213 lines
9.6 KiB
C
213 lines
9.6 KiB
C
#include <stdio.h>
|
|
|
|
/*
|
|
Copyright (u) 2021 Devine Lu Linvega
|
|
|
|
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.
|
|
*/
|
|
|
|
#include "uxn.h"
|
|
|
|
#pragma mark - Operations
|
|
|
|
/* clang-format off */
|
|
|
|
void setflag(Uint8 *a, char flag, int b) { if(b) *a |= flag; else *a &= (~flag); }
|
|
int getflag(Uint8 *a, char flag) { return *a & flag; }
|
|
void mempoke8(Memory *m, Uint16 a, Uint8 b) { m->dat[a] = b; }
|
|
Uint8 mempeek8(Memory *m, Uint16 a) { return m->dat[a]; }
|
|
void mempoke16(Memory *m, Uint16 a, Uint16 b) { mempoke8(m, a, b >> 8); mempoke8(m, a + 1, b); }
|
|
Uint16 mempeek16(Memory *m, Uint16 a) { return (mempeek8(m, a) << 8) + mempeek8(m, a + 1); }
|
|
void push8(St8 *s, Uint8 a) { s->dat[s->ptr++] = a; }
|
|
Uint8 pop8(St8 *s) { return s->dat[--s->ptr]; }
|
|
Uint8 peek8(St8 *s, Uint8 a) { return s->dat[s->ptr - a - 1]; }
|
|
void push16(St8 *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }
|
|
Uint16 pop16(St8 *s) { return pop8(s) + (pop8(s) << 8); }
|
|
Uint16 peek16(St8 *s, Uint8 a) { return peek8(s, a * 2) + (peek8(s, a * 2 + 1) << 8); }
|
|
/* I/O */
|
|
void op_brk(Uxn *u) { setflag(&u->status,FLAG_HALT, 1); }
|
|
void op_li1(Uxn *u) { u->literal += 1; }
|
|
void op_lix(Uxn *u) { u->literal += u->ram.dat[u->ram.ptr++]; }
|
|
void op_nop(Uxn *u) { printf("0x%02x ", pop8(&u->wst)); }
|
|
void op_ior(Uxn *u) { Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push8(&u->wst, dev->read(dev, pop8(&u->wst))); }
|
|
void op_iow(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) dev->write(dev, a); }
|
|
void op_ldr(Uxn *u) { Uint16 a = pop16(&u->wst); push8(&u->wst, mempeek8(&u->ram, a)); }
|
|
void op_str(Uxn *u) { Uint16 a = pop16(&u->wst); Uint8 b = pop8(&u->wst); mempoke8(&u->ram, a, b); }
|
|
/* Logic */
|
|
void op_jmp(Uxn *u) { u->ram.ptr = pop16(&u->wst); }
|
|
void op_jsr(Uxn *u) { push16(&u->rst, u->ram.ptr); u->ram.ptr = pop16(&u->wst); }
|
|
void op_rts(Uxn *u) { u->ram.ptr = pop16(&u->rst); }
|
|
/* Stack */
|
|
void op_pop(Uxn *u) { pop8(&u->wst); }
|
|
void op_dup(Uxn *u) { push8(&u->wst, peek8(&u->wst, 0)); }
|
|
void op_swp(Uxn *u) { Uint8 b = pop8(&u->wst), a = pop8(&u->wst); push8(&u->wst, b); push8(&u->wst, a); }
|
|
void op_ovr(Uxn *u) { push8(&u->wst, peek8(&u->wst, 1)); }
|
|
void op_rot(Uxn *u) { Uint8 c = pop8(&u->wst), b = pop8(&u->wst), a = pop8(&u->wst); push8(&u->wst, b); push8(&u->wst, c); push8(&u->wst, a); }
|
|
void op_and(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b & a); }
|
|
void op_ora(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b | a); }
|
|
void op_rol(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, b << a); }
|
|
/* Arithmetic */
|
|
void op_add(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b + (Sint8)a : b + a); }
|
|
void op_sub(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b - (Sint8)a : b - a); }
|
|
void op_mul(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b * (Sint8)a : b * a); }
|
|
void op_div(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b / (Sint8)a : b / a); }
|
|
void op_equ(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b == (Sint8)a : b == a); }
|
|
void op_neq(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b != (Sint8)a : b != a); }
|
|
void op_gth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b > (Sint8)a : b > a); }
|
|
void op_lth(Uxn *u) { Uint8 a = pop8(&u->wst), b = pop8(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint8)b < (Sint8)a : b < a); }
|
|
/* --- */
|
|
void op_nop16(Uxn *u) { printf("%04x\n", pop16(&u->wst)); }
|
|
void op_ior16(Uxn *u) { Uint8 a = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devr)]; if(dev) push16(&u->wst, (dev->read(dev, a) << 8) + dev->read(dev, a + 1)); }
|
|
void op_iow16(Uxn *u) { Uint8 a = pop8(&u->wst); Uint8 b = pop8(&u->wst); Device *dev = &u->dev[mempeek8(&u->ram, u->devw)]; if(dev) { dev->write(dev, b); dev->write(dev, a); } }
|
|
void op_ldr16(Uxn *u) { Uint16 a = pop16(&u->wst); push16(&u->wst, mempeek16(&u->ram, a)); }
|
|
void op_str16(Uxn *u) { Uint16 a = pop16(&u->wst); Uint16 b = pop16(&u->wst); mempoke16(&u->ram, a, b); }
|
|
/* Stack(16-bits) */
|
|
void op_pop16(Uxn *u) { pop16(&u->wst); }
|
|
void op_dup16(Uxn *u) { push16(&u->wst, peek16(&u->wst, 0)); }
|
|
void op_swp16(Uxn *u) { Uint16 b = pop16(&u->wst), a = pop16(&u->wst); push16(&u->wst, b); push16(&u->wst, a); }
|
|
void op_ovr16(Uxn *u) { push16(&u->wst, peek16(&u->wst, 1)); }
|
|
void op_rot16(Uxn *u) { Uint16 c = pop16(&u->wst), b = pop16(&u->wst), a = pop16(&u->wst); push16(&u->wst, b); push16(&u->wst, c); push16(&u->wst, a); }
|
|
void op_and16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b & a); }
|
|
void op_ora16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b | a); }
|
|
void op_rol16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, b << a); }
|
|
/* Arithmetic(16-bits) */
|
|
void op_add16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b + (Sint16)a : b + a); }
|
|
void op_sub16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b - (Sint16)a : b - a); }
|
|
void op_mul16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b * (Sint16)a : b * a); }
|
|
void op_div16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push16(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b / (Sint16)a : b / a); }
|
|
void op_equ16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b == (Sint16)a : b == a); }
|
|
void op_neq16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b != (Sint16)a : b != a); }
|
|
void op_gth16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b > (Sint16)a : b > a); }
|
|
void op_lth16(Uxn *u) { Uint16 a = pop16(&u->wst), b = pop16(&u->wst); push8(&u->wst, getflag(&u->status, FLAG_SIGN) ? (Sint16)b < (Sint16)a : b < a); }
|
|
|
|
void (*ops[])(Uxn *u) = {
|
|
op_brk, op_nop, op_li1, op_lix, op_ior, op_iow, op_ldr, op_str,
|
|
op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
|
|
op_pop, op_dup, op_swp, op_ovr, op_rot, op_and, op_ora, op_rol,
|
|
op_add, op_sub, op_mul, op_div, op_equ, op_neq, op_gth, op_lth,
|
|
/* 16-bit */
|
|
op_brk, op_nop16, op_li1, op_lix, op_ior16, op_iow16, op_ldr16, op_str16,
|
|
op_jmp, op_jsr, op_nop, op_rts, op_nop, op_nop, op_nop, op_nop,
|
|
op_pop16, op_dup16, op_swp16, op_ovr16, op_rot16, op_and16, op_ora16, op_rol16,
|
|
op_add16, op_sub16, op_mul16, op_div16, op_equ16, op_neq16, op_gth16, op_lth16
|
|
};
|
|
|
|
Uint8 opr[][2] = {
|
|
{0,0}, {0,0}, {0,0}, {0,0}, {1,1}, {1,0}, {2,1}, {3,0},
|
|
{2,0}, {2,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0},
|
|
{1,0}, {1,2}, {2,2}, {2,3}, {3,3}, {2,1}, {2,1}, {2,1},
|
|
{2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1},
|
|
/* 16-bit */
|
|
{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
|
|
{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
|
|
{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
|
|
{4,2}, {4,2}, {4,2}, {4,2}, {4,2}, {4,2}, {4,2}, {4,2}
|
|
};
|
|
|
|
/* clang-format on */
|
|
|
|
int
|
|
haltuxn(Uxn *u, char *name, int id)
|
|
{
|
|
printf("Error: %s#%04x, at 0x%04x\n", name, id, u->counter);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
lituxn(Uxn *u, Uint8 instr)
|
|
{
|
|
if(u->wst.ptr >= 255)
|
|
return haltuxn(u, "Stack overflow", instr);
|
|
push8(&u->wst, instr);
|
|
u->literal--;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
opcuxn(Uxn *u, Uint8 instr)
|
|
{
|
|
Uint8 op = instr & 0x1f;
|
|
setflag(&u->status, FLAG_SHORT, (instr >> 5) & 1);
|
|
setflag(&u->status, FLAG_SIGN, (instr >> 6) & 1);
|
|
setflag(&u->status, FLAG_COND, (instr >> 7) & 1);
|
|
if(getflag(&u->status, FLAG_SHORT))
|
|
op += 32;
|
|
if(u->wst.ptr < opr[op][0])
|
|
return haltuxn(u, "Stack underflow", op);
|
|
if(u->wst.ptr + opr[op][1] - opr[op][0] >= 255)
|
|
return haltuxn(u, "Stack overflow", instr);
|
|
if(!getflag(&u->status, FLAG_COND) || (getflag(&u->status, FLAG_COND) && pop8(&u->wst)))
|
|
(*ops[op])(u);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
stepuxn(Uxn *u, Uint8 instr)
|
|
{
|
|
if(u->literal > 0)
|
|
return lituxn(u, instr);
|
|
else
|
|
return opcuxn(u, instr);
|
|
}
|
|
|
|
int
|
|
evaluxn(Uxn *u, Uint16 vec)
|
|
{
|
|
u->literal = 0;
|
|
u->ram.ptr = vec;
|
|
setflag(&u->status, FLAG_HALT, 0);
|
|
while(!(u->status & FLAG_HALT)) {
|
|
Uint8 instr = u->ram.dat[u->ram.ptr++];
|
|
if(!stepuxn(u, instr))
|
|
return 0;
|
|
u->counter++;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
bootuxn(Uxn *u)
|
|
{
|
|
size_t i;
|
|
char *cptr = (char *)&u;
|
|
for(i = 0; i < sizeof u; i++)
|
|
cptr[i] = 0;
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
loaduxn(Uxn *u, char *filepath)
|
|
{
|
|
FILE *f;
|
|
if(!(f = fopen(filepath, "rb")))
|
|
return haltuxn(u, "Missing input.", 0);
|
|
fread(u->ram.dat, sizeof(u->ram.dat), 1, f);
|
|
u->devr = 0xfff8;
|
|
u->devw = 0xfff9;
|
|
u->vreset = mempeek16(&u->ram, 0xfffa);
|
|
u->vframe = mempeek16(&u->ram, 0xfffc);
|
|
u->verror = mempeek16(&u->ram, 0xfffe);
|
|
printf("Uxn loaded[%s] vrst:%04x vfrm:%04x verr:%04x.\n",
|
|
filepath,
|
|
u->vreset,
|
|
u->vframe,
|
|
u->verror);
|
|
return 1;
|
|
}
|
|
|
|
Device *
|
|
portuxn(Uxn *u, char *name, Uint8 (*rfn)(Device *, Uint8), Uint8 (*wfn)(Device *, Uint8))
|
|
{
|
|
Device *d = &u->dev[u->devices++];
|
|
d->read = rfn;
|
|
d->write = wfn;
|
|
d->len = 0;
|
|
printf("Device #%d: %s \n", u->devices - 1, name);
|
|
return d;
|
|
}
|