b) POP(c) PUSH(b) PUSH(a) PUSH(c) break;
|
|
|
|
case 0x06: /* DUP */ POP(a) PUSH(a) PUSH(a) break;
|
|
|
|
case 0x07: /* OVR */ POP(a) POP(b) PUSH(b) PUSH(a) PUSH(b) break;
|
|
|
|
case 0x08: /* EQU */ POP(a) POP(b) PUSH8(b == a) break;
|
|
|
|
case 0x09: /* NEQ */ POP(a) POP(b) PUSH8(b != a) break;
|
|
|
|
case 0x0a: /* GTH */ POP(a) POP(b) PUSH8(b > a) break;
|
|
|
|
case 0x0b: /* LTH */ POP(a) POP(b) PUSH8(b < a) break;
|
2022-04-07 12:33:52 -04:00
|
|
|
case 0x0c: /* JMP */ POP(a) JUMP(a) break;
|
|
|
|
case 0x0d: /* JCN */ POP(a) POP8(b) if(b) JUMP(a) break;
|
2023-03-01 11:57:17 -05:00
|
|
|
case 0x0e: /* JSR */ POP(a) s = (instr & 0x40) ? u->wst : u->rst; PUSH16(pc) JUMP(a) break;
|
|
|
|
case 0x0f: /* STH */ POP(a) s = (instr & 0x40) ? u->wst : u->rst; PUSH(a) break;
|
|
|
|
case 0x10: /* LDZ */ POP8(a) PEEK(b, a) PUSH(b) break;
|
2022-03-26 21:32:46 -04:00
|
|
|
case 0x11: /* STZ */ POP8(a) POP(b) POKE(a, b) break;
|
2023-03-01 11:57:17 -05:00
|
|
|
case 0x12: /* LDR */ POP8(a) PEEK(b, pc + (Sint8)a) PUSH(b) break;
|
|
|
|
case 0x13: /* STR */ POP8(a) POP(b) POKE(pc + (Sint8)a, b) break;
|
|
|
|
case 0x14: /* LDA */ POP16(a) PEEK(b, a) PUSH(b) break;
|
2022-03-26 21:32:46 -04:00
|
|
|
case 0x15: /* STA */ POP16(a) POP(b) POKE(a, b) break;
|
2023-03-01 11:57:17 -05:00
|
|
|
case 0x16: /* DEI */ POP8(a) DEVR(b, a) PUSH(b) break;
|
2022-04-04 22:57:44 -04:00
|
|
|
case 0x17: /* DEO */ POP8(a) POP(b) DEVW(a, b) break;
|
2023-03-01 11:57:17 -05:00
|
|
|
case 0x18: /* ADD */ POP(a) POP(b) PUSH(b + a) break;
|
|
|
|
case 0x19: /* SUB */ POP(a) POP(b) PUSH(b - a) break;
|
|
|
|
case 0x1a: /* MUL */ POP(a) POP(b) PUSH((Uint32)b * a) break;
|
|
|
|
case 0x1b: /* DIV */ POP(a) POP(b) if(!a) HALT(3) PUSH(b / a) break;
|
|
|
|
case 0x1c: /* AND */ POP(a) POP(b) PUSH(b & a) break;
|
|
|
|
case 0x1d: /* ORA */ POP(a) POP(b) PUSH(b | a) break;
|
|
|
|
case 0x1e: /* EOR */ POP(a) POP(b) PUSH(b ^ a) break;
|
|
|
|
case 0x1f: /* SFT */ POP8(a) POP(b) PUSH(b >> (a & 0x0f) << ((a & 0xf0) >> 4)) break;
|
2022-03-26 21:32:46 -04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2023-01-01 19:23:21 -05:00
|
|
|
uxn_boot(Uxn *u, Uint8 *ram, Dei *dei, Deo *deo)
|
2022-03-26 21:32:46 -04:00
|
|
|
{
|
|
|
|
Uint32 i;
|
|
|
|
char *cptr = (char *)u;
|
|
|
|
for(i = 0; i < sizeof(*u); i++)
|
|
|
|
cptr[i] = 0x00;
|
2023-02-02 12:34:14 -05:00
|
|
|
u->wst = (Stack *)(ram + 0xf0000);
|
|
|
|
u->rst = (Stack *)(ram + 0xf0100);
|
|
|
|
u->dev = (Uint8 *)(ram + 0xf0200);
|
2023-01-01 19:23:21 -05:00
|
|
|
u->ram = ram;
|
2022-06-13 14:59:42 -04:00
|
|
|
u->dei = dei;
|
|
|
|
u->deo = deo;
|
2022-03-26 21:32:46 -04:00
|
|
|
return 1;
|
|
|
|
}
|