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(ref) Basic implementation

This commit is contained in:
Devine Lu Linvega 2024-01-10 12:33:12 -08:00
parent 1203728d65
commit 6deb08adcd
6 changed files with 265 additions and 1 deletions
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*jpg
*png
*bmp
/bin
*/bin
*snarf
*notepad
*theme
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*rom
*sym

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.PHONY: all run format clean
all: bin/uxn
run: all
@ bin/uxn test.bin
format:
@ clang-format -i uxn.c
clean:
@ rm -r -f bin
bin/uxn: uxn.c
@ mkdir -p bin/
@ cc uxn.c -o bin/uxn

BIN
ref/test.bin Normal file
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BIN
ref/uxn Executable file
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#include <stdio.h>
#include <stdlib.h>
/* clang-format off */
#define PEEK2(d) (*(d) << 8 | (d)[1])
#define POKE2(d, v) { *(d) = (v) >> 8; (d)[1] = (v); }
#define CONSOLE_STD 0x1
#define CONSOLE_ARG 0x2
#define CONSOLE_EOA 0x3
#define CONSOLE_END 0x4
#define PAGE_PROGRAM 0x0100
#define RAM_PAGES 0x10
/* clang-format on */
typedef unsigned char Uint8;
typedef signed char Sint8;
typedef unsigned short Uint16;
typedef signed short Sint16;
typedef unsigned int Uint32;
typedef struct {
Uint8 dat[0x100], ptr;
} Stack;
typedef struct Uxn {
Uint8 *ram, dev[0x100];
Stack wst, rst;
} Uxn;
int uxn_eval(Uxn *u, Uint16 pc);
int
system_error(char *msg, const char *err)
{
fprintf(stderr, "%s %s\n", msg, err);
fflush(stderr);
return 0;
}
static void
system_zero(Uxn *u, int soft)
{
int i;
for(i = PAGE_PROGRAM * soft; i < 0x10000; i++)
u->ram[i] = 0;
for(i = 0x0; i < 0x100; i++)
u->dev[i] = 0;
u->wst.ptr = u->rst.ptr = 0;
}
char *boot_rom;
static int
system_load(Uxn *u, char *filename)
{
int l, i = 0;
FILE *f = fopen(filename, "rb");
if(!f)
return 0;
l = fread(&u->ram[PAGE_PROGRAM], 0x10000 - PAGE_PROGRAM, 1, f);
while(l && ++i < RAM_PAGES)
l = fread(u->ram + 0x10000 * i, 0x10000, 1, f);
fclose(f);
return 1;
}
int
system_init(Uxn *u, Uint8 *ram, char *rom)
{
u->ram = ram;
system_zero(u, 0);
if(!system_load(u, rom))
if(!system_load(u, "boot.rom"))
return system_error("Init", "Failed to load rom.");
boot_rom = rom;
return 1;
}
int
console_input(Uxn *u, char c, int type)
{
Uint8 *d = &u->dev[0x10];
d[0x2] = c;
d[0x7] = type;
return uxn_eval(u, PEEK2(d));
}
void
console_listen(Uxn *u, int i, int argc, char **argv)
{
for(; i < argc; i++) {
char *p = argv[i];
while(*p) console_input(u, *p++, CONSOLE_ARG);
console_input(u, '\n', i == argc - 1 ? CONSOLE_END : CONSOLE_EOA);
}
}
void
console_deo(Uint8 *d, Uint8 port)
{
switch(port) {
case 0x8:
fputc(d[port], stdout);
fflush(stdout);
return;
case 0x9:
fputc(d[port], stderr);
fflush(stderr);
return;
}
}
Uint8
emu_dei(Uxn *u, Uint8 addr)
{
return u->dev[addr];
}
void
emu_deo(Uxn *u, Uint8 addr, Uint8 value)
{
Uint8 p = addr & 0x0f, d = addr & 0xf0;
u->dev[addr] = value;
switch(d) {
case 0x10: console_deo(&u->dev[d], p); break;
}
}
#define FLIP { s = ins & 0x40 ? &u->wst : &u->rst; }
#define JUMP(x) { if(m2) pc = (x); else pc += (Sint8)(x); }
#define POP1(o) { o = s->dat[--*sp]; }
#define POP2(o) { o = s->dat[--*sp] | (s->dat[--*sp] << 0x8); }
#define POPx(o) { if(m2) { POP2(o) } else POP1(o) }
#define PUSH1(y) { s->dat[s->ptr++] = (y); }
#define PUSH2(y) { tt = (y); s->dat[s->ptr++] = tt >> 0x8; s->dat[s->ptr++] = tt; }
#define PUSHx(y) { if(m2) { PUSH2(y) } else PUSH1(y) }
#define PEEK(o, x, r) { if(m2) { r = (x); o = ram[r++] << 8 | ram[r]; } else o = ram[(x)]; }
#define POKE(x, y, r) { if(m2) { r = (x); ram[r++] = y >> 8; ram[r] = y; } else ram[(x)] = (y); }
#define DEVR(o, p) { if(m2) { o = (emu_dei(u, p) << 8) | emu_dei(u, p + 1); } else o = emu_dei(u, p); }
#define DEVW(p, y) { if(m2) { emu_deo(u, p, y >> 8); emu_deo(u, p + 1, y); } else emu_deo(u, p, y); }
int
uxn_eval(Uxn *u, Uint16 pc)
{
Uint8 t, kp, *sp, *ram = u->ram;
Uint16 tt, a, b, c;
if(!pc || u->dev[0x0f]) return 0;
for(;;) {
Uint8 ins = ram[pc++], m2 = ins & 0x20;
Stack *s = ins & 0x40 ? &u->rst : &u->wst;
if(ins & 0x80) kp = s->ptr, sp = &kp;
else sp = &s->ptr;
switch(ins & 0x1f) {
case 0x00: case 0x20:
switch(ins) {
case 0x00: /* BRK */ return 1;
case 0x20: /* JCI */ POP1(b) if(!b) { pc += 2; break; }
case 0x40: /* JMI */ pc += PEEK2(ram + pc) + 2; break;
case 0x60: /* JSI */ PUSH2(pc + 2) pc += PEEK2(ram + pc) + 2; break;
case 0x80: case 0xc0: /* LIT */ PUSH1(ram[pc++]) break;
case 0xa0: case 0xe0: /* LIT2 */ PUSH1(ram[pc++]) PUSH1(ram[pc++]) break;
} break;
case 0x01: /* INC */ POPx(a) PUSHx(a + 1) break;
case 0x02: /* POP */ POPx(a) break;
case 0x03: /* NIP */ POPx(a) POPx(b) PUSHx(a) break;
case 0x04: /* SWP */ POPx(a) POPx(b) PUSHx(a) PUSHx(b) break;
case 0x05: /* ROT */ POPx(a) POPx(b) POPx(c) PUSHx(b) PUSHx(a) PUSHx(c) break;
case 0x06: /* DUP */ POPx(a) PUSHx(a) PUSHx(a) break;
case 0x07: /* OVR */ POPx(a) POPx(b) PUSHx(b) PUSHx(a) PUSHx(b) break;
case 0x08: /* EQU */ POPx(a) POPx(b) PUSH1(b == a) break;
case 0x09: /* NEQ */ POPx(a) POPx(b) PUSH1(b != a) break;
case 0x0a: /* GTH */ POPx(a) POPx(b) PUSH1(b > a) break;
case 0x0b: /* LTH */ POPx(a) POPx(b) PUSH1(b < a) break;
case 0x0c: /* JMP */ POPx(a) JUMP(a) break;
case 0x0d: /* JCN */ POPx(a) POP1(b) if(b) JUMP(a) break;
case 0x0e: /* JSR */ POPx(a) FLIP PUSH2(pc) JUMP(a) break;
case 0x0f: /* STH */ POPx(a) FLIP PUSHx(a) break;
case 0x10: /* LDZ */ POP1(a) PEEK(b, a, t) PUSHx(b) break;
case 0x11: /* STZ */ POP1(a) POPx(b) POKE(a, b, t) break;
case 0x12: /* LDR */ POP1(a) PEEK(b, pc + (Sint8)a, tt) PUSHx(b) break;
case 0x13: /* STR */ POP1(a) POPx(b) POKE(pc + (Sint8)a, b, tt) break;
case 0x14: /* LDA */ POP2(a) PEEK(b, a, tt) PUSHx(b) break;
case 0x15: /* STA */ POP2(a) POPx(b) POKE(a, b, tt) break;
case 0x16: /* DEI */ POP1(a) DEVR(b, a) PUSHx(b) break;
case 0x17: /* DEO */ POP1(a) POPx(b) DEVW(a, b) break;
case 0x18: /* ADD */ POPx(a) POPx(b) PUSHx(b + a) break;
case 0x19: /* SUB */ POPx(a) POPx(b) PUSHx(b - a) break;
case 0x1a: /* MUL */ POPx(a) POPx(b) PUSHx((Uint32)b * a) break;
case 0x1b: /* DIV */ POPx(a) POPx(b) PUSHx(a ? b / a : 0) break;
case 0x1c: /* AND */ POPx(a) POPx(b) PUSHx(b & a) break;
case 0x1d: /* ORA */ POPx(a) POPx(b) PUSHx(b | a) break;
case 0x1e: /* EOR */ POPx(a) POPx(b) PUSHx(b ^ a) break;
case 0x1f: /* SFT */ POP1(a) POPx(b) PUSHx(b >> (a & 0xf) << (a >> 4)) break;
}
}
}
int
main(int argc, char **argv)
{
int i = 1;
Uxn u = {0};
if(i == argc)
return system_error("usage:", "uxncli [-v] file.rom [args..]");
if(argv[i][0] == '-' && argv[i][1] == 'v')
return system_error("Uxncli - Varvara Emulator(CLI)", "4 Jan 2024.");
if(!system_init(&u, (Uint8 *)calloc(0x10000 * RAM_PAGES, sizeof(Uint8)), argv[i++]))
return system_error("Init", "Failed to initialize uxn.");
/* eval */
u.dev[0x17] = argc - i;
if(uxn_eval(&u, 0x0100)) {
console_listen(&u, i, argc, argv);
while(!u.dev[0x0f]) {
char c = fgetc(stdin);
if(c == EOF) {
console_input(&u, 0x00, CONSOLE_END);
break;
}
console_input(&u, (Uint8)c, CONSOLE_STD);
}
}
free(u.ram);
return u.dev[0x0f] & 0x7f;
}