(ref) Basic implementation

.clang-format

@@ -0,0 +1,21 @@
+AlignAfterOpenBracket: DontAlign
+AlignEscapedNewlines: DontAlign
+AlignOperands: DontAlign
+AllowShortBlocksOnASingleLine: Always
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortEnumsOnASingleLine: true
+AllowShortIfStatementsOnASingleLine: true
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakAfterDefinitionReturnType: TopLevel
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBraces: WebKit
+IndentCaseLabels: false
+TabWidth: 4
+IndentWidth: 4
+ContinuationIndentWidth: 4
+UseTab: ForContinuationAndIndentation
+ColumnLimit: 0
+ReflowComments: false
+SortIncludes: false
+SpaceBeforeParens: false

.gitignore

@@ -2,7 +2,7 @@
 *jpg
 *png
 *bmp
-/bin
+*/bin
 *snarf
 *notepad
 *theme
@@ -10,3 +10,4 @@
 *rom
 *sym
 
+

ref/makefile

@@ -0,0 +1,16 @@
+.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

ref/uxn.c

@@ -0,0 +1,226 @@
+#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;
+}